Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

152 files changed, 33820 insertions, 0 deletions

diff --git a/app/operations/Makefile.am b/app/operations/Makefile.am
new file mode 100644
index 0000000..24bfe6d
--- /dev/null
+++ b/app/operations/Makefile.am
@@ -0,0 +1,140 @@
+## Process this file with automake to produce Makefile.in
+
+SUBDIRS = \
+	layer-modes		\
+	layer-modes-legacy	\
+	tests
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-Operations\"	\
+	-I$(top_builddir)			\
+	-I$(top_srcdir)				\
+	-I$(top_builddir)/app			\
+	-I$(top_srcdir)/app			\
+	$(CAIRO_CFLAGS)				\
+	$(GEGL_CFLAGS)				\
+	$(GDK_PIXBUF_CFLAGS)			\
+	-I$(includedir)
+
+noinst_LIBRARIES = \
+	libappoperations.a
+
+libappoperations_a_sources = \
+	operations-types.h			\
+	operations-enums.h			\
+	gimp-operations.c			\
+	gimp-operations.h			\
+	\
+	gimp-operation-config.c			\
+	gimp-operation-config.h			\
+	gimpoperationsettings.c			\
+	gimpoperationsettings.h			\
+	gimpbrightnesscontrastconfig.c		\
+	gimpbrightnesscontrastconfig.h		\
+	gimpcageconfig.c			\
+	gimpcageconfig.h			\
+	gimpcolorbalanceconfig.c		\
+	gimpcolorbalanceconfig.h		\
+	gimpcurvesconfig.c			\
+	gimpcurvesconfig.h			\
+	gimphuesaturationconfig.c		\
+	gimphuesaturationconfig.h		\
+	gimplevelsconfig.c			\
+	gimplevelsconfig.h			\
+	\
+	gimpoperationborder.c			\
+	gimpoperationborder.h			\
+	gimpoperationbuffersourcevalidate.c	\
+	gimpoperationbuffersourcevalidate.h	\
+	gimpoperationcagecoefcalc.c		\
+	gimpoperationcagecoefcalc.h		\
+	gimpoperationcagetransform.c		\
+	gimpoperationcagetransform.h		\
+	gimpoperationcomposecrop.c		\
+	gimpoperationcomposecrop.h		\
+	gimpoperationequalize.c			\
+	gimpoperationequalize.h			\
+	gimpoperationfillsource.c		\
+	gimpoperationfillsource.h		\
+	gimpoperationflood.c			\
+	gimpoperationflood.h			\
+	gimpoperationgradient.c			\
+	gimpoperationgradient.h			\
+	gimpoperationgrow.c			\
+	gimpoperationgrow.h			\
+	gimpoperationhistogramsink.c		\
+	gimpoperationhistogramsink.h		\
+	gimpoperationmaskcomponents.cc		\
+	gimpoperationmaskcomponents.h		\
+	gimpoperationoffset.c			\
+	gimpoperationoffset.h			\
+	gimpoperationprofiletransform.c		\
+	gimpoperationprofiletransform.h		\
+	gimpoperationscalarmultiply.c		\
+	gimpoperationscalarmultiply.h		\
+	gimpoperationsemiflatten.c		\
+	gimpoperationsemiflatten.h		\
+	gimpoperationsetalpha.c			\
+	gimpoperationsetalpha.h			\
+	gimpoperationshrink.c			\
+	gimpoperationshrink.h			\
+	gimpoperationthresholdalpha.c		\
+	gimpoperationthresholdalpha.h		\
+	\
+	gimpoperationpointfilter.c		\
+	gimpoperationpointfilter.h		\
+	gimpoperationbrightnesscontrast.c	\
+	gimpoperationbrightnesscontrast.h	\
+	gimpoperationcolorbalance.c		\
+	gimpoperationcolorbalance.h		\
+	gimpoperationcolorize.c			\
+	gimpoperationcolorize.h			\
+	gimpoperationcurves.c			\
+	gimpoperationcurves.h			\
+	gimpoperationdesaturate.c		\
+	gimpoperationdesaturate.h		\
+	gimpoperationhuesaturation.c		\
+	gimpoperationhuesaturation.h		\
+	gimpoperationlevels.c			\
+	gimpoperationlevels.h			\
+	gimpoperationposterize.c		\
+	gimpoperationposterize.h		\
+	gimpoperationthreshold.c		\
+	gimpoperationthreshold.h
+
+libappoperations_a_built_sources = operations-enums.c
+
+libappoperations_a_SOURCES = \
+	$(libappoperations_a_built_sources)	\
+	$(libappoperations_a_sources)
+
+#
+# rules to generate built sources
+#
+# setup autogeneration dependencies
+gen_sources = xgen-oec
+CLEANFILES = $(gen_sources)
+
+xgen-oec: $(srcdir)/operations-enums.h $(GIMP_MKENUMS) Makefile.am
+	$(AM_V_GEN) $(GIMP_MKENUMS) \
+		--fhead "#include \"config.h\"\n#include <gio/gio.h>\n#include \"libgimpbase/gimpbase.h\"\n#include \"operations-enums.h\"\n#include \"gimp-intl.h\"" \
+		--fprod "\n/* enumerations from \"@basename@\" */" \
+		--vhead "GType\n@enum_name@_get_type (void)\n{\n  static const G@Type@Value values[] =\n  {" \
+		--vprod "    { @VALUENAME@, \"@VALUENAME@\", \"@valuenick@\" }," \
+		--vtail "    { 0, NULL, NULL }\n  };\n" \
+		--dhead "  static const Gimp@Type@Desc descs[] =\n  {" \
+		--dprod "    { @VALUENAME@, @valuedesc@, @valuehelp@ },@if ('@valueabbrev@' ne 'NULL')@\n    /* Translators: this is an abbreviated version of @valueudesc@.\n       Keep it short. */\n    { @VALUENAME@, @valueabbrev@, NULL },@endif@" \
+		--dtail "    { 0, NULL, NULL }\n  };\n\n  static GType type = 0;\n\n  if (G_UNLIKELY (! type))\n    {\n      type = g_@type@_register_static (\"@EnumName@\", values);\n      gimp_type_set_translation_context (type, \"@enumnick@\");\n      gimp_@type@_set_value_descriptions (type, descs);\n    }\n\n  return type;\n}\n" \
+		$< > $@
+
+# copy the generated enum file back to the source directory only if it's
+# changed; otherwise, only update its timestamp, so that the recipe isn't
+# executed again on the next build, however, allow this to (harmlessly) fail,
+# to support building from a read-only source tree.
+$(srcdir)/operations-enums.c: xgen-oec
+	$(AM_V_GEN) if ! cmp -s $< $@; then \
+		cp $< $@; \
+	else \
+		touch $@ 2> /dev/null \
+		|| true; \
+	fi
diff --git a/app/operations/Makefile.in b/app/operations/Makefile.in
new file mode 100644
index 0000000..ebc6de3
--- /dev/null
+++ b/app/operations/Makefile.in
@@ -0,0 +1,1375 @@
+# Makefile.in generated by automake 1.16.2 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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+
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+CONFIG_CLEAN_VPATH_FILES =
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+am__v_AR_ = $(am__v_AR_@AM_DEFAULT_V@)
+am__v_AR_0 = @echo "  AR      " $@;
+am__v_AR_1 = 
+libappoperations_a_AR = $(AR) $(ARFLAGS)
+libappoperations_a_LIBADD =
+am__objects_1 = operations-enums.$(OBJEXT)
+am__objects_2 = gimp-operations.$(OBJEXT) \
+	gimp-operation-config.$(OBJEXT) \
+	gimpoperationsettings.$(OBJEXT) \
+	gimpbrightnesscontrastconfig.$(OBJEXT) \
+	gimpcageconfig.$(OBJEXT) gimpcolorbalanceconfig.$(OBJEXT) \
+	gimpcurvesconfig.$(OBJEXT) gimphuesaturationconfig.$(OBJEXT) \
+	gimplevelsconfig.$(OBJEXT) gimpoperationborder.$(OBJEXT) \
+	gimpoperationbuffersourcevalidate.$(OBJEXT) \
+	gimpoperationcagecoefcalc.$(OBJEXT) \
+	gimpoperationcagetransform.$(OBJEXT) \
+	gimpoperationcomposecrop.$(OBJEXT) \
+	gimpoperationequalize.$(OBJEXT) \
+	gimpoperationfillsource.$(OBJEXT) gimpoperationflood.$(OBJEXT) \
+	gimpoperationgradient.$(OBJEXT) gimpoperationgrow.$(OBJEXT) \
+	gimpoperationhistogramsink.$(OBJEXT) \
+	gimpoperationmaskcomponents.$(OBJEXT) \
+	gimpoperationoffset.$(OBJEXT) \
+	gimpoperationprofiletransform.$(OBJEXT) \
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+	gimpoperationsemiflatten.$(OBJEXT) \
+	gimpoperationsetalpha.$(OBJEXT) gimpoperationshrink.$(OBJEXT) \
+	gimpoperationthresholdalpha.$(OBJEXT) \
+	gimpoperationpointfilter.$(OBJEXT) \
+	gimpoperationbrightnesscontrast.$(OBJEXT) \
+	gimpoperationcolorbalance.$(OBJEXT) \
+	gimpoperationcolorize.$(OBJEXT) gimpoperationcurves.$(OBJEXT) \
+	gimpoperationdesaturate.$(OBJEXT) \
+	gimpoperationhuesaturation.$(OBJEXT) \
+	gimpoperationlevels.$(OBJEXT) gimpoperationposterize.$(OBJEXT) \
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+	./$(DEPDIR)/gimp-operations.Po \
+	./$(DEPDIR)/gimpbrightnesscontrastconfig.Po \
+	./$(DEPDIR)/gimpcageconfig.Po \
+	./$(DEPDIR)/gimpcolorbalanceconfig.Po \
+	./$(DEPDIR)/gimpcurvesconfig.Po \
+	./$(DEPDIR)/gimphuesaturationconfig.Po \
+	./$(DEPDIR)/gimplevelsconfig.Po \
+	./$(DEPDIR)/gimpoperationborder.Po \
+	./$(DEPDIR)/gimpoperationbrightnesscontrast.Po \
+	./$(DEPDIR)/gimpoperationbuffersourcevalidate.Po \
+	./$(DEPDIR)/gimpoperationcagecoefcalc.Po \
+	./$(DEPDIR)/gimpoperationcagetransform.Po \
+	./$(DEPDIR)/gimpoperationcolorbalance.Po \
+	./$(DEPDIR)/gimpoperationcolorize.Po \
+	./$(DEPDIR)/gimpoperationcomposecrop.Po \
+	./$(DEPDIR)/gimpoperationcurves.Po \
+	./$(DEPDIR)/gimpoperationdesaturate.Po \
+	./$(DEPDIR)/gimpoperationequalize.Po \
+	./$(DEPDIR)/gimpoperationfillsource.Po \
+	./$(DEPDIR)/gimpoperationflood.Po \
+	./$(DEPDIR)/gimpoperationgradient.Po \
+	./$(DEPDIR)/gimpoperationgrow.Po \
+	./$(DEPDIR)/gimpoperationhistogramsink.Po \
+	./$(DEPDIR)/gimpoperationhuesaturation.Po \
+	./$(DEPDIR)/gimpoperationlevels.Po \
+	./$(DEPDIR)/gimpoperationmaskcomponents.Po \
+	./$(DEPDIR)/gimpoperationoffset.Po \
+	./$(DEPDIR)/gimpoperationpointfilter.Po \
+	./$(DEPDIR)/gimpoperationposterize.Po \
+	./$(DEPDIR)/gimpoperationprofiletransform.Po \
+	./$(DEPDIR)/gimpoperationscalarmultiply.Po \
+	./$(DEPDIR)/gimpoperationsemiflatten.Po \
+	./$(DEPDIR)/gimpoperationsetalpha.Po \
+	./$(DEPDIR)/gimpoperationsettings.Po \
+	./$(DEPDIR)/gimpoperationshrink.Po \
+	./$(DEPDIR)/gimpoperationthreshold.Po \
+	./$(DEPDIR)/gimpoperationthresholdalpha.Po \
+	./$(DEPDIR)/operations-enums.Po
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+HAVE_ISFINITE = @HAVE_ISFINITE@
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+HOST_GLIB_COMPILE_RESOURCES = @HOST_GLIB_COMPILE_RESOURCES@
+HTML_DIR = @HTML_DIR@
+INSTALL = @INSTALL@
+INSTALL_DATA = @INSTALL_DATA@
+INSTALL_PROGRAM = @INSTALL_PROGRAM@
+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+INSTOBJEXT = @INSTOBJEXT@
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+MIME_TYPES = @MIME_TYPES@
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+MYPAINT_BRUSHES_CFLAGS = @MYPAINT_BRUSHES_CFLAGS@
+MYPAINT_BRUSHES_LIBS = @MYPAINT_BRUSHES_LIBS@
+NATIVE_GLIB_CFLAGS = @NATIVE_GLIB_CFLAGS@
+NATIVE_GLIB_LIBS = @NATIVE_GLIB_LIBS@
+NM = @NM@
+NMEDIT = @NMEDIT@
+OBJDUMP = @OBJDUMP@
+OBJEXT = @OBJEXT@
+OPENEXR_CFLAGS = @OPENEXR_CFLAGS@
+OPENEXR_LIBS = @OPENEXR_LIBS@
+OPENEXR_REQUIRED_VERSION = @OPENEXR_REQUIRED_VERSION@
+OPENJPEG_CFLAGS = @OPENJPEG_CFLAGS@
+OPENJPEG_LIBS = @OPENJPEG_LIBS@
+OPENJPEG_REQUIRED_VERSION = @OPENJPEG_REQUIRED_VERSION@
+OTOOL = @OTOOL@
+OTOOL64 = @OTOOL64@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PANGOCAIRO_CFLAGS = @PANGOCAIRO_CFLAGS@
+PANGOCAIRO_LIBS = @PANGOCAIRO_LIBS@
+PANGOCAIRO_REQUIRED_VERSION = @PANGOCAIRO_REQUIRED_VERSION@
+PATHSEP = @PATHSEP@
+PATH_SEPARATOR = @PATH_SEPARATOR@
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+PYTHON_INCLUDES = @PYTHON_INCLUDES@
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+build_cpu = @build_cpu@
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+build_vendor = @build_vendor@
+builddir = @builddir@
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+docdir = @docdir@
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+htmldir = @htmldir@
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+infodir = @infodir@
+install_sh = @install_sh@
+intltool__v_merge_options_ = @intltool__v_merge_options_@
+intltool__v_merge_options_0 = @intltool__v_merge_options_0@
+libdir = @libdir@
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+manpage_gimpdir = @manpage_gimpdir@
+mkdir_p = @mkdir_p@
+ms_librarian = @ms_librarian@
+mypaint_brushes_dir = @mypaint_brushes_dir@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+pkgpyexecdir = @pkgpyexecdir@
+pkgpythondir = @pkgpythondir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
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+runstatedir = @runstatedir@
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+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+SUBDIRS = \
+	layer-modes		\
+	layer-modes-legacy	\
+	tests
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-Operations\"	\
+	-I$(top_builddir)			\
+	-I$(top_srcdir)				\
+	-I$(top_builddir)/app			\
+	-I$(top_srcdir)/app			\
+	$(CAIRO_CFLAGS)				\
+	$(GEGL_CFLAGS)				\
+	$(GDK_PIXBUF_CFLAGS)			\
+	-I$(includedir)
+
+noinst_LIBRARIES = \
+	libappoperations.a
+
+libappoperations_a_sources = \
+	operations-types.h			\
+	operations-enums.h			\
+	gimp-operations.c			\
+	gimp-operations.h			\
+	\
+	gimp-operation-config.c			\
+	gimp-operation-config.h			\
+	gimpoperationsettings.c			\
+	gimpoperationsettings.h			\
+	gimpbrightnesscontrastconfig.c		\
+	gimpbrightnesscontrastconfig.h		\
+	gimpcageconfig.c			\
+	gimpcageconfig.h			\
+	gimpcolorbalanceconfig.c		\
+	gimpcolorbalanceconfig.h		\
+	gimpcurvesconfig.c			\
+	gimpcurvesconfig.h			\
+	gimphuesaturationconfig.c		\
+	gimphuesaturationconfig.h		\
+	gimplevelsconfig.c			\
+	gimplevelsconfig.h			\
+	\
+	gimpoperationborder.c			\
+	gimpoperationborder.h			\
+	gimpoperationbuffersourcevalidate.c	\
+	gimpoperationbuffersourcevalidate.h	\
+	gimpoperationcagecoefcalc.c		\
+	gimpoperationcagecoefcalc.h		\
+	gimpoperationcagetransform.c		\
+	gimpoperationcagetransform.h		\
+	gimpoperationcomposecrop.c		\
+	gimpoperationcomposecrop.h		\
+	gimpoperationequalize.c			\
+	gimpoperationequalize.h			\
+	gimpoperationfillsource.c		\
+	gimpoperationfillsource.h		\
+	gimpoperationflood.c			\
+	gimpoperationflood.h			\
+	gimpoperationgradient.c			\
+	gimpoperationgradient.h			\
+	gimpoperationgrow.c			\
+	gimpoperationgrow.h			\
+	gimpoperationhistogramsink.c		\
+	gimpoperationhistogramsink.h		\
+	gimpoperationmaskcomponents.cc		\
+	gimpoperationmaskcomponents.h		\
+	gimpoperationoffset.c			\
+	gimpoperationoffset.h			\
+	gimpoperationprofiletransform.c		\
+	gimpoperationprofiletransform.h		\
+	gimpoperationscalarmultiply.c		\
+	gimpoperationscalarmultiply.h		\
+	gimpoperationsemiflatten.c		\
+	gimpoperationsemiflatten.h		\
+	gimpoperationsetalpha.c			\
+	gimpoperationsetalpha.h			\
+	gimpoperationshrink.c			\
+	gimpoperationshrink.h			\
+	gimpoperationthresholdalpha.c		\
+	gimpoperationthresholdalpha.h		\
+	\
+	gimpoperationpointfilter.c		\
+	gimpoperationpointfilter.h		\
+	gimpoperationbrightnesscontrast.c	\
+	gimpoperationbrightnesscontrast.h	\
+	gimpoperationcolorbalance.c		\
+	gimpoperationcolorbalance.h		\
+	gimpoperationcolorize.c			\
+	gimpoperationcolorize.h			\
+	gimpoperationcurves.c			\
+	gimpoperationcurves.h			\
+	gimpoperationdesaturate.c		\
+	gimpoperationdesaturate.h		\
+	gimpoperationhuesaturation.c		\
+	gimpoperationhuesaturation.h		\
+	gimpoperationlevels.c			\
+	gimpoperationlevels.h			\
+	gimpoperationposterize.c		\
+	gimpoperationposterize.h		\
+	gimpoperationthreshold.c		\
+	gimpoperationthreshold.h
+
+libappoperations_a_built_sources = operations-enums.c
+libappoperations_a_SOURCES = \
+	$(libappoperations_a_built_sources)	\
+	$(libappoperations_a_sources)
+
+
+#
+# rules to generate built sources
+#
+# setup autogeneration dependencies
+gen_sources = xgen-oec
+CLEANFILES = $(gen_sources)
+all: all-recursive
+
+.SUFFIXES:
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/gimp-operation-config.Po
+	-rm -f ./$(DEPDIR)/gimp-operations.Po
+	-rm -f ./$(DEPDIR)/gimpbrightnesscontrastconfig.Po
+	-rm -f ./$(DEPDIR)/gimpcageconfig.Po
+	-rm -f ./$(DEPDIR)/gimpcolorbalanceconfig.Po
+	-rm -f ./$(DEPDIR)/gimpcurvesconfig.Po
+	-rm -f ./$(DEPDIR)/gimphuesaturationconfig.Po
+	-rm -f ./$(DEPDIR)/gimplevelsconfig.Po
+	-rm -f ./$(DEPDIR)/gimpoperationborder.Po
+	-rm -f ./$(DEPDIR)/gimpoperationbrightnesscontrast.Po
+	-rm -f ./$(DEPDIR)/gimpoperationbuffersourcevalidate.Po
+	-rm -f ./$(DEPDIR)/gimpoperationcagecoefcalc.Po
+	-rm -f ./$(DEPDIR)/gimpoperationcagetransform.Po
+	-rm -f ./$(DEPDIR)/gimpoperationcolorbalance.Po
+	-rm -f ./$(DEPDIR)/gimpoperationcolorize.Po
+	-rm -f ./$(DEPDIR)/gimpoperationcomposecrop.Po
+	-rm -f ./$(DEPDIR)/gimpoperationcurves.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdesaturate.Po
+	-rm -f ./$(DEPDIR)/gimpoperationequalize.Po
+	-rm -f ./$(DEPDIR)/gimpoperationfillsource.Po
+	-rm -f ./$(DEPDIR)/gimpoperationflood.Po
+	-rm -f ./$(DEPDIR)/gimpoperationgradient.Po
+	-rm -f ./$(DEPDIR)/gimpoperationgrow.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhistogramsink.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhuesaturation.Po
+	-rm -f ./$(DEPDIR)/gimpoperationlevels.Po
+	-rm -f ./$(DEPDIR)/gimpoperationmaskcomponents.Po
+	-rm -f ./$(DEPDIR)/gimpoperationoffset.Po
+	-rm -f ./$(DEPDIR)/gimpoperationpointfilter.Po
+	-rm -f ./$(DEPDIR)/gimpoperationposterize.Po
+	-rm -f ./$(DEPDIR)/gimpoperationprofiletransform.Po
+	-rm -f ./$(DEPDIR)/gimpoperationscalarmultiply.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsemiflatten.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsetalpha.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsettings.Po
+	-rm -f ./$(DEPDIR)/gimpoperationshrink.Po
+	-rm -f ./$(DEPDIR)/gimpoperationthreshold.Po
+	-rm -f ./$(DEPDIR)/gimpoperationthresholdalpha.Po
+	-rm -f ./$(DEPDIR)/operations-enums.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic clean-libtool \
+	clean-noinstLIBRARIES cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	installdirs-am maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am
+
+.PRECIOUS: Makefile
+
+
+xgen-oec: $(srcdir)/operations-enums.h $(GIMP_MKENUMS) Makefile.am
+	$(AM_V_GEN) $(GIMP_MKENUMS) \
+		--fhead "#include \"config.h\"\n#include <gio/gio.h>\n#include \"libgimpbase/gimpbase.h\"\n#include \"operations-enums.h\"\n#include \"gimp-intl.h\"" \
+		--fprod "\n/* enumerations from \"@basename@\" */" \
+		--vhead "GType\n@enum_name@_get_type (void)\n{\n  static const G@Type@Value values[] =\n  {" \
+		--vprod "    { @VALUENAME@, \"@VALUENAME@\", \"@valuenick@\" }," \
+		--vtail "    { 0, NULL, NULL }\n  };\n" \
+		--dhead "  static const Gimp@Type@Desc descs[] =\n  {" \
+		--dprod "    { @VALUENAME@, @valuedesc@, @valuehelp@ },@if ('@valueabbrev@' ne 'NULL')@\n    /* Translators: this is an abbreviated version of @valueudesc@.\n       Keep it short. */\n    { @VALUENAME@, @valueabbrev@, NULL },@endif@" \
+		--dtail "    { 0, NULL, NULL }\n  };\n\n  static GType type = 0;\n\n  if (G_UNLIKELY (! type))\n    {\n      type = g_@type@_register_static (\"@EnumName@\", values);\n      gimp_type_set_translation_context (type, \"@enumnick@\");\n      gimp_@type@_set_value_descriptions (type, descs);\n    }\n\n  return type;\n}\n" \
+		$< > $@
+
+# copy the generated enum file back to the source directory only if it's
+# changed; otherwise, only update its timestamp, so that the recipe isn't
+# executed again on the next build, however, allow this to (harmlessly) fail,
+# to support building from a read-only source tree.
+$(srcdir)/operations-enums.c: xgen-oec
+	$(AM_V_GEN) if ! cmp -s $< $@; then \
+		cp $< $@; \
+	else \
+		touch $@ 2> /dev/null \
+		|| true; \
+	fi
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/app/operations/gimp-operation-config.c b/app/operations/gimp-operation-config.c
new file mode 100644
index 0000000..492cefd
--- /dev/null
+++ b/app/operations/gimp-operation-config.c
@@ -0,0 +1,827 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "core/gimp.h"
+
+#include "core/gimplist.h"
+#include "core/gimpparamspecs-duplicate.h"
+#include "core/gimpviewable.h"
+
+#include "gegl/gimp-gegl-utils.h"
+
+#include "gimp-operation-config.h"
+#include "gimpoperationsettings.h"
+
+
+/*  local function prototypes  */
+
+static void    gimp_operation_config_config_sync   (GObject          *config,
+                                                    const GParamSpec *gimp_pspec,
+                                                    GeglNode         *node);
+static void    gimp_operation_config_config_notify (GObject          *config,
+                                                    const GParamSpec *gimp_pspec,
+                                                    GeglNode         *node);
+static void    gimp_operation_config_node_notify   (GeglNode         *node,
+                                                    const GParamSpec *gegl_pspec,
+                                                    GObject          *config);
+
+static GFile * gimp_operation_config_get_file      (GType             config_type);
+static void    gimp_operation_config_add_sep       (GimpContainer    *container);
+static void    gimp_operation_config_remove_sep    (GimpContainer    *container);
+
+
+/*  public functions  */
+
+static GHashTable *
+gimp_operation_config_get_type_table (Gimp *gimp)
+{
+  static GHashTable *config_types = NULL;
+
+  if (! config_types)
+    config_types = g_hash_table_new_full (g_str_hash,
+                                          g_str_equal,
+                                          (GDestroyNotify) g_free,
+                                          NULL);
+
+  return config_types;
+}
+
+static GHashTable *
+gimp_operation_config_get_container_table (Gimp *gimp)
+{
+  static GHashTable *config_containers = NULL;
+
+  if (! config_containers)
+    config_containers = g_hash_table_new_full (g_direct_hash,
+                                               g_direct_equal,
+                                               NULL,
+                                               (GDestroyNotify) g_object_unref);
+
+  return config_containers;
+}
+
+static GValue *
+gimp_operation_config_value_new (GParamSpec *pspec)
+{
+  GValue *value = g_slice_new0 (GValue);
+
+  g_value_init (value, pspec->value_type);
+  g_param_value_set_default (pspec, value);
+
+  return value;
+}
+
+static void
+gimp_operation_config_value_free (GValue *value)
+{
+  g_value_unset (value);
+  g_slice_free (GValue, value);
+}
+
+static GHashTable *
+gimp_operation_config_get_properties (GObject *object)
+{
+  GHashTable *properties = g_object_get_data (object, "properties");
+
+  if (! properties)
+    {
+      properties = g_hash_table_new_full (g_str_hash,
+                                          g_str_equal,
+                                          (GDestroyNotify) g_free,
+                                          (GDestroyNotify) gimp_operation_config_value_free);
+
+      g_object_set_data_full (object, "properties", properties,
+                              (GDestroyNotify) g_hash_table_unref);
+    }
+
+  return properties;
+}
+
+static GValue *
+gimp_operation_config_value_get (GObject    *object,
+                                 GParamSpec *pspec)
+{
+  GHashTable *properties = gimp_operation_config_get_properties (object);
+  GValue     *value;
+
+  value = g_hash_table_lookup (properties, pspec->name);
+
+  if (! value)
+    {
+      value = gimp_operation_config_value_new (pspec);
+      g_hash_table_insert (properties, g_strdup (pspec->name), value);
+    }
+
+  return value;
+}
+
+static void
+gimp_operation_config_set_property (GObject      *object,
+                                    guint         property_id,
+                                    const GValue *value,
+                                    GParamSpec   *pspec)
+{
+  GValue *val = gimp_operation_config_value_get (object, pspec);
+
+  g_value_copy (value, val);
+}
+
+static void
+gimp_operation_config_get_property (GObject    *object,
+                                    guint       property_id,
+                                    GValue     *value,
+                                    GParamSpec *pspec)
+{
+  GValue *val = gimp_operation_config_value_get (object, pspec);
+
+  g_value_copy (val, value);
+}
+
+static void
+gimp_operation_config_class_init (GObjectClass *klass,
+                                  const gchar  *operation)
+{
+  GParamSpec **pspecs;
+  guint        n_pspecs;
+  gint         i;
+
+  klass->set_property = gimp_operation_config_set_property;
+  klass->get_property = gimp_operation_config_get_property;
+
+  pspecs = gegl_operation_list_properties (operation, &n_pspecs);
+
+  for (i = 0; i < n_pspecs; i++)
+    {
+      GParamSpec *pspec = pspecs[i];
+
+      if ((pspec->flags & G_PARAM_READABLE) &&
+          (pspec->flags & G_PARAM_WRITABLE) &&
+          strcmp (pspec->name, "input")     &&
+          strcmp (pspec->name, "output"))
+        {
+          GParamSpec *copy = gimp_param_spec_duplicate (pspec);
+
+          if (copy)
+            {
+              g_object_class_install_property (klass, i + 1, copy);
+            }
+        }
+    }
+
+  g_free (pspecs);
+}
+
+static gboolean
+gimp_operation_config_equal (GimpConfig *a,
+                             GimpConfig *b)
+{
+  GList    *diff;
+  gboolean  equal = TRUE;
+
+  diff = gimp_config_diff (G_OBJECT (a), G_OBJECT (b),
+                           GIMP_CONFIG_PARAM_SERIALIZE);
+
+  if (G_TYPE_FROM_INSTANCE (a) == G_TYPE_FROM_INSTANCE (b))
+    {
+      GList *list;
+
+      for (list = diff; list; list = g_list_next (list))
+        {
+          GParamSpec *pspec = list->data;
+
+          if (g_type_is_a (pspec->owner_type, GIMP_TYPE_OPERATION_SETTINGS))
+            {
+              equal = FALSE;
+              break;
+            }
+        }
+    }
+  else if (diff)
+    {
+      equal = FALSE;
+    }
+
+  g_list_free (diff);
+
+  return equal;
+}
+
+static void
+gimp_operation_config_config_iface_init (GimpConfigInterface *iface)
+{
+  iface->equal = gimp_operation_config_equal;
+}
+
+
+/*  public functions  */
+
+void
+gimp_operation_config_register (Gimp        *gimp,
+                                const gchar *operation,
+                                GType        config_type)
+{
+  GHashTable *config_types;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (operation != NULL);
+  g_return_if_fail (g_type_is_a (config_type, GIMP_TYPE_OBJECT));
+
+  config_types = gimp_operation_config_get_type_table (gimp);
+
+  g_hash_table_insert (config_types,
+                       g_strdup (operation),
+                       (gpointer) config_type);
+ }
+
+GType
+gimp_operation_config_get_type (Gimp        *gimp,
+                                const gchar *operation,
+                                const gchar *icon_name,
+                                GType        parent_type)
+{
+  GHashTable *config_types;
+  GType       config_type;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), G_TYPE_NONE);
+  g_return_val_if_fail (operation != NULL, G_TYPE_NONE);
+
+  config_types = gimp_operation_config_get_type_table (gimp);
+
+  config_type = (GType) g_hash_table_lookup (config_types, operation);
+
+  if (! config_type)
+    {
+      GTypeQuery query;
+
+      g_return_val_if_fail (g_type_is_a (parent_type, GIMP_TYPE_OBJECT),
+                            G_TYPE_NONE);
+
+      g_type_query (parent_type, &query);
+
+      {
+        GTypeInfo info =
+        {
+          query.class_size,
+          (GBaseInitFunc) NULL,
+          (GBaseFinalizeFunc) NULL,
+          (GClassInitFunc) gimp_operation_config_class_init,
+          NULL,           /* class_finalize */
+          operation,
+          query.instance_size,
+          0,              /* n_preallocs */
+          (GInstanceInitFunc) NULL,
+        };
+
+        const GInterfaceInfo config_info =
+        {
+          (GInterfaceInitFunc) gimp_operation_config_config_iface_init,
+          NULL, /* interface_finalize */
+          NULL  /* interface_data     */
+        };
+
+        gchar *type_name = g_strdup_printf ("GimpGegl-%s-config",
+                                            operation);
+
+        g_strcanon (type_name,
+                    G_CSET_DIGITS "-" G_CSET_a_2_z G_CSET_A_2_Z, '-');
+
+        config_type = g_type_register_static (parent_type, type_name,
+                                              &info, 0);
+
+        g_free (type_name);
+
+        g_type_add_interface_static (config_type, GIMP_TYPE_CONFIG,
+                                     &config_info);
+
+        if (icon_name && g_type_is_a (config_type, GIMP_TYPE_VIEWABLE))
+          {
+            GimpViewableClass *viewable_class = g_type_class_ref (config_type);
+
+            viewable_class->default_icon_name = g_strdup (icon_name);
+
+            g_type_class_unref (viewable_class);
+          }
+
+        gimp_operation_config_register (gimp, operation, config_type);
+      }
+    }
+
+  return config_type;
+}
+
+GimpContainer *
+gimp_operation_config_get_container (Gimp         *gimp,
+                                     GType         config_type,
+                                     GCompareFunc  sort_func)
+{
+  GHashTable    *config_containers;
+  GimpContainer *container;
+
+  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
+  g_return_val_if_fail (g_type_is_a (config_type, GIMP_TYPE_OBJECT), NULL);
+
+  config_containers = gimp_operation_config_get_container_table (gimp);
+
+  container = g_hash_table_lookup (config_containers, (gpointer) config_type);
+
+  if (! container)
+    {
+      container = gimp_list_new (config_type, TRUE);
+      gimp_list_set_sort_func (GIMP_LIST (container), sort_func);
+
+      g_hash_table_insert (config_containers,
+                           (gpointer) config_type, container);
+
+      gimp_operation_config_deserialize (gimp, container, NULL);
+
+      if (gimp_container_get_n_children (container) == 0)
+        {
+          GFile *file = gimp_operation_config_get_file (config_type);
+
+          if (! g_file_query_exists (file, NULL))
+            {
+              GQuark  quark = g_quark_from_static_string ("compat-file");
+              GFile  *compat_file;
+
+              compat_file = g_type_get_qdata (config_type, quark);
+
+              if (compat_file)
+                {
+                  if (! g_file_move (compat_file, file, 0,
+                                     NULL, NULL, NULL, NULL))
+                    {
+                      gimp_operation_config_deserialize (gimp, container,
+                                                         compat_file);
+                    }
+                  else
+                    {
+                      gimp_operation_config_deserialize (gimp, container, NULL);
+                    }
+                }
+            }
+
+          g_object_unref (file);
+        }
+
+      gimp_operation_config_add_sep (container);
+    }
+
+  return container;
+}
+
+void
+gimp_operation_config_serialize (Gimp          *gimp,
+                                 GimpContainer *container,
+                                 GFile         *file)
+{
+  GError *error = NULL;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (GIMP_IS_CONTAINER (container));
+  g_return_if_fail (file == NULL || G_IS_FILE (file));
+
+  if (file)
+    {
+      g_object_ref (file);
+    }
+  else
+    {
+      GType config_type = gimp_container_get_children_type (container);
+
+      file = gimp_operation_config_get_file (config_type);
+    }
+
+  if (gimp->be_verbose)
+    g_print ("Writing '%s'\n", gimp_file_get_utf8_name (file));
+
+  gimp_operation_config_remove_sep (container);
+
+  if (! gimp_config_serialize_to_gfile (GIMP_CONFIG (container),
+                                        file,
+                                        "settings",
+                                        "end of settings",
+                                        NULL, &error))
+    {
+      gimp_message_literal (gimp, NULL, GIMP_MESSAGE_ERROR,
+                            error->message);
+      g_clear_error (&error);
+    }
+
+  gimp_operation_config_add_sep (container);
+
+  g_object_unref (file);
+}
+
+void
+gimp_operation_config_deserialize (Gimp          *gimp,
+                                   GimpContainer *container,
+                                   GFile         *file)
+{
+  GError *error = NULL;
+
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+  g_return_if_fail (GIMP_IS_CONTAINER (container));
+  g_return_if_fail (file == NULL || G_IS_FILE (file));
+
+  if (file)
+    {
+      g_object_ref (file);
+    }
+  else
+    {
+      GType config_type = gimp_container_get_children_type (container);
+
+      file = gimp_operation_config_get_file (config_type);
+    }
+
+  if (gimp->be_verbose)
+    g_print ("Parsing '%s'\n", gimp_file_get_utf8_name (file));
+
+  if (! gimp_config_deserialize_gfile (GIMP_CONFIG (container),
+                                       file,
+                                       NULL, &error))
+    {
+      if (error->code != GIMP_CONFIG_ERROR_OPEN_ENOENT)
+        gimp_message_literal (gimp, NULL, GIMP_MESSAGE_ERROR,
+                              error->message);
+
+      g_clear_error (&error);
+    }
+
+  g_object_unref (file);
+}
+
+void
+gimp_operation_config_sync_node (GObject  *config,
+                                 GeglNode *node)
+{
+  GParamSpec **pspecs;
+  gchar       *operation;
+  guint        n_pspecs;
+  gint         i;
+
+  g_return_if_fail (G_IS_OBJECT (config));
+  g_return_if_fail (GEGL_IS_NODE (node));
+
+  gegl_node_get (node,
+                 "operation", &operation,
+                 NULL);
+
+  g_return_if_fail (operation != NULL);
+
+  pspecs = gegl_operation_list_properties (operation, &n_pspecs);
+  g_free (operation);
+
+  for (i = 0; i < n_pspecs; i++)
+    {
+      GParamSpec *gegl_pspec = pspecs[i];
+      GParamSpec *gimp_pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (config),
+                                                             gegl_pspec->name);
+
+      /*  if the operation has an object property of the config's
+       *  type, use the config object directly
+       */
+      if (G_IS_PARAM_SPEC_OBJECT (gegl_pspec) &&
+          gegl_pspec->value_type == G_TYPE_FROM_INSTANCE (config))
+        {
+          gegl_node_set (node,
+                         gegl_pspec->name, config,
+                         NULL);
+        }
+      else if (gimp_pspec)
+        {
+          GValue value = G_VALUE_INIT;
+
+          g_value_init (&value, gimp_pspec->value_type);
+
+          g_object_get_property (G_OBJECT (config), gimp_pspec->name,
+                                 &value);
+
+          if (GEGL_IS_PARAM_SPEC_COLOR (gegl_pspec))
+            {
+              GimpRGB    gimp_color;
+              GeglColor *gegl_color;
+
+              gimp_value_get_rgb (&value, &gimp_color);
+              g_value_unset (&value);
+
+              gegl_color = gimp_gegl_color_new (&gimp_color);
+
+              g_value_init (&value, gegl_pspec->value_type);
+              g_value_take_object (&value, gegl_color);
+            }
+
+          gegl_node_set_property (node, gegl_pspec->name,
+                                  &value);
+
+          g_value_unset (&value);
+        }
+    }
+
+  g_free (pspecs);
+}
+
+void
+gimp_operation_config_connect_node (GObject  *config,
+                                    GeglNode *node)
+{
+  GParamSpec **pspecs;
+  gchar       *operation;
+  guint        n_pspecs;
+  gint         i;
+
+  g_return_if_fail (G_IS_OBJECT (config));
+  g_return_if_fail (GEGL_IS_NODE (node));
+
+  gegl_node_get (node,
+                 "operation", &operation,
+                 NULL);
+
+  g_return_if_fail (operation != NULL);
+
+  pspecs = gegl_operation_list_properties (operation, &n_pspecs);
+  g_free (operation);
+
+  for (i = 0; i < n_pspecs; i++)
+    {
+      GParamSpec *pspec = pspecs[i];
+
+      /*  if the operation has an object property of the config's
+       *  type, connect it to a special callback and done
+       */
+      if (G_IS_PARAM_SPEC_OBJECT (pspec) &&
+          pspec->value_type == G_TYPE_FROM_INSTANCE (config))
+        {
+          g_signal_connect_object (config, "notify",
+                                   G_CALLBACK (gimp_operation_config_config_sync),
+                                   node, 0);
+          g_free (pspecs);
+          return;
+        }
+    }
+
+  for (i = 0; i < n_pspecs; i++)
+    {
+      GParamSpec *gegl_pspec = pspecs[i];
+      GParamSpec *gimp_pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (config),
+                                                             gegl_pspec->name);
+
+      if (gimp_pspec)
+        {
+          gchar *notify_name = g_strconcat ("notify::", gimp_pspec->name, NULL);
+
+          g_signal_connect_object (config, notify_name,
+                                   G_CALLBACK (gimp_operation_config_config_notify),
+                                   node, 0);
+
+          g_signal_connect_object (node, notify_name,
+                                   G_CALLBACK (gimp_operation_config_node_notify),
+                                   config, 0);
+
+          g_free (notify_name);
+        }
+    }
+
+  g_free (pspecs);
+}
+
+GParamSpec **
+gimp_operation_config_list_properties (GObject     *config,
+                                       GType        owner_type,
+                                       GParamFlags  flags,
+                                       guint       *n_pspecs)
+{
+  GParamSpec **param_specs;
+  guint        n_param_specs;
+  gint         i, j;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+
+  param_specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (config),
+                                                &n_param_specs);
+
+  for (i = 0, j = 0; i < n_param_specs; i++)
+    {
+      GParamSpec *pspec = param_specs[i];
+
+      /*  ignore properties of parent classes of owner_type  */
+      if (! g_type_is_a (pspec->owner_type, owner_type))
+        continue;
+
+      if (flags && ((pspec->flags & flags) != flags))
+        continue;
+
+      if (gimp_gegl_param_spec_has_key (pspec, "role", "output-extent"))
+        continue;
+
+      param_specs[j] = param_specs[i];
+      j++;
+    }
+
+  if (n_pspecs)
+    *n_pspecs = j;
+
+  if (j == 0)
+    {
+      g_free (param_specs);
+      param_specs = NULL;
+    }
+
+  return param_specs;
+}
+
+
+/*  private functions  */
+
+static void
+gimp_operation_config_config_sync (GObject          *config,
+                                   const GParamSpec *gimp_pspec,
+                                   GeglNode         *node)
+{
+  gimp_operation_config_sync_node (config, node);
+}
+
+static void
+gimp_operation_config_config_notify (GObject          *config,
+                                     const GParamSpec *gimp_pspec,
+                                     GeglNode         *node)
+{
+  GParamSpec *gegl_pspec = gegl_node_find_property (node, gimp_pspec->name);
+
+  if (gegl_pspec)
+    {
+      GValue value = G_VALUE_INIT;
+      gulong handler;
+
+      g_value_init (&value, gimp_pspec->value_type);
+      g_object_get_property (config, gimp_pspec->name, &value);
+
+      if (GEGL_IS_PARAM_SPEC_COLOR (gegl_pspec))
+        {
+          GimpRGB    gimp_color;
+          GeglColor *gegl_color;
+
+          gimp_value_get_rgb (&value, &gimp_color);
+          g_value_unset (&value);
+
+          gegl_color = gimp_gegl_color_new (&gimp_color);
+
+          g_value_init (&value, gegl_pspec->value_type);
+          g_value_take_object (&value, gegl_color);
+        }
+
+      handler = g_signal_handler_find (node,
+                                       G_SIGNAL_MATCH_DETAIL |
+                                       G_SIGNAL_MATCH_FUNC   |
+                                       G_SIGNAL_MATCH_DATA,
+                                       0,
+                                       g_quark_from_string (gegl_pspec->name),
+                                       NULL,
+                                       gimp_operation_config_node_notify,
+                                       config);
+
+      if (handler)
+        g_signal_handler_block (node, handler);
+
+      gegl_node_set_property (node, gegl_pspec->name, &value);
+      g_value_unset (&value);
+
+      if (handler)
+        g_signal_handler_unblock (node, handler);
+
+    }
+}
+
+static void
+gimp_operation_config_node_notify (GeglNode         *node,
+                                   const GParamSpec *gegl_pspec,
+                                   GObject          *config)
+{
+  GParamSpec *gimp_pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (config),
+                                                         gegl_pspec->name);
+
+  if (gimp_pspec)
+    {
+      GValue value = G_VALUE_INIT;
+      gulong handler;
+
+      g_value_init (&value, gegl_pspec->value_type);
+      gegl_node_get_property (node, gegl_pspec->name, &value);
+
+      if (GEGL_IS_PARAM_SPEC_COLOR (gegl_pspec))
+        {
+          GeglColor *gegl_color;
+          GimpRGB    gimp_color;
+
+          gegl_color = g_value_dup_object (&value);
+          g_value_unset (&value);
+
+          if (gegl_color)
+            {
+              gegl_color_get_rgba (gegl_color,
+                                   &gimp_color.r,
+                                   &gimp_color.g,
+                                   &gimp_color.b,
+                                   &gimp_color.a);
+              g_object_unref (gegl_color);
+            }
+          else
+            {
+              gimp_rgba_set (&gimp_color, 0.0, 0.0, 0.0, 1.0);
+            }
+
+          g_value_init (&value, gimp_pspec->value_type);
+          gimp_value_set_rgb (&value, &gimp_color);
+        }
+
+      handler = g_signal_handler_find (config,
+                                       G_SIGNAL_MATCH_DETAIL |
+                                       G_SIGNAL_MATCH_FUNC   |
+                                       G_SIGNAL_MATCH_DATA,
+                                       0,
+                                       g_quark_from_string (gimp_pspec->name),
+                                       NULL,
+                                       gimp_operation_config_config_notify,
+                                       node);
+
+      if (handler)
+        g_signal_handler_block (config, handler);
+
+      g_object_set_property (config, gimp_pspec->name, &value);
+      g_value_unset (&value);
+
+      if (handler)
+        g_signal_handler_unblock (config, handler);
+    }
+}
+
+static GFile *
+gimp_operation_config_get_file (GType config_type)
+{
+  GFile *file;
+  gchar *basename;
+
+  basename = g_strconcat (g_type_name (config_type), ".settings", NULL);
+  file = gimp_directory_file ("filters", basename, NULL);
+  g_free (basename);
+
+  return file;
+}
+
+static void
+gimp_operation_config_add_sep (GimpContainer *container)
+{
+  GimpObject *sep = g_object_get_data (G_OBJECT (container), "separator");
+
+  if (! sep)
+    {
+      sep = g_object_new (gimp_container_get_children_type (container),
+                          NULL);
+
+      gimp_container_add (container, sep);
+      g_object_unref (sep);
+
+      g_object_set_data (G_OBJECT (container), "separator", sep);
+    }
+}
+
+static void
+gimp_operation_config_remove_sep (GimpContainer *container)
+{
+  GimpObject *sep = g_object_get_data (G_OBJECT (container), "separator");
+
+  if (sep)
+    {
+      gimp_container_remove (container, sep);
+
+      g_object_set_data (G_OBJECT (container), "separator", NULL);
+    }
+}
diff --git a/app/operations/gimp-operation-config.h b/app/operations/gimp-operation-config.h
new file mode 100644
index 0000000..5f920e0
--- /dev/null
+++ b/app/operations/gimp-operation-config.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_CONFIG_H__
+#define __GIMP_OPERATION_CONFIG_H__
+
+
+void            gimp_operation_config_register      (Gimp          *gimp,
+                                                     const gchar   *operation,
+                                                     GType          config_type);
+
+GType           gimp_operation_config_get_type      (Gimp          *gimp,
+                                                     const gchar   *operation,
+                                                     const gchar   *icon_name,
+                                                     GType          parent_type);
+
+GimpContainer * gimp_operation_config_get_container (Gimp          *gimp,
+                                                     GType          config_type,
+                                                     GCompareFunc   sort_func);
+
+void            gimp_operation_config_serialize     (Gimp          *gimp,
+                                                     GimpContainer *container,
+                                                     GFile         *file);
+void            gimp_operation_config_deserialize   (Gimp          *gimp,
+                                                     GimpContainer *container,
+                                                     GFile         *file);
+
+void            gimp_operation_config_sync_node     (GObject       *config,
+                                                     GeglNode      *node);
+void            gimp_operation_config_connect_node  (GObject       *config,
+                                                     GeglNode      *node);
+
+GParamSpec ** gimp_operation_config_list_properties (GObject      *config,
+                                                     GType         owner_type,
+                                                     GParamFlags   flags,
+                                                     guint        *n_pspecs);
+
+
+#endif /* __GIMP_OPERATION_CONFIG_H__ */
diff --git a/app/operations/gimp-operations.c b/app/operations/gimp-operations.c
new file mode 100644
index 0000000..7cb30fd
--- /dev/null
+++ b/app/operations/gimp-operations.c
@@ -0,0 +1,225 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-operations.c
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "operations-types.h"
+
+#include "core/gimp.h"
+
+#include "gimp-operations.h"
+
+#include "gimpoperationborder.h"
+#include "gimpoperationbuffersourcevalidate.h"
+#include "gimpoperationcagecoefcalc.h"
+#include "gimpoperationcagetransform.h"
+#include "gimpoperationcomposecrop.h"
+#include "gimpoperationequalize.h"
+#include "gimpoperationfillsource.h"
+#include "gimpoperationflood.h"
+#include "gimpoperationgradient.h"
+#include "gimpoperationgrow.h"
+#include "gimpoperationhistogramsink.h"
+#include "gimpoperationmaskcomponents.h"
+#include "gimpoperationoffset.h"
+#include "gimpoperationprofiletransform.h"
+#include "gimpoperationscalarmultiply.h"
+#include "gimpoperationsemiflatten.h"
+#include "gimpoperationsetalpha.h"
+#include "gimpoperationshrink.h"
+#include "gimpoperationthresholdalpha.h"
+
+#include "gimpoperationbrightnesscontrast.h"
+#include "gimpoperationcolorbalance.h"
+#include "gimpoperationcolorize.h"
+#include "gimpoperationcurves.h"
+#include "gimpoperationdesaturate.h"
+#include "gimpoperationhuesaturation.h"
+#include "gimpoperationlevels.h"
+#include "gimpoperationposterize.h"
+#include "gimpoperationthreshold.h"
+
+#include "gimp-operation-config.h"
+#include "gimpbrightnesscontrastconfig.h"
+#include "gimpcolorbalanceconfig.h"
+#include "gimpcurvesconfig.h"
+#include "gimphuesaturationconfig.h"
+#include "gimplevelsconfig.h"
+
+#include "layer-modes-legacy/gimpoperationadditionlegacy.h"
+#include "layer-modes-legacy/gimpoperationburnlegacy.h"
+#include "layer-modes-legacy/gimpoperationdarkenonlylegacy.h"
+#include "layer-modes-legacy/gimpoperationdifferencelegacy.h"
+#include "layer-modes-legacy/gimpoperationdividelegacy.h"
+#include "layer-modes-legacy/gimpoperationdodgelegacy.h"
+#include "layer-modes-legacy/gimpoperationgrainextractlegacy.h"
+#include "layer-modes-legacy/gimpoperationgrainmergelegacy.h"
+#include "layer-modes-legacy/gimpoperationhardlightlegacy.h"
+#include "layer-modes-legacy/gimpoperationhslcolorlegacy.h"
+#include "layer-modes-legacy/gimpoperationhsvhuelegacy.h"
+#include "layer-modes-legacy/gimpoperationhsvsaturationlegacy.h"
+#include "layer-modes-legacy/gimpoperationhsvvaluelegacy.h"
+#include "layer-modes-legacy/gimpoperationlightenonlylegacy.h"
+#include "layer-modes-legacy/gimpoperationmultiplylegacy.h"
+#include "layer-modes-legacy/gimpoperationscreenlegacy.h"
+#include "layer-modes-legacy/gimpoperationsoftlightlegacy.h"
+#include "layer-modes-legacy/gimpoperationsubtractlegacy.h"
+
+#include "layer-modes/gimp-layer-modes.h"
+#include "layer-modes/gimpoperationantierase.h"
+#include "layer-modes/gimpoperationbehind.h"
+#include "layer-modes/gimpoperationdissolve.h"
+#include "layer-modes/gimpoperationerase.h"
+#include "layer-modes/gimpoperationmerge.h"
+#include "layer-modes/gimpoperationnormal.h"
+#include "layer-modes/gimpoperationpassthrough.h"
+#include "layer-modes/gimpoperationreplace.h"
+#include "layer-modes/gimpoperationsplit.h"
+
+
+static void
+set_compat_file (GType        type,
+                 const gchar *basename)
+{
+  GFile *file  = gimp_directory_file ("tool-options", basename, NULL);
+  GQuark quark = g_quark_from_static_string ("compat-file");
+
+  g_type_set_qdata (type, quark, file);
+}
+
+static void
+set_settings_folder (GType        type,
+                     const gchar *basename)
+{
+  GFile *file  = gimp_directory_file (basename, NULL);
+  GQuark quark = g_quark_from_static_string ("settings-folder");
+
+  g_type_set_qdata (type, quark, file);
+}
+
+void
+gimp_operations_init (Gimp *gimp)
+{
+  g_return_if_fail (GIMP_IS_GIMP (gimp));
+
+  gimp_layer_modes_init ();
+
+  g_type_class_ref (GIMP_TYPE_OPERATION_BORDER);
+  g_type_class_ref (GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_CAGE_COEF_CALC);
+  g_type_class_ref (GIMP_TYPE_OPERATION_CAGE_TRANSFORM);
+  g_type_class_ref (GIMP_TYPE_OPERATION_COMPOSE_CROP);
+  g_type_class_ref (GIMP_TYPE_OPERATION_EQUALIZE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_FILL_SOURCE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_FLOOD);
+  g_type_class_ref (GIMP_TYPE_OPERATION_GRADIENT);
+  g_type_class_ref (GIMP_TYPE_OPERATION_GROW);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HISTOGRAM_SINK);
+  g_type_class_ref (GIMP_TYPE_OPERATION_MASK_COMPONENTS);
+  g_type_class_ref (GIMP_TYPE_OPERATION_OFFSET);
+  g_type_class_ref (GIMP_TYPE_OPERATION_PROFILE_TRANSFORM);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SCALAR_MULTIPLY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SEMI_FLATTEN);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SET_ALPHA);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SHRINK);
+  g_type_class_ref (GIMP_TYPE_OPERATION_THRESHOLD_ALPHA);
+
+  g_type_class_ref (GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST);
+  g_type_class_ref (GIMP_TYPE_OPERATION_COLOR_BALANCE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_COLORIZE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_CURVES);
+  g_type_class_ref (GIMP_TYPE_OPERATION_DESATURATE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HUE_SATURATION);
+  g_type_class_ref (GIMP_TYPE_OPERATION_LEVELS);
+  g_type_class_ref (GIMP_TYPE_OPERATION_POSTERIZE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_THRESHOLD);
+
+  g_type_class_ref (GIMP_TYPE_OPERATION_NORMAL);
+  g_type_class_ref (GIMP_TYPE_OPERATION_DISSOLVE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_BEHIND);
+  g_type_class_ref (GIMP_TYPE_OPERATION_MULTIPLY_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SCREEN_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_ADDITION_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SUBTRACT_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_DARKEN_ONLY_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HSV_HUE_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_DIVIDE_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_DODGE_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_BURN_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY);
+  g_type_class_ref (GIMP_TYPE_OPERATION_ERASE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_MERGE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_SPLIT);
+  g_type_class_ref (GIMP_TYPE_OPERATION_PASS_THROUGH);
+  g_type_class_ref (GIMP_TYPE_OPERATION_REPLACE);
+  g_type_class_ref (GIMP_TYPE_OPERATION_ANTI_ERASE);
+
+  gimp_operation_config_register (gimp,
+                                  "gimp:brightness-contrast",
+                                  GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG);
+  set_compat_file (GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG,
+                   "gimp-brightness-contrast-tool.settings");
+  set_settings_folder (GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG,
+                       "brightness-contrast");
+
+  gimp_operation_config_register (gimp,
+                                  "gimp:color-balance",
+                                  GIMP_TYPE_COLOR_BALANCE_CONFIG);
+  set_compat_file (GIMP_TYPE_COLOR_BALANCE_CONFIG,
+                   "gimp-color-balance-tool.settings");
+  set_settings_folder (GIMP_TYPE_COLOR_BALANCE_CONFIG,
+                       "color-balance");
+
+  gimp_operation_config_register (gimp,
+                                  "gimp:curves",
+                                  GIMP_TYPE_CURVES_CONFIG);
+  set_compat_file (GIMP_TYPE_CURVES_CONFIG,
+                   "gimp-curves-tool.settings");
+  set_settings_folder (GIMP_TYPE_CURVES_CONFIG,
+                       "curves");
+
+  gimp_operation_config_register (gimp,
+                                  "gimp:hue-saturation",
+                                  GIMP_TYPE_HUE_SATURATION_CONFIG);
+  set_compat_file (GIMP_TYPE_HUE_SATURATION_CONFIG,
+                   "gimp-hue-saturation-tool.settings");
+  set_settings_folder (GIMP_TYPE_HUE_SATURATION_CONFIG,
+                       "hue-saturation");
+
+  gimp_operation_config_register (gimp,
+                                  "gimp:levels",
+                                  GIMP_TYPE_LEVELS_CONFIG);
+  set_compat_file (GIMP_TYPE_LEVELS_CONFIG,
+                   "gimp-levels-tool.settings");
+  set_settings_folder (GIMP_TYPE_LEVELS_CONFIG,
+                       "levels");
+}
diff --git a/app/operations/gimp-operations.h b/app/operations/gimp-operations.h
new file mode 100644
index 0000000..6f2b222
--- /dev/null
+++ b/app/operations/gimp-operations.h
@@ -0,0 +1,27 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-operations.h
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATIONS_H__
+#define __GIMP_OPERATIONS_H__
+
+
+void   gimp_operations_init (Gimp *gimp);
+
+
+#endif /* __GIMP_OPERATIONS_H__ */
diff --git a/app/operations/gimpbrightnesscontrastconfig.c b/app/operations/gimpbrightnesscontrastconfig.c
new file mode 100644
index 0000000..75ee36a
--- /dev/null
+++ b/app/operations/gimpbrightnesscontrastconfig.c
@@ -0,0 +1,248 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpbrightnesscontrastconfig.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimpbrightnesscontrastconfig.h"
+#include "gimplevelsconfig.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_BRIGHTNESS,
+  PROP_CONTRAST
+};
+
+
+static void     gimp_brightness_contrast_config_iface_init   (GimpConfigInterface *iface);
+
+static void     gimp_brightness_contrast_config_get_property (GObject      *object,
+                                                              guint         property_id,
+                                                              GValue       *value,
+                                                              GParamSpec   *pspec);
+static void     gimp_brightness_contrast_config_set_property (GObject      *object,
+                                                              guint         property_id,
+                                                              const GValue *value,
+                                                              GParamSpec   *pspec);
+
+static gboolean gimp_brightness_contrast_config_equal        (GimpConfig   *a,
+                                                              GimpConfig   *b);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpBrightnessContrastConfig,
+                         gimp_brightness_contrast_config,
+                         GIMP_TYPE_OPERATION_SETTINGS,
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
+                                                gimp_brightness_contrast_config_iface_init))
+
+#define parent_class gimp_brightness_contrast_config_parent_class
+
+
+static void
+gimp_brightness_contrast_config_class_init (GimpBrightnessContrastConfigClass *klass)
+{
+  GObjectClass      *object_class   = G_OBJECT_CLASS (klass);
+  GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
+
+  object_class->set_property        = gimp_brightness_contrast_config_set_property;
+  object_class->get_property        = gimp_brightness_contrast_config_get_property;
+
+  viewable_class->default_icon_name = "gimp-tool-brightness-contrast";
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_BRIGHTNESS,
+                           "brightness",
+                           _("Brightness"),
+                           _("Brightness"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_CONTRAST,
+                           "contrast",
+                           _("Contrast"),
+                           _("Contrast"),
+                           -1.0, 1.0, 0.0, 0);
+}
+
+static void
+gimp_brightness_contrast_config_iface_init (GimpConfigInterface *iface)
+{
+  iface->equal = gimp_brightness_contrast_config_equal;
+}
+
+static void
+gimp_brightness_contrast_config_init (GimpBrightnessContrastConfig *self)
+{
+}
+
+static void
+gimp_brightness_contrast_config_get_property (GObject    *object,
+                                              guint       property_id,
+                                              GValue     *value,
+                                              GParamSpec *pspec)
+{
+  GimpBrightnessContrastConfig *self = GIMP_BRIGHTNESS_CONTRAST_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_BRIGHTNESS:
+      g_value_set_double (value, self->brightness);
+      break;
+
+    case PROP_CONTRAST:
+      g_value_set_double (value, self->contrast);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_brightness_contrast_config_set_property (GObject      *object,
+                                              guint         property_id,
+                                              const GValue *value,
+                                              GParamSpec   *pspec)
+{
+  GimpBrightnessContrastConfig *self = GIMP_BRIGHTNESS_CONTRAST_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_BRIGHTNESS:
+      self->brightness = g_value_get_double (value);
+      break;
+
+    case PROP_CONTRAST:
+      self->contrast = g_value_get_double (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_brightness_contrast_config_equal (GimpConfig *a,
+                                       GimpConfig *b)
+{
+  GimpBrightnessContrastConfig *config_a = GIMP_BRIGHTNESS_CONTRAST_CONFIG (a);
+  GimpBrightnessContrastConfig *config_b = GIMP_BRIGHTNESS_CONTRAST_CONFIG (b);
+
+  if (! gimp_operation_settings_config_equal_base (a, b) ||
+      config_a->brightness != config_b->brightness       ||
+      config_a->contrast   != config_b->contrast)
+    {
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+GimpLevelsConfig *
+gimp_brightness_contrast_config_to_levels_config (GimpBrightnessContrastConfig *config)
+{
+  GimpLevelsConfig *levels;
+  gdouble           brightness;
+  gdouble           slant;
+  gdouble           value;
+
+  g_return_val_if_fail (GIMP_IS_BRIGHTNESS_CONTRAST_CONFIG (config), NULL);
+
+  levels = g_object_new (GIMP_TYPE_LEVELS_CONFIG, NULL);
+
+  gimp_operation_settings_config_copy_base (GIMP_CONFIG (config),
+                                            GIMP_CONFIG (levels),
+                                            0);
+
+  brightness = config->brightness / 2.0;
+  slant = tan ((config->contrast + 1) * G_PI_4);
+
+  if (config->brightness >= 0)
+    {
+      value = -0.5 * slant + brightness * slant + 0.5;
+
+      if (value < 0.0)
+        {
+          value = 0.0;
+
+          /* this slightly convoluted math follows by inverting the
+           * calculation of the brightness/contrast LUT in base/lut-funcs.h */
+
+          levels->low_input[GIMP_HISTOGRAM_VALUE] =
+            (- brightness * slant + 0.5 * slant - 0.5) / (slant - brightness * slant);
+        }
+
+      levels->low_output[GIMP_HISTOGRAM_VALUE] = value;
+
+      value = 0.5 * slant + 0.5;
+
+      if (value > 1.0)
+        {
+          value = 1.0;
+
+          levels->high_input[GIMP_HISTOGRAM_VALUE] =
+            (- brightness * slant + 0.5 * slant + 0.5) / (slant - brightness * slant);
+        }
+
+      levels->high_output[GIMP_HISTOGRAM_VALUE] = value;
+    }
+  else
+    {
+      value = 0.5 - 0.5 * slant;
+
+      if (value < 0.0)
+        {
+          value = 0.0;
+
+          levels->low_input[GIMP_HISTOGRAM_VALUE] =
+            (0.5 * slant - 0.5) / (slant + brightness * slant);
+        }
+
+      levels->low_output[GIMP_HISTOGRAM_VALUE] = value;
+
+      value = slant * brightness + slant * 0.5 + 0.5;
+
+      if (value > 1.0)
+        {
+          value = 1.0;
+
+          levels->high_input[GIMP_HISTOGRAM_VALUE] =
+            (0.5 * slant + 0.5) / (slant + brightness * slant);
+        }
+
+      levels->high_output[GIMP_HISTOGRAM_VALUE] = value;
+    }
+
+  return levels;
+}
diff --git a/app/operations/gimpbrightnesscontrastconfig.h b/app/operations/gimpbrightnesscontrastconfig.h
new file mode 100644
index 0000000..bab1a03
--- /dev/null
+++ b/app/operations/gimpbrightnesscontrastconfig.h
@@ -0,0 +1,58 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpbrightnesscontrastconfig.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_BRIGHTNESS_CONTRAST_CONFIG_H__
+#define __GIMP_BRIGHTNESS_CONTRAST_CONFIG_H__
+
+
+#include "gimpoperationsettings.h"
+
+
+#define GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG            (gimp_brightness_contrast_config_get_type ())
+#define GIMP_BRIGHTNESS_CONTRAST_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG, GimpBrightnessContrastConfig))
+#define GIMP_BRIGHTNESS_CONTRAST_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG, GimpBrightnessContrastConfigClass))
+#define GIMP_IS_BRIGHTNESS_CONTRAST_CONFIG(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG))
+#define GIMP_IS_BRIGHTNESS_CONTRAST_CONFIG_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG))
+#define GIMP_BRIGHTNESS_CONTRAST_CONFIG_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG, GimpBrightnessContrastConfigClass))
+
+
+typedef struct _GimpBrightnessContrastConfigClass GimpBrightnessContrastConfigClass;
+
+struct _GimpBrightnessContrastConfig
+{
+  GimpOperationSettings  parent_instance;
+
+  gdouble                brightness;
+  gdouble                contrast;
+};
+
+struct _GimpBrightnessContrastConfigClass
+{
+  GimpOperationSettingsClass  parent_class;
+};
+
+
+GType   gimp_brightness_contrast_config_get_type (void) G_GNUC_CONST;
+
+GimpLevelsConfig *
+gimp_brightness_contrast_config_to_levels_config (GimpBrightnessContrastConfig *config);
+
+
+#endif /* __GIMP_BRIGHTNESS_CONTRAST_CONFIG_H__ */
diff --git a/app/operations/gimpcageconfig.c b/app/operations/gimpcageconfig.c
new file mode 100644
index 0000000..17548cf
--- /dev/null
+++ b/app/operations/gimpcageconfig.c
@@ -0,0 +1,832 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpcageconfig.c
+ * Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpbase/gimpbase.h"
+
+#include "operations-types.h"
+
+#include "gimpcageconfig.h"
+
+
+/*#define DEBUG_CAGE */
+
+/* This DELTA is aimed to not have handle on exact pixel during computation,
+ * to avoid particular case. It shouldn't be so useful, but it's a double
+ * safety. */
+#define DELTA             0.010309278351
+
+
+static void   gimp_cage_config_finalize               (GObject        *object);
+static void   gimp_cage_config_get_property           (GObject        *object,
+                                                       guint           property_id,
+                                                       GValue         *value,
+                                                       GParamSpec     *pspec);
+static void   gimp_cage_config_set_property           (GObject        *object,
+                                                       guint           property_id,
+                                                       const GValue   *value,
+                                                       GParamSpec     *pspec);
+
+static void   gimp_cage_config_compute_scaling_factor (GimpCageConfig *gcc);
+static void   gimp_cage_config_compute_edges_normal   (GimpCageConfig *gcc);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpCageConfig, gimp_cage_config,
+                         GIMP_TYPE_OPERATION_SETTINGS,
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
+                                                NULL))
+
+#define parent_class gimp_cage_config_parent_class
+
+#ifdef DEBUG_CAGE
+static void
+print_cage (GimpCageConfig *gcc)
+{
+  gint i;
+  GeglRectangle bounding_box;
+  GimpCagePoint *point;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  bounding_box = gimp_cage_config_get_bounding_box (gcc);
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
+      g_printerr ("cgx: %.0f    cgy: %.0f    cvdx: %.0f    cvdy: %.0f  sf: %.2f  normx: %.2f  normy: %.2f %s\n",
+                  point->src_point.x + ((gcc->cage_mode==GIMP_CAGE_MODE_CAGE_CHANGE)?gcc->displacement_x:0),
+                  point->src_point.y + ((gcc->cage_mode==GIMP_CAGE_MODE_CAGE_CHANGE)?gcc->displacement_y:0),
+                  point->dest_point.x + ((gcc->cage_mode==GIMP_CAGE_MODE_DEFORM)?gcc->displacement_x:0),
+                  point->dest_point.y + ((gcc->cage_mode==GIMP_CAGE_MODE_DEFORM)?gcc->displacement_y:0),
+                  point->edge_scaling_factor,
+                  point->edge_normal.x,
+                  point->edge_normal.y,
+                  ((point->selected) ? "S" : "NS"));
+    }
+
+  g_printerr ("bounding box: x: %d  y: %d  width: %d  height: %d\n", bounding_box.x, bounding_box.y, bounding_box.width, bounding_box.height);
+  g_printerr ("disp x: %f  disp y: %f\n", gcc->displacement_x, gcc->displacement_y);
+  g_printerr ("done\n");
+}
+#endif
+
+static void
+gimp_cage_config_class_init (GimpCageConfigClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->set_property = gimp_cage_config_set_property;
+  object_class->get_property = gimp_cage_config_get_property;
+
+  object_class->finalize     = gimp_cage_config_finalize;
+}
+
+static void
+gimp_cage_config_init (GimpCageConfig *self)
+{
+  /*pre-allocation for 50 vertices for the cage.*/
+  self->cage_points = g_array_sized_new (FALSE, FALSE, sizeof(GimpCagePoint), 50);
+}
+
+static void
+gimp_cage_config_finalize (GObject *object)
+{
+  GimpCageConfig *gcc = GIMP_CAGE_CONFIG (object);
+
+  g_array_free (gcc->cage_points, TRUE);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_cage_config_get_property (GObject    *object,
+                               guint       property_id,
+                               GValue     *value,
+                               GParamSpec *pspec)
+{
+  switch (property_id)
+    {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_cage_config_set_property (GObject      *object,
+                               guint         property_id,
+                               const GValue *value,
+                               GParamSpec   *pspec)
+{
+  switch (property_id)
+    {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+/**
+ * gimp_cage_config_get_n_points:
+ * @gcc: the cage config
+ *
+ * Returns: the number of points of the cage
+ */
+guint
+gimp_cage_config_get_n_points (GimpCageConfig *gcc)
+{
+  return gcc->cage_points->len;
+}
+
+/**
+ * gimp_cage_config_add_cage_point:
+ * @gcc: the cage config
+ * @x: x value of the new point
+ * @y: y value of the new point
+ *
+ * Add a new point in the last index of the polygon of the cage.
+ * Point is added in both source and destination cage
+ */
+void
+gimp_cage_config_add_cage_point (GimpCageConfig  *gcc,
+                                 gdouble          x,
+                                 gdouble          y)
+{
+  gimp_cage_config_insert_cage_point (gcc, gcc->cage_points->len, x, y);
+}
+
+/**
+ * gimp_cage_config_insert_cage_point:
+ * @gcc: the cage config
+ * @point_number: index where the point will be inserted
+ * @x: x value of the new point
+ * @y: y value of the new point
+ *
+ * Insert a new point in the polygon of the cage at the given index.
+ * Point is added in both source and destination cage
+ */
+void
+gimp_cage_config_insert_cage_point (GimpCageConfig  *gcc,
+                                    gint             point_number,
+                                    gdouble          x,
+                                    gdouble          y)
+{
+  GimpCagePoint point;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+  g_return_if_fail (point_number <= gcc->cage_points->len);
+  g_return_if_fail (point_number >= 0);
+
+  point.src_point.x = x + DELTA;
+  point.src_point.y = y + DELTA;
+
+  point.dest_point.x = x + DELTA;
+  point.dest_point.y = y + DELTA;
+
+  g_array_insert_val (gcc->cage_points, point_number, point);
+
+  gimp_cage_config_compute_scaling_factor (gcc);
+  gimp_cage_config_compute_edges_normal (gcc);
+}
+
+/**
+ * gimp_cage_config_remove_last_cage_point:
+ * @gcc: the cage config
+ *
+ * Remove the last point of the cage, in both source and destination cage
+ */
+void
+gimp_cage_config_remove_last_cage_point (GimpCageConfig  *gcc)
+{
+  gimp_cage_config_remove_cage_point (gcc, gcc->cage_points->len - 1);
+}
+
+/**
+ * gimp_cage_config_remove_cage_point:
+ * @gcc: the cage config
+ * @point_number: the index of the point to remove
+ *
+ * Remove the given point from the cage
+ */
+void
+gimp_cage_config_remove_cage_point (GimpCageConfig *gcc,
+                                    gint            point_number)
+{
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+  g_return_if_fail (point_number < gcc->cage_points->len);
+  g_return_if_fail (point_number >= 0);
+
+  if (gcc->cage_points->len > 0)
+    g_array_remove_index (gcc->cage_points, gcc->cage_points->len - 1);
+
+  gimp_cage_config_compute_scaling_factor (gcc);
+  gimp_cage_config_compute_edges_normal (gcc);
+}
+
+/**
+ * gimp_cage_config_remove_selected_points:
+ * @gcc: the cage config
+ *
+ * Remove all the selected points from the cage
+ */
+void
+gimp_cage_config_remove_selected_points (GimpCageConfig  *gcc)
+{
+  gint           i;
+  GimpCagePoint *point;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
+
+      if (point->selected)
+        {
+          g_array_remove_index (gcc->cage_points, i);
+          i--;
+        }
+    }
+
+  gimp_cage_config_compute_scaling_factor (gcc);
+  gimp_cage_config_compute_edges_normal (gcc);
+}
+
+/**
+ * gimp_cage_config_get_point_coordinate:
+ * @gcc: the cage config
+ * @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
+ * @point_number: the index of the point to return
+ *
+ * Returns: the real position of the given point, as a GimpVector2
+ */
+GimpVector2
+gimp_cage_config_get_point_coordinate (GimpCageConfig *gcc,
+                                       GimpCageMode    mode,
+                                       gint            point_number)
+{
+  GimpVector2     result = { 0.0, 0.0 };
+  GimpCagePoint  *point;
+
+  g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), result);
+  g_return_val_if_fail (point_number < gcc->cage_points->len, result);
+  g_return_val_if_fail (point_number >= 0, result);
+
+  point = &g_array_index (gcc->cage_points, GimpCagePoint, point_number);
+
+  if (point->selected)
+    {
+      if (mode == GIMP_CAGE_MODE_CAGE_CHANGE)
+        {
+          result.x = point->src_point.x + gcc->displacement_x;
+          result.y = point->src_point.y + gcc->displacement_y;
+        }
+      else
+        {
+          result.x = point->dest_point.x + gcc->displacement_x;
+          result.y = point->dest_point.y + gcc->displacement_y;
+        }
+    }
+  else
+    {
+      if (mode == GIMP_CAGE_MODE_CAGE_CHANGE)
+        {
+          result.x = point->src_point.x;
+          result.y = point->src_point.y;
+        }
+      else
+        {
+          result.x = point->dest_point.x;
+          result.y = point->dest_point.y;
+        }
+    }
+
+  return result;
+}
+
+/**
+ * gimp_cage_config_add_displacement:
+ * @gcc: the cage config
+ * @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
+ * @point_number: the point of the cage to move
+ * @x: x displacement value
+ * @y: y displacement value
+ *
+ * Add a displacement for all selected points of the cage.
+ * This displacement need to be committed to become effective.
+ */
+void
+gimp_cage_config_add_displacement (GimpCageConfig *gcc,
+                                   GimpCageMode    mode,
+                                   gdouble         x,
+                                   gdouble         y)
+{
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  gcc->cage_mode = mode;
+  gcc->displacement_x = x;
+  gcc->displacement_y = y;
+
+  #ifdef DEBUG_CAGE
+    print_cage (gcc);
+  #endif
+}
+
+/**
+ * gimp_cage_config_commit_displacement:
+ * @gcc: the cage config
+ *
+ * Apply the displacement to the cage
+ */
+void
+gimp_cage_config_commit_displacement (GimpCageConfig *gcc)
+{
+  gint  i;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      GimpCagePoint *point;
+      point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
+
+      if (point->selected)
+        {
+          if (gcc->cage_mode == GIMP_CAGE_MODE_CAGE_CHANGE)
+            {
+              point->src_point.x += gcc->displacement_x;
+              point->src_point.y += gcc->displacement_y;
+              point->dest_point.x += gcc->displacement_x;
+              point->dest_point.y += gcc->displacement_y;
+            }
+          else
+            {
+              point->dest_point.x += gcc->displacement_x;
+              point->dest_point.y += gcc->displacement_y;
+            }
+        }
+    }
+
+  gimp_cage_config_compute_scaling_factor (gcc);
+  gimp_cage_config_compute_edges_normal (gcc);
+  gimp_cage_config_reset_displacement (gcc);
+}
+
+/**
+ * gimp_cage_config_reset_displacement:
+ * @gcc: the cage config
+ *
+ * Set the displacement to zero.
+ */
+void
+gimp_cage_config_reset_displacement (GimpCageConfig *gcc)
+{
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  gcc->displacement_x = 0.0;
+  gcc->displacement_y = 0.0;
+}
+
+/**
+ * gimp_cage_config_get_bounding_box:
+ * @gcc: the cage config
+ *
+ * Compute the bounding box of the source cage
+ *
+ * Returns: the bounding box of the source cage, as a GeglRectangle
+ */
+GeglRectangle
+gimp_cage_config_get_bounding_box (GimpCageConfig *gcc)
+{
+  GeglRectangle  bounding_box = { 0, 0, 0, 0};
+  gint           i;
+  GimpCagePoint *point;
+
+  g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), bounding_box);
+
+  if (gcc->cage_points->len == 0)
+    return bounding_box;
+
+  point = &g_array_index (gcc->cage_points, GimpCagePoint, 0);
+
+  if (point->selected)
+    {
+      bounding_box.x = point->src_point.x + gcc->displacement_x;
+      bounding_box.y = point->src_point.y + gcc->displacement_y;
+    }
+  else
+    {
+      bounding_box.x = point->src_point.x;
+      bounding_box.y = point->src_point.y;
+    }
+
+  for (i = 1; i < gcc->cage_points->len; i++)
+    {
+      gdouble x,y;
+      point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
+
+      if (point->selected)
+        {
+          x = point->src_point.x + gcc->displacement_x;
+          y = point->src_point.y + gcc->displacement_y;
+        }
+      else
+        {
+          x = point->src_point.x;
+          y = point->src_point.y;
+        }
+
+      if (x < bounding_box.x)
+        {
+          bounding_box.width += bounding_box.x - x;
+          bounding_box.x = x;
+        }
+
+      if (y < bounding_box.y)
+        {
+          bounding_box.height += bounding_box.y - y;
+          bounding_box.y = y;
+        }
+
+      if (x > bounding_box.x + bounding_box.width)
+        {
+          bounding_box.width = x - bounding_box.x;
+        }
+
+      if (y > bounding_box.y + bounding_box.height)
+        {
+          bounding_box.height = y - bounding_box.y;
+        }
+    }
+
+  return bounding_box;
+}
+
+/**
+ * gimp_cage_config_reverse_cage:
+ * @gcc: the cage config
+ *
+ * When using non-simple cage (like a cage in 8), user may want to
+ * manually inverse inside and outside of the cage. This function
+ * reverse the cage
+ */
+void
+gimp_cage_config_reverse_cage (GimpCageConfig *gcc)
+{
+  GimpCagePoint temp;
+  gint          i;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  for (i = 0; i < gcc->cage_points->len / 2; i++)
+    {
+      temp = g_array_index (gcc->cage_points, GimpCagePoint, i);
+
+      g_array_index (gcc->cage_points, GimpCagePoint, i) =
+        g_array_index (gcc->cage_points, GimpCagePoint, gcc->cage_points->len - i - 1);
+
+      g_array_index (gcc->cage_points, GimpCagePoint, gcc->cage_points->len - i - 1) = temp;
+    }
+
+  gimp_cage_config_compute_scaling_factor (gcc);
+  gimp_cage_config_compute_edges_normal (gcc);
+}
+
+/**
+ * gimp_cage_config_reverse_cage_if_needed:
+ * @gcc: the cage config
+ *
+ * Since the cage need to be defined counter-clockwise to have the
+ * topological inside in the actual 'physical' inside of the cage,
+ * this function compute if the cage is clockwise or not, and reverse
+ * the cage if needed.
+ *
+ * This function does not take into account an eventual displacement
+ */
+void
+gimp_cage_config_reverse_cage_if_needed (GimpCageConfig *gcc)
+{
+  gint    i;
+  gdouble sum;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  sum = 0.0;
+
+  /* this is a bit crappy, but should works most of the case */
+  /* we do the sum of the projection of each point to the previous
+     segment, and see the final sign */
+  for (i = 0; i < gcc->cage_points->len ; i++)
+    {
+      GimpVector2 P1, P2, P3;
+      gdouble     z;
+
+      P1 = (g_array_index (gcc->cage_points, GimpCagePoint, i)).src_point;
+      P2 = (g_array_index (gcc->cage_points, GimpCagePoint, (i+1) % gcc->cage_points->len)).src_point;
+      P3 = (g_array_index (gcc->cage_points, GimpCagePoint, (i+2) % gcc->cage_points->len)).src_point;
+
+      z = P1.x * (P2.y - P3.y) + P2.x * (P3.y - P1.y) + P3.x * (P1.y - P2.y);
+
+      sum += z;
+    }
+
+  /* sum > 0 mean a cage defined counter-clockwise, so we reverse it */
+  if (sum > 0)
+    {
+      gimp_cage_config_reverse_cage (gcc);
+    }
+}
+
+/**
+ * gimp_cage_config_compute_scaling_factor:
+ * @gcc: the cage config
+ *
+ * Update Green Coordinate scaling factor for the destination cage.
+ * This function does not take into account an eventual displacement.
+ */
+static void
+gimp_cage_config_compute_scaling_factor (GimpCageConfig *gcc)
+{
+  GimpVector2    edge;
+  gdouble        length, length_d;
+  gint           i;
+  GimpCagePoint *current, *last;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+  if (gcc->cage_points->len < 2)
+    return;
+
+  last = &g_array_index (gcc->cage_points, GimpCagePoint, 0);
+
+  for (i = 1; i <= gcc->cage_points->len; i++)
+    {
+      current = &g_array_index (gcc->cage_points, GimpCagePoint, i % gcc->cage_points->len);
+
+      gimp_vector2_sub (&edge,
+                        &(last->src_point),
+                        &(current->src_point));
+      length = gimp_vector2_length (&edge);
+
+      gimp_vector2_sub (&edge,
+                        &(last->dest_point),
+                        &(current->dest_point));
+      length_d = gimp_vector2_length (&edge);
+
+      last->edge_scaling_factor = length_d / length;
+      last = current;
+    }
+}
+
+/**
+ * gimp_cage_config_compute_edges_normal:
+ * @gcc: the cage config
+ *
+ * Update edges normal for the destination cage.
+ * This function does not take into account an eventual displacement.
+ */
+static void
+gimp_cage_config_compute_edges_normal (GimpCageConfig *gcc)
+{
+  GimpVector2    normal;
+  gint           i;
+  GimpCagePoint *current, *last;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  last = &g_array_index (gcc->cage_points, GimpCagePoint, 0);
+
+  for (i = 1; i <= gcc->cage_points->len; i++)
+    {
+      current = &g_array_index (gcc->cage_points, GimpCagePoint, i % gcc->cage_points->len);
+
+      gimp_vector2_sub (&normal,
+                        &(current->dest_point),
+                        &(last->dest_point));
+
+      last->edge_normal = gimp_vector2_normal (&normal);
+      last = current;
+    }
+}
+
+/**
+ * gimp_cage_config_point_inside:
+ * @gcc: the cage config
+ * @x: x coordinate of the point to test
+ * @y: y coordinate of the point to test
+ *
+ * Check if the given point is inside the cage. This test is done in
+ * the regard of the topological inside of the source cage.
+ *
+ * Returns: TRUE if the point is inside, FALSE if not.
+ * This function does not take into account an eventual displacement.
+ */
+gboolean
+gimp_cage_config_point_inside (GimpCageConfig *gcc,
+                               gfloat          x,
+                               gfloat          y)
+{
+  GimpVector2   *last, *current;
+  gboolean       inside = FALSE;
+  gint           i;
+
+  g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), FALSE);
+
+  last = &((g_array_index (gcc->cage_points, GimpCagePoint, gcc->cage_points->len - 1)).src_point);
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      current = &((g_array_index (gcc->cage_points, GimpCagePoint, i)).src_point);
+
+      if ((((current->y <= y) && (y < last->y))
+           || ((last->y <= y) && (y < current->y)))
+          && (x < (last->x - current->x) * (y - current->y) / (last->y - current->y) + current->x))
+        {
+          inside = !inside;
+        }
+
+      last = current;
+    }
+
+  return inside;
+}
+
+/**
+ * gimp_cage_config_select_point:
+ * @gcc: the cage config
+ * @point_number: the index of the point to select
+ *
+ * Select the given point of the cage, and deselect the others.
+ */
+void
+gimp_cage_config_select_point (GimpCageConfig  *gcc,
+                               gint             point_number)
+{
+  gint           i;
+  GimpCagePoint *point;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+  g_return_if_fail (point_number < gcc->cage_points->len);
+  g_return_if_fail (point_number >= 0);
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
+
+      if (i == point_number)
+        {
+          point->selected = TRUE;
+        }
+      else
+        {
+          point->selected = FALSE;
+        }
+    }
+}
+
+/**
+ * gimp_cage_config_select_area:
+ * @gcc: the cage config
+ * @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
+ * @area: the area to select
+ *
+ * Select cage's point inside the given area and deselect others
+ */
+void
+gimp_cage_config_select_area  (GimpCageConfig  *gcc,
+                               GimpCageMode     mode,
+                               GeglRectangle    area)
+{
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  gimp_cage_config_deselect_points (gcc);
+  gimp_cage_config_select_add_area (gcc, mode, area);
+}
+
+/**
+ * gimp_cage_config_select_add_area:
+ * @gcc: the cage config
+ * @mode: the actual mode of the cage, GIMP_CAGE_MODE_CAGE_CHANGE or GIMP_CAGE_MODE_DEFORM
+ * @area: the area to select
+ *
+ * Select cage's point inside the given area. Already selected point stay selected.
+ */
+void
+gimp_cage_config_select_add_area (GimpCageConfig *gcc,
+                                  GimpCageMode    mode,
+                                  GeglRectangle   area)
+{
+  gint           i;
+  GimpCagePoint *point;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      point = &g_array_index (gcc->cage_points, GimpCagePoint, i);
+
+      if (mode == GIMP_CAGE_MODE_CAGE_CHANGE)
+        {
+          if (point->src_point.x >= area.x &&
+              point->src_point.x <= area.x + area.width &&
+              point->src_point.y >= area.y &&
+              point->src_point.y <= area.y + area.height)
+            {
+              point->selected = TRUE;
+            }
+        }
+      else
+        {
+          if (point->dest_point.x >= area.x &&
+              point->dest_point.x <= area.x + area.width &&
+              point->dest_point.y >= area.y &&
+              point->dest_point.y <= area.y + area.height)
+            {
+              point->selected = TRUE;
+            }
+        }
+    }
+}
+
+/**
+ * gimp_cage_config_toggle_point_selection:
+ * @gcc: the cage config
+ * @point_number: the index of the point to toggle selection
+ *
+ * Toggle the selection of the given cage point
+ */
+void
+gimp_cage_config_toggle_point_selection (GimpCageConfig *gcc,
+                                         gint            point_number)
+{
+  GimpCagePoint *point;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+  g_return_if_fail (point_number < gcc->cage_points->len);
+  g_return_if_fail (point_number >= 0);
+
+  point = &g_array_index (gcc->cage_points, GimpCagePoint, point_number);
+  point->selected = ! point->selected;
+}
+
+/**
+ * gimp_cage_deselect_points:
+ * @gcc: the cage config
+ *
+ * Deselect all cage points.
+ */
+void
+gimp_cage_config_deselect_points (GimpCageConfig *gcc)
+{
+  gint  i;
+
+  g_return_if_fail (GIMP_IS_CAGE_CONFIG (gcc));
+
+  for (i = 0; i < gcc->cage_points->len; i++)
+    {
+      (g_array_index (gcc->cage_points, GimpCagePoint, i)).selected = FALSE;
+    }
+}
+
+/**
+ * gimp_cage_config_point_is_selected:
+ * @gcc: the cage config
+ * @point_number: the index of the point to test
+ *
+ * Returns: TRUE if the point is selected, FALSE otherwise.
+ */
+gboolean
+gimp_cage_config_point_is_selected (GimpCageConfig  *gcc,
+                                    gint             point_number)
+{
+  GimpCagePoint *point;
+
+  g_return_val_if_fail (GIMP_IS_CAGE_CONFIG (gcc), FALSE);
+  g_return_val_if_fail (point_number < gcc->cage_points->len, FALSE);
+  g_return_val_if_fail (point_number >= 0, FALSE);
+
+  point = &(g_array_index (gcc->cage_points, GimpCagePoint, point_number));
+
+  return point->selected;
+}
diff --git a/app/operations/gimpcageconfig.h b/app/operations/gimpcageconfig.h
new file mode 100644
index 0000000..8106d52
--- /dev/null
+++ b/app/operations/gimpcageconfig.h
@@ -0,0 +1,108 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpcageconfig.h
+ * Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_CAGE_CONFIG_H__
+#define __GIMP_CAGE_CONFIG_H__
+
+
+#include "gimpoperationsettings.h"
+
+
+struct _GimpCagePoint
+{
+  GimpVector2 src_point;
+  GimpVector2 dest_point;
+  GimpVector2 edge_normal;
+  gdouble     edge_scaling_factor;
+  gboolean    selected;
+};
+
+
+#define GIMP_TYPE_CAGE_CONFIG            (gimp_cage_config_get_type ())
+#define GIMP_CAGE_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CAGE_CONFIG, GimpCageConfig))
+#define GIMP_CAGE_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CAGE_CONFIG, GimpCageConfigClass))
+#define GIMP_IS_CAGE_CONFIG(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CAGE_CONFIG))
+#define GIMP_IS_CAGE_CONFIG_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CAGE_CONFIG))
+#define GIMP_CAGE_CONFIG_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CAGE_CONFIG, GimpCageConfigClass))
+
+
+typedef struct _GimpCageConfigClass GimpCageConfigClass;
+
+struct _GimpCageConfig
+{
+  GimpOperationSettings  parent_instance;
+
+  GArray                *cage_points;
+
+  gdouble                displacement_x;
+  gdouble                displacement_y;
+  GimpCageMode           cage_mode;  /* Cage mode, used to commit displacement */
+};
+
+struct _GimpCageConfigClass
+{
+  GimpOperationSettingsClass  parent_class;
+};
+
+
+GType           gimp_cage_config_get_type               (void) G_GNUC_CONST;
+
+guint           gimp_cage_config_get_n_points           (GimpCageConfig  *gcc);
+void            gimp_cage_config_add_cage_point         (GimpCageConfig  *gcc,
+                                                         gdouble          x,
+                                                         gdouble          y);
+void            gimp_cage_config_insert_cage_point      (GimpCageConfig  *gcc,
+                                                         gint             point_number,
+                                                         gdouble          x,
+                                                         gdouble          y);
+void            gimp_cage_config_remove_last_cage_point (GimpCageConfig  *gcc);
+void            gimp_cage_config_remove_cage_point      (GimpCageConfig  *gcc,
+                                                         gint             point_number);
+void            gimp_cage_config_remove_selected_points (GimpCageConfig  *gcc);
+GimpVector2     gimp_cage_config_get_point_coordinate   (GimpCageConfig  *gcc,
+                                                         GimpCageMode     mode,
+                                                         gint             point_number);
+void            gimp_cage_config_add_displacement       (GimpCageConfig  *gcc,
+                                                         GimpCageMode     mode,
+                                                         gdouble          x,
+                                                         gdouble          y);
+void            gimp_cage_config_commit_displacement    (GimpCageConfig  *gcc);
+void            gimp_cage_config_reset_displacement     (GimpCageConfig  *gcc);
+GeglRectangle   gimp_cage_config_get_bounding_box       (GimpCageConfig  *gcc);
+void            gimp_cage_config_reverse_cage_if_needed (GimpCageConfig  *gcc);
+void            gimp_cage_config_reverse_cage           (GimpCageConfig  *gcc);
+gboolean        gimp_cage_config_point_inside           (GimpCageConfig  *gcc,
+                                                         gfloat           x,
+                                                         gfloat           y);
+void            gimp_cage_config_select_point           (GimpCageConfig  *gcc,
+                                                         gint             point_number);
+void            gimp_cage_config_select_area            (GimpCageConfig  *gcc,
+                                                         GimpCageMode     mode,
+                                                         GeglRectangle    area);
+void            gimp_cage_config_select_add_area        (GimpCageConfig  *gcc,
+                                                         GimpCageMode     mode,
+                                                         GeglRectangle    area);
+void            gimp_cage_config_toggle_point_selection (GimpCageConfig  *gcc,
+                                                         gint             point_number);
+void            gimp_cage_config_deselect_points        (GimpCageConfig  *gcc);
+gboolean        gimp_cage_config_point_is_selected      (GimpCageConfig  *gcc,
+                                                         gint             point_number);
+
+
+#endif /* __GIMP_CAGE_CONFIG_H__ */
diff --git a/app/operations/gimpcolorbalanceconfig.c b/app/operations/gimpcolorbalanceconfig.c
new file mode 100644
index 0000000..7011a86
--- /dev/null
+++ b/app/operations/gimpcolorbalanceconfig.c
@@ -0,0 +1,382 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcolorbalanceconfig.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimpcolorbalanceconfig.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_RANGE,
+  PROP_CYAN_RED,
+  PROP_MAGENTA_GREEN,
+  PROP_YELLOW_BLUE,
+  PROP_PRESERVE_LUMINOSITY
+};
+
+
+static void     gimp_color_balance_config_iface_init   (GimpConfigInterface *iface);
+
+static void     gimp_color_balance_config_get_property (GObject          *object,
+                                                        guint             property_id,
+                                                        GValue           *value,
+                                                        GParamSpec       *pspec);
+static void     gimp_color_balance_config_set_property (GObject          *object,
+                                                        guint             property_id,
+                                                        const GValue     *value,
+                                                        GParamSpec       *pspec);
+
+static gboolean gimp_color_balance_config_serialize    (GimpConfig       *config,
+                                                        GimpConfigWriter *writer,
+                                                        gpointer          data);
+static gboolean gimp_color_balance_config_deserialize  (GimpConfig       *config,
+                                                        GScanner         *scanner,
+                                                        gint              nest_level,
+                                                        gpointer          data);
+static gboolean gimp_color_balance_config_equal        (GimpConfig       *a,
+                                                        GimpConfig       *b);
+static void     gimp_color_balance_config_reset        (GimpConfig       *config);
+static gboolean gimp_color_balance_config_copy         (GimpConfig       *src,
+                                                        GimpConfig       *dest,
+                                                        GParamFlags       flags);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpColorBalanceConfig, gimp_color_balance_config,
+                         GIMP_TYPE_OPERATION_SETTINGS,
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
+                                                gimp_color_balance_config_iface_init))
+
+#define parent_class gimp_color_balance_config_parent_class
+
+
+static void
+gimp_color_balance_config_class_init (GimpColorBalanceConfigClass *klass)
+{
+  GObjectClass      *object_class   = G_OBJECT_CLASS (klass);
+  GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
+
+  object_class->set_property        = gimp_color_balance_config_set_property;
+  object_class->get_property        = gimp_color_balance_config_get_property;
+
+  viewable_class->default_icon_name = "gimp-tool-color-balance";
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_RANGE,
+                         "range",
+                         _("Range"),
+                         _("The affected range"),
+                         GIMP_TYPE_TRANSFER_MODE,
+                         GIMP_TRANSFER_MIDTONES, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_CYAN_RED,
+                           "cyan-red",
+                           _("Cyan-Red"),
+                           _("Cyan-Red"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_MAGENTA_GREEN,
+                           "magenta-green",
+                           _("Magenta-Green"),
+                           _("Magenta-Green"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_YELLOW_BLUE,
+                           "yellow-blue",
+                           _("Yellow-Blue"),
+                           _("Yellow-Blue"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_PRESERVE_LUMINOSITY,
+                            "preserve-luminosity",
+                            _("Preserve Luminosity"),
+                            _("Preserve Luminosity"),
+                            TRUE, 0);
+}
+
+static void
+gimp_color_balance_config_iface_init (GimpConfigInterface *iface)
+{
+  iface->serialize   = gimp_color_balance_config_serialize;
+  iface->deserialize = gimp_color_balance_config_deserialize;
+  iface->equal       = gimp_color_balance_config_equal;
+  iface->reset       = gimp_color_balance_config_reset;
+  iface->copy        = gimp_color_balance_config_copy;
+}
+
+static void
+gimp_color_balance_config_init (GimpColorBalanceConfig *self)
+{
+  gimp_config_reset (GIMP_CONFIG (self));
+}
+
+static void
+gimp_color_balance_config_get_property (GObject    *object,
+                                        guint       property_id,
+                                        GValue     *value,
+                                        GParamSpec *pspec)
+{
+  GimpColorBalanceConfig *self = GIMP_COLOR_BALANCE_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_RANGE:
+      g_value_set_enum (value, self->range);
+      break;
+
+    case PROP_CYAN_RED:
+      g_value_set_double (value, self->cyan_red[self->range]);
+      break;
+
+    case PROP_MAGENTA_GREEN:
+      g_value_set_double (value, self->magenta_green[self->range]);
+      break;
+
+    case PROP_YELLOW_BLUE:
+      g_value_set_double (value, self->yellow_blue[self->range]);
+      break;
+
+    case PROP_PRESERVE_LUMINOSITY:
+      g_value_set_boolean (value, self->preserve_luminosity);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_color_balance_config_set_property (GObject      *object,
+                                        guint         property_id,
+                                        const GValue *value,
+                                        GParamSpec   *pspec)
+{
+  GimpColorBalanceConfig *self = GIMP_COLOR_BALANCE_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_RANGE:
+      self->range = g_value_get_enum (value);
+      g_object_notify (object, "cyan-red");
+      g_object_notify (object, "magenta-green");
+      g_object_notify (object, "yellow-blue");
+      break;
+
+    case PROP_CYAN_RED:
+      self->cyan_red[self->range] = g_value_get_double (value);
+      break;
+
+    case PROP_MAGENTA_GREEN:
+      self->magenta_green[self->range] = g_value_get_double (value);
+      break;
+
+    case PROP_YELLOW_BLUE:
+      self->yellow_blue[self->range] = g_value_get_double (value);
+      break;
+
+    case PROP_PRESERVE_LUMINOSITY:
+      self->preserve_luminosity = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_color_balance_config_serialize (GimpConfig       *config,
+                                     GimpConfigWriter *writer,
+                                     gpointer          data)
+{
+  GimpColorBalanceConfig *bc_config = GIMP_COLOR_BALANCE_CONFIG (config);
+  GimpTransferMode        range;
+  GimpTransferMode        old_range;
+  gboolean                success = TRUE;
+
+  if (! gimp_operation_settings_config_serialize_base (config, writer, data))
+    return FALSE;
+
+  old_range = bc_config->range;
+
+  for (range = GIMP_TRANSFER_SHADOWS;
+       range <= GIMP_TRANSFER_HIGHLIGHTS;
+       range++)
+    {
+      bc_config->range = range;
+
+      success = (gimp_config_serialize_property_by_name (config,
+                                                         "range",
+                                                         writer) &&
+                 gimp_config_serialize_property_by_name (config,
+                                                         "cyan-red",
+                                                         writer) &&
+                 gimp_config_serialize_property_by_name (config,
+                                                         "magenta-green",
+                                                         writer) &&
+                 gimp_config_serialize_property_by_name (config,
+                                                         "yellow-blue",
+                                                         writer));
+
+      if (! success)
+        break;
+    }
+
+  if (success)
+    success = gimp_config_serialize_property_by_name (config,
+                                                      "preserve-luminosity",
+                                                      writer);
+
+  bc_config->range = old_range;
+
+  return success;
+}
+
+static gboolean
+gimp_color_balance_config_deserialize (GimpConfig *config,
+                                       GScanner   *scanner,
+                                       gint        nest_level,
+                                       gpointer    data)
+{
+  GimpColorBalanceConfig *cb_config = GIMP_COLOR_BALANCE_CONFIG (config);
+  GimpTransferMode        old_range;
+  gboolean                success = TRUE;
+
+  old_range = cb_config->range;
+
+  success = gimp_config_deserialize_properties (config, scanner, nest_level);
+
+  g_object_set (config, "range", old_range, NULL);
+
+  return success;
+}
+
+static gboolean
+gimp_color_balance_config_equal (GimpConfig *a,
+                                 GimpConfig *b)
+{
+  GimpColorBalanceConfig *config_a = GIMP_COLOR_BALANCE_CONFIG (a);
+  GimpColorBalanceConfig *config_b = GIMP_COLOR_BALANCE_CONFIG (b);
+  GimpTransferMode        range;
+
+  if (! gimp_operation_settings_config_equal_base (a, b))
+    return FALSE;
+
+  for (range = GIMP_TRANSFER_SHADOWS;
+       range <= GIMP_TRANSFER_HIGHLIGHTS;
+       range++)
+    {
+      if (config_a->cyan_red[range]      != config_b->cyan_red[range]      ||
+          config_a->magenta_green[range] != config_b->magenta_green[range] ||
+          config_a->yellow_blue[range]   != config_b->yellow_blue[range])
+        return FALSE;
+    }
+
+  /* don't compare "range" */
+
+  if (config_a->preserve_luminosity != config_b->preserve_luminosity)
+    return FALSE;
+
+  return TRUE;
+}
+
+static void
+gimp_color_balance_config_reset (GimpConfig *config)
+{
+  GimpColorBalanceConfig *cb_config = GIMP_COLOR_BALANCE_CONFIG (config);
+  GimpTransferMode        range;
+
+  gimp_operation_settings_config_reset_base (config);
+
+  for (range = GIMP_TRANSFER_SHADOWS;
+       range <= GIMP_TRANSFER_HIGHLIGHTS;
+       range++)
+    {
+      cb_config->range = range;
+      gimp_color_balance_config_reset_range (cb_config);
+    }
+
+  gimp_config_reset_property (G_OBJECT (config), "range");
+  gimp_config_reset_property (G_OBJECT (config), "preserve-luminosity");
+}
+
+static gboolean
+gimp_color_balance_config_copy (GimpConfig  *src,
+                                GimpConfig  *dest,
+                                GParamFlags  flags)
+{
+  GimpColorBalanceConfig *src_config  = GIMP_COLOR_BALANCE_CONFIG (src);
+  GimpColorBalanceConfig *dest_config = GIMP_COLOR_BALANCE_CONFIG (dest);
+  GimpTransferMode        range;
+
+  if (! gimp_operation_settings_config_copy_base (src, dest, flags))
+    return FALSE;
+
+  for (range = GIMP_TRANSFER_SHADOWS;
+       range <= GIMP_TRANSFER_HIGHLIGHTS;
+       range++)
+    {
+      dest_config->cyan_red[range]      = src_config->cyan_red[range];
+      dest_config->magenta_green[range] = src_config->magenta_green[range];
+      dest_config->yellow_blue[range]   = src_config->yellow_blue[range];
+    }
+
+  g_object_notify (G_OBJECT (dest), "cyan-red");
+  g_object_notify (G_OBJECT (dest), "magenta-green");
+  g_object_notify (G_OBJECT (dest), "yellow-blue");
+
+  dest_config->range               = src_config->range;
+  dest_config->preserve_luminosity = src_config->preserve_luminosity;
+
+  g_object_notify (G_OBJECT (dest), "range");
+  g_object_notify (G_OBJECT (dest), "preserve-luminosity");
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+void
+gimp_color_balance_config_reset_range (GimpColorBalanceConfig *config)
+{
+  g_return_if_fail (GIMP_IS_COLOR_BALANCE_CONFIG (config));
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  gimp_config_reset_property (G_OBJECT (config), "cyan-red");
+  gimp_config_reset_property (G_OBJECT (config), "magenta-green");
+  gimp_config_reset_property (G_OBJECT (config), "yellow-blue");
+
+  g_object_thaw_notify (G_OBJECT (config));
+}
diff --git a/app/operations/gimpcolorbalanceconfig.h b/app/operations/gimpcolorbalanceconfig.h
new file mode 100644
index 0000000..4c58cea
--- /dev/null
+++ b/app/operations/gimpcolorbalanceconfig.h
@@ -0,0 +1,62 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcolorbalanceconfig.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_COLOR_BALANCE_CONFIG_H__
+#define __GIMP_COLOR_BALANCE_CONFIG_H__
+
+
+#include "gimpoperationsettings.h"
+
+
+#define GIMP_TYPE_COLOR_BALANCE_CONFIG            (gimp_color_balance_config_get_type ())
+#define GIMP_COLOR_BALANCE_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_COLOR_BALANCE_CONFIG, GimpColorBalanceConfig))
+#define GIMP_COLOR_BALANCE_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_COLOR_BALANCE_CONFIG, GimpColorBalanceConfigClass))
+#define GIMP_IS_COLOR_BALANCE_CONFIG(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_COLOR_BALANCE_CONFIG))
+#define GIMP_IS_COLOR_BALANCE_CONFIG_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_COLOR_BALANCE_CONFIG))
+#define GIMP_COLOR_BALANCE_CONFIG_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_COLOR_BALANCE_CONFIG, GimpColorBalanceConfigClass))
+
+
+typedef struct _GimpColorBalanceConfigClass GimpColorBalanceConfigClass;
+
+struct _GimpColorBalanceConfig
+{
+  GimpOperationSettings  parent_instance;
+
+  GimpTransferMode       range;
+
+  gdouble                cyan_red[3];
+  gdouble                magenta_green[3];
+  gdouble                yellow_blue[3];
+
+  gboolean               preserve_luminosity;
+};
+
+struct _GimpColorBalanceConfigClass
+{
+  GimpOperationSettingsClass  parent_class;
+};
+
+
+GType   gimp_color_balance_config_get_type    (void) G_GNUC_CONST;
+
+void    gimp_color_balance_config_reset_range (GimpColorBalanceConfig *config);
+
+
+#endif /* __GIMP_COLOR_BALANCE_CONFIG_H__ */
diff --git a/app/operations/gimpcurvesconfig.c b/app/operations/gimpcurvesconfig.c
new file mode 100644
index 0000000..b63bcf3
--- /dev/null
+++ b/app/operations/gimpcurvesconfig.c
@@ -0,0 +1,695 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcurvesconfig.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "core/gimp-utils.h"
+#include "core/gimpcurve.h"
+#include "core/gimphistogram.h"
+
+#include "gimpcurvesconfig.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_LINEAR,
+  PROP_CHANNEL,
+  PROP_CURVE
+};
+
+
+static void     gimp_curves_config_iface_init   (GimpConfigInterface *iface);
+
+static void     gimp_curves_config_finalize     (GObject          *object);
+static void     gimp_curves_config_get_property (GObject          *object,
+                                                 guint             property_id,
+                                                 GValue           *value,
+                                                 GParamSpec       *pspec);
+static void     gimp_curves_config_set_property (GObject          *object,
+                                                 guint             property_id,
+                                                 const GValue     *value,
+                                                 GParamSpec       *pspec);
+
+static gboolean gimp_curves_config_serialize    (GimpConfig       *config,
+                                                 GimpConfigWriter *writer,
+                                                 gpointer          data);
+static gboolean gimp_curves_config_deserialize  (GimpConfig       *config,
+                                                 GScanner         *scanner,
+                                                 gint              nest_level,
+                                                 gpointer          data);
+static gboolean gimp_curves_config_equal        (GimpConfig       *a,
+                                                 GimpConfig       *b);
+static void     gimp_curves_config_reset        (GimpConfig       *config);
+static gboolean gimp_curves_config_copy         (GimpConfig       *src,
+                                                 GimpConfig       *dest,
+                                                 GParamFlags       flags);
+
+static void     gimp_curves_config_curve_dirty  (GimpCurve        *curve,
+                                                 GimpCurvesConfig *config);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpCurvesConfig, gimp_curves_config,
+                         GIMP_TYPE_OPERATION_SETTINGS,
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
+                                                gimp_curves_config_iface_init))
+
+#define parent_class gimp_curves_config_parent_class
+
+
+static void
+gimp_curves_config_class_init (GimpCurvesConfigClass *klass)
+{
+  GObjectClass      *object_class   = G_OBJECT_CLASS (klass);
+  GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
+
+  object_class->finalize            = gimp_curves_config_finalize;
+  object_class->set_property        = gimp_curves_config_set_property;
+  object_class->get_property        = gimp_curves_config_get_property;
+
+  viewable_class->default_icon_name = "gimp-tool-curves";
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_LINEAR,
+                            "linear",
+                            _("Linear"),
+                            _("Work on linear RGB"),
+                            FALSE, 0);
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
+                         "channel",
+                         _("Channel"),
+                         _("The affected channel"),
+                         GIMP_TYPE_HISTOGRAM_CHANNEL,
+                         GIMP_HISTOGRAM_VALUE, 0);
+
+  GIMP_CONFIG_PROP_OBJECT (object_class, PROP_CURVE,
+                           "curve",
+                           _("Curve"),
+                           _("Curve"),
+                           GIMP_TYPE_CURVE,
+                           GIMP_CONFIG_PARAM_AGGREGATE);
+}
+
+static void
+gimp_curves_config_iface_init (GimpConfigInterface *iface)
+{
+  iface->serialize   = gimp_curves_config_serialize;
+  iface->deserialize = gimp_curves_config_deserialize;
+  iface->equal       = gimp_curves_config_equal;
+  iface->reset       = gimp_curves_config_reset;
+  iface->copy        = gimp_curves_config_copy;
+}
+
+static void
+gimp_curves_config_init (GimpCurvesConfig *self)
+{
+  GimpHistogramChannel channel;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      self->curve[channel] = GIMP_CURVE (gimp_curve_new ("curves config"));
+
+      g_signal_connect_object (self->curve[channel], "dirty",
+                               G_CALLBACK (gimp_curves_config_curve_dirty),
+                               self, 0);
+    }
+
+  gimp_config_reset (GIMP_CONFIG (self));
+}
+
+static void
+gimp_curves_config_finalize (GObject *object)
+{
+  GimpCurvesConfig     *self = GIMP_CURVES_CONFIG (object);
+  GimpHistogramChannel  channel;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      g_object_unref (self->curve[channel]);
+      self->curve[channel] = NULL;
+    }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_curves_config_get_property (GObject    *object,
+                                 guint       property_id,
+                                 GValue     *value,
+                                 GParamSpec *pspec)
+{
+  GimpCurvesConfig *self = GIMP_CURVES_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_LINEAR:
+      g_value_set_boolean (value, self->linear);
+      break;
+
+    case PROP_CHANNEL:
+      g_value_set_enum (value, self->channel);
+      break;
+
+    case PROP_CURVE:
+      g_value_set_object (value, self->curve[self->channel]);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_curves_config_set_property (GObject      *object,
+                                 guint         property_id,
+                                 const GValue *value,
+                                 GParamSpec   *pspec)
+{
+  GimpCurvesConfig *self = GIMP_CURVES_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_LINEAR:
+      self->linear = g_value_get_boolean (value);
+      break;
+
+    case PROP_CHANNEL:
+      self->channel = g_value_get_enum (value);
+      g_object_notify (object, "curve");
+      break;
+
+    case PROP_CURVE:
+      {
+        GimpCurve *src_curve  = g_value_get_object (value);
+        GimpCurve *dest_curve = self->curve[self->channel];
+
+        if (src_curve && dest_curve)
+          {
+            gimp_config_copy (GIMP_CONFIG (src_curve),
+                              GIMP_CONFIG (dest_curve), 0);
+          }
+      }
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_curves_config_serialize (GimpConfig       *config,
+                              GimpConfigWriter *writer,
+                              gpointer          data)
+{
+  GimpCurvesConfig     *c_config = GIMP_CURVES_CONFIG (config);
+  GimpHistogramChannel  channel;
+  GimpHistogramChannel  old_channel;
+  gboolean              success = TRUE;
+
+  if (! gimp_operation_settings_config_serialize_base (config, writer, data) ||
+      ! gimp_config_serialize_property_by_name (config, "linear", writer))
+    return FALSE;
+
+  old_channel = c_config->channel;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      c_config->channel = channel;
+
+      /*  serialize the channel properties manually (not using
+       *  gimp_config_serialize_properties()), so the parent class'
+       *  properties don't end up in the config file one per channel.
+       *  See bug #700653.
+       */
+      success =
+        (gimp_config_serialize_property_by_name (config, "channel", writer) &&
+         gimp_config_serialize_property_by_name (config, "curve",   writer));
+
+      if (! success)
+        break;
+    }
+
+  c_config->channel = old_channel;
+
+  return success;
+}
+
+static gboolean
+gimp_curves_config_deserialize (GimpConfig *config,
+                                GScanner   *scanner,
+                                gint        nest_level,
+                                gpointer    data)
+{
+  GimpCurvesConfig     *c_config = GIMP_CURVES_CONFIG (config);
+  GimpHistogramChannel  old_channel;
+  gboolean              success = TRUE;
+
+  old_channel = c_config->channel;
+
+  success = gimp_config_deserialize_properties (config, scanner, nest_level);
+
+  g_object_set (config, "channel", old_channel, NULL);
+
+  return success;
+}
+
+static gboolean
+gimp_curves_config_equal (GimpConfig *a,
+                          GimpConfig *b)
+{
+  GimpCurvesConfig     *config_a = GIMP_CURVES_CONFIG (a);
+  GimpCurvesConfig     *config_b = GIMP_CURVES_CONFIG (b);
+  GimpHistogramChannel  channel;
+
+  if (! gimp_operation_settings_config_equal_base (a, b) ||
+      config_a->linear != config_b->linear)
+    return FALSE;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      GimpCurve *curve_a = config_a->curve[channel];
+      GimpCurve *curve_b = config_b->curve[channel];
+
+      if (curve_a && curve_b)
+        {
+          if (! gimp_config_is_equal_to (GIMP_CONFIG (curve_a),
+                                         GIMP_CONFIG (curve_b)))
+            return FALSE;
+        }
+      else if (curve_a || curve_b)
+        {
+          return FALSE;
+        }
+    }
+
+  /* don't compare "channel" */
+
+  return TRUE;
+}
+
+static void
+gimp_curves_config_reset (GimpConfig *config)
+{
+  GimpCurvesConfig     *c_config = GIMP_CURVES_CONFIG (config);
+  GimpHistogramChannel  channel;
+
+  gimp_operation_settings_config_reset_base (config);
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      c_config->channel = channel;
+      gimp_curves_config_reset_channel (c_config);
+    }
+
+  gimp_config_reset_property (G_OBJECT (config), "linear");
+  gimp_config_reset_property (G_OBJECT (config), "channel");
+}
+
+static gboolean
+gimp_curves_config_copy (GimpConfig  *src,
+                         GimpConfig  *dest,
+                         GParamFlags  flags)
+{
+  GimpCurvesConfig     *src_config  = GIMP_CURVES_CONFIG (src);
+  GimpCurvesConfig     *dest_config = GIMP_CURVES_CONFIG (dest);
+  GimpHistogramChannel  channel;
+
+  if (! gimp_operation_settings_config_copy_base (src, dest, flags))
+    return FALSE;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      gimp_config_copy (GIMP_CONFIG (src_config->curve[channel]),
+                        GIMP_CONFIG (dest_config->curve[channel]),
+                        flags);
+    }
+
+  dest_config->linear  = src_config->linear;
+  dest_config->channel = src_config->channel;
+
+  g_object_notify (G_OBJECT (dest), "linear");
+  g_object_notify (G_OBJECT (dest), "channel");
+
+  return TRUE;
+}
+
+static void
+gimp_curves_config_curve_dirty (GimpCurve        *curve,
+                                GimpCurvesConfig *config)
+{
+  g_object_notify (G_OBJECT (config), "curve");
+}
+
+
+/*  public functions  */
+
+GObject *
+gimp_curves_config_new_spline (gint32         channel,
+                               const gdouble *points,
+                               gint           n_points)
+{
+  GimpCurvesConfig *config;
+  GimpCurve        *curve;
+  gint              i;
+
+  g_return_val_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
+                        channel <= GIMP_HISTOGRAM_ALPHA, NULL);
+  g_return_val_if_fail (points != NULL, NULL);
+  g_return_val_if_fail (n_points >= 2 && n_points <= 1024, NULL);
+
+  config = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);
+
+  curve = config->curve[channel];
+
+  gimp_data_freeze (GIMP_DATA (curve));
+
+  gimp_curve_set_curve_type (curve, GIMP_CURVE_SMOOTH);
+  gimp_curve_clear_points (curve);
+
+  for (i = 0; i < n_points; i++)
+    gimp_curve_add_point (curve,
+                          (gdouble) points[i * 2],
+                          (gdouble) points[i * 2 + 1]);
+
+  gimp_data_thaw (GIMP_DATA (curve));
+
+  return G_OBJECT (config);
+}
+
+GObject *
+gimp_curves_config_new_explicit (gint32         channel,
+                                 const gdouble *samples,
+                                 gint           n_samples)
+{
+  GimpCurvesConfig *config;
+  GimpCurve        *curve;
+  gint              i;
+
+  g_return_val_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
+                        channel <= GIMP_HISTOGRAM_ALPHA, NULL);
+  g_return_val_if_fail (samples != NULL, NULL);
+  g_return_val_if_fail (n_samples >= 2 && n_samples <= 4096, NULL);
+
+  config = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);
+
+  curve = config->curve[channel];
+
+  gimp_data_freeze (GIMP_DATA (curve));
+
+  gimp_curve_set_curve_type (curve, GIMP_CURVE_FREE);
+  gimp_curve_set_n_samples (curve, n_samples);
+
+  for (i = 0; i < n_samples; i++)
+    gimp_curve_set_curve (curve,
+                          (gdouble) i / (gdouble) (n_samples - 1),
+                          (gdouble) samples[i]);
+
+  gimp_data_thaw (GIMP_DATA (curve));
+
+  return G_OBJECT (config);
+}
+
+GObject *
+gimp_curves_config_new_spline_cruft (gint32        channel,
+                                     const guint8 *points,
+                                     gint          n_points)
+{
+  GObject *config;
+  gdouble *d_points;
+  gint     i;
+
+  g_return_val_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
+                        channel <= GIMP_HISTOGRAM_ALPHA, NULL);
+  g_return_val_if_fail (points != NULL, NULL);
+  g_return_val_if_fail (n_points >= 2 && n_points <= 1024, NULL);
+
+  d_points = g_new (gdouble, 2 * n_points);
+
+  for (i = 0; i < n_points; i++)
+    {
+      d_points[i * 2]     = (gdouble) points[i * 2]     / 255.0;
+      d_points[i * 2 + 1] = (gdouble) points[i * 2 + 1] / 255.0;
+    }
+
+  config = gimp_curves_config_new_spline (channel, d_points, n_points);
+
+  g_free (d_points);
+
+  return config;
+}
+
+GObject *
+gimp_curves_config_new_explicit_cruft (gint32        channel,
+                                       const guint8 *samples,
+                                       gint          n_samples)
+{
+  GObject *config;
+  gdouble *d_samples;
+  gint     i;
+
+  g_return_val_if_fail (channel >= GIMP_HISTOGRAM_VALUE &&
+                        channel <= GIMP_HISTOGRAM_ALPHA, NULL);
+  g_return_val_if_fail (samples != NULL, NULL);
+  g_return_val_if_fail (n_samples >= 2 && n_samples <= 4096, NULL);
+
+  d_samples = g_new (gdouble, n_samples);
+
+  for (i = 0; i < n_samples; i++)
+    {
+      d_samples[i] = (gdouble) samples[i] / 255.0;
+    }
+
+  config = gimp_curves_config_new_explicit (channel, d_samples, n_samples);
+
+  g_free (d_samples);
+
+  return config;
+}
+
+void
+gimp_curves_config_reset_channel (GimpCurvesConfig *config)
+{
+  g_return_if_fail (GIMP_IS_CURVES_CONFIG (config));
+
+  gimp_config_reset (GIMP_CONFIG (config->curve[config->channel]));
+}
+
+#define GIMP_CURVE_N_CRUFT_POINTS 17
+
+gboolean
+gimp_curves_config_load_cruft (GimpCurvesConfig  *config,
+                               GInputStream      *input,
+                               GError           **error)
+{
+  GDataInputStream *data_input;
+  gint              index[5][GIMP_CURVE_N_CRUFT_POINTS];
+  gint              value[5][GIMP_CURVE_N_CRUFT_POINTS];
+  gchar            *line;
+  gsize             line_len;
+  gint              i, j;
+
+  g_return_val_if_fail (GIMP_IS_CURVES_CONFIG (config), FALSE);
+  g_return_val_if_fail (G_IS_INPUT_STREAM (input), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  data_input = g_data_input_stream_new (input);
+
+  line_len = 64;
+  line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+                                                  NULL, error);
+  if (! line)
+    return FALSE;
+
+  if (strcmp (line, "# GIMP Curves File") != 0)
+    {
+      g_set_error_literal (error, GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
+                           _("not a GIMP Curves file"));
+      g_object_unref (data_input);
+      g_free (line);
+      return FALSE;
+    }
+
+  for (i = 0; i < 5; i++)
+    {
+      for (j = 0; j < GIMP_CURVE_N_CRUFT_POINTS; j++)
+        {
+          gchar *x_str = NULL;
+          gchar *y_str = NULL;
+
+          if (! (x_str = g_data_input_stream_read_upto (data_input, " ", -1,
+                                                        NULL, NULL, error)) ||
+              ! g_data_input_stream_read_byte (data_input,  NULL, error) ||
+              ! (y_str = g_data_input_stream_read_upto (data_input, " ", -1,
+                                                        NULL, NULL, error)) ||
+              ! g_data_input_stream_read_byte (data_input,  NULL, error))
+            {
+              g_free (x_str);
+              g_free (y_str);
+              g_object_unref (data_input);
+              return FALSE;
+            }
+
+          if (sscanf (x_str, "%d", &index[i][j]) != 1 ||
+              sscanf (y_str, "%d", &value[i][j]) != 1)
+            {
+              g_set_error_literal (error,
+                                   GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
+                                   _("Parse error, didn't find 2 integers"));
+              g_free (x_str);
+              g_free (y_str);
+              g_object_unref (data_input);
+              return FALSE;
+            }
+
+          g_free (x_str);
+          g_free (y_str);
+        }
+    }
+
+  g_object_unref (data_input);
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  for (i = 0; i < 5; i++)
+    {
+      GimpCurve *curve = config->curve[i];
+
+      gimp_data_freeze (GIMP_DATA (curve));
+
+      gimp_curve_set_curve_type (curve, GIMP_CURVE_SMOOTH);
+      gimp_curve_clear_points (curve);
+
+      for (j = 0; j < GIMP_CURVE_N_CRUFT_POINTS; j++)
+        {
+          gdouble x;
+          gdouble y;
+
+          x = (gdouble) index[i][j] / 255.0;
+          y = (gdouble) value[i][j] / 255.0;
+
+          if (x >= 0.0)
+            gimp_curve_add_point (curve, x, y);
+        }
+
+      gimp_data_thaw (GIMP_DATA (curve));
+    }
+
+  config->linear = FALSE;
+
+  g_object_notify (G_OBJECT (config), "linear");
+
+  g_object_thaw_notify (G_OBJECT (config));
+
+  return TRUE;
+}
+
+gboolean
+gimp_curves_config_save_cruft (GimpCurvesConfig  *config,
+                               GOutputStream     *output,
+                               GError           **error)
+{
+  GString *string;
+  gint     i;
+
+  g_return_val_if_fail (GIMP_IS_CURVES_CONFIG (config), FALSE);
+  g_return_val_if_fail (G_IS_OUTPUT_STREAM (output), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  string = g_string_new ("# GIMP Curves File\n");
+
+  for (i = 0; i < 5; i++)
+    {
+      GimpCurve *curve = config->curve[i];
+      gint       j;
+
+      if (curve->curve_type == GIMP_CURVE_SMOOTH)
+        {
+          g_object_ref (curve);
+        }
+      else
+        {
+          curve = GIMP_CURVE (gimp_data_duplicate (GIMP_DATA (curve)));
+
+          gimp_curve_set_curve_type (curve, GIMP_CURVE_SMOOTH);
+        }
+
+      for (j = 0; j < GIMP_CURVE_N_CRUFT_POINTS; j++)
+        {
+          gint x = -1;
+          gint y = -1;
+
+          if (j < gimp_curve_get_n_points (curve))
+            {
+              gdouble point_x;
+              gdouble point_y;
+
+              gimp_curve_get_point (curve, j, &point_x, &point_y);
+
+              x = floor (point_x * 255.999);
+              y = floor (point_y * 255.999);
+            }
+
+          g_string_append_printf (string, "%d %d ", x, y);
+        }
+
+      g_string_append_printf (string, "\n");
+
+      g_object_unref (curve);
+    }
+
+  if (! g_output_stream_write_all (output, string->str, string->len,
+                                   NULL, NULL, error))
+    {
+      g_prefix_error (error, _("Writing curves file failed: "));
+      g_string_free (string, TRUE);
+      return FALSE;
+    }
+
+  g_string_free (string, TRUE);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpcurvesconfig.h b/app/operations/gimpcurvesconfig.h
new file mode 100644
index 0000000..c6241fe
--- /dev/null
+++ b/app/operations/gimpcurvesconfig.h
@@ -0,0 +1,81 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcurvesconfig.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_CURVES_CONFIG_H__
+#define __GIMP_CURVES_CONFIG_H__
+
+
+#include "gimpoperationsettings.h"
+
+
+#define GIMP_TYPE_CURVES_CONFIG            (gimp_curves_config_get_type ())
+#define GIMP_CURVES_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CURVES_CONFIG, GimpCurvesConfig))
+#define GIMP_CURVES_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_CURVES_CONFIG, GimpCurvesConfigClass))
+#define GIMP_IS_CURVES_CONFIG(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CURVES_CONFIG))
+#define GIMP_IS_CURVES_CONFIG_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_CURVES_CONFIG))
+#define GIMP_CURVES_CONFIG_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_CURVES_CONFIG, GimpCurvesConfigClass))
+
+
+typedef struct _GimpCurvesConfigClass GimpCurvesConfigClass;
+
+struct _GimpCurvesConfig
+{
+  GimpOperationSettings  parent_instance;
+
+  gboolean               linear;
+
+  GimpHistogramChannel   channel;
+
+  GimpCurve              *curve[5];
+};
+
+struct _GimpCurvesConfigClass
+{
+  GimpOperationSettingsClass  parent_class;
+};
+
+
+GType      gimp_curves_config_get_type            (void) G_GNUC_CONST;
+
+GObject  * gimp_curves_config_new_spline          (gint32             channel,
+                                                   const gdouble     *points,
+                                                   gint               n_points);
+GObject *  gimp_curves_config_new_explicit        (gint32             channel,
+                                                   const gdouble     *samples,
+                                                   gint               n_samples);
+
+GObject  * gimp_curves_config_new_spline_cruft    (gint32             channel,
+                                                   const guint8      *points,
+                                                   gint               n_points);
+GObject *  gimp_curves_config_new_explicit_cruft  (gint32             channel,
+                                                   const guint8      *samples,
+                                                   gint               n_samples);
+
+void       gimp_curves_config_reset_channel       (GimpCurvesConfig  *config);
+
+gboolean   gimp_curves_config_load_cruft          (GimpCurvesConfig  *config,
+                                                   GInputStream      *input,
+                                                   GError           **error);
+gboolean   gimp_curves_config_save_cruft          (GimpCurvesConfig  *config,
+                                                   GOutputStream     *output,
+                                                   GError           **error);
+
+
+#endif /* __GIMP_CURVES_CONFIG_H__ */
diff --git a/app/operations/gimphuesaturationconfig.c b/app/operations/gimphuesaturationconfig.c
new file mode 100644
index 0000000..4f0a397
--- /dev/null
+++ b/app/operations/gimphuesaturationconfig.c
@@ -0,0 +1,367 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimphuesaturationconfig.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimphuesaturationconfig.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_RANGE,
+  PROP_HUE,
+  PROP_SATURATION,
+  PROP_LIGHTNESS,
+  PROP_OVERLAP
+};
+
+
+static void     gimp_hue_saturation_config_iface_init   (GimpConfigInterface *iface);
+
+static void     gimp_hue_saturation_config_get_property (GObject          *object,
+                                                         guint             property_id,
+                                                         GValue           *value,
+                                                         GParamSpec       *pspec);
+static void     gimp_hue_saturation_config_set_property (GObject          *object,
+                                                         guint             property_id,
+                                                         const GValue     *value,
+                                                         GParamSpec       *pspec);
+
+static gboolean gimp_hue_saturation_config_serialize    (GimpConfig       *config,
+                                                         GimpConfigWriter *writer,
+                                                         gpointer          data);
+static gboolean gimp_hue_saturation_config_deserialize  (GimpConfig       *config,
+                                                         GScanner         *scanner,
+                                                         gint              nest_level,
+                                                         gpointer          data);
+static gboolean gimp_hue_saturation_config_equal        (GimpConfig       *a,
+                                                         GimpConfig       *b);
+static void     gimp_hue_saturation_config_reset        (GimpConfig       *config);
+static gboolean gimp_hue_saturation_config_copy         (GimpConfig       *src,
+                                                         GimpConfig       *dest,
+                                                         GParamFlags       flags);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpHueSaturationConfig, gimp_hue_saturation_config,
+                         GIMP_TYPE_OPERATION_SETTINGS,
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
+                                                gimp_hue_saturation_config_iface_init))
+
+#define parent_class gimp_hue_saturation_config_parent_class
+
+
+static void
+gimp_hue_saturation_config_class_init (GimpHueSaturationConfigClass *klass)
+{
+  GObjectClass      *object_class   = G_OBJECT_CLASS (klass);
+  GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
+
+  object_class->set_property        = gimp_hue_saturation_config_set_property;
+  object_class->get_property        = gimp_hue_saturation_config_get_property;
+
+  viewable_class->default_icon_name = "gimp-tool-hue-saturation";
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_RANGE,
+                         "range",
+                         _("Range"),
+                         _("The affected range"),
+                         GIMP_TYPE_HUE_RANGE,
+                         GIMP_HUE_RANGE_ALL, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HUE,
+                           "hue",
+                           _("Hue"),
+                           _("Hue"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_SATURATION,
+                           "saturation",
+                           _("Saturation"),
+                           _("Saturation"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LIGHTNESS,
+                           "lightness",
+                           _("Lightness"),
+                           _("Lightness"),
+                           -1.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_OVERLAP,
+                           "overlap",
+                           _("Overlap"),
+                           _("Overlap"),
+                           0.0, 1.0, 0.0, 0);
+}
+
+static void
+gimp_hue_saturation_config_iface_init (GimpConfigInterface *iface)
+{
+  iface->serialize   = gimp_hue_saturation_config_serialize;
+  iface->deserialize = gimp_hue_saturation_config_deserialize;
+  iface->equal       = gimp_hue_saturation_config_equal;
+  iface->reset       = gimp_hue_saturation_config_reset;
+  iface->copy        = gimp_hue_saturation_config_copy;
+}
+
+static void
+gimp_hue_saturation_config_init (GimpHueSaturationConfig *self)
+{
+  gimp_config_reset (GIMP_CONFIG (self));
+}
+
+static void
+gimp_hue_saturation_config_get_property (GObject    *object,
+                                         guint       property_id,
+                                         GValue     *value,
+                                         GParamSpec *pspec)
+{
+  GimpHueSaturationConfig *self = GIMP_HUE_SATURATION_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_RANGE:
+      g_value_set_enum (value, self->range);
+      break;
+
+    case PROP_HUE:
+      g_value_set_double (value, self->hue[self->range]);
+      break;
+
+    case PROP_SATURATION:
+      g_value_set_double (value, self->saturation[self->range]);
+      break;
+
+    case PROP_LIGHTNESS:
+      g_value_set_double (value, self->lightness[self->range]);
+      break;
+
+    case PROP_OVERLAP:
+      g_value_set_double (value, self->overlap);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_hue_saturation_config_set_property (GObject      *object,
+                                         guint         property_id,
+                                         const GValue *value,
+                                         GParamSpec   *pspec)
+{
+  GimpHueSaturationConfig *self = GIMP_HUE_SATURATION_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_RANGE:
+      self->range = g_value_get_enum (value);
+      g_object_notify (object, "hue");
+      g_object_notify (object, "saturation");
+      g_object_notify (object, "lightness");
+      break;
+
+    case PROP_HUE:
+      self->hue[self->range] = g_value_get_double (value);
+      break;
+
+    case PROP_SATURATION:
+      self->saturation[self->range] = g_value_get_double (value);
+      break;
+
+    case PROP_LIGHTNESS:
+      self->lightness[self->range] = g_value_get_double (value);
+      break;
+
+    case PROP_OVERLAP:
+      self->overlap = g_value_get_double (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_hue_saturation_config_serialize (GimpConfig       *config,
+                                      GimpConfigWriter *writer,
+                                      gpointer          data)
+{
+  GimpHueSaturationConfig *hs_config = GIMP_HUE_SATURATION_CONFIG (config);
+  GimpHueRange             range;
+  GimpHueRange             old_range;
+  gboolean                 success = TRUE;
+
+  if (! gimp_operation_settings_config_serialize_base (config, writer, data))
+    return FALSE;
+
+  old_range = hs_config->range;
+
+  for (range = GIMP_HUE_RANGE_ALL; range <= GIMP_HUE_RANGE_MAGENTA; range++)
+    {
+      hs_config->range = range;
+
+      success = (gimp_config_serialize_property_by_name (config, "range",
+                                                         writer) &&
+                 gimp_config_serialize_property_by_name (config, "hue",
+                                                         writer) &&
+                 gimp_config_serialize_property_by_name (config, "saturation",
+                                                         writer) &&
+                 gimp_config_serialize_property_by_name (config, "lightness",
+                                                         writer));
+
+      if (! success)
+        break;
+    }
+
+  if (success)
+    success = gimp_config_serialize_property_by_name (config, "overlap",
+                                                      writer);
+
+  hs_config->range = old_range;
+
+  return success;
+}
+
+static gboolean
+gimp_hue_saturation_config_deserialize (GimpConfig *config,
+                                        GScanner   *scanner,
+                                        gint        nest_level,
+                                        gpointer    data)
+{
+  GimpHueSaturationConfig *hs_config = GIMP_HUE_SATURATION_CONFIG (config);
+  GimpHueRange             old_range;
+  gboolean                 success = TRUE;
+
+  old_range = hs_config->range;
+
+  success = gimp_config_deserialize_properties (config, scanner, nest_level);
+
+  g_object_set (config, "range", old_range, NULL);
+
+  return success;
+}
+
+static gboolean
+gimp_hue_saturation_config_equal (GimpConfig *a,
+                                  GimpConfig *b)
+{
+  GimpHueSaturationConfig *config_a = GIMP_HUE_SATURATION_CONFIG (a);
+  GimpHueSaturationConfig *config_b = GIMP_HUE_SATURATION_CONFIG (b);
+  GimpHueRange             range;
+
+  if (! gimp_operation_settings_config_equal_base (a, b))
+    return FALSE;
+
+  for (range = GIMP_HUE_RANGE_ALL; range <= GIMP_HUE_RANGE_MAGENTA; range++)
+    {
+      if (config_a->hue[range]        != config_b->hue[range]        ||
+          config_a->saturation[range] != config_b->saturation[range] ||
+          config_a->lightness[range]  != config_b->lightness[range])
+        return FALSE;
+    }
+
+  /* don't compare "range" */
+
+  if (config_a->overlap != config_b->overlap)
+    return FALSE;
+
+  return TRUE;
+}
+
+static void
+gimp_hue_saturation_config_reset (GimpConfig *config)
+{
+  GimpHueSaturationConfig *hs_config = GIMP_HUE_SATURATION_CONFIG (config);
+  GimpHueRange             range;
+
+  gimp_operation_settings_config_reset_base (config);
+
+  for (range = GIMP_HUE_RANGE_ALL; range <= GIMP_HUE_RANGE_MAGENTA; range++)
+    {
+      hs_config->range = range;
+      gimp_hue_saturation_config_reset_range (hs_config);
+    }
+
+  gimp_config_reset_property (G_OBJECT (config), "range");
+  gimp_config_reset_property (G_OBJECT (config), "overlap");
+}
+
+static gboolean
+gimp_hue_saturation_config_copy (GimpConfig   *src,
+                                 GimpConfig   *dest,
+                                 GParamFlags   flags)
+{
+  GimpHueSaturationConfig *src_config  = GIMP_HUE_SATURATION_CONFIG (src);
+  GimpHueSaturationConfig *dest_config = GIMP_HUE_SATURATION_CONFIG (dest);
+  GimpHueRange             range;
+
+  if (! gimp_operation_settings_config_copy_base (src, dest, flags))
+    return FALSE;
+
+  for (range = GIMP_HUE_RANGE_ALL; range <= GIMP_HUE_RANGE_MAGENTA; range++)
+    {
+      dest_config->hue[range]        = src_config->hue[range];
+      dest_config->saturation[range] = src_config->saturation[range];
+      dest_config->lightness[range]  = src_config->lightness[range];
+    }
+
+  g_object_notify (G_OBJECT (dest), "hue");
+  g_object_notify (G_OBJECT (dest), "saturation");
+  g_object_notify (G_OBJECT (dest), "lightness");
+
+  dest_config->range   = src_config->range;
+  dest_config->overlap = src_config->overlap;
+
+  g_object_notify (G_OBJECT (dest), "range");
+  g_object_notify (G_OBJECT (dest), "overlap");
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+void
+gimp_hue_saturation_config_reset_range (GimpHueSaturationConfig *config)
+{
+  g_return_if_fail (GIMP_IS_HUE_SATURATION_CONFIG (config));
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  gimp_config_reset_property (G_OBJECT (config), "hue");
+  gimp_config_reset_property (G_OBJECT (config), "saturation");
+  gimp_config_reset_property (G_OBJECT (config), "lightness");
+
+  g_object_thaw_notify (G_OBJECT (config));
+}
diff --git a/app/operations/gimphuesaturationconfig.h b/app/operations/gimphuesaturationconfig.h
new file mode 100644
index 0000000..151ac05
--- /dev/null
+++ b/app/operations/gimphuesaturationconfig.h
@@ -0,0 +1,62 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimphuesaturationconfig.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_HUE_SATURATION_CONFIG_H__
+#define __GIMP_HUE_SATURATION_CONFIG_H__
+
+
+#include "gimpoperationsettings.h"
+
+
+#define GIMP_TYPE_HUE_SATURATION_CONFIG            (gimp_hue_saturation_config_get_type ())
+#define GIMP_HUE_SATURATION_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_HUE_SATURATION_CONFIG, GimpHueSaturationConfig))
+#define GIMP_HUE_SATURATION_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_HUE_SATURATION_CONFIG, GimpHueSaturationConfigClass))
+#define GIMP_IS_HUE_SATURATION_CONFIG(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_HUE_SATURATION_CONFIG))
+#define GIMP_IS_HUE_SATURATION_CONFIG_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_HUE_SATURATION_CONFIG))
+#define GIMP_HUE_SATURATION_CONFIG_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_HUE_SATURATION_CONFIG, GimpHueSaturationConfigClass))
+
+
+typedef struct _GimpHueSaturationConfigClass GimpHueSaturationConfigClass;
+
+struct _GimpHueSaturationConfig
+{
+  GimpOperationSettings  parent_instance;
+
+  GimpHueRange           range;
+
+  gdouble                hue[7];
+  gdouble                saturation[7];
+  gdouble                lightness[7];
+
+  gdouble                overlap;
+};
+
+struct _GimpHueSaturationConfigClass
+{
+  GimpOperationSettingsClass  parent_class;
+};
+
+
+GType   gimp_hue_saturation_config_get_type    (void) G_GNUC_CONST;
+
+void    gimp_hue_saturation_config_reset_range (GimpHueSaturationConfig *config);
+
+
+#endif /* __GIMP_HUE_SATURATION_CONFIG_H__ */
diff --git a/app/operations/gimplevelsconfig.c b/app/operations/gimplevelsconfig.c
new file mode 100644
index 0000000..df5d349
--- /dev/null
+++ b/app/operations/gimplevelsconfig.c
@@ -0,0 +1,964 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimplevelsconfig.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <errno.h>
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "core/gimp-utils.h"
+#include "core/gimpcurve.h"
+#include "core/gimphistogram.h"
+
+#include "gimpcurvesconfig.h"
+#include "gimplevelsconfig.h"
+#include "gimpoperationlevels.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_LINEAR,
+  PROP_CHANNEL,
+  PROP_LOW_INPUT,
+  PROP_HIGH_INPUT,
+  PROP_CLAMP_INPUT,
+  PROP_GAMMA,
+  PROP_LOW_OUTPUT,
+  PROP_HIGH_OUTPUT,
+  PROP_CLAMP_OUTPUT
+};
+
+
+static void     gimp_levels_config_iface_init   (GimpConfigInterface *iface);
+
+static void     gimp_levels_config_get_property (GObject          *object,
+                                                 guint             property_id,
+                                                 GValue           *value,
+                                                 GParamSpec       *pspec);
+static void     gimp_levels_config_set_property (GObject          *object,
+                                                 guint             property_id,
+                                                 const GValue     *value,
+                                                 GParamSpec       *pspec);
+
+static gboolean gimp_levels_config_serialize    (GimpConfig       *config,
+                                                 GimpConfigWriter *writer,
+                                                 gpointer          data);
+static gboolean gimp_levels_config_deserialize  (GimpConfig       *config,
+                                                 GScanner         *scanner,
+                                                 gint              nest_level,
+                                                 gpointer          data);
+static gboolean gimp_levels_config_equal        (GimpConfig       *a,
+                                                 GimpConfig       *b);
+static void     gimp_levels_config_reset        (GimpConfig       *config);
+static gboolean gimp_levels_config_copy         (GimpConfig       *src,
+                                                 GimpConfig       *dest,
+                                                 GParamFlags       flags);
+
+
+G_DEFINE_TYPE_WITH_CODE (GimpLevelsConfig, gimp_levels_config,
+                         GIMP_TYPE_OPERATION_SETTINGS,
+                         G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
+                                                gimp_levels_config_iface_init))
+
+#define parent_class gimp_levels_config_parent_class
+
+
+static void
+gimp_levels_config_class_init (GimpLevelsConfigClass *klass)
+{
+  GObjectClass      *object_class   = G_OBJECT_CLASS (klass);
+  GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
+
+  object_class->set_property        = gimp_levels_config_set_property;
+  object_class->get_property        = gimp_levels_config_get_property;
+
+  viewable_class->default_icon_name = "gimp-tool-levels";
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_LINEAR,
+                            "linear",
+                            _("Linear"),
+                            _("Work on linear RGB"),
+                            FALSE, 0);
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
+                         "channel",
+                         _("Channel"),
+                         _("The affected channel"),
+                         GIMP_TYPE_HISTOGRAM_CHANNEL,
+                         GIMP_HISTOGRAM_VALUE, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW_INPUT,
+                           "low-input",
+                           _("Low Input"),
+                           _("Low Input"),
+                           0.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH_INPUT,
+                           "high-input",
+                           _("High Input"),
+                           _("High Input"),
+                           0.0, 1.0, 1.0, 0);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_CLAMP_INPUT,
+                           "clamp-input",
+                           _("Clamp Input"),
+                           _("Clamp input values before applying output mapping."),
+                            FALSE, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_GAMMA,
+                           "gamma",
+                           _("Gamma"),
+                           _("Gamma"),
+                           0.1, 10.0, 1.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW_OUTPUT,
+                           "low-output",
+                           _("Low Output"),
+                           _("Low Output"),
+                           0.0, 1.0, 0.0, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH_OUTPUT,
+                           "high-output",
+                           _("High Output"),
+                           _("High Output"),
+                           0.0, 1.0, 1.0, 0);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_CLAMP_OUTPUT,
+                           "clamp-output",
+                           _("Clamp Output"),
+                           _("Clamp final output values."),
+                            FALSE, 0);
+}
+
+static void
+gimp_levels_config_iface_init (GimpConfigInterface *iface)
+{
+  iface->serialize   = gimp_levels_config_serialize;
+  iface->deserialize = gimp_levels_config_deserialize;
+  iface->equal       = gimp_levels_config_equal;
+  iface->reset       = gimp_levels_config_reset;
+  iface->copy        = gimp_levels_config_copy;
+}
+
+static void
+gimp_levels_config_init (GimpLevelsConfig *self)
+{
+  gimp_config_reset (GIMP_CONFIG (self));
+}
+
+static void
+gimp_levels_config_get_property (GObject    *object,
+                                 guint       property_id,
+                                 GValue     *value,
+                                 GParamSpec *pspec)
+{
+  GimpLevelsConfig *self = GIMP_LEVELS_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_LINEAR:
+      g_value_set_boolean (value, self->linear);
+      break;
+
+    case PROP_CHANNEL:
+      g_value_set_enum (value, self->channel);
+      break;
+
+    case PROP_LOW_INPUT:
+      g_value_set_double (value, self->low_input[self->channel]);
+      break;
+
+    case PROP_HIGH_INPUT:
+      g_value_set_double (value, self->high_input[self->channel]);
+      break;
+
+    case PROP_CLAMP_INPUT:
+      g_value_set_boolean (value, self->clamp_input);
+      break;
+
+    case PROP_GAMMA:
+      g_value_set_double (value, self->gamma[self->channel]);
+      break;
+
+    case PROP_LOW_OUTPUT:
+      g_value_set_double (value, self->low_output[self->channel]);
+      break;
+
+    case PROP_HIGH_OUTPUT:
+      g_value_set_double (value, self->high_output[self->channel]);
+      break;
+
+    case PROP_CLAMP_OUTPUT:
+      g_value_set_boolean (value, self->clamp_output);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_levels_config_set_property (GObject      *object,
+                                 guint         property_id,
+                                 const GValue *value,
+                                 GParamSpec   *pspec)
+{
+  GimpLevelsConfig *self = GIMP_LEVELS_CONFIG (object);
+
+  switch (property_id)
+    {
+    case PROP_LINEAR:
+      self->linear = g_value_get_boolean (value);
+      break;
+
+    case PROP_CHANNEL:
+      self->channel = g_value_get_enum (value);
+      g_object_notify (object, "low-input");
+      g_object_notify (object, "high-input");
+      g_object_notify (object, "gamma");
+      g_object_notify (object, "low-output");
+      g_object_notify (object, "high-output");
+      break;
+
+    case PROP_LOW_INPUT:
+      self->low_input[self->channel] = g_value_get_double (value);
+      break;
+
+    case PROP_HIGH_INPUT:
+      self->high_input[self->channel] = g_value_get_double (value);
+      break;
+
+    case PROP_CLAMP_INPUT:
+      self->clamp_input = g_value_get_boolean (value);
+      break;
+
+    case PROP_GAMMA:
+      self->gamma[self->channel] = g_value_get_double (value);
+      break;
+
+    case PROP_LOW_OUTPUT:
+      self->low_output[self->channel] = g_value_get_double (value);
+      break;
+
+    case PROP_HIGH_OUTPUT:
+      self->high_output[self->channel] = g_value_get_double (value);
+      break;
+
+    case PROP_CLAMP_OUTPUT:
+      self->clamp_output = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_levels_config_serialize (GimpConfig       *config,
+                              GimpConfigWriter *writer,
+                              gpointer          data)
+{
+  GimpLevelsConfig     *l_config = GIMP_LEVELS_CONFIG (config);
+  GimpHistogramChannel  channel;
+  GimpHistogramChannel  old_channel;
+  gboolean              success = TRUE;
+
+  if (! gimp_operation_settings_config_serialize_base (config, writer, data)    ||
+      ! gimp_config_serialize_property_by_name (config, "linear",       writer) ||
+      ! gimp_config_serialize_property_by_name (config, "clamp-input",  writer) ||
+      ! gimp_config_serialize_property_by_name (config, "clamp-output", writer))
+    return FALSE;
+
+  old_channel = l_config->channel;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      l_config->channel = channel;
+
+      /*  serialize the channel properties manually (not using
+       *  gimp_config_serialize_properties()), so the parent class'
+       *  properties don't end up in the config file one per channel.
+       *  See bug #700653.
+       */
+      success =
+        (gimp_config_serialize_property_by_name (config, "channel",     writer) &&
+         gimp_config_serialize_property_by_name (config, "low-input",   writer) &&
+         gimp_config_serialize_property_by_name (config, "high-input",  writer) &&
+         gimp_config_serialize_property_by_name (config, "gamma",       writer) &&
+         gimp_config_serialize_property_by_name (config, "low-output",  writer) &&
+         gimp_config_serialize_property_by_name (config, "high-output", writer));
+
+      if (! success)
+        break;
+    }
+
+  l_config->channel = old_channel;
+
+  return success;
+}
+
+static gboolean
+gimp_levels_config_deserialize (GimpConfig *config,
+                                GScanner   *scanner,
+                                gint        nest_level,
+                                gpointer    data)
+{
+  GimpLevelsConfig     *l_config = GIMP_LEVELS_CONFIG (config);
+  GimpHistogramChannel  old_channel;
+  gboolean              success = TRUE;
+
+  old_channel = l_config->channel;
+
+  success = gimp_config_deserialize_properties (config, scanner, nest_level);
+
+  g_object_set (config, "channel", old_channel, NULL);
+
+  return success;
+}
+
+static gboolean
+gimp_levels_config_equal (GimpConfig *a,
+                          GimpConfig *b)
+{
+  GimpLevelsConfig     *config_a = GIMP_LEVELS_CONFIG (a);
+  GimpLevelsConfig     *config_b = GIMP_LEVELS_CONFIG (b);
+  GimpHistogramChannel  channel;
+
+  if (! gimp_operation_settings_config_equal_base (a, b) ||
+      config_a->linear       != config_b->linear         ||
+      config_a->clamp_input  != config_b->clamp_input    ||
+      config_a->clamp_output != config_b->clamp_output)
+    return FALSE;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      if (config_a->gamma[channel]       != config_b->gamma[channel]      ||
+          config_a->low_input[channel]   != config_b->low_input[channel]  ||
+          config_a->high_input[channel]  != config_b->high_input[channel] ||
+          config_a->low_output[channel]  != config_b->low_output[channel] ||
+          config_a->high_output[channel] != config_b->high_output[channel])
+        return FALSE;
+    }
+
+  /* don't compare "channel" */
+
+  return TRUE;
+}
+
+static void
+gimp_levels_config_reset (GimpConfig *config)
+{
+  GimpLevelsConfig     *l_config = GIMP_LEVELS_CONFIG (config);
+  GimpHistogramChannel  channel;
+
+  gimp_operation_settings_config_reset_base (config);
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      l_config->channel = channel;
+      gimp_levels_config_reset_channel (l_config);
+    }
+
+  gimp_config_reset_property (G_OBJECT (config), "linear");
+  gimp_config_reset_property (G_OBJECT (config), "channel");
+  gimp_config_reset_property (G_OBJECT (config), "clamp-input");
+  gimp_config_reset_property (G_OBJECT (config), "clamp_output");
+}
+
+static gboolean
+gimp_levels_config_copy (GimpConfig  *src,
+                         GimpConfig  *dest,
+                         GParamFlags  flags)
+{
+  GimpLevelsConfig     *src_config  = GIMP_LEVELS_CONFIG (src);
+  GimpLevelsConfig     *dest_config = GIMP_LEVELS_CONFIG (dest);
+  GimpHistogramChannel  channel;
+
+  if (! gimp_operation_settings_config_copy_base (src, dest, flags))
+    return FALSE;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      dest_config->gamma[channel]       = src_config->gamma[channel];
+      dest_config->low_input[channel]   = src_config->low_input[channel];
+      dest_config->high_input[channel]  = src_config->high_input[channel];
+      dest_config->low_output[channel]  = src_config->low_output[channel];
+      dest_config->high_output[channel] = src_config->high_output[channel];
+    }
+
+  g_object_notify (G_OBJECT (dest), "gamma");
+  g_object_notify (G_OBJECT (dest), "low-input");
+  g_object_notify (G_OBJECT (dest), "high-input");
+  g_object_notify (G_OBJECT (dest), "low-output");
+  g_object_notify (G_OBJECT (dest), "high-output");
+
+  dest_config->linear       = src_config->linear;
+  dest_config->channel      = src_config->channel;
+  dest_config->clamp_input  = src_config->clamp_input;
+  dest_config->clamp_output = src_config->clamp_output;
+
+  g_object_notify (G_OBJECT (dest), "linear");
+  g_object_notify (G_OBJECT (dest), "channel");
+  g_object_notify (G_OBJECT (dest), "clamp-input");
+  g_object_notify (G_OBJECT (dest), "clamp-output");
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+void
+gimp_levels_config_reset_channel (GimpLevelsConfig *config)
+{
+  g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  gimp_config_reset_property (G_OBJECT (config), "gamma");
+  gimp_config_reset_property (G_OBJECT (config), "low-input");
+  gimp_config_reset_property (G_OBJECT (config), "high-input");
+  gimp_config_reset_property (G_OBJECT (config), "low-output");
+  gimp_config_reset_property (G_OBJECT (config), "high-output");
+
+  g_object_thaw_notify (G_OBJECT (config));
+}
+
+void
+gimp_levels_config_stretch (GimpLevelsConfig *config,
+                            GimpHistogram    *histogram,
+                            gboolean          is_color)
+{
+  g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
+  g_return_if_fail (histogram != NULL);
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  if (is_color)
+    {
+      GimpHistogramChannel channel;
+
+      /*  Set the overall value to defaults  */
+      channel = config->channel;
+      config->channel = GIMP_HISTOGRAM_VALUE;
+      gimp_levels_config_reset_channel (config);
+      config->channel = channel;
+
+      for (channel = GIMP_HISTOGRAM_RED;
+           channel <= GIMP_HISTOGRAM_BLUE;
+           channel++)
+        {
+          gimp_levels_config_stretch_channel (config, histogram, channel);
+        }
+    }
+  else
+    {
+      gimp_levels_config_stretch_channel (config, histogram,
+                                          GIMP_HISTOGRAM_VALUE);
+    }
+
+  g_object_thaw_notify (G_OBJECT (config));
+}
+
+void
+gimp_levels_config_stretch_channel (GimpLevelsConfig     *config,
+                                    GimpHistogram        *histogram,
+                                    GimpHistogramChannel  channel)
+{
+  gdouble count;
+  gdouble bias = 0.006;
+  gint    n_bins;
+  gint    i;
+
+  g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
+  g_return_if_fail (histogram != NULL);
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  config->gamma[channel]       = 1.0;
+  config->low_output[channel]  = 0.0;
+  config->high_output[channel] = 1.0;
+
+  n_bins = gimp_histogram_n_bins (histogram);
+  count  = gimp_histogram_get_count (histogram, channel, 0, n_bins - 1);
+
+  if (count == 0.0)
+    {
+      config->low_input[channel]  = 0.0;
+      config->high_input[channel] = 0.0;
+    }
+  else
+    {
+      gdouble new_count;
+      gdouble percentage;
+      gdouble next_percentage;
+
+      /*  Set the low input  */
+      new_count = 0.0;
+
+      for (i = 0; i < (n_bins - 1); i++)
+        {
+          new_count += gimp_histogram_get_value (histogram, channel, i);
+          percentage = new_count / count;
+          next_percentage = (new_count +
+                             gimp_histogram_get_value (histogram,
+                                                       channel,
+                                                       i + 1)) / count;
+
+          if (fabs (percentage - bias) < fabs (next_percentage - bias))
+            {
+              config->low_input[channel] = (gdouble) (i + 1) / (n_bins - 1);
+              break;
+            }
+        }
+
+      /*  Set the high input  */
+      new_count = 0.0;
+
+      for (i = (n_bins - 1); i > 0; i--)
+        {
+          new_count += gimp_histogram_get_value (histogram, channel, i);
+          percentage = new_count / count;
+          next_percentage = (new_count +
+                             gimp_histogram_get_value (histogram,
+                                                       channel,
+                                                       i - 1)) / count;
+
+          if (fabs (percentage - bias) < fabs (next_percentage - bias))
+            {
+              config->high_input[channel] = (gdouble) (i - 1) / (n_bins - 1);
+              break;
+            }
+        }
+    }
+
+  g_object_notify (G_OBJECT (config), "gamma");
+  g_object_notify (G_OBJECT (config), "low-input");
+  g_object_notify (G_OBJECT (config), "high-input");
+  g_object_notify (G_OBJECT (config), "low-output");
+  g_object_notify (G_OBJECT (config), "high-output");
+
+  g_object_thaw_notify (G_OBJECT (config));
+}
+
+static gdouble
+gimp_levels_config_input_from_color (GimpHistogramChannel  channel,
+                                     const GimpRGB        *color)
+{
+  switch (channel)
+    {
+    case GIMP_HISTOGRAM_VALUE:
+      return MAX (MAX (color->r, color->g), color->b);
+
+    case GIMP_HISTOGRAM_RED:
+      return color->r;
+
+    case GIMP_HISTOGRAM_GREEN:
+      return color->g;
+
+    case GIMP_HISTOGRAM_BLUE:
+      return color->b;
+
+    case GIMP_HISTOGRAM_ALPHA:
+      return color->a;
+
+    case GIMP_HISTOGRAM_RGB:
+      return MIN (MIN (color->r, color->g), color->b);
+
+    case GIMP_HISTOGRAM_LUMINANCE:
+      return GIMP_RGB_LUMINANCE (color->r, color->g, color->b);
+    }
+
+  return 0.0;
+}
+
+void
+gimp_levels_config_adjust_by_colors (GimpLevelsConfig     *config,
+                                     GimpHistogramChannel  channel,
+                                     const GimpRGB        *black,
+                                     const GimpRGB        *gray,
+                                     const GimpRGB        *white)
+{
+  g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  if (black)
+    {
+      config->low_input[channel] = gimp_levels_config_input_from_color (channel,
+                                                                        black);
+      g_object_notify (G_OBJECT (config), "low-input");
+    }
+
+
+  if (white)
+    {
+      config->high_input[channel] = gimp_levels_config_input_from_color (channel,
+                                                                         white);
+      g_object_notify (G_OBJECT (config), "high-input");
+    }
+
+  if (gray)
+    {
+      gdouble input;
+      gdouble range;
+      gdouble inten;
+      gdouble out_light;
+      gdouble lightness;
+
+      /* Calculate lightness value */
+      lightness = GIMP_RGB_LUMINANCE (gray->r, gray->g, gray->b);
+
+      input = gimp_levels_config_input_from_color (channel, gray);
+
+      range = config->high_input[channel] - config->low_input[channel];
+      if (range <= 0)
+        goto out;
+
+      input -= config->low_input[channel];
+      if (input < 0)
+        goto out;
+
+      /* Normalize input and lightness */
+      inten = input / range;
+      out_light = lightness / range;
+
+      /* See bug 622054: picking pure black or white as gamma doesn't
+       * work. But we cannot compare to 0.0 or 1.0 because cpus and
+       * compilers are shit. If you try to check out_light using
+       * printf() it will give exact 0.0 or 1.0 anyway, probably
+       * because the generated code is different and out_light doesn't
+       * live in a register. That must be why the cpu/compiler mafia
+       * invented epsilon and defined this shit to be the programmer's
+       * responsibility.
+       */
+      if (out_light <= 0.0001 || out_light >= 0.9999)
+        goto out;
+
+      /* Map selected color to corresponding lightness */
+      config->gamma[channel] = log (inten) / log (out_light);
+      config->gamma[channel] = CLAMP (config->gamma[channel], 0.1, 10.0);
+      g_object_notify (G_OBJECT (config), "gamma");
+    }
+
+ out:
+  g_object_thaw_notify (G_OBJECT (config));
+}
+
+GimpCurvesConfig *
+gimp_levels_config_to_curves_config (GimpLevelsConfig *config)
+{
+  GimpCurvesConfig     *curves;
+  GimpHistogramChannel  channel;
+
+  g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), NULL);
+
+  curves = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);
+
+  gimp_operation_settings_config_copy_base (GIMP_CONFIG (config),
+                                            GIMP_CONFIG (curves),
+                                            0);
+
+  curves->linear = config->linear;
+
+  for (channel = GIMP_HISTOGRAM_VALUE;
+       channel <= GIMP_HISTOGRAM_ALPHA;
+       channel++)
+    {
+      GimpCurve  *curve    = curves->curve[channel];
+      static const gint n  = 8;
+      gdouble     gamma    = config->gamma[channel];
+      gdouble     delta_in;
+      gdouble     delta_out;
+      gdouble     x, y;
+
+      /* clear the points set by default */
+      gimp_curve_clear_points (curve);
+
+      delta_in  = config->high_input[channel] - config->low_input[channel];
+      delta_out = config->high_output[channel] - config->low_output[channel];
+
+      x = config->low_input[channel];
+      y = config->low_output[channel];
+
+      gimp_curve_add_point (curve, x, y);
+
+      if (delta_out != 0 && gamma != 1.0)
+        {
+          /* The Levels tool performs gamma adjustment, which is a
+           * power law, while the Curves tool uses cubic Bézier
+           * curves. Here we try to approximate this gamma adjustment
+           * with a Bézier curve with 5 control points. Two of them
+           * must be (low_input, low_output) and (high_input,
+           * high_output), so we need to add 3 more control points in
+           * the middle.
+           */
+          gint i;
+
+          if (gamma > 1)
+            {
+              /* Case no. 1: γ > 1
+               *
+               * The curve should look like a horizontal
+               * parabola. Since its curvature is greatest when x is
+               * small, we add more control points there, so the
+               * approximation is more accurate. I decided to set the
+               * length of the consecutive segments to x₀, γ⋅x₀, γ²⋅x₀
+               * and γ³⋅x₀ and I saw that the curves looked
+               * good. Still, this is completely arbitrary.
+               */
+              gdouble dx = 0;
+              gdouble x0;
+
+              for (i = 0; i < n; ++i)
+                dx = dx * gamma + 1;
+              x0 = delta_in / dx;
+
+              dx = 0;
+              for (i = 1; i < n; ++i)
+                {
+                  dx = dx * gamma + x0;
+                  x = config->low_input[channel] + dx;
+                  y = config->low_output[channel] + delta_out *
+                      gimp_operation_levels_map_input (config, channel, x);
+                  gimp_curve_add_point (curve, x, y);
+                }
+            }
+          else
+            {
+              /* Case no. 2: γ < 1
+               *
+               * The curve is the same as the one in case no. 1,
+               * observed through a reflexion along the y = x axis. So
+               * if we invert γ and swap the x and y axes we can use
+               * the same method as in case no. 1.
+               */
+              GimpLevelsConfig *config_inv;
+              gdouble           dy = 0;
+              gdouble           y0;
+              const gdouble     gamma_inv = 1 / gamma;
+
+              config_inv = gimp_config_duplicate (GIMP_CONFIG (config));
+
+              config_inv->gamma[channel]       = gamma_inv;
+              config_inv->low_input[channel]   = config->low_output[channel];
+              config_inv->low_output[channel]  = config->low_input[channel];
+              config_inv->high_input[channel]  = config->high_output[channel];
+              config_inv->high_output[channel] = config->high_input[channel];
+
+              for (i = 0; i < n; ++i)
+                dy = dy * gamma_inv + 1;
+              y0 = delta_out / dy;
+
+              dy = 0;
+              for (i = 1; i < n; ++i)
+                {
+                  dy = dy * gamma_inv + y0;
+                  y = config->low_output[channel] + dy;
+                  x = config->low_input[channel] + delta_in *
+                      gimp_operation_levels_map_input (config_inv, channel, y);
+                  gimp_curve_add_point (curve, x, y);
+                }
+
+              g_object_unref (config_inv);
+            }
+        }
+
+      x = config->high_input[channel];
+      y = config->high_output[channel];
+
+      gimp_curve_add_point (curve, x, y);
+    }
+
+  return curves;
+}
+
+gboolean
+gimp_levels_config_load_cruft (GimpLevelsConfig  *config,
+                               GInputStream      *input,
+                               GError           **error)
+{
+  GDataInputStream *data_input;
+  gint              low_input[5];
+  gint              high_input[5];
+  gint              low_output[5];
+  gint              high_output[5];
+  gdouble           gamma[5];
+  gchar            *line;
+  gsize             line_len;
+  gint              i;
+
+  g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), FALSE);
+  g_return_val_if_fail (G_IS_INPUT_STREAM (input), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  data_input = g_data_input_stream_new (input);
+
+  line_len = 64;
+  line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+                                                  NULL, error);
+  if (! line)
+    return FALSE;
+
+  if (strcmp (line, "# GIMP Levels File") != 0)
+    {
+      g_set_error_literal (error, GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
+                           _("not a GIMP Levels file"));
+      g_object_unref (data_input);
+      g_free (line);
+      return FALSE;
+    }
+
+  g_free (line);
+
+  for (i = 0; i < 5; i++)
+    {
+      gchar  float_buf[32];
+      gchar *endp;
+      gint   fields;
+
+      line_len = 64;
+      line = gimp_data_input_stream_read_line_always (data_input, &line_len,
+                                                      NULL, error);
+      if (! line)
+        {
+          g_object_unref (data_input);
+          return FALSE;
+        }
+
+      fields = sscanf (line, "%d %d %d %d %31s",
+                       &low_input[i],
+                       &high_input[i],
+                       &low_output[i],
+                       &high_output[i],
+                       float_buf);
+
+      g_free (line);
+
+      if (fields != 5)
+        goto error;
+
+      gamma[i] = g_ascii_strtod (float_buf, &endp);
+
+      if (endp == float_buf || errno == ERANGE)
+        goto error;
+    }
+
+  g_object_unref (data_input);
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  for (i = 0; i < 5; i++)
+    {
+      config->low_input[i]   = low_input[i]   / 255.0;
+      config->high_input[i]  = high_input[i]  / 255.0;
+      config->gamma[i]       = gamma[i];
+      config->low_output[i]  = low_output[i]  / 255.0;
+      config->high_output[i] = high_output[i] / 255.0;
+    }
+
+  config->linear       = FALSE;
+  config->clamp_input  = TRUE;
+  config->clamp_output = TRUE;
+
+  g_object_notify (G_OBJECT (config), "linear");
+  g_object_notify (G_OBJECT (config), "low-input");
+  g_object_notify (G_OBJECT (config), "high-input");
+  g_object_notify (G_OBJECT (config), "clamp-input");
+  g_object_notify (G_OBJECT (config), "gamma");
+  g_object_notify (G_OBJECT (config), "low-output");
+  g_object_notify (G_OBJECT (config), "high-output");
+  g_object_notify (G_OBJECT (config), "clamp-output");
+
+  g_object_thaw_notify (G_OBJECT (config));
+
+  return TRUE;
+
+ error:
+  g_object_unref (data_input);
+
+  g_set_error_literal (error, GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
+                       _("parse error"));
+  return FALSE;
+}
+
+gboolean
+gimp_levels_config_save_cruft (GimpLevelsConfig  *config,
+                               GOutputStream     *output,
+                               GError           **error)
+{
+  GString *string;
+  gint     i;
+
+  g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), FALSE);
+  g_return_val_if_fail (G_IS_OUTPUT_STREAM (output), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  string = g_string_new ("# GIMP Levels File\n");
+
+  for (i = 0; i < 5; i++)
+    {
+      gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
+
+      g_string_append_printf (string,
+                              "%d %d %d %d %s\n",
+                              (gint) (config->low_input[i]   * 255.999),
+                              (gint) (config->high_input[i]  * 255.999),
+                              (gint) (config->low_output[i]  * 255.999),
+                              (gint) (config->high_output[i] * 255.999),
+                              g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE,
+                                              config->gamma[i]));
+    }
+
+  if (! g_output_stream_write_all (output, string->str, string->len,
+                                   NULL, NULL, error))
+    {
+      g_prefix_error (error, _("Writing levels file failed: "));
+      g_string_free (string, TRUE);
+      return FALSE;
+    }
+
+  g_string_free (string, TRUE);
+
+  return TRUE;
+}
diff --git a/app/operations/gimplevelsconfig.h b/app/operations/gimplevelsconfig.h
new file mode 100644
index 0000000..2e7569c
--- /dev/null
+++ b/app/operations/gimplevelsconfig.h
@@ -0,0 +1,92 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimplevelsconfig.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_LEVELS_CONFIG_H__
+#define __GIMP_LEVELS_CONFIG_H__
+
+
+#include "gimpoperationsettings.h"
+
+
+#define GIMP_TYPE_LEVELS_CONFIG            (gimp_levels_config_get_type ())
+#define GIMP_LEVELS_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_LEVELS_CONFIG, GimpLevelsConfig))
+#define GIMP_LEVELS_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_LEVELS_CONFIG, GimpLevelsConfigClass))
+#define GIMP_IS_LEVELS_CONFIG(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_LEVELS_CONFIG))
+#define GIMP_IS_LEVELS_CONFIG_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_LEVELS_CONFIG))
+#define GIMP_LEVELS_CONFIG_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_LEVELS_CONFIG, GimpLevelsConfigClass))
+
+
+typedef struct _GimpLevelsConfigClass GimpLevelsConfigClass;
+
+struct _GimpLevelsConfig
+{
+  GimpOperationSettings  parent_instance;
+
+  gboolean               linear;
+
+  GimpHistogramChannel   channel;
+
+  gdouble                low_input[5];
+  gdouble                high_input[5];
+
+  gboolean               clamp_input;
+
+  gdouble                gamma[5];
+
+  gdouble                low_output[5];
+  gdouble                high_output[5];
+
+  gboolean               clamp_output;
+};
+
+struct _GimpLevelsConfigClass
+{
+  GimpOperationSettingsClass  parent_class;
+};
+
+
+GType      gimp_levels_config_get_type         (void) G_GNUC_CONST;
+
+void       gimp_levels_config_reset_channel    (GimpLevelsConfig      *config);
+
+void       gimp_levels_config_stretch          (GimpLevelsConfig      *config,
+                                                GimpHistogram         *histogram,
+                                                gboolean               is_color);
+void       gimp_levels_config_stretch_channel  (GimpLevelsConfig      *config,
+                                                GimpHistogram         *histogram,
+                                                GimpHistogramChannel   channel);
+void       gimp_levels_config_adjust_by_colors (GimpLevelsConfig      *config,
+                                                GimpHistogramChannel   channel,
+                                                const GimpRGB         *black,
+                                                const GimpRGB         *gray,
+                                                const GimpRGB         *white);
+
+GimpCurvesConfig *
+           gimp_levels_config_to_curves_config (GimpLevelsConfig      *config);
+
+gboolean   gimp_levels_config_load_cruft       (GimpLevelsConfig      *config,
+                                                GInputStream          *input,
+                                                GError               **error);
+gboolean   gimp_levels_config_save_cruft       (GimpLevelsConfig      *config,
+                                                GOutputStream         *output,
+                                                GError               **error);
+
+
+#endif /* __GIMP_LEVELS_CONFIG_H__ */
diff --git a/app/operations/gimpoperationborder.c b/app/operations/gimpoperationborder.c
new file mode 100644
index 0000000..e08481c
--- /dev/null
+++ b/app/operations/gimpoperationborder.c
@@ -0,0 +1,748 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationborder.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationborder.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_RADIUS_X,
+  PROP_RADIUS_Y,
+  PROP_FEATHER,
+  PROP_EDGE_LOCK
+};
+
+
+static void     gimp_operation_border_get_property (GObject      *object,
+                                                    guint         property_id,
+                                                    GValue       *value,
+                                                    GParamSpec   *pspec);
+static void     gimp_operation_border_set_property (GObject      *object,
+                                                    guint         property_id,
+                                                    const GValue *value,
+                                                    GParamSpec   *pspec);
+
+static GeglRectangle
+gimp_operation_border_get_required_for_output (GeglOperation       *self,
+                                               const gchar         *input_pad,
+                                               const GeglRectangle *roi);
+static GeglRectangle
+      gimp_operation_border_get_cached_region (GeglOperation       *self,
+                                               const GeglRectangle *roi);
+static void     gimp_operation_border_prepare (GeglOperation       *operation);
+static gboolean gimp_operation_border_process (GeglOperation       *operation,
+                                               GeglBuffer          *input,
+                                               GeglBuffer          *output,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationBorder, gimp_operation_border,
+               GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_border_parent_class
+
+
+static void
+gimp_operation_border_class_init (GimpOperationBorderClass *klass)
+{
+  GObjectClass             *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationFilterClass *filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_border_set_property;
+  object_class->get_property   = gimp_operation_border_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:border",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Border operation",
+                                 NULL);
+
+  operation_class->prepare                 = gimp_operation_border_prepare;
+  operation_class->get_required_for_output = gimp_operation_border_get_required_for_output;
+  operation_class->get_cached_region       = gimp_operation_border_get_cached_region;
+  operation_class->threaded                = FALSE;
+
+  filter_class->process                    = gimp_operation_border_process;
+
+  g_object_class_install_property (object_class, PROP_RADIUS_X,
+                                   g_param_spec_int ("radius-x",
+                                                     "Radius X",
+                                                     "Border radius in X diection",
+                                                     1, 2342, 1,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_RADIUS_Y,
+                                   g_param_spec_int ("radius-y",
+                                                     "Radius Y",
+                                                     "Border radius in Y diection",
+                                                     1, 2342, 1,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_FEATHER,
+                                   g_param_spec_boolean ("feather",
+                                                         "Feather",
+                                                         "Feather the border",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_EDGE_LOCK,
+                                   g_param_spec_boolean ("edge-lock",
+                                                         "Edge Lock",
+                                                         "Shrink from border",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_border_init (GimpOperationBorder *self)
+{
+}
+
+static void
+gimp_operation_border_get_property (GObject    *object,
+                                    guint       property_id,
+                                    GValue     *value,
+                                    GParamSpec *pspec)
+{
+ GimpOperationBorder *self = GIMP_OPERATION_BORDER (object);
+
+  switch (property_id)
+    {
+    case PROP_RADIUS_X:
+      g_value_set_int (value, self->radius_x);
+      break;
+
+    case PROP_RADIUS_Y:
+      g_value_set_int (value, self->radius_y);
+      break;
+
+    case PROP_FEATHER:
+      g_value_set_boolean (value, self->feather);
+      break;
+
+    case PROP_EDGE_LOCK:
+      g_value_set_boolean (value, self->edge_lock);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_border_set_property (GObject      *object,
+                                    guint         property_id,
+                                    const GValue *value,
+                                    GParamSpec   *pspec)
+{
+  GimpOperationBorder *self = GIMP_OPERATION_BORDER (object);
+
+  switch (property_id)
+    {
+    case PROP_RADIUS_X:
+      self->radius_x = g_value_get_int (value);
+      break;
+
+    case PROP_RADIUS_Y:
+      self->radius_y = g_value_get_int (value);
+      break;
+
+    case PROP_FEATHER:
+      self->feather = g_value_get_boolean (value);
+      break;
+
+    case PROP_EDGE_LOCK:
+      self->edge_lock = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_border_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("Y float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
+}
+
+static GeglRectangle
+gimp_operation_border_get_required_for_output (GeglOperation       *self,
+                                               const gchar         *input_pad,
+                                               const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static GeglRectangle
+gimp_operation_border_get_cached_region (GeglOperation       *self,
+                                         const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static inline void
+rotate_pointers (gfloat  **p,
+                 guint32   n)
+{
+  guint32  i;
+  gfloat  *tmp;
+
+  tmp = p[0];
+
+  for (i = 0; i < n - 1; i++)
+    p[i] = p[i + 1];
+
+  p[i] = tmp;
+}
+
+/* Computes whether pixels in `buf[1]', if they are selected, have neighbouring
+   pixels that are unselected. Put result in `transition'. */
+static void
+compute_transition (gfloat    *transition,
+                    gfloat   **buf,
+                    gint32     width,
+                    gboolean   edge_lock)
+{
+  register gint32 x = 0;
+
+  if (width == 1)
+    {
+      if (buf[1][0] >= 0.5 && (buf[0][0] < 0.5 || buf[2][0] < 0.5))
+        transition[0] = 1.0;
+      else
+        transition[0] = 0.0;
+      return;
+    }
+
+  if (buf[1][0] >= 0.5 && edge_lock)
+    {
+      /* The pixel to the left (outside of the canvas) is considered selected,
+         so we check if there are any unselected pixels in neighbouring pixels
+         _on_ the canvas. */
+      if (buf[0][x] < 0.5 || buf[0][x + 1] < 0.5 ||
+                             buf[1][x + 1] < 0.5 ||
+          buf[2][x] < 0.5 || buf[2][x + 1] < 0.5 )
+        {
+          transition[x] = 1.0;
+        }
+      else
+        {
+          transition[x] = 0.0;
+        }
+    }
+  else if (buf[1][0] >= 0.5 && !edge_lock)
+    {
+      /* We must not care about neighbouring pixels on the image canvas since
+         there always are unselected pixels to the left (which is outside of
+         the image canvas). */
+      transition[x] = 1.0;
+    }
+  else
+    {
+      transition[x] = 0.0;
+    }
+
+  for (x = 1; x < width - 1; x++)
+    {
+      if (buf[1][x] >= 0.5)
+        {
+          if (buf[0][x - 1] < 0.5 || buf[0][x] < 0.5 || buf[0][x + 1] < 0.5 ||
+              buf[1][x - 1] < 0.5 ||                    buf[1][x + 1] < 0.5 ||
+              buf[2][x - 1] < 0.5 || buf[2][x] < 0.5 || buf[2][x + 1] < 0.5)
+            transition[x] = 1.0;
+          else
+            transition[x] = 0.0;
+        }
+      else
+        {
+          transition[x] = 0.0;
+        }
+    }
+
+  if (buf[1][width - 1] >= 0.5 && edge_lock)
+    {
+      /* The pixel to the right (outside of the canvas) is considered selected,
+         so we check if there are any unselected pixels in neighbouring pixels
+         _on_ the canvas. */
+      if ( buf[0][x - 1] < 0.5 || buf[0][x] < 0.5 ||
+           buf[1][x - 1] < 0.5 ||
+           buf[2][x - 1] < 0.5 || buf[2][x] < 0.5)
+        {
+          transition[width - 1] = 1.0;
+        }
+      else
+        {
+          transition[width - 1] = 0.0;
+        }
+    }
+  else if (buf[1][width - 1] >= 0.5 && !edge_lock)
+    {
+      /* We must not care about neighbouring pixels on the image canvas since
+         there always are unselected pixels to the right (which is outside of
+         the image canvas). */
+      transition[width - 1] = 1.0;
+    }
+  else
+    {
+      transition[width - 1] = 0.0;
+    }
+}
+
+static gboolean
+gimp_operation_border_process (GeglOperation       *operation,
+                               GeglBuffer          *input,
+                               GeglBuffer          *output,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  /* This function has no bugs, but if you imagine some you can blame
+   * them on jaycox@gimp.org
+   */
+  GimpOperationBorder *self          = GIMP_OPERATION_BORDER (operation);
+  const Babl          *input_format  = gegl_operation_get_format (operation, "input");
+  const Babl          *output_format = gegl_operation_get_format (operation, "output");
+
+  gint32 i, j, x, y;
+
+  /* A cache used in the algorithm as it works its way down. `buf[1]' is the
+     current row. Thus, at algorithm initialization, `buf[0]' represents the
+     row 'above' the first row of the region. */
+  gfloat  *buf[3];
+
+  /* The resulting selection is calculated row by row, and this buffer holds the
+     output for each individual row, on each iteration. */
+  gfloat  *out;
+
+  /* Keeps track of transitional pixels (pixels that are selected and have
+     unselected neighbouring pixels). */
+  gfloat **transition;
+
+  /* TODO: Figure out role clearly in algorithm. */
+  gint16  *max;
+
+  /* TODO: Figure out role clearly in algorithm. */
+  gfloat **density;
+
+  gint16   last_index;
+
+  /* optimize this case specifically */
+  if (self->radius_x == 1 && self->radius_y == 1)
+    {
+      gfloat *transition;
+      gfloat *source[3];
+
+      for (i = 0; i < 3; i++)
+        source[i] = g_new (gfloat, roi->width);
+
+      transition = g_new (gfloat, roi->width);
+
+      /* With `self->edge_lock', initialize row above image as
+       * selected, otherwise, initialize as unselected.
+       */
+      if (self->edge_lock)
+        {
+          for (i = 0; i < roi->width; i++)
+            source[0][i] = 1.0;
+        }
+      else
+        {
+          memset (source[0], 0, roi->width * sizeof (gfloat));
+        }
+
+      gegl_buffer_get (input,
+                       GEGL_RECTANGLE (roi->x, roi->y + 0,
+                                       roi->width, 1),
+                       1.0, input_format, source[1],
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+      if (roi->height > 1)
+        gegl_buffer_get (input,
+                         GEGL_RECTANGLE (roi->x, roi->y + 1,
+                                         roi->width, 1),
+                         1.0, input_format, source[2],
+                         GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+      else
+        memcpy (source[2], source[1], roi->width * sizeof (gfloat));
+
+      compute_transition (transition, source, roi->width, self->edge_lock);
+      gegl_buffer_set (output,
+                       GEGL_RECTANGLE (roi->x, roi->y,
+                                       roi->width, 1),
+                       0, output_format, transition,
+                       GEGL_AUTO_ROWSTRIDE);
+
+      for (y = 1; y < roi->height; y++)
+        {
+          rotate_pointers (source, 3);
+
+          if (y + 1 < roi->height)
+            {
+              gegl_buffer_get (input,
+                               GEGL_RECTANGLE (roi->x, roi->y + y + 1,
+                                               roi->width, 1),
+                               1.0, input_format, source[2],
+                               GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+            }
+          else
+            {
+              /* Depending on `self->edge_lock', set the row below the
+               * image as either selected or non-selected.
+               */
+              if (self->edge_lock)
+                {
+                  for (i = 0; i < roi->width; i++)
+                    source[2][i] = 1.0;
+                }
+              else
+                {
+                  memset (source[2], 0, roi->width * sizeof (gfloat));
+                }
+            }
+
+          compute_transition (transition, source, roi->width, self->edge_lock);
+          gegl_buffer_set (output,
+                           GEGL_RECTANGLE (roi->x, roi->y + y,
+                                           roi->width, 1),
+                           0, output_format, transition,
+                           GEGL_AUTO_ROWSTRIDE);
+        }
+
+      for (i = 0; i < 3; i++)
+        g_free (source[i]);
+
+      g_free (transition);
+
+      /* Finished handling the radius = 1 special case, return here. */
+      return TRUE;
+    }
+
+  max = g_new (gint16, roi->width + 2 * self->radius_x);
+
+  for (i = 0; i < (roi->width + 2 * self->radius_x); i++)
+    max[i] = self->radius_y + 2;
+
+  max += self->radius_x;
+
+  for (i = 0; i < 3; i++)
+    buf[i] = g_new (gfloat, roi->width);
+
+  transition = g_new (gfloat *, self->radius_y + 1);
+
+  for (i = 0; i < self->radius_y + 1; i++)
+    {
+      transition[i] = g_new (gfloat, roi->width + 2 * self->radius_x);
+      memset (transition[i], 0,
+              (roi->width + 2 * self->radius_x) * sizeof (gfloat));
+      transition[i] += self->radius_x;
+    }
+
+  out = g_new (gfloat, roi->width);
+
+  density = g_new (gfloat *, 2 * self->radius_x + 1);
+  density += self->radius_x;
+
+  /* allocate density[][] */
+  for (x = 0; x < (self->radius_x + 1); x++)
+    {
+      density[ x]  = g_new (gfloat, 2 * self->radius_y + 1);
+      density[ x] += self->radius_y;
+      density[-x]  = density[x];
+    }
+
+  /* compute density[][] */
+  for (x = 0; x < (self->radius_x + 1); x++)
+    {
+      gdouble tmpx, tmpy, dist;
+      gfloat  a;
+
+      if (x > 0)
+        tmpx = x - 0.5;
+      else if (x < 0)
+        tmpx = x + 0.5;
+      else
+        tmpx = 0.0;
+
+      for (y = 0; y < (self->radius_y + 1); y++)
+        {
+          if (y > 0)
+            tmpy = y - 0.5;
+          else if (y < 0)
+            tmpy = y + 0.5;
+          else
+            tmpy = 0.0;
+
+          dist = ((tmpy * tmpy) / (self->radius_y * self->radius_y) +
+                  (tmpx * tmpx) / (self->radius_x * self->radius_x));
+
+          if (dist < 1.0)
+            {
+              if (self->feather)
+                a = 1.0 - sqrt (dist);
+              else
+                a = 1.0;
+            }
+          else
+            {
+              a = 0.0;
+            }
+
+          density[ x][ y] = a;
+          density[ x][-y] = a;
+          density[-x][ y] = a;
+          density[-x][-y] = a;
+        }
+    }
+
+  /* Since the algorithm considerers `buf[0]' to be 'over' the row
+   * currently calculated, we must start with `buf[0]' as non-selected
+   * if there is no `self->edge_lock. If there is an
+   * 'self->edge_lock', initialize the first row to 'selected'. Refer
+   * to bug #350009.
+   */
+  if (self->edge_lock)
+    {
+      for (i = 0; i < roi->width; i++)
+        buf[0][i] = 1.0;
+    }
+  else
+    {
+      memset (buf[0], 0, roi->width * sizeof (gfloat));
+    }
+
+  gegl_buffer_get (input,
+                   GEGL_RECTANGLE (roi->x, roi->y + 0,
+                                   roi->width, 1),
+                   1.0, input_format, buf[1],
+                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  if (roi->height > 1)
+    gegl_buffer_get (input,
+                     GEGL_RECTANGLE (roi->x, roi->y + 1,
+                                     roi->width, 1),
+                     1.0, input_format, buf[2],
+                     GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+  else
+    memcpy (buf[2], buf[1], roi->width * sizeof (gfloat));
+
+  compute_transition (transition[1], buf, roi->width, self->edge_lock);
+
+   /* set up top of image */
+  for (y = 1; y < self->radius_y && y + 1 < roi->height; y++)
+    {
+      rotate_pointers (buf, 3);
+      gegl_buffer_get (input,
+                       GEGL_RECTANGLE (roi->x, roi->y + y + 1,
+                                       roi->width, 1),
+                       1.0, input_format, buf[2],
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+      compute_transition (transition[y + 1], buf, roi->width, self->edge_lock);
+    }
+
+  /* set up max[] for top of image */
+  for (x = 0; x < roi->width; x++)
+    {
+      max[x] = -(self->radius_y + 7);
+
+      for (j = 1; j < self->radius_y + 1; j++)
+        if (transition[j][x])
+          {
+            max[x] = j;
+            break;
+          }
+    }
+
+  /* main calculation loop */
+  for (y = 0; y < roi->height; y++)
+    {
+      rotate_pointers (buf, 3);
+      rotate_pointers (transition, self->radius_y + 1);
+
+      if (y < roi->height - (self->radius_y + 1))
+        {
+          gegl_buffer_get (input,
+                           GEGL_RECTANGLE (roi->x,
+                                           roi->y + y + self->radius_y + 1,
+                                           roi->width, 1),
+                           1.0, input_format, buf[2],
+                           GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+          compute_transition (transition[self->radius_y], buf, roi->width, self->edge_lock);
+        }
+      else
+        {
+          if (self->edge_lock)
+            {
+              memcpy (transition[self->radius_y], transition[self->radius_y - 1], roi->width * sizeof (gfloat));
+            }
+          else
+            {
+              /* No edge lock, set everything 'below canvas' as seen
+               * from the algorithm as unselected.
+               */
+              memset (buf[2], 0, roi->width * sizeof (gfloat));
+              compute_transition (transition[self->radius_y], buf, roi->width, self->edge_lock);
+            }
+        }
+
+      /* update max array */
+      for (x = 0; x < roi->width; x++)
+        {
+          if (max[x] < 1)
+            {
+              if (max[x] <= -self->radius_y)
+                {
+                  if (transition[self->radius_y][x])
+                    max[x] = self->radius_y;
+                  else
+                    max[x]--;
+                }
+              else
+                {
+                  if (transition[-max[x]][x])
+                    max[x] = -max[x];
+                  else if (transition[-max[x] + 1][x])
+                    max[x] = -max[x] + 1;
+                  else
+                    max[x]--;
+                }
+            }
+          else
+            {
+              max[x]--;
+            }
+
+          if (max[x] < -self->radius_y - 1)
+            max[x] = -self->radius_y - 1;
+        }
+
+      last_index = 1;
+
+       /* render scan line */
+      for (x = 0 ; x < roi->width; x++)
+        {
+          gfloat last_max;
+
+          last_index--;
+
+          if (last_index >= 0)
+            {
+              last_max = 0.0;
+
+              for (i = self->radius_x; i >= 0; i--)
+                if (max[x + i] <= self->radius_y && max[x + i] >= -self->radius_y &&
+                    density[i][max[x+i]] > last_max)
+                  {
+                    last_max = density[i][max[x + i]];
+                    last_index = i;
+                  }
+
+              out[x] = last_max;
+            }
+          else
+            {
+              last_max = 0.0;
+
+              for (i = self->radius_x; i >= -self->radius_x; i--)
+                if (max[x + i] <= self->radius_y && max[x + i] >= -self->radius_y &&
+                    density[i][max[x + i]] > last_max)
+                  {
+                    last_max = density[i][max[x + i]];
+                    last_index = i;
+                  }
+
+              out[x] = last_max;
+            }
+
+          if (last_max <= 0.0)
+            {
+              for (i = x + 1; i < roi->width; i++)
+                {
+                  if (max[i] >= -self->radius_y)
+                    break;
+                }
+
+              if (i - x > self->radius_x)
+                {
+                  for (; x < i - self->radius_x; x++)
+                    out[x] = 0;
+
+                  x--;
+                }
+
+              last_index = self->radius_x;
+            }
+        }
+
+      gegl_buffer_set (output,
+                       GEGL_RECTANGLE (roi->x, roi->y + y,
+                                       roi->width, 1),
+                       0, output_format, out,
+                       GEGL_AUTO_ROWSTRIDE);
+    }
+
+  g_free (out);
+
+  for (i = 0; i < 3; i++)
+    g_free (buf[i]);
+
+  max -= self->radius_x;
+  g_free (max);
+
+  for (i = 0; i < self->radius_y + 1; i++)
+    {
+      transition[i] -= self->radius_x;
+      g_free (transition[i]);
+    }
+
+  g_free (transition);
+
+  for (i = 0; i < self->radius_x + 1 ; i++)
+    {
+      density[i] -= self->radius_y;
+      g_free (density[i]);
+    }
+
+  density -= self->radius_x;
+  g_free (density);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationborder.h b/app/operations/gimpoperationborder.h
new file mode 100644
index 0000000..83eb9fa
--- /dev/null
+++ b/app/operations/gimpoperationborder.h
@@ -0,0 +1,58 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationborder.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_BORDER_H__
+#define __GIMP_OPERATION_BORDER_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_BORDER            (gimp_operation_border_get_type ())
+#define GIMP_OPERATION_BORDER(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_BORDER, GimpOperationBorder))
+#define GIMP_OPERATION_BORDER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_BORDER, GimpOperationBorderClass))
+#define GIMP_IS_OPERATION_BORDER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_BORDER))
+#define GIMP_IS_OPERATION_BORDER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_BORDER))
+#define GIMP_OPERATION_BORDER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_BORDER, GimpOperationBorderClass))
+
+
+typedef struct _GimpOperationBorder      GimpOperationBorder;
+typedef struct _GimpOperationBorderClass GimpOperationBorderClass;
+
+struct _GimpOperationBorder
+{
+  GeglOperationFilter  parent_instance;
+
+  gint                 radius_x;
+  gint                 radius_y;
+  gboolean             feather;
+  gboolean             edge_lock;
+};
+
+struct _GimpOperationBorderClass
+{
+  GeglOperationFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_border_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_BORDER_H__ */
diff --git a/app/operations/gimpoperationbrightnesscontrast.c b/app/operations/gimpoperationbrightnesscontrast.c
new file mode 100644
index 0000000..1dd9186
--- /dev/null
+++ b/app/operations/gimpoperationbrightnesscontrast.c
@@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationbrightnesscontrast.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpbrightnesscontrastconfig.h"
+#include "gimpoperationbrightnesscontrast.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_brightness_contrast_process (GeglOperation       *operation,
+                                                            void                *in_buf,
+                                                            void                *out_buf,
+                                                            glong                samples,
+                                                            const GeglRectangle *roi,
+                                                            gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationBrightnessContrast, gimp_operation_brightness_contrast,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_brightness_contrast_parent_class
+
+
+static void
+gimp_operation_brightness_contrast_class_init (GimpOperationBrightnessContrastClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_point_filter_set_property;
+  object_class->get_property   = gimp_operation_point_filter_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:brightness-contrast",
+                                 "categories",  "color",
+                                 "description", _("Adjust brightness and contrast"),
+                                 NULL);
+
+  point_class->process         = gimp_operation_brightness_contrast_process;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "The config object",
+                                                        GIMP_TYPE_BRIGHTNESS_CONTRAST_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_brightness_contrast_init (GimpOperationBrightnessContrast *self)
+{
+}
+
+static inline gfloat
+gimp_operation_brightness_contrast_map (gfloat  value,
+                                        gdouble brightness,
+                                        gdouble slant)
+{
+  /* apply brightness */
+  if (brightness < 0.0)
+    value = value * (1.0 + brightness);
+  else
+    value = value + ((1.0 - value) * brightness);
+
+  value = (value - 0.5) * slant + 0.5;
+
+  return value;
+}
+
+static gboolean
+gimp_operation_brightness_contrast_process (GeglOperation       *operation,
+                                            void                *in_buf,
+                                            void                *out_buf,
+                                            glong                samples,
+                                            const GeglRectangle *roi,
+                                            gint                 level)
+{
+  GimpOperationPointFilter     *point  = GIMP_OPERATION_POINT_FILTER (operation);
+  GimpBrightnessContrastConfig *config = GIMP_BRIGHTNESS_CONTRAST_CONFIG (point->config);
+  gfloat                       *src    = in_buf;
+  gfloat                       *dest   = out_buf;
+  gdouble                       brightness;
+  gdouble                       slant;
+
+  if (! config)
+    return FALSE;
+
+  brightness = config->brightness / 2.0;
+  slant = tan ((config->contrast + 1) * G_PI_4);
+
+  while (samples--)
+    {
+      dest[RED] = gimp_operation_brightness_contrast_map (src[RED],
+                                                          brightness,
+                                                          slant);
+      dest[GREEN] = gimp_operation_brightness_contrast_map (src[GREEN],
+                                                            brightness,
+                                                            slant);
+      dest[BLUE] = gimp_operation_brightness_contrast_map (src[BLUE],
+                                                           brightness,
+                                                           slant);
+      dest[ALPHA] = src[ALPHA];
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationbrightnesscontrast.h b/app/operations/gimpoperationbrightnesscontrast.h
new file mode 100644
index 0000000..d93ff20
--- /dev/null
+++ b/app/operations/gimpoperationbrightnesscontrast.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationbrightnesscontrast.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_BRIGHTNESS_CONTRAST_H__
+#define __GIMP_OPERATION_BRIGHTNESS_CONTRAST_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST            (gimp_operation_brightness_contrast_get_type ())
+#define GIMP_OPERATION_BRIGHTNESS_CONTRAST(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST, GimpOperationBrightnessContrast))
+#define GIMP_OPERATION_BRIGHTNESS_CONTRAST_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST, GimpOperationBrightnessContrastClass))
+#define GIMP_IS_OPERATION_BRIGHTNESS_CONTRAST(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST))
+#define GIMP_IS_OPERATION_BRIGHTNESS_CONTRAST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST))
+#define GIMP_OPERATION_BRIGHTNESS_CONTRAST_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_BRIGHTNESS_CONTRAST, GimpOperationBrightnessContrastClass))
+
+
+typedef struct _GimpOperationBrightnessContrast      GimpOperationBrightnessContrast;
+typedef struct _GimpOperationBrightnessContrastClass GimpOperationBrightnessContrastClass;
+
+struct _GimpOperationBrightnessContrast
+{
+  GimpOperationPointFilter  parent_instance;
+};
+
+struct _GimpOperationBrightnessContrastClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_brightness_contrast_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_BRIGHTNESS_CONTRAST_H__ */
diff --git a/app/operations/gimpoperationbuffersourcevalidate.c b/app/operations/gimpoperationbuffersourcevalidate.c
new file mode 100644
index 0000000..d277653
--- /dev/null
+++ b/app/operations/gimpoperationbuffersourcevalidate.c
@@ -0,0 +1,307 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationbuffersourcevalidate.c
+ * Copyright (C) 2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl-plugin.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "operations-types.h"
+
+#include "gegl/gimptilehandlervalidate.h"
+
+#include "gimpoperationbuffersourcevalidate.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_BUFFER
+};
+
+
+static void           gimp_operation_buffer_source_validate_dispose          (GObject                           *object);
+static void           gimp_operation_buffer_source_validate_get_property     (GObject                           *object,
+                                                                              guint                              property_id,
+                                                                              GValue                            *value,
+                                                                              GParamSpec                        *pspec);
+static void           gimp_operation_buffer_source_validate_set_property     (GObject                           *object,
+                                                                              guint                              property_id,
+                                                                              const GValue                      *value,
+                                                                              GParamSpec                        *pspec);
+
+static GeglRectangle  gimp_operation_buffer_source_validate_get_bounding_box (GeglOperation                     *operation);
+static void           gimp_operation_buffer_source_validate_prepare          (GeglOperation                     *operation);
+static gboolean       gimp_operation_buffer_source_validate_process          (GeglOperation                     *operation,
+                                                                              GeglOperationContext              *context,
+                                                                              const gchar                       *output_pad,
+                                                                              const GeglRectangle               *result,
+                                                                              gint                               level);
+
+static void           gimp_operation_buffer_source_validate_invalidate       (gpointer                           object,
+                                                                              const GeglRectangle               *rect,
+                                                                              GimpOperationBufferSourceValidate *buffer_source_validate);
+
+
+G_DEFINE_TYPE (GimpOperationBufferSourceValidate, gimp_operation_buffer_source_validate,
+               GEGL_TYPE_OPERATION_SOURCE)
+
+#define parent_class gimp_operation_buffer_source_validate_parent_class
+
+
+static void
+gimp_operation_buffer_source_validate_class_init (GimpOperationBufferSourceValidateClass *klass)
+{
+  GObjectClass       *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+
+  object_class->dispose             = gimp_operation_buffer_source_validate_dispose;
+  object_class->set_property        = gimp_operation_buffer_source_validate_set_property;
+  object_class->get_property        = gimp_operation_buffer_source_validate_get_property;
+
+  operation_class->get_bounding_box = gimp_operation_buffer_source_validate_get_bounding_box;
+  operation_class->prepare          = gimp_operation_buffer_source_validate_prepare;
+  operation_class->process          = gimp_operation_buffer_source_validate_process;
+
+  operation_class->threaded         = FALSE;
+  operation_class->cache_policy     = GEGL_CACHE_POLICY_NEVER;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:buffer-source-validate",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Buffer-Source Validate operation",
+                                 NULL);
+
+  g_object_class_install_property (object_class, PROP_BUFFER,
+                                   g_param_spec_object ("buffer",
+                                                        "Buffer",
+                                                        "Input buffer",
+                                                        GEGL_TYPE_BUFFER,
+                                                        G_PARAM_READWRITE));
+}
+
+static void
+gimp_operation_buffer_source_validate_init (GimpOperationBufferSourceValidate *self)
+{
+}
+
+static void
+gimp_operation_buffer_source_validate_dispose (GObject *object)
+{
+  GimpOperationBufferSourceValidate *buffer_source_validate = GIMP_OPERATION_BUFFER_SOURCE_VALIDATE (object);
+
+  if (buffer_source_validate->buffer)
+    {
+      GimpTileHandlerValidate *validate_handler;
+
+      validate_handler = gimp_tile_handler_validate_get_assigned (
+        buffer_source_validate->buffer);
+
+      if (validate_handler)
+        {
+          g_signal_connect (
+            validate_handler,
+            "invalidated",
+            G_CALLBACK (gimp_operation_buffer_source_validate_invalidate),
+            buffer_source_validate);
+        }
+
+      g_signal_handlers_disconnect_by_func (
+        buffer_source_validate->buffer,
+        gimp_operation_buffer_source_validate_invalidate,
+        buffer_source_validate);
+
+      g_clear_object (&buffer_source_validate->buffer);
+    }
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_buffer_source_validate_get_property (GObject    *object,
+                                                    guint       property_id,
+                                                    GValue     *value,
+                                                    GParamSpec *pspec)
+{
+  GimpOperationBufferSourceValidate *buffer_source_validate = GIMP_OPERATION_BUFFER_SOURCE_VALIDATE (object);
+
+  switch (property_id)
+    {
+    case PROP_BUFFER:
+      g_value_set_object (value, buffer_source_validate->buffer);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_buffer_source_validate_set_property (GObject      *object,
+                                                    guint         property_id,
+                                                    const GValue *value,
+                                                    GParamSpec   *pspec)
+{
+  GimpOperationBufferSourceValidate *buffer_source_validate = GIMP_OPERATION_BUFFER_SOURCE_VALIDATE (object);
+
+  switch (property_id)
+    {
+    case PROP_BUFFER:
+      {
+        if (buffer_source_validate->buffer)
+          {
+            GimpTileHandlerValidate *validate_handler;
+
+            validate_handler = gimp_tile_handler_validate_get_assigned (
+              buffer_source_validate->buffer);
+
+            gimp_operation_buffer_source_validate_invalidate (
+              buffer_source_validate->buffer,
+              gegl_buffer_get_extent (buffer_source_validate->buffer),
+              buffer_source_validate);
+
+            g_signal_handlers_disconnect_by_func (
+              buffer_source_validate->buffer,
+              gimp_operation_buffer_source_validate_invalidate,
+              buffer_source_validate);
+
+            if (validate_handler)
+              {
+                g_signal_handlers_disconnect_by_func (
+                  validate_handler,
+                  gimp_operation_buffer_source_validate_invalidate,
+                  buffer_source_validate);
+              }
+
+            g_clear_object (&buffer_source_validate->buffer);
+          }
+
+        buffer_source_validate->buffer = g_value_dup_object (value);
+
+        if (buffer_source_validate->buffer)
+          {
+            GimpTileHandlerValidate *validate_handler;
+
+            validate_handler = gimp_tile_handler_validate_get_assigned (
+              buffer_source_validate->buffer);
+
+            if (validate_handler)
+              {
+                g_signal_connect (
+                  validate_handler,
+                  "invalidated",
+                  G_CALLBACK (gimp_operation_buffer_source_validate_invalidate),
+                  buffer_source_validate);
+              }
+
+            gegl_buffer_signal_connect (
+              buffer_source_validate->buffer,
+              "changed",
+              G_CALLBACK (gimp_operation_buffer_source_validate_invalidate),
+              buffer_source_validate);
+
+            gimp_operation_buffer_source_validate_invalidate (
+              buffer_source_validate->buffer,
+              gegl_buffer_get_extent (buffer_source_validate->buffer),
+              buffer_source_validate);
+          }
+      }
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static GeglRectangle
+gimp_operation_buffer_source_validate_get_bounding_box (GeglOperation *operation)
+{
+  GimpOperationBufferSourceValidate *buffer_source_validate = GIMP_OPERATION_BUFFER_SOURCE_VALIDATE (operation);
+
+  GeglRectangle result = {};
+
+  if (buffer_source_validate->buffer)
+    result = *gegl_buffer_get_extent (buffer_source_validate->buffer);
+
+  return result;
+}
+
+static void
+gimp_operation_buffer_source_validate_prepare (GeglOperation *operation)
+{
+  GimpOperationBufferSourceValidate *buffer_source_validate = GIMP_OPERATION_BUFFER_SOURCE_VALIDATE (operation);
+  const Babl                        *format                 = NULL;
+
+  if (buffer_source_validate->buffer)
+    format = gegl_buffer_get_format (buffer_source_validate->buffer);
+
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+gimp_operation_buffer_source_validate_process (GeglOperation        *operation,
+                                               GeglOperationContext *context,
+                                               const gchar          *output_pad,
+                                               const GeglRectangle  *result,
+                                               gint                  level)
+{
+  GimpOperationBufferSourceValidate *buffer_source_validate = GIMP_OPERATION_BUFFER_SOURCE_VALIDATE (operation);
+  GeglBuffer                        *buffer                 = buffer_source_validate->buffer;
+
+  if (buffer)
+    {
+      GimpTileHandlerValidate *validate_handler;
+
+      validate_handler = gimp_tile_handler_validate_get_assigned (buffer);
+
+      if (validate_handler)
+        {
+          GeglRectangle rect;
+
+          /* align the rectangle to the tile grid */
+          gegl_rectangle_align_to_buffer (
+            &rect, result, buffer_source_validate->buffer,
+            GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
+
+          gimp_tile_handler_validate_validate (validate_handler,
+                                               buffer_source_validate->buffer,
+                                               &rect,
+                                               TRUE, FALSE);
+        }
+
+      gegl_operation_context_set_object (context, "output", G_OBJECT (buffer));
+
+      gegl_object_set_has_forked (G_OBJECT (buffer));
+    }
+
+  return TRUE;
+}
+
+static void
+gimp_operation_buffer_source_validate_invalidate (gpointer                           object,
+                                                  const GeglRectangle               *rect,
+                                                  GimpOperationBufferSourceValidate *buffer_source_validate)
+{
+  gegl_operation_invalidate (GEGL_OPERATION (buffer_source_validate),
+                             rect, FALSE);
+}
diff --git a/app/operations/gimpoperationbuffersourcevalidate.h b/app/operations/gimpoperationbuffersourcevalidate.h
new file mode 100644
index 0000000..c47c333
--- /dev/null
+++ b/app/operations/gimpoperationbuffersourcevalidate.h
@@ -0,0 +1,52 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationbuffersourcevalidate.h
+ * Copyright (C) 2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_BUFFER_SOURCE_VALIDATE_H__
+#define __GIMP_OPERATION_BUFFER_SOURCE_VALIDATE_H__
+
+
+#define GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE            (gimp_operation_buffer_source_validate_get_type ())
+#define GIMP_OPERATION_BUFFER_SOURCE_VALIDATE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE, GimpOperationBufferSourceValidate))
+#define GIMP_OPERATION_BUFFER_SOURCE_VALIDATE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE, GimpOperationBufferSourceValidateClass))
+#define GIMP_IS_OPERATION_BUFFER_SOURCE_VALIDATE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE))
+#define GIMP_IS_OPERATION_BUFFER_SOURCE_VALIDATE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE))
+#define GIMP_OPERATION_BUFFER_SOURCE_VALIDATE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_BUFFER_SOURCE_VALIDATE, GimpOperationBufferSourceValidateClass))
+
+
+typedef struct _GimpOperationBufferSourceValidate      GimpOperationBufferSourceValidate;
+typedef struct _GimpOperationBufferSourceValidateClass GimpOperationBufferSourceValidateClass;
+
+struct _GimpOperationBufferSourceValidate
+{
+  GeglOperationSource  parent_instance;
+
+  GeglBuffer          *buffer;
+};
+
+struct _GimpOperationBufferSourceValidateClass
+{
+  GeglOperationSourceClass  parent_class;
+};
+
+
+GType   gimp_operation_buffer_source_validate_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_BUFFER_SOURCE_VALIDATE_H__ */
diff --git a/app/operations/gimpoperationcagecoefcalc.c b/app/operations/gimpoperationcagecoefcalc.c
new file mode 100644
index 0000000..ba8cd3f
--- /dev/null
+++ b/app/operations/gimpoperationcagecoefcalc.c
@@ -0,0 +1,294 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpoperationcagecoefcalc.c
+ * Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationcagecoefcalc.h"
+#include "gimpcageconfig.h"
+
+#include "gimp-intl.h"
+
+
+static void           gimp_operation_cage_coef_calc_finalize         (GObject              *object);
+static void           gimp_operation_cage_coef_calc_get_property     (GObject              *object,
+                                                                      guint                 property_id,
+                                                                      GValue               *value,
+                                                                      GParamSpec           *pspec);
+static void           gimp_operation_cage_coef_calc_set_property     (GObject              *object,
+                                                                      guint                 property_id,
+                                                                      const GValue         *value,
+                                                                      GParamSpec           *pspec);
+
+static void           gimp_operation_cage_coef_calc_prepare          (GeglOperation        *operation);
+static GeglRectangle  gimp_operation_cage_coef_calc_get_bounding_box (GeglOperation        *operation);
+static gboolean       gimp_operation_cage_coef_calc_process          (GeglOperation        *operation,
+                                                                      GeglBuffer           *output,
+                                                                      const GeglRectangle  *roi,
+                                                                      gint                  level);
+
+
+G_DEFINE_TYPE (GimpOperationCageCoefCalc, gimp_operation_cage_coef_calc,
+               GEGL_TYPE_OPERATION_SOURCE)
+
+#define parent_class gimp_operation_cage_coef_calc_parent_class
+
+
+static void
+gimp_operation_cage_coef_calc_class_init (GimpOperationCageCoefCalcClass *klass)
+{
+  GObjectClass             *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationSourceClass *source_class    = GEGL_OPERATION_SOURCE_CLASS (klass);
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:cage-coef-calc",
+                                 "categories",  "transform",
+                                 "description", _("Compute a set of coefficient buffer for the GIMP cage tool"),
+                                 NULL);
+
+  operation_class->prepare            = gimp_operation_cage_coef_calc_prepare;
+  operation_class->get_bounding_box   = gimp_operation_cage_coef_calc_get_bounding_box;
+  operation_class->cache_policy       = GEGL_CACHE_POLICY_ALWAYS;
+  operation_class->get_cached_region  = NULL;
+
+  source_class->process               = gimp_operation_cage_coef_calc_process;
+
+  object_class->get_property          = gimp_operation_cage_coef_calc_get_property;
+  object_class->set_property          = gimp_operation_cage_coef_calc_set_property;
+  object_class->finalize              = gimp_operation_cage_coef_calc_finalize;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_CAGE_COEF_CALC_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "A GimpCageConfig object, that define the transformation",
+                                                        GIMP_TYPE_CAGE_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_cage_coef_calc_init (GimpOperationCageCoefCalc *self)
+{
+}
+
+static void
+gimp_operation_cage_coef_calc_finalize (GObject *object)
+{
+  GimpOperationCageCoefCalc *self = GIMP_OPERATION_CAGE_COEF_CALC (object);
+
+  g_clear_object (&self->config);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_cage_coef_calc_get_property (GObject    *object,
+                                            guint       property_id,
+                                            GValue     *value,
+                                            GParamSpec *pspec)
+{
+  GimpOperationCageCoefCalc *self = GIMP_OPERATION_CAGE_COEF_CALC (object);
+
+  switch (property_id)
+    {
+    case GIMP_OPERATION_CAGE_COEF_CALC_PROP_CONFIG:
+      g_value_set_object (value, self->config);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_cage_coef_calc_set_property (GObject      *object,
+                                            guint         property_id,
+                                            const GValue *value,
+                                            GParamSpec   *pspec)
+{
+  GimpOperationCageCoefCalc *self = GIMP_OPERATION_CAGE_COEF_CALC (object);
+
+  switch (property_id)
+    {
+    case GIMP_OPERATION_CAGE_COEF_CALC_PROP_CONFIG:
+      if (self->config)
+        g_object_unref (self->config);
+      self->config = g_value_dup_object (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_operation_cage_coef_calc_is_on_straight (GimpVector2 *d1,
+                                              GimpVector2 *d2,
+                                              GimpVector2 *p)
+{
+  GimpVector2 v1, v2;
+  gfloat      deter;
+
+  v1.x = p->x - d1->x;
+  v1.y = p->y - d1->y;
+  v2.x = d2->x - d1->x;
+  v2.y = d2->y - d1->y;
+
+  gimp_vector2_normalize (&v1);
+  gimp_vector2_normalize (&v2);
+
+  deter = v1.x * v2.y - v2.x * v1.y;
+
+  return (deter < 0.000000001) && (deter > -0.000000001);
+}
+
+static void
+gimp_operation_cage_coef_calc_prepare (GeglOperation *operation)
+{
+  GimpOperationCageCoefCalc *occc   = GIMP_OPERATION_CAGE_COEF_CALC (operation);
+  GimpCageConfig            *config = GIMP_CAGE_CONFIG (occc->config);
+
+  gegl_operation_set_format (operation,
+                             "output",
+                             babl_format_n (babl_type ("float"),
+                                            2 * gimp_cage_config_get_n_points (config)));
+}
+
+static GeglRectangle
+gimp_operation_cage_coef_calc_get_bounding_box (GeglOperation *operation)
+{
+  GimpOperationCageCoefCalc *occc   = GIMP_OPERATION_CAGE_COEF_CALC (operation);
+  GimpCageConfig            *config = GIMP_CAGE_CONFIG (occc->config);
+
+  return gimp_cage_config_get_bounding_box (config);
+}
+
+static gboolean
+gimp_operation_cage_coef_calc_process (GeglOperation       *operation,
+                                       GeglBuffer          *output,
+                                       const GeglRectangle *roi,
+                                       gint                 level)
+{
+  GimpOperationCageCoefCalc *occc   = GIMP_OPERATION_CAGE_COEF_CALC (operation);
+  GimpCageConfig            *config = GIMP_CAGE_CONFIG (occc->config);
+
+  const Babl *format;
+
+  GeglBufferIterator *it;
+  guint               n_cage_vertices;
+  GimpCagePoint      *current, *last;
+
+  if (! config)
+    return FALSE;
+
+  format = babl_format_n (babl_type ("float"), 2 * gimp_cage_config_get_n_points (config));
+
+  n_cage_vertices   = gimp_cage_config_get_n_points (config);
+
+  it = gegl_buffer_iterator_new (output, roi, 0, format,
+                                 GEGL_ACCESS_READWRITE, GEGL_ABYSS_NONE, 1);
+
+  while (gegl_buffer_iterator_next (it))
+    {
+      /* iterate inside the roi */
+      gint  n_pixels = it->length;
+      gint  x = it->items[0].roi.x; /* initial x                   */
+      gint  y = it->items[0].roi.y; /*           and y coordinates */
+      gint  j;
+
+      gfloat      *coef = it->items[0].data;
+
+      while(n_pixels--)
+        {
+          if (gimp_cage_config_point_inside(config, x, y))
+            {
+              last = &(g_array_index (config->cage_points, GimpCagePoint, 0));
+
+              for( j = 0; j < n_cage_vertices; j++)
+                {
+                  GimpVector2 v1,v2,a,b,p;
+                  gdouble BA,SRT,L0,L1,A0,A1,A10,L10, Q,S,R, absa;
+
+                  current = &(g_array_index (config->cage_points, GimpCagePoint, (j+1) % n_cage_vertices));
+                  v1 = last->src_point;
+                  v2 = current->src_point;
+                  p.x = x;
+                  p.y = y;
+                  a.x = v2.x - v1.x;
+                  a.y = v2.y - v1.y;
+                  absa = gimp_vector2_length (&a);
+
+                  b.x = v1.x - x;
+                  b.y = v1.y - y;
+                  Q = a.x * a.x + a.y * a.y;
+                  S = b.x * b.x + b.y * b.y;
+                  R = 2.0 * (a.x * b.x + a.y * b.y);
+                  BA = b.x * a.y - b.y * a.x;
+                  SRT = sqrt(4.0 * S * Q - R * R);
+
+                  L0 = log(S);
+                  L1 = log(S + Q + R);
+                  A0 = atan2(R, SRT) / SRT;
+                  A1 = atan2(2.0 * Q + R, SRT) / SRT;
+                  A10 = A1 - A0;
+                  L10 = L1 - L0;
+
+                  /* edge coef */
+                  coef[j + n_cage_vertices] = (-absa / (4.0 * G_PI)) * ((4.0*S-(R*R)/Q) * A10 + (R / (2.0 * Q)) * L10 + L1 - 2.0);
+
+                  if (isnan(coef[j + n_cage_vertices]))
+                    {
+                      coef[j + n_cage_vertices] = 0.0;
+                    }
+
+                  /* vertice coef */
+                  if (!gimp_operation_cage_coef_calc_is_on_straight (&v1, &v2, &p))
+                    {
+                      coef[j] += (BA / (2.0 * G_PI)) * (L10 /(2.0*Q) - A10 * (2.0 + R / Q));
+                      coef[(j+1)%n_cage_vertices] -= (BA / (2.0 * G_PI)) * (L10 / (2.0 * Q) - A10 * (R / Q));
+                    }
+
+                  last = current;
+                }
+            }
+
+          coef += 2 * n_cage_vertices;
+
+          /* update x and y coordinates */
+          x++;
+          if (x >= (it->items[0].roi.x + it->items[0].roi.width))
+            {
+              x = it->items[0].roi.x;
+              y++;
+            }
+        }
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationcagecoefcalc.h b/app/operations/gimpoperationcagecoefcalc.h
new file mode 100644
index 0000000..e63be27
--- /dev/null
+++ b/app/operations/gimpoperationcagecoefcalc.h
@@ -0,0 +1,62 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpoperationcagecoefcalc.h
+ * Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_CAGE_COEF_CALC_H__
+#define __GIMP_OPERATION_CAGE_COEF_CALC_H__
+
+
+#include <gegl-plugin.h>
+#include <operation/gegl-operation-source.h>
+
+
+enum
+{
+  GIMP_OPERATION_CAGE_COEF_CALC_PROP_0,
+  GIMP_OPERATION_CAGE_COEF_CALC_PROP_CONFIG
+};
+
+
+#define GIMP_TYPE_OPERATION_CAGE_COEF_CALC            (gimp_operation_cage_coef_calc_get_type ())
+#define GIMP_OPERATION_CAGE_COEF_CALC(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_CAGE_COEF_CALC, GimpOperationCageCoefCalc))
+#define GIMP_OPERATION_CAGE_COEF_CALC_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_CAGE_COEF_CALC, GimpOperationCageCoefCalcClass))
+#define GIMP_IS_OPERATION_CAGE_COEF_CALC(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_CAGE_COEF_CALC))
+#define GIMP_IS_OPERATION_CAGE_COEF_CALC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_CAGE_COEF_CALC))
+#define GIMP_OPERATION_CAGE_COEF_CALC_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_CAGE_COEF_CALC, GimpOperationCageCoefCalcClass))
+
+
+typedef struct _GimpOperationCageCoefCalc      GimpOperationCageCoefCalc;
+typedef struct _GimpOperationCageCoefCalcClass GimpOperationCageCoefCalcClass;
+
+struct _GimpOperationCageCoefCalc
+{
+  GeglOperationSource  parent_instance;
+
+  GimpCageConfig      *config;
+};
+
+struct _GimpOperationCageCoefCalcClass
+{
+  GeglOperationSourceClass  parent_class;
+};
+
+
+GType   gimp_operation_cage_coef_calc_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_CAGE_COEF_CALC_H__ */
diff --git a/app/operations/gimpoperationcagetransform.c b/app/operations/gimpoperationcagetransform.c
new file mode 100644
index 0000000..d2f0450
--- /dev/null
+++ b/app/operations/gimpoperationcagetransform.c
@@ -0,0 +1,603 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpoperationcage.c
+ * Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationcagetransform.h"
+#include "gimpcageconfig.h"
+
+#include "gimp-intl.h"
+
+enum
+{
+  PROP_0,
+  PROP_CONFIG,
+  PROP_FILL,
+};
+
+
+static void         gimp_operation_cage_transform_finalize                (GObject             *object);
+static void         gimp_operation_cage_transform_get_property            (GObject             *object,
+                                                                           guint                property_id,
+                                                                           GValue              *value,
+                                                                           GParamSpec          *pspec);
+static void         gimp_operation_cage_transform_set_property            (GObject             *object,
+                                                                           guint                property_id,
+                                                                           const GValue        *value,
+                                                                           GParamSpec          *pspec);
+static void         gimp_operation_cage_transform_prepare                 (GeglOperation       *operation);
+static gboolean     gimp_operation_cage_transform_process                 (GeglOperation       *operation,
+                                                                           GeglBuffer          *in_buf,
+                                                                           GeglBuffer          *aux_buf,
+                                                                           GeglBuffer          *out_buf,
+                                                                           const GeglRectangle *roi,
+                                                                           gint                 level);
+static void         gimp_operation_cage_transform_interpolate_source_coords_recurs
+                                                                          (GimpOperationCageTransform  *oct,
+                                                                           GeglBuffer          *out_buf,
+                                                                           const GeglRectangle *roi,
+                                                                           GimpVector2          p1_s,
+                                                                           GimpVector2          p1_d,
+                                                                           GimpVector2          p2_s,
+                                                                           GimpVector2          p2_d,
+                                                                           GimpVector2          p3_s,
+                                                                           GimpVector2          p3_d,
+                                                                           gint                 recursion_depth,
+                                                                           gfloat              *coords);
+static GimpVector2  gimp_cage_transform_compute_destination               (GimpCageConfig      *config,
+                                                                           gfloat              *coef,
+                                                                           GeglSampler         *coef_sampler,
+                                                                           GimpVector2          coords);
+GeglRectangle       gimp_operation_cage_transform_get_cached_region       (GeglOperation       *operation,
+                                                                           const GeglRectangle *roi);
+GeglRectangle       gimp_operation_cage_transform_get_required_for_output (GeglOperation       *operation,
+                                                                           const gchar         *input_pad,
+                                                                           const GeglRectangle *roi);
+GeglRectangle       gimp_operation_cage_transform_get_bounding_box        (GeglOperation       *operation);
+
+
+G_DEFINE_TYPE (GimpOperationCageTransform, gimp_operation_cage_transform,
+                      GEGL_TYPE_OPERATION_COMPOSER)
+
+#define parent_class gimp_operation_cage_transform_parent_class
+
+
+static void
+gimp_operation_cage_transform_class_init (GimpOperationCageTransformClass *klass)
+{
+  GObjectClass               *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass         *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationComposerClass *filter_class    = GEGL_OPERATION_COMPOSER_CLASS (klass);
+
+  object_class->get_property               = gimp_operation_cage_transform_get_property;
+  object_class->set_property               = gimp_operation_cage_transform_set_property;
+  object_class->finalize                   = gimp_operation_cage_transform_finalize;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:cage-transform",
+                                 "categories",  "transform",
+                                 "description", _("Convert a set of coefficient buffer to a coordinate buffer for the GIMP cage tool"),
+                                 NULL);
+
+  operation_class->prepare                 = gimp_operation_cage_transform_prepare;
+
+  operation_class->get_required_for_output = gimp_operation_cage_transform_get_required_for_output;
+  operation_class->get_cached_region       = gimp_operation_cage_transform_get_cached_region;
+  operation_class->get_bounding_box        = gimp_operation_cage_transform_get_bounding_box;
+  /* XXX Temporarily disable multi-threading on this operation because
+   * it is much faster when single-threaded. See bug 787663.
+   */
+  operation_class->threaded                = FALSE;
+
+  filter_class->process                    = gimp_operation_cage_transform_process;
+
+  g_object_class_install_property (object_class, PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "A GimpCageConfig object, that define the transformation",
+                                                        GIMP_TYPE_CAGE_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_FILL,
+                                   g_param_spec_boolean ("fill-plain-color",
+                                                         _("Fill with plain color"),
+                                                         _("Fill the original position of the cage with a plain color"),
+                                                         FALSE,
+                                                         G_PARAM_READWRITE));
+}
+
+static void
+gimp_operation_cage_transform_init (GimpOperationCageTransform *self)
+{
+  self->format_coords = babl_format_n(babl_type("float"), 2);
+}
+
+static void
+gimp_operation_cage_transform_finalize (GObject *object)
+{
+  GimpOperationCageTransform *self = GIMP_OPERATION_CAGE_TRANSFORM (object);
+
+  g_clear_object (&self->config);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_cage_transform_get_property (GObject    *object,
+                                            guint       property_id,
+                                            GValue     *value,
+                                            GParamSpec *pspec)
+{
+  GimpOperationCageTransform *self = GIMP_OPERATION_CAGE_TRANSFORM (object);
+
+  switch (property_id)
+    {
+    case PROP_CONFIG:
+      g_value_set_object (value, self->config);
+      break;
+    case PROP_FILL:
+      g_value_set_boolean (value, self->fill_plain_color);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_cage_transform_set_property (GObject      *object,
+                                            guint         property_id,
+                                            const GValue *value,
+                                            GParamSpec   *pspec)
+{
+  GimpOperationCageTransform *self = GIMP_OPERATION_CAGE_TRANSFORM (object);
+
+  switch (property_id)
+    {
+    case PROP_CONFIG:
+      if (self->config)
+        g_object_unref (self->config);
+      self->config = g_value_dup_object (value);
+      break;
+    case PROP_FILL:
+      self->fill_plain_color = g_value_get_boolean (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_cage_transform_prepare (GeglOperation *operation)
+{
+  GimpOperationCageTransform *oct    = GIMP_OPERATION_CAGE_TRANSFORM (operation);
+  GimpCageConfig             *config = GIMP_CAGE_CONFIG (oct->config);
+
+  gegl_operation_set_format (operation, "input",
+                             babl_format_n (babl_type ("float"),
+                                            2 * gimp_cage_config_get_n_points (config)));
+  gegl_operation_set_format (operation, "output",
+                             babl_format_n (babl_type ("float"), 2));
+}
+
+static gboolean
+gimp_operation_cage_transform_process (GeglOperation       *operation,
+                                       GeglBuffer          *in_buf,
+                                       GeglBuffer          *aux_buf,
+                                       GeglBuffer          *out_buf,
+                                       const GeglRectangle *roi,
+                                       gint                 level)
+{
+  GimpOperationCageTransform *oct    = GIMP_OPERATION_CAGE_TRANSFORM (operation);
+  GimpCageConfig             *config = GIMP_CAGE_CONFIG (oct->config);
+  GeglRectangle               cage_bb;
+  gfloat                     *coords;
+  gfloat                     *coef;
+  const Babl                 *format_coef;
+  GeglSampler                *coef_sampler;
+  GimpVector2                 plain_color;
+  GeglBufferIterator         *it;
+  gint                        x, y;
+  gboolean                    output_set;
+  GimpCagePoint              *point;
+  guint                       n_cage_vertices;
+
+  /* pre-fill the out buffer with no-displacement coordinate */
+  it      = gegl_buffer_iterator_new (out_buf, roi, 0, NULL,
+                                      GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
+  cage_bb = gimp_cage_config_get_bounding_box (config);
+
+  point = &(g_array_index (config->cage_points, GimpCagePoint, 0));
+  plain_color.x = (gint) point->src_point.x;
+  plain_color.y = (gint) point->src_point.y;
+
+  n_cage_vertices = gimp_cage_config_get_n_points (config);
+
+  while (gegl_buffer_iterator_next (it))
+    {
+      /* iterate inside the roi */
+      gint    n_pixels = it->length;
+      gfloat *output   = it->items[0].data;
+
+      x = it->items[0].roi.x; /* initial x         */
+      y = it->items[0].roi.y; /* and y coordinates */
+
+      while (n_pixels--)
+        {
+          output_set = FALSE;
+          if (oct->fill_plain_color)
+            {
+              if (x > cage_bb.x &&
+                  y > cage_bb.y &&
+                  x < cage_bb.x + cage_bb.width &&
+                  y < cage_bb.y + cage_bb.height)
+                {
+                  if (gimp_cage_config_point_inside (config, x, y))
+                    {
+                      output[0] = plain_color.x;
+                      output[1] = plain_color.y;
+                      output_set = TRUE;
+                    }
+                }
+            }
+          if (!output_set)
+            {
+              output[0] = x + 0.5;
+              output[1] = y + 0.5;
+            }
+
+          output += 2;
+
+          /* update x and y coordinates */
+          x++;
+          if (x >= (it->items[0].roi.x + it->items[0].roi.width))
+            {
+              x = it->items[0].roi.x;
+              y++;
+            }
+        }
+    }
+
+  if (! aux_buf)
+    return TRUE;
+
+  gegl_operation_progress (operation, 0.0, "");
+
+  /* pre-allocate memory outside of the loop */
+  coords       = g_slice_alloc (2 * sizeof (gfloat));
+  coef         = g_malloc (n_cage_vertices * 2 * sizeof (gfloat));
+  format_coef  = babl_format_n (babl_type ("float"), 2 * n_cage_vertices);
+  coef_sampler = gegl_buffer_sampler_new (aux_buf,
+                                          format_coef, GEGL_SAMPLER_NEAREST);
+
+  /* compute, reverse and interpolate the transformation */
+  for (y = cage_bb.y; y < cage_bb.y + cage_bb.height - 1; y++)
+    {
+      GimpVector2 p1_d, p2_d, p3_d, p4_d;
+      GimpVector2 p1_s, p2_s, p3_s, p4_s;
+
+      p1_s.y = y;
+      p2_s.y = y+1;
+      p3_s.y = y+1;
+      p3_s.x = cage_bb.x;
+      p4_s.y = y;
+      p4_s.x = cage_bb.x;
+
+      p3_d = gimp_cage_transform_compute_destination (config, coef, coef_sampler, p3_s);
+      p4_d = gimp_cage_transform_compute_destination (config, coef, coef_sampler, p4_s);
+
+      for (x = cage_bb.x; x < cage_bb.x + cage_bb.width - 1; x++)
+        {
+          p1_s = p4_s;
+          p2_s = p3_s;
+          p3_s.x = x+1;
+          p4_s.x = x+1;
+
+          p1_d = p4_d;
+          p2_d = p3_d;
+          p3_d = gimp_cage_transform_compute_destination (config, coef, coef_sampler, p3_s);
+          p4_d = gimp_cage_transform_compute_destination (config, coef, coef_sampler, p4_s);
+
+          if (gimp_cage_config_point_inside (config, x, y))
+            {
+              gimp_operation_cage_transform_interpolate_source_coords_recurs (oct,
+                                                                              out_buf,
+                                                                              roi,
+                                                                              p1_s, p1_d,
+                                                                              p2_s, p2_d,
+                                                                              p3_s, p3_d,
+                                                                              0,
+                                                                              coords);
+
+              gimp_operation_cage_transform_interpolate_source_coords_recurs (oct,
+                                                                              out_buf,
+                                                                              roi,
+                                                                              p1_s, p1_d,
+                                                                              p3_s, p3_d,
+                                                                              p4_s, p4_d,
+                                                                              0,
+                                                                              coords);
+            }
+        }
+
+      if ((y - cage_bb.y) % 20 == 0)
+        {
+          gdouble fraction = ((gdouble) (y - cage_bb.y) /
+                              (gdouble) (cage_bb.height));
+
+          /*  0.0 and 1.0 indicate progress start/end, so avoid them  */
+          if (fraction > 0.0 && fraction < 1.0)
+            {
+              gegl_operation_progress (operation, fraction, "");
+            }
+        }
+    }
+
+  g_object_unref (coef_sampler);
+  g_free (coef);
+  g_slice_free1 (2 * sizeof (gfloat), coords);
+
+  gegl_operation_progress (operation, 1.0, "");
+
+  return TRUE;
+}
+
+
+static void
+gimp_operation_cage_transform_interpolate_source_coords_recurs (GimpOperationCageTransform *oct,
+                                                                GeglBuffer                 *out_buf,
+                                                                const GeglRectangle        *roi,
+                                                                GimpVector2                 p1_s,
+                                                                GimpVector2                 p1_d,
+                                                                GimpVector2                 p2_s,
+                                                                GimpVector2                 p2_d,
+                                                                GimpVector2                 p3_s,
+                                                                GimpVector2                 p3_d,
+                                                                gint                        recursion_depth,
+                                                                gfloat                     *coords)
+{
+  gint xmin, xmax, ymin, ymax, x, y;
+
+  /* Stop recursion if all 3 vertices of the triangle are outside the
+   * ROI (left/right or above/below).
+   */
+  if (p1_d.x >= roi->x + roi->width &&
+      p2_d.x >= roi->x + roi->width &&
+      p3_d.x >= roi->x + roi->width) return;
+  if (p1_d.y >= roi->y + roi->height &&
+      p2_d.y >= roi->y + roi->height &&
+      p3_d.y >= roi->y + roi->height) return;
+
+  if (p1_d.x < roi->x &&
+      p2_d.x < roi->x &&
+      p3_d.x < roi->x) return;
+  if (p1_d.y < roi->y &&
+      p2_d.y < roi->y &&
+      p3_d.y < roi->y) return;
+
+  xmin = xmax = lrint (p1_d.x);
+  ymin = ymax = lrint (p1_d.y);
+
+  x = lrint (p2_d.x);
+  xmin = MIN (x, xmin);
+  xmax = MAX (x, xmax);
+
+  x = lrint (p3_d.x);
+  xmin = MIN (x, xmin);
+  xmax = MAX (x, xmax);
+
+  y = lrint (p2_d.y);
+  ymin = MIN (y, ymin);
+  ymax = MAX (y, ymax);
+
+  y = lrint (p3_d.y);
+  ymin = MIN (y, ymin);
+  ymax = MAX (y, ymax);
+
+  /* test if there is no more pixel in the triangle */
+  if (xmin == xmax || ymin == ymax)
+    return;
+
+  /* test if the triangle is implausibly large as manifested by too deep recursion */
+  if (recursion_depth > 5)
+    return;
+
+  /* test if the triangle is small enough.
+   *
+   * if yes, we compute the coefficient of the barycenter for the
+   * pixel (x,y) and see if a pixel is inside (ie the 3 coef have the
+   * same sign).
+   */
+  if (xmax - xmin == 1 && ymax - ymin == 1)
+    {
+      gdouble a, b, c, denom, x, y;
+
+      x = (gdouble) xmin + 0.5;
+      y = (gdouble) ymin + 0.5;
+
+      denom = (p2_d.x - p1_d.x) * p3_d.y + (p1_d.x - p3_d.x) * p2_d.y + (p3_d.x - p2_d.x) * p1_d.y;
+      a = ((p2_d.x - x) * p3_d.y + (x - p3_d.x) * p2_d.y + (p3_d.x - p2_d.x) * y) / denom;
+      b = - ((p1_d.x - x) * p3_d.y + (x - p3_d.x) * p1_d.y + (p3_d.x - p1_d.x) * y) / denom;
+      c = 1.0 - a - b;
+
+      /* if a pixel is inside, we compute its source coordinate and
+       * set it in the output buffer
+       */
+      if ((a > 0 && b > 0 && c > 0) || (a < 0 && b < 0 && c < 0))
+        {
+          GeglRectangle rect = { 0, 0, 1, 1 };
+          gfloat        coords[2];
+
+          rect.x = xmin;
+          rect.y = ymin;
+
+          coords[0] = (a * p1_s.x + b * p2_s.x + c * p3_s.x);
+          coords[1] = (a * p1_s.y + b * p2_s.y + c * p3_s.y);
+
+          gegl_buffer_set (out_buf,
+                           &rect,
+                           0,
+                           oct->format_coords,
+                           coords,
+                           GEGL_AUTO_ROWSTRIDE);
+        }
+
+      return;
+    }
+  else
+    {
+      /* we cut the triangle in 4 sub-triangle and treat it recursively */
+      /*
+       *       /\
+       *      /__\
+       *     /\  /\
+       *    /__\/__\
+       *
+       */
+
+      GimpVector2 pm1_d, pm2_d, pm3_d;
+      GimpVector2 pm1_s, pm2_s, pm3_s;
+      gint        next_depth = recursion_depth + 1;
+
+      pm1_d.x = (p1_d.x + p2_d.x) / 2.0;
+      pm1_d.y = (p1_d.y + p2_d.y) / 2.0;
+
+      pm2_d.x = (p2_d.x + p3_d.x) / 2.0;
+      pm2_d.y = (p2_d.y + p3_d.y) / 2.0;
+
+      pm3_d.x = (p3_d.x + p1_d.x) / 2.0;
+      pm3_d.y = (p3_d.y + p1_d.y) / 2.0;
+
+      pm1_s.x = (p1_s.x + p2_s.x) / 2.0;
+      pm1_s.y = (p1_s.y + p2_s.y) / 2.0;
+
+      pm2_s.x = (p2_s.x + p3_s.x) / 2.0;
+      pm2_s.y = (p2_s.y + p3_s.y) / 2.0;
+
+      pm3_s.x = (p3_s.x + p1_s.x) / 2.0;
+      pm3_s.y = (p3_s.y + p1_s.y) / 2.0;
+
+      gimp_operation_cage_transform_interpolate_source_coords_recurs (oct,
+                                                                      out_buf,
+                                                                      roi,
+                                                                      p1_s, p1_d,
+                                                                      pm1_s, pm1_d,
+                                                                      pm3_s, pm3_d,
+                                                                      next_depth,
+                                                                      coords);
+
+      gimp_operation_cage_transform_interpolate_source_coords_recurs (oct,
+                                                                      out_buf,
+                                                                      roi,
+                                                                      pm1_s, pm1_d,
+                                                                      p2_s, p2_d,
+                                                                      pm2_s, pm2_d,
+                                                                      next_depth,
+                                                                      coords);
+
+      gimp_operation_cage_transform_interpolate_source_coords_recurs (oct,
+                                                                      out_buf,
+                                                                      roi,
+                                                                      pm1_s, pm1_d,
+                                                                      pm2_s, pm2_d,
+                                                                      pm3_s, pm3_d,
+                                                                      next_depth,
+                                                                      coords);
+
+      gimp_operation_cage_transform_interpolate_source_coords_recurs (oct,
+                                                                      out_buf,
+                                                                      roi,
+                                                                      pm3_s, pm3_d,
+                                                                      pm2_s, pm2_d,
+                                                                      p3_s, p3_d,
+                                                                      next_depth,
+                                                                      coords);
+    }
+}
+
+static GimpVector2
+gimp_cage_transform_compute_destination (GimpCageConfig *config,
+                                         gfloat         *coef,
+                                         GeglSampler    *coef_sampler,
+                                         GimpVector2     coords)
+{
+  GimpVector2    result = {0, 0};
+  gint           n_cage_vertices = gimp_cage_config_get_n_points (config);
+  gint           i;
+  GimpCagePoint *point;
+
+  gegl_sampler_get (coef_sampler,
+                    coords.x, coords.y, NULL, coef, GEGL_ABYSS_NONE);
+
+  for (i = 0; i < n_cage_vertices; i++)
+    {
+      point = &g_array_index (config->cage_points, GimpCagePoint, i);
+
+      result.x += coef[i] * point->dest_point.x;
+      result.y += coef[i] * point->dest_point.y;
+
+      result.x += coef[i + n_cage_vertices] * point->edge_scaling_factor * point->edge_normal.x;
+      result.y += coef[i + n_cage_vertices] * point->edge_scaling_factor * point->edge_normal.y;
+    }
+
+  return result;
+}
+
+GeglRectangle
+gimp_operation_cage_transform_get_cached_region (GeglOperation       *operation,
+                                                 const GeglRectangle *roi)
+{
+  GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
+                                                                  "input");
+
+  return result;
+}
+
+GeglRectangle
+gimp_operation_cage_transform_get_required_for_output (GeglOperation       *operation,
+                                                       const gchar         *input_pad,
+                                                       const GeglRectangle *roi)
+{
+  GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
+                                                                  "input");
+
+  return result;
+}
+
+GeglRectangle
+gimp_operation_cage_transform_get_bounding_box (GeglOperation *operation)
+{
+  GeglRectangle result = *gegl_operation_source_get_bounding_box (operation,
+                                                                  "input");
+
+  return result;
+}
diff --git a/app/operations/gimpoperationcagetransform.h b/app/operations/gimpoperationcagetransform.h
new file mode 100644
index 0000000..8ee9286
--- /dev/null
+++ b/app/operations/gimpoperationcagetransform.h
@@ -0,0 +1,58 @@
+/* GIMP - The GNU Image Manipulation Program
+ *
+ * gimpoperationcagetransform.h
+ * Copyright (C) 2010 Michael Muré <batolettre@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_CAGE_TRANSFORM_H__
+#define __GIMP_OPERATION_CAGE_TRANSFORM_H__
+
+
+#include <gegl-plugin.h>
+#include <operation/gegl-operation-composer.h>
+
+
+#define GIMP_TYPE_OPERATION_CAGE_TRANSFORM            (gimp_operation_cage_transform_get_type ())
+#define GIMP_OPERATION_CAGE_TRANSFORM(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_CAGE_TRANSFORM, GimpOperationCageTransform))
+#define GIMP_OPERATION_CAGE_TRANSFORM_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_CAGE_TRANSFORM, GimpOperationCageTransformClass))
+#define GIMP_IS_OPERATION_CAGE_TRANSFORM(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_CAGE_TRANSFORM))
+#define GIMP_IS_OPERATION_CAGE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_CAGE_TRANSFORM))
+#define GIMP_OPERATION_CAGE_TRANSFORM_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_CAGE_TRANSFORM, GimpOperationCageTransformClass))
+
+
+typedef struct _GimpOperationCageTransform      GimpOperationCageTransform;
+typedef struct _GimpOperationCageTransformClass GimpOperationCageTransformClass;
+
+struct _GimpOperationCageTransform
+{
+  GeglOperationComposer  parent_instance;
+
+  GimpCageConfig        *config;
+  gboolean               fill_plain_color;
+
+  const Babl            *format_coords;
+};
+
+struct _GimpOperationCageTransformClass
+{
+  GeglOperationComposerClass  parent_class;
+};
+
+
+GType   gimp_operation_cage_transform_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_CAGE_TRANSFORM_H__ */
diff --git a/app/operations/gimpoperationcolorbalance.c b/app/operations/gimpoperationcolorbalance.c
new file mode 100644
index 0000000..9988158
--- /dev/null
+++ b/app/operations/gimpoperationcolorbalance.c
@@ -0,0 +1,198 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcolorbalance.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpcolorbalanceconfig.h"
+#include "gimpoperationcolorbalance.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_color_balance_process (GeglOperation       *operation,
+                                                      void                *in_buf,
+                                                      void                *out_buf,
+                                                      glong                samples,
+                                                      const GeglRectangle *roi,
+                                                      gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationColorBalance, gimp_operation_color_balance,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_color_balance_parent_class
+
+
+static void
+gimp_operation_color_balance_class_init (GimpOperationColorBalanceClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_point_filter_set_property;
+  object_class->get_property   = gimp_operation_point_filter_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:color-balance",
+                                 "categories",  "color",
+                                 "description", _("Adjust color distribution"),
+                                 NULL);
+
+  point_class->process = gimp_operation_color_balance_process;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "The config object",
+                                                        GIMP_TYPE_COLOR_BALANCE_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_color_balance_init (GimpOperationColorBalance *self)
+{
+}
+
+static inline gfloat
+gimp_operation_color_balance_map (gfloat  value,
+                                  gdouble lightness,
+                                  gdouble shadows,
+                                  gdouble midtones,
+                                  gdouble highlights)
+{
+  /* Apply masks to the corrections for shadows, midtones and
+   * highlights so that each correction affects only one range.
+   * Those masks look like this:
+   *     ‾\___
+   *     _/‾\_
+   *     ___/‾
+   * with ramps of width a at x = b and x = 1 - b.
+   *
+   * The sum of these masks equals 1 for x in 0..1, so applying the
+   * same correction in the shadows and in the midtones is equivalent
+   * to applying this correction on a virtual shadows_and_midtones
+   * range.
+   */
+  static const gdouble a = 0.25, b = 0.333, scale = 0.7;
+
+  shadows    *= CLAMP ((lightness - b) / -a + 0.5, 0, 1) * scale;
+  midtones   *= CLAMP ((lightness - b) /  a + 0.5, 0, 1) *
+                CLAMP ((lightness + b - 1) / -a + 0.5, 0, 1) * scale;
+  highlights *= CLAMP ((lightness + b - 1) /  a + 0.5, 0, 1) * scale;
+
+  value += shadows;
+  value += midtones;
+  value += highlights;
+  value = CLAMP (value, 0.0, 1.0);
+
+  return value;
+}
+
+static gboolean
+gimp_operation_color_balance_process (GeglOperation       *operation,
+                                      void                *in_buf,
+                                      void                *out_buf,
+                                      glong                samples,
+                                      const GeglRectangle *roi,
+                                      gint                 level)
+{
+  GimpOperationPointFilter *point  = GIMP_OPERATION_POINT_FILTER (operation);
+  GimpColorBalanceConfig   *config = GIMP_COLOR_BALANCE_CONFIG (point->config);
+  gfloat                   *src    = in_buf;
+  gfloat                   *dest   = out_buf;
+
+  if (! config)
+    return FALSE;
+
+  while (samples--)
+    {
+      gfloat r = src[RED];
+      gfloat g = src[GREEN];
+      gfloat b = src[BLUE];
+      gfloat r_n;
+      gfloat g_n;
+      gfloat b_n;
+
+      GimpRGB rgb = { r, g, b};
+      GimpHSL hsl;
+
+      gimp_rgb_to_hsl (&rgb, &hsl);
+
+      r_n = gimp_operation_color_balance_map (r, hsl.l,
+                                              config->cyan_red[GIMP_TRANSFER_SHADOWS],
+                                              config->cyan_red[GIMP_TRANSFER_MIDTONES],
+                                              config->cyan_red[GIMP_TRANSFER_HIGHLIGHTS]);
+
+      g_n = gimp_operation_color_balance_map (g, hsl.l,
+                                              config->magenta_green[GIMP_TRANSFER_SHADOWS],
+                                              config->magenta_green[GIMP_TRANSFER_MIDTONES],
+                                              config->magenta_green[GIMP_TRANSFER_HIGHLIGHTS]);
+
+      b_n = gimp_operation_color_balance_map (b, hsl.l,
+                                              config->yellow_blue[GIMP_TRANSFER_SHADOWS],
+                                              config->yellow_blue[GIMP_TRANSFER_MIDTONES],
+                                              config->yellow_blue[GIMP_TRANSFER_HIGHLIGHTS]);
+
+      if (config->preserve_luminosity)
+        {
+          GimpHSL hsl2;
+
+          rgb.r = r_n;
+          rgb.g = g_n;
+          rgb.b = b_n;
+          gimp_rgb_to_hsl (&rgb, &hsl);
+
+          rgb.r = r;
+          rgb.g = g;
+          rgb.b = b;
+          gimp_rgb_to_hsl (&rgb, &hsl2);
+
+          hsl.l = hsl2.l;
+
+          gimp_hsl_to_rgb (&hsl, &rgb);
+
+          r_n = rgb.r;
+          g_n = rgb.g;
+          b_n = rgb.b;
+        }
+
+      dest[RED]   = r_n;
+      dest[GREEN] = g_n;
+      dest[BLUE]  = b_n;
+      dest[ALPHA] = src[ALPHA];
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationcolorbalance.h b/app/operations/gimpoperationcolorbalance.h
new file mode 100644
index 0000000..a6ba386
--- /dev/null
+++ b/app/operations/gimpoperationcolorbalance.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcolorbalance.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_COLOR_BALANCE_H__
+#define __GIMP_OPERATION_COLOR_BALANCE_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_COLOR_BALANCE            (gimp_operation_color_balance_get_type ())
+#define GIMP_OPERATION_COLOR_BALANCE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_COLOR_BALANCE, GimpOperationColorBalance))
+#define GIMP_OPERATION_COLOR_BALANCE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_COLOR_BALANCE, GimpOperationColorBalanceClass))
+#define GIMP_IS_OPERATION_COLOR_BALANCE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_COLOR_BALANCE))
+#define GIMP_IS_OPERATION_COLOR_BALANCE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_COLOR_BALANCE))
+#define GIMP_OPERATION_COLOR_BALANCE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_COLOR_BALANCE, GimpOperationColorBalanceClass))
+
+
+typedef struct _GimpOperationColorBalance      GimpOperationColorBalance;
+typedef struct _GimpOperationColorBalanceClass GimpOperationColorBalanceClass;
+
+struct _GimpOperationColorBalance
+{
+  GimpOperationPointFilter  parent_instance;
+};
+
+struct _GimpOperationColorBalanceClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_color_balance_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_COLOR_BALANCE_H__ */
diff --git a/app/operations/gimpoperationcolorize.c b/app/operations/gimpoperationcolorize.c
new file mode 100644
index 0000000..fd64840
--- /dev/null
+++ b/app/operations/gimpoperationcolorize.c
@@ -0,0 +1,274 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcolorize.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationcolorize.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_HUE,
+  PROP_SATURATION,
+  PROP_LIGHTNESS,
+  PROP_COLOR
+};
+
+
+static void     gimp_operation_colorize_get_property (GObject      *object,
+                                                      guint         property_id,
+                                                      GValue       *value,
+                                                      GParamSpec   *pspec);
+static void     gimp_operation_colorize_set_property (GObject      *object,
+                                                      guint         property_id,
+                                                      const GValue *value,
+                                                      GParamSpec   *pspec);
+
+static gboolean gimp_operation_colorize_process (GeglOperation       *operation,
+                                                 void                *in_buf,
+                                                 void                *out_buf,
+                                                 glong                samples,
+                                                 const GeglRectangle *roi,
+                                                 gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationColorize, gimp_operation_colorize,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_colorize_parent_class
+
+
+static void
+gimp_operation_colorize_class_init (GimpOperationColorizeClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+  GimpHSL                        hsl;
+  GimpRGB                        rgb;
+
+  object_class->set_property   = gimp_operation_colorize_set_property;
+  object_class->get_property   = gimp_operation_colorize_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:colorize",
+                                 "categories",  "color",
+                                 "description", _("Colorize the image"),
+                                 NULL);
+
+  point_class->process = gimp_operation_colorize_process;
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HUE,
+                           "hue",
+                           _("Hue"),
+                           _("Hue"),
+                           0.0, 1.0, 0.5, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_SATURATION,
+                           "saturation",
+                           _("Saturation"),
+                           _("Saturation"),
+                           0.0, 1.0, 0.5, 0);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LIGHTNESS,
+                           "lightness",
+                           _("Lightness"),
+                           _("Lightness"),
+                           -1.0, 1.0, 0.0, 0);
+
+  gimp_hsl_set (&hsl, 0.5, 0.5, 0.5);
+  gimp_hsl_set_alpha (&hsl, 1.0);
+  gimp_hsl_to_rgb (&hsl, &rgb);
+
+  g_object_class_install_property (object_class, PROP_COLOR,
+                                   gimp_param_spec_rgb ("color",
+                                                        _("Color"),
+                                                        _("Color"),
+                                                        FALSE, &rgb,
+                                                        G_PARAM_READWRITE));
+}
+
+static void
+gimp_operation_colorize_init (GimpOperationColorize *self)
+{
+}
+
+static void
+gimp_operation_colorize_get_property (GObject    *object,
+                                      guint       property_id,
+                                      GValue     *value,
+                                      GParamSpec *pspec)
+{
+  GimpOperationColorize *self = GIMP_OPERATION_COLORIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_HUE:
+      g_value_set_double (value, self->hue);
+      break;
+
+    case PROP_SATURATION:
+      g_value_set_double (value, self->saturation);
+      break;
+
+    case PROP_LIGHTNESS:
+      g_value_set_double (value, self->lightness);
+      break;
+
+    case PROP_COLOR:
+      {
+        GimpHSL hsl;
+        GimpRGB rgb;
+
+        gimp_hsl_set (&hsl,
+                      self->hue,
+                      self->saturation,
+                      (self->lightness + 1.0) / 2.0);
+        gimp_hsl_set_alpha (&hsl, 1.0);
+        gimp_hsl_to_rgb (&hsl, &rgb);
+        gimp_value_set_rgb (value, &rgb);
+      }
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_colorize_set_property (GObject      *object,
+                                      guint         property_id,
+                                      const GValue *value,
+                                      GParamSpec   *pspec)
+{
+  GimpOperationColorize *self = GIMP_OPERATION_COLORIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_HUE:
+      self->hue = g_value_get_double (value);
+      g_object_notify (object, "color");
+      break;
+
+    case PROP_SATURATION:
+      self->saturation = g_value_get_double (value);
+      g_object_notify (object, "color");
+      break;
+
+    case PROP_LIGHTNESS:
+      self->lightness = g_value_get_double (value);
+      g_object_notify (object, "color");
+      break;
+
+    case PROP_COLOR:
+      {
+        GimpRGB rgb;
+        GimpHSL hsl;
+
+        gimp_value_get_rgb (value, &rgb);
+        gimp_rgb_to_hsl (&rgb, &hsl);
+
+        if (hsl.h == -1)
+          hsl.h = self->hue;
+
+        if (hsl.l == 0.0 || hsl.l == 1.0)
+          hsl.s = self->saturation;
+
+        g_object_set (self,
+                      "hue",        hsl.h,
+                      "saturation", hsl.s,
+                      "lightness",  hsl.l * 2.0 - 1.0,
+                      NULL);
+      }
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_operation_colorize_process (GeglOperation       *operation,
+                                 void                *in_buf,
+                                 void                *out_buf,
+                                 glong                samples,
+                                 const GeglRectangle *roi,
+                                 gint                 level)
+{
+  GimpOperationColorize *colorize  = GIMP_OPERATION_COLORIZE (operation);
+  gfloat                *src    = in_buf;
+  gfloat                *dest   = out_buf;
+  GimpHSL                hsl;
+
+  hsl.h = colorize->hue;
+  hsl.s = colorize->saturation;
+
+  while (samples--)
+    {
+      GimpRGB rgb;
+      gfloat  lum = GIMP_RGB_LUMINANCE (src[RED],
+                                        src[GREEN],
+                                        src[BLUE]);
+
+      if (colorize->lightness > 0)
+        {
+          lum = lum * (1.0 - colorize->lightness);
+
+          lum += 1.0 - (1.0 - colorize->lightness);
+        }
+      else if (colorize->lightness < 0)
+        {
+          lum = lum * (colorize->lightness + 1.0);
+        }
+
+      hsl.l = lum;
+
+      gimp_hsl_to_rgb (&hsl, &rgb);
+
+      /*  the code in base/colorize.c would multiply r,b,g with lum,
+       *  but this is a bug since it should multiply with 255. We
+       *  don't repeat this bug here (this is the reason why the gegl
+       *  colorize is brighter than the legacy one).
+       */
+      dest[RED]   = rgb.r; /* * lum */
+      dest[GREEN] = rgb.g; /* * lum */
+      dest[BLUE]  = rgb.b; /* * lum */
+      dest[ALPHA] = src[ALPHA];
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationcolorize.h b/app/operations/gimpoperationcolorize.h
new file mode 100644
index 0000000..cfb5545
--- /dev/null
+++ b/app/operations/gimpoperationcolorize.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcolorize.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_COLORIZE_H__
+#define __GIMP_OPERATION_COLORIZE_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_COLORIZE            (gimp_operation_colorize_get_type ())
+#define GIMP_OPERATION_COLORIZE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_COLORIZE, GimpOperationColorize))
+#define GIMP_OPERATION_COLORIZE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_COLORIZE, GimpOperationColorizeClass))
+#define GIMP_IS_OPERATION_COLORIZE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_COLORIZE))
+#define GIMP_IS_OPERATION_COLORIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_COLORIZE))
+#define GIMP_OPERATION_COLORIZE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_COLORIZE, GimpOperationColorizeClass))
+
+
+typedef struct _GimpOperationColorize      GimpOperationColorize;
+typedef struct _GimpOperationColorizeClass GimpOperationColorizeClass;
+
+struct _GimpOperationColorize
+{
+  GimpOperationPointFilter  parent_instance;
+
+  gdouble                   hue;
+  gdouble                   saturation;
+  gdouble                   lightness;
+};
+
+struct _GimpOperationColorizeClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_colorize_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_COLORIZE_H__ */
diff --git a/app/operations/gimpoperationcomposecrop.c b/app/operations/gimpoperationcomposecrop.c
new file mode 100644
index 0000000..25e6247
--- /dev/null
+++ b/app/operations/gimpoperationcomposecrop.c
@@ -0,0 +1,329 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcomposecrop.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ * Copyright (C) 2016 Massimo Valentini <mvalentini@src.gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "operations-types.h"
+
+#include "gimpoperationcomposecrop.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_X,
+  PROP_Y,
+  PROP_WIDTH,
+  PROP_HEIGHT
+};
+
+
+static void            gimp_operation_compose_crop_get_property            (GObject              *object,
+                                                                            guint                 property_id,
+                                                                            GValue               *value,
+                                                                            GParamSpec           *pspec);
+static void            gimp_operation_compose_crop_set_property            (GObject              *object,
+                                                                            guint                 property_id,
+                                                                            const GValue         *value,
+                                                                            GParamSpec           *pspec);
+
+static void            gimp_operation_compose_crop_prepare                 (GeglOperation        *operation);
+static GeglRectangle   gimp_operation_compose_crop_get_required_for_output (GeglOperation        *operation,
+                                                                            const gchar          *input_pad,
+                                                                            const GeglRectangle  *output_roi);
+static gboolean        gimp_operation_compose_crop_parent_process          (GeglOperation        *operation,
+                                                                            GeglOperationContext *context,
+                                                                            const gchar          *output_pad,
+                                                                            const GeglRectangle  *roi,
+                                                                            gint                  level);
+
+static gboolean        gimp_operation_compose_crop_process                 (GeglOperation        *operation,
+                                                                            void                 *in_buf,
+                                                                            void                 *aux_buf,
+                                                                            void                 *out_buf,
+                                                                            glong                 samples,
+                                                                            const GeglRectangle  *roi,
+                                                                            gint                  level);
+
+
+G_DEFINE_TYPE (GimpOperationComposeCrop, gimp_operation_compose_crop,
+               GEGL_TYPE_OPERATION_POINT_COMPOSER)
+
+#define parent_class gimp_operation_compose_crop_parent_class
+
+
+static void
+gimp_operation_compose_crop_class_init (GimpOperationComposeCropClass *klass)
+{
+  GObjectClass                    *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass              *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointComposerClass *point_class     = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_compose_crop_set_property;
+  object_class->get_property = gimp_operation_compose_crop_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:compose-crop",
+                                 "categories",  "gimp",
+                                 "description", "Selectively pick components from src or aux",
+                                 NULL);
+
+  operation_class->prepare                   = gimp_operation_compose_crop_prepare;
+  operation_class->get_invalidated_by_change = gimp_operation_compose_crop_get_required_for_output;
+  operation_class->get_required_for_output   = gimp_operation_compose_crop_get_required_for_output;
+  operation_class->process                   = gimp_operation_compose_crop_parent_process;
+
+  point_class->process                       = gimp_operation_compose_crop_process;
+
+  g_object_class_install_property (object_class, PROP_X,
+                                   g_param_spec_int ("x",
+                                                     "x",
+                                                     "x",
+                                                     G_MININT, G_MAXINT, 0,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+  g_object_class_install_property (object_class, PROP_Y,
+                                   g_param_spec_int ("y",
+                                                     "y",
+                                                     "y",
+                                                     G_MININT, G_MAXINT, 0,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+  g_object_class_install_property (object_class, PROP_WIDTH,
+                                   g_param_spec_int ("width",
+                                                     "width",
+                                                     "width",
+                                                     0, G_MAXINT, 0,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+  g_object_class_install_property (object_class, PROP_HEIGHT,
+                                   g_param_spec_int ("height",
+                                                     "height",
+                                                     "height",
+                                                     0, G_MAXINT, 0,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_compose_crop_init (GimpOperationComposeCrop *self)
+{
+}
+
+static void
+gimp_operation_compose_crop_get_property (GObject    *object,
+                                          guint       property_id,
+                                          GValue     *value,
+                                          GParamSpec *pspec)
+{
+  GimpOperationComposeCrop *self = GIMP_OPERATION_COMPOSE_CROP (object);
+
+  switch (property_id)
+    {
+    case PROP_X:
+      g_value_set_int (value, self->rect.x);
+      break;
+    case PROP_Y:
+      g_value_set_int (value, self->rect.y);
+      break;
+    case PROP_WIDTH:
+      g_value_set_int (value, self->rect.width);
+      break;
+    case PROP_HEIGHT:
+      g_value_set_int (value, self->rect.height);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_compose_crop_set_property (GObject      *object,
+                                          guint         property_id,
+                                          const GValue *value,
+                                          GParamSpec   *pspec)
+{
+  GimpOperationComposeCrop *self = GIMP_OPERATION_COMPOSE_CROP (object);
+
+  switch (property_id)
+    {
+    case PROP_X:
+      self->rect.x = g_value_get_int (value);
+      break;
+    case PROP_Y:
+      self->rect.y = g_value_get_int (value);
+      break;
+    case PROP_WIDTH:
+      self->rect.width = g_value_get_int (value);
+      break;
+    case PROP_HEIGHT:
+      self->rect.height = g_value_get_int (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_compose_crop_prepare (GeglOperation *operation)
+{
+  const Babl *input_format  = gegl_operation_get_source_format (operation, "input");
+  const Babl *aux_format    = gegl_operation_get_source_format (operation, "aux");
+  const Babl *format;
+
+  if (input_format)
+    {
+      if (input_format == aux_format)
+        {
+          format = input_format;
+        }
+      else
+        {
+          const Babl *model = babl_format_get_model (input_format);
+
+          if (model == babl_model ("R'G'B'A"))
+            format = babl_format_with_space ("R'G'B'A float", input_format);
+          else
+            format = babl_format_with_space ("RGBA float", input_format);
+        }
+    }
+  else
+    {
+      format = babl_format_with_space ("RGBA float", input_format);
+    }
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "aux",    format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static GeglRectangle
+gimp_operation_compose_crop_get_required_for_output (GeglOperation       *operation,
+                                                     const gchar         *input_pad,
+                                                     const GeglRectangle *output_roi)
+{
+  GimpOperationComposeCrop *self = GIMP_OPERATION_COMPOSE_CROP (operation);
+  GeglRectangle             result;
+
+  if (! strcmp (input_pad, "input"))
+    gegl_rectangle_intersect (&result, output_roi, &self->rect);
+  else if (! strcmp (input_pad, "aux"))
+    gegl_rectangle_subtract_bounding_box (&result, output_roi, &self->rect);
+  else
+    g_return_val_if_reached (*output_roi);
+
+  return result;
+}
+
+static gboolean
+gimp_operation_compose_crop_parent_process (GeglOperation        *operation,
+                                            GeglOperationContext *context,
+                                            const gchar          *output_pad,
+                                            const GeglRectangle  *roi,
+                                            gint                  level)
+{
+  GimpOperationComposeCrop *self = GIMP_OPERATION_COMPOSE_CROP (operation);
+
+  if (gegl_rectangle_contains (&self->rect, roi))
+    {
+      GObject *input;
+
+      input = gegl_operation_context_get_object (context, "input");
+      gegl_operation_context_set_object (context, "output", input);
+
+      return TRUE;
+    }
+  else if (! gegl_rectangle_intersect (NULL, &self->rect, roi))
+    {
+      GObject *aux;
+
+      aux = gegl_operation_context_get_object (context, "aux");
+      gegl_operation_context_set_object (context, "output", aux);
+
+      return TRUE;
+    }
+
+  return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
+                                                       output_pad, roi, level);
+}
+
+static gboolean
+gimp_operation_compose_crop_process (GeglOperation       *operation,
+                                     void                *in_buf,
+                                     void                *aux_buf,
+                                     void                *out_buf,
+                                     glong                samples,
+                                     const GeglRectangle *roi,
+                                     gint                 level)
+{
+  GimpOperationComposeCrop *self   = GIMP_OPERATION_COMPOSE_CROP (operation);
+  const Babl               *format = gegl_operation_get_format (operation, "output");
+  gint                      bpp    = babl_format_get_bytes_per_pixel (format);
+  const guchar             *in     = in_buf;
+  const guchar             *aux    = aux_buf;
+  guchar                   *out    = out_buf;
+  gint                      x0, x1;
+  gint                      y0, y1;
+  gint                      y;
+
+#define COPY(src, n)                                                           \
+  do                                                                           \
+    {                                                                          \
+      gint size = (n) * bpp;                                                   \
+                                                                               \
+      if (src)                                                                 \
+        memcpy (out, (src), size);                                             \
+      else                                                                     \
+        memset (out, 0, size);                                                 \
+                                                                               \
+      in           += size;                                                    \
+      if (aux) aux += size;                                                    \
+      out          += size;                                                    \
+    }                                                                          \
+  while (FALSE)
+
+  x0 = CLAMP (self->rect.x,                     roi->x, roi->x + roi->width);
+  x1 = CLAMP (self->rect.x + self->rect.width,  roi->x, roi->x + roi->width);
+
+  y0 = CLAMP (self->rect.y,                     roi->y, roi->y + roi->height);
+  y1 = CLAMP (self->rect.y + self->rect.height, roi->y, roi->y + roi->height);
+
+  COPY (aux, (y0 - roi->y) * roi->width);
+
+  for (y = y0; y < y1; y++)
+    {
+      COPY (aux, x0 - roi->x);
+      COPY (in,  x1 - x0);
+      COPY (aux, roi->x + roi->width - x1);
+    }
+
+  COPY (aux, (roi->y + roi->height - y1) * roi->width);
+
+#undef COPY
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationcomposecrop.h b/app/operations/gimpoperationcomposecrop.h
new file mode 100644
index 0000000..83b7613
--- /dev/null
+++ b/app/operations/gimpoperationcomposecrop.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcomposecrop.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ * Copyright (C) 2016 Massimo Valentini <mvalentini@src.gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_COMPOSE_CROP_H__
+#define __GIMP_OPERATION_COMPOSE_CROP_H__
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_COMPOSE_CROP            (gimp_operation_compose_crop_get_type ())
+#define GIMP_OPERATION_COMPOSE_CROP(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_COMPOSE_CROP, GimpOperationComposeCrop))
+#define GIMP_OPERATION_COMPOSE_CROP_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_COMPOSE_CROP, GimpOperationComposeCropClass))
+#define GIMP_IS_OPERATION_COMPOSE_CROP(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_COMPOSE_CROP))
+#define GIMP_IS_OPERATION_COMPOSE_CROP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_COMPOSE_CROP))
+#define GIMP_OPERATION_COMPOSE_CROP_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_COMPOSE_CROP, GimpOperationComposeCropClass))
+
+
+typedef struct _GimpOperationComposeCrop      GimpOperationComposeCrop;
+typedef struct _GimpOperationComposeCropClass GimpOperationComposeCropClass;
+
+struct _GimpOperationComposeCrop
+{
+  GeglOperationPointComposer  parent_instance;
+
+  GeglRectangle               rect;
+};
+
+struct _GimpOperationComposeCropClass
+{
+  GeglOperationPointComposerClass  parent_class;
+};
+
+
+GType   gimp_operation_compose_crop_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_COMPOSE_CROP_H__ */
diff --git a/app/operations/gimpoperationcurves.c b/app/operations/gimpoperationcurves.c
new file mode 100644
index 0000000..e83b142
--- /dev/null
+++ b/app/operations/gimpoperationcurves.c
@@ -0,0 +1,118 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcurves.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "core/gimpcurve.h"
+#include "core/gimpcurve-map.h"
+
+#include "gimpcurvesconfig.h"
+#include "gimpoperationcurves.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_curves_process (GeglOperation       *operation,
+                                               void                *in_buf,
+                                               void                *out_buf,
+                                               glong                samples,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationCurves, gimp_operation_curves,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_curves_parent_class
+
+
+static void
+gimp_operation_curves_class_init (GimpOperationCurvesClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_point_filter_set_property;
+  object_class->get_property   = gimp_operation_point_filter_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:curves",
+                                 "categories",  "color",
+                                 "description", _("Adjust color curves"),
+                                 NULL);
+
+  point_class->process = gimp_operation_curves_process;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_LINEAR,
+                                   g_param_spec_boolean ("linear",
+                                                         "Linear",
+                                                         "Whether to operate on linear RGB",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "The config object",
+                                                        GIMP_TYPE_CURVES_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_curves_init (GimpOperationCurves *self)
+{
+}
+
+static gboolean
+gimp_operation_curves_process (GeglOperation       *operation,
+                               void                *in_buf,
+                               void                *out_buf,
+                               glong                samples,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  GimpOperationPointFilter *point  = GIMP_OPERATION_POINT_FILTER (operation);
+  GimpCurvesConfig         *config = GIMP_CURVES_CONFIG (point->config);
+  gfloat                   *src    = in_buf;
+  gfloat                   *dest   = out_buf;
+
+  if (! config)
+    return FALSE;
+
+  gimp_curve_map_pixels (config->curve[0],
+                         config->curve[1],
+                         config->curve[2],
+                         config->curve[3],
+                         config->curve[4], src, dest, samples);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationcurves.h b/app/operations/gimpoperationcurves.h
new file mode 100644
index 0000000..ab097b2
--- /dev/null
+++ b/app/operations/gimpoperationcurves.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcurves.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_CURVES_H__
+#define __GIMP_OPERATION_CURVES_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_CURVES            (gimp_operation_curves_get_type ())
+#define GIMP_OPERATION_CURVES(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_CURVES, GimpOperationCurves))
+#define GIMP_OPERATION_CURVES_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_CURVES, GimpOperationCurvesClass))
+#define GIMP_IS_OPERATION_CURVES(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_CURVES))
+#define GIMP_IS_OPERATION_CURVES_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_CURVES))
+#define GIMP_OPERATION_CURVES_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_CURVES, GimpOperationCurvesClass))
+
+
+typedef struct _GimpOperationCurves      GimpOperationCurves;
+typedef struct _GimpOperationCurvesClass GimpOperationCurvesClass;
+
+struct _GimpOperationCurves
+{
+  GimpOperationPointFilter  parent_instance;
+};
+
+struct _GimpOperationCurvesClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_curves_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_CURVES_H__ */
diff --git a/app/operations/gimpoperationdesaturate.c b/app/operations/gimpoperationdesaturate.c
new file mode 100644
index 0000000..9f833db
--- /dev/null
+++ b/app/operations/gimpoperationdesaturate.c
@@ -0,0 +1,257 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdesaturate.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationdesaturate.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_MODE
+};
+
+
+static void     gimp_operation_desaturate_get_property (GObject             *object,
+                                                        guint                property_id,
+                                                        GValue              *value,
+                                                        GParamSpec          *pspec);
+static void     gimp_operation_desaturate_set_property (GObject             *object,
+                                                        guint                property_id,
+                                                        const GValue        *value,
+                                                        GParamSpec          *pspec);
+
+static void     gimp_operation_desaturate_prepare      (GeglOperation       *operation);
+static gboolean gimp_operation_desaturate_process      (GeglOperation       *operation,
+                                                        void                *in_buf,
+                                                        void                *out_buf,
+                                                        glong                samples,
+                                                        const GeglRectangle *roi,
+                                                        gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationDesaturate, gimp_operation_desaturate,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_desaturate_parent_class
+
+
+static void
+gimp_operation_desaturate_class_init (GimpOperationDesaturateClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_desaturate_set_property;
+  object_class->get_property = gimp_operation_desaturate_get_property;
+
+  operation_class->prepare   = gimp_operation_desaturate_prepare;
+
+  point_class->process       = gimp_operation_desaturate_process;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:desaturate",
+                                 "categories",  "color",
+                                 "description", _("Turn colors into shades of gray"),
+                                 NULL);
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_MODE,
+                         "mode",
+                         _("Mode"),
+                         _("Choose shade of gray based on"),
+                         GIMP_TYPE_DESATURATE_MODE,
+                         GIMP_DESATURATE_LUMINANCE,
+                         GIMP_PARAM_STATIC_STRINGS);
+}
+
+static void
+gimp_operation_desaturate_init (GimpOperationDesaturate *self)
+{
+}
+
+static void
+gimp_operation_desaturate_get_property (GObject    *object,
+                                        guint       property_id,
+                                        GValue     *value,
+                                        GParamSpec *pspec)
+{
+  GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (object);
+
+  switch (property_id)
+    {
+    case PROP_MODE:
+      g_value_set_enum (value, desaturate->mode);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_desaturate_set_property (GObject      *object,
+                                        guint         property_id,
+                                        const GValue *value,
+                                        GParamSpec   *pspec)
+{
+  GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (object);
+
+  switch (property_id)
+    {
+    case PROP_MODE:
+      desaturate->mode = g_value_get_enum (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_desaturate_prepare (GeglOperation *operation)
+{
+  GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (operation);
+  const Babl              *format = gegl_operation_get_source_format (operation, "input");
+
+  if (desaturate->mode == GIMP_DESATURATE_LUMINANCE)
+    {
+      format = babl_format_with_space ("RGBA float", format);
+    }
+  else
+    {
+      format = babl_format_with_space ("R'G'B'A float", format);
+    }
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+gimp_operation_desaturate_process (GeglOperation       *operation,
+                                   void                *in_buf,
+                                   void                *out_buf,
+                                   glong                samples,
+                                   const GeglRectangle *roi,
+                                   gint                 level)
+{
+  GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (operation);
+  gfloat                  *src        = in_buf;
+  gfloat                  *dest       = out_buf;
+
+  switch (desaturate->mode)
+    {
+    case GIMP_DESATURATE_LIGHTNESS:
+      /* This is the formula for Lightness in the HSL "bi-hexcone"
+       * model: https://en.wikipedia.org/wiki/HSL_and_HSV
+       */
+      while (samples--)
+        {
+          gfloat min, max, value;
+
+          max = MAX (src[0], src[1]);
+          max = MAX (max, src[2]);
+          min = MIN (src[0], src[1]);
+          min = MIN (min, src[2]);
+
+          value = (max + min) / 2;
+
+          dest[0] = value;
+          dest[1] = value;
+          dest[2] = value;
+          dest[3] = src[3];
+
+          src  += 4;
+          dest += 4;
+        }
+      break;
+
+    case GIMP_DESATURATE_LUMA:
+    case GIMP_DESATURATE_LUMINANCE:
+      while (samples--)
+        {
+          gfloat value = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]);
+
+          dest[0] = value;
+          dest[1] = value;
+          dest[2] = value;
+          dest[3] = src[3];
+
+          src  += 4;
+          dest += 4;
+        }
+      break;
+
+    case GIMP_DESATURATE_AVERAGE:
+      /* This is the formula for Intensity in the HSI model:
+       * https://en.wikipedia.org/wiki/HSL_and_HSV
+       */
+      while (samples--)
+        {
+          gfloat value = (src[0] + src[1] + src[2]) / 3;
+
+          dest[0] = value;
+          dest[1] = value;
+          dest[2] = value;
+          dest[3] = src[3];
+
+          src  += 4;
+          dest += 4;
+        }
+      break;
+
+    case GIMP_DESATURATE_VALUE:
+      /* This is the formula for Value in the HSV model:
+       * https://en.wikipedia.org/wiki/HSL_and_HSV
+       */
+      while (samples--)
+        {
+          gfloat value;
+
+          value = MAX (src[0], src[1]);
+          value = MAX (value, src[2]);
+
+          dest[0] = value;
+          dest[1] = value;
+          dest[2] = value;
+          dest[3] = src[3];
+
+          src  += 4;
+          dest += 4;
+        }
+      break;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationdesaturate.h b/app/operations/gimpoperationdesaturate.h
new file mode 100644
index 0000000..3117a61
--- /dev/null
+++ b/app/operations/gimpoperationdesaturate.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdesaturate.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DESATURATE_H__
+#define __GIMP_OPERATION_DESATURATE_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_DESATURATE            (gimp_operation_desaturate_get_type ())
+#define GIMP_OPERATION_DESATURATE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_DESATURATE, GimpOperationDesaturate))
+#define GIMP_OPERATION_DESATURATE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_DESATURATE, GimpOperationDesaturateClass))
+#define GIMP_IS_OPERATION_DESATURATE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_DESATURATE))
+#define GIMP_IS_OPERATION_DESATURATE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DESATURATE))
+#define GIMP_OPERATION_DESATURATE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DESATURATE, GimpOperationDesaturateClass))
+
+
+typedef struct _GimpOperationDesaturate      GimpOperationDesaturate;
+typedef struct _GimpOperationDesaturateClass GimpOperationDesaturateClass;
+
+struct _GimpOperationDesaturate
+{
+  GimpOperationPointFilter  parent_instance;
+
+  GimpDesaturateMode        mode;
+};
+
+struct _GimpOperationDesaturateClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_desaturate_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_DESATURATE_H__ */
diff --git a/app/operations/gimpoperationequalize.c b/app/operations/gimpoperationequalize.c
new file mode 100644
index 0000000..119be23
--- /dev/null
+++ b/app/operations/gimpoperationequalize.c
@@ -0,0 +1,248 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationequalize.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "core/gimphistogram.h"
+
+#include "gimpoperationequalize.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_HISTOGRAM
+};
+
+
+static void     gimp_operation_equalize_finalize     (GObject             *object);
+static void     gimp_operation_equalize_get_property (GObject             *object,
+                                                      guint                property_id,
+                                                      GValue              *value,
+                                                      GParamSpec          *pspec);
+static void     gimp_operation_equalize_set_property (GObject             *object,
+                                                      guint                property_id,
+                                                      const GValue        *value,
+                                                      GParamSpec          *pspec);
+
+static gboolean gimp_operation_equalize_process      (GeglOperation       *operation,
+                                                      void                *in_buf,
+                                                      void                *out_buf,
+                                                      glong                samples,
+                                                      const GeglRectangle *roi,
+                                                      gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationEqualize, gimp_operation_equalize,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_equalize_parent_class
+
+
+static void
+gimp_operation_equalize_class_init (GimpOperationEqualizeClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->finalize       = gimp_operation_equalize_finalize;
+  object_class->set_property   = gimp_operation_equalize_set_property;
+  object_class->get_property   = gimp_operation_equalize_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:equalize",
+                                 "categories",  "color",
+                                 "description", "GIMP Equalize operation",
+                                 NULL);
+
+  point_class->process = gimp_operation_equalize_process;
+
+  g_object_class_install_property (object_class, PROP_HISTOGRAM,
+                                   g_param_spec_object ("histogram",
+                                                        "Histogram",
+                                                        "The histogram",
+                                                        GIMP_TYPE_HISTOGRAM,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gimp_operation_equalize_init (GimpOperationEqualize *self)
+{
+  self->values = NULL;
+  self->n_bins = 0;
+}
+
+static void
+gimp_operation_equalize_finalize (GObject *object)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (object);
+
+  g_clear_pointer (&self->values, g_free);
+  g_clear_object (&self->histogram);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_equalize_get_property (GObject    *object,
+                                      guint       property_id,
+                                      GValue     *value,
+                                      GParamSpec *pspec)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_HISTOGRAM:
+      g_value_set_pointer (value, self->histogram);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_equalize_set_property (GObject      *object,
+                                      guint         property_id,
+                                      const GValue *value,
+                                      GParamSpec   *pspec)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_HISTOGRAM:
+      if (self->histogram)
+        g_object_unref (self->histogram);
+
+      self->histogram = g_value_dup_object (value);
+
+      if (self->histogram)
+        {
+          gdouble pixels;
+          gint    n_bins;
+          gint    max;
+          gint    k;
+
+          n_bins = gimp_histogram_n_bins (self->histogram);
+
+          if ((self->values != NULL) && (self->n_bins != n_bins))
+            {
+              g_free (self->values);
+              self->values = NULL;
+            }
+
+          if (self->values == NULL)
+            {
+              self->values = g_new (gdouble, 3 * n_bins);
+            }
+
+          self->n_bins = n_bins;
+
+          pixels = gimp_histogram_get_count (self->histogram,
+                                             GIMP_HISTOGRAM_VALUE, 0, n_bins - 1);
+
+          if (gimp_histogram_n_components (self->histogram) == 1 ||
+              gimp_histogram_n_components (self->histogram) == 2)
+            max = 1;
+          else
+            max = 3;
+
+          for (k = 0; k < 3; k++)
+            {
+              gdouble sum = 0;
+              gint    i;
+
+             for (i = 0; i < n_bins; i++)
+                {
+                  gdouble histi;
+
+                  histi = gimp_histogram_get_component (self->histogram, k, i);
+
+                  sum += histi;
+
+                  self->values[k * n_bins + i] = sum / pixels;
+
+                  if (max == 1)
+                    {
+                      self->values[n_bins + i] = self->values[i];
+                      self->values[2 * n_bins + i] = self->values[i];
+                    }
+                }
+           }
+        }
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static inline float
+gimp_operation_equalize_map (GimpOperationEqualize *self,
+                             gint                   component,
+                             gfloat                 value)
+{
+  gint index;
+  index = component * self->n_bins + \
+            (gint) (CLAMP (value * (self->n_bins - 1), 0.0, self->n_bins - 1));
+
+  return self->values[index];
+}
+
+static gboolean
+gimp_operation_equalize_process (GeglOperation       *operation,
+                                 void                *in_buf,
+                                 void                *out_buf,
+                                 glong                samples,
+                                 const GeglRectangle *roi,
+                                 gint                 level)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (operation);
+  gfloat                *src  = in_buf;
+  gfloat                *dest = out_buf;
+
+  while (samples--)
+    {
+      dest[RED]   = gimp_operation_equalize_map (self, RED,   src[RED]);
+      dest[GREEN] = gimp_operation_equalize_map (self, GREEN, src[GREEN]);
+      dest[BLUE]  = gimp_operation_equalize_map (self, BLUE,  src[BLUE]);
+      dest[ALPHA] = src[ALPHA];
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationequalize.h b/app/operations/gimpoperationequalize.h
new file mode 100644
index 0000000..ea03b18
--- /dev/null
+++ b/app/operations/gimpoperationequalize.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationequalize.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_EQUALIZE_H__
+#define __GIMP_OPERATION_EQUALIZE_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_EQUALIZE            (gimp_operation_equalize_get_type ())
+#define GIMP_OPERATION_EQUALIZE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_EQUALIZE, GimpOperationEqualize))
+#define GIMP_OPERATION_EQUALIZE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_EQUALIZE, GimpOperationEqualizeClass))
+#define GIMP_IS_OPERATION_EQUALIZE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_EQUALIZE))
+#define GIMP_IS_OPERATION_EQUALIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_EQUALIZE))
+#define GIMP_OPERATION_EQUALIZE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_EQUALIZE, GimpOperationEqualizeClass))
+
+
+typedef struct _GimpOperationEqualize      GimpOperationEqualize;
+typedef struct _GimpOperationEqualizeClass GimpOperationEqualizeClass;
+
+struct _GimpOperationEqualize
+{
+  GimpOperationPointFilter  parent_instance;
+
+  GimpHistogram            *histogram;
+  gdouble                  *values;
+  gint                      n_bins;
+};
+
+struct _GimpOperationEqualizeClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_equalize_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_EQUALIZE_H__ */
diff --git a/app/operations/gimpoperationfillsource.c b/app/operations/gimpoperationfillsource.c
new file mode 100644
index 0000000..5811611
--- /dev/null
+++ b/app/operations/gimpoperationfillsource.c
@@ -0,0 +1,254 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationfillsource.c
+ * Copyright (C) 2019 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl-plugin.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "operations-types.h"
+
+#include "core/gimpdrawable.h"
+#include "core/gimpfilloptions.h"
+
+#include "gimpoperationfillsource.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_OPTIONS,
+  PROP_DRAWABLE,
+  PROP_PATTERN_OFFSET_X,
+  PROP_PATTERN_OFFSET_Y,
+};
+
+
+static void            gimp_operation_fill_source_dispose          (GObject              *object);
+static void            gimp_operation_fill_source_get_property     (GObject              *object,
+                                                                    guint                 property_id,
+                                                                    GValue               *value,
+                                                                    GParamSpec           *pspec);
+static void            gimp_operation_fill_source_set_property     (GObject              *object,
+                                                                    guint                 property_id,
+                                                                    const GValue         *value,
+                                                                    GParamSpec           *pspec);
+
+static GeglRectangle   gimp_operation_fill_source_get_bounding_box (GeglOperation        *operation);
+static void            gimp_operation_fill_source_prepare          (GeglOperation        *operation);
+static gboolean        gimp_operation_fill_source_process          (GeglOperation        *operation,
+                                                                    GeglOperationContext *context,
+                                                                    const gchar          *output_pad,
+                                                                    const GeglRectangle  *result,
+                                                                    gint                  level);
+
+
+G_DEFINE_TYPE (GimpOperationFillSource, gimp_operation_fill_source,
+               GEGL_TYPE_OPERATION_SOURCE)
+
+#define parent_class gimp_operation_fill_source_parent_class
+
+
+static void
+gimp_operation_fill_source_class_init (GimpOperationFillSourceClass *klass)
+{
+  GObjectClass       *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+
+  object_class->dispose             = gimp_operation_fill_source_dispose;
+  object_class->set_property        = gimp_operation_fill_source_set_property;
+  object_class->get_property        = gimp_operation_fill_source_get_property;
+
+  operation_class->get_bounding_box = gimp_operation_fill_source_get_bounding_box;
+  operation_class->prepare          = gimp_operation_fill_source_prepare;
+  operation_class->process          = gimp_operation_fill_source_process;
+
+  operation_class->threaded         = FALSE;
+  operation_class->cache_policy     = GEGL_CACHE_POLICY_NEVER;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:fill-source",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Fill Source operation",
+                                 NULL);
+
+  g_object_class_install_property (object_class, PROP_OPTIONS,
+                                   g_param_spec_object ("options",
+                                                        "Options",
+                                                        "Fill options",
+                                                        GIMP_TYPE_FILL_OPTIONS,
+                                                        G_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_DRAWABLE,
+                                   g_param_spec_object ("drawable",
+                                                        "Drawable",
+                                                        "Fill drawable",
+                                                        GIMP_TYPE_DRAWABLE,
+                                                        G_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_PATTERN_OFFSET_X,
+                                   g_param_spec_int  ("pattern-offset-x",
+                                                      "Pattern X-offset",
+                                                      "Pattern X-offset",
+                                                      G_MININT, G_MAXINT, 0,
+                                                      G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_PATTERN_OFFSET_Y,
+                                   g_param_spec_int  ("pattern-offset-y",
+                                                      "Pattern Y-offset",
+                                                      "Pattern Y-offset",
+                                                      G_MININT, G_MAXINT, 0,
+                                                      G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_fill_source_init (GimpOperationFillSource *self)
+{
+}
+
+static void
+gimp_operation_fill_source_dispose (GObject *object)
+{
+  GimpOperationFillSource *fill_source = GIMP_OPERATION_FILL_SOURCE (object);
+
+  g_clear_object (&fill_source->options);
+  g_clear_object (&fill_source->drawable);
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_fill_source_get_property (GObject    *object,
+                                         guint       property_id,
+                                         GValue     *value,
+                                         GParamSpec *pspec)
+{
+  GimpOperationFillSource *fill_source = GIMP_OPERATION_FILL_SOURCE (object);
+
+  switch (property_id)
+    {
+    case PROP_OPTIONS:
+      g_value_set_object (value, fill_source->options);
+      break;
+
+    case PROP_DRAWABLE:
+      g_value_set_object (value, fill_source->drawable);
+      break;
+
+    case PROP_PATTERN_OFFSET_X:
+      g_value_set_int (value, fill_source->pattern_offset_x);
+      break;
+
+    case PROP_PATTERN_OFFSET_Y:
+      g_value_set_int (value, fill_source->pattern_offset_y);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_fill_source_set_property (GObject      *object,
+                                         guint         property_id,
+                                         const GValue *value,
+                                         GParamSpec   *pspec)
+{
+  GimpOperationFillSource *fill_source = GIMP_OPERATION_FILL_SOURCE (object);
+
+  switch (property_id)
+    {
+    case PROP_OPTIONS:
+      g_set_object (&fill_source->options, g_value_get_object (value));
+      break;
+
+    case PROP_DRAWABLE:
+      g_set_object (&fill_source->drawable, g_value_get_object (value));
+      break;
+
+    case PROP_PATTERN_OFFSET_X:
+      fill_source->pattern_offset_x = g_value_get_int (value);
+      break;
+
+    case PROP_PATTERN_OFFSET_Y:
+      fill_source->pattern_offset_y = g_value_get_int (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static GeglRectangle
+gimp_operation_fill_source_get_bounding_box (GeglOperation *operation)
+{
+  return gegl_rectangle_infinite_plane ();
+}
+
+static void
+gimp_operation_fill_source_prepare (GeglOperation *operation)
+{
+  GimpOperationFillSource *fill_source = GIMP_OPERATION_FILL_SOURCE (operation);
+  const Babl              *format      = NULL;
+
+  if (fill_source->options && fill_source->drawable)
+    {
+      format = gimp_fill_options_get_format (fill_source->options,
+                                             fill_source->drawable);
+    }
+
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+gimp_operation_fill_source_process (GeglOperation        *operation,
+                                    GeglOperationContext *context,
+                                    const gchar          *output_pad,
+                                    const GeglRectangle  *result,
+                                    gint                  level)
+{
+  GimpOperationFillSource *fill_source = GIMP_OPERATION_FILL_SOURCE (operation);
+
+  if (fill_source->options && fill_source->drawable)
+    {
+      GeglBuffer    *buffer;
+      GeglRectangle  rect;
+
+      gegl_rectangle_align_to_buffer (
+        &rect, result,
+        gimp_drawable_get_buffer (fill_source->drawable),
+        GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
+
+      buffer = gimp_fill_options_create_buffer (fill_source->options,
+                                                fill_source->drawable,
+                                                &rect,
+                                                fill_source->pattern_offset_x,
+                                                fill_source->pattern_offset_y);
+
+      gegl_operation_context_take_object (context, "output", G_OBJECT (buffer));
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationfillsource.h b/app/operations/gimpoperationfillsource.h
new file mode 100644
index 0000000..6a9f468
--- /dev/null
+++ b/app/operations/gimpoperationfillsource.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationfillsource.h
+ * Copyright (C) 2019 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_FILL_SOURCE_H__
+#define __GIMP_OPERATION_FILL_SOURCE_H__
+
+
+#define GIMP_TYPE_OPERATION_FILL_SOURCE            (gimp_operation_fill_source_get_type ())
+#define GIMP_OPERATION_FILL_SOURCE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_FILL_SOURCE, GimpOperationFillSource))
+#define GIMP_OPERATION_FILL_SOURCE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_FILL_SOURCE, GimpOperationFillSourceClass))
+#define GIMP_IS_OPERATION_FILL_SOURCE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_FILL_SOURCE))
+#define GIMP_IS_OPERATION_FILL_SOURCE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_FILL_SOURCE))
+#define GIMP_OPERATION_FILL_SOURCE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_FILL_SOURCE, GimpOperationFillSourceClass))
+
+
+typedef struct _GimpOperationFillSource      GimpOperationFillSource;
+typedef struct _GimpOperationFillSourceClass GimpOperationFillSourceClass;
+
+struct _GimpOperationFillSource
+{
+  GeglOperationSource  parent_instance;
+
+  GimpFillOptions     *options;
+  GimpDrawable        *drawable;
+  gint                 pattern_offset_x;
+  gint                 pattern_offset_y;
+};
+
+struct _GimpOperationFillSourceClass
+{
+  GeglOperationSourceClass  parent_class;
+};
+
+
+GType   gimp_operation_fill_source_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_FILL_SOURCE_H__ */
diff --git a/app/operations/gimpoperationflood.c b/app/operations/gimpoperationflood.c
new file mode 100644
index 0000000..b35fe2e
--- /dev/null
+++ b/app/operations/gimpoperationflood.c
@@ -0,0 +1,1104 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationflood.c
+ * Copyright (C) 2016 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
+/* Implementation of the Flood algorithm.
+ * See https://wiki.gimp.org/wiki/Algorithms:Flood for details.
+ */
+
+
+#include "config.h"
+
+#include <string.h> /* For `memcpy()`. */
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationflood.h"
+
+
+/* Maximal gap, in pixels, between consecutive dirty ranges, below (and
+ * including) which they are coalesced, at the beginning of the distribution
+ * step.
+ */
+#define GIMP_OPERATION_FLOOD_COALESCE_MAX_GAP 32
+
+
+typedef struct _GimpOperationFloodSegment    GimpOperationFloodSegment;
+typedef struct _GimpOperationFloodDirtyRange GimpOperationFloodDirtyRange;
+typedef struct _GimpOperationFloodContext    GimpOperationFloodContext;
+
+
+/* A segment. */
+struct _GimpOperationFloodSegment
+{
+  /* A boolean flag indicating whether the image- and ROI-virtual coordinate
+   * systems should be transposed when processing this segment.  TRUE iff the
+   * segment is vertical.
+   */
+  guint  transpose      : 1;
+
+  /* The y-coordinate of the segment, in the ROI-virtual coordinate system. */
+  guint  y              : 8 * sizeof (guint) - 3;
+  /* The difference between the y-coordinates of the source segment and this
+   * segment, in the ROI-virtual coordinate system.  Either -1 or +1 for
+   * ordinary segments, and 0 for seed segments, as a special case.
+   *
+   * Note the use of `signed` as the type specifier.  The C standard doesn't
+   * specify the signedness of bit-fields whose type specifier is `int`, or a
+   * typedef-name defined as `int`, such as `gint`.
+   */
+  signed source_y_delta : 2;
+
+  /* The x-coordinates of the first and last pixels of the segment, in the ROI-
+   * virtual coordinate system.  Note that this is a closed range:
+   * [x[0], x[1]].
+   */
+  gint   x[2];
+};
+/* Make sure the maximal image dimension fits in
+ * `GimpOperationFloodSegment::y`.
+ */
+G_STATIC_ASSERT (GIMP_MAX_IMAGE_SIZE <= (1 << (8 * sizeof (guint) - 3)));
+
+/* A dirty range of the current segment. */
+struct _GimpOperationFloodDirtyRange
+{
+  /* A boolean flag indicating whether the range was extended, or its existing
+   * pixels were modified, during the horizontal propagation step.
+   */
+  gboolean modified;
+
+  /* The x-coordinates of the first and last pixels of the range, in the ROI-
+   * virtual coordinate system.  Note that this is a closed range:
+   * [x[0], x[1]].
+   */
+  gint     x[2];
+};
+
+/* Common parameters for the various parts of the algorithm. */
+struct _GimpOperationFloodContext
+{
+  /* Input image. */
+  GeglBuffer                *input;
+  /* Input image format. */
+  const Babl                *input_format;
+  /* Output image. */
+  GeglBuffer                *output;
+  /* Output image format. */
+  const Babl                *output_format;
+
+  /* Region of interset. */
+  GeglRectangle  roi;
+
+  /* Current segment. */
+  GimpOperationFloodSegment  segment;
+
+  /* The following arrays hold the ground- and water-level of the current- and
+   * source-segments.  The vertical- and horizontal-propagation steps don't
+   * generally access the input and output GEGL buffers directly, but rather
+   * read from, and write to, these arrays, for efficiency.  These arrays are
+   * read-from, and written-to, the corresponding GEGL buffers before and after
+   * these steps.
+   */
+
+  /* Ground level of the current segment, indexed by x-coordinate in the ROI-
+   * virtual coordinate system.  Only valid inside the range
+   * `[segment.x[0], segment.x[1]]`.
+   */
+  gfloat                    *ground;
+  /* Water level of the current segment, indexed by x-coordinate in the ROI-
+   * virtual coordinate system.  Initially only valid inside the range
+   * `[segment.x[0], segment.x[1]]`, but may be written-to outside this range
+   * during horizontal propagation, if the dirty ranges are extended past the
+   * bounds of the segment.
+   */
+  gfloat                    *water;
+  /* Water level of the source segment, indexed by x-coordinate in the ROI-
+   * virtual coordinate system.  Only valid inside the range
+   * `[segment.x[0], segment.x[1]]`.
+   */
+  gfloat                    *source_water;
+
+  /* A common buffer for the water level of the current- and source-segments.
+   * `water` and `source_water` are pointers into this buffer.  This buffer is
+   * used as an optimization, in order to read the water level of both segments
+   * from the output GEGL buffer in a single call, and is otherwise not used
+   * directly (`water` and `source_water` are used to access the water level
+   * instead.)
+   */
+  gfloat                    *water_buffer;
+};
+
+
+static void          gimp_operation_flood_prepare                      (GeglOperation                     *operation);
+static GeglRectangle gimp_operation_flood_get_required_for_output      (GeglOperation                     *self,
+                                                                        const gchar                       *input_pad,
+                                                                        const GeglRectangle               *roi);
+static GeglRectangle gimp_operation_flood_get_cached_region            (GeglOperation                     *self,
+                                                                        const GeglRectangle               *roi);
+
+static void          gimp_operation_flood_process_push                 (GQueue                            *queue,
+                                                                        gboolean                           transpose,
+                                                                        gint                               y,
+                                                                        gint                               source_y_delta,
+                                                                        gint                               x0,
+                                                                        gint                               x1);
+static void          gimp_operation_flood_process_seed                 (GQueue                            *queue,
+                                                                        const GeglRectangle               *roi);
+static void          gimp_operation_flood_process_transform_rect       (const GimpOperationFloodContext    *ctx,
+                                                                        GeglRectangle                      *dest,
+                                                                        const GeglRectangle                *src);
+static void          gimp_operation_flood_process_fetch                (GimpOperationFloodContext          *ctx);
+static gint          gimp_operation_flood_process_propagate_vertical   (GimpOperationFloodContext          *ctx,
+                                                                        GimpOperationFloodDirtyRange       *dirty_ranges);
+static void          gimp_operation_flood_process_propagate_horizontal (GimpOperationFloodContext          *ctx,
+                                                                        gint                                dir,
+                                                                        GimpOperationFloodDirtyRange       *dirty_ranges,
+                                                                        gint                                range_count);
+static gint         gimp_operation_flood_process_coalesce              (const GimpOperationFloodContext    *ctx,
+                                                                        GimpOperationFloodDirtyRange       *dirty_ranges,
+                                                                        gint                                range_count,
+                                                                        gint                                gap);
+static void          gimp_operation_flood_process_commit               (const GimpOperationFloodContext    *ctx,
+                                                                        const GimpOperationFloodDirtyRange *dirty_ranges,
+                                                                        gint                                range_count);
+static void          gimp_operation_flood_process_distribute           (const GimpOperationFloodContext    *ctx,
+                                                                        GQueue                             *queue,
+                                                                        const GimpOperationFloodDirtyRange *dirty_ranges,
+                                                                        gint                                range_count);
+static gboolean      gimp_operation_flood_process                      (GeglOperation                      *operation,
+                                                                        GeglBuffer                         *input,
+                                                                        GeglBuffer                         *output,
+                                                                        const GeglRectangle                *roi,
+                                                                        gint                                level);
+
+
+G_DEFINE_TYPE (GimpOperationFlood, gimp_operation_flood,
+               GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_flood_parent_class
+
+
+/* GEGL graph for the test case. */
+static const gchar* reference_xml = "<?xml version='1.0' encoding='UTF-8'?>"
+"<gegl>"
+"<node operation='gimp:flood'> </node>"
+"<node operation='gegl:load'>"
+"  <params>"
+"    <param name='path'>flood-input.png</param>"
+"  </params>"
+"</node>"
+"</gegl>";
+
+
+static void
+gimp_operation_flood_class_init (GimpOperationFloodClass *klass)
+{
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationFilterClass *filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  /* The input and output buffers must be different, since we generally need to
+   * be able to access the input-image values after having written to the
+   * output buffer.
+   */
+  operation_class->want_in_place = FALSE;
+  /* We don't want `GeglOperationFilter` to split the image across multiple
+   * threads, since this operation depends on, and affects, the image as a
+   * whole.
+   */
+  operation_class->threaded      = FALSE;
+  /* Note that both of these options are the default; we set them here for
+   * explicitness.
+   */
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:flood",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Flood operation",
+                                 "reference", "https://wiki.gimp.org/wiki/Algorithms:Flood",
+                                 "reference-image", "flood-output.png",
+                                 "reference-composition", reference_xml,
+                                 NULL);
+
+  operation_class->prepare                 = gimp_operation_flood_prepare;
+  operation_class->get_required_for_output = gimp_operation_flood_get_required_for_output;
+  operation_class->get_cached_region       = gimp_operation_flood_get_cached_region;
+
+  filter_class->process                    = gimp_operation_flood_process;
+}
+
+static void
+gimp_operation_flood_init (GimpOperationFlood *self)
+{
+}
+
+static void
+gimp_operation_flood_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("Y float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
+}
+
+static GeglRectangle
+gimp_operation_flood_get_required_for_output (GeglOperation       *self,
+                                              const gchar         *input_pad,
+                                              const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static GeglRectangle
+gimp_operation_flood_get_cached_region (GeglOperation       *self,
+                                        const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+
+/* Pushes a single segment into the queue. */
+static void
+gimp_operation_flood_process_push (GQueue   *queue,
+                                   gboolean  transpose,
+                                   gint      y,
+                                   gint      source_y_delta,
+                                   gint      x0,
+                                   gint      x1)
+{
+  GimpOperationFloodSegment *segment;
+
+  segment                 = g_slice_new (GimpOperationFloodSegment);
+
+  segment->transpose      = transpose;
+  segment->y              = y;
+  segment->source_y_delta = source_y_delta;
+  segment->x[0]           = x0;
+  segment->x[1]           = x1;
+
+  g_queue_push_tail (queue, segment);
+}
+
+/* Pushes the seed segments into the queue.  Recall that the seed segments are
+ * indicated by having their `source_y_delta` field equal 0.
+ *
+ * `roi` is given in the image-physical coordinate system.
+ */
+static void
+gimp_operation_flood_process_seed (GQueue              *queue,
+                                   const GeglRectangle *roi)
+{
+  if (roi->width == 0 || roi->height == 0)
+    return;
+
+  /* Top edge. */
+  gimp_operation_flood_process_push (queue,
+                                     /* transpose      = */ FALSE,
+                                     /* y              = */ 0,
+                                     /* source_y_delta = */ 0,
+                                     /* x0             = */ 0,
+                                     /* x1             = */ roi->width - 1);
+
+  if (roi->height == 1)
+    return;
+
+  /* Bottom edge. */
+  gimp_operation_flood_process_push (queue,
+                                     /* transpose      = */ FALSE,
+                                     /* y              = */ roi->height - 1,
+                                     /* source_y_delta = */ 0,
+                                     /* x0             = */ 0,
+                                     /* x1             = */ roi->width - 1);
+
+  if (roi->height == 2)
+    return;
+
+  /* Left edge. */
+  gimp_operation_flood_process_push (queue,
+                                     /* transpose      = */ TRUE,
+                                     /* y              = */ 0,
+                                     /* source_y_delta = */ 0,
+                                     /* x0             = */ 1,
+                                     /* x1             = */ roi->height - 2);
+
+  if (roi->width == 1)
+    return;
+
+  /* Right edge. */
+  gimp_operation_flood_process_push (queue,
+                                     /* transpose      = */ TRUE,
+                                     /* y              = */ roi->width - 1,
+                                     /* source_y_delta = */ 0,
+                                     /* x0             = */ 1,
+                                     /* x1             = */ roi->height - 2);
+}
+
+/* Transforms a `GeglRectangle` between the image-physical and image-virtual
+ * coordinate systems, in either direction, based on the attributes of the
+ * current segment (namely, its `transpose` flag.)
+ *
+ * Takes the input rectangle through `src`, and stores the result in `dest`.
+ * Both parameters may refer to the same object.
+ */
+static void
+gimp_operation_flood_process_transform_rect (const GimpOperationFloodContext *ctx,
+                                             GeglRectangle                   *dest,
+                                             const GeglRectangle             *src)
+{
+  if (! ctx->segment.transpose)
+    *dest = *src;
+  else
+    {
+      gint temp;
+
+      temp         = src->x;
+      dest->x      = src->y;
+      dest->y      = temp;
+
+      temp         = src->width;
+      dest->width  = src->height;
+      dest->height = temp;
+    }
+}
+
+/* Reads the ground- and water-level for the current- and source-segments from
+ * the GEGL buffers into the corresponding arrays.  Sets up the `water` and
+ * `source_water` pointers of `ctx` to point to the right location in
+ * `water_buffer`.
+ */
+static void
+gimp_operation_flood_process_fetch (GimpOperationFloodContext *ctx)
+{
+  /* Image-virtual and image-physical rectangles, respectively. */
+  GeglRectangle iv_rect, ip_rect;
+
+  /* Set the horizontal extent of the rectangle to span the entire segment. */
+  iv_rect.x     = ctx->roi.x + ctx->segment.x[0];
+  iv_rect.width = ctx->segment.x[1] - ctx->segment.x[0] + 1;
+
+  /* For reading the water level, we treat ordinary (non-seed) and seed
+   * segments differently.
+   */
+  if (ctx->segment.source_y_delta != 0)
+    {
+      /* Ordinary segment. */
+
+      /* We set the vertical extent of the rectangle to span both the current-
+       * and the source-segments, and set the `water` and `source_water`
+       * pointers to point to two consecutive rows of the `water_buffer` array
+       * (the y-coordinate of the rectangle, and which row is above which,
+       * depends on whether the source segment is above, or below, the current
+       * one.)
+       */
+      if (ctx->segment.source_y_delta < 0)
+        {
+          iv_rect.y         = ctx->roi.y + ctx->segment.y - 1;
+          ctx->water        = ctx->water_buffer + ctx->roi.width;
+          ctx->source_water = ctx->water_buffer;
+        }
+      else
+        {
+          iv_rect.y         = ctx->roi.y + ctx->segment.y;
+          ctx->water        = ctx->water_buffer;
+          ctx->source_water = ctx->water_buffer + ctx->roi.width;
+        }
+      iv_rect.height        = 2;
+
+      /* Transform `iv_rect` to the image-physical coordinate system, and store
+       * the result in `ip_rect`.
+       */
+      gimp_operation_flood_process_transform_rect (ctx, &ip_rect, &iv_rect);
+
+      /* Read the water level from the output GEGL buffer into `water_buffer`.
+       *
+       * Notice the stride:  If the current segment is horizontal, then we're
+       * reading a pair of rows directly into the correct locations inside
+       * `water_buffer` (i.e., `water` and `source_water`).  On the other hand,
+       * if the current segment is vertical, then we're reading a pair of
+       * *columns*; we set the stride to 2-pixels so that the current- and
+       * source-water levels are interleaved in `water_buffer`, and reorder
+       * them below.
+       */
+      gegl_buffer_get (ctx->output, &ip_rect, 1.0, ctx->output_format,
+                       ctx->water_buffer + ctx->segment.x[0],
+                       sizeof (gfloat) *
+                       (ctx->segment.transpose ? 2 : ctx->roi.width),
+                       GEGL_ABYSS_NONE);
+
+      /* As mentioned above, if the current segment is vertical, then the
+       * water levels of the current- and source-segments are interleaved in
+       * `water_buffer`.  We deinterleave the water levels into `water` and
+       * `source_water`, using the yet-to-be-written-to `ground` array as a
+       * temporary buffer, as necessary.
+       */
+      if (ctx->segment.transpose)
+        {
+          const gfloat *src;
+          gfloat       *dest1, *dest2, *temp;
+          gint          size, temp_size;
+          gint          i;
+
+          src       = ctx->water_buffer + ctx->segment.x[0];
+
+          dest1     = ctx->water_buffer + ctx->segment.x[0];
+          dest2     = ctx->water_buffer + ctx->roi.width + ctx->segment.x[0];
+          temp      = ctx->ground;
+
+          size      = ctx->segment.x[1] - ctx->segment.x[0] + 1;
+          temp_size = MAX (0, 2 * size - ctx->roi.width);
+
+          for (i = 0; i < temp_size; i++)
+            {
+              dest1[i] = src[2 * i];
+              temp[i]  = src[2 * i + 1];
+            }
+          for (; i < size; i++)
+            {
+              dest1[i] = src[2 * i];
+              dest2[i] = src[2 * i + 1];
+            }
+
+          memcpy (dest2, temp, sizeof (gfloat) * temp_size);
+        }
+    }
+  else
+    {
+      /* Seed segment. */
+
+      gint x;
+
+      /* Set the `water` and `source_water` pointers to point to consecutive
+       * rows of the `water_buffer` array.
+       */
+      ctx->water        = ctx->water_buffer;
+      ctx->source_water = ctx->water_buffer + ctx->roi.width;
+
+      /* Set the vertical extent of the rectangle to span a the current
+       * segment's row.
+       */
+      iv_rect.y      = ctx->roi.y + ctx->segment.y;
+      iv_rect.height = 1;
+
+      /* Transform `iv_rect` to the image-physical coordinate system, and store
+       * the result in `ip_rect`.
+       */
+      gimp_operation_flood_process_transform_rect (ctx, &ip_rect, &iv_rect);
+
+      /* Read the water level of the current segment from the output GEGL
+       * buffer into `water`.
+       */
+      gegl_buffer_get (ctx->output, &ip_rect, 1.0, ctx->output_format,
+                       ctx->water + ctx->segment.x[0],
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+      /* Initialize `source_water` to 0, as this is a seed segment. */
+      for (x = ctx->segment.x[0]; x <= ctx->segment.x[1]; x++)
+        ctx->source_water[x] = 0.0;
+    }
+
+  /* Set the vertical extent of the rectangle to span a the current segment's
+   * row.
+   */
+  iv_rect.y      = ctx->roi.y + ctx->segment.y;
+  iv_rect.height = 1;
+
+  /* Transform `iv_rect` to the image-physical coordinate system, and store the
+   * result in `ip_rect`.
+   */
+  gimp_operation_flood_process_transform_rect (ctx, &ip_rect, &iv_rect);
+
+  /* Read the ground level of the current segment from the input GEGL buffer
+   * into `ground`.
+   */
+  gegl_buffer_get (ctx->input, &ip_rect, 1.0, ctx->input_format,
+                   ctx->ground + ctx->segment.x[0],
+                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+}
+
+/* Performs the vertical propagation step of the algorithm.  Writes the dirty
+ * ranges to the `dirty_ranges` parameter, and returns the number of dirty
+ * ranges as the function's result.
+ */
+static gint
+gimp_operation_flood_process_propagate_vertical (GimpOperationFloodContext    *ctx,
+                                                 GimpOperationFloodDirtyRange *dirty_ranges)
+{
+  GimpOperationFloodDirtyRange *range = dirty_ranges;
+  gint                          x;
+
+  for (x = ctx->segment.x[0]; x <= ctx->segment.x[1]; x++)
+    {
+      /* Scan the segment until we find a pixel whose water level needs to be
+       * updated.
+       */
+      if (ctx->source_water[x] < ctx->water[x] &&
+          ctx->ground[x]       < ctx->water[x])
+        {
+          /* Compute and update the water level. */
+          gfloat level = MAX (ctx->source_water[x], ctx->ground[x]);
+
+          ctx->water[x] = level;
+
+          /* Start a new dirty range at the current pixel. */
+          range->x[0]     = x;
+          range->modified = FALSE;
+
+          for (x++; x <= ctx->segment.x[1]; x++)
+            {
+              /* Keep scanning the segment while the water level of consecutive
+               * pixels needs to be updated.
+               */
+              if (ctx->source_water[x] < ctx->water[x] &&
+                  ctx->ground[x]       < ctx->water[x])
+                {
+                  /* Compute and update the water level. */
+                  gfloat other_level = MAX (ctx->source_water[x],
+                                            ctx->ground[x]);
+
+                  ctx->water[x] = other_level;
+
+                  /* If the water level of the current pixel, `other_level`,
+                   * equals the water level of the current dirty range,
+                   * `level`, we keep scanning, making the current pixel part
+                   * of the current range.  On the other hand, if the current
+                   * pixel's water level is different than the that of the
+                   * current range, we finalize the range, and start a new one
+                   * at the current pixel.
+                   */
+                  if (other_level != level)
+                    {
+                      range->x[1]     = x - 1;
+                      range++;
+
+                      range->x[0]     = x;
+                      range->modified = FALSE;
+                      level           = other_level;
+                    }
+                }
+              else
+                break;
+            }
+
+          /* Finalize the current dirty range. */
+          range->x[1] = x - 1;
+          range++;
+
+          /* Make sure we don't over-increment `x` on the continuation of the
+           * loop.
+           */
+          if (x > ctx->segment.x[1])
+            break;
+        }
+    }
+
+  /* Return the number of dirty ranges. */
+  return range - dirty_ranges;
+}
+
+/* Performs a single pass of the horizontal propagation step of the algorithm.
+ * `dir` controls the direction of the pass: either +1 for a left-to-right
+ * pass, or -1 for a right-to-left pass.  The dirty ranges are passed through
+ * the `dirty_ranges` array (and their number in `range_count`), and are
+ * modified in-place.
+ */
+static void
+gimp_operation_flood_process_propagate_horizontal (GimpOperationFloodContext    *ctx,
+                                                   gint                          dir,
+                                                   GimpOperationFloodDirtyRange *dirty_ranges,
+                                                   gint                          range_count)
+{
+  /* The index of the terminal (i.e., "`dir`-most") component of the `x[]`
+   * array of `GimpOperationFloodSegment` and `GimpOperationFloodDirtyRange`,
+   * based on the scan direction.  Equals 1 (i.e., the right component) when
+   * `dir` is +1 (i.e., left-to-right), and equals 0 (i.e., the left component)
+   * when `dir` is -1 (i.e., right-to-left).
+   */
+  gint          x_component;
+  /* One-past the final x-coordinate of the ROI, in the ROI-virtual coordinate
+   * system, based on the scan direction.  That is, the x-coordinate of the
+   * pixel to the right of the rightmost pixel, for a left-to-right scan, and
+   * of the pixel to the left of the leftmost pixel, for a right-to-left scan.
+   */
+  gint          roi_lim;
+  /* One-past the final x-coordinate of the segment, in the ROI-virtual
+   * coordinate system, based on the scan direction, in a similar fashion to
+   * `roi_lim`.
+   */
+  gint          segment_lim;
+  /* The indices of the first, and one-past-the-last dirty ranges, based on the
+   * direction of the scan.  Recall that when scanning right-to-left, we
+   * iterate over the ranges in reverse.
+   */
+  gint          first_range, last_range;
+  /* Index of the current dirty range. */
+  gint          range_index;
+  /* Image-virtual and image-physical rectangles, respectively. */
+  GeglRectangle iv_rect, ip_rect;
+
+  /* Initialize the above variables based on the scan direction. */
+  if (dir > 0)
+    {
+      /* Left-to-right. */
+      x_component = 1;
+      roi_lim     = ctx->roi.width;
+      first_range = 0;
+      last_range  = range_count;
+    }
+  else
+    {
+      /* Right-to-left. */
+      x_component = 0;
+      roi_lim     = -1;
+      first_range = range_count - 1;
+      last_range  = -1;
+    }
+  segment_lim     = ctx->segment.x[x_component] + dir;
+
+  /* We loop over the dirty ranges, in the direction of the scan.  For each
+   * range, we iterate over the pixels, in the scan direction, starting at the
+   * outer edge of the range, and update the water level, considering only the
+   * water level of the previous and current pixels, until we arrive at a pixel
+   * whose water level remains the same, at which point we move to the next
+   * range, as described in the algorithm overview.
+   */
+  for (range_index  = first_range;
+       range_index != last_range;
+       range_index += dir)
+    {
+      /* Current dirty range. */
+      GimpOperationFloodDirtyRange *range;
+      /* Current pixel, in the ROI-virtual coordinate system. */
+      gint                          x;
+      /* We use `level` to compute the water level of the current pixel.  At
+       * the beginning of each iteration, it holds the water level of the
+       * previous pixel.
+       */
+      gfloat                        level;
+      /* The `inside` flag indicates whether `x` is inside the current segment.
+       * Recall that we may iterate past the bounds of the current segment, in
+       * which case we need to read the ground- and water-levels from the GEGL
+       * buffers directly, instead of the corresponding arrays.
+       */
+      gboolean                      inside;
+      /* Loop limit. */
+      gint                          lim;
+
+      range  = &dirty_ranges[range_index];
+      /* Last x-coordinate of the range, in the direction of the scan. */
+      x      = range->x[x_component];
+      /* We start iterating on the pixel after `x`; initialize `level` to the
+       * water level of the previous pixel.
+       */
+      level  = ctx->water[x];
+      /* The ranges produced by the vertical propagation step are all within
+       * the bounds of the segment; the horizontal propagation step may only
+       * extend them in the direction of the scan.  Therefore, on both passes
+       * of the horizontal propagation step, the last pixel of each range, in
+       * the direction of the scan, is initially inside the segment.
+       */
+      inside = TRUE;
+      /* If this isn't the last range, break the loop at the beginning of the
+       * next range.  Otherwise, break the loop at the edge of the ROI.
+       */
+      if (range_index + dir != last_range)
+        lim  = (range + dir)->x[1 - x_component];
+      else
+        lim  = roi_lim;
+
+      /* Loop over the pixels between the edge of the current range, and the
+       * beginning of the next range (or the edge of the ROI).
+       */
+      for (x += dir; x != lim; x += dir)
+        {
+          gfloat ground_level, water_level;
+
+          /* Recall that `segment_lim` is one-past the last pixel of the
+           * segment.  If we hit it, we've gone outside the segment bounds.
+           */
+          if (x == segment_lim)
+            {
+              inside         = FALSE;
+              /* Initialize the rectangle to sample pixels directly from the
+               * GEGL buffers.
+               */
+              iv_rect.y      = ctx->roi.y + ctx->segment.y;
+              iv_rect.width  = 1;
+              iv_rect.height = 1;
+            }
+
+          /* If we're inside the segment, read the ground- and water-levels
+           * from the corresponding arrays; otherwise, read them from the GEGL
+           * buffers directly.  Note that, on each pass, we may only write to
+           * pixels outside the segment *in direction of the scan* (in which
+           * case, the new values are written to the `water` array, but not
+           * directly to the output GEGL buffer), hence, when reading from the
+           * GEGL buffers, there's no danger of reading stale values, that were
+           * changed on the previous pass.
+           */
+          if (inside)
+            {
+              ground_level = ctx->ground[x];
+              water_level  = ctx->water[x];
+            }
+          else
+            {
+              iv_rect.x = ctx->roi.x + x;
+
+              /* Transform `iv_rect` to the image-physical coordinate system,
+               * and store the result in `ip_rect`.
+               */
+              gimp_operation_flood_process_transform_rect (ctx,
+                                                           &ip_rect, &iv_rect);
+
+              /* Read the current pixel's ground level. */
+              gegl_buffer_get (ctx->input, &ip_rect, 1.0, ctx->input_format,
+                               &ground_level,
+                               GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+              /* Read the current pixel's water level. */
+              gegl_buffer_get (ctx->output, &ip_rect, 1.0, ctx->output_format,
+                               &water_level,
+                               GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+            }
+
+          /* The new water level is the maximum of the current ground level,
+           * and the minimum of the current and previous water levels.  Recall
+           * that `level` holds the previous water level, and that the current
+           * water level is never less than the ground level.
+           */
+          if (level < ground_level)
+            level             = ground_level;
+          if (level < water_level)
+            {
+              /* The water level changed.  Update the current pixel, and set
+               * the `modified` flag of the current range, since it will be
+               * extended to include the current pixel.
+               */
+              ctx->water[x]   = level;
+              range->modified = TRUE;
+            }
+          else
+            /* The water level stayed the same.  Break the loop. */
+            break;
+        }
+
+      /* Extend the current dirty range to include the last modified pixel, if
+       * any.
+       */
+      range->x[x_component] = x - dir;
+
+      /* If we stopped the loop before hitting the edge of the next range, or
+       * if we're at the last range, continue to the next range (or quit).
+       */
+      if (x != lim || range_index + dir == last_range)
+        continue;
+
+      /* If we hit the edge of the next range, we keep propagating the changes
+       * *inside* the next range, until we hit its other edge, or until the
+       * water level stays the same.
+       */
+      range += dir;
+      lim    = range->x[x_component] + dir;
+
+      for (; x != lim; x += dir)
+        {
+          /* Note that we're necessarily inside the segment right now, since
+           * the only range that could have been extended past the edge of the
+           * segment by the previous pass, is the first range of the current
+           * pass, while the range we're currently inside is at least the
+           * second.
+           */
+          if (level < ctx->ground[x])
+            level             = ctx->ground[x];
+          if (level < ctx->water[x])
+            {
+              ctx->water[x]   = level;
+              /* Set the `modified` flag of the range, since the water level of
+               * its existing pixels changed.
+               */
+              range->modified = TRUE;
+            }
+          else
+            break;
+        }
+    }
+}
+
+/* Coalesces consecutive dirty ranges that are separated by a gap less-than or
+ * equal-to `max_gap`, in-place, and returns the new number of ranges.
+ */
+static gint
+gimp_operation_flood_process_coalesce (const GimpOperationFloodContext *ctx,
+                                       GimpOperationFloodDirtyRange    *dirty_ranges,
+                                       gint                             range_count,
+                                       gint                             max_gap)
+{
+  /* First and last ranges to coalesce, respectively. */
+  const GimpOperationFloodDirtyRange *first_range, *last_range;
+  /* Destination range. */
+  GimpOperationFloodDirtyRange       *range = dirty_ranges;
+
+  for (first_range  = dirty_ranges;
+       first_range != dirty_ranges + range_count;
+       first_range++)
+    {
+      /* The `modified` flag of the coalesced range -- the logical-OR of the
+       * `modified` flags of the individual ranges.
+       */
+      gboolean modified = first_range->modified;
+
+      /* Find all consecutive ranges with a small-enough gap. */
+      for (last_range      = first_range;
+           last_range + 1 != dirty_ranges + range_count;
+           last_range++)
+        {
+          if ((last_range + 1)->x[0] - last_range->x[1] > max_gap)
+            break;
+
+          modified |= (last_range + 1)->modified;
+        }
+
+      /* Write the coalesced range, or copy the current range, to the
+       * destination range.
+       */
+      if (first_range != last_range || first_range != range)
+        {
+          range->x[0]     = first_range->x[0];
+          range->x[1]     = last_range->x[1];
+          range->modified = modified;
+        }
+
+      first_range = last_range;
+      range++;
+    }
+
+  /* Return the new range count. */
+  return range - dirty_ranges;
+}
+
+/* Writes the updated water level of the dirty ranges back to the output GEGL
+ * buffer.
+ */
+static void
+gimp_operation_flood_process_commit (const GimpOperationFloodContext    *ctx,
+                                     const GimpOperationFloodDirtyRange *dirty_ranges,
+                                     gint                                range_count)
+{
+  const GimpOperationFloodDirtyRange *range;
+  /* Image-virtual and image-physical rectangles, respectively. */
+  GeglRectangle                       iv_rect, ip_rect;
+
+  /* Set the vertical extent of the rectangle to span a the current segment's
+   * row.
+   */
+  iv_rect.y      = ctx->roi.y + ctx->segment.y;
+  iv_rect.height = 1;
+
+  for (range = dirty_ranges; range != dirty_ranges + range_count; range++)
+    {
+      /* Set the horizontal extent of the rectangle to span the dirty range. */
+      iv_rect.x     = ctx->roi.x + range->x[0];
+      iv_rect.width = range->x[1] - range->x[0] + 1;
+
+      /* Transform `iv_rect` to the image-physical coordinate system, and store
+       * the result in `ip_rect`.
+       */
+      gimp_operation_flood_process_transform_rect (ctx, &ip_rect, &iv_rect);
+
+      /* Write the updated water level to the output GEGL buffer. */
+      gegl_buffer_set (ctx->output, &ip_rect, 0, ctx->output_format,
+                       ctx->water + range->x[0],
+                       GEGL_AUTO_ROWSTRIDE);
+    }
+}
+
+/* Pushes the new segments, corresponding to the dirty ranges of the current
+ * segment, into the queue.
+ */
+static void
+gimp_operation_flood_process_distribute (const GimpOperationFloodContext    *ctx,
+                                         GQueue                             *queue,
+                                         const GimpOperationFloodDirtyRange *dirty_ranges,
+                                         gint                                range_count)
+{
+  const GimpOperationFloodDirtyRange *range;
+  static const gint                   y_deltas[] = {-1, +1};
+  gint                                i;
+
+  /* For each neighboring row... */
+  for (i = 0; i < G_N_ELEMENTS (y_deltas); i++)
+    {
+      /* The difference between the negihboring row's y-coordinate and the
+       * current row's y-corindate, in the ROI-virtual coordinate system.
+       */
+      gint y_delta = y_deltas[i];
+      /* The negihboring row's y-coordinate in the ROI-virtual coordinate
+       * system.
+       */
+      gint y = ctx->segment.y + y_delta;
+
+      /* If the neighboring row is outside the ROI, skip it. */
+      if (y < 0 || y >= ctx->roi.height)
+        continue;
+
+      /* For each dirty range... */
+      for (range = dirty_ranges; range != dirty_ranges + range_count; range++)
+        {
+          /* If the range was modified during horizontal propagation, or if the
+           * neighboring row is not the source segment's row... (note that the
+           * latter is always true for seed segments.)
+           */
+          if (range->modified || y_delta != ctx->segment.source_y_delta)
+            {
+              /* Push a new segment into the queue, spanning the same pixels as
+               * the dirty range on the neighboring row, using the current row
+               * as its source segment.
+               */
+              gimp_operation_flood_process_push (queue,
+                                                 ctx->segment.transpose,
+                                                 y,
+                                                 -y_delta,
+                                                 range->x[0],
+                                                 range->x[1]);
+            }
+        }
+    }
+}
+
+/* Main algorithm. */
+static gboolean
+gimp_operation_flood_process (GeglOperation       *operation,
+                              GeglBuffer          *input,
+                              GeglBuffer          *output,
+                              const GeglRectangle *roi,
+                              gint                 level)
+{
+  const Babl                   *input_format  = gegl_operation_get_format (operation, "input");
+  const Babl                   *output_format = gegl_operation_get_format (operation, "output");
+  GeglColor                    *color;
+  gint                          max_size;
+  GimpOperationFloodContext     ctx;
+  GimpOperationFloodDirtyRange *dirty_ranges;
+  GQueue                       *queue;
+
+  /* Make sure the input- and output-buffers are different. */
+  g_return_val_if_fail (input != output, FALSE);
+
+  /* Make sure the ROI is small enough for the `GimpOperationFloodSegment::y`
+   * field.
+   */
+  g_return_val_if_fail (roi->width  <= GIMP_MAX_IMAGE_SIZE &&
+                        roi->height <= GIMP_MAX_IMAGE_SIZE, FALSE);
+
+  ctx.input         = input;
+  ctx.input_format  = input_format;
+  ctx.output        = output;
+  ctx.output_format = output_format;
+
+  /* All buffers need to have enough capacity to process a full row, or a full
+   * column, since, when processing vertical segments, we treat the image as
+   * transposed.
+   */
+  max_size          = MAX (roi->width, roi->height);
+  ctx.ground        = g_new (gfloat, max_size);
+  /* The `water_buffer` array needs to be able to hold two rows (or columns). */
+  ctx.water_buffer  = g_new (gfloat, 2 * max_size);
+  dirty_ranges      = g_new (GimpOperationFloodDirtyRange, max_size);
+
+  /* Initialize the water level to 1 everywhere. */
+  color = gegl_color_new ("#fff");
+  gegl_buffer_set_color (output, roi, color);
+  g_object_unref (color);
+
+  /* Create the queue and push the seed segments. */
+  queue  = g_queue_new ();
+  gimp_operation_flood_process_seed (queue, roi);
+
+  /* While there are segments to process in the queue... */
+  while (! g_queue_is_empty (queue))
+    {
+      GimpOperationFloodSegment *segment;
+      gint                       range_count;
+
+      /* Pop a segment off the top of the queue, copy it to `ctx.segment`, and
+       * free its memory.
+       */
+      segment     = (GimpOperationFloodSegment *) g_queue_pop_head (queue);
+      ctx.segment = *segment;
+      g_slice_free (GimpOperationFloodSegment, segment);
+
+      /* Transform the ROI from the image-physical coordinate system to the
+       * image-virtual coordinate system, and store the result in `ctx.roi`.
+       */
+      gimp_operation_flood_process_transform_rect (&ctx, &ctx.roi, roi);
+
+      /* Read the ground- and water-levels of the current- and source-segments
+       * from the corresponding GEGL buffers to the corresponding arrays.
+       */
+      gimp_operation_flood_process_fetch (&ctx);
+
+      /* Perform the vertical propagation step. */
+      range_count = gimp_operation_flood_process_propagate_vertical (&ctx,
+                                                                     dirty_ranges);
+      /* If no dirty ranges were produced during vertical propagation, then the
+       * water level of the current segment didn't change, and we can short-
+       * circuit early.
+       */
+      if (range_count == 0)
+        continue;
+
+      /* Perform both passes of the horizontal propagation step. */
+      gimp_operation_flood_process_propagate_horizontal (&ctx,
+                                                         /* Left-to-right */ +1,
+                                                         dirty_ranges,
+                                                         range_count);
+      gimp_operation_flood_process_propagate_horizontal (&ctx,
+                                                         /* Right-to-left */ -1,
+                                                         dirty_ranges,
+                                                         range_count);
+
+      /* Coalesce consecutive dirty ranges separated by a gap less-than or
+       * equal-to `GIMP_OPERATION_FLOOD_COALESCE_MAX_GAP`.
+       */
+      range_count = gimp_operation_flood_process_coalesce (&ctx,
+                                                           dirty_ranges,
+                                                           range_count,
+                                                           GIMP_OPERATION_FLOOD_COALESCE_MAX_GAP);
+
+      /* Write the updated water level back to the output GEGL buffer. */
+      gimp_operation_flood_process_commit (&ctx, dirty_ranges, range_count);
+
+      /* Push the new segments into the queue. */
+      gimp_operation_flood_process_distribute (&ctx, queue,
+                                               dirty_ranges, range_count);
+    }
+
+  g_queue_free (queue);
+
+  g_free (dirty_ranges);
+  g_free (ctx.water_buffer);
+  g_free (ctx.ground);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationflood.h b/app/operations/gimpoperationflood.h
new file mode 100644
index 0000000..ed2c1c6
--- /dev/null
+++ b/app/operations/gimpoperationflood.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationflood.h
+ * Copyright (C) 2016 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_FLOOD_H__
+#define __GIMP_OPERATION_FLOOD_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_FLOOD            (gimp_operation_flood_get_type ())
+#define GIMP_OPERATION_FLOOD(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_FLOOD, GimpOperationFlood))
+#define GIMP_OPERATION_FLOOD_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_FLOOD, GimpOperationFloodClass))
+#define GIMP_IS_OPERATION_FLOOD(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_FLOOD))
+#define GIMP_IS_OPERATION_FLOOD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_FLOOD))
+#define GIMP_OPERATION_FLOOD_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_FLOOD, GimpOperationFloodClass))
+
+
+typedef struct _GimpOperationFlood      GimpOperationFlood;
+typedef struct _GimpOperationFloodClass GimpOperationFloodClass;
+
+struct _GimpOperationFlood
+{
+  GeglOperationFilter  parent_instance;
+};
+
+struct _GimpOperationFloodClass
+{
+  GeglOperationFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_flood_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_FLOOD_H__ */
diff --git a/app/operations/gimpoperationgradient.c b/app/operations/gimpoperationgradient.c
new file mode 100644
index 0000000..2dbb746
--- /dev/null
+++ b/app/operations/gimpoperationgradient.c
@@ -0,0 +1,1283 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * Largely based on gimpdrawable-gradient.c
+ *
+ * gimpoperationgradient.c
+ * Copyright (C) 2014 Michael Henning <drawoc@darkrefraction.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "core/gimpgradient.h"
+
+#include "gimpoperationgradient.h"
+
+
+#define GRADIENT_CACHE_N_SUPERSAMPLES 4
+#define GRADIENT_CACHE_MAX_SIZE       ((1 << 20) / sizeof (GimpRGB))
+
+
+enum
+{
+  PROP_0,
+  PROP_CONTEXT,
+  PROP_GRADIENT,
+  PROP_START_X,
+  PROP_START_Y,
+  PROP_END_X,
+  PROP_END_Y,
+  PROP_GRADIENT_TYPE,
+  PROP_GRADIENT_REPEAT,
+  PROP_OFFSET,
+  PROP_GRADIENT_REVERSE,
+  PROP_GRADIENT_BLEND_COLOR_SPACE,
+  PROP_SUPERSAMPLE,
+  PROP_SUPERSAMPLE_DEPTH,
+  PROP_SUPERSAMPLE_THRESHOLD,
+  PROP_DITHER
+};
+
+typedef struct
+{
+  GimpGradient                *gradient;
+  gboolean                     reverse;
+  GimpGradientBlendColorSpace  blend_color_space;
+  GimpRGB                     *gradient_cache;
+  gint                         gradient_cache_size;
+  GimpGradientSegment         *last_seg;
+  gdouble                      offset;
+  gdouble                      sx, sy;
+  GimpGradientType             gradient_type;
+  gdouble                      dist;
+  gdouble                      vec[2];
+  GimpRepeatMode               repeat;
+  GeglSampler                 *dist_sampler;
+} RenderBlendData;
+
+
+typedef struct
+{
+  gfloat        *data;
+  GeglRectangle  roi;
+  GRand         *dither_rand;
+} PutPixelData;
+
+
+/*  local function prototypes  */
+
+static void            gimp_operation_gradient_dispose           (GObject               *gobject);
+static void            gimp_operation_gradient_finalize          (GObject               *gobject);
+static void            gimp_operation_gradient_get_property      (GObject               *object,
+                                                                  guint                  property_id,
+                                                                  GValue                *value,
+                                                                  GParamSpec            *pspec);
+static void            gimp_operation_gradient_set_property      (GObject               *object,
+                                                                  guint                  property_id,
+                                                                  const GValue          *value,
+                                                                  GParamSpec            *pspec);
+
+static void            gimp_operation_gradient_prepare           (GeglOperation         *operation);
+
+static GeglRectangle   gimp_operation_gradient_get_bounding_box  (GeglOperation         *operation);
+
+static gdouble         gradient_calc_conical_sym_factor          (gdouble                dist,
+                                                                  gdouble               *axis,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_conical_asym_factor         (gdouble                dist,
+                                                                  gdouble               *axis,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_square_factor               (gdouble                dist,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_radial_factor               (gdouble                dist,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_linear_factor               (gdouble                dist,
+                                                                  gdouble               *vec,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_bilinear_factor             (gdouble                dist,
+                                                                  gdouble               *vec,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_spiral_factor               (gdouble                dist,
+                                                                  gdouble               *axis,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y,
+                                                                  gboolean               clockwise);
+
+static gdouble         gradient_calc_shapeburst_angular_factor   (GeglSampler           *dist_sampler,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_shapeburst_spherical_factor (GeglSampler           *dist_sampler,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+static gdouble         gradient_calc_shapeburst_dimpled_factor   (GeglSampler           *dist_sampler,
+                                                                  gdouble                offset,
+                                                                  gdouble                x,
+                                                                  gdouble                y);
+
+static void            gradient_render_pixel                     (gdouble                x,
+                                                                  gdouble                y,
+                                                                  GimpRGB               *color,
+                                                                  gpointer               render_data);
+
+static void            gradient_put_pixel                        (gint                   x,
+                                                                  gint                   y,
+                                                                  GimpRGB               *color,
+                                                                  gpointer               put_pixel_data);
+
+static void            gradient_dither_pixel                     (GimpRGB               *color,
+                                                                  GRand                 *dither_rand,
+                                                                  gfloat                *dest);
+
+static gboolean        gimp_operation_gradient_process           (GeglOperation         *operation,
+                                                                  GeglBuffer            *input,
+                                                                  GeglBuffer            *output,
+                                                                  const GeglRectangle   *result,
+                                                                  gint                   level);
+
+static void            gimp_operation_gradient_invalidate_cache  (GimpOperationGradient *self);
+static void            gimp_operation_gradient_validate_cache    (GimpOperationGradient *self);
+
+
+G_DEFINE_TYPE (GimpOperationGradient, gimp_operation_gradient,
+               GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_gradient_parent_class
+
+
+static void
+gimp_operation_gradient_class_init (GimpOperationGradientClass *klass)
+{
+  GObjectClass             *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationFilterClass *filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  object_class->dispose             = gimp_operation_gradient_dispose;
+  object_class->finalize            = gimp_operation_gradient_finalize;
+  object_class->set_property        = gimp_operation_gradient_set_property;
+  object_class->get_property        = gimp_operation_gradient_get_property;
+
+  operation_class->prepare          = gimp_operation_gradient_prepare;
+  operation_class->get_bounding_box = gimp_operation_gradient_get_bounding_box;
+
+  filter_class->process             = gimp_operation_gradient_process;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:gradient",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Gradient operation",
+                                 NULL);
+
+  g_object_class_install_property (object_class, PROP_CONTEXT,
+                                   g_param_spec_object ("context",
+                                                        "Context",
+                                                        "A GimpContext",
+                                                        GIMP_TYPE_OBJECT,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_GRADIENT,
+                                   g_param_spec_object ("gradient",
+                                                        "Gradient",
+                                                        "A GimpGradient to render",
+                                                        GIMP_TYPE_OBJECT,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_START_X,
+                                   g_param_spec_double ("start-x",
+                                                        "Start X",
+                                                        "X coordinate of the first point",
+                                                        -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_START_Y,
+                                   g_param_spec_double ("start-y",
+                                                        "Start Y",
+                                                        "Y coordinate of the first point",
+                                                        -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_END_X,
+                                   g_param_spec_double ("end-x",
+                                                        "End X",
+                                                        "X coordinate of the second point",
+                                                        -G_MAXDOUBLE, G_MAXDOUBLE, 200,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_END_Y,
+                                   g_param_spec_double ("end-y",
+                                                        "End Y",
+                                                        "Y coordinate of the second point",
+                                                        -G_MAXDOUBLE, G_MAXDOUBLE, 200,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_GRADIENT_TYPE,
+                                   g_param_spec_enum ("gradient-type",
+                                                      "Gradient Type",
+                                                      "The type of gradient to render",
+                                                      GIMP_TYPE_GRADIENT_TYPE,
+                                                      GIMP_GRADIENT_LINEAR,
+                                                      G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_GRADIENT_REPEAT,
+                                   g_param_spec_enum ("gradient-repeat",
+                                                      "Repeat mode",
+                                                      "Repeat mode",
+                                                      GIMP_TYPE_REPEAT_MODE,
+                                                      GIMP_REPEAT_NONE,
+                                                      G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_OFFSET,
+                                   g_param_spec_double ("offset",
+                                                        "Offset",
+                                                        "Offset relates to the starting and ending coordinates "
+                                                        "specified for the blend. This parameter is mode dependent.",
+                                                        0, G_MAXDOUBLE, 0,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_GRADIENT_REVERSE,
+                                   g_param_spec_boolean ("gradient-reverse",
+                                                         "Reverse",
+                                                         "Reverse the gradient",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_GRADIENT_BLEND_COLOR_SPACE,
+                                   g_param_spec_enum ("gradient-blend-color-space",
+                                                      "Blend Color Space",
+                                                      "Which color space to use when blending RGB gradient segments",
+                                                      GIMP_TYPE_GRADIENT_BLEND_COLOR_SPACE,
+                                                      GIMP_GRADIENT_BLEND_RGB_PERCEPTUAL,
+                                                      G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_SUPERSAMPLE,
+                                   g_param_spec_boolean ("supersample",
+                                                         "Supersample",
+                                                         "Do adaptive supersampling",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_SUPERSAMPLE_DEPTH,
+                                   g_param_spec_int ("supersample-depth",
+                                                     "Max depth",
+                                                     "Maximum recursion levels for supersampling",
+                                                     1, 9, 3,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_SUPERSAMPLE_THRESHOLD,
+                                   g_param_spec_double ("supersample-threshold",
+                                                        "Threshold",
+                                                        "Supersampling threshold",
+                                                        0, 4, 0.20,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_DITHER,
+                                   g_param_spec_boolean ("dither",
+                                                         "Dither",
+                                                         "Use dithering to reduce banding",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_gradient_init (GimpOperationGradient *self)
+{
+  g_mutex_init (&self->gradient_cache_mutex);
+}
+
+static void
+gimp_operation_gradient_dispose (GObject *object)
+{
+  GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+  gimp_operation_gradient_invalidate_cache (self);
+
+  g_clear_object (&self->gradient);
+  g_clear_object (&self->context);
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_gradient_finalize (GObject *object)
+{
+  GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+  g_mutex_clear (&self->gradient_cache_mutex);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_gradient_get_property (GObject    *object,
+                                      guint       property_id,
+                                      GValue     *value,
+                                      GParamSpec *pspec)
+{
+ GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+  switch (property_id)
+    {
+    case PROP_CONTEXT:
+      g_value_set_object (value, self->context);
+      break;
+
+    case PROP_GRADIENT:
+      g_value_set_object (value, self->gradient);
+      break;
+
+    case PROP_START_X:
+      g_value_set_double (value, self->start_x);
+      break;
+
+    case PROP_START_Y:
+      g_value_set_double (value, self->start_y);
+      break;
+
+    case PROP_END_X:
+      g_value_set_double (value, self->end_x);
+      break;
+
+    case PROP_END_Y:
+      g_value_set_double (value, self->end_y);
+      break;
+
+    case PROP_GRADIENT_TYPE:
+      g_value_set_enum (value, self->gradient_type);
+      break;
+
+    case PROP_GRADIENT_REPEAT:
+      g_value_set_enum (value, self->gradient_repeat);
+      break;
+
+    case PROP_OFFSET:
+      g_value_set_double (value, self->offset);
+      break;
+
+    case PROP_GRADIENT_REVERSE:
+      g_value_set_boolean (value, self->gradient_reverse);
+      break;
+
+    case PROP_GRADIENT_BLEND_COLOR_SPACE:
+      g_value_set_enum (value, self->gradient_blend_color_space);
+      break;
+
+    case PROP_SUPERSAMPLE:
+      g_value_set_boolean (value, self->supersample);
+      break;
+
+    case PROP_SUPERSAMPLE_DEPTH:
+      g_value_set_int (value, self->supersample_depth);
+      break;
+
+    case PROP_SUPERSAMPLE_THRESHOLD:
+      g_value_set_double (value, self->supersample_threshold);
+      break;
+
+    case PROP_DITHER:
+      g_value_set_boolean (value, self->dither);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_gradient_set_property (GObject      *object,
+                                      guint         property_id,
+                                      const GValue *value,
+                                      GParamSpec   *pspec)
+{
+  GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+  switch (property_id)
+    {
+    case PROP_CONTEXT:
+      if (self->context)
+        g_object_unref (self->context);
+
+      self->context = g_value_dup_object (value);
+      break;
+
+    case PROP_GRADIENT:
+      {
+        GimpGradient *gradient = g_value_get_object (value);
+
+        g_clear_object (&self->gradient);
+
+        if (gradient)
+          {
+            if (gimp_gradient_has_fg_bg_segments (gradient))
+              self->gradient = gimp_gradient_flatten (gradient, self->context);
+            else
+              self->gradient = g_object_ref (gradient);
+          }
+
+        gimp_operation_gradient_invalidate_cache (self);
+      }
+      break;
+
+    case PROP_START_X:
+      self->start_x = g_value_get_double (value);
+
+      gimp_operation_gradient_invalidate_cache (self);
+      break;
+
+    case PROP_START_Y:
+      self->start_y = g_value_get_double (value);
+
+      gimp_operation_gradient_invalidate_cache (self);
+      break;
+
+    case PROP_END_X:
+      self->end_x = g_value_get_double (value);
+
+      gimp_operation_gradient_invalidate_cache (self);
+      break;
+
+    case PROP_END_Y:
+      self->end_y = g_value_get_double (value);
+
+      gimp_operation_gradient_invalidate_cache (self);
+      break;
+
+    case PROP_GRADIENT_TYPE:
+      self->gradient_type = g_value_get_enum (value);
+      break;
+
+    case PROP_GRADIENT_REPEAT:
+      self->gradient_repeat = g_value_get_enum (value);
+      break;
+
+    case PROP_OFFSET:
+      self->offset = g_value_get_double (value);
+      break;
+
+    case PROP_GRADIENT_REVERSE:
+      self->gradient_reverse = g_value_get_boolean (value);
+
+      gimp_operation_gradient_invalidate_cache (self);
+      break;
+
+    case PROP_GRADIENT_BLEND_COLOR_SPACE:
+      self->gradient_blend_color_space = g_value_get_enum (value);
+
+      gimp_operation_gradient_invalidate_cache (self);
+      break;
+
+    case PROP_SUPERSAMPLE:
+      self->supersample = g_value_get_boolean (value);
+      break;
+
+    case PROP_SUPERSAMPLE_DEPTH:
+      self->supersample_depth = g_value_get_int (value);
+      break;
+
+    case PROP_SUPERSAMPLE_THRESHOLD:
+      self->supersample_threshold = g_value_get_double (value);
+      break;
+
+    case PROP_DITHER:
+      self->dither = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_gradient_prepare (GeglOperation *operation)
+{
+  gegl_operation_set_format (operation, "output", babl_format ("R'G'B'A float"));
+}
+
+static GeglRectangle
+gimp_operation_gradient_get_bounding_box (GeglOperation *operation)
+{
+  return gegl_rectangle_infinite_plane ();
+}
+
+static gdouble
+gradient_calc_conical_sym_factor (gdouble  dist,
+                                  gdouble *axis,
+                                  gdouble  offset,
+                                  gdouble  x,
+                                  gdouble  y)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else if ((x != 0) || (y != 0))
+    {
+      gdouble vec[2];
+      gdouble r;
+      gdouble rat;
+
+      /* Calculate offset from the start in pixels */
+
+      r = sqrt (SQR (x) + SQR (y));
+
+      vec[0] = x / r;
+      vec[1] = y / r;
+
+      rat = axis[0] * vec[0] + axis[1] * vec[1]; /* Dot product */
+
+      if (rat > 1.0)
+        rat = 1.0;
+      else if (rat < -1.0)
+        rat = -1.0;
+
+      /* This cool idea is courtesy Josh MacDonald,
+       * Ali Rahimi --- two more XCF losers.  */
+
+      rat = acos (rat) / G_PI;
+      rat = pow (rat, (offset / 10.0) + 1.0);
+
+      return CLAMP (rat, 0.0, 1.0);
+    }
+  else
+    {
+      return 0.5;
+    }
+}
+
+static gdouble
+gradient_calc_conical_asym_factor (gdouble  dist,
+                                   gdouble *axis,
+                                   gdouble  offset,
+                                   gdouble  x,
+                                   gdouble  y)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else if (x != 0 || y != 0)
+    {
+      gdouble ang0, ang1;
+      gdouble ang;
+      gdouble rat;
+
+      ang0 = atan2 (axis[0], axis[1]) + G_PI;
+
+      ang1 = atan2 (x, y) + G_PI;
+
+      ang = ang1 - ang0;
+
+      if (ang < 0.0)
+        ang += (2.0 * G_PI);
+
+      rat = ang / (2.0 * G_PI);
+      rat = pow (rat, (offset / 10.0) + 1.0);
+
+      return CLAMP (rat, 0.0, 1.0);
+    }
+  else
+    {
+      return 0.5; /* We are on middle point */
+    }
+}
+
+static gdouble
+gradient_calc_square_factor (gdouble dist,
+                             gdouble offset,
+                             gdouble x,
+                             gdouble y)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else
+    {
+      gdouble r;
+      gdouble rat;
+
+      /* Calculate offset from start as a value in [0, 1] */
+
+      offset = offset / 100.0;
+
+      r   = MAX (fabs (x), fabs (y));
+      rat = r / dist;
+
+      if (rat < offset)
+        return 0.0;
+      else if (offset == 1.0)
+        return (rat >= 1.0) ? 1.0 : 0.0;
+      else
+        return (rat - offset) / (1.0 - offset);
+    }
+}
+
+static gdouble
+gradient_calc_radial_factor (gdouble dist,
+                             gdouble offset,
+                             gdouble x,
+                             gdouble y)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else
+    {
+      gdouble r;
+      gdouble rat;
+
+      /* Calculate radial offset from start as a value in [0, 1] */
+
+      offset = offset / 100.0;
+
+      r   = sqrt (SQR (x) + SQR (y));
+      rat = r / dist;
+
+      if (rat < offset)
+        return 0.0;
+      else if (offset == 1.0)
+        return (rat >= 1.0) ? 1.0 : 0.0;
+      else
+        return (rat - offset) / (1.0 - offset);
+    }
+}
+
+static gdouble
+gradient_calc_linear_factor (gdouble  dist,
+                             gdouble *vec,
+                             gdouble  offset,
+                             gdouble  x,
+                             gdouble  y)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else
+    {
+      gdouble r;
+      gdouble rat;
+
+      offset = offset / 100.0;
+
+      r   = vec[0] * x + vec[1] * y;
+      rat = r / dist;
+
+      if (rat >= 0.0 && rat < offset)
+        return 0.0;
+      else if (offset == 1.0)
+        return (rat >= 1.0) ? 1.0 : 0.0;
+      else if (rat < 0.0)
+        return rat / (1.0 - offset);
+      else
+        return (rat - offset) / (1.0 - offset);
+    }
+}
+
+static gdouble
+gradient_calc_bilinear_factor (gdouble  dist,
+                               gdouble *vec,
+                               gdouble  offset,
+                               gdouble  x,
+                               gdouble  y)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else
+    {
+      gdouble r;
+      gdouble rat;
+
+      /* Calculate linear offset from the start line outward */
+
+      offset = offset / 100.0;
+
+      r   = vec[0] * x + vec[1] * y;
+      rat = r / dist;
+
+      if (fabs (rat) < offset)
+        return 0.0;
+      else if (offset == 1.0)
+        return (rat == 1.0) ? 1.0 : 0.0;
+      else
+        return (fabs (rat) - offset) / (1.0 - offset);
+    }
+}
+
+static gdouble
+gradient_calc_spiral_factor (gdouble   dist,
+                             gdouble  *axis,
+                             gdouble   offset,
+                             gdouble   x,
+                             gdouble   y,
+                             gboolean  clockwise)
+{
+  if (dist == 0.0)
+    {
+      return 0.0;
+    }
+  else if (x != 0.0 || y != 0.0)
+    {
+      gdouble ang0, ang1;
+      gdouble ang;
+      double  r;
+
+      offset = offset / 100.0;
+
+      ang0 = atan2 (axis[0], axis[1]) + G_PI;
+      ang1 = atan2 (x, y) + G_PI;
+
+      if (clockwise)
+        ang = ang1 - ang0;
+      else
+        ang = ang0 - ang1;
+
+      if (ang < 0.0)
+        ang += (2.0 * G_PI);
+
+      r = sqrt (SQR (x) + SQR (y)) / dist;
+
+      return fmod (ang / (2.0 * G_PI) + r + offset, 1.0);
+    }
+  else
+    {
+      return 0.5 ; /* We are on the middle point */
+    }
+}
+
+static gdouble
+gradient_calc_shapeburst_angular_factor (GeglSampler *dist_sampler,
+                                         gdouble      offset,
+                                         gdouble      x,
+                                         gdouble      y)
+{
+  gfloat value;
+
+  offset = offset / 100.0;
+
+  gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
+
+  value = 1.0 - value;
+
+  if (value < offset)
+    value = 0.0;
+  else if (offset == 1.0)
+    value = (value >= 1.0) ? 1.0 : 0.0;
+  else
+    value = (value - offset) / (1.0 - offset);
+
+  return value;
+}
+
+
+static gdouble
+gradient_calc_shapeburst_spherical_factor (GeglSampler *dist_sampler,
+                                           gdouble      offset,
+                                           gdouble      x,
+                                           gdouble      y)
+{
+  gfloat value;
+
+  offset = 1.0 - offset / 100.0;
+
+  gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
+
+  if (value > offset)
+    value = 1.0;
+  else if (offset == 0.0)
+    value = (value <= 0.0) ? 0.0 : 1.0;
+  else
+    value = value / offset;
+
+  value = 1.0 - sin (0.5 * G_PI * value);
+
+  return value;
+}
+
+
+static gdouble
+gradient_calc_shapeburst_dimpled_factor (GeglSampler *dist_sampler,
+                                         gdouble      offset,
+                                         gdouble      x,
+                                         gdouble      y)
+{
+  gfloat value;
+
+  offset = 1.0 - offset / 100.0;
+
+  gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
+
+  if (value > offset)
+    value = 1.0;
+  else if (offset == 0.0)
+    value = (value <= 0.0) ? 0.0 : 1.0;
+  else
+    value = value / offset;
+
+  value = cos (0.5 * G_PI * value);
+
+  return value;
+}
+
+static void
+gradient_render_pixel (gdouble   x,
+                       gdouble   y,
+                       GimpRGB  *color,
+                       gpointer  render_data)
+{
+  RenderBlendData *rbd = render_data;
+  gdouble          factor;
+
+  /*  we want to calculate the color at the pixel's center  */
+  x += 0.5;
+  y += 0.5;
+
+  /* Calculate blending factor */
+
+  switch (rbd->gradient_type)
+    {
+    case GIMP_GRADIENT_LINEAR:
+      factor = gradient_calc_linear_factor (rbd->dist,
+                                            rbd->vec, rbd->offset,
+                                            x - rbd->sx, y - rbd->sy);
+      break;
+
+    case GIMP_GRADIENT_BILINEAR:
+      factor = gradient_calc_bilinear_factor (rbd->dist,
+                                              rbd->vec, rbd->offset,
+                                              x - rbd->sx, y - rbd->sy);
+      break;
+
+    case GIMP_GRADIENT_RADIAL:
+      factor = gradient_calc_radial_factor (rbd->dist,
+                                            rbd->offset,
+                                            x - rbd->sx, y - rbd->sy);
+      break;
+
+    case GIMP_GRADIENT_SQUARE:
+      factor = gradient_calc_square_factor (rbd->dist, rbd->offset,
+                                            x - rbd->sx, y - rbd->sy);
+      break;
+
+    case GIMP_GRADIENT_CONICAL_SYMMETRIC:
+      factor = gradient_calc_conical_sym_factor (rbd->dist,
+                                                 rbd->vec, rbd->offset,
+                                                 x - rbd->sx, y - rbd->sy);
+      break;
+
+    case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
+      factor = gradient_calc_conical_asym_factor (rbd->dist,
+                                                  rbd->vec, rbd->offset,
+                                                  x - rbd->sx, y - rbd->sy);
+      break;
+
+    case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
+      factor = gradient_calc_shapeburst_angular_factor (rbd->dist_sampler,
+                                                        rbd->offset,
+                                                        x, y);
+      break;
+
+    case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
+      factor = gradient_calc_shapeburst_spherical_factor (rbd->dist_sampler,
+                                                          rbd->offset,
+                                                          x, y);
+      break;
+
+    case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
+      factor = gradient_calc_shapeburst_dimpled_factor (rbd->dist_sampler,
+                                                        rbd->offset,
+                                                        x, y);
+      break;
+
+    case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
+      factor = gradient_calc_spiral_factor (rbd->dist,
+                                            rbd->vec, rbd->offset,
+                                            x - rbd->sx, y - rbd->sy, TRUE);
+      break;
+
+    case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
+      factor = gradient_calc_spiral_factor (rbd->dist,
+                                            rbd->vec, rbd->offset,
+                                            x - rbd->sx, y - rbd->sy, FALSE);
+      break;
+
+    default:
+      g_return_if_reached ();
+      break;
+    }
+
+  /* Adjust for repeat */
+
+  switch (rbd->repeat)
+    {
+    case GIMP_REPEAT_NONE:
+      break;
+
+    case GIMP_REPEAT_SAWTOOTH:
+      factor = factor - floor (factor);
+      break;
+
+    case GIMP_REPEAT_TRIANGULAR:
+      {
+        guint ifactor;
+
+        if (factor < 0.0)
+          factor = -factor;
+
+        ifactor = (guint) factor;
+        factor = factor - floor (factor);
+
+        if (ifactor & 1)
+          factor = 1.0 - factor;
+      }
+      break;
+
+    case GIMP_REPEAT_TRUNCATE:
+      if (factor < 0.0 || factor > 1.0)
+        {
+          gimp_rgba_set (color, 0.0, 0.0, 0.0, 0.0);
+          return;
+        }
+      break;
+    }
+
+  /* Blend the colors */
+
+  if (rbd->gradient_cache)
+    {
+      factor = CLAMP (factor, 0.0, 1.0);
+
+      *color =
+        rbd->gradient_cache[ROUND (factor * (rbd->gradient_cache_size - 1))];
+    }
+  else
+    {
+      rbd->last_seg = gimp_gradient_get_color_at (rbd->gradient, NULL,
+                                                  rbd->last_seg, factor,
+                                                  rbd->reverse,
+                                                  rbd->blend_color_space,
+                                                  color);
+    }
+}
+
+static void
+gradient_put_pixel (gint      x,
+                    gint      y,
+                    GimpRGB  *color,
+                    gpointer  put_pixel_data)
+{
+  PutPixelData *ppd   = put_pixel_data;
+  const gint    index = (y - ppd->roi.y) * ppd->roi.width + (x - ppd->roi.x);
+  gfloat       *dest  = ppd->data + 4 * index;
+
+  if (ppd->dither_rand)
+    {
+      gradient_dither_pixel (color, ppd->dither_rand, dest);
+
+      dest += 4;
+    }
+  else
+    {
+      *dest++ = color->r;
+      *dest++ = color->g;
+      *dest++ = color->b;
+      *dest++ = color->a;
+    }
+}
+
+static void
+gradient_dither_pixel (GimpRGB *color,
+                       GRand   *dither_rand,
+                       gfloat  *dest)
+{
+  gfloat r, g, b, a;
+  guint  i;
+
+  i = g_rand_int (dither_rand);
+
+  r = color->r + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0; i >>= 8;
+  g = color->g + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0; i >>= 8;
+  b = color->b + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0; i >>= 8;
+
+  if (color->a > 0.0 && color->a < 1.0)
+    a = color->a + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0;
+  else
+    a = color->a;
+
+  *dest++ = CLAMP (r, 0.0, 1.0);
+  *dest++ = CLAMP (g, 0.0, 1.0);
+  *dest++ = CLAMP (b, 0.0, 1.0);
+  *dest++ = CLAMP (a, 0.0, 1.0);
+}
+
+static gboolean
+gimp_operation_gradient_process (GeglOperation       *operation,
+                                 GeglBuffer          *input,
+                                 GeglBuffer          *output,
+                                 const GeglRectangle *result,
+                                 gint                 level)
+{
+  GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (operation);
+
+  const gdouble sx = self->start_x;
+  const gdouble sy = self->start_y;
+  const gdouble ex = self->end_x;
+  const gdouble ey = self->end_y;
+
+  RenderBlendData rbd = { 0, };
+
+  GeglBufferIterator *iter;
+  GeglRectangle      *roi;
+  GRand              *dither_rand = NULL;
+
+  if (! self->gradient)
+    return TRUE;
+
+  gimp_operation_gradient_validate_cache (self);
+
+  rbd.gradient            = self->gradient;
+  rbd.reverse             = self->gradient_reverse;
+  rbd.blend_color_space   = self->gradient_blend_color_space;
+  rbd.gradient_cache      = self->gradient_cache;
+  rbd.gradient_cache_size = self->gradient_cache_size;
+
+  /* Calculate type-specific parameters */
+
+  switch (self->gradient_type)
+    {
+    case GIMP_GRADIENT_RADIAL:
+      rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
+      break;
+
+    case GIMP_GRADIENT_SQUARE:
+      rbd.dist = MAX (fabs (ex - sx), fabs (ey - sy));
+      break;
+
+    case GIMP_GRADIENT_CONICAL_SYMMETRIC:
+    case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
+    case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
+    case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
+    case GIMP_GRADIENT_LINEAR:
+    case GIMP_GRADIENT_BILINEAR:
+      rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
+
+      if (rbd.dist > 0.0)
+        {
+          rbd.vec[0] = (ex - sx) / rbd.dist;
+          rbd.vec[1] = (ey - sy) / rbd.dist;
+        }
+
+      break;
+
+    case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
+    case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
+    case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
+      rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
+      rbd.dist_sampler = gegl_buffer_sampler_new_at_level (
+        input, babl_format ("Y float"), GEGL_SAMPLER_NEAREST, level);
+      break;
+
+    default:
+      g_return_val_if_reached (FALSE);
+      break;
+    }
+
+  /* Initialize render data */
+
+  rbd.offset        = self->offset;
+  rbd.sx            = self->start_x;
+  rbd.sy            = self->start_y;
+  rbd.gradient_type = self->gradient_type;
+  rbd.repeat        = self->gradient_repeat;
+
+  /* Render the gradient! */
+
+  iter = gegl_buffer_iterator_new (output, result, 0,
+                                   babl_format ("R'G'B'A float"),
+                                   GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
+  roi = &iter->items[0].roi;
+
+  if (self->dither)
+    dither_rand = g_rand_new ();
+
+  if (self->supersample)
+    {
+      PutPixelData ppd;
+
+      ppd.dither_rand = dither_rand;
+
+      while (gegl_buffer_iterator_next (iter))
+        {
+          ppd.data = iter->items[0].data;
+          ppd.roi  = *roi;
+
+          gimp_adaptive_supersample_area (roi->x, roi->y,
+                                          roi->x + roi->width  - 1,
+                                          roi->y + roi->height - 1,
+                                          self->supersample_depth,
+                                          self->supersample_threshold,
+                                          gradient_render_pixel, &rbd,
+                                          gradient_put_pixel, &ppd,
+                                          NULL,
+                                          NULL);
+        }
+    }
+  else
+    {
+      while (gegl_buffer_iterator_next (iter))
+        {
+          gfloat *dest = iter->items[0].data;
+          gint    endx = roi->x + roi->width;
+          gint    endy = roi->y + roi->height;
+          gint    x, y;
+
+          if (dither_rand)
+            {
+              for (y = roi->y; y < endy; y++)
+                for (x = roi->x; x < endx; x++)
+                  {
+                    GimpRGB  color = { 0.0, 0.0, 0.0, 1.0 };
+
+                    gradient_render_pixel (x, y, &color, &rbd);
+                    gradient_dither_pixel (&color, dither_rand, dest);
+
+                    dest += 4;
+                  }
+            }
+          else
+            {
+              for (y = roi->y; y < endy; y++)
+                for (x = roi->x; x < endx; x++)
+                  {
+                    GimpRGB  color = { 0.0, 0.0, 0.0, 1.0 };
+
+                    gradient_render_pixel (x, y, &color, &rbd);
+
+                    *dest++ = color.r;
+                    *dest++ = color.g;
+                    *dest++ = color.b;
+                    *dest++ = color.a;
+                  }
+            }
+        }
+    }
+
+  if (self->dither)
+    g_rand_free (dither_rand);
+
+  g_clear_object (&rbd.dist_sampler);
+
+  return TRUE;
+}
+
+static void
+gimp_operation_gradient_invalidate_cache (GimpOperationGradient *self)
+{
+  g_clear_pointer (&self->gradient_cache, g_free);
+}
+
+static void
+gimp_operation_gradient_validate_cache (GimpOperationGradient *self)
+{
+  GimpGradientSegment *last_seg = NULL;
+  gint                 cache_size;
+  gint                 i;
+
+  if (! self->gradient)
+    return;
+
+  g_mutex_lock (&self->gradient_cache_mutex);
+
+  if (self->gradient_cache)
+    {
+      g_mutex_unlock (&self->gradient_cache_mutex);
+
+      return;
+    }
+
+  cache_size = ceil (hypot (self->start_x - self->end_x,
+                            self->start_y - self->end_y)) *
+               GRADIENT_CACHE_N_SUPERSAMPLES;
+
+  /*  have at least two values in the cache  */
+  cache_size = MAX (cache_size, 2);
+
+  /*  don't use a cache if its necessary size is too big  */
+  if (cache_size > GRADIENT_CACHE_MAX_SIZE)
+    {
+      g_mutex_unlock (&self->gradient_cache_mutex);
+
+      return;
+    }
+
+  self->gradient_cache      = g_new0 (GimpRGB, cache_size);
+  self->gradient_cache_size = cache_size;
+
+  for (i = 0; i < self->gradient_cache_size; i++)
+    {
+      gdouble factor = (gdouble) i / (gdouble) (self->gradient_cache_size - 1);
+
+      last_seg = gimp_gradient_get_color_at (self->gradient, NULL, last_seg,
+                                             factor,
+                                             self->gradient_reverse,
+                                             self->gradient_blend_color_space,
+                                             self->gradient_cache + i);
+    }
+
+  g_mutex_unlock (&self->gradient_cache_mutex);
+}
diff --git a/app/operations/gimpoperationgradient.h b/app/operations/gimpoperationgradient.h
new file mode 100644
index 0000000..e2aa19c
--- /dev/null
+++ b/app/operations/gimpoperationgradient.h
@@ -0,0 +1,73 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgradient.h
+ * Copyright (C) 2014 Michael Henning <drawoc@darkrefraction.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_GRADIENT_H__
+#define __GIMP_OPERATION_GRADIENT_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_GRADIENT            (gimp_operation_gradient_get_type ())
+#define GIMP_OPERATION_GRADIENT(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_GRADIENT, GimpOperationGradient))
+#define GIMP_OPERATION_GRADIENT_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_GRADIENT, GimpOperationGradientClass))
+#define GIMP_IS_OPERATION_GRADIENT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_GRADIENT))
+#define GIMP_IS_OPERATION_GRADIENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_GRADIENT))
+#define GIMP_OPERATION_GRADIENT_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_GRADIENT, GimpOperationGradientClass))
+
+
+typedef struct _GimpOperationGradient      GimpOperationGradient;
+typedef struct _GimpOperationGradientClass GimpOperationGradientClass;
+
+struct _GimpOperationGradient
+{
+  GeglOperationFilter          parent_instance;
+
+  GimpContext                 *context;
+
+  GimpGradient                *gradient;
+  gdouble                      start_x, start_y, end_x, end_y;
+  GimpGradientType             gradient_type;
+  GimpRepeatMode               gradient_repeat;
+  gdouble                      offset;
+  gboolean                     gradient_reverse;
+  GimpGradientBlendColorSpace  gradient_blend_color_space;
+
+  gboolean                     supersample;
+  gint                         supersample_depth;
+  gdouble                      supersample_threshold;
+
+  gboolean                     dither;
+
+  GimpRGB                     *gradient_cache;
+  gint                         gradient_cache_size;
+  GMutex                       gradient_cache_mutex;
+};
+
+struct _GimpOperationGradientClass
+{
+  GeglOperationFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_gradient_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_GRADIENT_H__ */
diff --git a/app/operations/gimpoperationgrow.c b/app/operations/gimpoperationgrow.c
new file mode 100644
index 0000000..2aabcee
--- /dev/null
+++ b/app/operations/gimpoperationgrow.c
@@ -0,0 +1,391 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgrow.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationgrow.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_RADIUS_X,
+  PROP_RADIUS_Y
+};
+
+
+static void          gimp_operation_grow_get_property (GObject             *object,
+                                                       guint                property_id,
+                                                       GValue              *value,
+                                                       GParamSpec          *pspec);
+static void          gimp_operation_grow_set_property (GObject             *object,
+                                                       guint                property_id,
+                                                       const GValue        *value,
+                                                       GParamSpec          *pspec);
+
+static void          gimp_operation_grow_prepare      (GeglOperation       *operation);
+static GeglRectangle
+          gimp_operation_grow_get_required_for_output (GeglOperation       *self,
+                                                       const gchar         *input_pad,
+                                                       const GeglRectangle *roi);
+static GeglRectangle
+                gimp_operation_grow_get_cached_region (GeglOperation       *self,
+                                                       const GeglRectangle *roi);
+
+static gboolean gimp_operation_grow_process           (GeglOperation       *operation,
+                                                       GeglBuffer          *input,
+                                                       GeglBuffer          *output,
+                                                       const GeglRectangle *roi,
+                                                       gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationGrow, gimp_operation_grow,
+               GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_grow_parent_class
+
+
+static void
+gimp_operation_grow_class_init (GimpOperationGrowClass *klass)
+{
+  GObjectClass             *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationFilterClass *filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_grow_set_property;
+  object_class->get_property   = gimp_operation_grow_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:grow",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Grow operation",
+                                 NULL);
+
+  operation_class->prepare                 = gimp_operation_grow_prepare;
+  operation_class->get_required_for_output = gimp_operation_grow_get_required_for_output;
+  operation_class->get_cached_region       = gimp_operation_grow_get_cached_region;
+  operation_class->threaded                = FALSE;
+
+  filter_class->process                    = gimp_operation_grow_process;
+
+  g_object_class_install_property (object_class, PROP_RADIUS_X,
+                                   g_param_spec_int ("radius-x",
+                                                     "Radius X",
+                                                     "Grow radius in X direction",
+                                                     1, 2342, 1,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_RADIUS_Y,
+                                   g_param_spec_int ("radius-y",
+                                                     "Radius Y",
+                                                     "Grow radius in Y direction",
+                                                     1, 2342, 1,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_grow_init (GimpOperationGrow *self)
+{
+}
+
+static void
+gimp_operation_grow_get_property (GObject    *object,
+                                  guint       property_id,
+                                  GValue     *value,
+                                  GParamSpec *pspec)
+{
+ GimpOperationGrow *self = GIMP_OPERATION_GROW (object);
+
+  switch (property_id)
+    {
+    case PROP_RADIUS_X:
+      g_value_set_int (value, self->radius_x);
+      break;
+
+    case PROP_RADIUS_Y:
+      g_value_set_int (value, self->radius_y);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_grow_set_property (GObject      *object,
+                                  guint         property_id,
+                                  const GValue *value,
+                                  GParamSpec   *pspec)
+{
+  GimpOperationGrow *self = GIMP_OPERATION_GROW (object);
+
+  switch (property_id)
+    {
+    case PROP_RADIUS_X:
+      self->radius_x = g_value_get_int (value);
+      break;
+
+    case PROP_RADIUS_Y:
+      self->radius_y = g_value_get_int (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_grow_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("Y float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
+}
+
+static GeglRectangle
+gimp_operation_grow_get_required_for_output (GeglOperation       *self,
+                                             const gchar         *input_pad,
+                                             const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static GeglRectangle
+gimp_operation_grow_get_cached_region (GeglOperation       *self,
+                                       const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static void
+compute_border (gint16  *circ,
+                guint16  xradius,
+                guint16  yradius)
+{
+  gint32  i;
+  gint32  diameter = xradius * 2 + 1;
+  gdouble tmp;
+
+  for (i = 0; i < diameter; i++)
+    {
+      if (i > xradius)
+        tmp = (i - xradius) - 0.5;
+      else if (i < xradius)
+        tmp = (xradius - i) - 0.5;
+      else
+        tmp = 0.0;
+
+      circ[i] = RINT (yradius /
+                      (gdouble) xradius * sqrt (SQR (xradius) - SQR (tmp)));
+    }
+}
+
+static inline void
+rotate_pointers (gfloat  **p,
+                 guint32   n)
+{
+  guint32  i;
+  gfloat  *tmp;
+
+  tmp = p[0];
+
+  for (i = 0; i < n - 1; i++)
+    p[i] = p[i + 1];
+
+  p[i] = tmp;
+}
+
+static gboolean
+gimp_operation_grow_process (GeglOperation       *operation,
+                             GeglBuffer          *input,
+                             GeglBuffer          *output,
+                             const GeglRectangle *roi,
+                             gint                 level)
+{
+  /* Any bugs in this function are probably also in thin_region.
+   * Blame all bugs in this function on jaycox@gimp.org
+   */
+  GimpOperationGrow *self          = GIMP_OPERATION_GROW (operation);
+  const Babl        *input_format  = gegl_operation_get_format (operation, "input");
+  const Babl        *output_format = gegl_operation_get_format (operation, "output");
+  gint32             i, j, x, y;
+  gfloat           **buf;  /* caches the region's pixel data */
+  gfloat            *out;  /* holds the new scan line we are computing */
+  gfloat           **max;  /* caches the largest values for each column */
+  gint16            *circ; /* holds the y coords of the filter's mask */
+  gfloat             last_max;
+  gint16             last_index;
+  gfloat            *buffer;
+
+  max = g_new (gfloat *, roi->width + 2 * self->radius_x);
+  buf = g_new (gfloat *, self->radius_y + 1);
+
+  for (i = 0; i < self->radius_y + 1; i++)
+    buf[i] = g_new (gfloat, roi->width);
+
+  buffer = g_new (gfloat,
+                  (roi->width + 2 * self->radius_x) * (self->radius_y + 1));
+
+  for (i = 0; i < roi->width + 2 * self->radius_x; i++)
+    {
+      if (i < self->radius_x)
+        max[i] = buffer;
+      else if (i < roi->width + self->radius_x)
+        max[i] = &buffer[(self->radius_y + 1) * (i - self->radius_x)];
+      else
+        max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x - 1)];
+
+      for (j = 0; j < self->radius_y + 1; j++)
+        max[i][j] = 0.0;
+    }
+
+  /* offset the max pointer by self->radius_x so the range of the
+   * array is [-self->radius_x] to [roi->width + self->radius_x]
+   */
+  max += self->radius_x;
+
+  out =  g_new (gfloat, roi->width);
+
+  circ = g_new (gint16, 2 * self->radius_x + 1);
+  compute_border (circ, self->radius_x, self->radius_y);
+
+  /* offset the circ pointer by self->radius_x so the range of the
+   * array is [-self->radius_x] to [self->radius_x]
+   */
+  circ += self->radius_x;
+
+  memset (buf[0], 0, roi->width * sizeof (gfloat));
+
+  for (i = 0; i < self->radius_y && i < roi->height; i++) /* load top of image */
+    gegl_buffer_get (input,
+                     GEGL_RECTANGLE (roi->x, roi->y + i,
+                                     roi->width, 1),
+                     1.0, input_format, buf[i + 1],
+                     GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  for (x = 0; x < roi->width; x++) /* set up max for top of image */
+    {
+      max[x][0] = 0.0;       /* buf[0][x] is always 0 */
+      max[x][1] = buf[1][x]; /* MAX (buf[1][x], max[x][0]) always = buf[1][x]*/
+
+      for (j = 2; j < self->radius_y + 1; j++)
+        max[x][j] = MAX (buf[j][x], max[x][j - 1]);
+    }
+
+  for (y = 0; y < roi->height; y++)
+    {
+      rotate_pointers (buf, self->radius_y + 1);
+
+      if (y < roi->height - (self->radius_y))
+        gegl_buffer_get (input,
+                         GEGL_RECTANGLE (roi->x,  roi->y + y + self->radius_y,
+                                         roi->width, 1),
+                         1.0, input_format, buf[self->radius_y],
+                         GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+      else
+        memset (buf[self->radius_y], 0, roi->width * sizeof (gfloat));
+
+      for (x = 0; x < roi->width; x++) /* update max array */
+        {
+          for (i = self->radius_y; i > 0; i--)
+            max[x][i] = MAX (MAX (max[x][i - 1], buf[i - 1][x]), buf[i][x]);
+
+          max[x][0] = buf[0][x];
+        }
+
+      last_max = max[0][circ[-1]];
+      last_index = 1;
+
+      for (x = 0; x < roi->width; x++) /* render scan line */
+        {
+          last_index--;
+
+          if (last_index >= 0)
+            {
+              if (last_max >= 1.0)
+                {
+                  out[x] = 1.0;
+                }
+              else
+                {
+                  last_max = 0.0;
+
+                  for (i = self->radius_x; i >= 0; i--)
+                    if (last_max < max[x + i][circ[i]])
+                      {
+                        last_max = max[x + i][circ[i]];
+                        last_index = i;
+                      }
+
+                  out[x] = last_max;
+                }
+            }
+          else
+            {
+              last_index = self->radius_x;
+              last_max = max[x + self->radius_x][circ[self->radius_x]];
+
+              for (i = self->radius_x - 1; i >= -self->radius_x; i--)
+                if (last_max < max[x + i][circ[i]])
+                  {
+                    last_max = max[x + i][circ[i]];
+                    last_index = i;
+                  }
+
+              out[x] = last_max;
+            }
+        }
+
+      gegl_buffer_set (output,
+                       GEGL_RECTANGLE (roi->x, roi->y + y,
+                                       roi->width, 1),
+                       0, output_format, out,
+                       GEGL_AUTO_ROWSTRIDE);
+    }
+
+  /* undo the offsets to the pointers so we can free the malloced memory */
+  circ -= self->radius_x;
+  max -= self->radius_x;
+
+  g_free (circ);
+  g_free (buffer);
+  g_free (max);
+
+  for (i = 0; i < self->radius_y + 1; i++)
+    g_free (buf[i]);
+
+  g_free (buf);
+  g_free (out);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationgrow.h b/app/operations/gimpoperationgrow.h
new file mode 100644
index 0000000..d680997
--- /dev/null
+++ b/app/operations/gimpoperationgrow.h
@@ -0,0 +1,56 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgrow.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_GROW_H__
+#define __GIMP_OPERATION_GROW_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_GROW            (gimp_operation_grow_get_type ())
+#define GIMP_OPERATION_GROW(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_GROW, GimpOperationGrow))
+#define GIMP_OPERATION_GROW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_GROW, GimpOperationGrowClass))
+#define GIMP_IS_OPERATION_GROW(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_GROW))
+#define GIMP_IS_OPERATION_GROW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_GROW))
+#define GIMP_OPERATION_GROW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_GROW, GimpOperationGrowClass))
+
+
+typedef struct _GimpOperationGrow      GimpOperationGrow;
+typedef struct _GimpOperationGrowClass GimpOperationGrowClass;
+
+struct _GimpOperationGrow
+{
+  GeglOperationFilter  parent_instance;
+
+  gint                 radius_x;
+  gint                 radius_y;
+};
+
+struct _GimpOperationGrowClass
+{
+  GeglOperationFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_grow_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_GROW_H__ */
diff --git a/app/operations/gimpoperationhistogramsink.c b/app/operations/gimpoperationhistogramsink.c
new file mode 100644
index 0000000..cb0a7ac
--- /dev/null
+++ b/app/operations/gimpoperationhistogramsink.c
@@ -0,0 +1,244 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhistogramsink.c
+ * Copyright (C) 2012 Øyvind Kolås
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "operations-types.h"
+
+#include "core/gimphistogram.h"
+
+#include "gimpoperationhistogramsink.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_AUX,
+  PROP_HISTOGRAM
+};
+
+
+static void     gimp_operation_histogram_sink_finalize     (GObject             *object);
+static void     gimp_operation_histogram_sink_get_property (GObject             *object,
+                                                            guint                prop_id,
+                                                            GValue              *value,
+                                                            GParamSpec          *pspec);
+static void     gimp_operation_histogram_sink_set_property (GObject             *object,
+                                                            guint                prop_id,
+                                                            const GValue        *value,
+                                                            GParamSpec          *pspec);
+
+static void     gimp_operation_histogram_sink_attach       (GeglOperation       *operation);
+static void     gimp_operation_histogram_sink_prepare      (GeglOperation       *operation);
+static GeglRectangle
+     gimp_operation_histogram_sink_get_required_for_output (GeglOperation        *self,
+                                                            const gchar         *input_pad,
+                                                            const GeglRectangle *roi);
+static gboolean gimp_operation_histogram_sink_process      (GeglOperation       *operation,
+                                                            GeglOperationContext     *context,
+                                                            const gchar         *output_prop,
+                                                            const GeglRectangle *result,
+                                                            gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHistogramSink, gimp_operation_histogram_sink,
+               GEGL_TYPE_OPERATION_SINK)
+
+#define parent_class gimp_operation_histogram_sink_parent_class
+
+
+static void
+gimp_operation_histogram_sink_class_init (GimpOperationHistogramSinkClass *klass)
+{
+  GObjectClass       *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+
+  object_class->finalize     = gimp_operation_histogram_sink_finalize;
+  object_class->set_property = gimp_operation_histogram_sink_set_property;
+  object_class->get_property = gimp_operation_histogram_sink_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name"       , "gimp:histogram-sink",
+                                 "categories" , "color",
+                                 "description", "GIMP Histogram sink operation",
+                                 NULL);
+
+  operation_class->attach                  = gimp_operation_histogram_sink_attach;
+  operation_class->prepare                 = gimp_operation_histogram_sink_prepare;
+  operation_class->get_required_for_output = gimp_operation_histogram_sink_get_required_for_output;
+  operation_class->process                 = gimp_operation_histogram_sink_process;
+
+  g_object_class_install_property (object_class, PROP_AUX,
+                                   g_param_spec_object ("aux",
+                                                        "Aux",
+                                                        "Auxiliary image buffer input pad.",
+                                                        GEGL_TYPE_BUFFER,
+                                                        G_PARAM_READWRITE |
+                                                        GEGL_PARAM_PAD_INPUT));
+
+  g_object_class_install_property (object_class, PROP_HISTOGRAM,
+                                   g_param_spec_object ("histogram",
+                                                        "Histogram",
+                                                        "The result histogram",
+                                                        GIMP_TYPE_HISTOGRAM,
+                                                        G_PARAM_READWRITE));
+}
+
+static void
+gimp_operation_histogram_sink_init (GimpOperationHistogramSink *self)
+{
+}
+
+static void
+gimp_operation_histogram_sink_finalize (GObject *object)
+{
+  GimpOperationHistogramSink *sink = GIMP_OPERATION_HISTOGRAM_SINK (object);
+
+  g_clear_object (&sink->histogram);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_histogram_sink_get_property (GObject    *object,
+                                            guint       prop_id,
+                                            GValue     *value,
+                                            GParamSpec *pspec)
+{
+  GimpOperationHistogramSink *sink = GIMP_OPERATION_HISTOGRAM_SINK (object);
+
+  switch (prop_id)
+    {
+    case PROP_AUX:
+      break;
+
+    case PROP_HISTOGRAM:
+      g_value_set_pointer (value, sink->histogram);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_histogram_sink_set_property (GObject      *object,
+                                            guint         prop_id,
+                                            const GValue *value,
+                                            GParamSpec   *pspec)
+{
+  GimpOperationHistogramSink *sink = GIMP_OPERATION_HISTOGRAM_SINK (object);
+
+  switch (prop_id)
+    {
+    case PROP_AUX:
+      break;
+
+    case PROP_HISTOGRAM:
+      if (sink->histogram)
+        g_object_unref (sink->histogram);
+      sink->histogram = g_value_dup_object (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_histogram_sink_attach (GeglOperation *self)
+{
+  GeglOperation *operation    = GEGL_OPERATION (self);
+  GObjectClass  *object_class = G_OBJECT_GET_CLASS (self);
+
+  GEGL_OPERATION_CLASS (parent_class)->attach (self);
+
+  gegl_operation_create_pad (operation,
+                             g_object_class_find_property (object_class,
+                                                           "aux"));
+}
+
+static void
+gimp_operation_histogram_sink_prepare (GeglOperation *operation)
+{
+  /* XXX gegl_operation_set_format (operation, "input", babl_format ("Y u8")); */
+  gegl_operation_set_format (operation, "aux",   babl_format ("Y float"));
+}
+
+static GeglRectangle
+gimp_operation_histogram_sink_get_required_for_output (GeglOperation       *self,
+                                                       const gchar         *input_pad,
+                                                       const GeglRectangle *roi)
+{
+  /* dunno what to do here, make a wild guess */
+  return *roi;
+}
+
+static gboolean
+gimp_operation_histogram_sink_process (GeglOperation        *operation,
+                                       GeglOperationContext *context,
+                                       const gchar          *output_prop,
+                                       const GeglRectangle  *result,
+                                       gint                  level)
+{
+  GeglBuffer *input;
+  GeglBuffer *aux;
+
+  if (strcmp (output_prop, "output"))
+    {
+      g_warning ("requested processing of %s pad on a sink", output_prop);
+      return FALSE;
+    }
+
+  input = (GeglBuffer*) gegl_operation_context_dup_object (context, "input");
+  aux   = (GeglBuffer*) gegl_operation_context_dup_object (context, "aux");
+
+  if (! input)
+    {
+      g_warning ("received NULL input");
+
+      return FALSE;
+    }
+
+  if (aux)
+    {
+      /* do hist with mask */
+
+      g_printerr ("aux format: %s\n",
+                  babl_get_name (gegl_buffer_get_format (aux)));
+
+      g_object_unref (aux);
+    }
+  else
+    {
+      /* without */
+    }
+
+  g_printerr ("input format: %s\n",
+              babl_get_name (gegl_buffer_get_format (input)));
+
+  g_object_unref (input);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationhistogramsink.h b/app/operations/gimpoperationhistogramsink.h
new file mode 100644
index 0000000..719719c
--- /dev/null
+++ b/app/operations/gimpoperationhistogramsink.h
@@ -0,0 +1,56 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhistogramsink.h
+ * Copyright (C) 2012 Øyvind Kolås
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HISTOGRAM_SINK_H__
+#define __GIMP_OPERATION_HISTOGRAM_SINK_H__
+
+
+#include <gegl-plugin.h>
+#include <operation/gegl-operation-sink.h>
+
+
+#define GIMP_TYPE_OPERATION_HISTOGRAM_SINK            (gimp_operation_histogram_sink_get_type ())
+#define GIMP_OPERATION_HISTOGRAM_SINK(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HISTOGRAM_SINK, GimpOperationHistogramSink))
+#define GIMP_OPERATION_HISTOGRAM_SINK_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HISTOGRAM_SINK, GimpOperationHistogramSinkClass))
+#define GEGL_IS_OPERATION_HISTOGRAM_SINK(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HISTOGRAM_SINK))
+#define GEGL_IS_OPERATION_HISTOGRAM_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HISTOGRAM_SINK))
+#define GIMP_OPERATION_HISTOGRAM_SINK_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HISTOGRAM_SINK, GimpOperationHistogramSinkClass))
+
+
+typedef struct _GimpOperationHistogramSink      GimpOperationHistogramSink;
+typedef struct _GimpOperationHistogramSinkClass GimpOperationHistogramSinkClass;
+
+struct _GimpOperationHistogramSink
+{
+  GeglOperation  parent_instance;
+
+  GimpHistogram *histogram;
+};
+
+struct _GimpOperationHistogramSinkClass
+{
+  GeglOperationSinkClass  parent_class;
+};
+
+
+GType   gimp_operation_histogram_sink_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_HISTOGRAM_SINK_C__ */
diff --git a/app/operations/gimpoperationhuesaturation.c b/app/operations/gimpoperationhuesaturation.c
new file mode 100644
index 0000000..cdfb7d7
--- /dev/null
+++ b/app/operations/gimpoperationhuesaturation.c
@@ -0,0 +1,302 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhuesaturation.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimphuesaturationconfig.h"
+#include "gimpoperationhuesaturation.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_hue_saturation_process (GeglOperation       *operation,
+                                                       void                *in_buf,
+                                                       void                *out_buf,
+                                                       glong                samples,
+                                                       const GeglRectangle *roi,
+                                                       gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHueSaturation, gimp_operation_hue_saturation,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_hue_saturation_parent_class
+
+
+static void
+gimp_operation_hue_saturation_class_init (GimpOperationHueSaturationClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_point_filter_set_property;
+  object_class->get_property   = gimp_operation_point_filter_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:hue-saturation",
+                                 "categories",  "color",
+                                 "description", _("Adjust hue, saturation, and lightness"),
+                                 NULL);
+
+  point_class->process = gimp_operation_hue_saturation_process;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "The config object",
+                                                        GIMP_TYPE_HUE_SATURATION_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_hue_saturation_init (GimpOperationHueSaturation *self)
+{
+}
+
+static inline gdouble
+map_hue (GimpHueSaturationConfig *config,
+         GimpHueRange             range,
+         gdouble                  value)
+{
+  value += (config->hue[GIMP_HUE_RANGE_ALL] + config->hue[range]) / 2.0;
+
+  if (value < 0)
+    return value + 1.0;
+  else if (value > 1.0)
+    return value - 1.0;
+  else
+    return value;
+}
+
+static inline gdouble
+map_hue_overlap (GimpHueSaturationConfig *config,
+                 GimpHueRange             primary_range,
+                 GimpHueRange             secondary_range,
+                 gdouble                  value,
+                 gdouble                  primary_intensity,
+                 gdouble                  secondary_intensity)
+{
+  /*  When calculating an overlap between two ranges, interpolate the
+   *  hue adjustment from config->hue[primary_range] and
+   *  config->hue[secondary_range] BEFORE mapping it to the input
+   *  value.  This fixes odd edge cases where only one of the ranges
+   *  crosses the red/magenta wraparound (bug #527085), or if
+   *  adjustments to different channels yield more than 180 degree
+   *  difference from each other. (Why anyone would do that is beyond
+   *  me, but still.)
+   *
+   *  See bugs #527085 and #644032 for examples of such cases.
+   */
+  gdouble v = config->hue[primary_range]   * primary_intensity +
+              config->hue[secondary_range] * secondary_intensity;
+
+  value += (config->hue[GIMP_HUE_RANGE_ALL] + v) / 2.0;
+
+  if (value < 0)
+    return value + 1.0;
+  else if (value > 1.0)
+    return value - 1.0;
+  else
+    return value;
+}
+
+static inline gdouble
+map_saturation (GimpHueSaturationConfig *config,
+                GimpHueRange             range,
+                gdouble                  value)
+{
+  gdouble v = config->saturation[GIMP_HUE_RANGE_ALL] + config->saturation[range];
+
+  /* This change affects the way saturation is computed. With the old
+   * code (different code for value < 0), increasing the saturation
+   * affected muted colors very much, and bright colors less. With the
+   * new code, it affects muted colors and bright colors more or less
+   * evenly. For enhancing the color in photos, the new behavior is
+   * exactly what you want. It's hard for me to imagine a case in
+   * which the old behavior is better.
+  */
+  value *= (v + 1.0);
+
+  return CLAMP (value, 0.0, 1.0);
+}
+
+static inline gdouble
+map_lightness (GimpHueSaturationConfig *config,
+               GimpHueRange             range,
+               gdouble                  value)
+{
+  gdouble v = (config->lightness[GIMP_HUE_RANGE_ALL] + config->lightness[range]) / 2.0;
+
+  if (v < 0)
+    return value * (v + 1.0);
+  else
+    return value + (v * (1.0 - value));
+}
+
+static gboolean
+gimp_operation_hue_saturation_process (GeglOperation       *operation,
+                                       void                *in_buf,
+                                       void                *out_buf,
+                                       glong                samples,
+                                       const GeglRectangle *roi,
+                                       gint                 level)
+{
+  GimpOperationPointFilter *point  = GIMP_OPERATION_POINT_FILTER (operation);
+  GimpHueSaturationConfig  *config = GIMP_HUE_SATURATION_CONFIG (point->config);
+  gfloat                   *src    = in_buf;
+  gfloat                   *dest   = out_buf;
+  gfloat                    overlap;
+
+  if (! config)
+    return FALSE;
+
+  overlap = config->overlap / 2.0;
+
+  while (samples--)
+    {
+      GimpRGB  rgb;
+      GimpHSL  hsl;
+      gdouble  h;
+      gint     hue_counter;
+      gint     hue                 = 0;
+      gint     secondary_hue       = 0;
+      gboolean use_secondary_hue   = FALSE;
+      gfloat   primary_intensity   = 0.0;
+      gfloat   secondary_intensity = 0.0;
+
+      rgb.r = src[RED];
+      rgb.g = src[GREEN];
+      rgb.b = src[BLUE];
+      rgb.a = src[ALPHA];
+
+      gimp_rgb_to_hsl (&rgb, &hsl);
+
+      h = hsl.h * 6.0;
+
+      for (hue_counter = 0; hue_counter < 7; hue_counter++)
+        {
+          gdouble hue_threshold = (gdouble) hue_counter + 0.5;
+
+          if (h < ((gdouble) hue_threshold + overlap))
+            {
+              hue = hue_counter;
+
+              if (overlap > 0.0 && h > ((gdouble) hue_threshold - overlap))
+                {
+                  use_secondary_hue = TRUE;
+
+                  secondary_hue = hue_counter + 1;
+
+                  secondary_intensity =
+                    (h - (gdouble) hue_threshold + overlap) / (2.0 * overlap);
+
+                  primary_intensity = 1.0 - secondary_intensity;
+                }
+              else
+                {
+                  use_secondary_hue = FALSE;
+                }
+
+              break;
+            }
+        }
+
+      if (hue >= 6)
+        {
+          hue = 0;
+          use_secondary_hue = FALSE;
+        }
+
+      if (secondary_hue >= 6)
+        {
+          secondary_hue = 0;
+        }
+
+      /*  transform into GimpHueRange values  */
+      hue++;
+      secondary_hue++;
+
+      if (use_secondary_hue)
+        {
+          hsl.h = map_hue_overlap (config, hue, secondary_hue, hsl.h,
+                                   primary_intensity, secondary_intensity);
+
+          hsl.s = (map_saturation (config, hue,           hsl.s) * primary_intensity +
+                   map_saturation (config, secondary_hue, hsl.s) * secondary_intensity);
+
+          hsl.l = (map_lightness (config, hue,           hsl.l) * primary_intensity +
+                   map_lightness (config, secondary_hue, hsl.l) * secondary_intensity);
+        }
+      else
+        {
+          hsl.h = map_hue        (config, hue, hsl.h);
+          hsl.s = map_saturation (config, hue, hsl.s);
+          hsl.l = map_lightness  (config, hue, hsl.l);
+        }
+
+      gimp_hsl_to_rgb (&hsl, &rgb);
+
+      dest[RED]   = rgb.r;
+      dest[GREEN] = rgb.g;
+      dest[BLUE]  = rgb.b;
+      dest[ALPHA] = rgb.a;
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+void
+gimp_operation_hue_saturation_map (GimpHueSaturationConfig *config,
+                                   const GimpRGB           *color,
+                                   GimpHueRange             range,
+                                   GimpRGB                 *result)
+{
+  GimpHSL hsl;
+
+  g_return_if_fail (GIMP_IS_HUE_SATURATION_CONFIG (config));
+  g_return_if_fail (color != NULL);
+  g_return_if_fail (result != NULL);
+
+  gimp_rgb_to_hsl (color, &hsl);
+
+  hsl.h = map_hue        (config, range, hsl.h);
+  hsl.s = map_saturation (config, range, hsl.s);
+  hsl.l = map_lightness  (config, range, hsl.l);
+
+  gimp_hsl_to_rgb (&hsl, result);
+}
diff --git a/app/operations/gimpoperationhuesaturation.h b/app/operations/gimpoperationhuesaturation.h
new file mode 100644
index 0000000..b084bbe
--- /dev/null
+++ b/app/operations/gimpoperationhuesaturation.h
@@ -0,0 +1,58 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhuesaturation.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HUE_SATURATION_H__
+#define __GIMP_OPERATION_HUE_SATURATION_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_HUE_SATURATION            (gimp_operation_hue_saturation_get_type ())
+#define GIMP_OPERATION_HUE_SATURATION(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HUE_SATURATION, GimpOperationHueSaturation))
+#define GIMP_OPERATION_HUE_SATURATION_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HUE_SATURATION, GimpOperationHueSaturationClass))
+#define GIMP_IS_OPERATION_HUE_SATURATION(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HUE_SATURATION))
+#define GIMP_IS_OPERATION_HUE_SATURATION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HUE_SATURATION))
+#define GIMP_OPERATION_HUE_SATURATION_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HUE_SATURATION, GimpOperationHueSaturationClass))
+
+
+typedef struct _GimpOperationHueSaturation      GimpOperationHueSaturation;
+typedef struct _GimpOperationHueSaturationClass GimpOperationHueSaturationClass;
+
+struct _GimpOperationHueSaturation
+{
+  GimpOperationPointFilter  parent_instance;
+};
+
+struct _GimpOperationHueSaturationClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_hue_saturation_get_type (void) G_GNUC_CONST;
+
+void    gimp_operation_hue_saturation_map      (GimpHueSaturationConfig *config,
+                                                const GimpRGB           *color,
+                                                GimpHueRange             range,
+                                                GimpRGB                 *result);
+
+
+#endif /* __GIMP_OPERATION_HUE_SATURATION_H__ */
diff --git a/app/operations/gimpoperationlevels.c b/app/operations/gimpoperationlevels.c
new file mode 100644
index 0000000..1bf0b06
--- /dev/null
+++ b/app/operations/gimpoperationlevels.c
@@ -0,0 +1,208 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlevels.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimplevelsconfig.h"
+#include "gimpoperationlevels.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_levels_process (GeglOperation       *operation,
+                                               void                *in_buf,
+                                               void                *out_buf,
+                                               glong                samples,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationLevels, gimp_operation_levels,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_levels_parent_class
+
+
+static void
+gimp_operation_levels_class_init (GimpOperationLevelsClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_point_filter_set_property;
+  object_class->get_property   = gimp_operation_point_filter_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:levels",
+                                 "categories",  "color",
+                                 "description", _("Adjust color levels"),
+                                 NULL);
+
+  point_class->process = gimp_operation_levels_process;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_LINEAR,
+                                   g_param_spec_boolean ("linear",
+                                                         "Linear",
+                                                         "Whether to operate on linear RGB",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "The config object",
+                                                        GIMP_TYPE_LEVELS_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_levels_init (GimpOperationLevels *self)
+{
+}
+
+static inline gdouble
+gimp_operation_levels_map (gdouble  value,
+                           gdouble  low_input,
+                           gdouble  high_input,
+                           gboolean clamp_input,
+                           gdouble  inv_gamma,
+                           gdouble  low_output,
+                           gdouble  high_output,
+                           gboolean clamp_output)
+{
+  /*  determine input intensity  */
+  if (high_input != low_input)
+    value = (value - low_input) / (high_input - low_input);
+  else
+    value = (value - low_input);
+
+  if (clamp_input)
+    value = CLAMP (value, 0.0, 1.0);
+
+  if (inv_gamma != 1.0 && value > 0)
+    value =  pow (value, inv_gamma);
+
+  /*  determine the output intensity  */
+  if (high_output >= low_output)
+    value = value * (high_output - low_output) + low_output;
+  else if (high_output < low_output)
+    value = low_output - value * (low_output - high_output);
+
+  if (clamp_output)
+    value = CLAMP (value, 0.0, 1.0);
+
+  return value;
+}
+
+static gboolean
+gimp_operation_levels_process (GeglOperation       *operation,
+                               void                *in_buf,
+                               void                *out_buf,
+                               glong                samples,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  GimpOperationPointFilter *point  = GIMP_OPERATION_POINT_FILTER (operation);
+  GimpLevelsConfig         *config = GIMP_LEVELS_CONFIG (point->config);
+  gfloat                   *src    = in_buf;
+  gfloat                   *dest   = out_buf;
+  gfloat                    inv_gamma[5];
+  gint                      channel;
+
+  if (! config)
+    return FALSE;
+
+  for (channel = 0; channel < 5; channel++)
+    {
+      g_return_val_if_fail (config->gamma[channel] != 0.0, FALSE);
+
+      inv_gamma[channel] = 1.0 / config->gamma[channel];
+    }
+
+  while (samples--)
+    {
+      for (channel = 0; channel < 4; channel++)
+        {
+          gdouble value;
+
+          value = gimp_operation_levels_map (src[channel],
+                                             config->low_input[channel + 1],
+                                             config->high_input[channel + 1],
+                                             config->clamp_input,
+                                             inv_gamma[channel + 1],
+                                             config->low_output[channel + 1],
+                                             config->high_output[channel + 1],
+                                             config->clamp_output);
+
+          /* don't apply the overall curve to the alpha channel */
+          if (channel != ALPHA)
+            value = gimp_operation_levels_map (value,
+                                               config->low_input[0],
+                                               config->high_input[0],
+                                               config->clamp_input,
+                                               inv_gamma[0],
+                                               config->low_output[0],
+                                               config->high_output[0],
+                                               config->clamp_output);
+
+          dest[channel] = value;
+        }
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+gdouble
+gimp_operation_levels_map_input (GimpLevelsConfig     *config,
+                                 GimpHistogramChannel  channel,
+                                 gdouble               value)
+{
+  g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), 0.0);
+
+  /*  determine input intensity  */
+  if (config->high_input[channel] != config->low_input[channel])
+    value = ((value - config->low_input[channel]) /
+             (config->high_input[channel] - config->low_input[channel]));
+  else
+    value = (value - config->low_input[channel]);
+
+  if (config->gamma[channel] != 0.0 && value > 0.0)
+    value = pow (value, 1.0 / config->gamma[channel]);
+
+  return value;
+}
diff --git a/app/operations/gimpoperationlevels.h b/app/operations/gimpoperationlevels.h
new file mode 100644
index 0000000..d977f42
--- /dev/null
+++ b/app/operations/gimpoperationlevels.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlevels.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_LEVELS_H__
+#define __GIMP_OPERATION_LEVELS_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_LEVELS            (gimp_operation_levels_get_type ())
+#define GIMP_OPERATION_LEVELS(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_LEVELS, GimpOperationLevels))
+#define GIMP_OPERATION_LEVELS_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_LEVELS, GimpOperationLevelsClass))
+#define GIMP_IS_OPERATION_LEVELS(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_LEVELS))
+#define GIMP_IS_OPERATION_LEVELS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_LEVELS))
+#define GIMP_OPERATION_LEVELS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_LEVELS, GimpOperationLevelsClass))
+
+
+typedef struct _GimpOperationLevels      GimpOperationLevels;
+typedef struct _GimpOperationLevelsClass GimpOperationLevelsClass;
+
+struct _GimpOperationLevels
+{
+  GimpOperationPointFilter  parent_instance;
+};
+
+struct _GimpOperationLevelsClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType     gimp_operation_levels_get_type  (void) G_GNUC_CONST;
+
+gdouble   gimp_operation_levels_map_input (GimpLevelsConfig     *config,
+                                           GimpHistogramChannel  channel,
+                                           gdouble               value);
+
+
+#endif /* __GIMP_OPERATION_LEVELS_H__ */
diff --git a/app/operations/gimpoperationmaskcomponents.cc b/app/operations/gimpoperationmaskcomponents.cc
new file mode 100644
index 0000000..779dfac
--- /dev/null
+++ b/app/operations/gimpoperationmaskcomponents.cc
@@ -0,0 +1,586 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationmaskcomponents.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+extern "C"
+{
+
+#include "operations-types.h"
+
+#include "gimpoperationmaskcomponents.h"
+
+} /* extern "C" */
+
+
+enum
+{
+  PROP_0,
+  PROP_MASK,
+  PROP_ALPHA
+};
+
+
+static void            gimp_operation_mask_components_get_property     (GObject             *object,
+                                                                        guint                property_id,
+                                                                        GValue              *value,
+                                                                        GParamSpec          *pspec);
+static void            gimp_operation_mask_components_set_property     (GObject             *object,
+                                                                        guint                property_id,
+                                                                        const GValue        *value,
+                                                                        GParamSpec          *pspec);
+
+static void            gimp_operation_mask_components_prepare          (GeglOperation       *operation);
+static GeglRectangle   gimp_operation_mask_components_get_bounding_box (GeglOperation       *operation);
+static gboolean        gimp_operation_mask_components_parent_process   (GeglOperation        *operation,
+                                                                        GeglOperationContext *context,
+                                                                        const gchar          *output_prop,
+                                                                        const GeglRectangle  *result,
+                                                                        gint                  level);
+
+static gboolean        gimp_operation_mask_components_process          (GeglOperation       *operation,
+                                                                        void                *in_buf,
+                                                                        void                *aux_buf,
+                                                                        void                *out_buf,
+                                                                        glong                samples,
+                                                                        const GeglRectangle *roi,
+                                                                        gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationMaskComponents, gimp_operation_mask_components,
+               GEGL_TYPE_OPERATION_POINT_COMPOSER)
+
+#define parent_class gimp_operation_mask_components_parent_class
+
+
+static void
+gimp_operation_mask_components_class_init (GimpOperationMaskComponentsClass *klass)
+{
+  GObjectClass                    *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass              *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointComposerClass *point_class     = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_mask_components_set_property;
+  object_class->get_property = gimp_operation_mask_components_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:mask-components",
+                                 "categories",  "gimp",
+                                 "description", "Selectively pick components from src or aux",
+                                 NULL);
+
+  operation_class->prepare          = gimp_operation_mask_components_prepare;
+  operation_class->get_bounding_box = gimp_operation_mask_components_get_bounding_box;
+  operation_class->process          = gimp_operation_mask_components_parent_process;
+
+  point_class->process              = gimp_operation_mask_components_process;
+
+  g_object_class_install_property (object_class, PROP_MASK,
+                                   g_param_spec_flags ("mask",
+                                                       "Mask",
+                                                       "The component mask",
+                                                       GIMP_TYPE_COMPONENT_MASK,
+                                                       GIMP_COMPONENT_MASK_ALL,
+                                                       (GParamFlags) (
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT)));
+
+  g_object_class_install_property (object_class, PROP_ALPHA,
+                                   g_param_spec_double ("alpha",
+                                                        "Alpha",
+                                                        "The masked-in alpha value when there's no aux input",
+                                                        -G_MAXDOUBLE,
+                                                        G_MAXDOUBLE,
+                                                        0.0,
+                                                        (GParamFlags) (
+                                                          G_PARAM_READWRITE |
+                                                          G_PARAM_CONSTRUCT)));
+}
+
+static void
+gimp_operation_mask_components_init (GimpOperationMaskComponents *self)
+{
+}
+
+static void
+gimp_operation_mask_components_get_property (GObject    *object,
+                                             guint       property_id,
+                                             GValue     *value,
+                                             GParamSpec *pspec)
+{
+  GimpOperationMaskComponents *self = GIMP_OPERATION_MASK_COMPONENTS (object);
+
+  switch (property_id)
+    {
+    case PROP_MASK:
+      g_value_set_flags (value, self->mask);
+      break;
+
+    case PROP_ALPHA:
+      g_value_set_double (value, self->alpha);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_mask_components_set_property (GObject      *object,
+                                             guint         property_id,
+                                             const GValue *value,
+                                             GParamSpec   *pspec)
+{
+  GimpOperationMaskComponents *self = GIMP_OPERATION_MASK_COMPONENTS (object);
+
+  switch (property_id)
+    {
+    case PROP_MASK:
+      self->mask = (GimpComponentMask) g_value_get_flags (value);
+      break;
+
+    case PROP_ALPHA:
+      self->alpha = g_value_get_double (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static guint32
+get_alpha_value (const Babl *format,
+                 gfloat      alpha)
+{
+  switch (babl_format_get_bytes_per_pixel (format))
+    {
+    #define DEF_CASE(bpp, type)                                            \
+      case bpp:                                                            \
+      {                                                                    \
+        type alpha_value;                                                  \
+                                                                           \
+        babl_process (                                                     \
+          babl_fish (babl_format_n (babl_type ("float"),              1),  \
+                     babl_format_n (babl_format_get_type (format, 0), 1)), \
+          &alpha, &alpha_value, 1);                                        \
+                                                                           \
+        return alpha_value;                                                \
+      }
+
+    DEF_CASE ( 4, guint8)
+    DEF_CASE ( 8, guint16)
+    DEF_CASE (16, guint32)
+
+    #undef DEF_CASE
+
+    default:
+      g_return_val_if_reached (0);
+    }
+}
+
+template <class T>
+struct ProcessGeneric
+{
+  static void
+  process (gconstpointer     in_buf,
+           gconstpointer     aux_buf,
+           gpointer          out_buf,
+           gint              n,
+           GimpComponentMask mask,
+           T                 alpha_value)
+  {
+    T    *out = (T *) out_buf;
+    gint  i;
+    gint  c;
+
+    if (aux_buf)
+      {
+        const T *in[4];
+
+        for (c = 0; c < 4; c++)
+          {
+            if (mask & (1 << c))
+              in[c] = (const T *) aux_buf + c;
+            else
+              in[c] = (const T *) in_buf  + c;
+          }
+
+        for (i = 0; i < n; i++)
+          {
+            for (c = 0; c < 4; c++)
+              {
+                out[c] = *in[c];
+
+                in[c] += 4;
+              }
+
+            out += 4;
+          }
+      }
+    else
+      {
+        const T *in = (const T*) in_buf;
+
+        for (i = 0; i < n; i++)
+          {
+            for (c = 0; c < 3; c++)
+              {
+                if (mask & (1 << c))
+                  out[c] = 0;
+                else
+                  out[c] = in[c];
+              }
+
+            if (mask & (1 << 3))
+              out[3] = alpha_value;
+            else
+              out[3] = in[3];
+
+            in  += 4;
+            out += 4;
+          }
+      }
+  }
+};
+
+template <class T>
+struct Process : ProcessGeneric<T>
+{
+};
+
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+
+template <>
+struct Process<guint8>
+{
+  static void
+  process (gconstpointer     in_buf,
+           gconstpointer     aux_buf,
+           gpointer          out_buf,
+           gint              n,
+           GimpComponentMask mask,
+           guint8            alpha_value)
+  {
+    const guint32 *in;
+    guint32       *out;
+    guint32        in_mask = 0;
+    gint           i;
+    gint           c;
+
+    if (((guintptr) in_buf | (guintptr) aux_buf | (guintptr) out_buf) % 4)
+      {
+        ProcessGeneric<guint8>::process (in_buf, aux_buf, out_buf, n,
+                                         mask, alpha_value);
+
+        return;
+      }
+
+    in  = (const guint32 *) in_buf;
+    out = (guint32       *) out_buf;
+
+    for (c = 0; c < 4; c++)
+      {
+        if (! (mask & (1 << c)))
+          in_mask |= 0xff << (8 * c);
+      }
+
+    if (aux_buf)
+      {
+        const guint32 *aux      = (const guint32 *) aux_buf;
+        guint32        aux_mask = ~in_mask;
+
+        for (i = 0; i < n; i++)
+          {
+            *out = (*in & in_mask) | (*aux & aux_mask);
+
+            in++;
+            aux++;
+            out++;
+          }
+      }
+    else
+      {
+        if (! (mask & GIMP_COMPONENT_MASK_ALPHA) || ! alpha_value)
+          {
+            for (i = 0; i < n; i++)
+              {
+                *out = *in & in_mask;
+
+                in++;
+                out++;
+              }
+          }
+        else
+          {
+            guint32 alpha_mask = alpha_value << 24;
+
+            for (i = 0; i < n; i++)
+              {
+                *out = (*in & in_mask) | alpha_mask;
+
+                in++;
+                out++;
+              }
+          }
+      }
+  }
+};
+
+#endif /* G_BYTE_ORDER == G_LITTLE_ENDIAN */
+
+template <class T>
+static gboolean
+gimp_operation_mask_components_process (GimpOperationMaskComponents *self,
+                                        void                        *in_buf,
+                                        void                        *aux_buf,
+                                        void                        *out_buf,
+                                        glong                        samples,
+                                        const GeglRectangle         *roi,
+                                        gint                         level)
+{
+  Process<T>::process (in_buf, aux_buf, out_buf, samples,
+                       self->mask, self->alpha_value);
+
+  return TRUE;
+}
+
+static void
+gimp_operation_mask_components_prepare (GeglOperation *operation)
+{
+  GimpOperationMaskComponents *self = GIMP_OPERATION_MASK_COMPONENTS (operation);
+  const Babl                  *format;
+
+  format = gimp_operation_mask_components_get_format (
+    gegl_operation_get_source_format (operation, "input"));
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "aux",    format);
+  gegl_operation_set_format (operation, "output", format);
+
+  if (format != self->format)
+    {
+      self->format = format;
+
+      self->alpha_value = get_alpha_value (format, self->alpha);
+
+      switch (babl_format_get_bytes_per_pixel (format))
+        {
+        case 4:
+          self->process = (gpointer)
+                            gimp_operation_mask_components_process<guint8>;
+          break;
+
+        case 8:
+          self->process = (gpointer)
+                            gimp_operation_mask_components_process<guint16>;
+          break;
+
+        case 16:
+          self->process = (gpointer)
+                            gimp_operation_mask_components_process<guint32>;
+          break;
+
+        default:
+          g_return_if_reached ();
+        }
+    }
+}
+
+static GeglRectangle
+gimp_operation_mask_components_get_bounding_box (GeglOperation *operation)
+{
+  GimpOperationMaskComponents *self = GIMP_OPERATION_MASK_COMPONENTS (operation);
+  GeglRectangle               *in_rect;
+  GeglRectangle               *aux_rect;
+  GeglRectangle                result = {};
+
+  in_rect  = gegl_operation_source_get_bounding_box (operation, "input");
+  aux_rect = gegl_operation_source_get_bounding_box (operation, "aux");
+
+  if (self->mask == 0)
+    {
+      if (in_rect)
+        return *in_rect;
+    }
+  else if (self->mask == GIMP_COMPONENT_MASK_ALL)
+    {
+      if (aux_rect)
+        return *aux_rect;
+    }
+
+  if (in_rect)
+    gegl_rectangle_bounding_box (&result, &result, in_rect);
+
+  if (aux_rect)
+    gegl_rectangle_bounding_box (&result, &result, aux_rect);
+
+  return result;
+}
+
+static gboolean
+gimp_operation_mask_components_parent_process (GeglOperation        *operation,
+                                               GeglOperationContext *context,
+                                               const gchar          *output_prop,
+                                               const GeglRectangle  *result,
+                                               gint                  level)
+{
+  GimpOperationMaskComponents *self = GIMP_OPERATION_MASK_COMPONENTS (operation);
+
+  if (self->mask == 0)
+    {
+      GObject *input = gegl_operation_context_get_object (context, "input");
+
+      gegl_operation_context_set_object (context, "output", input);
+
+      return TRUE;
+    }
+  else if (self->mask == GIMP_COMPONENT_MASK_ALL)
+    {
+      GObject *aux = gegl_operation_context_get_object (context, "aux");
+
+      /* when there's no aux and the alpha component is masked-in, we set the
+       * result's alpha component to the value of the "alpha" property; if it
+       * doesn't equal 0, we can't forward an empty aux.
+       */
+      if (aux || ! self->alpha_value)
+        {
+          gegl_operation_context_set_object (context, "output", aux);
+
+          return TRUE;
+        }
+    }
+
+  return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
+                                                       output_prop, result,
+                                                       level);
+}
+
+static gboolean
+gimp_operation_mask_components_process (GeglOperation       *operation,
+                                        void                *in_buf,
+                                        void                *aux_buf,
+                                        void                *out_buf,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  typedef gboolean (* ProcessFunc) (GimpOperationMaskComponents *self,
+                                    void                        *in_buf,
+                                    void                        *aux_buf,
+                                    void                        *out_buf,
+                                    glong                        samples,
+                                    const GeglRectangle         *roi,
+                                    gint                         level);
+
+  GimpOperationMaskComponents *self = (GimpOperationMaskComponents *) operation;
+
+  return ((ProcessFunc) self->process) (self,
+                                        in_buf, aux_buf, out_buf, samples,
+                                        roi, level);
+}
+
+const Babl *
+gimp_operation_mask_components_get_format (const Babl *input_format)
+{
+  const Babl *format = NULL;
+
+  if (input_format)
+    {
+      const Babl  *model      = babl_format_get_model (input_format);
+      const gchar *model_name = babl_get_name (model);
+      const Babl  *type       = babl_format_get_type (input_format, 0);
+      const gchar *type_name  = babl_get_name (type);
+
+      if (! strcmp (model_name, "Y")   ||
+          ! strcmp (model_name, "YA")  ||
+          ! strcmp (model_name, "RGB") ||
+          ! strcmp (model_name, "RGBA"))
+        {
+          if (! strcmp (type_name, "u8"))
+            format = babl_format ("RGBA u8");
+          else if (! strcmp (type_name, "u16"))
+            format = babl_format ("RGBA u16");
+          else if (! strcmp (type_name, "u32"))
+            format = babl_format ("RGBA u32");
+          else if (! strcmp (type_name, "half"))
+            format = babl_format ("RGBA half");
+          else if (! strcmp (type_name, "float"))
+            format = babl_format ("RGBA float");
+        }
+      else if (! strcmp (model_name, "Y'")      ||
+               ! strcmp (model_name, "Y'A")     ||
+               ! strcmp (model_name, "R'G'B'")  ||
+               ! strcmp (model_name, "R'G'B'A") ||
+               babl_format_is_palette (input_format))
+        {
+          if (! strcmp (type_name, "u8"))
+            format = babl_format ("R'G'B'A u8");
+          else if (! strcmp (type_name, "u16"))
+            format = babl_format ("R'G'B'A u16");
+          else if (! strcmp (type_name, "u32"))
+            format = babl_format ("R'G'B'A u32");
+          else if (! strcmp (type_name, "half"))
+            format = babl_format ("R'G'B'A half");
+          else if (! strcmp (type_name, "float"))
+            format = babl_format ("R'G'B'A float");
+        }
+    }
+
+  if (! format)
+    format = babl_format ("RGBA float");
+
+  return format;
+}
+
+void
+gimp_operation_mask_components_process (const Babl        *format,
+                                        gconstpointer      in,
+                                        gconstpointer      aux,
+                                        gpointer           out,
+                                        gint               n,
+                                        GimpComponentMask  mask)
+{
+  g_return_if_fail (format != NULL);
+  g_return_if_fail (in != NULL);
+  g_return_if_fail (out != NULL);
+  g_return_if_fail (n >= 0);
+
+  switch (babl_format_get_bytes_per_pixel (format))
+    {
+    case 4:
+      Process<guint8>::process (in, aux, out, n, mask, 0);
+      break;
+
+    case 8:
+      Process<guint16>::process (in, aux, out, n, mask, 0);
+      break;
+
+    case 16:
+      Process<guint32>::process (in, aux, out, n, mask, 0);
+      break;
+
+    default:
+      g_return_if_reached ();
+    }
+}
diff --git a/app/operations/gimpoperationmaskcomponents.h b/app/operations/gimpoperationmaskcomponents.h
new file mode 100644
index 0000000..0919a38
--- /dev/null
+++ b/app/operations/gimpoperationmaskcomponents.h
@@ -0,0 +1,68 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationmaskcomponents.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_MASK_COMPONENTS_H__
+#define __GIMP_OPERATION_MASK_COMPONENTS_H__
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_MASK_COMPONENTS            (gimp_operation_mask_components_get_type ())
+#define GIMP_OPERATION_MASK_COMPONENTS(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_MASK_COMPONENTS, GimpOperationMaskComponents))
+#define GIMP_OPERATION_MASK_COMPONENTS_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_MASK_COMPONENTS, GimpOperationMaskComponentsClass))
+#define GIMP_IS_OPERATION_MASK_COMPONENTS(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_MASK_COMPONENTS))
+#define GIMP_IS_OPERATION_MASK_COMPONENTS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_MASK_COMPONENTS))
+#define GIMP_OPERATION_MASK_COMPONENTS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_MASK_COMPONENTS, GimpOperationMaskComponentsClass))
+
+
+typedef struct _GimpOperationMaskComponents      GimpOperationMaskComponents;
+typedef struct _GimpOperationMaskComponentsClass GimpOperationMaskComponentsClass;
+
+struct _GimpOperationMaskComponents
+{
+  GeglOperationPointComposer  parent_instance;
+
+  GimpComponentMask           mask;
+  gdouble                     alpha;
+
+  guint32                     alpha_value;
+  gpointer                    process;
+  const Babl                 *format;
+};
+
+struct _GimpOperationMaskComponentsClass
+{
+  GeglOperationPointComposerClass  parent_class;
+};
+
+
+GType        gimp_operation_mask_components_get_type   (void) G_GNUC_CONST;
+
+const Babl * gimp_operation_mask_components_get_format (const Babl        *input_format);
+
+void         gimp_operation_mask_components_process    (const Babl        *format,
+                                                        gconstpointer      in,
+                                                        gconstpointer      aux,
+                                                        gpointer           out,
+                                                        gint               n,
+                                                        GimpComponentMask  mask);
+
+
+#endif /* __GIMP_OPERATION_MASK_COMPONENTS_H__ */
diff --git a/app/operations/gimpoperationoffset.c b/app/operations/gimpoperationoffset.c
new file mode 100644
index 0000000..ee269ed
--- /dev/null
+++ b/app/operations/gimpoperationoffset.c
@@ -0,0 +1,497 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationoffset.c
+ * Copyright (C) 2019 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl-plugin.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "operations-types.h"
+
+#include "gegl/gimp-gegl-loops.h"
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimpoperationoffset.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_CONTEXT,
+  PROP_TYPE,
+  PROP_X,
+  PROP_Y
+};
+
+
+static void            gimp_operation_offset_dispose                   (GObject              *object);
+static void            gimp_operation_offset_get_property              (GObject              *object,
+                                                                        guint                 property_id,
+                                                                        GValue               *value,
+                                                                        GParamSpec           *pspec);
+static void            gimp_operation_offset_set_property              (GObject              *object,
+                                                                        guint                 property_id,
+                                                                        const GValue         *value,
+                                                                        GParamSpec           *pspec);
+
+static GeglRectangle   gimp_operation_offset_get_required_for_output   (GeglOperation        *operation,
+                                                                        const gchar          *input_pad,
+                                                                        const GeglRectangle  *output_roi);
+static GeglRectangle   gimp_operation_offset_get_invalidated_by_change (GeglOperation        *operation,
+                                                                        const gchar          *input_pad,
+                                                                        const GeglRectangle  *input_roi);
+static void            gimp_operation_offset_prepare                   (GeglOperation        *operation);
+static gboolean        gimp_operation_offset_parent_process            (GeglOperation        *operation,
+                                                                        GeglOperationContext *context,
+                                                                        const gchar          *output_pad,
+                                                                        const GeglRectangle  *result,
+                                                                        gint                  level);
+
+static gboolean        gimp_operation_offset_process                   (GeglOperation        *operation,
+                                                                        GeglBuffer           *input,
+                                                                        GeglBuffer           *output,
+                                                                        const GeglRectangle  *roi,
+                                                                        gint                  level);
+
+static void            gimp_operation_offset_get_offset                (GimpOperationOffset  *offset,
+                                                                        gboolean              invert,
+                                                                        gint                 *x,
+                                                                        gint                 *y);
+static void            gimp_operation_offset_get_rect                  (GimpOperationOffset  *offset,
+                                                                        gboolean              invert,
+                                                                        const GeglRectangle  *roi,
+                                                                        GeglRectangle        *rect);
+
+
+G_DEFINE_TYPE (GimpOperationOffset, gimp_operation_offset,
+               GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_offset_parent_class
+
+
+static void
+gimp_operation_offset_class_init (GimpOperationOffsetClass *klass)
+{
+  GObjectClass             *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationFilterClass *filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  object_class->dispose                      = gimp_operation_offset_dispose;
+  object_class->set_property                 = gimp_operation_offset_set_property;
+  object_class->get_property                 = gimp_operation_offset_get_property;
+
+  operation_class->get_required_for_output   = gimp_operation_offset_get_required_for_output;
+  operation_class->get_invalidated_by_change = gimp_operation_offset_get_invalidated_by_change;
+  operation_class->prepare                   = gimp_operation_offset_prepare;
+  operation_class->process                   = gimp_operation_offset_parent_process;
+
+  operation_class->threaded                  = FALSE;
+  operation_class->cache_policy              = GEGL_CACHE_POLICY_NEVER;
+
+  filter_class->process                      = gimp_operation_offset_process;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:offset",
+                                 "categories",  "transform",
+                                 "description", _("Shift the pixels, optionally wrapping them at the borders"),
+                                 NULL);
+
+  g_object_class_install_property (object_class, PROP_CONTEXT,
+                                   g_param_spec_object ("context",
+                                                        "Context",
+                                                        "A GimpContext",
+                                                        GIMP_TYPE_CONTEXT,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_TYPE,
+                                   g_param_spec_enum  ("type",
+                                                       "Type",
+                                                       "Offset type",
+                                                       GIMP_TYPE_OFFSET_TYPE,
+                                                       GIMP_OFFSET_WRAP_AROUND,
+                                                       G_PARAM_READWRITE |
+                                                       G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_X,
+                                   g_param_spec_int ("x",
+                                                     "X Offset",
+                                                     "X offset",
+                                                     G_MININT, G_MAXINT, 0,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_Y,
+                                   g_param_spec_int ("y",
+                                                     "Y Offset",
+                                                     "Y offset",
+                                                     G_MININT, G_MAXINT, 0,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_offset_init (GimpOperationOffset *self)
+{
+}
+
+static void
+gimp_operation_offset_dispose (GObject *object)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (object);
+
+  g_clear_object (&offset->context);
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_offset_get_property (GObject    *object,
+                                    guint       property_id,
+                                    GValue     *value,
+                                    GParamSpec *pspec)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (object);
+
+  switch (property_id)
+    {
+    case PROP_CONTEXT:
+      g_value_set_object (value, offset->context);
+      break;
+
+    case PROP_TYPE:
+      g_value_set_enum (value, offset->type);
+      break;
+
+    case PROP_X:
+      g_value_set_int (value, offset->x);
+      break;
+
+    case PROP_Y:
+      g_value_set_int (value, offset->y);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_offset_set_property (GObject      *object,
+                                         guint         property_id,
+                                         const GValue *value,
+                                         GParamSpec   *pspec)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (object);
+
+  switch (property_id)
+    {
+    case PROP_CONTEXT:
+      g_set_object (&offset->context, g_value_get_object (value));
+      break;
+
+    case PROP_TYPE:
+      offset->type = g_value_get_enum (value);
+      break;
+
+    case PROP_X:
+      offset->x = g_value_get_int (value);
+      break;
+
+    case PROP_Y:
+      offset->y = g_value_get_int (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static GeglRectangle
+gimp_operation_offset_get_required_for_output (GeglOperation       *operation,
+                                               const gchar         *input_pad,
+                                               const GeglRectangle *output_roi)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+  GeglRectangle        rect;
+
+  gimp_operation_offset_get_rect (offset, TRUE, output_roi, &rect);
+
+  return rect;
+}
+
+static GeglRectangle
+gimp_operation_offset_get_invalidated_by_change (GeglOperation       *operation,
+                                                 const gchar         *input_pad,
+                                                 const GeglRectangle *input_roi)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+  GeglRectangle        rect;
+
+  gimp_operation_offset_get_rect (offset, FALSE, input_roi, &rect);
+
+  return rect;
+}
+
+static void
+gimp_operation_offset_prepare (GeglOperation *operation)
+{
+  const Babl *format;
+
+  format = gegl_operation_get_source_format (operation, "input");
+
+  if (! format)
+    format = babl_format ("RGBA float");
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+gimp_operation_offset_parent_process (GeglOperation        *operation,
+                                      GeglOperationContext *context,
+                                      const gchar          *output_pad,
+                                      const GeglRectangle  *result,
+                                      gint                  level)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+  GObject             *input;
+  gint                 x;
+  gint                 y;
+
+  input = gegl_operation_context_get_object (context, "input");
+
+  gimp_operation_offset_get_offset (offset, FALSE, &x, &y);
+
+  if (x == 0 && y == 0)
+    {
+      gegl_operation_context_set_object (context, "output", input);
+
+      return TRUE;
+    }
+  else if (offset->type  == GIMP_OFFSET_TRANSPARENT ||
+           (offset->type == GIMP_OFFSET_BACKGROUND  &&
+            ! offset->context))
+    {
+      GObject *output = NULL;
+
+      if (input)
+        {
+          GeglRectangle bounds;
+          GeglRectangle extent;
+
+          bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+          extent = *gegl_buffer_get_extent (GEGL_BUFFER (input));
+
+          extent.x += x;
+          extent.y += y;
+
+          if (gegl_rectangle_intersect (&extent, &extent, &bounds))
+            {
+              output = g_object_new (GEGL_TYPE_BUFFER,
+                                     "source",  input,
+                                     "x",       extent.x,
+                                     "y",       extent.y,
+                                     "width",   extent.width,
+                                     "height",  extent.height,
+                                     "shift-x", -x,
+                                     "shift-y", -y,
+                                     NULL);
+
+              if (gegl_object_get_has_forked (input))
+                gegl_object_set_has_forked (output);
+            }
+        }
+
+      gegl_operation_context_take_object (context, "output", output);
+
+      return TRUE;
+    }
+
+  return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
+                                                       output_pad, result,
+                                                       level);
+}
+
+static gboolean
+gimp_operation_offset_process (GeglOperation       *operation,
+                               GeglBuffer          *input,
+                               GeglBuffer          *output,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  GimpOperationOffset *offset = GIMP_OPERATION_OFFSET (operation);
+  GeglColor           *color  = NULL;
+  GeglRectangle        bounds;
+  gint                 x;
+  gint                 y;
+  gint                 i;
+
+  bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+  gimp_operation_offset_get_offset (offset, FALSE, &x, &y);
+
+  if (offset->type == GIMP_OFFSET_BACKGROUND && offset->context)
+    {
+      GimpRGB bg;
+
+      gimp_context_get_background (offset->context, &bg);
+
+      color = gimp_gegl_color_new (&bg);
+    }
+
+  for (i = 0; i < 4; i++)
+    {
+      GeglRectangle offset_bounds = bounds;
+      gint          offset_x      = x;
+      gint          offset_y      = y;
+
+      if (i & 1)
+        offset_x += x < 0 ? bounds.width  : -bounds.width;
+      if (i & 2)
+        offset_y += y < 0 ? bounds.height : -bounds.height;
+
+      offset_bounds.x += offset_x;
+      offset_bounds.y += offset_y;
+
+      if (gegl_rectangle_intersect (&offset_bounds, &offset_bounds, roi))
+        {
+          if (i == 0 || offset->type == GIMP_OFFSET_WRAP_AROUND)
+            {
+              GeglRectangle offset_roi = offset_bounds;
+
+              offset_roi.x -= offset_x;
+              offset_roi.y -= offset_y;
+
+              gimp_gegl_buffer_copy (input,  &offset_roi, GEGL_ABYSS_NONE,
+                                     output, &offset_bounds);
+            }
+          else if (color)
+            {
+              gegl_buffer_set_color (output, &offset_bounds, color);
+            }
+        }
+    }
+
+  g_clear_object (&color);
+
+  return TRUE;
+}
+
+static void
+gimp_operation_offset_get_offset (GimpOperationOffset *offset,
+                                  gboolean             invert,
+                                  gint                *x,
+                                  gint                *y)
+{
+  GeglRectangle bounds;
+
+  bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+  if (gegl_rectangle_is_empty (&bounds))
+    {
+      *x = 0;
+      *y = 0;
+
+      return;
+    }
+
+  *x = offset->x;
+  *y = offset->y;
+
+  if (invert)
+    {
+      *x = -*x;
+      *y = -*y;
+    }
+
+  if (offset->type == GIMP_OFFSET_WRAP_AROUND)
+    {
+      *x %= bounds.width;
+
+      if (*x < 0)
+        *x += bounds.width;
+
+      *y %= bounds.height;
+
+      if (*y < 0)
+        *y += bounds.height;
+    }
+  else
+    {
+      *x = CLAMP (*x, -bounds.width,  +bounds.width);
+      *y = CLAMP (*y, -bounds.height, +bounds.height);
+    }
+}
+
+static void
+gimp_operation_offset_get_rect (GimpOperationOffset *offset,
+                                gboolean             invert,
+                                const GeglRectangle *roi,
+                                GeglRectangle       *rect)
+{
+  GeglRectangle bounds;
+  gint          x;
+  gint          y;
+
+  bounds = gegl_operation_get_bounding_box (GEGL_OPERATION (offset));
+
+  if (gegl_rectangle_is_empty (&bounds))
+    {
+      rect->x      = 0;
+      rect->y      = 0;
+      rect->width  = 0;
+      rect->height = 0;
+
+      return;
+    }
+
+  gimp_operation_offset_get_offset (offset, invert, &x, &y);
+
+  *rect = *roi;
+
+  rect->x += x;
+  rect->y += y;
+
+  if (offset->type == GIMP_OFFSET_WRAP_AROUND)
+    {
+      if (rect->x + rect->width > bounds.x + bounds.width)
+        {
+          rect->x      = bounds.x;
+          rect->width  = bounds.width;
+        }
+
+      if (rect->y + rect->height > bounds.y + bounds.height)
+        {
+          rect->y      = bounds.y;
+          rect->height = bounds.height;
+        }
+    }
+
+  gegl_rectangle_intersect (rect, rect, &bounds);
+}
diff --git a/app/operations/gimpoperationoffset.h b/app/operations/gimpoperationoffset.h
new file mode 100644
index 0000000..dcd0e0b
--- /dev/null
+++ b/app/operations/gimpoperationoffset.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationoffset.h
+ * Copyright (C) 2019 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_OFFSET_H__
+#define __GIMP_OPERATION_OFFSET_H__
+
+
+#define GIMP_TYPE_OPERATION_OFFSET            (gimp_operation_offset_get_type ())
+#define GIMP_OPERATION_OFFSET(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_OFFSET, GimpOperationOffset))
+#define GIMP_OPERATION_OFFSET_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_OFFSET, GimpOperationOffsetClass))
+#define GIMP_IS_OPERATION_OFFSET(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_OFFSET))
+#define GIMP_IS_OPERATION_OFFSET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_OFFSET))
+#define GIMP_OPERATION_OFFSET_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_OFFSET, GimpOperationOffsetClass))
+
+
+typedef struct _GimpOperationOffset      GimpOperationOffset;
+typedef struct _GimpOperationOffsetClass GimpOperationOffsetClass;
+
+struct _GimpOperationOffset
+{
+  GeglOperationFilter  parent_instance;
+
+  GimpContext         *context;
+  GimpOffsetType       type;
+  gint                 x;
+  gint                 y;
+};
+
+struct _GimpOperationOffsetClass
+{
+  GeglOperationFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_offset_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_OFFSET_H__ */
diff --git a/app/operations/gimpoperationpointfilter.c b/app/operations/gimpoperationpointfilter.c
new file mode 100644
index 0000000..b9bfa1d
--- /dev/null
+++ b/app/operations/gimpoperationpointfilter.c
@@ -0,0 +1,131 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationpointfilter.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "operations-types.h"
+
+#include "gimpoperationpointfilter.h"
+
+
+static void   gimp_operation_point_filter_finalize (GObject       *object);
+static void   gimp_operation_point_filter_prepare  (GeglOperation *operation);
+
+
+G_DEFINE_ABSTRACT_TYPE (GimpOperationPointFilter, gimp_operation_point_filter,
+                        GEGL_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_point_filter_parent_class
+
+
+static void
+gimp_operation_point_filter_class_init (GimpOperationPointFilterClass *klass)
+{
+  GObjectClass        *object_class = G_OBJECT_CLASS (klass);
+  GeglOperationClass  *operation_class = GEGL_OPERATION_CLASS (klass);
+
+  object_class->finalize = gimp_operation_point_filter_finalize;
+
+  operation_class->prepare = gimp_operation_point_filter_prepare;
+}
+
+static void
+gimp_operation_point_filter_init (GimpOperationPointFilter *self)
+{
+}
+
+static void
+gimp_operation_point_filter_finalize (GObject *object)
+{
+  GimpOperationPointFilter *self = GIMP_OPERATION_POINT_FILTER (object);
+
+  g_clear_object (&self->config);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+void
+gimp_operation_point_filter_get_property (GObject    *object,
+                                          guint       property_id,
+                                          GValue     *value,
+                                          GParamSpec *pspec)
+{
+  GimpOperationPointFilter *self = GIMP_OPERATION_POINT_FILTER (object);
+
+  switch (property_id)
+    {
+    case GIMP_OPERATION_POINT_FILTER_PROP_LINEAR:
+      g_value_set_boolean (value, self->linear);
+      break;
+
+    case GIMP_OPERATION_POINT_FILTER_PROP_CONFIG:
+      g_value_set_object (value, self->config);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+void
+gimp_operation_point_filter_set_property (GObject      *object,
+                                          guint         property_id,
+                                          const GValue *value,
+                                          GParamSpec   *pspec)
+{
+  GimpOperationPointFilter *self = GIMP_OPERATION_POINT_FILTER (object);
+
+  switch (property_id)
+    {
+    case GIMP_OPERATION_POINT_FILTER_PROP_LINEAR:
+      self->linear = g_value_get_boolean (value);
+      break;
+
+    case GIMP_OPERATION_POINT_FILTER_PROP_CONFIG:
+      if (self->config)
+        g_object_unref (self->config);
+      self->config = g_value_dup_object (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_point_filter_prepare (GeglOperation *operation)
+{
+  GimpOperationPointFilter *self = GIMP_OPERATION_POINT_FILTER (operation);
+  const Babl               *space = gegl_operation_get_source_space (operation,
+                                                                     "input");
+  const Babl               *format;
+
+  if (self->linear)
+    format = babl_format_with_space ("RGBA float", space);
+  else
+    format = babl_format_with_space ("R'G'B'A float", space);
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "output", format);
+}
diff --git a/app/operations/gimpoperationpointfilter.h b/app/operations/gimpoperationpointfilter.h
new file mode 100644
index 0000000..f039af7
--- /dev/null
+++ b/app/operations/gimpoperationpointfilter.h
@@ -0,0 +1,73 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationpointfilter.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_POINT_FILTER_H__
+#define __GIMP_OPERATION_POINT_FILTER_H__
+
+
+#include <gegl-plugin.h>
+#include <operation/gegl-operation-point-filter.h>
+
+
+enum
+{
+  GIMP_OPERATION_POINT_FILTER_PROP_0,
+  GIMP_OPERATION_POINT_FILTER_PROP_LINEAR,
+  GIMP_OPERATION_POINT_FILTER_PROP_CONFIG
+};
+
+
+#define GIMP_TYPE_OPERATION_POINT_FILTER            (gimp_operation_point_filter_get_type ())
+#define GIMP_OPERATION_POINT_FILTER(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_POINT_FILTER, GimpOperationPointFilter))
+#define GIMP_OPERATION_POINT_FILTER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_POINT_FILTER, GimpOperationPointFilterClass))
+#define GIMP_IS_OPERATION_POINT_FILTER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_POINT_FILTER))
+#define GIMP_IS_OPERATION_POINT_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_POINT_FILTER))
+#define GIMP_OPERATION_POINT_FILTER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_POINT_FILTER, GimpOperationPointFilterClass))
+
+
+typedef struct _GimpOperationPointFilterClass GimpOperationPointFilterClass;
+
+struct _GimpOperationPointFilter
+{
+  GeglOperationPointFilter  parent_instance;
+
+  gboolean                  linear;
+  GObject                  *config;
+};
+
+struct _GimpOperationPointFilterClass
+{
+  GeglOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_point_filter_get_type     (void) G_GNUC_CONST;
+
+void    gimp_operation_point_filter_get_property (GObject      *object,
+                                                  guint         property_id,
+                                                  GValue       *value,
+                                                  GParamSpec   *pspec);
+void    gimp_operation_point_filter_set_property (GObject      *object,
+                                                  guint         property_id,
+                                                  const GValue *value,
+                                                  GParamSpec   *pspec);
+
+
+#endif /* __GIMP_OPERATION_POINT_FILTER_H__ */
diff --git a/app/operations/gimpoperationposterize.c b/app/operations/gimpoperationposterize.c
new file mode 100644
index 0000000..88f5d26
--- /dev/null
+++ b/app/operations/gimpoperationposterize.c
@@ -0,0 +1,165 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationposterize.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationposterize.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_LEVELS
+};
+
+
+static void     gimp_operation_posterize_get_property (GObject             *object,
+                                                       guint                property_id,
+                                                       GValue              *value,
+                                                       GParamSpec          *pspec);
+static void     gimp_operation_posterize_set_property (GObject             *object,
+                                                       guint                property_id,
+                                                       const GValue        *value,
+                                                       GParamSpec          *pspec);
+
+static gboolean gimp_operation_posterize_process      (GeglOperation       *operation,
+                                                       void                *in_buf,
+                                                       void                *out_buf,
+                                                       glong                samples,
+                                                       const GeglRectangle *roi,
+                                                       gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationPosterize, gimp_operation_posterize,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_posterize_parent_class
+
+
+static void
+gimp_operation_posterize_class_init (GimpOperationPosterizeClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_posterize_set_property;
+  object_class->get_property = gimp_operation_posterize_get_property;
+
+  point_class->process       = gimp_operation_posterize_process;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:posterize",
+                                 "categories",  "color",
+                                 "description", _("Reduce to a limited set of colors"),
+                                 NULL);
+
+  GIMP_CONFIG_PROP_INT (object_class, PROP_LEVELS,
+                        "levels",
+                        _("Posterize levels"),
+                        NULL,
+                        2, 256, 3,
+                        GIMP_PARAM_STATIC_STRINGS);
+}
+
+static void
+gimp_operation_posterize_init (GimpOperationPosterize *self)
+{
+}
+
+static void
+gimp_operation_posterize_get_property (GObject    *object,
+                                       guint       property_id,
+                                       GValue     *value,
+                                       GParamSpec *pspec)
+{
+  GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_LEVELS:
+      g_value_set_int (value, posterize->levels);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_posterize_set_property (GObject      *object,
+                                       guint         property_id,
+                                       const GValue *value,
+                                       GParamSpec   *pspec)
+{
+  GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_LEVELS:
+      posterize->levels = g_value_get_int (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static gboolean
+gimp_operation_posterize_process (GeglOperation       *operation,
+                                  void                *in_buf,
+                                  void                *out_buf,
+                                  glong                samples,
+                                  const GeglRectangle *roi,
+                                  gint                 level)
+{
+  GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (operation);
+  gfloat                 *src       = in_buf;
+  gfloat                 *dest      = out_buf;
+  gfloat                  levels;
+
+  levels = posterize->levels - 1.0;
+
+  while (samples--)
+    {
+      dest[RED]   = RINT (src[RED]   * levels) / levels;
+      dest[GREEN] = RINT (src[GREEN] * levels) / levels;
+      dest[BLUE]  = RINT (src[BLUE]  * levels) / levels;
+      dest[ALPHA] = RINT (src[ALPHA] * levels) / levels;
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationposterize.h b/app/operations/gimpoperationposterize.h
new file mode 100644
index 0000000..06e5731
--- /dev/null
+++ b/app/operations/gimpoperationposterize.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationposterize.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_POSTERIZE_H__
+#define __GIMP_OPERATION_POSTERIZE_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_POSTERIZE            (gimp_operation_posterize_get_type ())
+#define GIMP_OPERATION_POSTERIZE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_POSTERIZE, GimpOperationPosterize))
+#define GIMP_OPERATION_POSTERIZE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_POSTERIZE, GimpOperationPosterizeClass))
+#define GIMP_IS_OPERATION_POSTERIZE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_POSTERIZE))
+#define GIMP_IS_OPERATION_POSTERIZE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_POSTERIZE))
+#define GIMP_OPERATION_POSTERIZE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_POSTERIZE, GimpOperationPosterizeClass))
+
+
+typedef struct _GimpOperationPosterize      GimpOperationPosterize;
+typedef struct _GimpOperationPosterizeClass GimpOperationPosterizeClass;
+
+struct _GimpOperationPosterize
+{
+  GimpOperationPointFilter  parent_instance;
+
+  gint                      levels;
+};
+
+struct _GimpOperationPosterizeClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_posterize_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_POSTERIZE_H__ */
diff --git a/app/operations/gimpoperationprofiletransform.c b/app/operations/gimpoperationprofiletransform.c
new file mode 100644
index 0000000..2e42459
--- /dev/null
+++ b/app/operations/gimpoperationprofiletransform.c
@@ -0,0 +1,307 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationprofiletransform.c
+ * Copyright (C) 2016 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpcolor/gimpcolor.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationprofiletransform.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_SRC_PROFILE,
+  PROP_SRC_FORMAT,
+  PROP_DEST_PROFILE,
+  PROP_DEST_FORMAT,
+  PROP_RENDERING_INTENT,
+  PROP_BLACK_POINT_COMPENSATION
+};
+
+
+static void       gimp_operation_profile_transform_finalize     (GObject             *object);
+
+static void       gimp_operation_profile_transform_get_property (GObject             *object,
+                                                                 guint                property_id,
+                                                                 GValue              *value,
+                                                                 GParamSpec          *pspec);
+static void       gimp_operation_profile_transform_set_property (GObject             *object,
+                                                                 guint                property_id,
+                                                                 const GValue        *value,
+                                                                 GParamSpec          *pspec);
+
+static void       gimp_operation_profile_transform_prepare      (GeglOperation       *operation);
+static gboolean   gimp_operation_profile_transform_process      (GeglOperation       *operation,
+                                                                 void                *in_buf,
+                                                                 void                *out_buf,
+                                                                 glong                samples,
+                                                                 const GeglRectangle *roi,
+                                                                 gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationProfileTransform, gimp_operation_profile_transform,
+               GEGL_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_profile_transform_parent_class
+
+
+static void
+gimp_operation_profile_transform_class_init (GimpOperationProfileTransformClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->finalize     = gimp_operation_profile_transform_finalize;
+  object_class->set_property = gimp_operation_profile_transform_set_property;
+  object_class->get_property = gimp_operation_profile_transform_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:profile-transform",
+                                 "categories",  "color",
+                                 "description",
+                                 "Transform between two color profiles",
+                                 NULL);
+
+  operation_class->prepare = gimp_operation_profile_transform_prepare;
+
+  point_class->process     = gimp_operation_profile_transform_process;
+
+  g_object_class_install_property (object_class, PROP_SRC_PROFILE,
+                                   g_param_spec_object ("src-profile",
+                                                        "Source Profile",
+                                                        "Source Profile",
+                                                        GIMP_TYPE_COLOR_PROFILE,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_SRC_FORMAT,
+                                   g_param_spec_pointer ("src-format",
+                                                         "Source Format",
+                                                         "Source Format",
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_DEST_PROFILE,
+                                   g_param_spec_object ("dest-profile",
+                                                        "Destination Profile",
+                                                        "Destination Profile",
+                                                        GIMP_TYPE_COLOR_PROFILE,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_DEST_FORMAT,
+                                   g_param_spec_pointer ("dest-format",
+                                                         "Destination Format",
+                                                         "Destination Format",
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_RENDERING_INTENT,
+                                   g_param_spec_enum ("rendering-intent",
+                                                      "Rendering Intent",
+                                                      "Rendering Intent",
+                                                      GIMP_TYPE_COLOR_RENDERING_INTENT,
+                                                      GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
+                                                      G_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_BLACK_POINT_COMPENSATION,
+                                   g_param_spec_boolean ("black-point-compensation",
+                                                         "Black Point Compensation",
+                                                         "Black Point Compensation",
+                                                         TRUE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_profile_transform_init (GimpOperationProfileTransform *self)
+{
+}
+
+static void
+gimp_operation_profile_transform_finalize (GObject *object)
+{
+  GimpOperationProfileTransform *self = GIMP_OPERATION_PROFILE_TRANSFORM (object);
+
+  g_clear_object (&self->src_profile);
+  g_clear_object (&self->dest_profile);
+  g_clear_object (&self->transform);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_profile_transform_get_property (GObject    *object,
+                                               guint       property_id,
+                                               GValue     *value,
+                                               GParamSpec *pspec)
+{
+  GimpOperationProfileTransform *self = GIMP_OPERATION_PROFILE_TRANSFORM (object);
+
+  switch (property_id)
+    {
+    case PROP_SRC_PROFILE:
+      g_value_set_object (value, self->src_profile);
+      break;
+
+    case PROP_SRC_FORMAT:
+      g_value_set_pointer (value, (gpointer) self->src_format);
+      break;
+
+    case PROP_DEST_PROFILE:
+      g_value_set_object (value, self->dest_profile);
+      break;
+
+    case PROP_DEST_FORMAT:
+      g_value_set_pointer (value, (gpointer) self->dest_format);
+      break;
+
+    case PROP_RENDERING_INTENT:
+      g_value_set_enum (value, self->rendering_intent);
+      break;
+
+    case PROP_BLACK_POINT_COMPENSATION:
+      g_value_set_boolean (value, self->black_point_compensation);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_profile_transform_set_property (GObject      *object,
+                                               guint         property_id,
+                                               const GValue *value,
+                                               GParamSpec   *pspec)
+{
+  GimpOperationProfileTransform *self = GIMP_OPERATION_PROFILE_TRANSFORM (object);
+
+  switch (property_id)
+    {
+    case PROP_SRC_PROFILE:
+      if (self->src_profile)
+        g_object_unref (self->src_profile);
+      self->src_profile = g_value_dup_object (value);
+      break;
+
+    case PROP_SRC_FORMAT:
+      self->src_format = g_value_get_pointer (value);
+      break;
+
+    case PROP_DEST_PROFILE:
+      if (self->dest_profile)
+        g_object_unref (self->dest_profile);
+      self->dest_profile = g_value_dup_object (value);
+      break;
+
+    case PROP_DEST_FORMAT:
+      self->dest_format = g_value_get_pointer (value);
+      break;
+
+    case PROP_RENDERING_INTENT:
+      self->rendering_intent = g_value_get_enum (value);
+      break;
+
+    case PROP_BLACK_POINT_COMPENSATION:
+      self->black_point_compensation = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_profile_transform_prepare (GeglOperation *operation)
+{
+  GimpOperationProfileTransform *self = GIMP_OPERATION_PROFILE_TRANSFORM (operation);
+
+  g_clear_object (&self->transform);
+
+  if (! self->src_format)
+    self->src_format = babl_format ("RGBA float");
+
+  if (! self->dest_format)
+    self->dest_format = babl_format ("RGBA float");
+
+  if (self->src_profile && self->dest_profile)
+    {
+      GimpColorTransformFlags flags = 0;
+
+      if (self->black_point_compensation)
+        flags |= GIMP_COLOR_TRANSFORM_FLAGS_BLACK_POINT_COMPENSATION;
+
+      flags |= GIMP_COLOR_TRANSFORM_FLAGS_NOOPTIMIZE;
+
+      self->transform = gimp_color_transform_new (self->src_profile,
+                                                  self->src_format,
+                                                  self->dest_profile,
+                                                  self->dest_format,
+                                                  self->rendering_intent,
+                                                  flags);
+    }
+
+  gegl_operation_set_format (operation, "input",  self->src_format);
+  gegl_operation_set_format (operation, "output", self->dest_format);
+}
+
+static gboolean
+gimp_operation_profile_transform_process (GeglOperation       *operation,
+                                          void                *in_buf,
+                                          void                *out_buf,
+                                          glong                samples,
+                                          const GeglRectangle *roi,
+                                          gint                 level)
+{
+  GimpOperationProfileTransform *self = GIMP_OPERATION_PROFILE_TRANSFORM (operation);
+  gpointer                      *src  = in_buf;
+  gpointer                      *dest = out_buf;
+
+  if (self->transform)
+    {
+      gimp_color_transform_process_pixels (self->transform,
+                                           self->src_format,
+                                           src,
+                                           self->dest_format,
+                                           dest,
+                                           samples);
+    }
+  else
+    {
+      babl_process (babl_fish (self->src_format,
+                               self->dest_format),
+                    src, dest, samples);
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationprofiletransform.h b/app/operations/gimpoperationprofiletransform.h
new file mode 100644
index 0000000..52aaf4a
--- /dev/null
+++ b/app/operations/gimpoperationprofiletransform.h
@@ -0,0 +1,65 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationprofiletransform.h
+ * Copyright (C) 2016 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_PROFILE_TRANSFORM_H__
+#define __GIMP_OPERATION_PROFILE_TRANSFORM_H__
+
+
+#include <gegl-plugin.h>
+#include <operation/gegl-operation-point-filter.h>
+
+
+#define GIMP_TYPE_OPERATION_PROFILE_TRANSFORM            (gimp_operation_profile_transform_get_type ())
+#define GIMP_OPERATION_PROFILE_TRANSFORM(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_PROFILE_TRANSFORM, GimpOperationProfileTransform))
+#define GIMP_OPERATION_PROFILE_TRANSFORM_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_PROFILE_TRANSFORM, GimpOperationProfileTransformClass))
+#define GIMP_IS_OPERATION_PROFILE_TRANSFORM(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_PROFILE_TRANSFORM))
+#define GIMP_IS_OPERATION_PROFILE_TRANSFORM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_PROFILE_TRANSFORM))
+#define GIMP_OPERATION_PROFILE_TRANSFORM_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_PROFILE_TRANSFORM, GimpOperationProfileTransformClass))
+
+
+typedef struct _GimpOperationProfileTransform      GimpOperationProfileTransform;
+typedef struct _GimpOperationProfileTransformClass GimpOperationProfileTransformClass;
+
+struct _GimpOperationProfileTransform
+{
+  GeglOperationPointFilter  parent_instance;
+
+  GimpColorProfile         *src_profile;
+  const Babl               *src_format;
+
+  GimpColorProfile         *dest_profile;
+  const Babl               *dest_format;
+
+  GimpColorRenderingIntent  rendering_intent;
+  gboolean                  black_point_compensation;
+
+  GimpColorTransform       *transform;
+};
+
+struct _GimpOperationProfileTransformClass
+{
+  GeglOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_profile_transform_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_PROFILE_TRANSFORM_H__ */
diff --git a/app/operations/gimpoperationscalarmultiply.c b/app/operations/gimpoperationscalarmultiply.c
new file mode 100644
index 0000000..6416300
--- /dev/null
+++ b/app/operations/gimpoperationscalarmultiply.c
@@ -0,0 +1,189 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationscalarmultiply.c
+ * Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "operations-types.h"
+
+#include "gimpoperationscalarmultiply.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_N_COMPONENTS,
+  PROP_FACTOR
+};
+
+
+static void       gimp_operation_scalar_multiply_get_property (GObject             *object,
+                                                               guint                property_id,
+                                                               GValue              *value,
+                                                               GParamSpec          *pspec);
+static void       gimp_operation_scalar_multiply_set_property (GObject             *object,
+                                                               guint                property_id,
+                                                               const GValue        *value,
+                                                               GParamSpec          *pspec);
+
+static void       gimp_operation_scalar_multiply_prepare      (GeglOperation       *operation);
+static gboolean   gimp_operation_scalar_multiply_process      (GeglOperation       *operation,
+                                                               void                *in_buf,
+                                                               void                *out_buf,
+                                                               glong                samples,
+                                                               const GeglRectangle *roi,
+                                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationScalarMultiply, gimp_operation_scalar_multiply,
+               GEGL_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_scalar_multiply_parent_class
+
+
+static void
+gimp_operation_scalar_multiply_class_init (GimpOperationScalarMultiplyClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_scalar_multiply_set_property;
+  object_class->get_property = gimp_operation_scalar_multiply_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:scalar-multiply",
+                                 "categories",  "gimp",
+                                 "description", "Multiply all floats in a buffer by a factor",
+                                 NULL);
+
+  operation_class->prepare = gimp_operation_scalar_multiply_prepare;
+
+  point_class->process     = gimp_operation_scalar_multiply_process;
+
+  g_object_class_install_property (object_class, PROP_N_COMPONENTS,
+                                   g_param_spec_int ("n-components",
+                                                     "N Components",
+                                                     "Number of components in the input/output vectors",
+                                                     1, 16, 2,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_FACTOR,
+                                   g_param_spec_double ("factor",
+                                                        "Factor",
+                                                        "The scalar factor",
+                                                        G_MINFLOAT, G_MAXFLOAT,
+                                                        1.0,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_scalar_multiply_init (GimpOperationScalarMultiply *self)
+{
+}
+
+static void
+gimp_operation_scalar_multiply_get_property (GObject    *object,
+                                             guint       property_id,
+                                             GValue     *value,
+                                             GParamSpec *pspec)
+{
+  GimpOperationScalarMultiply *self = GIMP_OPERATION_SCALAR_MULTIPLY (object);
+
+  switch (property_id)
+    {
+    case PROP_N_COMPONENTS:
+      g_value_set_int (value, self->n_components);
+      break;
+
+    case PROP_FACTOR:
+      g_value_set_double (value, self->factor);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_scalar_multiply_set_property (GObject      *object,
+                                             guint         property_id,
+                                             const GValue *value,
+                                             GParamSpec   *pspec)
+{
+  GimpOperationScalarMultiply *self = GIMP_OPERATION_SCALAR_MULTIPLY (object);
+
+  switch (property_id)
+    {
+    case PROP_N_COMPONENTS:
+      self->n_components = g_value_get_int (value);
+      break;
+
+    case PROP_FACTOR:
+      self->factor = g_value_get_double (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_scalar_multiply_prepare (GeglOperation *operation)
+{
+  GimpOperationScalarMultiply *self = GIMP_OPERATION_SCALAR_MULTIPLY (operation);
+  const Babl                  *format;
+
+  format = babl_format_n (babl_type ("float"), self->n_components);
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+gimp_operation_scalar_multiply_process (GeglOperation       *operation,
+                                        void                *in_buf,
+                                        void                *out_buf,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  GimpOperationScalarMultiply *self = GIMP_OPERATION_SCALAR_MULTIPLY (operation);
+  gfloat                      *src  = in_buf;
+  gfloat                      *dest = out_buf;
+  glong                        n_samples;
+
+  n_samples = samples * self->n_components;
+
+  while (n_samples--)
+    {
+      *dest = *src * self->factor;
+
+      src++;
+      dest++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationscalarmultiply.h b/app/operations/gimpoperationscalarmultiply.h
new file mode 100644
index 0000000..61122b7
--- /dev/null
+++ b/app/operations/gimpoperationscalarmultiply.h
@@ -0,0 +1,56 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationscalarmultiply.h
+ * Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SCALAR_MULTIPLY_H__
+#define __GIMP_OPERATION_SCALAR_MULTIPLY_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_SCALAR_MULTIPLY            (gimp_operation_scalar_multiply_get_type ())
+#define GIMP_OPERATION_SCALAR_MULTIPLY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SCALAR_MULTIPLY, GimpOperationScalarMultiply))
+#define GIMP_OPERATION_SCALAR_MULTIPLY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SCALAR_MULTIPLY, GimpOperationScalarMultiplyClass))
+#define GIMP_IS_OPERATION_SCALAR_MULTIPLY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SCALAR_MULTIPLY))
+#define GIMP_IS_OPERATION_SCALAR_MULTIPLY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SCALAR_MULTIPLY))
+#define GIMP_OPERATION_SCALAR_MULTIPLY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SCALAR_MULTIPLY, GimpOperationScalarMultiplyClass))
+
+
+typedef struct _GimpOperationScalarMultiply      GimpOperationScalarMultiply;
+typedef struct _GimpOperationScalarMultiplyClass GimpOperationScalarMultiplyClass;
+
+struct _GimpOperationScalarMultiply
+{
+  GeglOperationPointFilter  parent_instance;
+
+  gint                      n_components;
+  gdouble                   factor;
+};
+
+struct _GimpOperationScalarMultiplyClass
+{
+  GeglOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_scalar_multiply_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SCALAR_MULTIPLY_H__ */
diff --git a/app/operations/gimpoperationsemiflatten.c b/app/operations/gimpoperationsemiflatten.c
new file mode 100644
index 0000000..1352f02
--- /dev/null
+++ b/app/operations/gimpoperationsemiflatten.c
@@ -0,0 +1,191 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsemiflatten.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Ported from the semi-flatten plug-in
+ * by Adam D. Moss, adam@foxbox.org.  1998/01/27
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationsemiflatten.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_COLOR
+};
+
+
+static void       gimp_operation_semi_flatten_get_property (GObject             *object,
+                                                            guint                property_id,
+                                                            GValue              *value,
+                                                            GParamSpec          *pspec);
+static void       gimp_operation_semi_flatten_set_property (GObject             *object,
+                                                            guint                property_id,
+                                                            const GValue        *value,
+                                                            GParamSpec          *pspec);
+
+static void       gimp_operation_semi_flatten_prepare      (GeglOperation       *operation);
+static gboolean   gimp_operation_semi_flatten_process      (GeglOperation       *operation,
+                                                            void                *in_buf,
+                                                            void                *out_buf,
+                                                            glong                samples,
+                                                            const GeglRectangle *roi,
+                                                            gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationSemiFlatten, gimp_operation_semi_flatten,
+               GEGL_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_semi_flatten_parent_class
+
+
+static void
+gimp_operation_semi_flatten_class_init (GimpOperationSemiFlattenClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+  GimpRGB                        white;
+
+  object_class->set_property = gimp_operation_semi_flatten_set_property;
+  object_class->get_property = gimp_operation_semi_flatten_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:semi-flatten",
+                                 "categories",  "color",
+                                 "description", _("Replace partial transparency with a color"),
+                                 NULL);
+
+  operation_class->prepare = gimp_operation_semi_flatten_prepare;
+
+  point_class->process     = gimp_operation_semi_flatten_process;
+
+  gimp_rgba_set (&white, 1.0, 1.0, 1.0, 1.0);
+
+  g_object_class_install_property (object_class, PROP_COLOR,
+                                   gimp_param_spec_rgb ("color",
+                                                        _("Color"),
+                                                        _("The color"),
+                                                        FALSE, &white,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_semi_flatten_init (GimpOperationSemiFlatten *self)
+{
+}
+
+static void
+gimp_operation_semi_flatten_get_property (GObject    *object,
+                                          guint       property_id,
+                                          GValue     *value,
+                                          GParamSpec *pspec)
+{
+  GimpOperationSemiFlatten *self = GIMP_OPERATION_SEMI_FLATTEN (object);
+
+  switch (property_id)
+    {
+    case PROP_COLOR:
+      gimp_value_set_rgb (value, &self->color);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_semi_flatten_set_property (GObject      *object,
+                                          guint         property_id,
+                                          const GValue *value,
+                                          GParamSpec   *pspec)
+{
+  GimpOperationSemiFlatten *self = GIMP_OPERATION_SEMI_FLATTEN (object);
+
+  switch (property_id)
+    {
+    case PROP_COLOR:
+      gimp_value_get_rgb (value, &self->color);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_semi_flatten_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("RGBA float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("RGBA float", space));
+}
+
+static gboolean
+gimp_operation_semi_flatten_process (GeglOperation       *operation,
+                                     void                *in_buf,
+                                     void                *out_buf,
+                                     glong                samples,
+                                     const GeglRectangle *roi,
+                                     gint                 level)
+{
+  GimpOperationSemiFlatten *self = GIMP_OPERATION_SEMI_FLATTEN (operation);
+  gfloat                   *src  = in_buf;
+  gfloat                   *dest = out_buf;
+
+  while (samples--)
+    {
+      gfloat alpha = src[ALPHA];
+
+      if (alpha <= 0.0 || alpha >= 1.0)
+        {
+          dest[RED]   = src[RED];
+          dest[GREEN] = src[GREEN];
+          dest[BLUE]  = src[BLUE];
+          dest[ALPHA] = alpha;
+        }
+      else
+        {
+          dest[RED]   = src[RED]   * alpha + self->color.r * (1.0 - alpha);
+          dest[GREEN] = src[GREEN] * alpha + self->color.g * (1.0 - alpha);
+          dest[BLUE]  = src[BLUE]  * alpha + self->color.b * (1.0 - alpha);
+          dest[ALPHA] = 1.0;
+        }
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationsemiflatten.h b/app/operations/gimpoperationsemiflatten.h
new file mode 100644
index 0000000..be6311e
--- /dev/null
+++ b/app/operations/gimpoperationsemiflatten.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsemiflatten.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SEMI_FLATTEN_H__
+#define __GIMP_OPERATION_SEMI_FLATTEN_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_SEMI_FLATTEN            (gimp_operation_semi_flatten_get_type ())
+#define GIMP_OPERATION_SEMI_FLATTEN(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SEMI_FLATTEN, GimpOperationSemiFlatten))
+#define GIMP_OPERATION_SEMI_FLATTEN_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SEMI_FLATTEN, GimpOperationSemiFlattenClass))
+#define GIMP_IS_OPERATION_SEMI_FLATTEN(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SEMI_FLATTEN))
+#define GIMP_IS_OPERATION_SEMI_FLATTEN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SEMI_FLATTEN))
+#define GIMP_OPERATION_SEMI_FLATTEN_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SEMI_FLATTEN, GimpOperationSemiFlattenClass))
+
+
+typedef struct _GimpOperationSemiFlatten      GimpOperationSemiFlatten;
+typedef struct _GimpOperationSemiFlattenClass GimpOperationSemiFlattenClass;
+
+struct _GimpOperationSemiFlatten
+{
+  GeglOperationPointFilter  parent_instance;
+
+  GimpRGB                   color;
+};
+
+struct _GimpOperationSemiFlattenClass
+{
+  GeglOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_semi_flatten_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SEMI_FLATTEN_H__ */
diff --git a/app/operations/gimpoperationsetalpha.c b/app/operations/gimpoperationsetalpha.c
new file mode 100644
index 0000000..b41af3c
--- /dev/null
+++ b/app/operations/gimpoperationsetalpha.c
@@ -0,0 +1,188 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsetalpha.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "operations-types.h"
+
+#include "gimpoperationsetalpha.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_VALUE
+};
+
+
+static void       gimp_operation_set_alpha_get_property (GObject             *object,
+                                                         guint                property_id,
+                                                         GValue              *value,
+                                                         GParamSpec          *pspec);
+static void       gimp_operation_set_alpha_set_property (GObject             *object,
+                                                         guint                property_id,
+                                                         const GValue        *value,
+                                                         GParamSpec          *pspec);
+
+static void       gimp_operation_set_alpha_prepare      (GeglOperation       *operation);
+static gboolean   gimp_operation_set_alpha_process      (GeglOperation       *operation,
+                                                         void                *in_buf,
+                                                         void                *aux_buf,
+                                                         void                *out_buf,
+                                                         glong                samples,
+                                                         const GeglRectangle *roi,
+                                                         gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationSetAlpha, gimp_operation_set_alpha,
+               GEGL_TYPE_OPERATION_POINT_COMPOSER)
+
+#define parent_class gimp_operation_set_alpha_parent_class
+
+
+static void
+gimp_operation_set_alpha_class_init (GimpOperationSetAlphaClass *klass)
+{
+  GObjectClass                    *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass              *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointComposerClass *point_class     = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_set_alpha_set_property;
+  object_class->get_property = gimp_operation_set_alpha_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:set-alpha",
+                                 "categories",  "color",
+                                 "description", "Set a buffer's alpha channel to a value",
+                                 NULL);
+
+  operation_class->prepare = gimp_operation_set_alpha_prepare;
+
+  point_class->process     = gimp_operation_set_alpha_process;
+
+  g_object_class_install_property (object_class, PROP_VALUE,
+                                   g_param_spec_double ("value",
+                                                        "Value",
+                                                        "The alpha value",
+                                                        0.0, 1.0, 1.0,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_set_alpha_init (GimpOperationSetAlpha *self)
+{
+}
+
+static void
+gimp_operation_set_alpha_get_property (GObject    *object,
+                                       guint       property_id,
+                                       GValue     *value,
+                                       GParamSpec *pspec)
+{
+  GimpOperationSetAlpha *self = GIMP_OPERATION_SET_ALPHA (object);
+
+  switch (property_id)
+    {
+    case PROP_VALUE:
+      g_value_set_double (value, self->value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_set_alpha_set_property (GObject      *object,
+                                       guint         property_id,
+                                       const GValue *value,
+                                       GParamSpec   *pspec)
+{
+  GimpOperationSetAlpha *self = GIMP_OPERATION_SET_ALPHA (object);
+
+  switch (property_id)
+    {
+    case PROP_VALUE:
+      self->value = g_value_get_double (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_set_alpha_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("RGBA float", space));
+  gegl_operation_set_format (operation, "aux",    babl_format_with_space ("Y float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("RGBA float", space));
+}
+
+static gboolean
+gimp_operation_set_alpha_process (GeglOperation       *operation,
+                                  void                *in_buf,
+                                  void                *aux_buf,
+                                  void                *out_buf,
+                                  glong                samples,
+                                  const GeglRectangle *roi,
+                                  gint                 level)
+{
+  GimpOperationSetAlpha *self = GIMP_OPERATION_SET_ALPHA (operation);
+  gfloat                *src  = in_buf;
+  gfloat                *aux  = aux_buf;
+  gfloat                *dest = out_buf;
+
+  if (aux)
+    {
+      while (samples--)
+        {
+          dest[RED]   = src[RED];
+          dest[GREEN] = src[GREEN];
+          dest[BLUE]  = src[BLUE];
+          dest[ALPHA] = self->value * *aux;
+
+          src  += 4;
+          aux  += 1;
+          dest += 4;
+        }
+    }
+  else
+    {
+      while (samples--)
+        {
+          dest[RED]   = src[RED];
+          dest[GREEN] = src[GREEN];
+          dest[BLUE]  = src[BLUE];
+          dest[ALPHA] = self->value;
+
+          src  += 4;
+          dest += 4;
+        }
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationsetalpha.h b/app/operations/gimpoperationsetalpha.h
new file mode 100644
index 0000000..741ae1e
--- /dev/null
+++ b/app/operations/gimpoperationsetalpha.h
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsetalpha.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SET_ALPHA_H__
+#define __GIMP_OPERATION_SET_ALPHA_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_SET_ALPHA            (gimp_operation_set_alpha_get_type ())
+#define GIMP_OPERATION_SET_ALPHA(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SET_ALPHA, GimpOperationSetAlpha))
+#define GIMP_OPERATION_SET_ALPHA_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SET_ALPHA, GimpOperationSetAlphaClass))
+#define GIMP_IS_OPERATION_SET_ALPHA(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SET_ALPHA))
+#define GIMP_IS_OPERATION_SET_ALPHA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SET_ALPHA))
+#define GIMP_OPERATION_SET_ALPHA_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SET_ALPHA, GimpOperationSetAlphaClass))
+
+
+typedef struct _GimpOperationSetAlpha      GimpOperationSetAlpha;
+typedef struct _GimpOperationSetAlphaClass GimpOperationSetAlphaClass;
+
+struct _GimpOperationSetAlpha
+{
+  GeglOperationPointComposer  parent_instance;
+
+  gdouble                     value;
+};
+
+struct _GimpOperationSetAlphaClass
+{
+  GeglOperationPointComposerClass  parent_class;
+};
+
+
+GType   gimp_operation_set_alpha_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SET_ALPHA_H__ */
diff --git a/app/operations/gimpoperationsettings.c b/app/operations/gimpoperationsettings.c
new file mode 100644
index 0000000..88a6ace
--- /dev/null
+++ b/app/operations/gimpoperationsettings.c
@@ -0,0 +1,320 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsettings.c
+ * Copyright (C) 2020 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimpdrawable.h"
+#include "core/gimpdrawablefilter.h"
+
+#include "gimpoperationsettings.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_CLIP,
+  PROP_REGION,
+  PROP_MODE,
+  PROP_OPACITY,
+  PROP_COLOR_MANAGED,
+  PROP_GAMMA_HACK
+};
+
+
+static void   gimp_operation_settings_get_property (GObject      *object,
+                                                    guint         property_id,
+                                                    GValue       *value,
+                                                    GParamSpec   *pspec);
+static void   gimp_operation_settings_set_property (GObject      *object,
+                                                    guint         property_id,
+                                                    const GValue *value,
+                                                    GParamSpec   *pspec);
+
+
+G_DEFINE_TYPE (GimpOperationSettings, gimp_operation_settings,
+               GIMP_TYPE_SETTINGS)
+
+#define parent_class gimp_operation_settings_parent_class
+
+
+static void
+gimp_operation_settings_class_init (GimpOperationSettingsClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->set_property = gimp_operation_settings_set_property;
+  object_class->get_property = gimp_operation_settings_get_property;
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_CLIP,
+                         "gimp-clip",
+                         _("Clipping"),
+                         _("How to clip"),
+                         GIMP_TYPE_TRANSFORM_RESIZE,
+                         GIMP_TRANSFORM_RESIZE_ADJUST,
+                         GIMP_PARAM_STATIC_STRINGS |
+                         GIMP_CONFIG_PARAM_DEFAULTS);
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_REGION,
+                         "gimp-region",
+                         NULL, NULL,
+                         GIMP_TYPE_FILTER_REGION,
+                         GIMP_FILTER_REGION_SELECTION,
+                         GIMP_PARAM_STATIC_STRINGS |
+                         GIMP_CONFIG_PARAM_DEFAULTS);
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_MODE,
+                         "gimp-mode",
+                         _("Mode"),
+                         NULL,
+                         GIMP_TYPE_LAYER_MODE,
+                         GIMP_LAYER_MODE_REPLACE,
+                         GIMP_PARAM_STATIC_STRINGS |
+                         GIMP_CONFIG_PARAM_DEFAULTS);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_OPACITY,
+                           "gimp-opacity",
+                           _("Opacity"),
+                           NULL,
+                           0.0, 1.0, 1.0,
+                           GIMP_PARAM_STATIC_STRINGS |
+                           GIMP_CONFIG_PARAM_DEFAULTS);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_COLOR_MANAGED,
+                            "gimp-color-managed",
+                            _("Color _managed"),
+                            NULL,
+                            FALSE,
+                            GIMP_PARAM_STATIC_STRINGS |
+                            GIMP_CONFIG_PARAM_DEFAULTS);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_GAMMA_HACK,
+                            "gimp-gamma-hack",
+                            "Gamma hack (temp hack, please ignore)",
+                            NULL,
+                            FALSE,
+                            GIMP_PARAM_STATIC_STRINGS |
+                            GIMP_CONFIG_PARAM_DEFAULTS);
+}
+
+static void
+gimp_operation_settings_init (GimpOperationSettings *settings)
+{
+}
+
+static void
+gimp_operation_settings_get_property (GObject    *object,
+                                      guint       property_id,
+                                      GValue     *value,
+                                      GParamSpec *pspec)
+{
+  GimpOperationSettings *settings = GIMP_OPERATION_SETTINGS (object);
+
+  switch (property_id)
+    {
+    case PROP_CLIP:
+      g_value_set_enum (value, settings->clip);
+      break;
+
+    case PROP_REGION:
+      g_value_set_enum (value, settings->region);
+      break;
+
+    case PROP_MODE:
+      g_value_set_enum (value, settings->mode);
+      break;
+
+    case PROP_OPACITY:
+      g_value_set_double (value, settings->opacity);
+      break;
+
+    case PROP_COLOR_MANAGED:
+      g_value_set_boolean (value, settings->color_managed);
+      break;
+
+    case PROP_GAMMA_HACK:
+      g_value_set_boolean (value, settings->gamma_hack);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_settings_set_property (GObject      *object,
+                                      guint         property_id,
+                                      const GValue *value,
+                                      GParamSpec   *pspec)
+{
+  GimpOperationSettings *settings = GIMP_OPERATION_SETTINGS (object);
+
+  switch (property_id)
+    {
+    case PROP_CLIP:
+      settings->clip = g_value_get_enum (value);
+      break;
+
+    case PROP_REGION:
+      settings->region = g_value_get_enum (value);
+      break;
+
+    case PROP_MODE:
+      settings->mode = g_value_get_enum (value);
+      break;
+
+    case PROP_OPACITY:
+      settings->opacity = g_value_get_double (value);
+      break;
+
+    case PROP_COLOR_MANAGED:
+      settings->color_managed = g_value_get_boolean (value);
+      break;
+
+    case PROP_GAMMA_HACK:
+      settings->gamma_hack = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+
+/*  public functions  */
+
+void
+gimp_operation_settings_sync_drawable_filter (GimpOperationSettings *settings,
+                                              GimpDrawableFilter    *filter)
+{
+  gboolean clip;
+
+  g_return_if_fail (GIMP_IS_OPERATION_SETTINGS (settings));
+  g_return_if_fail (GIMP_IS_DRAWABLE_FILTER (filter));
+
+  clip = settings->clip == GIMP_TRANSFORM_RESIZE_CLIP ||
+         ! babl_format_has_alpha (gimp_drawable_filter_get_format (filter));
+
+  gimp_drawable_filter_set_region        (filter, settings->region);
+  gimp_drawable_filter_set_clip          (filter, clip);
+  gimp_drawable_filter_set_mode          (filter,
+                                          settings->mode,
+                                          GIMP_LAYER_COLOR_SPACE_AUTO,
+                                          GIMP_LAYER_COLOR_SPACE_AUTO,
+                                          GIMP_LAYER_COMPOSITE_AUTO);
+  gimp_drawable_filter_set_opacity       (filter, settings->opacity);
+  gimp_drawable_filter_set_color_managed (filter, settings->color_managed);
+  gimp_drawable_filter_set_gamma_hack    (filter, settings->gamma_hack);
+}
+
+
+/*  protected functions  */
+
+static const gchar * const base_properties[] =
+{
+  "time",
+  "gimp-clip",
+  "gimp-region",
+  "gimp-mode",
+  "gimp-opacity",
+  "gimp-color-managed",
+  "gimp-gamma-hack"
+};
+
+gboolean
+gimp_operation_settings_config_serialize_base (GimpConfig       *config,
+                                               GimpConfigWriter *writer,
+                                               gpointer          data)
+{
+  gint i;
+
+  for (i = 0; i < G_N_ELEMENTS (base_properties); i++)
+    {
+      if (! gimp_config_serialize_property_by_name (config,
+                                                    base_properties[i],
+                                                    writer))
+        {
+          return FALSE;
+        }
+    }
+
+  return TRUE;
+}
+
+gboolean
+gimp_operation_settings_config_equal_base (GimpConfig *a,
+                                           GimpConfig *b)
+{
+  GimpOperationSettings *settings_a = GIMP_OPERATION_SETTINGS (a);
+  GimpOperationSettings *settings_b = GIMP_OPERATION_SETTINGS (b);
+
+  return settings_a->clip          == settings_b->clip          &&
+         settings_a->region        == settings_b->region        &&
+         settings_a->mode          == settings_b->mode          &&
+         settings_a->opacity       == settings_b->opacity       &&
+         settings_a->color_managed == settings_b->color_managed &&
+         settings_a->gamma_hack    == settings_b->gamma_hack;
+}
+
+void
+gimp_operation_settings_config_reset_base (GimpConfig *config)
+{
+  gint i;
+
+  g_object_freeze_notify (G_OBJECT (config));
+
+  for (i = 0; i < G_N_ELEMENTS (base_properties); i++)
+    gimp_config_reset_property (G_OBJECT (config), base_properties[i]);
+
+  g_object_thaw_notify (G_OBJECT (config));
+}
+
+gboolean
+gimp_operation_settings_config_copy_base (GimpConfig  *src,
+                                          GimpConfig  *dest,
+                                          GParamFlags  flags)
+{
+  gint i;
+
+  g_object_freeze_notify (G_OBJECT (dest));
+
+  for (i = 0; i < G_N_ELEMENTS (base_properties); i++)
+    {
+      g_object_unref (g_object_bind_property (src,  base_properties[i],
+                                              dest, base_properties[i],
+                                              G_BINDING_SYNC_CREATE));
+    }
+
+  g_object_thaw_notify (G_OBJECT (dest));
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationsettings.h b/app/operations/gimpoperationsettings.h
new file mode 100644
index 0000000..a081fce
--- /dev/null
+++ b/app/operations/gimpoperationsettings.h
@@ -0,0 +1,75 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsettings.h
+ * Copyright (C) 2020 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SETTINGS_H__
+#define __GIMP_OPERATION_SETTINGS_H__
+
+
+#include "core/gimpsettings.h"
+
+
+#define GIMP_TYPE_OPERATION_SETTINGS            (gimp_operation_settings_get_type ())
+#define GIMP_OPERATION_SETTINGS(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SETTINGS, GimpOperationSettings))
+#define GIMP_OPERATION_SETTINGS_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SETTINGS, GimpOperationSettingsClass))
+#define GIMP_IS_OPERATION_SETTINGS(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SETTINGS))
+#define GIMP_IS_OPERATION_SETTINGS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SETTINGS))
+#define GIMP_OPERATION_SETTINGS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SETTINGS, GimpOperationSettingsClass))
+
+
+typedef struct _GimpOperationSettingsClass GimpOperationSettingsClass;
+
+struct _GimpOperationSettings
+{
+  GimpSettings         parent_instance;
+
+  GimpTransformResize  clip;
+  GimpFilterRegion     region;
+  GimpLayerMode        mode;
+  gdouble              opacity;
+  gboolean             color_managed;
+  gboolean             gamma_hack;
+};
+
+struct _GimpOperationSettingsClass
+{
+  GimpSettingsClass  parent_class;
+};
+
+
+GType      gimp_operation_settings_get_type              (void) G_GNUC_CONST;
+
+void       gimp_operation_settings_sync_drawable_filter  (GimpOperationSettings *settings,
+                                                          GimpDrawableFilter    *filter);
+
+
+/*  protected  */
+
+gboolean   gimp_operation_settings_config_serialize_base (GimpConfig            *config,
+                                                          GimpConfigWriter      *writer,
+                                                          gpointer               data);
+gboolean   gimp_operation_settings_config_equal_base     (GimpConfig            *a,
+                                                          GimpConfig            *b);
+void       gimp_operation_settings_config_reset_base     (GimpConfig            *config);
+gboolean   gimp_operation_settings_config_copy_base      (GimpConfig            *src,
+                                                          GimpConfig            *dest,
+                                                          GParamFlags            flags);
+
+
+#endif /* __GIMP_OPERATION_SETTINGS_H__ */
diff --git a/app/operations/gimpoperationshrink.c b/app/operations/gimpoperationshrink.c
new file mode 100644
index 0000000..c862edb
--- /dev/null
+++ b/app/operations/gimpoperationshrink.c
@@ -0,0 +1,443 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationshrink.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationshrink.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_RADIUS_X,
+  PROP_RADIUS_Y,
+  PROP_EDGE_LOCK
+};
+
+
+static void     gimp_operation_shrink_get_property (GObject             *object,
+                                                    guint                property_id,
+                                                    GValue              *value,
+                                                    GParamSpec          *pspec);
+static void     gimp_operation_shrink_set_property (GObject             *object,
+                                                    guint                property_id,
+                                                    const GValue        *value,
+                                                    GParamSpec          *pspec);
+
+static void          gimp_operation_shrink_prepare (GeglOperation       *operation);
+static GeglRectangle
+     gimp_operation_shrink_get_required_for_output (GeglOperation       *self,
+                                                    const gchar         *input_pad,
+                                                    const GeglRectangle *roi);
+static GeglRectangle
+           gimp_operation_shrink_get_cached_region (GeglOperation       *self,
+                                                    const GeglRectangle *roi);
+
+static gboolean      gimp_operation_shrink_process (GeglOperation       *operation,
+                                                    GeglBuffer          *input,
+                                                    GeglBuffer          *output,
+                                                    const GeglRectangle *roi,
+                                                    gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationShrink, gimp_operation_shrink,
+               GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_shrink_parent_class
+
+
+static void
+gimp_operation_shrink_class_init (GimpOperationShrinkClass *klass)
+{
+  GObjectClass             *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass       *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationFilterClass *filter_class    = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  object_class->set_property   = gimp_operation_shrink_set_property;
+  object_class->get_property   = gimp_operation_shrink_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:shrink",
+                                 "categories",  "gimp",
+                                 "description", "GIMP Shrink operation",
+                                 NULL);
+
+  operation_class->prepare                 = gimp_operation_shrink_prepare;
+  operation_class->get_required_for_output = gimp_operation_shrink_get_required_for_output;
+  operation_class->get_cached_region       = gimp_operation_shrink_get_cached_region;
+  operation_class->threaded                = FALSE;
+
+  filter_class->process                    = gimp_operation_shrink_process;
+
+  g_object_class_install_property (object_class, PROP_RADIUS_X,
+                                   g_param_spec_int ("radius-x",
+                                                     "Radius X",
+                                                     "Shrink radius in X diection",
+                                                     1, 2342, 1,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_RADIUS_Y,
+                                   g_param_spec_int ("radius-y",
+                                                     "Radius Y",
+                                                     "Shrink radius in Y diection",
+                                                     1, 2342, 1,
+                                                     G_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_EDGE_LOCK,
+                                   g_param_spec_boolean ("edge-lock",
+                                                         "Edge Lock",
+                                                         "Shrink from border",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE |
+                                                         G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_shrink_init (GimpOperationShrink *self)
+{
+}
+
+static void
+gimp_operation_shrink_get_property (GObject    *object,
+                                    guint       property_id,
+                                    GValue     *value,
+                                    GParamSpec *pspec)
+{
+ GimpOperationShrink *self = GIMP_OPERATION_SHRINK (object);
+
+  switch (property_id)
+    {
+    case PROP_RADIUS_X:
+      g_value_set_int (value, self->radius_x);
+      break;
+
+    case PROP_RADIUS_Y:
+      g_value_set_int (value, self->radius_y);
+      break;
+
+    case PROP_EDGE_LOCK:
+      g_value_set_boolean (value, self->edge_lock);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_shrink_set_property (GObject      *object,
+                                    guint         property_id,
+                                    const GValue *value,
+                                    GParamSpec   *pspec)
+{
+  GimpOperationShrink *self = GIMP_OPERATION_SHRINK (object);
+
+  switch (property_id)
+    {
+    case PROP_RADIUS_X:
+      self->radius_x = g_value_get_int (value);
+      break;
+
+    case PROP_RADIUS_Y:
+      self->radius_y = g_value_get_int (value);
+      break;
+
+    case PROP_EDGE_LOCK:
+      self->edge_lock = g_value_get_boolean (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_shrink_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("Y float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("Y float", space));
+}
+
+static GeglRectangle
+gimp_operation_shrink_get_required_for_output (GeglOperation       *self,
+                                               const gchar         *input_pad,
+                                               const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static GeglRectangle
+gimp_operation_shrink_get_cached_region (GeglOperation       *self,
+                                         const GeglRectangle *roi)
+{
+  return *gegl_operation_source_get_bounding_box (self, "input");
+}
+
+static void
+compute_border (gint16  *circ,
+                guint16  xradius,
+                guint16  yradius)
+{
+  gint32  i;
+  gint32  diameter = xradius * 2 + 1;
+  gdouble tmp;
+
+  for (i = 0; i < diameter; i++)
+    {
+      if (i > xradius)
+        tmp = (i - xradius) - 0.5;
+      else if (i < xradius)
+        tmp = (xradius - i) - 0.5;
+      else
+        tmp = 0.0;
+
+      circ[i] = RINT (yradius /
+                      (gdouble) xradius * sqrt (SQR (xradius) - SQR (tmp)));
+    }
+}
+
+static inline void
+rotate_pointers (gfloat  **p,
+                 guint32   n)
+{
+  guint32  i;
+  gfloat  *tmp;
+
+  tmp = p[0];
+
+  for (i = 0; i < n - 1; i++)
+    p[i] = p[i + 1];
+
+  p[i] = tmp;
+}
+
+static gboolean
+gimp_operation_shrink_process (GeglOperation       *operation,
+                               GeglBuffer          *input,
+                               GeglBuffer          *output,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  /* Pretty much the same as fatten_region only different.
+   * Blame all bugs in this function on jaycox@gimp.org
+   *
+   * If edge_lock is true we assume that pixels outside the region we
+   * are passed are identical to the edge pixels.  If edge_lock is
+   * false, we assume that pixels outside the region are 0
+   */
+  GimpOperationShrink *self          = GIMP_OPERATION_SHRINK (operation);
+  const Babl          *input_format  = babl_format ("Y float");
+  const Babl          *output_format = babl_format ("Y float");
+  gint32               i, j, x, y;
+  gfloat             **buf;  /* caches the the region's pixels */
+  gfloat              *out;  /* holds the new scan line we are computing */
+  gfloat             **max;  /* caches the smallest values for each column */
+  gint16              *circ; /* holds the y coords of the filter's mask */
+  gfloat               last_max;
+  gint16               last_index;
+  gfloat              *buffer;
+  gint                 buffer_size;
+
+  max = g_new (gfloat *, roi->width + 2 * self->radius_x);
+  buf = g_new (gfloat *, self->radius_y + 1);
+
+  for (i = 0; i < self->radius_y + 1; i++)
+    buf[i] = g_new (gfloat, roi->width);
+
+  buffer_size = (roi->width+ 2 * self->radius_x + 1) * (self->radius_y + 1);
+  buffer = g_new (gfloat, buffer_size);
+
+  if (self->edge_lock)
+    {
+      for (i = 0; i < buffer_size; i++)
+        buffer[i] = 1.0;
+    }
+  else
+    {
+      memset (buffer, 0, buffer_size * sizeof (gfloat));
+    }
+
+  for (i = 0; i < roi->width + 2 * self->radius_x; i++)
+    {
+      if (i < self->radius_x)
+        {
+          if (self->edge_lock)
+            max[i] = buffer;
+          else
+            max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x)];
+        }
+      else if (i < roi->width + self->radius_x)
+        {
+          max[i] = &buffer[(self->radius_y + 1) * (i - self->radius_x)];
+        }
+      else
+        {
+          if (self->edge_lock)
+            max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x - 1)];
+          else
+            max[i] = &buffer[(self->radius_y + 1) * (roi->width + self->radius_x)];
+        }
+    }
+
+  if (! self->edge_lock)
+    for (j = 0 ; j < self->radius_y + 1; j++)
+      max[0][j] = 0.0;
+
+  /* offset the max pointer by self->radius_x so the range of the
+   * array is [-self->radius_x] to [roi->width + self->radius_x]
+   */
+  max += self->radius_x;
+
+  out = g_new (gfloat, roi->width);
+
+  circ = g_new (gint16, 2 * self->radius_x + 1);
+  compute_border (circ, self->radius_x, self->radius_y);
+
+ /* offset the circ pointer by self->radius_x so the range of the
+  * array is [-self->radius_x] to [self->radius_x]
+  */
+  circ += self->radius_x;
+
+  for (i = 0; i < self->radius_y && i < roi->height; i++) /* load top of image */
+    gegl_buffer_get (input,
+                     GEGL_RECTANGLE (roi->x, roi->y + i,
+                                     roi->width, 1),
+                     1.0, input_format, buf[i + 1],
+                     GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  if (self->edge_lock)
+    memcpy (buf[0], buf[1], roi->width * sizeof (gfloat));
+  else
+    memset (buf[0], 0, roi->width * sizeof (gfloat));
+
+  for (x = 0; x < roi->width; x++) /* set up max for top of image */
+    {
+      max[x][0] = buf[0][x];
+
+      for (j = 1; j < self->radius_y + 1; j++)
+        max[x][j] = MIN (buf[j][x], max[x][j - 1]);
+    }
+
+  for (y = 0; y < roi->height; y++)
+    {
+      rotate_pointers (buf, self->radius_y + 1);
+
+      if (y < roi->height - self->radius_y)
+        gegl_buffer_get (input,
+                         GEGL_RECTANGLE (roi->x,  roi->y + y + self->radius_y,
+                                         roi->width, 1),
+                         1.0, input_format, buf[self->radius_y],
+                         GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+      else if (self->edge_lock)
+        memcpy (buf[self->radius_y], buf[self->radius_y - 1],
+                roi->width * sizeof (gfloat));
+      else
+        memset (buf[self->radius_y], 0, roi->width * sizeof (gfloat));
+
+      for (x = 0 ; x < roi->width; x++) /* update max array */
+        {
+          for (i = self->radius_y; i > 0; i--)
+            max[x][i] = MIN (MIN (max[x][i - 1], buf[i - 1][x]), buf[i][x]);
+
+          max[x][0] = buf[0][x];
+        }
+
+      last_max =  max[0][circ[-1]];
+      last_index = 0;
+
+      for (x = 0 ; x < roi->width; x++) /* render scan line */
+        {
+          last_index--;
+
+          if (last_index >= 0)
+            {
+              if (last_max <= 0.0)
+                {
+                  out[x] = 0.0;
+                }
+              else
+                {
+                  last_max = 1.0;
+
+                  for (i = self->radius_x; i >= 0; i--)
+                    if (last_max > max[x + i][circ[i]])
+                      {
+                        last_max = max[x + i][circ[i]];
+                        last_index = i;
+                      }
+
+                  out[x] = last_max;
+                }
+            }
+          else
+            {
+              last_index = self->radius_x;
+              last_max = max[x + self->radius_x][circ[self->radius_x]];
+
+              for (i = self->radius_x - 1; i >= -self->radius_x; i--)
+                if (last_max > max[x + i][circ[i]])
+                  {
+                    last_max = max[x + i][circ[i]];
+                    last_index = i;
+                  }
+
+              out[x] = last_max;
+            }
+        }
+
+      gegl_buffer_set (output,
+                       GEGL_RECTANGLE (roi->x, roi->y + y,
+                                       roi->width, 1),
+                       0, output_format, out,
+                       GEGL_AUTO_ROWSTRIDE);
+    }
+
+  /* undo the offsets to the pointers so we can free the malloced memory */
+  circ -= self->radius_x;
+  max -= self->radius_x;
+
+  /* free the memory */
+  g_free (circ);
+  g_free (buffer);
+  g_free (max);
+
+  for (i = 0; i < self->radius_y + 1; i++)
+    g_free (buf[i]);
+
+  g_free (buf);
+  g_free (out);
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationshrink.h b/app/operations/gimpoperationshrink.h
new file mode 100644
index 0000000..1ba58e6
--- /dev/null
+++ b/app/operations/gimpoperationshrink.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationshrink.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SHRINK_H__
+#define __GIMP_OPERATION_SHRINK_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_SHRINK            (gimp_operation_shrink_get_type ())
+#define GIMP_OPERATION_SHRINK(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SHRINK, GimpOperationShrink))
+#define GIMP_OPERATION_SHRINK_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SHRINK, GimpOperationShrinkClass))
+#define GIMP_IS_OPERATION_SHRINK(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SHRINK))
+#define GIMP_IS_OPERATION_SHRINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SHRINK))
+#define GIMP_OPERATION_SHRINK_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SHRINK, GimpOperationShrinkClass))
+
+
+typedef struct _GimpOperationShrink      GimpOperationShrink;
+typedef struct _GimpOperationShrinkClass GimpOperationShrinkClass;
+
+struct _GimpOperationShrink
+{
+  GeglOperationFilter  parent_instance;
+
+  gint                 radius_x;
+  gint                 radius_y;
+  gboolean             edge_lock;
+};
+
+struct _GimpOperationShrinkClass
+{
+  GeglOperationFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_shrink_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SHRINK_H__ */
diff --git a/app/operations/gimpoperationthreshold.c b/app/operations/gimpoperationthreshold.c
new file mode 100644
index 0000000..e33a9ec
--- /dev/null
+++ b/app/operations/gimpoperationthreshold.c
@@ -0,0 +1,232 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationthreshold.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationthreshold.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_CHANNEL,
+  PROP_LOW,
+  PROP_HIGH
+};
+
+
+static void     gimp_operation_threshold_get_property (GObject      *object,
+                                                       guint         property_id,
+                                                       GValue       *value,
+                                                       GParamSpec   *pspec);
+static void     gimp_operation_threshold_set_property (GObject      *object,
+                                                       guint         property_id,
+                                                       const GValue *value,
+                                                       GParamSpec   *pspec);
+
+static gboolean gimp_operation_threshold_process (GeglOperation       *operation,
+                                                  void                *in_buf,
+                                                  void                *out_buf,
+                                                  glong                samples,
+                                                  const GeglRectangle *roi,
+                                                  gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationThreshold, gimp_operation_threshold,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_threshold_parent_class
+
+
+static void
+gimp_operation_threshold_class_init (GimpOperationThresholdClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_threshold_set_property;
+  object_class->get_property = gimp_operation_threshold_get_property;
+
+  point_class->process       = gimp_operation_threshold_process;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:threshold",
+                                 "categories",  "color",
+                                 "description", _("Reduce image to two colors using a threshold"),
+                                 NULL);
+
+  GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
+                         "channel",
+                         _("Channel"),
+                         NULL,
+                         GIMP_TYPE_HISTOGRAM_CHANNEL,
+                         GIMP_HISTOGRAM_VALUE,
+                         GIMP_PARAM_STATIC_STRINGS);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW,
+                           "low",
+                           _("Low threshold"),
+                           NULL,
+                           0.0, 1.0, 0.5,
+                           GIMP_PARAM_STATIC_STRINGS);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH,
+                           "high",
+                           _("High threshold"),
+                           NULL,
+                           0.0, 1.0, 1.0,
+                           GIMP_PARAM_STATIC_STRINGS);
+}
+
+static void
+gimp_operation_threshold_init (GimpOperationThreshold *self)
+{
+}
+
+static void
+gimp_operation_threshold_get_property (GObject    *object,
+                                       guint       property_id,
+                                       GValue     *value,
+                                       GParamSpec *pspec)
+{
+  GimpOperationThreshold *self = GIMP_OPERATION_THRESHOLD (object);
+
+  switch (property_id)
+    {
+    case PROP_CHANNEL:
+      g_value_set_enum (value, self->channel);
+      break;
+
+    case PROP_LOW:
+      g_value_set_double (value, self->low);
+      break;
+
+    case PROP_HIGH:
+      g_value_set_double (value, self->high);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_threshold_set_property (GObject      *object,
+                                       guint         property_id,
+                                       const GValue *value,
+                                       GParamSpec   *pspec)
+{
+  GimpOperationThreshold *self = GIMP_OPERATION_THRESHOLD (object);
+
+  switch (property_id)
+    {
+    case PROP_CHANNEL:
+      self->channel = g_value_get_enum (value);
+      break;
+
+    case PROP_LOW:
+      self->low = g_value_get_double (value);
+      break;
+
+    case PROP_HIGH:
+      self->high = g_value_get_double (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+ static gboolean
+gimp_operation_threshold_process (GeglOperation       *operation,
+                                  void                *in_buf,
+                                  void                *out_buf,
+                                  glong                samples,
+                                  const GeglRectangle *roi,
+                                  gint                 level)
+{
+  GimpOperationThreshold *threshold = GIMP_OPERATION_THRESHOLD (operation);
+  gfloat                 *src       = in_buf;
+  gfloat                 *dest      = out_buf;
+
+  while (samples--)
+    {
+      gfloat value = 0.0;
+
+      switch (threshold->channel)
+        {
+        case GIMP_HISTOGRAM_VALUE:
+          value = MAX (src[RED], src[GREEN]);
+          value = MAX (value, src[BLUE]);
+          break;
+
+        case GIMP_HISTOGRAM_RED:
+          value = src[RED];
+          break;
+
+        case GIMP_HISTOGRAM_GREEN:
+          value = src[GREEN];
+          break;
+
+        case GIMP_HISTOGRAM_BLUE:
+          value = src[BLUE];
+          break;
+
+        case GIMP_HISTOGRAM_ALPHA:
+          value = src[ALPHA];
+          break;
+
+        case GIMP_HISTOGRAM_RGB:
+          value = MIN (src[RED], src[GREEN]);
+          value = MIN (value, src[BLUE]);
+          break;
+
+        case GIMP_HISTOGRAM_LUMINANCE:
+          value = GIMP_RGB_LUMINANCE (src[RED], src[GREEN], src[BLUE]);
+          break;
+        }
+
+      value = (value >= threshold->low && value <= threshold->high) ? 1.0 : 0.0;
+
+      dest[RED]   = value;
+      dest[GREEN] = value;
+      dest[BLUE]  = value;
+      dest[ALPHA] = src[ALPHA];
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationthreshold.h b/app/operations/gimpoperationthreshold.h
new file mode 100644
index 0000000..dcdf52b
--- /dev/null
+++ b/app/operations/gimpoperationthreshold.h
@@ -0,0 +1,57 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationthreshold.h
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_THRESHOLD_H__
+#define __GIMP_OPERATION_THRESHOLD_H__
+
+
+#include "gimpoperationpointfilter.h"
+
+
+#define GIMP_TYPE_OPERATION_THRESHOLD            (gimp_operation_threshold_get_type ())
+#define GIMP_OPERATION_THRESHOLD(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_THRESHOLD, GimpOperationThreshold))
+#define GIMP_OPERATION_THRESHOLD_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_THRESHOLD, GimpOperationThresholdClass))
+#define GIMP_IS_OPERATION_THRESHOLD(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_THRESHOLD))
+#define GIMP_IS_OPERATION_THRESHOLD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_THRESHOLD))
+#define GIMP_OPERATION_THRESHOLD_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_THRESHOLD, GimpOperationThresholdClass))
+
+
+typedef struct _GimpOperationThreshold      GimpOperationThreshold;
+typedef struct _GimpOperationThresholdClass GimpOperationThresholdClass;
+
+struct _GimpOperationThreshold
+{
+  GimpOperationPointFilter  parent_instance;
+
+  GimpHistogramChannel      channel;
+  gdouble                   low;
+  gdouble                   high;
+};
+
+struct _GimpOperationThresholdClass
+{
+  GimpOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_threshold_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_THRESHOLD_H__ */
diff --git a/app/operations/gimpoperationthresholdalpha.c b/app/operations/gimpoperationthresholdalpha.c
new file mode 100644
index 0000000..94cbaf5
--- /dev/null
+++ b/app/operations/gimpoperationthresholdalpha.c
@@ -0,0 +1,178 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationthresholdalpha.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Ported from the threshold-alpha plug-in
+ * Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp>
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "operations-types.h"
+
+#include "gimpoperationthresholdalpha.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_VALUE
+};
+
+
+static void       gimp_operation_threshold_alpha_get_property (GObject             *object,
+                                                               guint                property_id,
+                                                               GValue              *value,
+                                                               GParamSpec          *pspec);
+static void       gimp_operation_threshold_alpha_set_property (GObject             *object,
+                                                               guint                property_id,
+                                                               const GValue        *value,
+                                                               GParamSpec          *pspec);
+
+static void       gimp_operation_threshold_alpha_prepare      (GeglOperation       *operation);
+static gboolean   gimp_operation_threshold_alpha_process      (GeglOperation       *operation,
+                                                               void                *in_buf,
+                                                               void                *out_buf,
+                                                               glong                samples,
+                                                               const GeglRectangle *roi,
+                                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationThresholdAlpha, gimp_operation_threshold_alpha,
+               GEGL_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_threshold_alpha_parent_class
+
+
+static void
+gimp_operation_threshold_alpha_class_init (GimpOperationThresholdAlphaClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->set_property = gimp_operation_threshold_alpha_set_property;
+  object_class->get_property = gimp_operation_threshold_alpha_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:threshold-alpha",
+                                 "categories",  "color",
+                                 "description",
+                                 _("Make transparency all-or-nothing, by "
+                                   "thresholding the alpha channel to a value"),
+                                 NULL);
+
+  operation_class->prepare = gimp_operation_threshold_alpha_prepare;
+
+  point_class->process     = gimp_operation_threshold_alpha_process;
+
+  g_object_class_install_property (object_class, PROP_VALUE,
+                                   g_param_spec_double ("value",
+                                                        _("Value"),
+                                                        _("The alpha value"),
+                                                        0.0, 1.0, 0.5,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_threshold_alpha_init (GimpOperationThresholdAlpha *self)
+{
+}
+
+static void
+gimp_operation_threshold_alpha_get_property (GObject    *object,
+                                             guint       property_id,
+                                             GValue     *value,
+                                             GParamSpec *pspec)
+{
+  GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (object);
+
+  switch (property_id)
+    {
+    case PROP_VALUE:
+      g_value_set_double (value, self->value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_threshold_alpha_set_property (GObject      *object,
+                                             guint         property_id,
+                                             const GValue *value,
+                                             GParamSpec   *pspec)
+{
+  GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (object);
+
+  switch (property_id)
+    {
+    case PROP_VALUE:
+      self->value = g_value_get_double (value);
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_threshold_alpha_prepare (GeglOperation *operation)
+{
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("RGBA float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("RGBA float", space));
+}
+
+static gboolean
+gimp_operation_threshold_alpha_process (GeglOperation       *operation,
+                                        void                *in_buf,
+                                        void                *out_buf,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (operation);
+  gfloat                      *src  = in_buf;
+  gfloat                      *dest = out_buf;
+
+  while (samples--)
+    {
+      dest[RED]   = src[RED];
+      dest[GREEN] = src[GREEN];
+      dest[BLUE]  = src[BLUE];
+
+      if (src[ALPHA] > self->value)
+        dest[ALPHA] = 1.0;
+      else
+        dest[ALPHA] = 0.0;
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/gimpoperationthresholdalpha.h b/app/operations/gimpoperationthresholdalpha.h
new file mode 100644
index 0000000..0339289
--- /dev/null
+++ b/app/operations/gimpoperationthresholdalpha.h
@@ -0,0 +1,56 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationthresholdalpha.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_THRESHOLD_ALPHA_H__
+#define __GIMP_OPERATION_THRESHOLD_ALPHA_H__
+
+
+#include <gegl-plugin.h>
+#include <operation/gegl-operation-point-filter.h>
+
+
+#define GIMP_TYPE_OPERATION_THRESHOLD_ALPHA            (gimp_operation_threshold_alpha_get_type ())
+#define GIMP_OPERATION_THRESHOLD_ALPHA(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_THRESHOLD_ALPHA, GimpOperationThresholdAlpha))
+#define GIMP_OPERATION_THRESHOLD_ALPHA_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_THRESHOLD_ALPHA, GimpOperationThresholdAlphaClass))
+#define GIMP_IS_OPERATION_THRESHOLD_ALPHA(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_THRESHOLD_ALPHA))
+#define GIMP_IS_OPERATION_THRESHOLD_ALPHA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_THRESHOLD_ALPHA))
+#define GIMP_OPERATION_THRESHOLD_ALPHA_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_THRESHOLD_ALPHA, GimpOperationThresholdAlphaClass))
+
+
+typedef struct _GimpOperationThresholdAlpha      GimpOperationThresholdAlpha;
+typedef struct _GimpOperationThresholdAlphaClass GimpOperationThresholdAlphaClass;
+
+struct _GimpOperationThresholdAlpha
+{
+  GeglOperationPointFilter  parent_instance;
+
+  gdouble                   value;
+};
+
+struct _GimpOperationThresholdAlphaClass
+{
+  GeglOperationPointFilterClass  parent_class;
+};
+
+
+GType   gimp_operation_threshold_alpha_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_THRESHOLD_ALPHA_H__ */
diff --git a/app/operations/layer-modes-legacy/Makefile.am b/app/operations/layer-modes-legacy/Makefile.am
new file mode 100644
index 0000000..b8241da
--- /dev/null
+++ b/app/operations/layer-modes-legacy/Makefile.am
@@ -0,0 +1,54 @@
+## Process this file with automake to produce Makefile.in
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-Layer-Modes-Legacy\"	\
+	-I$(top_builddir)				\
+	-I$(top_srcdir)					\
+	-I$(top_builddir)/app				\
+	-I$(top_srcdir)/app				\
+	$(CAIRO_CFLAGS)					\
+	$(GEGL_CFLAGS)					\
+	$(GDK_PIXBUF_CFLAGS)				\
+	-I$(includedir)
+
+noinst_LIBRARIES = \
+	libapplayermodeslegacy.a
+
+libapplayermodeslegacy_a_SOURCES = \
+	gimpoperationadditionlegacy.c		\
+	gimpoperationadditionlegacy.h		\
+	gimpoperationburnlegacy.c		\
+	gimpoperationburnlegacy.h		\
+	gimpoperationdarkenonlylegacy.c		\
+	gimpoperationdarkenonlylegacy.h		\
+	gimpoperationdifferencelegacy.c		\
+	gimpoperationdifferencelegacy.h		\
+	gimpoperationdividelegacy.c		\
+	gimpoperationdividelegacy.h		\
+	gimpoperationdodgelegacy.c		\
+	gimpoperationdodgelegacy.h		\
+	gimpoperationgrainextractlegacy.c	\
+	gimpoperationgrainextractlegacy.h	\
+	gimpoperationgrainmergelegacy.c		\
+	gimpoperationgrainmergelegacy.h		\
+	gimpoperationhardlightlegacy.c		\
+	gimpoperationhardlightlegacy.h		\
+	gimpoperationhslcolorlegacy.c		\
+	gimpoperationhslcolorlegacy.h		\
+	gimpoperationhsvhuelegacy.c		\
+	gimpoperationhsvhuelegacy.h		\
+	gimpoperationhsvsaturationlegacy.c	\
+	gimpoperationhsvsaturationlegacy.h	\
+	gimpoperationhsvvaluelegacy.c		\
+	gimpoperationhsvvaluelegacy.h		\
+	gimpoperationlightenonlylegacy.c	\
+	gimpoperationlightenonlylegacy.h	\
+	gimpoperationmultiplylegacy.c		\
+	gimpoperationmultiplylegacy.h		\
+	gimpoperationscreenlegacy.c		\
+	gimpoperationscreenlegacy.h		\
+	gimpoperationsoftlightlegacy.c		\
+	gimpoperationsoftlightlegacy.h		\
+	gimpoperationsubtractlegacy.c		\
+	gimpoperationsubtractlegacy.h
+
diff --git a/app/operations/layer-modes-legacy/Makefile.in b/app/operations/layer-modes-legacy/Makefile.in
new file mode 100644
index 0000000..246bfa6
--- /dev/null
+++ b/app/operations/layer-modes-legacy/Makefile.in
@@ -0,0 +1,1037 @@
+# Makefile.in generated by automake 1.16.2 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+
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+  if $(am__is_gnu_make); then \
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+am_libapplayermodeslegacy_a_OBJECTS =  \
+	gimpoperationadditionlegacy.$(OBJEXT) \
+	gimpoperationburnlegacy.$(OBJEXT) \
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+	gimpoperationdifferencelegacy.$(OBJEXT) \
+	gimpoperationdividelegacy.$(OBJEXT) \
+	gimpoperationdodgelegacy.$(OBJEXT) \
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+	gimpoperationscreenlegacy.$(OBJEXT) \
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+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
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+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LIBRARIES)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/gimpoperationadditionlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationburnlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdarkenonlylegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdifferencelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdividelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdodgelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationgrainextractlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationgrainmergelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhardlightlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhslcolorlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhsvhuelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhsvsaturationlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhsvvaluelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationlightenonlylegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationmultiplylegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationscreenlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsoftlightlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsubtractlegacy.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
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+
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+install-html-am:
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+
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+
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+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/gimpoperationadditionlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationburnlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdarkenonlylegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdifferencelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdividelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationdodgelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationgrainextractlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationgrainmergelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhardlightlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhslcolorlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhsvhuelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhsvsaturationlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationhsvvaluelegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationlightenonlylegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationmultiplylegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationscreenlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsoftlightlegacy.Po
+	-rm -f ./$(DEPDIR)/gimpoperationsubtractlegacy.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
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+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.c b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.c
new file mode 100644
index 0000000..02992f2
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.c
@@ -0,0 +1,126 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationadditionmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationadditionlegacy.h"
+
+
+static gboolean   gimp_operation_addition_legacy_process (GeglOperation       *op,
+                                                          void                *in,
+                                                          void                *layer,
+                                                          void                *mask,
+                                                          void                *out,
+                                                          glong                samples,
+                                                          const GeglRectangle *roi,
+                                                          gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationAdditionLegacy, gimp_operation_addition_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_addition_legacy_class_init (GimpOperationAdditionLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:addition-legacy",
+                                 "description", "GIMP addition mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_addition_legacy_process;
+}
+
+static void
+gimp_operation_addition_legacy_init (GimpOperationAdditionLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_addition_legacy_process (GeglOperation       *op,
+                                        void                *in_p,
+                                        void                *layer_p,
+                                        void                *mask_p,
+                                        void                *out_p,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (has_mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] + layer[b];
+              comp = CLAMP (comp, 0.0f, 1.0f);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (has_mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.h b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.h
new file mode 100644
index 0000000..7f9df60
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationadditionlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationadditionlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_ADDITION_LEGACY_H__
+#define __GIMP_OPERATION_ADDITION_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_ADDITION_LEGACY            (gimp_operation_addition_legacy_get_type ())
+#define GIMP_OPERATION_ADDITION_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_ADDITION_LEGACY, GimpOperationAdditionLegacy))
+#define GIMP_OPERATION_ADDITION_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_ADDITION_LEGACY, GimpOperationAdditionLegacyClass))
+#define GIMP_IS_OPERATION_ADDITION_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_ADDITION_LEGACY))
+#define GIMP_IS_OPERATION_ADDITION_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_ADDITION_LEGACY))
+#define GIMP_OPERATION_ADDITION_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_ADDITION_LEGACY, GimpOperationAdditionLegacyClass))
+
+
+typedef struct _GimpOperationAdditionLegacy      GimpOperationAdditionLegacy;
+typedef struct _GimpOperationAdditionLegacyClass GimpOperationAdditionLegacyClass;
+
+struct _GimpOperationAdditionLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationAdditionLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_addition_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_ADDITION_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationburnlegacy.c b/app/operations/layer-modes-legacy/gimpoperationburnlegacy.c
new file mode 100644
index 0000000..5511b69
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationburnlegacy.c
@@ -0,0 +1,128 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationburnmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationburnlegacy.h"
+
+
+static gboolean   gimp_operation_burn_legacy_process (GeglOperation       *op,
+                                                      void                *in,
+                                                      void                *layer,
+                                                      void                *mask,
+                                                      void                *out,
+                                                      glong                samples,
+                                                      const GeglRectangle *roi,
+                                                      gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationBurnLegacy, gimp_operation_burn_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_burn_legacy_class_init (GimpOperationBurnLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:burn-legacy",
+                                 "description", "GIMP burn mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_burn_legacy_process;
+}
+
+static void
+gimp_operation_burn_legacy_init (GimpOperationBurnLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_burn_legacy_process (GeglOperation       *op,
+                                    void                *in_p,
+                                    void                *layer_p,
+                                    void                *mask_p,
+                                    void                *out_p,
+                                    glong                samples,
+                                    const GeglRectangle *roi,
+                                    gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = 1.0f - (1.0f - in[b]) / layer[b];
+              /* The CLAMP macro is deliberately inlined and
+               * written to map comp == NAN (0 / 0) -> 1
+               */
+              comp = comp < 0.0f ? 0.0f : comp < 1.0f ? comp : 1.0f;
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationburnlegacy.h b/app/operations/layer-modes-legacy/gimpoperationburnlegacy.h
new file mode 100644
index 0000000..dc13e3f
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationburnlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationburnlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_BURN_LEGACY_H__
+#define __GIMP_OPERATION_BURN_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_BURN_LEGACY            (gimp_operation_burn_legacy_get_type ())
+#define GIMP_OPERATION_BURN_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_BURN_LEGACY, GimpOperationBurnLegacy))
+#define GIMP_OPERATION_BURN_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_BURN_LEGACY, GimpOperationBurnLegacyClass))
+#define GIMP_IS_OPERATION_BURN_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_BURN_LEGACY))
+#define GIMP_IS_OPERATION_BURN_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_BURN_LEGACY))
+#define GIMP_OPERATION_BURN_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_BURN_LEGACY, GimpOperationBurnLegacyClass))
+
+
+typedef struct _GimpOperationBurnLegacy      GimpOperationBurnLegacy;
+typedef struct _GimpOperationBurnLegacyClass GimpOperationBurnLegacyClass;
+
+struct _GimpOperationBurnLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationBurnLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_burn_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_BURN_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationdarkenonlylegacy.c b/app/operations/layer-modes-legacy/gimpoperationdarkenonlylegacy.c
new file mode 100644
index 0000000..1a3ebdf
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdarkenonlylegacy.c
@@ -0,0 +1,124 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdarkenonlymode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationdarkenonlylegacy.h"
+
+
+static gboolean   gimp_operation_darken_only_legacy_process (GeglOperation       *op,
+                                                             void                *in,
+                                                             void                *layer,
+                                                             void                *mask,
+                                                             void                *out,
+                                                             glong                samples,
+                                                             const GeglRectangle *roi,
+                                                             gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationDarkenOnlyLegacy, gimp_operation_darken_only_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_darken_only_legacy_class_init (GimpOperationDarkenOnlyLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:darken-only-legacy",
+                                 "description", "GIMP darken only mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_darken_only_legacy_process;
+}
+
+static void
+gimp_operation_darken_only_legacy_init (GimpOperationDarkenOnlyLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_darken_only_legacy_process (GeglOperation       *op,
+                                           void                *in_p,
+                                           void                *layer_p,
+                                           void                *mask_p,
+                                           void                *out_p,
+                                           glong                samples,
+                                           const GeglRectangle *roi,
+                                           gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (new_alpha && comp_alpha)
+        {
+          gint   b;
+          gfloat ratio = comp_alpha / new_alpha;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = MIN (in[b], layer[b]);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationdarkenonlylegacy.h b/app/operations/layer-modes-legacy/gimpoperationdarkenonlylegacy.h
new file mode 100644
index 0000000..c0406a1
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdarkenonlylegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdarkenonlylegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DARKEN_ONLY_LEGACY_H__
+#define __GIMP_OPERATION_DARKEN_ONLY_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_DARKEN_ONLY_LEGACY            (gimp_operation_darken_only_legacy_get_type ())
+#define GIMP_OPERATION_DARKEN_ONLY_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_DARKEN_ONLY_MODE, GimpOperationDarkenOnlyLegacy))
+#define GIMP_OPERATION_DARKEN_ONLY_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_DARKEN_ONLY_MODE, GimpOperationDarkenOnlyLegacyClass))
+#define GIMP_IS_OPERATION_DARKEN_ONLY_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_DARKEN_ONLY_MODE))
+#define GIMP_IS_OPERATION_DARKEN_ONLY_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DARKEN_ONLY_MODE))
+#define GIMP_OPERATION_DARKEN_ONLY_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DARKEN_ONLY_MODE, GimpOperationDarkenOnlyLegacyClass))
+
+
+typedef struct _GimpOperationDarkenOnlyLegacy      GimpOperationDarkenOnlyLegacy;
+typedef struct _GimpOperationDarkenOnlyLegacyClass GimpOperationDarkenOnlyLegacyClass;
+
+struct _GimpOperationDarkenOnlyLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationDarkenOnlyLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_darken_only_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_DARKEN_ONLY_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.c b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.c
new file mode 100644
index 0000000..55f3328
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.c
@@ -0,0 +1,126 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdifferencemode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationdifferencelegacy.h"
+
+
+static gboolean   gimp_operation_difference_legacy_process (GeglOperation       *op,
+                                                            void                *in,
+                                                            void                *layer,
+                                                            void                *mask,
+                                                            void                *out,
+                                                            glong                samples,
+                                                            const GeglRectangle *roi,
+                                                            gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationDifferenceLegacy, gimp_operation_difference_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_difference_legacy_class_init (GimpOperationDifferenceLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:difference-legacy",
+                                 "description", "GIMP difference mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_difference_legacy_process;
+}
+
+static void
+gimp_operation_difference_legacy_init (GimpOperationDifferenceLegacy *self)
+{
+}
+
+
+static gboolean
+gimp_operation_difference_legacy_process (GeglOperation       *op,
+                                          void                *in_p,
+                                          void                *layer_p,
+                                          void                *mask_p,
+                                          void                *out_p,
+                                          glong                samples,
+                                          const GeglRectangle *roi,
+                                          gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] - layer[b];
+              comp = (comp < 0.0f) ? -comp : comp;
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.h b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.h
new file mode 100644
index 0000000..145b9c2
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdifferencelegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdifferencelegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DIFFERENCE_LEGACY_H__
+#define __GIMP_OPERATION_DIFFERENCE_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY            (gimp_operation_difference_legacy_get_type ())
+#define GIMP_OPERATION_DIFFERENCE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY, GimpOperationDifferenceLegacy))
+#define GIMP_OPERATION_DIFFERENCE_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY, GimpOperationDifferenceLegacyClass))
+#define GIMP_IS_OPERATION_DIFFERENCE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY))
+#define GIMP_IS_OPERATION_DIFFERENCE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY))
+#define GIMP_OPERATION_DIFFERENCE_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DIFFERENCE_LEGACY, GimpOperationDifferenceLegacyClass))
+
+
+typedef struct _GimpOperationDifferenceLegacy      GimpOperationDifferenceLegacy;
+typedef struct _GimpOperationDifferenceLegacyClass GimpOperationDifferenceLegacyClass;
+
+struct _GimpOperationDifferenceLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationDifferenceLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_difference_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_DIFFERENCE_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationdividelegacy.c b/app/operations/layer-modes-legacy/gimpoperationdividelegacy.c
new file mode 100644
index 0000000..8fe8dd8
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdividelegacy.c
@@ -0,0 +1,127 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdividemode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationdividelegacy.h"
+
+
+static gboolean   gimp_operation_divide_legacy_process (GeglOperation       *op,
+                                                        void                *in,
+                                                        void                *layer,
+                                                        void                *mask,
+                                                        void                *out,
+                                                        glong                samples,
+                                                        const GeglRectangle *roi,
+                                                        gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationDivideLegacy, gimp_operation_divide_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_divide_legacy_class_init (GimpOperationDivideLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:divide-legacy",
+                                 "description", "GIMP divide mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_divide_legacy_process;
+}
+
+static void
+gimp_operation_divide_legacy_init (GimpOperationDivideLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_divide_legacy_process (GeglOperation       *op,
+                                      void                *in_p,
+                                      void                *layer_p,
+                                      void                *mask_p,
+                                      void                *out_p,
+                                      glong                samples,
+                                      const GeglRectangle *roi,
+                                      gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat ratio = comp_alpha / new_alpha;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] / layer[b];
+              comp = SAFE_CLAMP (comp, 0.0f, 1.0f);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationdividelegacy.h b/app/operations/layer-modes-legacy/gimpoperationdividelegacy.h
new file mode 100644
index 0000000..fa5de12
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdividelegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdividelegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DIVIDE_LEGACY_H__
+#define __GIMP_OPERATION_DIVIDE_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_DIVIDE_LEGACY            (gimp_operation_divide_legacy_get_type ())
+#define GIMP_OPERATION_DIVIDE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_DIVIDE_LEGACY, GimpOperationDivideLegacy))
+#define GIMP_OPERATION_DIVIDE_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_DIVIDE_LEGACY, GimpOperationDivideLegacyClass))
+#define GIMP_IS_OPERATION_DIVIDE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_DIVIDE_LEGACY))
+#define GIMP_IS_OPERATION_DIVIDE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DIVIDE_LEGACY))
+#define GIMP_OPERATION_DIVIDE_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DIVIDE_LEGACY, GimpOperationDivideLegacyClass))
+
+
+typedef struct _GimpOperationDivideLegacy      GimpOperationDivideLegacy;
+typedef struct _GimpOperationDivideLegacyClass GimpOperationDivideLegacyClass;
+
+struct _GimpOperationDivideLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationDivideLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_divide_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_DIVIDE_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationdodgelegacy.c b/app/operations/layer-modes-legacy/gimpoperationdodgelegacy.c
new file mode 100644
index 0000000..65adaef
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdodgelegacy.c
@@ -0,0 +1,127 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdodgelegacy.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationdodgelegacy.h"
+
+
+static gboolean   gimp_operation_dodge_legacy_process (GeglOperation       *op,
+                                                       void                *in,
+                                                       void                *layer,
+                                                       void                *mask,
+                                                       void                *out,
+                                                       glong                samples,
+                                                       const GeglRectangle *roi,
+                                                       gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationDodgeLegacy, gimp_operation_dodge_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_dodge_legacy_class_init (GimpOperationDodgeLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:dodge-legacy",
+                                 "description", "GIMP dodge mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_dodge_legacy_process;
+}
+
+static void
+gimp_operation_dodge_legacy_init (GimpOperationDodgeLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_dodge_legacy_process (GeglOperation       *op,
+                                     void                *in_p,
+                                     void                *layer_p,
+                                     void                *mask_p,
+                                     void                *out_p,
+                                     glong                samples,
+                                     const GeglRectangle *roi,
+                                     gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat ratio = comp_alpha / new_alpha;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] / (1.0f - layer[b]);
+              comp = SAFE_CLAMP (comp, 0.0f, 1.0f);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationdodgelegacy.h b/app/operations/layer-modes-legacy/gimpoperationdodgelegacy.h
new file mode 100644
index 0000000..b640fed
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationdodgelegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdodgelegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DODGE_LEGACY_H__
+#define __GIMP_OPERATION_DODGE_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_DODGE_LEGACY            (gimp_operation_dodge_legacy_get_type ())
+#define GIMP_OPERATION_DODGE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_DODGE_LEGACY, GimpOperationDodgeLegacy))
+#define GIMP_OPERATION_DODGE_LEGACY_CLASS(klass)  (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_DODGE_LEGACY, GimpOperationDodgeLegacyClass))
+#define GIMP_IS_OPERATION_DODGE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_DODGE_LEGACY))
+#define GIMP_IS_OPERATION_DODGE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DODGE_LEGACY))
+#define GIMP_OPERATION_DODGE_LEGACY_GET_CLASS(obj)(G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DODGE_LEGACY, GimpOperationDodgeLegacyClass))
+
+
+typedef struct _GimpOperationDodgeLegacy      GimpOperationDodgeLegacy;
+typedef struct _GimpOperationDodgeLegacyClass GimpOperationDodgeLegacyClass;
+
+struct _GimpOperationDodgeLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationDodgeLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_dodge_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_DODGE_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationgrainextractlegacy.c b/app/operations/layer-modes-legacy/gimpoperationgrainextractlegacy.c
new file mode 100644
index 0000000..77338c4
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationgrainextractlegacy.c
@@ -0,0 +1,125 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgrainextractmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationgrainextractlegacy.h"
+
+
+static gboolean   gimp_operation_grain_extract_legacy_process (GeglOperation       *op,
+                                                               void                *in,
+                                                               void                *layer,
+                                                               void                *mask,
+                                                               void                *out,
+                                                               glong                samples,
+                                                               const GeglRectangle *roi,
+                                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationGrainExtractLegacy, gimp_operation_grain_extract_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_grain_extract_legacy_class_init (GimpOperationGrainExtractLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:grain-extract-legacy",
+                                 "description", "GIMP grain extract mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_grain_extract_legacy_process;
+}
+
+static void
+gimp_operation_grain_extract_legacy_init (GimpOperationGrainExtractLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_grain_extract_legacy_process (GeglOperation       *op,
+                                             void                *in_p,
+                                             void                *layer_p,
+                                             void                *mask_p,
+                                             void                *out_p,
+                                             glong                samples,
+                                             const GeglRectangle *roi,
+                                             gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] - layer[b] + 128.0f / 255.0f;
+              comp = CLAMP (comp, 0.0f, 1.0f);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationgrainextractlegacy.h b/app/operations/layer-modes-legacy/gimpoperationgrainextractlegacy.h
new file mode 100644
index 0000000..149ee09
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationgrainextractlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgrainextractlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_GRAIN_EXTRACT_LEGACY_H__
+#define __GIMP_OPERATION_GRAIN_EXTRACT_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY            (gimp_operation_grain_extract_legacy_get_type ())
+#define GIMP_OPERATION_GRAIN_EXTRACT_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY, GimpOperationGrainExtractLegacy))
+#define GIMP_OPERATION_GRAIN_EXTRACT_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY, GimpOperationGrainExtractLegacyClass))
+#define GIMP_IS_OPERATION_GRAIN_EXTRACT_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY))
+#define GIMP_IS_OPERATION_GRAIN_EXTRACT_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY))
+#define GIMP_OPERATION_GRAIN_EXTRACT_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_GRAIN_EXTRACT_LEGACY, GimpOperationGrainExtractLegacyClass))
+
+
+typedef struct _GimpOperationGrainExtractLegacy      GimpOperationGrainExtractLegacy;
+typedef struct _GimpOperationGrainExtractLegacyClass GimpOperationGrainExtractLegacyClass;
+
+struct _GimpOperationGrainExtractLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationGrainExtractLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_grain_extract_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_GRAIN_EXTRACT_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationgrainmergelegacy.c b/app/operations/layer-modes-legacy/gimpoperationgrainmergelegacy.c
new file mode 100644
index 0000000..c12a995
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationgrainmergelegacy.c
@@ -0,0 +1,125 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgrainmergemode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationgrainmergelegacy.h"
+
+
+static gboolean   gimp_operation_grain_merge_legacy_process (GeglOperation       *op,
+                                                             void                *in,
+                                                             void                *layer,
+                                                             void                *mask,
+                                                             void                *out,
+                                                             glong                samples,
+                                                             const GeglRectangle *roi,
+                                                             gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationGrainMergeLegacy, gimp_operation_grain_merge_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_grain_merge_legacy_class_init (GimpOperationGrainMergeLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:grain-merge-legacy",
+                                 "description", "GIMP grain merge mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_grain_merge_legacy_process;
+}
+
+static void
+gimp_operation_grain_merge_legacy_init (GimpOperationGrainMergeLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_grain_merge_legacy_process (GeglOperation       *op,
+                                           void                *in_p,
+                                           void                *layer_p,
+                                           void                *mask_p,
+                                           void                *out_p,
+                                           glong                samples,
+                                           const GeglRectangle *roi,
+                                           gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] + layer[b] - 128.0f / 255.0f;
+              comp = CLAMP (comp, 0.0f, 1.0f);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask ++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationgrainmergelegacy.h b/app/operations/layer-modes-legacy/gimpoperationgrainmergelegacy.h
new file mode 100644
index 0000000..344e895
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationgrainmergelegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationgrainmergelegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_GRAIN_MERGE_LEGACY_H__
+#define __GIMP_OPERATION_GRAIN_MERGE_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY            (gimp_operation_grain_merge_legacy_get_type ())
+#define GIMP_OPERATION_GRAIN_MERGE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY, GimpOperationGrainMergeLegacy))
+#define GIMP_OPERATION_GRAIN_MERGE_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY, GimpOperationGrainMergeLegacyClass))
+#define GIMP_IS_OPERATION_GRAIN_MERGE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY))
+#define GIMP_IS_OPERATION_GRAIN_MERGE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY))
+#define GIMP_OPERATION_GRAIN_MERGE_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_GRAIN_MERGE_LEGACY, GimpOperationGrainMergeLegacyClass))
+
+
+typedef struct _GimpOperationGrainMergeLegacy      GimpOperationGrainMergeLegacy;
+typedef struct _GimpOperationGrainMergeLegacyClass GimpOperationGrainMergeLegacyClass;
+
+struct _GimpOperationGrainMergeLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationGrainMergeLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_grain_merge_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_GRAIN_MERGE_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationhardlightlegacy.c b/app/operations/layer-modes-legacy/gimpoperationhardlightlegacy.c
new file mode 100644
index 0000000..68f8eda
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhardlightlegacy.c
@@ -0,0 +1,135 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhardlightmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationhardlightlegacy.h"
+
+
+static gboolean   gimp_operation_hardlight_legacy_process (GeglOperation       *op,
+                                                           void                *in,
+                                                           void                *layer,
+                                                           void                *mask,
+                                                           void                *out,
+                                                           glong                samples,
+                                                           const GeglRectangle *roi,
+                                                           gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHardlightLegacy, gimp_operation_hardlight_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_hardlight_legacy_class_init (GimpOperationHardlightLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:hardlight-legacy",
+                                 "description", "GIMP hardlight mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_hardlight_legacy_process;
+}
+
+static void
+gimp_operation_hardlight_legacy_init (GimpOperationHardlightLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_hardlight_legacy_process (GeglOperation       *op,
+                                         void                *in_p,
+                                         void                *layer_p,
+                                         void                *mask_p,
+                                         void                *out_p,
+                                         glong                samples,
+                                         const GeglRectangle *roi,
+                                         gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp;
+
+              if (layer[b] > 128.0f / 255.0f)
+                {
+                  comp = (1.0 - in[b]) * (1.0 - (layer[b] - 128.0f / 255.0f) * 2.0f);
+                  comp = MIN (1.0f - comp, 1.0f);
+                }
+              else
+                {
+                  comp = in[b] * (layer[b] * 2.0f);
+                  comp = MIN (comp, 1.0f);
+                }
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask ++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationhardlightlegacy.h b/app/operations/layer-modes-legacy/gimpoperationhardlightlegacy.h
new file mode 100644
index 0000000..38791be
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhardlightlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhardlightlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HARDLIGHT_LEGACY_H__
+#define __GIMP_OPERATION_HARDLIGHT_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY            (gimp_operation_hardlight_legacy_get_type ())
+#define GIMP_OPERATION_HARDLIGHT_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY, GimpOperationHardlightLegacy))
+#define GIMP_OPERATION_HARDLIGHT_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY, GimpOperationHardlightLegacyClass))
+#define GIMP_IS_OPERATION_HARDLIGHT_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY))
+#define GIMP_IS_OPERATION_HARDLIGHT_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY))
+#define GIMP_OPERATION_HARDLIGHT_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HARDLIGHT_LEGACY, GimpOperationHardlightLegacyClass))
+
+
+typedef struct _GimpOperationHardlightLegacy      GimpOperationHardlightLegacy;
+typedef struct _GimpOperationHardlightLegacyClass GimpOperationHardlightLegacyClass;
+
+struct _GimpOperationHardlightLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationHardlightLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_hardlight_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_HARDLIGHT_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationhslcolorlegacy.c b/app/operations/layer-modes-legacy/gimpoperationhslcolorlegacy.c
new file mode 100644
index 0000000..6fd7a95
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhslcolorlegacy.c
@@ -0,0 +1,141 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationcolormode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationhslcolorlegacy.h"
+
+
+static gboolean   gimp_operation_hsl_color_legacy_process (GeglOperation       *op,
+                                                           void                *in,
+                                                           void                *layer,
+                                                           void                *mask,
+                                                           void                *out,
+                                                           glong                samples,
+                                                           const GeglRectangle *roi,
+                                                           gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHslColorLegacy, gimp_operation_hsl_color_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_hsl_color_legacy_class_init (GimpOperationHslColorLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:hsl-color-legacy",
+                                 "description", "GIMP color mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_hsl_color_legacy_process;
+}
+
+static void
+gimp_operation_hsl_color_legacy_init (GimpOperationHslColorLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_hsl_color_legacy_process (GeglOperation       *op,
+                                         void                *in_p,
+                                         void                *layer_p,
+                                         void                *mask_p,
+                                         void                *out_p,
+                                         glong                samples,
+                                         const GeglRectangle *roi,
+                                         gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      GimpHSL layer_hsl, out_hsl;
+      GimpRGB layer_rgb = {layer[0], layer[1], layer[2]};
+      GimpRGB out_rgb   = {in[0], in[1], in[2]};
+      gfloat  comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat out_tmp[3];
+          gfloat ratio = comp_alpha / new_alpha;
+
+          gimp_rgb_to_hsl (&layer_rgb, &layer_hsl);
+          gimp_rgb_to_hsl (&out_rgb, &out_hsl);
+
+          out_hsl.h = layer_hsl.h;
+          out_hsl.s = layer_hsl.s;
+          gimp_hsl_to_rgb (&out_hsl, &out_rgb);
+
+          out_tmp[0] = out_rgb.r;
+          out_tmp[1] = out_rgb.g;
+          out_tmp[2] = out_rgb.b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = out_tmp[b] * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationhslcolorlegacy.h b/app/operations/layer-modes-legacy/gimpoperationhslcolorlegacy.h
new file mode 100644
index 0000000..add2933
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhslcolorlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhslcolorlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HSL_COLOR_LEGACY_H__
+#define __GIMP_OPERATION_HSL_COLOR_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY            (gimp_operation_hsl_color_legacy_get_type ())
+#define GIMP_OPERATION_HSL_COLOR_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY, GimpOperationHslColorLegacy))
+#define GIMP_OPERATION_HSL_COLOR_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY, GimpOperationHslColorLegacyClass))
+#define GIMP_IS_OPERATION_HSL_COLOR_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY))
+#define GIMP_IS_OPERATION_HSL_COLOR_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY))
+#define GIMP_OPERATION_HSL_COLOR_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HSL_COLOR_LEGACY, GimpOperationHslColorLegacyClass))
+
+
+typedef struct _GimpOperationHslColorLegacy      GimpOperationHslColorLegacy;
+typedef struct _GimpOperationHslColorLegacyClass GimpOperationHslColorLegacyClass;
+
+struct _GimpOperationHslColorLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationHslColorLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_hsl_color_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_HSL_COLOR_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationhsvhuelegacy.c b/app/operations/layer-modes-legacy/gimpoperationhsvhuelegacy.c
new file mode 100644
index 0000000..eb9c040
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhsvhuelegacy.c
@@ -0,0 +1,146 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhuemode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl-plugin.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationhsvhuelegacy.h"
+
+
+static gboolean   gimp_operation_hsv_hue_legacy_process (GeglOperation       *op,
+                                                         void                *in,
+                                                         void                *layer,
+                                                         void                *mask,
+                                                         void                *out,
+                                                         glong                samples,
+                                                         const GeglRectangle *roi,
+                                                         gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHsvHueLegacy, gimp_operation_hsv_hue_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_hsv_hue_legacy_class_init (GimpOperationHsvHueLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:hsv-hue-legacy",
+                                 "description", "GIMP hue mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_hsv_hue_legacy_process;
+}
+
+static void
+gimp_operation_hsv_hue_legacy_init (GimpOperationHsvHueLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_hsv_hue_legacy_process (GeglOperation       *op,
+                                       void                *in_p,
+                                       void                *layer_p,
+                                       void                *mask_p,
+                                       void                *out_p,
+                                       glong                samples,
+                                       const GeglRectangle *roi,
+                                       gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      GimpHSV layer_hsv, out_hsv;
+      GimpRGB layer_rgb = {layer[0], layer[1], layer[2]};
+      GimpRGB out_rgb   = {in[0], in[1], in[2]};
+      gfloat  comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat out_tmp[3];
+          gfloat ratio = comp_alpha / new_alpha;
+
+          gimp_rgb_to_hsv (&layer_rgb, &layer_hsv);
+          gimp_rgb_to_hsv (&out_rgb, &out_hsv);
+
+          /*  Composition should have no effect if saturation is zero.
+           *  otherwise, black would be painted red (see bug #123296).
+           */
+          if (layer_hsv.s)
+            {
+              out_hsv.h = layer_hsv.h;
+            }
+          gimp_hsv_to_rgb (&out_hsv, &out_rgb);
+
+          out_tmp[0] = out_rgb.r;
+          out_tmp[1] = out_rgb.g;
+          out_tmp[2] = out_rgb.b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = out_tmp[b] * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationhsvhuelegacy.h b/app/operations/layer-modes-legacy/gimpoperationhsvhuelegacy.h
new file mode 100644
index 0000000..59ef125
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhsvhuelegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhsvhuelegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HSV_HUE_LEGACY_H__
+#define __GIMP_OPERATION_HSV_HUE_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_HSV_HUE_LEGACY            (gimp_operation_hsv_hue_legacy_get_type ())
+#define GIMP_OPERATION_HSV_HUE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HSV_HUE_LEGACY, GimpOperationHsvHueLegacy))
+#define GIMP_OPERATION_HSV_HUE_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HSV_HUE_LEGACY, GimpOperationHsvHueLegacyClass))
+#define GIMP_IS_OPERATION_HSV_HUE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HSV_HUE_LEGACY))
+#define GIMP_IS_OPERATION_HSV_HUE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HSV_HUE_LEGACY))
+#define GIMP_OPERATION_HSV_HUE_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HSV_HUE_LEGACY, GimpOperationHsvHueLegacyClass))
+
+
+typedef struct _GimpOperationHsvHueLegacy      GimpOperationHsvHueLegacy;
+typedef struct _GimpOperationHsvHueLegacyClass GimpOperationHsvHueLegacyClass;
+
+struct _GimpOperationHsvHueLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationHsvHueLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_hsv_hue_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_HSV_HUE_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationhsvsaturationlegacy.c b/app/operations/layer-modes-legacy/gimpoperationhsvsaturationlegacy.c
new file mode 100644
index 0000000..d150aa1
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhsvsaturationlegacy.c
@@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsaturationmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationhsvsaturationlegacy.h"
+
+
+static gboolean   gimp_operation_hsv_saturation_legacy_process (GeglOperation       *op,
+                                                                void                *in,
+                                                                void                *layer,
+                                                                void                *mask,
+                                                                void                *out,
+                                                                glong                samples,
+                                                                const GeglRectangle *roi,
+                                                                gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHsvSaturationLegacy, gimp_operation_hsv_saturation_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_hsv_saturation_legacy_class_init (GimpOperationHsvSaturationLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:hsv-saturation-legacy",
+                                 "description", "GIMP saturation mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_hsv_saturation_legacy_process;
+}
+
+static void
+gimp_operation_hsv_saturation_legacy_init (GimpOperationHsvSaturationLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_hsv_saturation_legacy_process (GeglOperation       *op,
+                                              void                *in_p,
+                                              void                *layer_p,
+                                              void                *mask_p,
+                                              void                *out_p,
+                                              glong                samples,
+                                              const GeglRectangle *roi,
+                                              gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      GimpHSV layer_hsv, out_hsv;
+      GimpRGB layer_rgb = {layer[0], layer[1], layer[2]};
+      GimpRGB out_rgb   = {in[0], in[1], in[2]};
+      gfloat  comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat out_tmp[3];
+          gfloat ratio = comp_alpha / new_alpha;
+
+          gimp_rgb_to_hsv (&layer_rgb, &layer_hsv);
+          gimp_rgb_to_hsv (&out_rgb, &out_hsv);
+
+          out_hsv.s = layer_hsv.s;
+          gimp_hsv_to_rgb (&out_hsv, &out_rgb);
+
+          out_tmp[0] = out_rgb.r;
+          out_tmp[1] = out_rgb.g;
+          out_tmp[2] = out_rgb.b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = out_tmp[b] * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationhsvsaturationlegacy.h b/app/operations/layer-modes-legacy/gimpoperationhsvsaturationlegacy.h
new file mode 100644
index 0000000..ecb5589
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhsvsaturationlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhsvsaturationlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HSV_SATURATION_LEGACY_H__
+#define __GIMP_OPERATION_HSV_SATURATION_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY            (gimp_operation_hsv_saturation_legacy_get_type ())
+#define GIMP_OPERATION_HSV_SATURATION_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY, GimpOperationHsvSaturationLegacy))
+#define GIMP_OPERATION_HSV_SATURATION_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY, GimpOperationHsvSaturationLegacyClass))
+#define GIMP_IS_OPERATION_HSV_SATURATION_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY))
+#define GIMP_IS_OPERATION_HSV_SATURATION_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY))
+#define GIMP_OPERATION_HSV_SATURATION_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HSV_SATURATION_LEGACY, GimpOperationHsvSaturationLegacyClass))
+
+
+typedef struct _GimpOperationHsvSaturationLegacy      GimpOperationHsvSaturationLegacy;
+typedef struct _GimpOperationHsvSaturationLegacyClass GimpOperationHsvSaturationLegacyClass;
+
+struct _GimpOperationHsvSaturationLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationHsvSaturationLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_hsv_saturation_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_HSV_SATURATION_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationhsvvaluelegacy.c b/app/operations/layer-modes-legacy/gimpoperationhsvvaluelegacy.c
new file mode 100644
index 0000000..b873325
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhsvvaluelegacy.c
@@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationvaluemode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationhsvvaluelegacy.h"
+
+
+static gboolean   gimp_operation_hsv_value_legacy_process (GeglOperation       *op,
+                                                           void                *in,
+                                                           void                *layer,
+                                                           void                *mask,
+                                                           void                *out,
+                                                           glong                samples,
+                                                           const GeglRectangle *roi,
+                                                           gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationHsvValueLegacy, gimp_operation_hsv_value_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_hsv_value_legacy_class_init (GimpOperationHsvValueLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:hsv-value-legacy",
+                                 "description", "GIMP value mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_hsv_value_legacy_process;
+}
+
+static void
+gimp_operation_hsv_value_legacy_init (GimpOperationHsvValueLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_hsv_value_legacy_process (GeglOperation       *op,
+                                         void                *in_p,
+                                         void                *layer_p,
+                                         void                *mask_p,
+                                         void                *out_p,
+                                         glong                samples,
+                                         const GeglRectangle *roi,
+                                         gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      GimpHSV layer_hsv, out_hsv;
+      GimpRGB layer_rgb = {layer[0], layer[1], layer[2]};
+      GimpRGB out_rgb   = {in[0], in[1], in[2]};
+      gfloat  comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat out_tmp[3];
+          gfloat ratio = comp_alpha / new_alpha;
+
+          gimp_rgb_to_hsv (&layer_rgb, &layer_hsv);
+          gimp_rgb_to_hsv (&out_rgb, &out_hsv);
+
+          out_hsv.v = layer_hsv.v;
+          gimp_hsv_to_rgb (&out_hsv, &out_rgb);
+
+          out_tmp[0] = out_rgb.r;
+          out_tmp[1] = out_rgb.g;
+          out_tmp[2] = out_rgb.b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = out_tmp[b] * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationhsvvaluelegacy.h b/app/operations/layer-modes-legacy/gimpoperationhsvvaluelegacy.h
new file mode 100644
index 0000000..7701ffd
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationhsvvaluelegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationhsvvaluelegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_HSV_VALUE_LEGACY_H__
+#define __GIMP_OPERATION_HSV_VALUE_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY            (gimp_operation_hsv_value_legacy_get_type ())
+#define GIMP_OPERATION_HSV_VALUE_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY, GimpOperationHsvValueLegacy))
+#define GIMP_OPERATION_HSV_VALUE_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY, GimpOperationHsvValueLegacyClass))
+#define GIMP_IS_OPERATION_HSV_VALUE_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY))
+#define GIMP_IS_OPERATION_HSV_VALUE_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY))
+#define GIMP_OPERATION_HSV_VALUE_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_HSV_VALUE_LEGACY, GimpOperationHsvValueLegacyClass))
+
+
+typedef struct _GimpOperationHsvValueLegacy      GimpOperationHsvValueLegacy;
+typedef struct _GimpOperationHsvValueLegacyClass GimpOperationHsvValueLegacyClass;
+
+struct _GimpOperationHsvValueLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationHsvValueLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_hsv_value_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_HSV_VALUE_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationlightenonlylegacy.c b/app/operations/layer-modes-legacy/gimpoperationlightenonlylegacy.c
new file mode 100644
index 0000000..0e54a0c
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationlightenonlylegacy.c
@@ -0,0 +1,124 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlightenonlylegacy.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationlightenonlylegacy.h"
+
+
+static gboolean   gimp_operation_lighten_only_legacy_process (GeglOperation       *op,
+                                                              void                *in,
+                                                              void                *layer,
+                                                              void                *mask,
+                                                              void                *out,
+                                                              glong                samples,
+                                                              const GeglRectangle *roi,
+                                                              gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationLightenOnlyLegacy, gimp_operation_lighten_only_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_lighten_only_legacy_class_init (GimpOperationLightenOnlyLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:lighten-only-legacy",
+                                 "description", "GIMP lighten only legacy operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_lighten_only_legacy_process;
+}
+
+static void
+gimp_operation_lighten_only_legacy_init (GimpOperationLightenOnlyLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_lighten_only_legacy_process (GeglOperation       *op,
+                                            void                *in_p,
+                                            void                *layer_p,
+                                            void                *mask_p,
+                                            void                *out_p,
+                                            glong                samples,
+                                            const GeglRectangle *roi,
+                                            gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat ratio = comp_alpha / new_alpha;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = MAX (layer[b], in[b]);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationlightenonlylegacy.h b/app/operations/layer-modes-legacy/gimpoperationlightenonlylegacy.h
new file mode 100644
index 0000000..2417d57
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationlightenonlylegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlightenonlylegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_LIGHTEN_ONLY_LEGACY_H__
+#define __GIMP_OPERATION_LIGHTEN_ONLY_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY            (gimp_operation_lighten_only_legacy_get_type ())
+#define GIMP_OPERATION_LIGHTEN_ONLY_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY, GimpOperationLightenOnlyLegacy))
+#define GIMP_OPERATION_LIGHTEN_ONLY_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY, GimpOperationLightenOnlyLegacyClass))
+#define GIMP_IS_OPERATION_LIGHTEN_ONLY_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY))
+#define GIMP_IS_OPERATION_LIGHTEN_ONLY_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY))
+#define GIMP_OPERATION_LIGHTEN_ONLY_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_LIGHTEN_ONLY_LEGACY, GimpOperationLightenOnlyLegacyClass))
+
+
+typedef struct _GimpOperationLightenOnlyLegacy      GimpOperationLightenOnlyLegacy;
+typedef struct _GimpOperationLightenOnlyLegacyClass GimpOperationLightenOnlyLegacyClass;
+
+struct _GimpOperationLightenOnlyLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationLightenOnlyLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_lighten_only_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_LIGHTEN_ONLY_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationmultiplylegacy.c b/app/operations/layer-modes-legacy/gimpoperationmultiplylegacy.c
new file mode 100644
index 0000000..69c63c4
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationmultiplylegacy.c
@@ -0,0 +1,124 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationmultiplylegacy.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "operations/operations-types.h"
+
+#include "gimpoperationmultiplylegacy.h"
+
+
+static gboolean   gimp_operation_multiply_legacy_process (GeglOperation       *op,
+                                                          void                *in,
+                                                          void                *layer,
+                                                          void                *mask,
+                                                          void                *out,
+                                                          glong                samples,
+                                                          const GeglRectangle *roi,
+                                                          gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationMultiplyLegacy, gimp_operation_multiply_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_multiply_legacy_class_init (GimpOperationMultiplyLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:multiply-legacy",
+                                 "description", "GIMP multiply legacy operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_multiply_legacy_process;
+}
+
+static void
+gimp_operation_multiply_legacy_init (GimpOperationMultiplyLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_multiply_legacy_process (GeglOperation       *op,
+                                        void                *in_p,
+                                        void                *layer_p,
+                                        void                *mask_p,
+                                        void                *out_p,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = layer[b] * in[b];
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationmultiplylegacy.h b/app/operations/layer-modes-legacy/gimpoperationmultiplylegacy.h
new file mode 100644
index 0000000..f099ebd
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationmultiplylegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationmultiplylegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_MULTIPLY_LEGACY_H__
+#define __GIMP_OPERATION_MULTIPLY_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_MULTIPLY_LEGACY            (gimp_operation_multiply_legacy_get_type ())
+#define GIMP_OPERATION_MULTIPLY_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_MULTIPLY_LEGACY, GimpOperationMultiplyLegacy))
+#define GIMP_OPERATION_MULTIPLY_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_MULTIPLY_LEGACY, GimpOperationMultiplyLegacyClass))
+#define GIMP_IS_OPERATION_MULTIPLY_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_MULTIPLY_LEGACY))
+#define GIMP_IS_OPERATION_MULTIPLY_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_MULTIPLY_LEGACY))
+#define GIMP_OPERATION_MULTIPLY_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_MULTIPLY_LEGACY, GimpOperationMultiplyLegacyClass))
+
+
+typedef struct _GimpOperationMultiplyLegacy      GimpOperationMultiplyLegacy;
+typedef struct _GimpOperationMultiplyLegacyClass GimpOperationMultiplyLegacyClass;
+
+struct _GimpOperationMultiplyLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationMultiplyLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_multiply_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_MULTIPLY_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationscreenlegacy.c b/app/operations/layer-modes-legacy/gimpoperationscreenlegacy.c
new file mode 100644
index 0000000..f2ff2fc
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationscreenlegacy.c
@@ -0,0 +1,124 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationscreenlegacy.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationscreenlegacy.h"
+
+
+static gboolean   gimp_operation_screen_legacy_process (GeglOperation       *op,
+                                                        void                *in,
+                                                        void                *layer,
+                                                        void                *mask,
+                                                        void                *out,
+                                                        glong                samples,
+                                                        const GeglRectangle *roi,
+                                                        gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationScreenLegacy, gimp_operation_screen_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_screen_legacy_class_init (GimpOperationScreenLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:screen-legacy",
+                                 "description", "GIMP screen mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_screen_legacy_process;
+}
+
+static void
+gimp_operation_screen_legacy_init (GimpOperationScreenLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_screen_legacy_process (GeglOperation       *op,
+                                      void                *in_p,
+                                      void                *layer_p,
+                                      void                *mask_p,
+                                      void                *out_p,
+                                      glong                samples,
+                                      const GeglRectangle *roi,
+                                      gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = 1.0f - (1.0f - in[b]) * (1.0f - layer[b]);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationscreenlegacy.h b/app/operations/layer-modes-legacy/gimpoperationscreenlegacy.h
new file mode 100644
index 0000000..5d0dc9e
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationscreenlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationscreenlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SCREEN_LEGACY_H__
+#define __GIMP_OPERATION_SCREEN_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_SCREEN_LEGACY            (gimp_operation_screen_legacy_get_type ())
+#define GIMP_OPERATION_SCREEN_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SCREEN_LEGACY, GimpOperationScreenLegacy))
+#define GIMP_OPERATION_SCREEN_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SCREEN_LEGACY, GimpOperationScreenLegacyClass))
+#define GIMP_IS_OPERATION_SCREEN_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SCREEN_LEGACY))
+#define GIMP_IS_OPERATION_SCREEN_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SCREEN_LEGACY))
+#define GIMP_OPERATION_SCREEN_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SCREEN_LEGACY, GimpOperationScreenLegacyClass))
+
+
+typedef struct _GimpOperationScreenLegacy      GimpOperationScreenLegacy;
+typedef struct _GimpOperationScreenLegacyClass GimpOperationScreenLegacyClass;
+
+struct _GimpOperationScreenLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationScreenLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_screen_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SCREEN_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationsoftlightlegacy.c b/app/operations/layer-modes-legacy/gimpoperationsoftlightlegacy.c
new file mode 100644
index 0000000..1736e00
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationsoftlightlegacy.c
@@ -0,0 +1,157 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsoftlightmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationsoftlightlegacy.h"
+
+
+static gboolean   gimp_operation_softlight_legacy_process (GeglOperation       *op,
+                                                           void                *in,
+                                                           void                *layer,
+                                                           void                *mask,
+                                                           void                *out,
+                                                           glong                samples,
+                                                           const GeglRectangle *roi,
+                                                           gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationSoftlightLegacy, gimp_operation_softlight_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static const gchar* reference_xml = "<?xml version='1.0' encoding='UTF-8'?>"
+"<gegl>"
+"<node operation='gimp:softlight-legacy'>"
+"  <node operation='gegl:load'>"
+"    <params>"
+"      <param name='path'>B.png</param>"
+"    </params>"
+"  </node>"
+"</node>"
+"<node operation='gegl:load'>"
+"  <params>"
+"    <param name='path'>A.png</param>"
+"  </params>"
+"</node>"
+"</gegl>";
+
+
+static void
+gimp_operation_softlight_legacy_class_init (GimpOperationSoftlightLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:softlight-legacy",
+                                 "description", "GIMP softlight mode operation",
+                                 "reference-image", "soft-light-mode.png",
+                                 "reference-composition", reference_xml,
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_softlight_legacy_process;
+}
+
+static void
+gimp_operation_softlight_legacy_init (GimpOperationSoftlightLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_softlight_legacy_process (GeglOperation       *op,
+                                         void                *in_p,
+                                         void                *layer_p,
+                                         void                *mask_p,
+                                         void                *out_p,
+                                         glong                samples,
+                                         const GeglRectangle *roi,
+                                         gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+#if 0
+              /* softlight is now used for what GIMP formerly called
+               * OVERLAY.  We fixed OVERLAY to use the right math
+               * (under the name NEW_OVERLAY), and redirect uses of
+               * the old OVERLAY blend mode here. This math was
+               * formerly used for OVERLAY and is exactly the same as
+               * the multiply, screen, comp math used below.
+               * See bug #673501.
+               */
+              gfloat comp = in[b] * (in[b] + (2.0f * layer[b]) * (1.0f - in[b]));
+#endif
+
+              gfloat multiply = in[b] * layer[b];
+              gfloat screen   = 1.0f - (1.0f - in[b]) * (1.0f - layer[b]);
+              gfloat comp     = (1.0f - in[b]) * multiply + in[b] * screen;
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask ++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationsoftlightlegacy.h b/app/operations/layer-modes-legacy/gimpoperationsoftlightlegacy.h
new file mode 100644
index 0000000..aa8930e
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationsoftlightlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsoftlightlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SOFTLIGHT_LEGACY_H__
+#define __GIMP_OPERATION_SOFTLIGHT_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY            (gimp_operation_softlight_legacy_get_type ())
+#define GIMP_OPERATION_SOFTLIGHT_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY, GimpOperationSoftlightLegacy))
+#define GIMP_OPERATION_SOFTLIGHT_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY, GimpOperationSoftlightLegacyClass))
+#define GIMP_IS_OPERATION_SOFTLIGHT_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY))
+#define GIMP_IS_OPERATION_SOFTLIGHT_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY))
+#define GIMP_OPERATION_SOFTLIGHT_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SOFTLIGHT_LEGACY, GimpOperationSoftlightLegacyClass))
+
+
+typedef struct _GimpOperationSoftlightLegacy      GimpOperationSoftlightLegacy;
+typedef struct _GimpOperationSoftlightLegacyClass GimpOperationSoftlightLegacyClass;
+
+struct _GimpOperationSoftlightLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationSoftlightLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_softlight_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SOFTLIGHT_LEGACY_H__ */
diff --git a/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c
new file mode 100644
index 0000000..0bf3b5e
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.c
@@ -0,0 +1,125 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsubtractmode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationsubtractlegacy.h"
+
+
+static gboolean   gimp_operation_subtract_legacy_process (GeglOperation       *op,
+                                                          void                *in,
+                                                          void                *layer,
+                                                          void                *mask,
+                                                          void                *out,
+                                                          glong                samples,
+                                                          const GeglRectangle *roi,
+                                                          gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationSubtractLegacy, gimp_operation_subtract_legacy,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_subtract_legacy_class_init (GimpOperationSubtractLegacyClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:subtract-legacy",
+                                 "description", "GIMP subtract mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_subtract_legacy_process;
+}
+
+static void
+gimp_operation_subtract_legacy_init (GimpOperationSubtractLegacy *self)
+{
+}
+
+static gboolean
+gimp_operation_subtract_legacy_process (GeglOperation       *op,
+                                        void                *in_p,
+                                        void                *layer_p,
+                                        void                *mask_p,
+                                        void                *out_p,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+
+  while (samples--)
+    {
+      gfloat comp_alpha, new_alpha;
+
+      comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
+      if (mask)
+        comp_alpha *= *mask;
+
+      new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
+
+      if (comp_alpha && new_alpha)
+        {
+          gint   b;
+          gfloat ratio = comp_alpha / new_alpha;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              gfloat comp = in[b] - layer[b];
+              comp = CLAMP (comp, 0.0f, 1.0f);
+
+              out[b] = comp * ratio + in[b] * (1.0f - ratio);
+            }
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in    += 4;
+      layer += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.h b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.h
new file mode 100644
index 0000000..34a55d5
--- /dev/null
+++ b/app/operations/layer-modes-legacy/gimpoperationsubtractlegacy.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsubtractlegacy.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SUBTRACT_LEGACY_H__
+#define __GIMP_OPERATION_SUBTRACT_LEGACY_H__
+
+
+#include "operations/layer-modes/gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_SUBTRACT_LEGACY            (gimp_operation_subtract_legacy_get_type ())
+#define GIMP_OPERATION_SUBTRACT_LEGACY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SUBTRACT_LEGACY, GimpOperationSubtractLegacy))
+#define GIMP_OPERATION_SUBTRACT_LEGACY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SUBTRACT_LEGACY, GimpOperationSubtractLegacyClass))
+#define GIMP_IS_OPERATION_SUBTRACT_LEGACY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SUBTRACT_LEGACY))
+#define GIMP_IS_OPERATION_SUBTRACT_LEGACY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SUBTRACT_LEGACY))
+#define GIMP_OPERATION_SUBTRACT_LEGACY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SUBTRACT_LEGACY, GimpOperationSubtractLegacyClass))
+
+
+typedef struct _GimpOperationSubtractLegacy      GimpOperationSubtractLegacy;
+typedef struct _GimpOperationSubtractLegacyClass GimpOperationSubtractLegacyClass;
+
+struct _GimpOperationSubtractLegacy
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationSubtractLegacyClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_subtract_legacy_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SUBTRACT_LEGACY_H__ */
diff --git a/app/operations/layer-modes/Makefile.am b/app/operations/layer-modes/Makefile.am
new file mode 100644
index 0000000..24af8fe
--- /dev/null
+++ b/app/operations/layer-modes/Makefile.am
@@ -0,0 +1,79 @@
+## Process this file with automake to produce Makefile.in
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-Layer-Modes\"	\
+	-I$(top_builddir)			\
+	-I$(top_srcdir)				\
+	-I$(top_builddir)/app			\
+	-I$(top_srcdir)/app			\
+	$(CAIRO_CFLAGS)				\
+	$(GEGL_CFLAGS)				\
+	$(GDK_PIXBUF_CFLAGS)			\
+	-I$(includedir)
+
+noinst_LIBRARIES = \
+	libapplayermodes-generic.a	\
+	libapplayermodes-sse2.a		\
+	libapplayermodes-sse4.a		\
+	libapplayermodes.a
+
+libapplayermodes_generic_a_sources = \
+	gimp-layer-modes.c			\
+	gimp-layer-modes.h			\
+	\
+	gimpoperationlayermode.c		\
+	gimpoperationlayermode.h		\
+	gimpoperationlayermode-blend.c		\
+	gimpoperationlayermode-blend.h		\
+	gimpoperationlayermode-composite.c	\
+	gimpoperationlayermode-composite.h	\
+	\
+	gimpoperationantierase.c		\
+	gimpoperationantierase.h		\
+	gimpoperationbehind.c			\
+	gimpoperationbehind.h			\
+	gimpoperationdissolve.c			\
+	gimpoperationdissolve.h			\
+	gimpoperationerase.c			\
+	gimpoperationerase.h			\
+	gimpoperationmerge.c			\
+	gimpoperationmerge.h			\
+	gimpoperationnormal.c			\
+	gimpoperationnormal.h			\
+	gimpoperationpassthrough.c		\
+	gimpoperationpassthrough.h		\
+	gimpoperationreplace.c			\
+	gimpoperationreplace.h			\
+	gimpoperationsplit.c			\
+	gimpoperationsplit.h
+
+libapplayermodes_sse2_a_sources = \
+	gimpoperationlayermode-composite-sse2.c	\
+	\
+	gimpoperationnormal-sse2.c
+
+libapplayermodes_sse4_a_sources = \
+	gimpoperationnormal-sse4.c
+
+
+libapplayermodes_generic_a_SOURCES = $(libapplayermodes_generic_a_sources)
+
+libapplayermodes_sse2_a_SOURCES = $(libapplayermodes_sse2_a_sources)
+
+libapplayermodes_sse2_a_CFLAGS = $(SSE2_EXTRA_CFLAGS)
+
+libapplayermodes_sse4_a_SOURCES = $(libapplayermodes_sse4_a_sources)
+
+libapplayermodes_sse4_a_CFLAGS = $(SSE4_1_EXTRA_CFLAGS)
+
+libapplayermodes_a_SOURCES =
+
+
+libapplayermodes.a: libapplayermodes-generic.a \
+                    libapplayermodes-sse2.a \
+                    libapplayermodes-sse4.a
+	$(AR) $(ARFLAGS) libapplayermodes.a \
+	  $(libapplayermodes_generic_a_OBJECTS) \
+	  $(libapplayermodes_sse2_a_OBJECTS) \
+	  $(libapplayermodes_sse4_a_OBJECTS)
+	$(RANLIB) libapplayermodes.a
diff --git a/app/operations/layer-modes/Makefile.in b/app/operations/layer-modes/Makefile.in
new file mode 100644
index 0000000..d91f3a9
--- /dev/null
+++ b/app/operations/layer-modes/Makefile.in
@@ -0,0 +1,1114 @@
+# Makefile.in generated by automake 1.16.2 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
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+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
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+         exit 1;; \
+  esac; \
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+  if $(am__is_gnu_make); then \
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+	gimpoperationlayermode.$(OBJEXT) \
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+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"Gimp-Layer-Modes\"	\
+	-I$(top_builddir)			\
+	-I$(top_srcdir)				\
+	-I$(top_builddir)/app			\
+	-I$(top_srcdir)/app			\
+	$(CAIRO_CFLAGS)				\
+	$(GEGL_CFLAGS)				\
+	$(GDK_PIXBUF_CFLAGS)			\
+	-I$(includedir)
+
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+	libapplayermodes-generic.a	\
+	libapplayermodes-sse2.a		\
+	libapplayermodes-sse4.a		\
+	libapplayermodes.a
+
+libapplayermodes_generic_a_sources = \
+	gimp-layer-modes.c			\
+	gimp-layer-modes.h			\
+	\
+	gimpoperationlayermode.c		\
+	gimpoperationlayermode.h		\
+	gimpoperationlayermode-blend.c		\
+	gimpoperationlayermode-blend.h		\
+	gimpoperationlayermode-composite.c	\
+	gimpoperationlayermode-composite.h	\
+	\
+	gimpoperationantierase.c		\
+	gimpoperationantierase.h		\
+	gimpoperationbehind.c			\
+	gimpoperationbehind.h			\
+	gimpoperationdissolve.c			\
+	gimpoperationdissolve.h			\
+	gimpoperationerase.c			\
+	gimpoperationerase.h			\
+	gimpoperationmerge.c			\
+	gimpoperationmerge.h			\
+	gimpoperationnormal.c			\
+	gimpoperationnormal.h			\
+	gimpoperationpassthrough.c		\
+	gimpoperationpassthrough.h		\
+	gimpoperationreplace.c			\
+	gimpoperationreplace.h			\
+	gimpoperationsplit.c			\
+	gimpoperationsplit.h
+
+libapplayermodes_sse2_a_sources = \
+	gimpoperationlayermode-composite-sse2.c	\
+	\
+	gimpoperationnormal-sse2.c
+
+libapplayermodes_sse4_a_sources = \
+	gimpoperationnormal-sse4.c
+
+libapplayermodes_generic_a_SOURCES = $(libapplayermodes_generic_a_sources)
+libapplayermodes_sse2_a_SOURCES = $(libapplayermodes_sse2_a_sources)
+libapplayermodes_sse2_a_CFLAGS = $(SSE2_EXTRA_CFLAGS)
+libapplayermodes_sse4_a_SOURCES = $(libapplayermodes_sse4_a_sources)
+libapplayermodes_sse4_a_CFLAGS = $(SSE4_1_EXTRA_CFLAGS)
+libapplayermodes_a_SOURCES = 
+all: all-am
+
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+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu app/operations/layer-modes/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu app/operations/layer-modes/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
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+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-noinstLIBRARIES:
+	-test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
+
+libapplayermodes-generic.a: $(libapplayermodes_generic_a_OBJECTS) $(libapplayermodes_generic_a_DEPENDENCIES) $(EXTRA_libapplayermodes_generic_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libapplayermodes-generic.a
+	$(AM_V_AR)$(libapplayermodes_generic_a_AR) libapplayermodes-generic.a $(libapplayermodes_generic_a_OBJECTS) $(libapplayermodes_generic_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libapplayermodes-generic.a
+
+libapplayermodes-sse2.a: $(libapplayermodes_sse2_a_OBJECTS) $(libapplayermodes_sse2_a_DEPENDENCIES) $(EXTRA_libapplayermodes_sse2_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libapplayermodes-sse2.a
+	$(AM_V_AR)$(libapplayermodes_sse2_a_AR) libapplayermodes-sse2.a $(libapplayermodes_sse2_a_OBJECTS) $(libapplayermodes_sse2_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libapplayermodes-sse2.a
+
+libapplayermodes-sse4.a: $(libapplayermodes_sse4_a_OBJECTS) $(libapplayermodes_sse4_a_DEPENDENCIES) $(EXTRA_libapplayermodes_sse4_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libapplayermodes-sse4.a
+	$(AM_V_AR)$(libapplayermodes_sse4_a_AR) libapplayermodes-sse4.a $(libapplayermodes_sse4_a_OBJECTS) $(libapplayermodes_sse4_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libapplayermodes-sse4.a
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimp-layer-modes.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpoperationantierase.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpoperationbehind.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpoperationdissolve.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpoperationerase.Po@am__quote@ # am--include-marker
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+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+libapplayermodes.a: libapplayermodes-generic.a \
+                    libapplayermodes-sse2.a \
+                    libapplayermodes-sse4.a
+	$(AR) $(ARFLAGS) libapplayermodes.a \
+	  $(libapplayermodes_generic_a_OBJECTS) \
+	  $(libapplayermodes_sse2_a_OBJECTS) \
+	  $(libapplayermodes_sse4_a_OBJECTS)
+	$(RANLIB) libapplayermodes.a
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/app/operations/layer-modes/gimp-layer-modes.c b/app/operations/layer-modes/gimp-layer-modes.c
new file mode 100644
index 0000000..deb1f3d
--- /dev/null
+++ b/app/operations/layer-modes/gimp-layer-modes.c
@@ -0,0 +1,1522 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-layer-modes.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *                    Øyvind Kolås <pippin@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib-object.h>
+#include <gegl.h>
+
+#include "../operations-types.h"
+
+#include "gegl/gimp-babl.h"
+
+#include "gimpoperationlayermode.h"
+#include "gimpoperationlayermode-blend.h"
+
+#include "gimp-layer-modes.h"
+
+
+typedef struct _GimpLayerModeInfo GimpLayerModeInfo;
+
+struct _GimpLayerModeInfo
+{
+  GimpLayerMode             layer_mode;
+  const gchar              *op_name;
+  GimpLayerModeBlendFunc    blend_function;
+  GimpLayerModeFlags        flags;
+  GimpLayerModeContext      context;
+  GimpLayerCompositeMode    paint_composite_mode;
+  GimpLayerCompositeMode    composite_mode;
+  GimpLayerColorSpace       composite_space;
+  GimpLayerColorSpace       blend_space;
+};
+
+
+/*  static variables  */
+
+static const GimpLayerModeInfo layer_mode_infos[] =
+{
+  { GIMP_LAYER_MODE_NORMAL_LEGACY,
+
+    .op_name              = "gimp:normal",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE  |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DISSOLVE,
+
+    .op_name              = "gimp:dissolve",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION
+  },
+
+  { GIMP_LAYER_MODE_BEHIND_LEGACY,
+
+    .op_name              = "gimp:behind",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_PAINT |
+                            GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_MULTIPLY_LEGACY,
+
+    .op_name              = "gimp:multiply-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SCREEN_LEGACY,
+
+    .op_name              = "gimp:screen-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_OVERLAY_LEGACY,
+
+    .op_name              = "gimp:softlight-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIFFERENCE_LEGACY,
+
+    .op_name              = "gimp:difference-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_ADDITION_LEGACY,
+
+    .op_name              = "gimp:addition-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SUBTRACT_LEGACY,
+
+    .op_name              = "gimp:subtract-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY,
+
+    .op_name              = "gimp:darken-only-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY,
+
+    .op_name              = "gimp:lighten-only-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_HUE_LEGACY,
+
+    .op_name              = "gimp:hsv-hue-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_SATURATION_LEGACY,
+
+    .op_name              = "gimp:hsv-saturation-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSL_COLOR_LEGACY,
+
+    .op_name              = "gimp:hsl-color-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_VALUE_LEGACY,
+
+    .op_name              = "gimp:hsv-value-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIVIDE_LEGACY,
+
+    .op_name              = "gimp:divide-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DODGE_LEGACY,
+
+    .op_name              = "gimp:dodge-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_BURN_LEGACY,
+
+    .op_name              = "gimp:burn-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HARDLIGHT_LEGACY,
+
+    .op_name              = "gimp:hardlight-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SOFTLIGHT_LEGACY,
+
+    .op_name              = "gimp:softlight-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY,
+
+    .op_name              = "gimp:grain-extract-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY,
+
+    .op_name              = "gimp:grain-merge-legacy",
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_color_erase,
+    .flags                = GIMP_LAYER_MODE_FLAG_LEGACY                    |
+                            GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE  |
+                            GIMP_LAYER_MODE_FLAG_SUBTRACTIVE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_PAINT |
+                            GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_OVERLAY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_overlay,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LCH_HUE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_hue,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_LCH_CHROMA,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_chroma,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_LCH_COLOR,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_color,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_LCH_LIGHTNESS,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lch_lightness,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_LAB
+  },
+
+  { GIMP_LAYER_MODE_NORMAL,
+
+    .op_name              = "gimp:normal",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_BEHIND,
+
+    .op_name              = "gimp:behind",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_PAINT |
+                            GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_MULTIPLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_multiply,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_SCREEN,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_screen,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIFFERENCE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_difference,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_ADDITION,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_addition,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_SUBTRACT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_subtract,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_DARKEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_darken_only,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+    /* no blend_space: reuse composite space, no conversion thus fewer copies */
+  },
+
+  { GIMP_LAYER_MODE_LIGHTEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_lighten_only,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+    /* no blend_space: reuse composite space, no conversion thus fewer copies */
+  },
+
+  { GIMP_LAYER_MODE_HSV_HUE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsv_hue,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_SATURATION,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsv_saturation,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSL_COLOR,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsl_color,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HSV_VALUE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hsv_value,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_DIVIDE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_divide,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_DODGE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_dodge,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_BURN,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_burn,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HARDLIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hardlight,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_SOFTLIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_softlight,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_EXTRACT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_grain_extract,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_GRAIN_MERGE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_grain_merge,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_VIVID_LIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_vivid_light,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_PIN_LIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_pin_light,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LINEAR_LIGHT,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_linear_light,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_HARD_MIX,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_hard_mix,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_EXCLUSION,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_exclusion,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LINEAR_BURN,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_linear_burn,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_luma_darken_only,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_luma_lighten_only,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL
+  },
+
+  { GIMP_LAYER_MODE_LUMINANCE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_luminance,
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_COLOR_ERASE,
+
+    .op_name              = "gimp:layer-mode",
+    .blend_function       = gimp_operation_layer_mode_blend_color_erase,
+    .flags                = GIMP_LAYER_MODE_FLAG_SUBTRACTIVE,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+    .blend_space          = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_ERASE,
+
+    .op_name              = "gimp:erase",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_SUBTRACTIVE           |
+                            GIMP_LAYER_MODE_FLAG_ALPHA_ONLY            |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_MERGE,
+
+    .op_name              = "gimp:merge",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_SPLIT,
+
+    .op_name              = "gimp:split",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_SUBTRACTIVE               |
+                            GIMP_LAYER_MODE_FLAG_ALPHA_ONLY                |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_ALL,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP
+  },
+
+  { GIMP_LAYER_MODE_PASS_THROUGH,
+
+    .op_name              = "gimp:pass-through",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE    |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_GROUP,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_REPLACE,
+
+    .op_name              = "gimp:replace",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_TRIVIAL,
+    .context              = GIMP_LAYER_MODE_CONTEXT_FILTER,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_space      = GIMP_LAYER_COLOR_SPACE_RGB_LINEAR
+  },
+
+  { GIMP_LAYER_MODE_ANTI_ERASE,
+
+    .op_name              = "gimp:anti-erase",
+    .flags                = GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     |
+                            GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE |
+                            GIMP_LAYER_MODE_FLAG_ALPHA_ONLY,
+    .paint_composite_mode = GIMP_LAYER_COMPOSITE_UNION,
+    .composite_mode       = GIMP_LAYER_COMPOSITE_UNION
+  }
+};
+
+static const GimpLayerMode layer_mode_group_default[] =
+{
+  GIMP_LAYER_MODE_PASS_THROUGH,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_REPLACE,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_NORMAL,
+  GIMP_LAYER_MODE_DISSOLVE,
+  GIMP_LAYER_MODE_BEHIND,
+  GIMP_LAYER_MODE_COLOR_ERASE,
+  GIMP_LAYER_MODE_ERASE,
+  GIMP_LAYER_MODE_ANTI_ERASE,
+  GIMP_LAYER_MODE_MERGE,
+  GIMP_LAYER_MODE_SPLIT,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_LIGHTEN_ONLY,
+  GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,
+  GIMP_LAYER_MODE_SCREEN,
+  GIMP_LAYER_MODE_DODGE,
+  GIMP_LAYER_MODE_ADDITION,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DARKEN_ONLY,
+  GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,
+  GIMP_LAYER_MODE_MULTIPLY,
+  GIMP_LAYER_MODE_BURN,
+  GIMP_LAYER_MODE_LINEAR_BURN,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_OVERLAY,
+  GIMP_LAYER_MODE_SOFTLIGHT,
+  GIMP_LAYER_MODE_HARDLIGHT,
+  GIMP_LAYER_MODE_VIVID_LIGHT,
+  GIMP_LAYER_MODE_PIN_LIGHT,
+  GIMP_LAYER_MODE_LINEAR_LIGHT,
+  GIMP_LAYER_MODE_HARD_MIX,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DIFFERENCE,
+  GIMP_LAYER_MODE_EXCLUSION,
+  GIMP_LAYER_MODE_SUBTRACT,
+  GIMP_LAYER_MODE_GRAIN_EXTRACT,
+  GIMP_LAYER_MODE_GRAIN_MERGE,
+  GIMP_LAYER_MODE_DIVIDE,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_HSV_HUE,
+  GIMP_LAYER_MODE_HSV_SATURATION,
+  GIMP_LAYER_MODE_HSL_COLOR,
+  GIMP_LAYER_MODE_HSV_VALUE,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_LCH_HUE,
+  GIMP_LAYER_MODE_LCH_CHROMA,
+  GIMP_LAYER_MODE_LCH_COLOR,
+  GIMP_LAYER_MODE_LCH_LIGHTNESS,
+  GIMP_LAYER_MODE_LUMINANCE
+};
+
+static const GimpLayerMode layer_mode_group_legacy[] =
+{
+  GIMP_LAYER_MODE_NORMAL_LEGACY,
+  GIMP_LAYER_MODE_DISSOLVE,
+  GIMP_LAYER_MODE_BEHIND_LEGACY,
+  GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY,
+  GIMP_LAYER_MODE_SCREEN_LEGACY,
+  GIMP_LAYER_MODE_DODGE_LEGACY,
+  GIMP_LAYER_MODE_ADDITION_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY,
+  GIMP_LAYER_MODE_MULTIPLY_LEGACY,
+  GIMP_LAYER_MODE_BURN_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_OVERLAY,
+  GIMP_LAYER_MODE_SOFTLIGHT_LEGACY,
+  GIMP_LAYER_MODE_HARDLIGHT_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_DIFFERENCE_LEGACY,
+  GIMP_LAYER_MODE_SUBTRACT_LEGACY,
+  GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY,
+  GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY,
+  GIMP_LAYER_MODE_DIVIDE_LEGACY,
+
+  GIMP_LAYER_MODE_SEPARATOR,
+
+  GIMP_LAYER_MODE_HSV_HUE_LEGACY,
+  GIMP_LAYER_MODE_HSV_SATURATION_LEGACY,
+  GIMP_LAYER_MODE_HSL_COLOR_LEGACY,
+  GIMP_LAYER_MODE_HSV_VALUE_LEGACY
+};
+
+static const GimpLayerMode layer_mode_groups[][2] =
+{
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_NORMAL,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_NORMAL_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DISSOLVE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DISSOLVE
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_BEHIND,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_BEHIND_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_MULTIPLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_MULTIPLY_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SCREEN,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_SCREEN_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_OVERLAY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DIFFERENCE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DIFFERENCE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_ADDITION,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_ADDITION_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SUBTRACT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_SUBTRACT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DARKEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LIGHTEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSV_HUE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSV_HUE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSV_SATURATION,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSV_SATURATION_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSL_COLOR,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSL_COLOR_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HSV_VALUE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HSV_VALUE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DIVIDE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DIVIDE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_DODGE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_DODGE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_BURN,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_BURN_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HARDLIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_HARDLIGHT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SOFTLIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_SOFTLIGHT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_GRAIN_EXTRACT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_GRAIN_MERGE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_COLOR_ERASE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_VIVID_LIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_PIN_LIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LINEAR_LIGHT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_HARD_MIX,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_EXCLUSION,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LINEAR_BURN,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_LUMINANCE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_ERASE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_MERGE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_SPLIT,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_PASS_THROUGH,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1,
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_REPLACE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  },
+
+  { [GIMP_LAYER_MODE_GROUP_DEFAULT] = GIMP_LAYER_MODE_ANTI_ERASE,
+    [GIMP_LAYER_MODE_GROUP_LEGACY ] = -1
+  }
+};
+
+
+/*  public functions  */
+
+void
+gimp_layer_modes_init (void)
+{
+  gint i;
+
+  for (i = 0; i < G_N_ELEMENTS (layer_mode_infos); i++)
+    {
+      gimp_assert ((GimpLayerMode) i == layer_mode_infos[i].layer_mode);
+    }
+}
+
+static const GimpLayerModeInfo *
+gimp_layer_mode_info (GimpLayerMode mode)
+{
+  g_return_val_if_fail (mode >= 0 && mode < G_N_ELEMENTS (layer_mode_infos),
+                        &layer_mode_infos[0]);
+
+  return &layer_mode_infos[mode];
+}
+
+gboolean
+gimp_layer_mode_is_legacy (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_LEGACY) != 0;
+}
+
+gboolean
+gimp_layer_mode_is_blend_space_mutable (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE) == 0;
+}
+
+gboolean
+gimp_layer_mode_is_composite_space_mutable (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE) == 0;
+}
+
+gboolean
+gimp_layer_mode_is_composite_mode_mutable (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE) == 0;
+}
+
+gboolean
+gimp_layer_mode_is_subtractive (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_SUBTRACTIVE) != 0;
+}
+
+gboolean
+gimp_layer_mode_is_alpha_only (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_ALPHA_ONLY) != 0;
+}
+
+gboolean
+gimp_layer_mode_is_trivial (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return FALSE;
+
+  return (info->flags & GIMP_LAYER_MODE_FLAG_TRIVIAL) != 0;
+}
+
+GimpLayerColorSpace
+gimp_layer_mode_get_blend_space (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COLOR_SPACE_RGB_LINEAR;
+
+  return info->blend_space;
+}
+
+GimpLayerColorSpace
+gimp_layer_mode_get_composite_space (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COLOR_SPACE_RGB_LINEAR;
+
+  return info->composite_space;
+}
+
+GimpLayerCompositeMode
+gimp_layer_mode_get_composite_mode (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COMPOSITE_UNION;
+
+  return info->composite_mode;
+}
+
+GimpLayerCompositeMode
+gimp_layer_mode_get_paint_composite_mode (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return GIMP_LAYER_COMPOSITE_UNION;
+
+  return info->paint_composite_mode;
+}
+
+const gchar *
+gimp_layer_mode_get_operation (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return "gimp:layer-mode";
+
+  return info->op_name;
+}
+
+GimpLayerModeFunc
+gimp_layer_mode_get_function (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo  *info = gimp_layer_mode_info (mode);
+  static GimpLayerModeFunc  funcs[G_N_ELEMENTS (layer_mode_infos)];
+
+  if (! info)
+    info = layer_mode_infos;
+
+  mode = info - layer_mode_infos;
+
+  if (! funcs[mode])
+    {
+      GeglNode      *node;
+      GeglOperation *operation;
+
+      node = gegl_node_new_child (NULL,
+                                  "operation", info->op_name,
+                                  NULL);
+
+      operation = gegl_node_get_gegl_operation (node);
+
+      funcs[mode] = GIMP_OPERATION_LAYER_MODE_GET_CLASS (operation)->process;
+
+      g_object_unref (node);
+    }
+
+  return funcs[mode];
+}
+
+GimpLayerModeBlendFunc
+gimp_layer_mode_get_blend_function (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return NULL;
+
+  return info->blend_function;
+}
+
+GimpLayerModeContext
+gimp_layer_mode_get_context (GimpLayerMode mode)
+{
+  const GimpLayerModeInfo *info = gimp_layer_mode_info (mode);
+
+  if (! info)
+    return 0;
+
+  return info->context;
+}
+
+GimpLayerMode *
+gimp_layer_mode_get_context_array (GimpLayerMode         mode,
+                                   GimpLayerModeContext  context,
+                                   gint                 *n_modes)
+{
+  GimpLayerModeGroup   group;
+  const GimpLayerMode *group_modes;
+  gint                 n_group_modes;
+  GimpLayerMode       *array;
+  gint                 i;
+
+  group = gimp_layer_mode_get_group (mode);
+
+  group_modes = gimp_layer_mode_get_group_array (group, &n_group_modes);
+
+  array = g_new0 (GimpLayerMode, n_group_modes);
+  *n_modes = 0;
+
+  for (i = 0; i < n_group_modes; i++)
+    {
+      if (group_modes[i] != GIMP_LAYER_MODE_SEPARATOR &&
+          (gimp_layer_mode_get_context (group_modes[i]) & context))
+        {
+          array[*n_modes] = group_modes[i];
+          (*n_modes)++;
+        }
+    }
+
+  return array;
+}
+
+static gboolean
+is_mode_in_array (const GimpLayerMode *modes,
+                  gint                 n_modes,
+                  GimpLayerMode        mode)
+{
+  gint i;
+
+  for (i = 0; i < n_modes; i++)
+    {
+      if (modes[i] == mode)
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
+GimpLayerModeGroup
+gimp_layer_mode_get_group (GimpLayerMode mode)
+{
+  if (is_mode_in_array (layer_mode_group_default,
+                        G_N_ELEMENTS (layer_mode_group_default), mode))
+    {
+      return GIMP_LAYER_MODE_GROUP_DEFAULT;
+    }
+  else if (is_mode_in_array (layer_mode_group_legacy,
+                             G_N_ELEMENTS (layer_mode_group_legacy), mode))
+    {
+      return GIMP_LAYER_MODE_GROUP_LEGACY;
+    }
+
+  return GIMP_LAYER_MODE_GROUP_DEFAULT;
+}
+
+const GimpLayerMode *
+gimp_layer_mode_get_group_array (GimpLayerModeGroup  group,
+                                 gint               *n_modes)
+{
+  g_return_val_if_fail (n_modes != NULL, NULL);
+
+  switch (group)
+    {
+    case GIMP_LAYER_MODE_GROUP_DEFAULT:
+      *n_modes = G_N_ELEMENTS (layer_mode_group_default);
+      return layer_mode_group_default;
+
+    case GIMP_LAYER_MODE_GROUP_LEGACY:
+      *n_modes = G_N_ELEMENTS (layer_mode_group_legacy);
+      return layer_mode_group_legacy;
+
+    default:
+      g_return_val_if_reached (NULL);
+    }
+}
+
+gboolean
+gimp_layer_mode_get_for_group (GimpLayerMode       old_mode,
+                               GimpLayerModeGroup  new_group,
+                               GimpLayerMode      *new_mode)
+{
+  gint i;
+
+  g_return_val_if_fail (new_mode != NULL, FALSE);
+
+  for (i = 0; i < G_N_ELEMENTS (layer_mode_groups); i++)
+    {
+      if (is_mode_in_array (layer_mode_groups[i], 2, old_mode))
+        {
+          *new_mode = layer_mode_groups[i][new_group];
+
+          if (*new_mode != -1)
+            return TRUE;
+
+          return FALSE;
+        }
+    }
+
+  *new_mode = -1;
+
+  return FALSE;
+}
+
+const Babl *
+gimp_layer_mode_get_format (GimpLayerMode           mode,
+                            GimpLayerColorSpace     blend_space,
+                            GimpLayerColorSpace     composite_space,
+                            GimpLayerCompositeMode  composite_mode,
+                            const Babl             *preferred_format)
+{
+  GimpLayerCompositeRegion composite_region;
+
+  /* for now, all modes perform i/o in the composite space. */
+  (void) mode;
+  (void) blend_space;
+
+  if (composite_space == GIMP_LAYER_COLOR_SPACE_AUTO)
+    composite_space = gimp_layer_mode_get_composite_space (mode);
+
+  if (composite_mode == GIMP_LAYER_COMPOSITE_AUTO)
+    composite_mode = gimp_layer_mode_get_composite_mode (mode);
+
+  composite_region = gimp_layer_mode_get_included_region (mode, composite_mode);
+
+  if (gimp_layer_mode_is_alpha_only (mode))
+    {
+      if (composite_region != GIMP_LAYER_COMPOSITE_REGION_UNION)
+        {
+          /* alpha-only layer modes don't combine colors in non-union composite
+           * modes, hence we can disregard the composite space.
+           */
+          composite_space = GIMP_LAYER_COLOR_SPACE_AUTO;
+        }
+    }
+  else if (gimp_layer_mode_is_trivial (mode))
+    {
+      if (! (composite_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION))
+        {
+          /* trivial layer modes don't combine colors when only the source
+           * region is included, hence we can disregard the composite space.
+           */
+          composite_space = GIMP_LAYER_COLOR_SPACE_AUTO;
+        }
+    }
+
+  switch (composite_space)
+    {
+    case GIMP_LAYER_COLOR_SPACE_AUTO:
+      /* compositing is color-space agnostic.  return a format that has a fast
+       * conversion path to/from the preferred format.
+       */
+      if (! preferred_format || gimp_babl_format_get_linear (preferred_format))
+        return babl_format ("RGBA float");
+      else
+        return babl_format ("R'G'B'A float");
+
+    case GIMP_LAYER_COLOR_SPACE_RGB_LINEAR:
+      return babl_format ("RGBA float");
+
+    case GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL:
+      return babl_format ("R'G'B'A float");
+
+    case GIMP_LAYER_COLOR_SPACE_LAB:
+      return babl_format ("CIE Lab alpha float");
+    }
+
+  g_return_val_if_reached (babl_format ("RGBA float"));
+}
+
+GimpLayerCompositeRegion
+gimp_layer_mode_get_included_region (GimpLayerMode          mode,
+                                     GimpLayerCompositeMode composite_mode)
+{
+  if (composite_mode == GIMP_LAYER_COMPOSITE_AUTO)
+    composite_mode = gimp_layer_mode_get_composite_mode (mode);
+
+  switch (composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+      return GIMP_LAYER_COMPOSITE_REGION_UNION;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      return GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      return GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      return GIMP_LAYER_COMPOSITE_REGION_INTERSECTION;
+
+    default:
+      g_return_val_if_reached (GIMP_LAYER_COMPOSITE_REGION_INTERSECTION);
+    }
+}
diff --git a/app/operations/layer-modes/gimp-layer-modes.h b/app/operations/layer-modes/gimp-layer-modes.h
new file mode 100644
index 0000000..30c5e15
--- /dev/null
+++ b/app/operations/layer-modes/gimp-layer-modes.h
@@ -0,0 +1,73 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimp-layer-modes.h
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *                    Øyvind Kolås <pippin@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_LAYER_MODES_H__
+#define __GIMP_LAYER_MODES_H__
+
+
+void                       gimp_layer_modes_init                      (void);
+
+gboolean                   gimp_layer_mode_is_legacy                  (GimpLayerMode           mode);
+
+gboolean                   gimp_layer_mode_is_blend_space_mutable     (GimpLayerMode           mode);
+gboolean                   gimp_layer_mode_is_composite_space_mutable (GimpLayerMode           mode);
+gboolean                   gimp_layer_mode_is_composite_mode_mutable  (GimpLayerMode           mode);
+
+gboolean                   gimp_layer_mode_is_subtractive             (GimpLayerMode           mode);
+gboolean                   gimp_layer_mode_is_alpha_only              (GimpLayerMode           mode);
+gboolean                   gimp_layer_mode_is_trivial                 (GimpLayerMode           mode);
+
+GimpLayerColorSpace        gimp_layer_mode_get_blend_space            (GimpLayerMode           mode);
+GimpLayerColorSpace        gimp_layer_mode_get_composite_space        (GimpLayerMode           mode);
+GimpLayerCompositeMode     gimp_layer_mode_get_composite_mode         (GimpLayerMode           mode);
+GimpLayerCompositeMode     gimp_layer_mode_get_paint_composite_mode   (GimpLayerMode           mode);
+
+const gchar              * gimp_layer_mode_get_operation              (GimpLayerMode           mode);
+
+GimpLayerModeFunc          gimp_layer_mode_get_function               (GimpLayerMode           mode);
+GimpLayerModeBlendFunc     gimp_layer_mode_get_blend_function         (GimpLayerMode           mode);
+
+GimpLayerModeContext       gimp_layer_mode_get_context                (GimpLayerMode           mode);
+
+GimpLayerMode            * gimp_layer_mode_get_context_array          (GimpLayerMode           mode,
+                                                                       GimpLayerModeContext    context,
+                                                                       gint                   *n_modes);
+
+GimpLayerModeGroup         gimp_layer_mode_get_group                  (GimpLayerMode           mode);
+
+const GimpLayerMode      * gimp_layer_mode_get_group_array            (GimpLayerModeGroup      group,
+                                                                       gint                   *n_modes);
+
+gboolean                   gimp_layer_mode_get_for_group              (GimpLayerMode           old_mode,
+                                                                       GimpLayerModeGroup      new_group,
+                                                                       GimpLayerMode          *new_mode);
+
+const Babl               * gimp_layer_mode_get_format                 (GimpLayerMode           mode,
+                                                                       GimpLayerColorSpace     blend_space,
+                                                                       GimpLayerColorSpace     composite_space,
+                                                                       GimpLayerCompositeMode  composite_mode,
+                                                                       const Babl             *preferred_format);
+
+GimpLayerCompositeRegion   gimp_layer_mode_get_included_region        (GimpLayerMode           mode,
+                                                                       GimpLayerCompositeMode  composite_mode);
+
+
+#endif /* __GIMP_LAYER_MODES_H__ */
diff --git a/app/operations/layer-modes/gimpoperationantierase.c b/app/operations/layer-modes/gimpoperationantierase.c
new file mode 100644
index 0000000..3fb2947
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationantierase.c
@@ -0,0 +1,188 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationantierase.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationantierase.h"
+
+
+
+static gboolean                   gimp_operation_anti_erase_process             (GeglOperation          *op,
+                                                                                 void                   *in,
+                                                                                 void                   *layer,
+                                                                                 void                   *mask,
+                                                                                 void                   *out,
+                                                                                 glong                   samples,
+                                                                                 const GeglRectangle    *roi,
+                                                                                 gint                    level);
+static GimpLayerCompositeRegion   gimp_operation_anti_erase_get_affected_region (GimpOperationLayerMode *layer_mode);
+
+
+G_DEFINE_TYPE (GimpOperationAntiErase, gimp_operation_anti_erase,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_anti_erase_class_init (GimpOperationAntiEraseClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:anti-erase",
+                                 "description", "GIMP anti erase mode operation",
+                                 NULL);
+
+  layer_mode_class->process             = gimp_operation_anti_erase_process;
+  layer_mode_class->get_affected_region = gimp_operation_anti_erase_get_affected_region;
+}
+
+static void
+gimp_operation_anti_erase_init (GimpOperationAntiErase *self)
+{
+}
+
+static gboolean
+gimp_operation_anti_erase_process (GeglOperation       *op,
+                                   void                *in_p,
+                                   void                *layer_p,
+                                   void                *mask_p,
+                                   void                *out_p,
+                                   glong                samples,
+                                   const GeglRectangle *roi,
+                                   gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat value = opacity;
+          gint   b;
+
+          if (has_mask)
+            value *= *mask;
+
+          out[ALPHA] = in[ALPHA] + (1.0 - in[ALPHA]) * layer[ALPHA] * value;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      while (samples--)
+        {
+          gint b;
+
+          out[ALPHA] = in[ALPHA];
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          in  += 4;
+          out += 4;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat value = opacity;
+          gint   b;
+
+          if (has_mask)
+            value *= *mask;
+
+          out[ALPHA] = layer[ALPHA] * value;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      while (samples--)
+        {
+          gfloat value = opacity;
+          gint   b;
+
+          if (has_mask)
+            value *= *mask;
+
+          out[ALPHA] = in[ALPHA] * layer[ALPHA] * value;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+    }
+
+  return TRUE;
+}
+
+static GimpLayerCompositeRegion
+gimp_operation_anti_erase_get_affected_region (GimpOperationLayerMode *layer_mode)
+{
+  return GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+}
diff --git a/app/operations/layer-modes/gimpoperationantierase.h b/app/operations/layer-modes/gimpoperationantierase.h
new file mode 100644
index 0000000..0c5ddf8
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationantierase.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationantierase.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_ANTI_ERASE_H__
+#define __GIMP_OPERATION_ANTI_ERASE_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_ANTI_ERASE            (gimp_operation_anti_erase_get_type ())
+#define GIMP_OPERATION_ANTI_ERASE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_ANTI_ERASE, GimpOperationAntiErase))
+#define GIMP_OPERATION_ANTI_ERASE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_ANTI_ERASE, GimpOperationAntiEraseClass))
+#define GIMP_IS_OPERATION_ANTI_ERASE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_ANTI_ERASE))
+#define GIMP_IS_OPERATION_ANTI_ERASE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_ANTI_ERASE))
+#define GIMP_OPERATION_ANTI_ERASE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_ANTI_ERASE, GimpOperationAntiEraseClass))
+
+
+typedef struct _GimpOperationAntiErase      GimpOperationAntiErase;
+typedef struct _GimpOperationAntiEraseClass GimpOperationAntiEraseClass;
+
+struct _GimpOperationAntiErase
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationAntiEraseClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_anti_erase_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_ANTI_ERASE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationbehind.c b/app/operations/layer-modes/gimpoperationbehind.c
new file mode 100644
index 0000000..1dc2630
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationbehind.c
@@ -0,0 +1,236 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationbehind.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationbehind.h"
+
+
+
+static gboolean   gimp_operation_behind_process (GeglOperation       *op,
+                                                 void                *in,
+                                                 void                *layer,
+                                                 void                *mask,
+                                                 void                *out,
+                                                 glong                samples,
+                                                 const GeglRectangle *roi,
+                                                 gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationBehind, gimp_operation_behind,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_behind_class_init (GimpOperationBehindClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:behind",
+                                 "description", "GIMP behind mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_behind_process;
+}
+
+static void
+gimp_operation_behind_init (GimpOperationBehind *self)
+{
+}
+
+static gboolean
+gimp_operation_behind_process (GeglOperation       *op,
+                               void                *in_p,
+                               void                *layer_p,
+                               void                *mask_p,
+                               void                *out_p,
+                               glong                samples,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat src1_alpha = in[ALPHA];
+          gfloat src2_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            src2_alpha *= *mask;
+
+          new_alpha = src2_alpha + (1.0 - src2_alpha) * src1_alpha;
+
+          if (new_alpha)
+            {
+              gfloat ratio = in[ALPHA] / new_alpha;
+              gfloat compl_ratio = 1.0f - ratio;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b] * ratio + layer[b] * compl_ratio;
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      while (samples--)
+        {
+          gfloat src1_alpha = in[ALPHA];
+          gfloat new_alpha;
+          gint   b;
+
+          new_alpha = src1_alpha;
+
+          if (new_alpha)
+            {
+              for (b = RED; b < ALPHA; b++)
+                out[b] = in[b];
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                out[b] = layer[b];
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat src1_alpha = in[ALPHA];
+          gfloat src2_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            src2_alpha *= *mask;
+
+          new_alpha = src2_alpha;
+
+          if (new_alpha)
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b] + (in[b] - layer[b]) * src1_alpha;
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+      case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      while (samples--)
+        {
+          gfloat src1_alpha = in[ALPHA];
+          gfloat src2_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            src2_alpha *= *mask;
+
+          new_alpha = src1_alpha * src2_alpha;
+
+          if (new_alpha)
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationbehind.h b/app/operations/layer-modes/gimpoperationbehind.h
new file mode 100644
index 0000000..46b9ac4
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationbehind.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationbehind.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_BEHIND_H__
+#define __GIMP_OPERATION_BEHIND_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_BEHIND            (gimp_operation_behind_get_type ())
+#define GIMP_OPERATION_BEHIND(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_BEHIND, GimpOperationBehind))
+#define GIMP_OPERATION_BEHIND_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_BEHIND, GimpOperationBehindClass))
+#define GIMP_IS_OPERATION_BEHIND(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_BEHIND))
+#define GIMP_IS_OPERATION_BEHIND_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_BEHIND))
+#define GIMP_OPERATION_BEHIND_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_BEHIND, GimpOperationBehindClass))
+
+
+typedef struct _GimpOperationBehind      GimpOperationBehind;
+typedef struct _GimpOperationBehindClass GimpOperationBehindClass;
+
+struct _GimpOperationBehind
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationBehindClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType    gimp_operation_behind_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_BEHIND_H__ */
diff --git a/app/operations/layer-modes/gimpoperationdissolve.c b/app/operations/layer-modes/gimpoperationdissolve.c
new file mode 100644
index 0000000..293fade
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationdissolve.c
@@ -0,0 +1,168 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdissolve.c
+ * Copyright (C) 2012 Ville Sokk <ville.sokk@gmail.com>
+ *               2012 Øyvind Kolås <pippin@gimp.org>
+ *               2003 Helvetix Victorinox
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationdissolve.h"
+
+
+#define RANDOM_TABLE_SIZE 4096
+
+
+static gboolean                   gimp_operation_dissolve_process             (GeglOperation          *op,
+                                                                               void                   *in,
+                                                                               void                   *layer,
+                                                                               void                   *mask,
+                                                                               void                   *out,
+                                                                               glong                   samples,
+                                                                               const GeglRectangle    *result,
+                                                                               gint                    level);
+static GimpLayerCompositeRegion   gimp_operation_dissolve_get_affected_region (GimpOperationLayerMode *layer_mode);
+
+
+G_DEFINE_TYPE (GimpOperationDissolve, gimp_operation_dissolve,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static gint32 random_table[RANDOM_TABLE_SIZE];
+
+
+static void
+gimp_operation_dissolve_class_init (GimpOperationDissolveClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+  GRand                       *gr;
+  gint                         i;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:dissolve",
+                                 "description", "GIMP dissolve mode operation",
+                                 "categories",  "compositors",
+                                 NULL);
+
+  layer_mode_class->process             = gimp_operation_dissolve_process;
+  layer_mode_class->get_affected_region = gimp_operation_dissolve_get_affected_region;
+
+  /* generate a table of random seeds */
+  gr = g_rand_new_with_seed (314159265);
+  for (i = 0; i < RANDOM_TABLE_SIZE; i++)
+    random_table[i] = g_rand_int (gr);
+
+  g_rand_free (gr);
+}
+
+static void
+gimp_operation_dissolve_init (GimpOperationDissolve *self)
+{
+}
+
+static gboolean
+gimp_operation_dissolve_process (GeglOperation       *op,
+                                 void                *in_p,
+                                 void                *layer_p,
+                                 void                *mask_p,
+                                 void                *out_p,
+                                 glong                samples,
+                                 const GeglRectangle *result,
+                                 gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+  gint                    x, y;
+
+  for (y = result->y; y < result->y + result->height; y++)
+    {
+      GRand *gr = g_rand_new_with_seed (random_table[y % RANDOM_TABLE_SIZE]);
+
+      /* fast forward through the rows pseudo random sequence */
+      for (x = 0; x < result->x; x++)
+        g_rand_int (gr);
+
+      for (x = result->x; x < result->x + result->width; x++)
+        {
+          gfloat value = layer[ALPHA] * opacity * 255;
+
+          if (has_mask)
+            value *= *mask;
+
+          if (g_rand_int_range (gr, 0, 255) >= value)
+            {
+              out[0] = in[0];
+              out[1] = in[1];
+              out[2] = in[2];
+
+              if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_UNION ||
+                  layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP)
+                {
+                  out[3] = in[3];
+                }
+              else
+                {
+                  out[3] = 0.0f;
+                }
+            }
+          else
+            {
+              out[0] = layer[0];
+              out[1] = layer[1];
+              out[2] = layer[2];
+
+              if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_UNION ||
+                  layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER)
+                {
+                  out[3] = 1.0f;
+                }
+              else
+                {
+                  out[3] = in[3];
+                }
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+
+      g_rand_free (gr);
+    }
+
+  return TRUE;
+}
+
+static GimpLayerCompositeRegion
+gimp_operation_dissolve_get_affected_region (GimpOperationLayerMode *layer_mode)
+{
+  return GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+}
diff --git a/app/operations/layer-modes/gimpoperationdissolve.h b/app/operations/layer-modes/gimpoperationdissolve.h
new file mode 100644
index 0000000..d448918
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationdissolve.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationdissolve.h
+ * Copyright (C) 2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_DISSOLVE_H__
+#define __GIMP_OPERATION_DISSOLVE_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_DISSOLVE            (gimp_operation_dissolve_get_type ())
+#define GIMP_OPERATION_DISSOLVE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_DISSOLVE, GimpOperationDissolve))
+#define GIMP_OPERATION_DISSOLVE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_DISSOLVE, GimpOperationDissolveClass))
+#define GIMP_IS_OPERATION_DISSOLVE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_DISSOLVE))
+#define GIMP_IS_OPERATION_DISSOLVE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_DISSOLVE))
+#define GIMP_OPERATION_DISSOLVE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_DISSOLVE, GimpOperationDissolveClass))
+
+
+typedef struct _GimpOperationDissolve      GimpOperationDissolve;
+typedef struct _GimpOperationDissolveClass GimpOperationDissolveClass;
+
+struct _GimpOperationDissolveClass
+{
+  GimpOperationLayerModeClass parent_class;
+};
+
+struct _GimpOperationDissolve
+{
+  GimpOperationLayerMode parent_instance;
+};
+
+
+GType   gimp_operation_dissolve_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_DISSOLVE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationerase.c b/app/operations/layer-modes/gimpoperationerase.c
new file mode 100644
index 0000000..aae6eac
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationerase.c
@@ -0,0 +1,214 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationerase.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2012 Ville Sokk <ville.sokk@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationerase.h"
+
+
+static gboolean   gimp_operation_erase_process (GeglOperation       *op,
+                                                void                *in,
+                                                void                *layer,
+                                                void                *mask,
+                                                void                *out,
+                                                glong                samples,
+                                                const GeglRectangle *roi,
+                                                gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationErase, gimp_operation_erase,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_erase_class_init (GimpOperationEraseClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:erase",
+                                 "description", "GIMP erase mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_erase_process;
+}
+
+static void
+gimp_operation_erase_init (GimpOperationErase *self)
+{
+}
+
+static gboolean
+gimp_operation_erase_process (GeglOperation       *op,
+                              void                *in_p,
+                              void                *layer_p,
+                              void                *mask_p,
+                              void                *out_p,
+                              glong                samples,
+                              const GeglRectangle *roi,
+                              gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+      while (samples--)
+        {
+          gfloat layer_alpha;
+          gfloat new_alpha;
+          gint   b;
+
+          layer_alpha = layer[ALPHA] * opacity;
+
+          if (has_mask)
+            layer_alpha *= (*mask);
+
+          new_alpha = in[ALPHA] + layer_alpha - 2.0f * in[ALPHA] * layer_alpha;
+
+          if (new_alpha != 0.0f)
+            {
+              gfloat ratio;
+
+              ratio = (1.0f - in[ALPHA]) * layer_alpha / new_alpha;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = ratio * layer[b] + (1.0f - ratio) * in[b];
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask ++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat layer_alpha;
+          gfloat new_alpha;
+          gint   b;
+
+          layer_alpha = layer[ALPHA] * opacity;
+
+          if (has_mask)
+            layer_alpha *= (*mask);
+
+          new_alpha = (1.0f - layer_alpha) * in[ALPHA];
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask ++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat        layer_alpha;
+          gfloat        new_alpha;
+          const gfloat *src;
+          gint          b;
+
+          layer_alpha = layer[ALPHA] * opacity;
+
+          if (has_mask)
+            layer_alpha *= (*mask);
+
+          new_alpha = (1.0f - in[ALPHA]) * layer_alpha;
+
+          src = layer;
+
+          if (new_alpha == 0.0f)
+            src = in;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = src[b];
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask ++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      while (samples--)
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          out[ALPHA] = 0.0f;
+
+          in    += 4;
+          out   += 4;
+        }
+      break;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationerase.h b/app/operations/layer-modes/gimpoperationerase.h
new file mode 100644
index 0000000..fec309b
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationerase.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationerase.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_ERASE_H__
+#define __GIMP_OPERATION_ERASE_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_ERASE            (gimp_operation_erase_get_type ())
+#define GIMP_OPERATION_ERASE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_ERASE, GimpOperationErase))
+#define GIMP_OPERATION_ERASE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_ERASE, GimpOperationEraseClass))
+#define GIMP_IS_OPERATION_ERASE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_ERASE))
+#define GIMP_IS_OPERATION_ERASE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_ERASE))
+#define GIMP_OPERATION_ERASE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_ERASE, GimpOperationEraseClass))
+
+
+typedef struct _GimpOperationErase      GimpOperationErase;
+typedef struct _GimpOperationEraseClass GimpOperationEraseClass;
+
+struct _GimpOperationErase
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationEraseClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_erase_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_ERASE_MODE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationlayermode-blend.c b/app/operations/layer-modes/gimpoperationlayermode-blend.c
new file mode 100644
index 0000000..e107462
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode-blend.c
@@ -0,0 +1,1215 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-blend.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *               2017 Øyvind Kolås <pippin@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationlayermode-blend.h"
+
+
+#define EPSILON      1e-6f
+
+#define SAFE_DIV_MIN EPSILON
+#define SAFE_DIV_MAX (1.0f / SAFE_DIV_MIN)
+
+
+/*  local function prototypes  */
+
+static inline gfloat   safe_div (gfloat a,
+                                 gfloat b);
+
+
+/*  private functions  */
+
+
+/* returns a / b, clamped to [-SAFE_DIV_MAX, SAFE_DIV_MAX].
+ * if -SAFE_DIV_MIN <= a <= SAFE_DIV_MIN, returns 0.
+ */
+static inline gfloat
+safe_div (gfloat a,
+          gfloat b)
+{
+  gfloat result = 0.0f;
+
+  if (fabsf (a) > SAFE_DIV_MIN)
+    {
+      result = a / b;
+      result = CLAMP (result, -SAFE_DIV_MAX, SAFE_DIV_MAX);
+    }
+
+  return result;
+}
+
+
+/*  public functions  */
+
+
+/*  non-subtractive blending functions.  these functions must set comp[ALPHA]
+ *  to the same value as layer[ALPHA].  when in[ALPHA] or layer[ALPHA] are
+ *  zero, the value of comp[RED..BLUE] is unconstrained (in particular, it may
+ *  be NaN).
+ */
+
+
+void /* aka linear_dodge */
+gimp_operation_layer_mode_blend_addition (GeglOperation *operation,
+                                          const gfloat  *in,
+                                          const gfloat  *layer,
+                                          gfloat        *comp,
+                                          gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] + layer[c];
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_burn (GeglOperation *operation,
+                                      const gfloat  *in,
+                                      const gfloat  *layer,
+                                      gfloat        *comp,
+                                      gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = 1.0f - safe_div (1.0f - in[c], layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_darken_only (GeglOperation *operation,
+                                             const gfloat  *in,
+                                             const gfloat  *layer,
+                                             gfloat        *comp,
+                                             gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = MIN (in[c], layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_difference (GeglOperation *operation,
+                                            const gfloat  *in,
+                                            const gfloat  *layer,
+                                            gfloat        *comp,
+                                            gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = fabsf (in[c] - layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_divide (GeglOperation *operation,
+                                        const gfloat  *in,
+                                        const gfloat  *layer,
+                                        gfloat        *comp,
+                                        gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = safe_div (in[c], layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_dodge (GeglOperation *operation,
+                                       const gfloat  *in,
+                                       const gfloat  *layer,
+                                       gfloat        *comp,
+                                       gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = safe_div (in[c], 1.0f - layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_exclusion (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = 0.5f - 2.0f * (in[c] - 0.5f) * (layer[c] - 0.5f);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_grain_extract (GeglOperation *operation,
+                                               const gfloat  *in,
+                                               const gfloat  *layer,
+                                               gfloat        *comp,
+                                               gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] - layer[c] + 0.5f;
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_grain_merge (GeglOperation *operation,
+                                             const gfloat  *in,
+                                             const gfloat  *layer,
+                                             gfloat        *comp,
+                                             gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] + layer[c] - 0.5f;
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_hard_mix (GeglOperation *operation,
+                                          const gfloat  *in,
+                                          const gfloat  *layer,
+                                          gfloat        *comp,
+                                          gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] + layer[c] < 1.0f ? 0.0f : 1.0f;
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_hardlight (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat val;
+
+              if (layer[c] > 0.5f)
+                {
+                  val = (1.0f - in[c]) * (1.0f - (layer[c] - 0.5f) * 2.0f);
+                  val = MIN (1.0f - val, 1.0f);
+                }
+              else
+                {
+                  val = in[c] * (layer[c] * 2.0f);
+                  val = MIN (val, 1.0f);
+                }
+
+              comp[c] = val;
+            }
+        }
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_hsl_color (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat dest_min, dest_max, dest_l;
+          gfloat src_min,  src_max,  src_l;
+
+          dest_min = MIN (in[0],  in[1]);
+          dest_min = MIN (dest_min, in[2]);
+          dest_max = MAX (in[0],  in[1]);
+          dest_max = MAX (dest_max, in[2]);
+          dest_l   = (dest_min + dest_max) / 2.0f;
+
+          src_min  = MIN (layer[0],  layer[1]);
+          src_min  = MIN (src_min, layer[2]);
+          src_max  = MAX (layer[0],  layer[1]);
+          src_max  = MAX (src_max, layer[2]);
+          src_l    = (src_min + src_max) / 2.0f;
+
+          if (fabs (src_l) > EPSILON && fabs (1.0 - src_l) > EPSILON)
+            {
+              gboolean dest_high;
+              gboolean src_high;
+              gfloat   ratio;
+              gfloat   offset;
+              gint     c;
+
+              dest_high = dest_l > 0.5f;
+              src_high  = src_l  > 0.5f;
+
+              dest_l = MIN (dest_l, 1.0f - dest_l);
+              src_l  = MIN (src_l,  1.0f - src_l);
+
+              ratio                  = dest_l / src_l;
+
+              offset                 = 0.0f;
+              if (dest_high) offset += 1.0f - 2.0f * dest_l;
+              if (src_high)  offset += 2.0f * dest_l - ratio;
+
+              for (c = 0; c < 3; c++)
+                comp[c] = layer[c] * ratio + offset;
+            }
+          else
+            {
+              comp[RED]   = dest_l;
+              comp[GREEN] = dest_l;
+              comp[BLUE]  = dest_l;
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_hsv_hue (GeglOperation *operation,
+                                         const gfloat  *in,
+                                         const gfloat  *layer,
+                                         gfloat        *comp,
+                                         gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat src_min,  src_max,  src_delta;
+          gfloat dest_min, dest_max, dest_delta, dest_s;
+
+          src_min   = MIN (layer[0], layer[1]);
+          src_min   = MIN (src_min, layer[2]);
+          src_max   = MAX (layer[0], layer[1]);
+          src_max   = MAX (src_max, layer[2]);
+          src_delta = src_max - src_min;
+
+          if (src_delta > EPSILON)
+            {
+              gfloat ratio;
+              gfloat offset;
+              gint   c;
+
+              dest_min   = MIN (in[0], in[1]);
+              dest_min   = MIN (dest_min, in[2]);
+              dest_max   = MAX (in[0], in[1]);
+              dest_max   = MAX (dest_max, in[2]);
+              dest_delta = dest_max - dest_min;
+              dest_s     = dest_max ? dest_delta / dest_max : 0.0f;
+
+              ratio  = dest_s * dest_max / src_delta;
+              offset = dest_max - src_max * ratio;
+
+              for (c = 0; c < 3; c++)
+                comp[c] = layer[c] * ratio + offset;
+            }
+          else
+            {
+              gint c;
+
+              for (c = 0; c < 3; c++)
+                comp[c] = in[c];
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_hsv_saturation (GeglOperation *operation,
+                                                const gfloat  *in,
+                                                const gfloat  *layer,
+                                                gfloat        *comp,
+                                                gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat src_min,  src_max,  src_delta, src_s;
+          gfloat dest_min, dest_max, dest_delta;
+
+          dest_min   = MIN (in[0], in[1]);
+          dest_min   = MIN (dest_min, in[2]);
+          dest_max   = MAX (in[0], in[1]);
+          dest_max   = MAX (dest_max, in[2]);
+          dest_delta = dest_max - dest_min;
+
+          if (dest_delta > EPSILON)
+            {
+              gfloat ratio;
+              gfloat offset;
+              gint   c;
+
+              src_min   = MIN (layer[0], layer[1]);
+              src_min   = MIN (src_min, layer[2]);
+              src_max   = MAX (layer[0], layer[1]);
+              src_max   = MAX (src_max, layer[2]);
+              src_delta = src_max - src_min;
+              src_s     = src_max ? src_delta / src_max : 0.0f;
+
+              ratio  = src_s * dest_max / dest_delta;
+              offset = (1.0f - ratio) * dest_max;
+
+              for (c = 0; c < 3; c++)
+                comp[c] = in[c] * ratio + offset;
+            }
+          else
+            {
+              comp[RED]   = dest_max;
+              comp[GREEN] = dest_max;
+              comp[BLUE]  = dest_max;
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_hsv_value (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat dest_v;
+          gfloat src_v;
+
+          dest_v = MAX (in[0], in[1]);
+          dest_v = MAX (dest_v, in[2]);
+
+          src_v  = MAX (layer[0], layer[1]);
+          src_v  = MAX (src_v, layer[2]);
+
+          if (fabs (dest_v) > EPSILON)
+            {
+              gfloat ratio = src_v / dest_v;
+              gint   c;
+
+              for (c = 0; c < 3; c++)
+                comp[c] = in[c] * ratio;
+            }
+          else
+            {
+              comp[RED]   = src_v;
+              comp[GREEN] = src_v;
+              comp[BLUE]  = src_v;
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_lch_chroma (GeglOperation *operation,
+                                            const gfloat  *in,
+                                            const gfloat  *layer,
+                                            gfloat        *comp,
+                                            gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat A1 = in[1];
+          gfloat B1 = in[2];
+          gfloat c1 = hypotf (A1, B1);
+
+          if (c1 > EPSILON)
+            {
+              gfloat A2 = layer[1];
+              gfloat B2 = layer[2];
+              gfloat c2 = hypotf (A2, B2);
+              gfloat A  = c2 * A1 / c1;
+              gfloat B  = c2 * B1 / c1;
+
+              comp[0] = in[0];
+              comp[1] = A;
+              comp[2] = B;
+            }
+          else
+            {
+              comp[0] = in[0];
+              comp[1] = in[1];
+              comp[2] = in[2];
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_lch_color (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          comp[0] = in[0];
+          comp[1] = layer[1];
+          comp[2] = layer[2];
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+  }
+}
+
+void
+gimp_operation_layer_mode_blend_lch_hue (GeglOperation *operation,
+                                         const gfloat  *in,
+                                         const gfloat  *layer,
+                                         gfloat        *comp,
+                                         gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat A2 = layer[1];
+          gfloat B2 = layer[2];
+          gfloat c2 = hypotf (A2, B2);
+
+          if (c2 > EPSILON)
+            {
+              gfloat A1 = in[1];
+              gfloat B1 = in[2];
+              gfloat c1 = hypotf (A1, B1);
+              gfloat A  = c1 * A2 / c2;
+              gfloat B  = c1 * B2 / c2;
+
+              comp[0] = in[0];
+              comp[1] = A;
+              comp[2] = B;
+            }
+          else
+            {
+              comp[0] = in[0];
+              comp[1] = in[1];
+              comp[2] = in[2];
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_lch_lightness (GeglOperation *operation,
+                                               const gfloat  *in,
+                                               const gfloat  *layer,
+                                               gfloat        *comp,
+                                               gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          comp[0] = layer[0];
+          comp[1] = in[1];
+          comp[2] = in[2];
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_lighten_only (GeglOperation *operation,
+                                              const gfloat  *in,
+                                              const gfloat  *layer,
+                                              gfloat        *comp,
+                                              gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = MAX (in[c], layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_linear_burn (GeglOperation *operation,
+                                             const gfloat  *in,
+                                             const gfloat  *layer,
+                                             gfloat        *comp,
+                                             gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] + layer[c] - 1.0f;
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+/* added according to:
+    http://www.deepskycolors.com/archivo/2010/04/21/formulas-for-Photoshop-blending-modes.html */
+void
+gimp_operation_layer_mode_blend_linear_light (GeglOperation *operation,
+                                              const gfloat  *in,
+                                              const gfloat  *layer,
+                                              gfloat        *comp,
+                                              gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat val;
+
+              if (layer[c] <= 0.5f)
+                val = in[c] + 2.0f * layer[c] - 1.0f;
+              else
+                val = in[c] + 2.0f * (layer[c] - 0.5f);
+
+              comp[c] = val;
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_luma_darken_only (GeglOperation *operation,
+                                                  const gfloat  *in,
+                                                  const gfloat  *layer,
+                                                  gfloat        *comp,
+                                                  gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat dest_luminance;
+          gfloat src_luminance;
+          gint   c;
+
+          dest_luminance = GIMP_RGB_LUMINANCE (in[0],    in[1],    in[2]);
+          src_luminance  = GIMP_RGB_LUMINANCE (layer[0], layer[1], layer[2]);
+
+          if (dest_luminance <= src_luminance)
+            {
+              for (c = 0; c < 3; c++)
+                comp[c] = in[c];
+            }
+          else
+            {
+              for (c = 0; c < 3; c++)
+                comp[c] = layer[c];
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_luma_lighten_only (GeglOperation *operation,
+                                                   const gfloat  *in,
+                                                   const gfloat  *layer,
+                                                   gfloat        *comp,
+                                                   gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gfloat dest_luminance;
+          gfloat src_luminance;
+          gint   c;
+
+          dest_luminance = GIMP_RGB_LUMINANCE (in[0],    in[1],    in[2]);
+          src_luminance  = GIMP_RGB_LUMINANCE (layer[0], layer[1], layer[2]);
+
+          if (dest_luminance >= src_luminance)
+            {
+              for (c = 0; c < 3; c++)
+                comp[c] = in[c];
+            }
+          else
+            {
+              for (c = 0; c < 3; c++)
+                comp[c] = layer[c];
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_luminance (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  static const Babl *fish;
+  gfloat            *scratch;
+  gfloat            *in_Y;
+  gfloat            *layer_Y;
+
+  if (! fish)
+    fish = babl_fish ("RGBA float", "Y float");
+
+  scratch = gegl_scratch_new (gfloat, 2 * samples);
+
+  in_Y    = scratch;
+  layer_Y = scratch + samples;
+
+  babl_process (fish, in,    in_Y,    samples);
+  babl_process (fish, layer, layer_Y, samples);
+
+  while (samples--)
+    {
+      if (layer[ALPHA] != 0.0f && in[ALPHA] != 0.0f)
+        {
+          gfloat ratio = safe_div (layer_Y[0], in_Y[0]);
+          gint   c;
+
+          for (c = 0; c < 3; c ++)
+            comp[c] = in[c] * ratio;
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp    += 4;
+      in      += 4;
+      layer   += 4;
+      in_Y    ++;
+      layer_Y ++;
+    }
+
+  gegl_scratch_free (scratch);
+}
+
+void
+gimp_operation_layer_mode_blend_multiply (GeglOperation *operation,
+                                          const gfloat  *in,
+                                          const gfloat  *layer,
+                                          gfloat        *comp,
+                                          gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] * layer[c];
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_overlay (GeglOperation *operation,
+                                         const gfloat  *in,
+                                         const gfloat  *layer,
+                                         gfloat        *comp,
+                                         gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat val;
+
+              if (in[c] < 0.5f)
+                val = 2.0f * in[c] * layer[c];
+              else
+                val = 1.0f - 2.0f * (1.0f - layer[c]) * (1.0f - in[c]);
+
+              comp[c] = val;
+            }
+        }
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+/* added according to:
+    http://www.deepskycolors.com/archivo/2010/04/21/formulas-for-Photoshop-blending-modes.html */
+void
+gimp_operation_layer_mode_blend_pin_light (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat val;
+
+              if (layer[c] > 0.5f)
+                val = MAX(in[c], 2.0f * (layer[c] - 0.5f));
+              else
+                val = MIN(in[c], 2.0f * layer[c]);
+
+              comp[c] = val;
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_screen (GeglOperation *operation,
+                                        const gfloat  *in,
+                                        const gfloat  *layer,
+                                        gfloat        *comp,
+                                        gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = 1.0f - (1.0f - in[c])   * (1.0f - layer[c]);
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_softlight (GeglOperation *operation,
+                                           const gfloat  *in,
+                                           const gfloat  *layer,
+                                           gfloat        *comp,
+                                           gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat multiply = in[c] * layer[c];
+              gfloat screen   = 1.0f - (1.0f - in[c]) * (1.0f - layer[c]);
+              gfloat val      = (1.0f - in[c]) * multiply + in[c] * screen;
+
+              comp[c] = val;
+            }
+        }
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+void
+gimp_operation_layer_mode_blend_subtract (GeglOperation *operation,
+                                          const gfloat  *in,
+                                          const gfloat  *layer,
+                                          gfloat        *comp,
+                                          gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            comp[c] = in[c] - layer[c];
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+/* added according to:
+    http://www.simplefilter.de/en/basics/mixmods.html */
+void
+gimp_operation_layer_mode_blend_vivid_light (GeglOperation *operation,
+                                             const gfloat  *in,
+                                             const gfloat  *layer,
+                                             gfloat        *comp,
+                                             gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          gint c;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat val;
+
+              if (layer[c] <= 0.5f)
+                {
+                  val = 1.0f - safe_div (1.0f - in[c], 2.0f * layer[c]);
+                  val = MAX (val, 0.0f);
+                }
+              else
+                {
+                  val = safe_div (in[c], 2.0f * (1.0f - layer[c]));
+                  val = MIN (val, 1.0f);
+                }
+
+              comp[c] = val;
+            }
+        }
+
+      comp[ALPHA] = layer[ALPHA];
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
+
+
+/*  subtractive blending functions.  these functions must set comp[ALPHA] to
+ *  the modified alpha of the overlapping content, as a fraction of the
+ *  original overlapping content (i.e., an alpha of 1.0 specifies that no
+ *  content is subtracted.)  when in[ALPHA] or layer[ALPHA] are zero, the value
+ *  of comp[RED..BLUE] is unconstrained (in particular, it may be NaN).
+ */
+
+
+void
+gimp_operation_layer_mode_blend_color_erase (GeglOperation *operation,
+                                             const gfloat  *in,
+                                             const gfloat  *layer,
+                                             gfloat        *comp,
+                                             gint           samples)
+{
+  while (samples--)
+    {
+      if (in[ALPHA] != 0.0f && layer[ALPHA] != 0.0f)
+        {
+          const gfloat *color   = in;
+          const gfloat *bgcolor = layer;
+          gfloat       alpha;
+          gint         c;
+
+          alpha = 0.0f;
+
+          for (c = 0; c < 3; c++)
+            {
+              gfloat col   = CLAMP (color[c],   0.0f, 1.0f);
+              gfloat bgcol = CLAMP (bgcolor[c], 0.0f, 1.0f);
+
+              if (fabs (col - bgcol) > EPSILON)
+                {
+                  gfloat a;
+
+                  if (col > bgcol)
+                    a = (col - bgcol) / (1.0f - bgcol);
+                  else
+                    a = (bgcol - col) / bgcol;
+
+                  alpha = MAX (alpha, a);
+                }
+            }
+
+          if (alpha > EPSILON)
+            {
+              gfloat alpha_inv = 1.0f / alpha;
+
+              for (c = 0; c < 3; c++)
+                comp[c] = (color[c] - bgcolor[c]) * alpha_inv + bgcolor[c];
+            }
+          else
+            {
+              comp[RED] = comp[GREEN] = comp[BLUE] = 0.0f;
+            }
+
+          comp[ALPHA] = alpha;
+        }
+      else
+        comp[ALPHA] = 0.0f;
+
+      comp  += 4;
+      layer += 4;
+      in    += 4;
+    }
+}
diff --git a/app/operations/layer-modes/gimpoperationlayermode-blend.h b/app/operations/layer-modes/gimpoperationlayermode-blend.h
new file mode 100644
index 0000000..3a8f995
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode-blend.h
@@ -0,0 +1,200 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-blend.h
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *               2017 Øyvind Kolås <pippin@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; withcomp even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_LAYER_MODE_BLEND_H__
+#define __GIMP_OPERATION_LAYER_MODE_BLEND_H__
+
+
+/*  nonsubtractive blend functions  */
+
+void gimp_operation_layer_mode_blend_addition          (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_burn              (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_darken_only       (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_difference        (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_divide            (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_dodge             (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_exclusion         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_grain_extract     (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_grain_merge       (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_hard_mix          (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_hardlight         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_hsl_color         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_hsv_hue           (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_hsv_saturation    (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_hsv_value         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_lch_chroma        (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_lch_color         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_lch_hue           (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_lch_lightness     (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_lighten_only      (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_linear_burn       (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_linear_light      (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_luma_darken_only  (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_luma_lighten_only (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_luminance         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_multiply          (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_overlay           (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_pin_light         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_screen            (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_softlight         (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_subtract          (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+void gimp_operation_layer_mode_blend_vivid_light       (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+
+
+/*  subtractive blend functions  */
+
+void gimp_operation_layer_mode_blend_color_erase       (GeglOperation *operation,
+                                                        const gfloat  *in,
+                                                        const gfloat  *layer,
+                                                        gfloat        *comp,
+                                                        gint           samples);
+
+
+#endif /* __GIMP_OPERATION_LAYER_MODE_BLEND_H__ */
diff --git a/app/operations/layer-modes/gimpoperationlayermode-composite-sse2.c b/app/operations/layer-modes/gimpoperationlayermode-composite-sse2.c
new file mode 100644
index 0000000..2630751
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode-composite-sse2.c
@@ -0,0 +1,105 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-composite-sse2.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *               2017 Øyvind Kolås <pippin@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationlayermode-composite.h"
+
+
+#if COMPILE_SSE2_INTRINISICS
+
+/* SSE2 */
+#include <emmintrin.h>
+
+
+/*  non-subtractive compositing functions.  these functions expect comp[ALPHA]
+ *  to be the same as layer[ALPHA].  when in[ALPHA] or layer[ALPHA] are zero,
+ *  the value of comp[RED..BLUE] is unconstrained (in particular, it may be
+ *  NaN).
+ */
+
+
+void
+gimp_operation_layer_mode_composite_clip_to_backdrop_sse2 (const gfloat *in,
+                                                           const gfloat *layer,
+                                                           const gfloat *comp,
+                                                           const gfloat *mask,
+                                                           gfloat        opacity,
+                                                           gfloat       *out,
+                                                           gint          samples)
+{
+  if ((((uintptr_t)in)   | /* alignment check */
+       ((uintptr_t)comp) |
+       ((uintptr_t)out)   ) & 0x0F)
+    {
+      gimp_operation_layer_mode_composite_clip_to_backdrop (in, layer, comp,
+                                                            mask, opacity, out,
+                                                            samples);
+    }
+  else
+    {
+      const __v4sf *v_in      = (const __v4sf*) in;
+      const __v4sf *v_comp    = (const __v4sf*) comp;
+            __v4sf *v_out     = (__v4sf*) out;
+      const __v4sf  v_one     =  _mm_set1_ps (1.0f);
+      const __v4sf  v_opacity =  _mm_set1_ps (opacity);
+
+      while (samples--)
+        {
+          __v4sf alpha, rgba_in, rgba_comp;
+
+          rgba_in   = *v_in ++;
+          rgba_comp = *v_comp++;
+
+          alpha = (__v4sf)_mm_shuffle_epi32((__m128i)rgba_comp,_MM_SHUFFLE(3,3,3,3)) * v_opacity;
+
+          if (mask)
+            {
+              alpha = alpha * _mm_set1_ps (*mask++);
+            }
+
+          if (rgba_in[ALPHA] != 0.0f && _mm_ucomineq_ss (alpha, _mm_setzero_ps ()))
+            {
+              __v4sf out_pixel, out_pixel_rbaa, out_alpha;
+
+              out_alpha      = (__v4sf)_mm_shuffle_epi32((__m128i)rgba_in,_MM_SHUFFLE(3,3,3,3));
+              out_pixel      = rgba_comp * alpha + rgba_in * (v_one - alpha);
+              out_pixel_rbaa = _mm_shuffle_ps (out_pixel, out_alpha, _MM_SHUFFLE (3, 3, 2, 0));
+              out_pixel      = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+              *v_out++ = out_pixel;
+            }
+          else
+            {
+              *v_out ++ = rgba_in;
+            }
+        }
+    }
+}
+
+#endif /* COMPILE_SSE2_INTRINISICS */
diff --git a/app/operations/layer-modes/gimpoperationlayermode-composite.c b/app/operations/layer-modes/gimpoperationlayermode-composite.c
new file mode 100644
index 0000000..4275818
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode-composite.c
@@ -0,0 +1,434 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-composite.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *               2017 Øyvind Kolås <pippin@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationlayermode-composite.h"
+
+
+/*  non-subtractive compositing functions.  these functions expect comp[ALPHA]
+ *  to be the same as layer[ALPHA].  when in[ALPHA] or layer[ALPHA] are zero,
+ *  the value of comp[RED..BLUE] is unconstrained (in particular, it may be
+ *  NaN).
+ */
+
+
+void
+gimp_operation_layer_mode_composite_union (const gfloat *in,
+                                           const gfloat *layer,
+                                           const gfloat *comp,
+                                           const gfloat *mask,
+                                           gfloat        opacity,
+                                           gfloat       *out,
+                                           gint          samples)
+{
+  while (samples--)
+    {
+      gfloat new_alpha;
+      gfloat in_alpha    = in[ALPHA];
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      new_alpha = layer_alpha + (1.0f - layer_alpha) * in_alpha;
+
+      if (layer_alpha == 0.0f || new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in_alpha == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gfloat ratio = layer_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = ratio * (in_alpha * (comp[b] - layer[b]) + layer[b] - in[b]) + in[b];
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_backdrop (const gfloat *in,
+                                                      const gfloat *layer,
+                                                      const gfloat *comp,
+                                                      const gfloat *mask,
+                                                      gfloat        opacity,
+                                                      gfloat       *out,
+                                                      gint          samples)
+{
+  while (samples--)
+    {
+      gfloat layer_alpha = comp[ALPHA] * opacity;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      if (in[ALPHA] == 0.0f || layer_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * layer_alpha + in[b] * (1.0f - layer_alpha);
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in   += 4;
+      comp += 4;
+      out  += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_layer (const gfloat *in,
+                                                   const gfloat *layer,
+                                                   const gfloat *comp,
+                                                   const gfloat *mask,
+                                                   gfloat        opacity,
+                                                   gfloat       *out,
+                                                   gint          samples)
+{
+  while (samples--)
+    {
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      if (layer_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in[ALPHA] == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * in[ALPHA] + layer[b] * (1.0f - in[ALPHA]);
+        }
+
+      out[ALPHA] = layer_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_intersection (const gfloat *in,
+                                                  const gfloat *layer,
+                                                  const gfloat *comp,
+                                                  const gfloat *mask,
+                                                  gfloat        opacity,
+                                                  gfloat       *out,
+                                                  gint          samples)
+{
+  while (samples--)
+    {
+      gfloat new_alpha = in[ALPHA] * comp[ALPHA] * opacity;
+
+      if (mask)
+        new_alpha *= *mask;
+
+      if (new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          out[RED]   = comp[RED];
+          out[GREEN] = comp[GREEN];
+          out[BLUE]  = comp[BLUE];
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in   += 4;
+      comp += 4;
+      out  += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+/*  subtractive compositing functions.  these functions expect comp[ALPHA] to
+ *  specify the modified alpha of the overlapping content, as a fraction of the
+ *  original overlapping content (i.e., an alpha of 1.0 specifies that no
+ *  content is subtracted.)  when in[ALPHA] or layer[ALPHA] are zero, the value
+ *  of comp[RED..BLUE] is unconstrained (in particular, it may be NaN).
+ */
+
+void
+gimp_operation_layer_mode_composite_union_sub (const gfloat *in,
+                                               const gfloat *layer,
+                                               const gfloat *comp,
+                                               const gfloat *mask,
+                                               gfloat        opacity,
+                                               gfloat       *out,
+                                               gint          samples)
+{
+  while (samples--)
+    {
+      gfloat in_alpha    = in[ALPHA];
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+      gfloat comp_alpha  = comp[ALPHA];
+      gfloat new_alpha;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      new_alpha = in_alpha + layer_alpha -
+                  (2.0f - comp_alpha) * in_alpha * layer_alpha;
+
+      if (layer_alpha == 0.0f || new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in_alpha == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gfloat ratio       = in_alpha / new_alpha;
+          gfloat layer_coeff = 1.0f / in_alpha - 1.0f;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = ratio * (layer_alpha * (comp_alpha * comp[b] + layer_coeff * layer[b] - in[b]) + in[b]);
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_backdrop_sub (const gfloat *in,
+                                                          const gfloat *layer,
+                                                          const gfloat *comp,
+                                                          const gfloat *mask,
+                                                          gfloat        opacity,
+                                                          gfloat       *out,
+                                                          gint          samples)
+{
+  while (samples--)
+    {
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+      gfloat comp_alpha  = comp[ALPHA];
+      gfloat new_alpha;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      comp_alpha *= layer_alpha;
+
+      new_alpha = 1.0f - layer_alpha + comp_alpha;
+
+      if (in[ALPHA] == 0.0f || comp_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * ratio + in[b] * (1.0f - ratio);
+        }
+
+      new_alpha *= in[ALPHA];
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_layer_sub (const gfloat *in,
+                                                       const gfloat *layer,
+                                                       const gfloat *comp,
+                                                       const gfloat *mask,
+                                                       gfloat        opacity,
+                                                       gfloat       *out,
+                                                       gint          samples)
+{
+  while (samples--)
+    {
+      gfloat in_alpha    = in[ALPHA];
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+      gfloat comp_alpha  = comp[ALPHA];
+      gfloat new_alpha;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      comp_alpha *= in_alpha;
+
+      new_alpha = 1.0f - in_alpha + comp_alpha;
+
+      if (layer_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in_alpha == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * ratio + layer[b] * (1.0f - ratio);
+        }
+
+      new_alpha *= layer_alpha;
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_intersection_sub (const gfloat *in,
+                                                      const gfloat *layer,
+                                                      const gfloat *comp,
+                                                      const gfloat *mask,
+                                                      gfloat        opacity,
+                                                      gfloat       *out,
+                                                      gint          samples)
+{
+  while (samples--)
+    {
+      gfloat new_alpha = in[ALPHA] * layer[ALPHA] * comp[ALPHA] * opacity;
+
+      if (mask)
+        new_alpha *= *mask;
+
+      if (new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          out[RED]   = comp[RED];
+          out[GREEN] = comp[GREEN];
+          out[BLUE]  = comp[BLUE];
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
diff --git a/app/operations/layer-modes/gimpoperationlayermode-composite.h b/app/operations/layer-modes/gimpoperationlayermode-composite.h
new file mode 100644
index 0000000..f9ec2a5
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode-composite.h
@@ -0,0 +1,98 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-composite.h
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *               2017 Øyvind Kolås <pippin@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_LAYER_MODE_COMPOSITE_H__
+#define __GIMP_OPERATION_LAYER_MODE_COMPOSITE_H__
+
+
+void gimp_operation_layer_mode_composite_union                 (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+void gimp_operation_layer_mode_composite_clip_to_backdrop      (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+void gimp_operation_layer_mode_composite_clip_to_layer         (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+void gimp_operation_layer_mode_composite_intersection          (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+
+void gimp_operation_layer_mode_composite_union_sub             (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+void gimp_operation_layer_mode_composite_clip_to_backdrop_sub  (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+void gimp_operation_layer_mode_composite_clip_to_layer_sub     (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+void gimp_operation_layer_mode_composite_intersection_sub      (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+
+#if COMPILE_SSE2_INTRINISICS
+
+void gimp_operation_layer_mode_composite_clip_to_backdrop_sse2 (const gfloat        *in,
+                                                                const gfloat        *layer,
+                                                                const gfloat        *comp,
+                                                                const gfloat        *mask,
+                                                                gfloat               opacity,
+                                                                gfloat              *out,
+                                                                gint                 samples);
+
+#endif /* COMPILE_SSE2_INTRINISICS */
+
+
+#endif /* __GIMP_OPERATION_LAYER_MODE_COMPOSITE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationlayermode.c b/app/operations/layer-modes/gimpoperationlayermode.c
new file mode 100644
index 0000000..db74ed5
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode.c
@@ -0,0 +1,914 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ * Copyright (C) 2008 Martin Nordholts <martinn@svn.gnome.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "../operations-types.h"
+
+#include "gimp-layer-modes.h"
+#include "gimpoperationlayermode.h"
+#include "gimpoperationlayermode-composite.h"
+
+
+/* the maximum number of samples to process in one go.  used to limit
+ * the size of the buffers we allocate on the stack.
+ */
+#define GIMP_COMPOSITE_BLEND_MAX_SAMPLES ((1 << 18) /* 256 KiB */  /      \
+                                          16 /* bytes per pixel */ /      \
+                                          2  /* max number of buffers */)
+
+/* number of consecutive unblended samples (whose source or destination alpha
+ * is zero) above which to split the blending process, in order to avoid
+ * performing too many unnecessary conversions.
+ */
+#define GIMP_COMPOSITE_BLEND_SPLIT_THRESHOLD 32
+
+
+enum
+{
+  PROP_0,
+  PROP_LAYER_MODE,
+  PROP_OPACITY,
+  PROP_BLEND_SPACE,
+  PROP_COMPOSITE_SPACE,
+  PROP_COMPOSITE_MODE
+};
+
+
+typedef void (* CompositeFunc) (const gfloat *in,
+                                const gfloat *layer,
+                                const gfloat *comp,
+                                const gfloat *mask,
+                                float         opacity,
+                                gfloat       *out,
+                                gint          samples);
+
+
+static void            gimp_operation_layer_mode_set_property        (GObject                *object,
+                                                                      guint                   property_id,
+                                                                      const GValue           *value,
+                                                                      GParamSpec             *pspec);
+static void            gimp_operation_layer_mode_get_property        (GObject                *object,
+                                                                      guint                   property_id,
+                                                                      GValue                 *value,
+                                                                      GParamSpec             *pspec);
+
+static void            gimp_operation_layer_mode_prepare             (GeglOperation          *operation);
+static GeglRectangle   gimp_operation_layer_mode_get_bounding_box    (GeglOperation          *operation);
+static gboolean        gimp_operation_layer_mode_parent_process      (GeglOperation          *operation,
+                                                                      GeglOperationContext   *context,
+                                                                      const gchar            *output_prop,
+                                                                      const GeglRectangle    *result,
+                                                                      gint                    level);
+
+static gboolean        gimp_operation_layer_mode_process             (GeglOperation          *operation,
+                                                                      void                   *in,
+                                                                      void                   *layer,
+                                                                      void                   *mask,
+                                                                      void                   *out,
+                                                                      glong                   samples,
+                                                                      const GeglRectangle    *roi,
+                                                                      gint                    level);
+
+static gboolean        gimp_operation_layer_mode_real_parent_process (GeglOperation          *operation,
+                                                                      GeglOperationContext   *context,
+                                                                      const gchar            *output_prop,
+                                                                      const GeglRectangle    *result,
+                                                                      gint                    level);
+static gboolean        gimp_operation_layer_mode_real_process        (GeglOperation          *operation,
+                                                                      void                   *in,
+                                                                      void                   *layer,
+                                                                      void                   *mask,
+                                                                      void                   *out,
+                                                                      glong                   samples,
+                                                                      const GeglRectangle    *roi,
+                                                                      gint                    level);
+
+static gboolean        process_last_node                             (GeglOperation       *operation,
+                                                                      void                *in,
+                                                                      void                *layer,
+                                                                      void                *mask,
+                                                                      void                *out,
+                                                                      glong                samples,
+                                                                      const GeglRectangle *roi,
+                                                                      gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationLayerMode, gimp_operation_layer_mode,
+               GEGL_TYPE_OPERATION_POINT_COMPOSER3)
+
+#define parent_class gimp_operation_layer_mode_parent_class
+
+
+static const Babl *gimp_layer_color_space_fish[3 /* from */][3 /* to */];
+
+static CompositeFunc composite_union                = gimp_operation_layer_mode_composite_union;
+static CompositeFunc composite_clip_to_backdrop     = gimp_operation_layer_mode_composite_clip_to_backdrop;
+static CompositeFunc composite_clip_to_layer        = gimp_operation_layer_mode_composite_clip_to_layer;
+static CompositeFunc composite_intersection         = gimp_operation_layer_mode_composite_intersection;
+
+static CompositeFunc composite_union_sub            = gimp_operation_layer_mode_composite_union_sub;
+static CompositeFunc composite_clip_to_backdrop_sub = gimp_operation_layer_mode_composite_clip_to_backdrop_sub;
+static CompositeFunc composite_clip_to_layer_sub    = gimp_operation_layer_mode_composite_clip_to_layer_sub;
+static CompositeFunc composite_intersection_sub     = gimp_operation_layer_mode_composite_intersection_sub;
+
+
+static void
+gimp_operation_layer_mode_class_init (GimpOperationLayerModeClass *klass)
+{
+  GObjectClass                     *object_class          = G_OBJECT_CLASS (klass);
+  GeglOperationClass               *operation_class       = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointComposer3Class *point_composer3_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name", "gimp:layer-mode", NULL);
+
+  object_class->set_property        = gimp_operation_layer_mode_set_property;
+  object_class->get_property        = gimp_operation_layer_mode_get_property;
+
+  operation_class->prepare          = gimp_operation_layer_mode_prepare;
+  operation_class->get_bounding_box = gimp_operation_layer_mode_get_bounding_box;
+  operation_class->process          = gimp_operation_layer_mode_parent_process;
+
+  point_composer3_class->process    = gimp_operation_layer_mode_process;
+
+  klass->parent_process             = gimp_operation_layer_mode_real_parent_process;
+  klass->process                    = gimp_operation_layer_mode_real_process;
+  klass->get_affected_region        = NULL;
+
+  g_object_class_install_property (object_class, PROP_LAYER_MODE,
+                                   g_param_spec_enum ("layer-mode",
+                                                      NULL, NULL,
+                                                      GIMP_TYPE_LAYER_MODE,
+                                                      GIMP_LAYER_MODE_NORMAL,
+                                                      GIMP_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_OPACITY,
+                                   g_param_spec_double ("opacity",
+                                                        NULL, NULL,
+                                                        0.0, 1.0, 1.0,
+                                                        GIMP_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_BLEND_SPACE,
+                                   g_param_spec_enum ("blend-space",
+                                                      NULL, NULL,
+                                                      GIMP_TYPE_LAYER_COLOR_SPACE,
+                                                      GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+                                                      GIMP_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+
+  g_object_class_install_property (object_class, PROP_COMPOSITE_SPACE,
+                                   g_param_spec_enum ("composite-space",
+                                                      NULL, NULL,
+                                                      GIMP_TYPE_LAYER_COLOR_SPACE,
+                                                      GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,
+                                                      GIMP_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_COMPOSITE_MODE,
+                                   g_param_spec_enum ("composite-mode",
+                                                      NULL, NULL,
+                                                      GIMP_TYPE_LAYER_COMPOSITE_MODE,
+                                                      GIMP_LAYER_COMPOSITE_UNION,
+                                                      GIMP_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  gimp_layer_color_space_fish
+    /* from */ [GIMP_LAYER_COLOR_SPACE_RGB_LINEAR     - 1]
+    /* to   */ [GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL - 1] =
+      babl_fish ("RGBA float", "R'G'B'A float");
+  gimp_layer_color_space_fish
+    /* from */ [GIMP_LAYER_COLOR_SPACE_RGB_LINEAR     - 1]
+    /* to   */ [GIMP_LAYER_COLOR_SPACE_LAB            - 1] =
+      babl_fish ("RGBA float", "CIE Lab alpha float");
+
+  gimp_layer_color_space_fish
+    /* from */ [GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL - 1]
+    /* to   */ [GIMP_LAYER_COLOR_SPACE_RGB_LINEAR     - 1] =
+      babl_fish ("R'G'B'A float", "RGBA float");
+  gimp_layer_color_space_fish
+    /* from */ [GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL - 1]
+    /* to   */ [GIMP_LAYER_COLOR_SPACE_LAB            - 1] =
+      babl_fish ("R'G'B'A float", "CIE Lab alpha float");
+
+  gimp_layer_color_space_fish
+    /* from */ [GIMP_LAYER_COLOR_SPACE_LAB            - 1]
+    /* to   */ [GIMP_LAYER_COLOR_SPACE_RGB_LINEAR     - 1] =
+      babl_fish ("CIE Lab alpha float", "RGBA float");
+  gimp_layer_color_space_fish
+    /* from */ [GIMP_LAYER_COLOR_SPACE_LAB            - 1]
+    /* to   */ [GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL - 1] =
+      babl_fish ("CIE Lab alpha float", "R'G'B'A float");
+
+#if COMPILE_SSE2_INTRINISICS
+  if (gimp_cpu_accel_get_support () & GIMP_CPU_ACCEL_X86_SSE2)
+    composite_clip_to_backdrop = gimp_operation_layer_mode_composite_clip_to_backdrop_sse2;
+#endif
+}
+
+static void
+gimp_operation_layer_mode_init (GimpOperationLayerMode *self)
+{
+}
+
+static void
+gimp_operation_layer_mode_set_property (GObject      *object,
+                                        guint         property_id,
+                                        const GValue *value,
+                                        GParamSpec   *pspec)
+{
+  GimpOperationLayerMode *self = GIMP_OPERATION_LAYER_MODE (object);
+
+  switch (property_id)
+    {
+    case PROP_LAYER_MODE:
+      self->layer_mode = g_value_get_enum (value);
+      break;
+
+    case PROP_OPACITY:
+      self->prop_opacity = g_value_get_double (value);
+      break;
+
+    case PROP_BLEND_SPACE:
+      self->blend_space = g_value_get_enum (value);
+      break;
+
+    case PROP_COMPOSITE_SPACE:
+      self->composite_space = g_value_get_enum (value);
+      break;
+
+    case PROP_COMPOSITE_MODE:
+      self->prop_composite_mode = g_value_get_enum (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_layer_mode_get_property (GObject    *object,
+                                        guint       property_id,
+                                        GValue     *value,
+                                        GParamSpec *pspec)
+{
+  GimpOperationLayerMode *self = GIMP_OPERATION_LAYER_MODE (object);
+
+  switch (property_id)
+    {
+    case PROP_LAYER_MODE:
+      g_value_set_enum (value, self->layer_mode);
+      break;
+
+    case PROP_OPACITY:
+      g_value_set_double (value, self->prop_opacity);
+      break;
+
+    case PROP_BLEND_SPACE:
+      g_value_set_enum (value, self->blend_space);
+      break;
+
+    case PROP_COMPOSITE_SPACE:
+      g_value_set_enum (value, self->composite_space);
+      break;
+
+    case PROP_COMPOSITE_MODE:
+      g_value_set_enum (value, self->prop_composite_mode);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_layer_mode_prepare (GeglOperation *operation)
+{
+  GimpOperationLayerMode *self = GIMP_OPERATION_LAYER_MODE (operation);
+  const GeglRectangle    *input_extent;
+  const GeglRectangle    *mask_extent;
+  const Babl             *preferred_format;
+  const Babl             *format;
+
+  self->composite_mode = self->prop_composite_mode;
+
+  if (self->composite_mode == GIMP_LAYER_COMPOSITE_AUTO)
+    {
+      self->composite_mode =
+        gimp_layer_mode_get_composite_mode (self->layer_mode);
+
+      g_warn_if_fail (self->composite_mode != GIMP_LAYER_COMPOSITE_AUTO);
+    }
+
+  self->function       = gimp_layer_mode_get_function       (self->layer_mode);
+  self->blend_function = gimp_layer_mode_get_blend_function (self->layer_mode);
+
+  input_extent = gegl_operation_source_get_bounding_box (operation, "input");
+  mask_extent  = gegl_operation_source_get_bounding_box (operation, "aux2");
+
+  /* if the input pad has data, work as usual. */
+  if (input_extent && ! gegl_rectangle_is_empty (input_extent))
+    {
+      self->is_last_node = FALSE;
+
+      preferred_format = gegl_operation_get_source_format (operation, "input");
+    }
+  /* otherwise, we're the last node (corresponding to the bottom layer).
+   * in this case, we render the layer (as if) using UNION mode.
+   */
+  else
+    {
+      self->is_last_node = TRUE;
+
+      /* if the layer mode doesn't affect the source, use a shortcut
+       * function that only applies the opacity/mask to the layer.
+       */
+      if (! (gimp_operation_layer_mode_get_affected_region (self) &
+             GIMP_LAYER_COMPOSITE_REGION_SOURCE))
+        {
+          self->function = process_last_node;
+        }
+      /* otherwise, use the original process function, but force the
+       * composite mode to UNION.
+       */
+      else
+        {
+          self->composite_mode = GIMP_LAYER_COMPOSITE_UNION;
+        }
+
+      preferred_format = gegl_operation_get_source_format (operation, "aux");
+    }
+
+  self->has_mask = mask_extent && ! gegl_rectangle_is_empty (mask_extent);
+
+  format = gimp_layer_mode_get_format (self->layer_mode,
+                                       self->blend_space,
+                                       self->composite_space,
+                                       self->composite_mode,
+                                       preferred_format);
+
+  gegl_operation_set_format (operation, "input",  format);
+  gegl_operation_set_format (operation, "output", format);
+  gegl_operation_set_format (operation, "aux",    format);
+  gegl_operation_set_format (operation, "aux2",   babl_format ("Y float"));
+}
+
+static GeglRectangle
+gimp_operation_layer_mode_get_bounding_box (GeglOperation *op)
+{
+  GimpOperationLayerMode   *self     = (gpointer) op;
+  GeglRectangle            *in_rect;
+  GeglRectangle            *aux_rect;
+  GeglRectangle            *aux2_rect;
+  GeglRectangle             src_rect = {};
+  GeglRectangle             dst_rect = {};
+  GeglRectangle             result;
+  GimpLayerCompositeRegion  included_region;
+
+  in_rect   = gegl_operation_source_get_bounding_box (op, "input");
+  aux_rect  = gegl_operation_source_get_bounding_box (op, "aux");
+  aux2_rect = gegl_operation_source_get_bounding_box (op, "aux2");
+
+  if (in_rect)
+    dst_rect = *in_rect;
+
+  if (aux_rect)
+    {
+      src_rect = *aux_rect;
+
+      if (aux2_rect)
+        gegl_rectangle_intersect (&src_rect, &src_rect, aux2_rect);
+    }
+
+  if (self->is_last_node)
+    {
+      included_region = GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+    }
+  else
+    {
+      included_region = gimp_layer_mode_get_included_region (self->layer_mode,
+                                                             self->composite_mode);
+    }
+
+  if (self->prop_opacity == 0.0)
+    included_region &= ~GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+
+  gegl_rectangle_intersect (&result, &src_rect, &dst_rect);
+
+  if (included_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE)
+    gegl_rectangle_bounding_box (&result, &result, &src_rect);
+
+  if (included_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION)
+    gegl_rectangle_bounding_box (&result, &result, &dst_rect);
+
+  return result;
+}
+
+static gboolean
+gimp_operation_layer_mode_parent_process (GeglOperation        *operation,
+                                          GeglOperationContext *context,
+                                          const gchar          *output_prop,
+                                          const GeglRectangle  *result,
+                                          gint                  level)
+{
+  GimpOperationLayerMode *point = GIMP_OPERATION_LAYER_MODE (operation);
+
+  point->opacity = point->prop_opacity;
+
+  /* if we have a mask, but it's not included in the output, pretend the
+   * opacity is 0, so that we don't composite 'aux' over 'input' as if there
+   * was no mask.
+   */
+  if (point->has_mask)
+    {
+      GObject  *mask;
+      gboolean  has_mask;
+
+      /* get the raw value.  this does not increase the reference count. */
+      mask = gegl_operation_context_get_object (context, "aux2");
+
+      /* disregard 'mask' if it's not included in the roi. */
+      has_mask =
+        mask &&
+        gegl_rectangle_intersect (NULL,
+                                  gegl_buffer_get_extent (GEGL_BUFFER (mask)),
+                                  result);
+
+      if (! has_mask)
+        point->opacity = 0.0;
+    }
+
+  return GIMP_OPERATION_LAYER_MODE_GET_CLASS (point)->parent_process (
+    operation, context, output_prop, result, level);
+}
+
+static gboolean
+gimp_operation_layer_mode_process (GeglOperation       *operation,
+                                   void                *in,
+                                   void                *layer,
+                                   void                *mask,
+                                   void                *out,
+                                   glong                samples,
+                                   const GeglRectangle *roi,
+                                   gint                 level)
+{
+  return ((GimpOperationLayerMode *) operation)->function (
+    operation, in, layer, mask, out, samples, roi, level);
+}
+
+static gboolean
+gimp_operation_layer_mode_real_parent_process (GeglOperation        *operation,
+                                               GeglOperationContext *context,
+                                               const gchar          *output_prop,
+                                               const GeglRectangle  *result,
+                                               gint                  level)
+{
+  GimpOperationLayerMode   *point = GIMP_OPERATION_LAYER_MODE (operation);
+  GObject                  *input;
+  GObject                  *aux;
+  gboolean                  has_input;
+  gboolean                  has_aux;
+  GimpLayerCompositeRegion  included_region;
+
+  /* get the raw values.  this does not increase the reference count. */
+  input = gegl_operation_context_get_object (context, "input");
+  aux   = gegl_operation_context_get_object (context, "aux");
+
+  /* disregard 'input' if it's not included in the roi. */
+  has_input =
+    input &&
+    gegl_rectangle_intersect (NULL,
+                              gegl_buffer_get_extent (GEGL_BUFFER (input)),
+                              result);
+
+  /* disregard 'aux' if it's not included in the roi, or if it's fully
+   * transparent.
+   */
+  has_aux =
+    aux &&
+    point->opacity != 0.0 &&
+    gegl_rectangle_intersect (NULL,
+                              gegl_buffer_get_extent (GEGL_BUFFER (aux)),
+                              result);
+
+  if (point->is_last_node)
+    {
+      included_region = GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+    }
+  else
+    {
+      included_region = gimp_layer_mode_get_included_region (point->layer_mode,
+                                                             point->composite_mode);
+    }
+
+  /* if there's no 'input' ... */
+  if (! has_input)
+    {
+      /* ... and there's 'aux', and the composite mode includes it (or we're
+       * the last node) ...
+       */
+      if (has_aux && (included_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE))
+        {
+          GimpLayerCompositeRegion affected_region;
+
+          affected_region =
+            gimp_operation_layer_mode_get_affected_region (point);
+
+          /* ... and the op doesn't otherwise affect 'aux', or changes its
+           * alpha ...
+           */
+          if (! (affected_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE) &&
+              point->opacity == 1.0                                    &&
+              ! gegl_operation_context_get_object (context, "aux2"))
+            {
+              /* pass 'aux' directly as output; */
+              gegl_operation_context_set_object (context, "output", aux);
+              return TRUE;
+            }
+
+          /* otherwise, if the op affects 'aux', or changes its alpha, process
+           * it even though there's no 'input';
+           */
+        }
+      /* otherwise, there's no 'aux', or the composite mode doesn't include it,
+       * and so ...
+       */
+      else
+        {
+          /* ... the output is empty. */
+          gegl_operation_context_set_object (context, "output", NULL);
+          return TRUE;
+        }
+    }
+  /* otherwise, if there's 'input' but no 'aux' ... */
+  else if (! has_aux)
+    {
+      /* ... and the composite mode includes 'input' ... */
+      if (included_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION)
+        {
+          GimpLayerCompositeRegion affected_region;
+
+          affected_region =
+            gimp_operation_layer_mode_get_affected_region (point);
+
+          /* ... and the op doesn't otherwise affect 'input' ... */
+          if (! (affected_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION))
+            {
+              /* pass 'input' directly as output; */
+              gegl_operation_context_set_object (context, "output", input);
+              return TRUE;
+            }
+
+          /* otherwise, if the op affects 'input', process it even though
+           * there's no 'aux';
+           */
+        }
+
+      /* otherwise, the output is fully transparent, but we process it anyway
+       * to maintain the 'input' color values.
+       */
+    }
+
+  /* FIXME: we don't actually handle the case where one of the inputs
+   * is NULL -- it'll just segfault.  'input' is not expected to be NULL,
+   * but 'aux' might be, currently.
+   */
+  if (! input || ! aux)
+    {
+      GObject *empty = G_OBJECT (gegl_buffer_new (NULL, NULL));
+
+      if (! input) gegl_operation_context_set_object (context, "input", empty);
+      if (! aux)   gegl_operation_context_set_object (context, "aux",   empty);
+
+      if (! input && ! aux)
+        gegl_object_set_has_forked (G_OBJECT (empty));
+
+      g_object_unref (empty);
+    }
+
+  /* chain up, which will create the needed buffers for our actual
+   * process function
+   */
+  return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
+                                                       output_prop, result,
+                                                       level);
+}
+
+static gboolean
+gimp_operation_layer_mode_real_process (GeglOperation       *operation,
+                                        void                *in_p,
+                                        void                *layer_p,
+                                        void                *mask_p,
+                                        void                *out_p,
+                                        glong                samples,
+                                        const GeglRectangle *roi,
+                                        gint                 level)
+{
+  GimpOperationLayerMode *layer_mode              = (gpointer) operation;
+  gfloat                 *in                      = in_p;
+  gfloat                 *out                     = out_p;
+  gfloat                 *layer                   = layer_p;
+  gfloat                 *mask                    = mask_p;
+  gfloat                  opacity                 = layer_mode->opacity;
+  GimpLayerColorSpace     blend_space             = layer_mode->blend_space;
+  GimpLayerColorSpace     composite_space         = layer_mode->composite_space;
+  GimpLayerCompositeMode  composite_mode          = layer_mode->composite_mode;
+  GimpLayerModeBlendFunc  blend_function          = layer_mode->blend_function;
+  gboolean                composite_needs_in_color;
+  gfloat                 *blend_in;
+  gfloat                 *blend_layer;
+  gfloat                 *blend_out;
+  const Babl             *composite_to_blend_fish = NULL;
+  const Babl             *blend_to_composite_fish = NULL;
+
+  /* make sure we don't process more than GIMP_COMPOSITE_BLEND_MAX_SAMPLES
+   * at a time, so that we don't overflow the stack if we allocate buffers
+   * on it.  note that this has to be done with a nested function call,
+   * because alloca'd buffers remain for the duration of the stack frame.
+   */
+  while (samples > GIMP_COMPOSITE_BLEND_MAX_SAMPLES)
+    {
+      gimp_operation_layer_mode_real_process (operation,
+                                              in, layer, mask, out,
+                                              GIMP_COMPOSITE_BLEND_MAX_SAMPLES,
+                                              roi, level);
+
+      in      += 4 * GIMP_COMPOSITE_BLEND_MAX_SAMPLES;
+      layer   += 4 * GIMP_COMPOSITE_BLEND_MAX_SAMPLES;
+      if (mask)
+        mask  +=     GIMP_COMPOSITE_BLEND_MAX_SAMPLES;
+      out     += 4 * GIMP_COMPOSITE_BLEND_MAX_SAMPLES;
+
+      samples -= GIMP_COMPOSITE_BLEND_MAX_SAMPLES;
+    }
+
+  composite_needs_in_color =
+    composite_mode == GIMP_LAYER_COMPOSITE_UNION ||
+    composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP;
+
+  blend_in    = in;
+  blend_layer = layer;
+  blend_out   = out;
+
+  if (blend_space != GIMP_LAYER_COLOR_SPACE_AUTO)
+    {
+      gimp_assert (composite_space >= 1 && composite_space < 4);
+      gimp_assert (blend_space     >= 1 && blend_space     < 4);
+
+      composite_to_blend_fish = gimp_layer_color_space_fish [composite_space - 1]
+                                                            [blend_space     - 1];
+
+      blend_to_composite_fish = gimp_layer_color_space_fish [blend_space     - 1]
+                                                            [composite_space - 1];
+    }
+
+  /* if we need to convert the samples between the composite and blend
+   * spaces...
+   */
+  if (composite_to_blend_fish)
+    {
+      gint i;
+      gint end;
+
+      if (in != out || composite_needs_in_color)
+        {
+          /* don't convert input in-place if we're not doing in-place output,
+           * or if we're going to need the original input for compositing.
+           */
+          blend_in = g_alloca (sizeof (gfloat) * 4 * samples);
+        }
+      blend_layer  = g_alloca (sizeof (gfloat) * 4 * samples);
+
+      if (in == out) /* in-place detected, avoid clobbering since we need to
+                        read 'in' for the compositing stage  */
+        {
+          if (blend_layer != layer)
+            blend_out = blend_layer;
+          else
+            blend_out = g_alloca (sizeof (gfloat) * 4 * samples);
+        }
+
+      /* samples whose the source or destination alpha is zero are not blended,
+       * and therefore do not need to be converted.  while it's generally
+       * desirable to perform conversion and blending in bulk, when we have
+       * more than a certain number of consecutive unblended samples, the cost
+       * of converting them outweighs the cost of splitting the process around
+       * them to avoid the conversion.
+       */
+
+      i   = ALPHA;
+      end = 4 * samples + ALPHA;
+
+      while (TRUE)
+        {
+          gint first;
+          gint last;
+          gint count;
+
+          /* skip any unblended samples.  the color values of `blend_out` for
+           * these samples are unconstrained, in particular, they may be NaN,
+           * but the alpha values should generally be finite, and specifically
+           * 0 when the source alpha is 0.
+           */
+          while (i < end && (in[i] == 0.0f || layer[i] == 0.0f))
+            {
+              blend_out[i] = 0.0f;
+              i += 4;
+            }
+
+          /* stop if there are no more samples */
+          if (i == end)
+            break;
+
+          /* otherwise, keep scanning the samples until we find
+           * GIMP_COMPOSITE_BLEND_SPLIT_THRESHOLD consecutive unblended
+           * samples.
+           */
+
+          first  = i;
+          i     += 4;
+          last   = i;
+
+          while (i < end && i - last < 4 * GIMP_COMPOSITE_BLEND_SPLIT_THRESHOLD)
+            {
+              gboolean blended;
+
+              blended = (in[i] != 0.0f && layer[i] != 0.0f);
+
+              i += 4;
+              if (blended)
+                last = i;
+            }
+
+          /* convert and blend the samples in the range [first, last) */
+
+          count  = (last - first) / 4;
+          first -= ALPHA;
+
+          babl_process (composite_to_blend_fish,
+                        in + first, blend_in + first, count);
+          babl_process (composite_to_blend_fish,
+                        layer + first, blend_layer + first, count);
+
+          blend_function (operation, blend_in + first, blend_layer + first,
+                          blend_out + first, count);
+
+          babl_process (blend_to_composite_fish,
+                        blend_out + first, blend_out + first, count);
+
+          /* make sure the alpha values of `blend_out` are valid for the
+           * trailing unblended samples.
+           */
+          for (; last < i; last += 4)
+            blend_out[last] = 0.0f;
+        }
+    }
+  else
+    {
+      /* if both blending and compositing use the same color space, things are
+       * much simpler.
+       */
+
+      if (in == out) /* in-place detected, avoid clobbering since we need to
+                        read 'in' for the compositing stage  */
+        {
+          blend_out = g_alloca (sizeof (gfloat) * 4 * samples);
+        }
+
+      blend_function (operation, blend_in, blend_layer, blend_out, samples);
+    }
+
+  if (! gimp_layer_mode_is_subtractive (layer_mode->layer_mode))
+    {
+      switch (composite_mode)
+        {
+        case GIMP_LAYER_COMPOSITE_UNION:
+        case GIMP_LAYER_COMPOSITE_AUTO:
+          composite_union (in, layer, blend_out, mask, opacity,
+                           out, samples);
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+          composite_clip_to_backdrop (in, layer, blend_out, mask, opacity,
+                                      out, samples);
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+          composite_clip_to_layer (in, layer, blend_out, mask, opacity,
+                                   out, samples);
+          break;
+
+        case GIMP_LAYER_COMPOSITE_INTERSECTION:
+          composite_intersection (in, layer, blend_out, mask, opacity,
+                                  out, samples);
+          break;
+        }
+    }
+  else
+    {
+      switch (composite_mode)
+        {
+        case GIMP_LAYER_COMPOSITE_UNION:
+        case GIMP_LAYER_COMPOSITE_AUTO:
+          composite_union_sub (in, layer, blend_out, mask, opacity,
+                               out, samples);
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+          composite_clip_to_backdrop_sub (in, layer, blend_out, mask, opacity,
+                                          out, samples);
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+          composite_clip_to_layer_sub (in, layer, blend_out, mask, opacity,
+                                       out, samples);
+          break;
+
+        case GIMP_LAYER_COMPOSITE_INTERSECTION:
+          composite_intersection_sub (in, layer, blend_out, mask, opacity,
+                                      out, samples);
+          break;
+        }
+    }
+
+  return TRUE;
+}
+
+static gboolean
+process_last_node (GeglOperation       *operation,
+                   void                *in_p,
+                   void                *layer_p,
+                   void                *mask_p,
+                   void                *out_p,
+                   glong                samples,
+                   const GeglRectangle *roi,
+                   gint                 level)
+{
+  gfloat *out     = out_p;
+  gfloat *layer   = layer_p;
+  gfloat *mask    = mask_p;
+  gfloat  opacity = GIMP_OPERATION_LAYER_MODE (operation)->opacity;
+
+  while (samples--)
+    {
+      memcpy (out, layer, 3 * sizeof (gfloat));
+
+      out[ALPHA] = layer[ALPHA] * opacity;
+      if (mask)
+        out[ALPHA] *= *mask++;
+
+      layer += 4;
+      out   += 4;
+    }
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+
+GimpLayerCompositeRegion
+gimp_operation_layer_mode_get_affected_region (GimpOperationLayerMode *layer_mode)
+{
+  GimpOperationLayerModeClass *klass;
+
+  g_return_val_if_fail (GIMP_IS_OPERATION_LAYER_MODE (layer_mode),
+                        GIMP_LAYER_COMPOSITE_REGION_INTERSECTION);
+
+  klass = GIMP_OPERATION_LAYER_MODE_GET_CLASS (layer_mode);
+
+  if (klass->get_affected_region)
+    return klass->get_affected_region (layer_mode);
+
+  return GIMP_LAYER_COMPOSITE_REGION_INTERSECTION;
+}
diff --git a/app/operations/layer-modes/gimpoperationlayermode.h b/app/operations/layer-modes/gimpoperationlayermode.h
new file mode 100644
index 0000000..a2a5463
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode.h
@@ -0,0 +1,89 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_LAYER_MODE_H__
+#define __GIMP_OPERATION_LAYER_MODE_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_LAYER_MODE            (gimp_operation_layer_mode_get_type ())
+#define GIMP_OPERATION_LAYER_MODE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_LAYER_MODE, GimpOperationLayerMode))
+#define GIMP_OPERATION_LAYER_MODE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_LAYER_MODE, GimpOperationLayerModeClass))
+#define GIMP_IS_OPERATION_LAYER_MODE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_LAYER_MODE))
+#define GIMP_IS_OPERATION_LAYER_MODE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_LAYER_MODE))
+#define GIMP_OPERATION_LAYER_MODE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_LAYER_MODE, GimpOperationLayerModeClass))
+
+
+typedef struct _GimpOperationLayerModeClass GimpOperationLayerModeClass;
+
+struct _GimpOperationLayerMode
+{
+  GeglOperationPointComposer3  parent_instance;
+
+  GimpLayerMode                layer_mode;
+  gdouble                      opacity;
+  GimpLayerColorSpace          blend_space;
+  GimpLayerColorSpace          composite_space;
+  GimpLayerCompositeMode       composite_mode;
+
+  gdouble                      prop_opacity;
+  GimpLayerCompositeMode       prop_composite_mode;
+
+  GimpLayerModeFunc            function;
+  GimpLayerModeBlendFunc       blend_function;
+  gboolean                     is_last_node;
+  gboolean                     has_mask;
+};
+
+struct _GimpOperationLayerModeClass
+{
+  GeglOperationPointComposer3Class  parent_class;
+
+  /*  virtual functions  */
+  gboolean                 (* parent_process)      (GeglOperation          *operation,
+                                                    GeglOperationContext   *context,
+                                                    const gchar            *output_prop,
+                                                    const GeglRectangle    *result,
+                                                    gint                    level);
+  gboolean                 (* process)             (GeglOperation          *operation,
+                                                    void                   *in,
+                                                    void                   *aux,
+                                                    void                   *mask,
+                                                    void                   *out,
+                                                    glong                   samples,
+                                                    const GeglRectangle    *roi,
+                                                    gint                    level);
+
+  /* Returns the composite region (any combination of the layer and the
+   * backdrop) that the layer mode affects.  Most modes only affect the
+   * overlapping region, and don't need to override this function.
+   */
+  GimpLayerCompositeRegion (* get_affected_region) (GimpOperationLayerMode *layer_mode);
+};
+
+
+GType                    gimp_operation_layer_mode_get_type            (void) G_GNUC_CONST;
+
+GimpLayerCompositeRegion gimp_operation_layer_mode_get_affected_region (GimpOperationLayerMode *layer_mode);
+
+
+#endif /* __GIMP_OPERATION_LAYER_MODE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationmerge.c b/app/operations/layer-modes/gimpoperationmerge.c
new file mode 100644
index 0000000..e1b25ca
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationmerge.c
@@ -0,0 +1,243 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationmerge.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationmerge.h"
+
+
+static gboolean   gimp_operation_merge_process (GeglOperation       *op,
+                                                void                *in,
+                                                void                *layer,
+                                                void                *mask,
+                                                void                *out,
+                                                glong                samples,
+                                                const GeglRectangle *roi,
+                                                gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationMerge, gimp_operation_merge,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_merge_class_init (GimpOperationMergeClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:merge",
+                                 "description", "GIMP merge mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_merge_process;
+}
+
+static void
+gimp_operation_merge_init (GimpOperationMerge *self)
+{
+}
+
+static gboolean
+gimp_operation_merge_process (GeglOperation       *op,
+                              void                *in_p,
+                              void                *layer_p,
+                              void                *mask_p,
+                              void                *out_p,
+                              glong                samples,
+                              const GeglRectangle *roi,
+                              gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat in_alpha    = in[ALPHA];
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          in_alpha = MIN (in_alpha, 1.0f - layer_alpha);
+          new_alpha  = in_alpha + layer_alpha;
+
+          if (new_alpha)
+            {
+              gfloat ratio = layer_alpha / new_alpha;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b] + (layer[b] - in[b]) * ratio;
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      while (samples--)
+        {
+          gfloat in_alpha    = in[ALPHA];
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          layer_alpha -= 1.0f - in_alpha;
+
+          if (layer_alpha > 0.0f)
+            {
+              gfloat ratio = layer_alpha / in_alpha;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b] + (layer[b] - in[b]) * ratio;
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          out[ALPHA] = in_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          if (layer_alpha != 0.0f)
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          out[ALPHA] = layer_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      while (samples--)
+        {
+          gfloat in_alpha    = in[ALPHA];
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          layer_alpha -= 1.0f - in_alpha;
+          layer_alpha = MAX (layer_alpha, 0.0f);
+
+          if (layer_alpha != 0.0f)
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          out[ALPHA] = layer_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationmerge.h b/app/operations/layer-modes/gimpoperationmerge.h
new file mode 100644
index 0000000..01afde1
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationmerge.h
@@ -0,0 +1,54 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationmerge.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_MERGE_H__
+#define __GIMP_OPERATION_MERGE_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_MERGE            (gimp_operation_merge_get_type ())
+#define GIMP_OPERATION_MERGE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_MERGE, GimpOperationMerge))
+#define GIMP_OPERATION_MERGE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_MERGE, GimpOperationMergeClass))
+#define GIMP_IS_OPERATION_MERGE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_MERGE))
+#define GIMP_IS_OPERATION_MERGE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_MERGE))
+#define GIMP_OPERATION_MERGE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_MERGE, GimpOperationMergeClass))
+
+
+typedef struct _GimpOperationMerge      GimpOperationMerge;
+typedef struct _GimpOperationMergeClass GimpOperationMergeClass;
+
+struct _GimpOperationMerge
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationMergeClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_merge_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_MERGE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationnormal-sse2.c b/app/operations/layer-modes/gimpoperationnormal-sse2.c
new file mode 100644
index 0000000..73e42ed
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationnormal-sse2.c
@@ -0,0 +1,264 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationnormal-sse2.c
+ * Copyright (C) 2013 Daniel Sabo
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "operations/operations-types.h"
+
+#include "gimpoperationnormal.h"
+
+
+#if COMPILE_SSE2_INTRINISICS
+
+/* SSE2 */
+#include <emmintrin.h>
+
+
+gboolean
+gimp_operation_normal_process_sse2 (GeglOperation       *op,
+                                    void                *in_p,
+                                    void                *layer_p,
+                                    void                *mask_p,
+                                    void                *out_p,
+                                    glong                samples,
+                                    const GeglRectangle *roi,
+                                    gint                 level)
+{
+  /* check alignment */
+  if ((((uintptr_t)in_p) | ((uintptr_t)layer_p) | ((uintptr_t)out_p)) & 0x0F)
+    {
+      return gimp_operation_normal_process (op,
+                                            in_p, layer_p, mask_p, out_p,
+                                            samples, roi, level);
+    }
+  else
+    {
+      GimpOperationLayerMode *layer_mode      = (gpointer) op;
+      gfloat                  opacity         = layer_mode->opacity;
+      gfloat                 *mask            = mask_p;
+      const                   __v4sf *v_in    = (const __v4sf*) in_p;
+      const                   __v4sf *v_layer = (const __v4sf*) layer_p;
+                              __v4sf *v_out   = (      __v4sf*) out_p;
+
+      const __v4sf one       = _mm_set1_ps (1.0f);
+      const __v4sf v_opacity = _mm_set1_ps (opacity);
+
+      switch (layer_mode->composite_mode)
+        {
+        case GIMP_LAYER_COMPOSITE_UNION:
+        case GIMP_LAYER_COMPOSITE_AUTO:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  __v4sf dst_alpha, a_term, out_pixel, out_alpha, out_pixel_rbaa;
+
+                  /* expand alpha */
+                  dst_alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+                                                         _MM_SHUFFLE (3, 3, 3, 3));
+
+                  /* a_term = dst_a * (1.0 - src_a) */
+                  a_term = dst_alpha * (one - alpha);
+
+                  /* out(color) = src * src_a + dst * a_term */
+                  out_pixel = rgba_layer * alpha + rgba_in * a_term;
+
+                  /* out(alpha) = 1.0 * src_a + 1.0 * a_term */
+                  out_alpha = alpha + a_term;
+
+                  /* un-premultiply */
+                  out_pixel = out_pixel / out_alpha;
+
+                  /* swap in the real alpha */
+                  out_pixel_rbaa = _mm_shuffle_ps (out_pixel, out_alpha, _MM_SHUFFLE (3, 3, 2, 0));
+                  out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+                  *v_out++ = out_pixel;
+                }
+              else
+                {
+                  *v_out++ = rgba_in;
+                }
+            }
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  __v4sf dst_alpha, out_pixel, out_pixel_rbaa;
+
+                  /* expand alpha */
+                  dst_alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+                                                         _MM_SHUFFLE (3, 3, 3, 3));
+
+                  /* out(color) = dst * (1 - src_a) + src * src_a */
+                  out_pixel = rgba_in + (rgba_layer - rgba_in) * alpha;
+
+                  /* swap in the real alpha */
+                  out_pixel_rbaa = _mm_shuffle_ps (out_pixel, dst_alpha, _MM_SHUFFLE (3, 3, 2, 0));
+                  out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+                  *v_out++ = out_pixel;
+                }
+              else
+                {
+                  *v_out++ = rgba_in;
+                }
+            }
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+              __v4sf out_pixel, out_pixel_rbaa;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  /* out(color) = src */
+                  out_pixel = rgba_layer;
+                }
+              else
+                {
+                  out_pixel = rgba_in;
+                }
+
+              /* swap in the real alpha */
+              out_pixel_rbaa = _mm_shuffle_ps (out_pixel, alpha, _MM_SHUFFLE (3, 3, 2, 0));
+              out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+              *v_out++ = out_pixel;
+            }
+          break;
+
+        case GIMP_LAYER_COMPOSITE_INTERSECTION:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+              __v4sf out_pixel, out_pixel_rbaa;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              /* multiply the alpha by in's alpha */
+              alpha *= (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+                                                  _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  /* out(color) = src */
+                  out_pixel = rgba_layer;
+                }
+              else
+                {
+                  out_pixel = rgba_in;
+                }
+
+              /* swap in the real alpha */
+              out_pixel_rbaa = _mm_shuffle_ps (out_pixel, alpha, _MM_SHUFFLE (3, 3, 2, 0));
+              out_pixel = _mm_shuffle_ps (out_pixel, out_pixel_rbaa, _MM_SHUFFLE (2, 1, 1, 0));
+
+              *v_out++ = out_pixel;
+            }
+          break;
+        }
+    }
+
+  return TRUE;
+}
+
+#endif /* COMPILE_SSE2_INTRINISICS */
diff --git a/app/operations/layer-modes/gimpoperationnormal-sse4.c b/app/operations/layer-modes/gimpoperationnormal-sse4.c
new file mode 100644
index 0000000..ba621a2
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationnormal-sse4.c
@@ -0,0 +1,260 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationnormalmode-sse2.c
+ * Copyright (C) 2013 Daniel Sabo
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "operations/operations-types.h"
+
+#include "gimpoperationnormal.h"
+
+
+#if COMPILE_SSE4_1_INTRINISICS
+
+/* SSE4 */
+#include <smmintrin.h>
+
+
+gboolean
+gimp_operation_normal_process_sse4 (GeglOperation       *op,
+                                    void                *in_p,
+                                    void                *layer_p,
+                                    void                *mask_p,
+                                    void                *out_p,
+                                    glong                samples,
+                                    const GeglRectangle *roi,
+                                    gint                 level)
+{
+  /* check alignment */
+  if ((((uintptr_t)in_p) | ((uintptr_t)layer_p) | ((uintptr_t)out_p)) & 0x0F)
+    {
+      return gimp_operation_normal_process (op,
+                                            in_p, layer_p, mask_p, out_p,
+                                            samples, roi, level);
+    }
+  else
+    {
+      GimpOperationLayerMode *layer_mode      = (gpointer) op;
+      gfloat                  opacity         = layer_mode->opacity;
+      gfloat                 *mask            = mask_p;
+      const                   __v4sf *v_in    = (const __v4sf*) in_p;
+      const                   __v4sf *v_layer = (const __v4sf*) layer_p;
+                              __v4sf *v_out   = (      __v4sf*) out_p;
+
+      const __v4sf one       = _mm_set1_ps (1.0f);
+      const __v4sf v_opacity = _mm_set1_ps (opacity);
+
+      switch (layer_mode->composite_mode)
+        {
+        case GIMP_LAYER_COMPOSITE_UNION:
+        case GIMP_LAYER_COMPOSITE_AUTO:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  __v4sf dst_alpha, a_term, out_pixel, out_alpha;
+
+                  /* expand alpha */
+                  dst_alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+                                                         _MM_SHUFFLE (3, 3, 3, 3));
+
+                  /* a_term = dst_a * (1.0 - src_a) */
+                  a_term = dst_alpha * (one - alpha);
+
+                  /* out(color) = src * src_a + dst * a_term */
+                  out_pixel = rgba_layer * alpha + rgba_in * a_term;
+
+                  /* out(alpha) = 1.0 * src_a + 1.0 * a_term */
+                  out_alpha = alpha + a_term;
+
+                  /* un-premultiply */
+                  out_pixel = out_pixel / out_alpha;
+
+                  /* swap in the real alpha */
+                  out_pixel = _mm_blend_ps (out_pixel, out_alpha, 0x08);
+
+                  *v_out++ = out_pixel;
+                }
+              else
+                {
+                  *v_out++ = rgba_in;
+                }
+            }
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  __v4sf dst_alpha, out_pixel;
+
+                  /* expand alpha */
+                  dst_alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+                                                         _MM_SHUFFLE (3, 3, 3, 3));
+
+                  /* out(color) = dst * (1 - src_a) + src * src_a */
+                  out_pixel = rgba_in + (rgba_layer - rgba_in) * alpha;
+
+                  /* swap in the real alpha */
+                  out_pixel = _mm_blend_ps (out_pixel, dst_alpha, 0x08);
+
+                  *v_out++ = out_pixel;
+                }
+              else
+                {
+                  *v_out++ = rgba_in;
+                }
+            }
+          break;
+
+        case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+              __v4sf out_pixel;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  /* out(color) = src */
+                  out_pixel = rgba_layer;
+                }
+              else
+                {
+                  out_pixel = rgba_in;
+                }
+
+              /* swap in the real alpha */
+              out_pixel = _mm_blend_ps (out_pixel, alpha, 0x08);
+
+              *v_out++ = out_pixel;
+            }
+          break;
+
+        case GIMP_LAYER_COMPOSITE_INTERSECTION:
+          while (samples--)
+            {
+              __v4sf rgba_in, rgba_layer, alpha;
+              __v4sf out_pixel;
+
+              rgba_in    = *v_in++;
+              rgba_layer = *v_layer++;
+
+              /* expand alpha */
+              alpha = (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_layer,
+                                                 _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (mask)
+                {
+                  __v4sf mask_alpha;
+
+                  /* multiply layer's alpha by the mask */
+                  mask_alpha = _mm_set1_ps (*mask++);
+                  alpha = alpha * mask_alpha;
+                }
+
+              alpha = alpha * v_opacity;
+
+              /* multiply the alpha by in's alpha */
+              alpha *= (__v4sf)_mm_shuffle_epi32 ((__m128i)rgba_in,
+                                                  _MM_SHUFFLE (3, 3, 3, 3));
+
+              if (_mm_ucomigt_ss (alpha, _mm_setzero_ps ()))
+                {
+                  /* out(color) = src */
+                  out_pixel = rgba_layer;
+                }
+              else
+                {
+                  out_pixel = rgba_in;
+                }
+
+              /* swap in the real alpha */
+              out_pixel = _mm_blend_ps (out_pixel, alpha, 0x08);
+
+              *v_out++ = out_pixel;
+            }
+          break;
+        }
+    }
+
+  return TRUE;
+}
+
+#endif /* COMPILE_SSE4_1_INTRINISICS */
diff --git a/app/operations/layer-modes/gimpoperationnormal.c b/app/operations/layer-modes/gimpoperationnormal.c
new file mode 100644
index 0000000..9bd8705
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationnormal.c
@@ -0,0 +1,266 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationnormalmode.c
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gio/gio.h>
+#include <gegl-plugin.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "../operations-types.h"
+
+#include "gimpoperationnormal.h"
+
+
+G_DEFINE_TYPE (GimpOperationNormal, gimp_operation_normal,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static const gchar* reference_xml = "<?xml version='1.0' encoding='UTF-8'?>"
+"<gegl>"
+"<node operation='gimp:normal'>"
+"  <node operation='gegl:load'>"
+"    <params>"
+"      <param name='path'>blending-test-B.png</param>"
+"    </params>"
+"  </node>"
+"</node>"
+"<node operation='gegl:load'>"
+"  <params>"
+"    <param name='path'>blending-test-A.png</param>"
+"  </params>"
+"</node>"
+"</gegl>";
+
+
+static void
+gimp_operation_normal_class_init (GimpOperationNormalClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",                  "gimp:normal",
+                                 "description",           "GIMP normal mode operation",
+                                 "reference-image",       "normal-mode.png",
+                                 "reference-composition", reference_xml,
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_normal_process;
+
+#if COMPILE_SSE2_INTRINISICS
+  if (gimp_cpu_accel_get_support() & GIMP_CPU_ACCEL_X86_SSE2)
+    layer_mode_class->process = gimp_operation_normal_process_sse2;
+#endif /* COMPILE_SSE2_INTRINISICS */
+
+#if COMPILE_SSE4_1_INTRINISICS
+  if (gimp_cpu_accel_get_support() & GIMP_CPU_ACCEL_X86_SSE4_1)
+    layer_mode_class->process = gimp_operation_normal_process_sse4;
+#endif /* COMPILE_SSE4_1_INTRINISICS */
+}
+
+static void
+gimp_operation_normal_init (GimpOperationNormal *self)
+{
+}
+
+gboolean
+gimp_operation_normal_process (GeglOperation       *op,
+                               void                *in_p,
+                               void                *layer_p,
+                               void                *mask_p,
+                               void                *out_p,
+                               glong                samples,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat layer_alpha;
+
+          layer_alpha = layer[ALPHA] * opacity;
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          out[ALPHA] = layer_alpha + in[ALPHA] - layer_alpha * in[ALPHA];
+
+          if (out[ALPHA])
+            {
+              gfloat layer_weight = layer_alpha / out[ALPHA];
+              gfloat in_weight    = 1.0f - layer_weight;
+              gint   b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b] * layer_weight + in[b] * in_weight;
+                }
+            }
+          else
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      while (samples--)
+        {
+          gfloat layer_alpha;
+
+          layer_alpha = layer[ALPHA] * opacity;
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          out[ALPHA] = in[ALPHA];
+
+          if (out[ALPHA])
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b] + (layer[b] - in[b]) * layer_alpha;
+                }
+            }
+          else
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat layer_alpha;
+
+          layer_alpha = layer[ALPHA] * opacity;
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          out[ALPHA] = layer_alpha;
+
+          if (out[ALPHA])
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+          else
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      while (samples--)
+        {
+          gfloat layer_alpha;
+
+          layer_alpha = layer[ALPHA] * opacity;
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          out[ALPHA] = in[ALPHA] * layer_alpha;
+
+          if (out[ALPHA])
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+          else
+            {
+              gint b;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationnormal.h b/app/operations/layer-modes/gimpoperationnormal.h
new file mode 100644
index 0000000..6fa1b36
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationnormal.h
@@ -0,0 +1,91 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationnormal.h
+ * Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_NORMAL_H__
+#define __GIMP_OPERATION_NORMAL_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_NORMAL            (gimp_operation_normal_get_type ())
+#define GIMP_OPERATION_NORMAL(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_NORMAL, GimpOperationNormal))
+#define GIMP_OPERATION_NORMAL_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_NORMAL, GimpOperationNormalClass))
+#define GIMP_IS_OPERATION_NORMAL(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_NORMAL))
+#define GIMP_IS_OPERATION_NORMAL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_NORMAL))
+#define GIMP_OPERATION_NORMAL_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_NORMAL, GimpOperationNormalClass))
+
+
+typedef struct _GimpOperationNormal      GimpOperationNormal;
+typedef struct _GimpOperationNormalClass GimpOperationNormalClass;
+
+struct _GimpOperationNormal
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationNormalClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType      gimp_operation_normal_get_type     (void) G_GNUC_CONST;
+
+
+/*  protected  */
+
+gboolean   gimp_operation_normal_process      (GeglOperation       *op,
+                                               void                *in,
+                                               void                *layer,
+                                               void                *mask,
+                                               void                *out,
+                                               glong                samples,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+#if COMPILE_SSE2_INTRINISICS
+
+gboolean   gimp_operation_normal_process_sse2 (GeglOperation       *op,
+                                               void                *in,
+                                               void                *layer,
+                                               void                *mask,
+                                               void                *out,
+                                               glong                samples,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+#endif /* COMPILE_SSE2_INTRINISICS */
+
+#if COMPILE_SSE4_1_INTRINISICS
+
+gboolean   gimp_operation_normal_process_sse4 (GeglOperation       *op,
+                                               void                *in,
+                                               void                *layer,
+                                               void                *mask,
+                                               void                *out,
+                                               glong                samples,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+#endif /* COMPILE_SSE4_1_INTRINISICS */
+
+
+#endif /* __GIMP_OPERATION_NORMAL_H__ */
diff --git a/app/operations/layer-modes/gimpoperationpassthrough.c b/app/operations/layer-modes/gimpoperationpassthrough.c
new file mode 100644
index 0000000..bc7d328
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationpassthrough.c
@@ -0,0 +1,55 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationpassthrough.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationpassthrough.h"
+
+
+G_DEFINE_TYPE (GimpOperationPassThrough, gimp_operation_pass_through,
+               GIMP_TYPE_OPERATION_REPLACE)
+
+
+static void
+gimp_operation_pass_through_class_init (GimpOperationPassThroughClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:pass-through",
+                                 "description", "GIMP pass through mode operation",
+                                 NULL);
+
+  /* don't use REPLACE mode's specialized get_affected_region(); PASS_THROUGH
+   * behaves like an ordinary layer mode here.
+   */
+  layer_mode_class->get_affected_region = NULL;
+}
+
+static void
+gimp_operation_pass_through_init (GimpOperationPassThrough *self)
+{
+}
diff --git a/app/operations/layer-modes/gimpoperationpassthrough.h b/app/operations/layer-modes/gimpoperationpassthrough.h
new file mode 100644
index 0000000..5a5b838
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationpassthrough.h
@@ -0,0 +1,54 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationpassthrough.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_PASS_THROUGH_H__
+#define __GIMP_OPERATION_PASS_THROUGH_H__
+
+
+#include "gimpoperationreplace.h"
+
+
+#define GIMP_TYPE_OPERATION_PASS_THROUGH            (gimp_operation_pass_through_get_type ())
+#define GIMP_OPERATION_PASS_THROUGH(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_PASS_THROUGH, GimpOperationPassThrough))
+#define GIMP_OPERATION_PASS_THROUGH_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_PASS_THROUGH, GimpOperationPassThroughClass))
+#define GIMP_IS_OPERATION_PASS_THROUGH(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_PASS_THROUGH))
+#define GIMP_IS_OPERATION_PASS_THROUGH_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_PASS_THROUGH))
+#define GIMP_OPERATION_PASS_THROUGH_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_PASS_THROUGH, GimpOperationPassThroughClass))
+
+
+typedef struct _GimpOperationPassThrough      GimpOperationPassThrough;
+typedef struct _GimpOperationPassThroughClass GimpOperationPassThroughClass;
+
+struct _GimpOperationPassThrough
+{
+  GimpOperationReplace parent_instance;
+};
+
+struct _GimpOperationPassThroughClass
+{
+  GimpOperationReplaceClass parent_class;
+};
+
+
+GType   gimp_operation_pass_through_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_PASS_THROUGH_H__ */
diff --git a/app/operations/layer-modes/gimpoperationreplace.c b/app/operations/layer-modes/gimpoperationreplace.c
new file mode 100644
index 0000000..ed1ac19
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationreplace.c
@@ -0,0 +1,347 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationreplace.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimp-layer-modes.h"
+#include "gimpoperationreplace.h"
+
+
+static GeglRectangle              gimp_operation_replace_get_bounding_box    (GeglOperation        *op);
+
+static gboolean                   gimp_operation_replace_parent_process      (GeglOperation        *op,
+                                                                              GeglOperationContext *context,
+                                                                              const gchar          *output_prop,
+                                                                              const GeglRectangle  *result,
+                                                                              gint                  level);
+static gboolean                   gimp_operation_replace_process             (GeglOperation          *op,
+                                                                              void                   *in,
+                                                                              void                   *layer,
+                                                                              void                   *mask,
+                                                                              void                   *out,
+                                                                              glong                   samples,
+                                                                              const GeglRectangle    *roi,
+                                                                              gint                    level);
+static GimpLayerCompositeRegion   gimp_operation_replace_get_affected_region (GimpOperationLayerMode *layer_mode);
+
+
+G_DEFINE_TYPE (GimpOperationReplace, gimp_operation_replace,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+#define parent_class gimp_operation_replace_parent_class
+
+
+static void
+gimp_operation_replace_class_init (GimpOperationReplaceClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:replace",
+                                 "description", "GIMP replace mode operation",
+                                 NULL);
+
+  operation_class->get_bounding_box     = gimp_operation_replace_get_bounding_box;
+
+  layer_mode_class->parent_process      = gimp_operation_replace_parent_process;
+  layer_mode_class->process             = gimp_operation_replace_process;
+  layer_mode_class->get_affected_region = gimp_operation_replace_get_affected_region;
+}
+
+static void
+gimp_operation_replace_init (GimpOperationReplace *self)
+{
+}
+
+static GeglRectangle
+gimp_operation_replace_get_bounding_box (GeglOperation *op)
+{
+  GimpOperationLayerMode   *self     = (gpointer) op;
+  GeglRectangle            *in_rect;
+  GeglRectangle            *aux_rect;
+  GeglRectangle            *aux2_rect;
+  GeglRectangle             src_rect = {};
+  GeglRectangle             dst_rect = {};
+  GeglRectangle             result;
+  GimpLayerCompositeRegion  included_region;
+
+  in_rect   = gegl_operation_source_get_bounding_box (op, "input");
+  aux_rect  = gegl_operation_source_get_bounding_box (op, "aux");
+  aux2_rect = gegl_operation_source_get_bounding_box (op, "aux2");
+
+  if (in_rect)
+    dst_rect = *in_rect;
+
+  if (aux_rect)
+    {
+      src_rect = *aux_rect;
+
+      if (aux2_rect)
+        gegl_rectangle_intersect (&src_rect, &src_rect, aux2_rect);
+    }
+
+  if (self->is_last_node)
+    {
+      included_region = GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+    }
+  else
+    {
+      included_region = gimp_layer_mode_get_included_region (self->layer_mode,
+                                                             self->composite_mode);
+    }
+
+  if (self->prop_opacity == 0.0)
+    included_region &= ~GIMP_LAYER_COMPOSITE_REGION_SOURCE;
+  else if (self->prop_opacity == 1.0 && ! aux2_rect)
+    included_region &= ~GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
+
+  gegl_rectangle_intersect (&result, &src_rect, &dst_rect);
+
+  if (included_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE)
+    gegl_rectangle_bounding_box (&result, &result, &src_rect);
+
+  if (included_region & GIMP_LAYER_COMPOSITE_REGION_DESTINATION)
+    gegl_rectangle_bounding_box (&result, &result, &dst_rect);
+
+  return result;
+}
+
+static gboolean
+gimp_operation_replace_parent_process (GeglOperation        *op,
+                                       GeglOperationContext *context,
+                                       const gchar          *output_prop,
+                                       const GeglRectangle  *result,
+                                       gint                  level)
+{
+  GimpOperationLayerMode   *layer_mode = (gpointer) op;
+  GimpLayerCompositeRegion  included_region;
+
+  included_region = gimp_layer_mode_get_included_region
+    (layer_mode->layer_mode, layer_mode->composite_mode);
+
+  /* if the layer's opacity is 100%, it has no mask, and its composite mode
+   * contains "aux" (the latter should always be the case in practice,
+   * currently,) we can just pass "aux" directly as output.
+   */
+  if (layer_mode->opacity == 1.0                       &&
+      ! gegl_operation_context_get_object (context, "aux2") &&
+      (included_region & GIMP_LAYER_COMPOSITE_REGION_SOURCE))
+    {
+      GObject *aux;
+
+      aux = gegl_operation_context_get_object (context, "aux");
+
+      gegl_operation_context_set_object (context, "output", aux);
+
+      return TRUE;
+    }
+  /* the opposite case, where the opacity is 0%, is handled by
+   * GimpOperationLayerMode.
+   */
+  else if (layer_mode->opacity == 0.0)
+    {
+    }
+  /* if both buffers are included in the result, and if both of them have the
+   * same content -- i.e., if they share the same storage, same alignment, and
+   * same abyss (or if the abyss is irrelevant) -- we can just pass either of
+   * them directly as output.
+   */
+  else if (included_region == GIMP_LAYER_COMPOSITE_REGION_UNION)
+    {
+      GObject *input;
+      GObject *aux;
+
+      input = gegl_operation_context_get_object (context, "input");
+      aux   = gegl_operation_context_get_object (context, "aux");
+
+      if (input && aux &&
+          gegl_buffer_share_storage (GEGL_BUFFER (input), GEGL_BUFFER (aux)))
+        {
+          gint input_shift_x;
+          gint input_shift_y;
+          gint aux_shift_x;
+          gint aux_shift_y;
+
+          g_object_get (input,
+                        "shift-x", &input_shift_x,
+                        "shift-y", &input_shift_y,
+                        NULL);
+          g_object_get (aux,
+                        "shift-x", &aux_shift_x,
+                        "shift-y", &aux_shift_y,
+                        NULL);
+
+          if (input_shift_x == aux_shift_x && input_shift_y == aux_shift_y)
+            {
+              const GeglRectangle *input_abyss;
+              const GeglRectangle *aux_abyss;
+
+              input_abyss = gegl_buffer_get_abyss (GEGL_BUFFER (input));
+              aux_abyss   = gegl_buffer_get_abyss (GEGL_BUFFER (aux));
+
+              if (gegl_rectangle_equal (input_abyss, aux_abyss)  ||
+                  (gegl_rectangle_contains (input_abyss, result) &&
+                   gegl_rectangle_contains (aux_abyss,   result)))
+                {
+                  gegl_operation_context_set_object (context, "output", input);
+
+                  return TRUE;
+                }
+            }
+        }
+    }
+
+  return GIMP_OPERATION_LAYER_MODE_CLASS (parent_class)->parent_process (
+    op, context, output_prop, result, level);
+}
+
+static gboolean
+gimp_operation_replace_process (GeglOperation       *op,
+                                void                *in_p,
+                                void                *layer_p,
+                                void                *mask_p,
+                                void                *out_p,
+                                glong                samples,
+                                const GeglRectangle *roi,
+                                gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat opacity_value = opacity;
+          gfloat new_alpha;
+          gfloat ratio;
+          gint   b;
+
+          if (has_mask)
+            opacity_value *= *mask;
+
+          new_alpha = (layer[ALPHA] - in[ALPHA]) * opacity_value + in[ALPHA];
+
+          ratio = opacity_value;
+
+          if (new_alpha)
+            ratio *= layer[ALPHA] / new_alpha;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = (layer[b] - in[b]) * ratio + in[b];
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+      while (samples--)
+        {
+          gfloat opacity_value = opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            opacity_value *= *mask;
+
+          new_alpha = in[ALPHA] * (1.0f - opacity_value);
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = in[b];
+
+          out[ALPHA] = new_alpha;
+
+          in  += 4;
+          out += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat opacity_value = opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            opacity_value *= *mask;
+
+          new_alpha = layer[ALPHA] * opacity_value;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = layer[b];
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      memset (out, 0, 4 * samples * sizeof (gfloat));
+      break;
+    }
+
+  return TRUE;
+}
+
+static GimpLayerCompositeRegion
+gimp_operation_replace_get_affected_region (GimpOperationLayerMode *layer_mode)
+{
+  GimpLayerCompositeRegion affected_region = GIMP_LAYER_COMPOSITE_REGION_INTERSECTION;
+
+  if (layer_mode->prop_opacity != 0.0)
+    affected_region |= GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
+
+  /* if opacity != 1.0, or we have a mask, then we also affect SOURCE, but this
+   * is considered the case anyway, so no need for special handling.
+   */
+
+  return affected_region;
+}
diff --git a/app/operations/layer-modes/gimpoperationreplace.h b/app/operations/layer-modes/gimpoperationreplace.h
new file mode 100644
index 0000000..f8d7b0c
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationreplace.h
@@ -0,0 +1,53 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationreplace.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_REPLACE_H__
+#define __GIMP_OPERATION_REPLACE_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_REPLACE            (gimp_operation_replace_get_type ())
+#define GIMP_OPERATION_REPLACE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_REPLACE, GimpOperationReplace))
+#define GIMP_OPERATION_REPLACE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_REPLACE, GimpOperationReplaceClass))
+#define GIMP_IS_OPERATION_REPLACE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_REPLACE))
+#define GIMP_IS_OPERATION_REPLACE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_REPLACE))
+#define GIMP_OPERATION_REPLACE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_REPLACE, GimpOperationReplaceClass))
+
+
+typedef struct _GimpOperationReplace      GimpOperationReplace;
+typedef struct _GimpOperationReplaceClass GimpOperationReplaceClass;
+
+struct _GimpOperationReplace
+{
+  GimpOperationLayerMode parent_instance;
+};
+
+struct _GimpOperationReplaceClass
+{
+  GimpOperationLayerModeClass parent_class;
+};
+
+
+GType   gimp_operation_replace_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_REPLACE_H__ */
diff --git a/app/operations/layer-modes/gimpoperationsplit.c b/app/operations/layer-modes/gimpoperationsplit.c
new file mode 100644
index 0000000..fe83d3f
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationsplit.c
@@ -0,0 +1,213 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsplit.c
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationsplit.h"
+
+
+static gboolean   gimp_operation_split_process (GeglOperation       *op,
+                                                void                *in,
+                                                void                *layer,
+                                                void                *mask,
+                                                void                *out,
+                                                glong                samples,
+                                                const GeglRectangle *roi,
+                                                gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationSplit, gimp_operation_split,
+               GIMP_TYPE_OPERATION_LAYER_MODE)
+
+
+static void
+gimp_operation_split_class_init (GimpOperationSplitClass *klass)
+{
+  GeglOperationClass          *operation_class  = GEGL_OPERATION_CLASS (klass);
+  GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:split",
+                                 "description", "GIMP split mode operation",
+                                 NULL);
+
+  layer_mode_class->process = gimp_operation_split_process;
+}
+
+static void
+gimp_operation_split_init (GimpOperationSplit *self)
+{
+}
+
+static gboolean
+gimp_operation_split_process (GeglOperation       *op,
+                              void                *in_p,
+                              void                *layer_p,
+                              void                *mask_p,
+                              void                *out_p,
+                              glong                samples,
+                              const GeglRectangle *roi,
+                              gint                 level)
+{
+  GimpOperationLayerMode *layer_mode = (gpointer) op;
+  gfloat                 *in         = in_p;
+  gfloat                 *out        = out_p;
+  gfloat                 *layer      = layer_p;
+  gfloat                 *mask       = mask_p;
+  gfloat                  opacity    = layer_mode->opacity;
+  const gboolean          has_mask   = mask != NULL;
+
+  switch (layer_mode->composite_mode)
+    {
+    case GIMP_LAYER_COMPOSITE_UNION:
+      while (samples--)
+        {
+          gfloat in_alpha    = in[ALPHA];
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          if (layer_alpha <= in_alpha)
+            {
+              new_alpha = in_alpha - layer_alpha;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+          else
+            {
+              new_alpha = layer_alpha - in_alpha;
+
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
+    case GIMP_LAYER_COMPOSITE_AUTO:
+      while (samples--)
+        {
+          gfloat in_alpha    = in[ALPHA];
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          new_alpha = MAX (in_alpha - layer_alpha, 0.0f);
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
+      while (samples--)
+        {
+          gfloat in_alpha    = in[ALPHA];
+          gfloat layer_alpha = layer[ALPHA] * opacity;
+          gfloat new_alpha;
+          gint   b;
+
+          if (has_mask)
+            layer_alpha *= *mask;
+
+          new_alpha = MAX (layer_alpha - in_alpha, 0.0f);
+
+          if (new_alpha != 0.0f)
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = layer[b];
+                }
+            }
+          else
+            {
+              for (b = RED; b < ALPHA; b++)
+                {
+                  out[b] = in[b];
+                }
+            }
+
+          out[ALPHA] = new_alpha;
+
+          in    += 4;
+          layer += 4;
+          out   += 4;
+
+          if (has_mask)
+            mask++;
+        }
+      break;
+
+    case GIMP_LAYER_COMPOSITE_INTERSECTION:
+      while (samples--)
+        {
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            {
+              out[b] = in[b];
+            }
+
+          out[ALPHA] = 0.0f;
+
+          in    += 4;
+          out   += 4;
+        }
+      break;
+    }
+
+  return TRUE;
+}
diff --git a/app/operations/layer-modes/gimpoperationsplit.h b/app/operations/layer-modes/gimpoperationsplit.h
new file mode 100644
index 0000000..e1dbbe9
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationsplit.h
@@ -0,0 +1,54 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationsplit.h
+ * Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_SPLIT_H__
+#define __GIMP_OPERATION_SPLIT_H__
+
+
+#include "gimpoperationlayermode.h"
+
+
+#define GIMP_TYPE_OPERATION_SPLIT            (gimp_operation_split_get_type ())
+#define GIMP_OPERATION_SPLIT(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_SPLIT, GimpOperationSplit))
+#define GIMP_OPERATION_SPLIT_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  GIMP_TYPE_OPERATION_SPLIT, GimpOperationSplitClass))
+#define GIMP_IS_OPERATION_SPLIT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_SPLIT))
+#define GIMP_IS_OPERATION_SPLIT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  GIMP_TYPE_OPERATION_SPLIT))
+#define GIMP_OPERATION_SPLIT_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  GIMP_TYPE_OPERATION_SPLIT, GimpOperationSplitClass))
+
+
+typedef struct _GimpOperationSplit      GimpOperationSplit;
+typedef struct _GimpOperationSplitClass GimpOperationSplitClass;
+
+struct _GimpOperationSplit
+{
+  GimpOperationLayerMode  parent_instance;
+};
+
+struct _GimpOperationSplitClass
+{
+  GimpOperationLayerModeClass  parent_class;
+};
+
+
+GType   gimp_operation_split_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_SPLIT_H__ */
diff --git a/app/operations/operations-enums.c b/app/operations/operations-enums.c
new file mode 100644
index 0000000..1e8101d
--- /dev/null
+++ b/app/operations/operations-enums.c
@@ -0,0 +1,370 @@
+
+/* Generated data (by gimp-mkenums) */
+
+#include "config.h"
+#include <gio/gio.h>
+#include "libgimpbase/gimpbase.h"
+#include "operations-enums.h"
+#include "gimp-intl.h"
+
+/* enumerations from "operations-enums.h" */
+GType
+gimp_layer_color_space_get_type (void)
+{
+  static const GEnumValue values[] =
+  {
+    { GIMP_LAYER_COLOR_SPACE_AUTO, "GIMP_LAYER_COLOR_SPACE_AUTO", "auto" },
+    { GIMP_LAYER_COLOR_SPACE_RGB_LINEAR, "GIMP_LAYER_COLOR_SPACE_RGB_LINEAR", "rgb-linear" },
+    { GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL, "GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL", "rgb-perceptual" },
+    { GIMP_LAYER_COLOR_SPACE_LAB, "GIMP_LAYER_COLOR_SPACE_LAB", "lab" },
+    { 0, NULL, NULL }
+  };
+
+  static const GimpEnumDesc descs[] =
+  {
+    { GIMP_LAYER_COLOR_SPACE_AUTO, NC_("layer-color-space", "Auto"), NULL },
+    { GIMP_LAYER_COLOR_SPACE_RGB_LINEAR, NC_("layer-color-space", "RGB (linear)"), NULL },
+    { GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL, NC_("layer-color-space", "RGB (perceptual)"), NULL },
+    { GIMP_LAYER_COLOR_SPACE_LAB, NC_("layer-color-space", "LAB"), NULL },
+    { 0, NULL, NULL }
+  };
+
+  static GType type = 0;
+
+  if (G_UNLIKELY (! type))
+    {
+      type = g_enum_register_static ("GimpLayerColorSpace", values);
+      gimp_type_set_translation_context (type, "layer-color-space");
+      gimp_enum_set_value_descriptions (type, descs);
+    }
+
+  return type;
+}
+
+GType
+gimp_layer_composite_mode_get_type (void)
+{
+  static const GEnumValue values[] =
+  {
+    { GIMP_LAYER_COMPOSITE_AUTO, "GIMP_LAYER_COMPOSITE_AUTO", "auto" },
+    { GIMP_LAYER_COMPOSITE_UNION, "GIMP_LAYER_COMPOSITE_UNION", "union" },
+    { GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP, "GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP", "clip-to-backdrop" },
+    { GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER, "GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER", "clip-to-layer" },
+    { GIMP_LAYER_COMPOSITE_INTERSECTION, "GIMP_LAYER_COMPOSITE_INTERSECTION", "intersection" },
+    { 0, NULL, NULL }
+  };
+
+  static const GimpEnumDesc descs[] =
+  {
+    { GIMP_LAYER_COMPOSITE_AUTO, NC_("layer-composite-mode", "Auto"), NULL },
+    { GIMP_LAYER_COMPOSITE_UNION, NC_("layer-composite-mode", "Union"), NULL },
+    { GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP, NC_("layer-composite-mode", "Clip to backdrop"), NULL },
+    { GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER, NC_("layer-composite-mode", "Clip to layer"), NULL },
+    { GIMP_LAYER_COMPOSITE_INTERSECTION, NC_("layer-composite-mode", "Intersection"), NULL },
+    { 0, NULL, NULL }
+  };
+
+  static GType type = 0;
+
+  if (G_UNLIKELY (! type))
+    {
+      type = g_enum_register_static ("GimpLayerCompositeMode", values);
+      gimp_type_set_translation_context (type, "layer-composite-mode");
+      gimp_enum_set_value_descriptions (type, descs);
+    }
+
+  return type;
+}
+
+GType
+gimp_layer_mode_get_type (void)
+{
+  static const GEnumValue values[] =
+  {
+    { GIMP_LAYER_MODE_NORMAL_LEGACY, "GIMP_LAYER_MODE_NORMAL_LEGACY", "normal-legacy" },
+    { GIMP_LAYER_MODE_DISSOLVE, "GIMP_LAYER_MODE_DISSOLVE", "dissolve" },
+    { GIMP_LAYER_MODE_BEHIND_LEGACY, "GIMP_LAYER_MODE_BEHIND_LEGACY", "behind-legacy" },
+    { GIMP_LAYER_MODE_MULTIPLY_LEGACY, "GIMP_LAYER_MODE_MULTIPLY_LEGACY", "multiply-legacy" },
+    { GIMP_LAYER_MODE_SCREEN_LEGACY, "GIMP_LAYER_MODE_SCREEN_LEGACY", "screen-legacy" },
+    { GIMP_LAYER_MODE_OVERLAY_LEGACY, "GIMP_LAYER_MODE_OVERLAY_LEGACY", "overlay-legacy" },
+    { GIMP_LAYER_MODE_DIFFERENCE_LEGACY, "GIMP_LAYER_MODE_DIFFERENCE_LEGACY", "difference-legacy" },
+    { GIMP_LAYER_MODE_ADDITION_LEGACY, "GIMP_LAYER_MODE_ADDITION_LEGACY", "addition-legacy" },
+    { GIMP_LAYER_MODE_SUBTRACT_LEGACY, "GIMP_LAYER_MODE_SUBTRACT_LEGACY", "subtract-legacy" },
+    { GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY, "GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY", "darken-only-legacy" },
+    { GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY, "GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY", "lighten-only-legacy" },
+    { GIMP_LAYER_MODE_HSV_HUE_LEGACY, "GIMP_LAYER_MODE_HSV_HUE_LEGACY", "hsv-hue-legacy" },
+    { GIMP_LAYER_MODE_HSV_SATURATION_LEGACY, "GIMP_LAYER_MODE_HSV_SATURATION_LEGACY", "hsv-saturation-legacy" },
+    { GIMP_LAYER_MODE_HSL_COLOR_LEGACY, "GIMP_LAYER_MODE_HSL_COLOR_LEGACY", "hsl-color-legacy" },
+    { GIMP_LAYER_MODE_HSV_VALUE_LEGACY, "GIMP_LAYER_MODE_HSV_VALUE_LEGACY", "hsv-value-legacy" },
+    { GIMP_LAYER_MODE_DIVIDE_LEGACY, "GIMP_LAYER_MODE_DIVIDE_LEGACY", "divide-legacy" },
+    { GIMP_LAYER_MODE_DODGE_LEGACY, "GIMP_LAYER_MODE_DODGE_LEGACY", "dodge-legacy" },
+    { GIMP_LAYER_MODE_BURN_LEGACY, "GIMP_LAYER_MODE_BURN_LEGACY", "burn-legacy" },
+    { GIMP_LAYER_MODE_HARDLIGHT_LEGACY, "GIMP_LAYER_MODE_HARDLIGHT_LEGACY", "hardlight-legacy" },
+    { GIMP_LAYER_MODE_SOFTLIGHT_LEGACY, "GIMP_LAYER_MODE_SOFTLIGHT_LEGACY", "softlight-legacy" },
+    { GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY, "GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY", "grain-extract-legacy" },
+    { GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY, "GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY", "grain-merge-legacy" },
+    { GIMP_LAYER_MODE_COLOR_ERASE_LEGACY, "GIMP_LAYER_MODE_COLOR_ERASE_LEGACY", "color-erase-legacy" },
+    { GIMP_LAYER_MODE_OVERLAY, "GIMP_LAYER_MODE_OVERLAY", "overlay" },
+    { GIMP_LAYER_MODE_LCH_HUE, "GIMP_LAYER_MODE_LCH_HUE", "lch-hue" },
+    { GIMP_LAYER_MODE_LCH_CHROMA, "GIMP_LAYER_MODE_LCH_CHROMA", "lch-chroma" },
+    { GIMP_LAYER_MODE_LCH_COLOR, "GIMP_LAYER_MODE_LCH_COLOR", "lch-color" },
+    { GIMP_LAYER_MODE_LCH_LIGHTNESS, "GIMP_LAYER_MODE_LCH_LIGHTNESS", "lch-lightness" },
+    { GIMP_LAYER_MODE_NORMAL, "GIMP_LAYER_MODE_NORMAL", "normal" },
+    { GIMP_LAYER_MODE_BEHIND, "GIMP_LAYER_MODE_BEHIND", "behind" },
+    { GIMP_LAYER_MODE_MULTIPLY, "GIMP_LAYER_MODE_MULTIPLY", "multiply" },
+    { GIMP_LAYER_MODE_SCREEN, "GIMP_LAYER_MODE_SCREEN", "screen" },
+    { GIMP_LAYER_MODE_DIFFERENCE, "GIMP_LAYER_MODE_DIFFERENCE", "difference" },
+    { GIMP_LAYER_MODE_ADDITION, "GIMP_LAYER_MODE_ADDITION", "addition" },
+    { GIMP_LAYER_MODE_SUBTRACT, "GIMP_LAYER_MODE_SUBTRACT", "subtract" },
+    { GIMP_LAYER_MODE_DARKEN_ONLY, "GIMP_LAYER_MODE_DARKEN_ONLY", "darken-only" },
+    { GIMP_LAYER_MODE_LIGHTEN_ONLY, "GIMP_LAYER_MODE_LIGHTEN_ONLY", "lighten-only" },
+    { GIMP_LAYER_MODE_HSV_HUE, "GIMP_LAYER_MODE_HSV_HUE", "hsv-hue" },
+    { GIMP_LAYER_MODE_HSV_SATURATION, "GIMP_LAYER_MODE_HSV_SATURATION", "hsv-saturation" },
+    { GIMP_LAYER_MODE_HSL_COLOR, "GIMP_LAYER_MODE_HSL_COLOR", "hsl-color" },
+    { GIMP_LAYER_MODE_HSV_VALUE, "GIMP_LAYER_MODE_HSV_VALUE", "hsv-value" },
+    { GIMP_LAYER_MODE_DIVIDE, "GIMP_LAYER_MODE_DIVIDE", "divide" },
+    { GIMP_LAYER_MODE_DODGE, "GIMP_LAYER_MODE_DODGE", "dodge" },
+    { GIMP_LAYER_MODE_BURN, "GIMP_LAYER_MODE_BURN", "burn" },
+    { GIMP_LAYER_MODE_HARDLIGHT, "GIMP_LAYER_MODE_HARDLIGHT", "hardlight" },
+    { GIMP_LAYER_MODE_SOFTLIGHT, "GIMP_LAYER_MODE_SOFTLIGHT", "softlight" },
+    { GIMP_LAYER_MODE_GRAIN_EXTRACT, "GIMP_LAYER_MODE_GRAIN_EXTRACT", "grain-extract" },
+    { GIMP_LAYER_MODE_GRAIN_MERGE, "GIMP_LAYER_MODE_GRAIN_MERGE", "grain-merge" },
+    { GIMP_LAYER_MODE_VIVID_LIGHT, "GIMP_LAYER_MODE_VIVID_LIGHT", "vivid-light" },
+    { GIMP_LAYER_MODE_PIN_LIGHT, "GIMP_LAYER_MODE_PIN_LIGHT", "pin-light" },
+    { GIMP_LAYER_MODE_LINEAR_LIGHT, "GIMP_LAYER_MODE_LINEAR_LIGHT", "linear-light" },
+    { GIMP_LAYER_MODE_HARD_MIX, "GIMP_LAYER_MODE_HARD_MIX", "hard-mix" },
+    { GIMP_LAYER_MODE_EXCLUSION, "GIMP_LAYER_MODE_EXCLUSION", "exclusion" },
+    { GIMP_LAYER_MODE_LINEAR_BURN, "GIMP_LAYER_MODE_LINEAR_BURN", "linear-burn" },
+    { GIMP_LAYER_MODE_LUMA_DARKEN_ONLY, "GIMP_LAYER_MODE_LUMA_DARKEN_ONLY", "luma-darken-only" },
+    { GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY, "GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY", "luma-lighten-only" },
+    { GIMP_LAYER_MODE_LUMINANCE, "GIMP_LAYER_MODE_LUMINANCE", "luminance" },
+    { GIMP_LAYER_MODE_COLOR_ERASE, "GIMP_LAYER_MODE_COLOR_ERASE", "color-erase" },
+    { GIMP_LAYER_MODE_ERASE, "GIMP_LAYER_MODE_ERASE", "erase" },
+    { GIMP_LAYER_MODE_MERGE, "GIMP_LAYER_MODE_MERGE", "merge" },
+    { GIMP_LAYER_MODE_SPLIT, "GIMP_LAYER_MODE_SPLIT", "split" },
+    { GIMP_LAYER_MODE_PASS_THROUGH, "GIMP_LAYER_MODE_PASS_THROUGH", "pass-through" },
+    { GIMP_LAYER_MODE_REPLACE, "GIMP_LAYER_MODE_REPLACE", "replace" },
+    { GIMP_LAYER_MODE_ANTI_ERASE, "GIMP_LAYER_MODE_ANTI_ERASE", "anti-erase" },
+    { 0, NULL, NULL }
+  };
+
+  static const GimpEnumDesc descs[] =
+  {
+    { GIMP_LAYER_MODE_NORMAL_LEGACY, NC_("layer-mode", "Normal (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Normal (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_NORMAL_LEGACY, NC_("layer-mode", "Normal (l)"), NULL },
+    { GIMP_LAYER_MODE_DISSOLVE, NC_("layer-mode", "Dissolve"), NULL },
+    { GIMP_LAYER_MODE_BEHIND_LEGACY, NC_("layer-mode", "Behind (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Behind (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_BEHIND_LEGACY, NC_("layer-mode", "Behind (l)"), NULL },
+    { GIMP_LAYER_MODE_MULTIPLY_LEGACY, NC_("layer-mode", "Multiply (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Multiply (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_MULTIPLY_LEGACY, NC_("layer-mode", "Multiply (l)"), NULL },
+    { GIMP_LAYER_MODE_SCREEN_LEGACY, NC_("layer-mode", "Screen (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Screen (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_SCREEN_LEGACY, NC_("layer-mode", "Screen (l)"), NULL },
+    { GIMP_LAYER_MODE_OVERLAY_LEGACY, NC_("layer-mode", "Old broken Overlay"), NULL },
+    /* Translators: this is an abbreviated version of "Old broken Overlay".
+       Keep it short. */
+    { GIMP_LAYER_MODE_OVERLAY_LEGACY, NC_("layer-mode", "Old Overlay"), NULL },
+    { GIMP_LAYER_MODE_DIFFERENCE_LEGACY, NC_("layer-mode", "Difference (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Difference (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_DIFFERENCE_LEGACY, NC_("layer-mode", "Difference (l)"), NULL },
+    { GIMP_LAYER_MODE_ADDITION_LEGACY, NC_("layer-mode", "Addition (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Addition (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_ADDITION_LEGACY, NC_("layer-mode", "Addition (l)"), NULL },
+    { GIMP_LAYER_MODE_SUBTRACT_LEGACY, NC_("layer-mode", "Subtract (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Subtract (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_SUBTRACT_LEGACY, NC_("layer-mode", "Subtract (l)"), NULL },
+    { GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY, NC_("layer-mode", "Darken only (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Darken only (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY, NC_("layer-mode", "Darken only (l)"), NULL },
+    { GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY, NC_("layer-mode", "Lighten only (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Lighten only (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY, NC_("layer-mode", "Lighten only (l)"), NULL },
+    { GIMP_LAYER_MODE_HSV_HUE_LEGACY, NC_("layer-mode", "HSV Hue (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "HSV Hue (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_HSV_HUE_LEGACY, NC_("layer-mode", "HSV Hue (l)"), NULL },
+    { GIMP_LAYER_MODE_HSV_SATURATION_LEGACY, NC_("layer-mode", "HSV Saturation (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "HSV Saturation (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_HSV_SATURATION_LEGACY, NC_("layer-mode", "HSV Saturation (l)"), NULL },
+    { GIMP_LAYER_MODE_HSL_COLOR_LEGACY, NC_("layer-mode", "HSL Color (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "HSL Color (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_HSL_COLOR_LEGACY, NC_("layer-mode", "HSL Color (l)"), NULL },
+    { GIMP_LAYER_MODE_HSV_VALUE_LEGACY, NC_("layer-mode", "HSV Value (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "HSV Value (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_HSV_VALUE_LEGACY, NC_("layer-mode", "HSV Value (l)"), NULL },
+    { GIMP_LAYER_MODE_DIVIDE_LEGACY, NC_("layer-mode", "Divide (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Divide (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_DIVIDE_LEGACY, NC_("layer-mode", "Divide (l)"), NULL },
+    { GIMP_LAYER_MODE_DODGE_LEGACY, NC_("layer-mode", "Dodge (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Dodge (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_DODGE_LEGACY, NC_("layer-mode", "Dodge (l)"), NULL },
+    { GIMP_LAYER_MODE_BURN_LEGACY, NC_("layer-mode", "Burn (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Burn (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_BURN_LEGACY, NC_("layer-mode", "Burn (l)"), NULL },
+    { GIMP_LAYER_MODE_HARDLIGHT_LEGACY, NC_("layer-mode", "Hard light (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Hard light (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_HARDLIGHT_LEGACY, NC_("layer-mode", "Hard light (l)"), NULL },
+    { GIMP_LAYER_MODE_SOFTLIGHT_LEGACY, NC_("layer-mode", "Soft light (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Soft light (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_SOFTLIGHT_LEGACY, NC_("layer-mode", "Soft light (l)"), NULL },
+    { GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY, NC_("layer-mode", "Grain extract (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Grain extract (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY, NC_("layer-mode", "Grain extract (l)"), NULL },
+    { GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY, NC_("layer-mode", "Grain merge (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Grain merge (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY, NC_("layer-mode", "Grain merge (l)"), NULL },
+    { GIMP_LAYER_MODE_COLOR_ERASE_LEGACY, NC_("layer-mode", "Color erase (legacy)"), NULL },
+    /* Translators: this is an abbreviated version of "Color erase (legacy)".
+       Keep it short. */
+    { GIMP_LAYER_MODE_COLOR_ERASE_LEGACY, NC_("layer-mode", "Color erase (l)"), NULL },
+    { GIMP_LAYER_MODE_OVERLAY, NC_("layer-mode", "Overlay"), NULL },
+    { GIMP_LAYER_MODE_LCH_HUE, NC_("layer-mode", "LCh Hue"), NULL },
+    { GIMP_LAYER_MODE_LCH_CHROMA, NC_("layer-mode", "LCh Chroma"), NULL },
+    { GIMP_LAYER_MODE_LCH_COLOR, NC_("layer-mode", "LCh Color"), NULL },
+    { GIMP_LAYER_MODE_LCH_LIGHTNESS, NC_("layer-mode", "LCh Lightness"), NULL },
+    { GIMP_LAYER_MODE_NORMAL, NC_("layer-mode", "Normal"), NULL },
+    { GIMP_LAYER_MODE_BEHIND, NC_("layer-mode", "Behind"), NULL },
+    { GIMP_LAYER_MODE_MULTIPLY, NC_("layer-mode", "Multiply"), NULL },
+    { GIMP_LAYER_MODE_SCREEN, NC_("layer-mode", "Screen"), NULL },
+    { GIMP_LAYER_MODE_DIFFERENCE, NC_("layer-mode", "Difference"), NULL },
+    { GIMP_LAYER_MODE_ADDITION, NC_("layer-mode", "Addition"), NULL },
+    { GIMP_LAYER_MODE_SUBTRACT, NC_("layer-mode", "Subtract"), NULL },
+    { GIMP_LAYER_MODE_DARKEN_ONLY, NC_("layer-mode", "Darken only"), NULL },
+    { GIMP_LAYER_MODE_LIGHTEN_ONLY, NC_("layer-mode", "Lighten only"), NULL },
+    { GIMP_LAYER_MODE_HSV_HUE, NC_("layer-mode", "HSV Hue"), NULL },
+    { GIMP_LAYER_MODE_HSV_SATURATION, NC_("layer-mode", "HSV Saturation"), NULL },
+    { GIMP_LAYER_MODE_HSL_COLOR, NC_("layer-mode", "HSL Color"), NULL },
+    { GIMP_LAYER_MODE_HSV_VALUE, NC_("layer-mode", "HSV Value"), NULL },
+    { GIMP_LAYER_MODE_DIVIDE, NC_("layer-mode", "Divide"), NULL },
+    { GIMP_LAYER_MODE_DODGE, NC_("layer-mode", "Dodge"), NULL },
+    { GIMP_LAYER_MODE_BURN, NC_("layer-mode", "Burn"), NULL },
+    { GIMP_LAYER_MODE_HARDLIGHT, NC_("layer-mode", "Hard light"), NULL },
+    { GIMP_LAYER_MODE_SOFTLIGHT, NC_("layer-mode", "Soft light"), NULL },
+    { GIMP_LAYER_MODE_GRAIN_EXTRACT, NC_("layer-mode", "Grain extract"), NULL },
+    { GIMP_LAYER_MODE_GRAIN_MERGE, NC_("layer-mode", "Grain merge"), NULL },
+    { GIMP_LAYER_MODE_VIVID_LIGHT, NC_("layer-mode", "Vivid light"), NULL },
+    { GIMP_LAYER_MODE_PIN_LIGHT, NC_("layer-mode", "Pin light"), NULL },
+    { GIMP_LAYER_MODE_LINEAR_LIGHT, NC_("layer-mode", "Linear light"), NULL },
+    { GIMP_LAYER_MODE_HARD_MIX, NC_("layer-mode", "Hard mix"), NULL },
+    { GIMP_LAYER_MODE_EXCLUSION, NC_("layer-mode", "Exclusion"), NULL },
+    { GIMP_LAYER_MODE_LINEAR_BURN, NC_("layer-mode", "Linear burn"), NULL },
+    { GIMP_LAYER_MODE_LUMA_DARKEN_ONLY, NC_("layer-mode", "Luma/Luminance darken only"), NULL },
+    /* Translators: this is an abbreviated version of "Luma/Luminance darken only".
+       Keep it short. */
+    { GIMP_LAYER_MODE_LUMA_DARKEN_ONLY, NC_("layer-mode", "Luma darken only"), NULL },
+    { GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY, NC_("layer-mode", "Luma/Luminance lighten only"), NULL },
+    /* Translators: this is an abbreviated version of "Luma/Luminance lighten only".
+       Keep it short. */
+    { GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY, NC_("layer-mode", "Luma lighten only"), NULL },
+    { GIMP_LAYER_MODE_LUMINANCE, NC_("layer-mode", "Luminance"), NULL },
+    { GIMP_LAYER_MODE_COLOR_ERASE, NC_("layer-mode", "Color erase"), NULL },
+    { GIMP_LAYER_MODE_ERASE, NC_("layer-mode", "Erase"), NULL },
+    { GIMP_LAYER_MODE_MERGE, NC_("layer-mode", "Merge"), NULL },
+    { GIMP_LAYER_MODE_SPLIT, NC_("layer-mode", "Split"), NULL },
+    { GIMP_LAYER_MODE_PASS_THROUGH, NC_("layer-mode", "Pass through"), NULL },
+    { GIMP_LAYER_MODE_REPLACE, NC_("layer-mode", "Replace"), NULL },
+    { GIMP_LAYER_MODE_ANTI_ERASE, NC_("layer-mode", "Anti erase"), NULL },
+    { 0, NULL, NULL }
+  };
+
+  static GType type = 0;
+
+  if (G_UNLIKELY (! type))
+    {
+      type = g_enum_register_static ("GimpLayerMode", values);
+      gimp_type_set_translation_context (type, "layer-mode");
+      gimp_enum_set_value_descriptions (type, descs);
+    }
+
+  return type;
+}
+
+GType
+gimp_layer_mode_group_get_type (void)
+{
+  static const GEnumValue values[] =
+  {
+    { GIMP_LAYER_MODE_GROUP_DEFAULT, "GIMP_LAYER_MODE_GROUP_DEFAULT", "default" },
+    { GIMP_LAYER_MODE_GROUP_LEGACY, "GIMP_LAYER_MODE_GROUP_LEGACY", "legacy" },
+    { 0, NULL, NULL }
+  };
+
+  static const GimpEnumDesc descs[] =
+  {
+    { GIMP_LAYER_MODE_GROUP_DEFAULT, NC_("layer-mode-group", "Default"), NULL },
+    { GIMP_LAYER_MODE_GROUP_LEGACY, NC_("layer-mode-group", "Legacy"), NULL },
+    { 0, NULL, NULL }
+  };
+
+  static GType type = 0;
+
+  if (G_UNLIKELY (! type))
+    {
+      type = g_enum_register_static ("GimpLayerModeGroup", values);
+      gimp_type_set_translation_context (type, "layer-mode-group");
+      gimp_enum_set_value_descriptions (type, descs);
+    }
+
+  return type;
+}
+
+GType
+gimp_layer_mode_context_get_type (void)
+{
+  static const GFlagsValue values[] =
+  {
+    { GIMP_LAYER_MODE_CONTEXT_LAYER, "GIMP_LAYER_MODE_CONTEXT_LAYER", "layer" },
+    { GIMP_LAYER_MODE_CONTEXT_GROUP, "GIMP_LAYER_MODE_CONTEXT_GROUP", "group" },
+    { GIMP_LAYER_MODE_CONTEXT_PAINT, "GIMP_LAYER_MODE_CONTEXT_PAINT", "paint" },
+    { GIMP_LAYER_MODE_CONTEXT_FILTER, "GIMP_LAYER_MODE_CONTEXT_FILTER", "filter" },
+    { GIMP_LAYER_MODE_CONTEXT_ALL, "GIMP_LAYER_MODE_CONTEXT_ALL", "all" },
+    { 0, NULL, NULL }
+  };
+
+  static const GimpFlagsDesc descs[] =
+  {
+    { GIMP_LAYER_MODE_CONTEXT_LAYER, "GIMP_LAYER_MODE_CONTEXT_LAYER", NULL },
+    { GIMP_LAYER_MODE_CONTEXT_GROUP, "GIMP_LAYER_MODE_CONTEXT_GROUP", NULL },
+    { GIMP_LAYER_MODE_CONTEXT_PAINT, "GIMP_LAYER_MODE_CONTEXT_PAINT", NULL },
+    { GIMP_LAYER_MODE_CONTEXT_FILTER, "GIMP_LAYER_MODE_CONTEXT_FILTER", NULL },
+    { GIMP_LAYER_MODE_CONTEXT_ALL, "GIMP_LAYER_MODE_CONTEXT_ALL", NULL },
+    { 0, NULL, NULL }
+  };
+
+  static GType type = 0;
+
+  if (G_UNLIKELY (! type))
+    {
+      type = g_flags_register_static ("GimpLayerModeContext", values);
+      gimp_type_set_translation_context (type, "layer-mode-context");
+      gimp_flags_set_value_descriptions (type, descs);
+    }
+
+  return type;
+}
+
+
+/* Generated data ends here */
+
diff --git a/app/operations/operations-enums.h b/app/operations/operations-enums.h
new file mode 100644
index 0000000..0dc51b9
--- /dev/null
+++ b/app/operations/operations-enums.h
@@ -0,0 +1,190 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * operations-enums.h
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __OPERATIONS_ENUMS_H__
+#define __OPERATIONS_ENUMS_H__
+
+
+#define GIMP_TYPE_LAYER_COLOR_SPACE (gimp_layer_color_space_get_type ())
+
+GType gimp_layer_color_space_get_type (void) G_GNUC_CONST;
+
+typedef enum
+{
+  GIMP_LAYER_COLOR_SPACE_AUTO,           /*< desc="Auto"             >*/
+  GIMP_LAYER_COLOR_SPACE_RGB_LINEAR,     /*< desc="RGB (linear)"     >*/
+  GIMP_LAYER_COLOR_SPACE_RGB_PERCEPTUAL, /*< desc="RGB (perceptual)" >*/
+  GIMP_LAYER_COLOR_SPACE_LAB,            /*< desc="LAB", pdb-skip    >*/
+} GimpLayerColorSpace;
+
+
+#define GIMP_TYPE_LAYER_COMPOSITE_MODE (gimp_layer_composite_mode_get_type ())
+
+GType gimp_layer_composite_mode_get_type (void) G_GNUC_CONST;
+
+typedef enum
+{
+  GIMP_LAYER_COMPOSITE_AUTO,             /*< desc="Auto"             >*/
+  GIMP_LAYER_COMPOSITE_UNION,            /*< desc="Union"            >*/
+  GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP, /*< desc="Clip to backdrop" >*/
+  GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER,    /*< desc="Clip to layer"    >*/
+  GIMP_LAYER_COMPOSITE_INTERSECTION      /*< desc="Intersection"     >*/
+} GimpLayerCompositeMode;
+
+
+#define GIMP_TYPE_LAYER_MODE (gimp_layer_mode_get_type ())
+
+GType gimp_layer_mode_get_type (void) G_GNUC_CONST;
+
+typedef enum
+{
+  /*  Modes that exist since ancient times  */
+  GIMP_LAYER_MODE_NORMAL_LEGACY,         /*< desc="Normal (legacy)",         abbrev="Normal (l)"            >*/
+  GIMP_LAYER_MODE_DISSOLVE,              /*< desc="Dissolve"                                                >*/
+  GIMP_LAYER_MODE_BEHIND_LEGACY,         /*< desc="Behind (legacy)",         abbrev="Behind (l)"            >*/
+  GIMP_LAYER_MODE_MULTIPLY_LEGACY,       /*< desc="Multiply (legacy)",       abbrev="Multiply (l)"          >*/
+  GIMP_LAYER_MODE_SCREEN_LEGACY,         /*< desc="Screen (legacy)",         abbrev="Screen (l)"            >*/
+  GIMP_LAYER_MODE_OVERLAY_LEGACY,        /*< desc="Old broken Overlay",      abbrev="Old Overlay"           >*/
+  GIMP_LAYER_MODE_DIFFERENCE_LEGACY,     /*< desc="Difference (legacy)",     abbrev="Difference (l)"        >*/
+  GIMP_LAYER_MODE_ADDITION_LEGACY,       /*< desc="Addition (legacy)",       abbrev="Addition (l)"          >*/
+  GIMP_LAYER_MODE_SUBTRACT_LEGACY,       /*< desc="Subtract (legacy)",       abbrev="Subtract (l)"          >*/
+  GIMP_LAYER_MODE_DARKEN_ONLY_LEGACY,    /*< desc="Darken only (legacy)",    abbrev="Darken only (l)"       >*/
+  GIMP_LAYER_MODE_LIGHTEN_ONLY_LEGACY,   /*< desc="Lighten only (legacy)",   abbrev="Lighten only (l)"      >*/
+  GIMP_LAYER_MODE_HSV_HUE_LEGACY,        /*< desc="HSV Hue (legacy)",        abbrev="HSV Hue (l)"           >*/
+  GIMP_LAYER_MODE_HSV_SATURATION_LEGACY, /*< desc="HSV Saturation (legacy)", abbrev="HSV Saturation (l)"    >*/
+  GIMP_LAYER_MODE_HSL_COLOR_LEGACY,      /*< desc="HSL Color (legacy)",      abbrev="HSL Color (l)"         >*/
+  GIMP_LAYER_MODE_HSV_VALUE_LEGACY,      /*< desc="HSV Value (legacy)",      abbrev="HSV Value (l)"         >*/
+  GIMP_LAYER_MODE_DIVIDE_LEGACY,         /*< desc="Divide (legacy)",         abbrev="Divide (l)"            >*/
+  GIMP_LAYER_MODE_DODGE_LEGACY,          /*< desc="Dodge (legacy)",          abbrev="Dodge (l)"             >*/
+  GIMP_LAYER_MODE_BURN_LEGACY,           /*< desc="Burn (legacy)",           abbrev="Burn (l)"              >*/
+  GIMP_LAYER_MODE_HARDLIGHT_LEGACY,      /*< desc="Hard light (legacy)",     abbrev="Hard light (l)"        >*/
+
+  /*  Since 2.8 (XCF version 2)  */
+  GIMP_LAYER_MODE_SOFTLIGHT_LEGACY,      /*< desc="Soft light (legacy)",     abbrev="Soft light (l)"        >*/
+  GIMP_LAYER_MODE_GRAIN_EXTRACT_LEGACY,  /*< desc="Grain extract (legacy)",  abbrev="Grain extract (l)"     >*/
+  GIMP_LAYER_MODE_GRAIN_MERGE_LEGACY,    /*< desc="Grain merge (legacy)",    abbrev="Grain merge (l)"       >*/
+  GIMP_LAYER_MODE_COLOR_ERASE_LEGACY,    /*< desc="Color erase (legacy)",    abbrev="Color erase (l)"       >*/
+
+  /*  Since 2.10 (XCF version 9) */
+  GIMP_LAYER_MODE_OVERLAY,               /*< desc="Overlay"                                                 >*/
+  GIMP_LAYER_MODE_LCH_HUE,               /*< desc="LCh Hue"                                                 >*/
+  GIMP_LAYER_MODE_LCH_CHROMA,            /*< desc="LCh Chroma"                                              >*/
+  GIMP_LAYER_MODE_LCH_COLOR,             /*< desc="LCh Color"                                               >*/
+  GIMP_LAYER_MODE_LCH_LIGHTNESS,         /*< desc="LCh Lightness"                                           >*/
+
+  /*  Since 2.10 (XCF version 10)  */
+  GIMP_LAYER_MODE_NORMAL,                /*< desc="Normal"                                                  >*/
+  GIMP_LAYER_MODE_BEHIND,                /*< desc="Behind"                                                  >*/
+  GIMP_LAYER_MODE_MULTIPLY,              /*< desc="Multiply"                                                >*/
+  GIMP_LAYER_MODE_SCREEN,                /*< desc="Screen"                                                  >*/
+  GIMP_LAYER_MODE_DIFFERENCE,            /*< desc="Difference"                                              >*/
+  GIMP_LAYER_MODE_ADDITION,              /*< desc="Addition"                                                >*/
+  GIMP_LAYER_MODE_SUBTRACT,              /*< desc="Subtract"                                                >*/
+  GIMP_LAYER_MODE_DARKEN_ONLY,           /*< desc="Darken only"                                             >*/
+  GIMP_LAYER_MODE_LIGHTEN_ONLY,          /*< desc="Lighten only"                                            >*/
+  GIMP_LAYER_MODE_HSV_HUE,               /*< desc="HSV Hue"                                                 >*/
+  GIMP_LAYER_MODE_HSV_SATURATION,        /*< desc="HSV Saturation"                                          >*/
+  GIMP_LAYER_MODE_HSL_COLOR,             /*< desc="HSL Color"                                               >*/
+  GIMP_LAYER_MODE_HSV_VALUE,             /*< desc="HSV Value"                                               >*/
+  GIMP_LAYER_MODE_DIVIDE,                /*< desc="Divide"                                                  >*/
+  GIMP_LAYER_MODE_DODGE,                 /*< desc="Dodge"                                                   >*/
+  GIMP_LAYER_MODE_BURN,                  /*< desc="Burn"                                                    >*/
+  GIMP_LAYER_MODE_HARDLIGHT,             /*< desc="Hard light"                                              >*/
+  GIMP_LAYER_MODE_SOFTLIGHT,             /*< desc="Soft light"                                              >*/
+  GIMP_LAYER_MODE_GRAIN_EXTRACT,         /*< desc="Grain extract"                                           >*/
+  GIMP_LAYER_MODE_GRAIN_MERGE,           /*< desc="Grain merge"                                             >*/
+  GIMP_LAYER_MODE_VIVID_LIGHT,           /*< desc="Vivid light"                                             >*/
+  GIMP_LAYER_MODE_PIN_LIGHT,             /*< desc="Pin light"                                               >*/
+  GIMP_LAYER_MODE_LINEAR_LIGHT,          /*< desc="Linear light"                                            >*/
+  GIMP_LAYER_MODE_HARD_MIX,              /*< desc="Hard mix"                                                >*/
+  GIMP_LAYER_MODE_EXCLUSION,             /*< desc="Exclusion"                                               >*/
+  GIMP_LAYER_MODE_LINEAR_BURN,           /*< desc="Linear burn"                                             >*/
+  GIMP_LAYER_MODE_LUMA_DARKEN_ONLY,      /*< desc="Luma/Luminance darken only",  abbrev="Luma darken only"  >*/
+  GIMP_LAYER_MODE_LUMA_LIGHTEN_ONLY,     /*< desc="Luma/Luminance lighten only", abbrev="Luma lighten only" >*/
+  GIMP_LAYER_MODE_LUMINANCE,             /*< desc="Luminance"                                               >*/
+  GIMP_LAYER_MODE_COLOR_ERASE,           /*< desc="Color erase"                                             >*/
+  GIMP_LAYER_MODE_ERASE,                 /*< desc="Erase"                                                   >*/
+  GIMP_LAYER_MODE_MERGE,                 /*< desc="Merge"                                                   >*/
+  GIMP_LAYER_MODE_SPLIT,                 /*< desc="Split"                                                   >*/
+  GIMP_LAYER_MODE_PASS_THROUGH,          /*< desc="Pass through"                                            >*/
+
+  /*  Internal modes, not available to the PDB, must be kept at the end  */
+  GIMP_LAYER_MODE_REPLACE,               /*< pdb-skip, desc="Replace"                                       >*/
+  GIMP_LAYER_MODE_ANTI_ERASE,            /*< pdb-skip, desc="Anti erase"                                    >*/
+
+  /*  Layer mode menu separator  */
+  GIMP_LAYER_MODE_SEPARATOR = -1         /*< pdb-skip, skip                                                 >*/
+} GimpLayerMode;
+
+
+#define GIMP_TYPE_LAYER_MODE_GROUP (gimp_layer_mode_group_get_type ())
+
+GType gimp_layer_mode_group_get_type (void) G_GNUC_CONST;
+
+typedef enum  /*< pdb-skip >*/
+{
+  GIMP_LAYER_MODE_GROUP_DEFAULT,     /*< desc="Default"      >*/
+  GIMP_LAYER_MODE_GROUP_LEGACY,      /*< desc="Legacy"       >*/
+} GimpLayerModeGroup;
+
+
+#define GIMP_TYPE_LAYER_MODE_CONTEXT (gimp_layer_mode_context_get_type ())
+
+GType gimp_layer_mode_context_get_type (void) G_GNUC_CONST;
+
+typedef enum  /*< pdb-skip >*/
+{
+  GIMP_LAYER_MODE_CONTEXT_LAYER  = 1 << 0,
+  GIMP_LAYER_MODE_CONTEXT_GROUP  = 1 << 1,
+  GIMP_LAYER_MODE_CONTEXT_PAINT  = 1 << 2,
+  GIMP_LAYER_MODE_CONTEXT_FILTER = 1 << 3,
+
+  GIMP_LAYER_MODE_CONTEXT_ALL = (GIMP_LAYER_MODE_CONTEXT_LAYER |
+                                 GIMP_LAYER_MODE_CONTEXT_GROUP |
+                                 GIMP_LAYER_MODE_CONTEXT_PAINT |
+                                 GIMP_LAYER_MODE_CONTEXT_FILTER)
+} GimpLayerModeContext;
+
+
+/*
+ * non-registered enums; register them if needed
+ */
+
+typedef enum  /*< pdb-skip, skip >*/
+{
+  GIMP_LAYER_COMPOSITE_REGION_INTERSECTION = 0,
+  GIMP_LAYER_COMPOSITE_REGION_DESTINATION  = 1 << 0,
+  GIMP_LAYER_COMPOSITE_REGION_SOURCE       = 1 << 1,
+  GIMP_LAYER_COMPOSITE_REGION_UNION        = (GIMP_LAYER_COMPOSITE_REGION_DESTINATION |
+                                              GIMP_LAYER_COMPOSITE_REGION_SOURCE),
+} GimpLayerCompositeRegion;
+
+typedef enum  /*< pdb-skip, skip >*/
+{
+  GIMP_LAYER_MODE_FLAG_LEGACY                    =  1 << 0,
+  GIMP_LAYER_MODE_FLAG_BLEND_SPACE_IMMUTABLE     =  1 << 1,
+  GIMP_LAYER_MODE_FLAG_COMPOSITE_SPACE_IMMUTABLE =  1 << 2,
+  GIMP_LAYER_MODE_FLAG_COMPOSITE_MODE_IMMUTABLE  =  1 << 3,
+  GIMP_LAYER_MODE_FLAG_SUBTRACTIVE               =  1 << 4,
+  GIMP_LAYER_MODE_FLAG_ALPHA_ONLY                =  1 << 5,
+  GIMP_LAYER_MODE_FLAG_TRIVIAL                   =  1 << 6
+} GimpLayerModeFlags;
+
+
+#endif /* __OPERATIONS_ENUMS_H__ */
diff --git a/app/operations/operations-types.h b/app/operations/operations-types.h
new file mode 100644
index 0000000..15e97d8
--- /dev/null
+++ b/app/operations/operations-types.h
@@ -0,0 +1,76 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * operations-types.h
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __OPERATIONS_TYPES_H__
+#define __OPERATIONS_TYPES_H__
+
+
+#include <gegl-types.h>
+
+#include "gegl/gimp-gegl-types.h"
+
+#include "operations-enums.h"
+
+
+/*  operations  */
+
+typedef struct _GimpOperationPointFilter        GimpOperationPointFilter;
+typedef struct _GimpOperationLayerMode          GimpOperationLayerMode;
+
+
+/*  operation config objects  */
+
+typedef struct _GimpOperationSettings           GimpOperationSettings;
+
+typedef struct _GimpBrightnessContrastConfig    GimpBrightnessContrastConfig;
+typedef struct _GimpCageConfig                  GimpCageConfig;
+typedef struct _GimpColorBalanceConfig          GimpColorBalanceConfig;
+typedef struct _GimpColorizeConfig              GimpColorizeConfig;
+typedef struct _GimpCurvesConfig                GimpCurvesConfig;
+typedef struct _GimpDesaturateConfig            GimpDesaturateConfig;
+typedef struct _GimpHueSaturationConfig         GimpHueSaturationConfig;
+typedef struct _GimpLevelsConfig                GimpLevelsConfig;
+typedef struct _GimpPosterizeConfig             GimpPosterizeConfig;
+typedef struct _GimpThresholdConfig             GimpThresholdConfig;
+
+
+/*  non-object types  */
+
+typedef struct _GimpCagePoint                   GimpCagePoint;
+
+
+/*  functions  */
+
+typedef gboolean (* GimpLayerModeFunc)      (GeglOperation          *operation,
+                                             void                   *in,
+                                             void                   *aux,
+                                             void                   *mask,
+                                             void                   *out,
+                                             glong                   samples,
+                                             const GeglRectangle    *roi,
+                                             gint                    level);
+
+typedef  void    (* GimpLayerModeBlendFunc) (GeglOperation          *operation,
+                                             const gfloat           *in,
+                                             const gfloat           *layer,
+                                             gfloat                 *out,
+                                             gint                    samples);
+
+
+#endif /* __OPERATIONS_TYPES_H__ */
diff --git a/app/operations/tests/Makefile.am b/app/operations/tests/Makefile.am
new file mode 100644
index 0000000..fdf0a9a
--- /dev/null
+++ b/app/operations/tests/Makefile.am
@@ -0,0 +1,71 @@
+#TESTS = test-operations
+
+EXTRA_PROGRAMS = $(TESTS)
+CLEANFILES = $(EXTRA_PROGRAMS)
+
+$(TESTS): output-dir
+
+libgimpbase = $(top_builddir)/libgimpbase/libgimpbase-$(GIMP_API_VERSION).la
+libgimpconfig = $(top_builddir)/libgimpconfig/libgimpconfig-$(GIMP_API_VERSION).la
+libgimpcolor = $(top_builddir)/libgimpcolor/libgimpcolor-$(GIMP_API_VERSION).la
+libgimpmath = $(top_builddir)/libgimpmath/libgimpmath-$(GIMP_API_VERSION).la
+libgimpmodule = $(top_builddir)/libgimpmodule/libgimpmodule-$(GIMP_API_VERSION).la
+libgimpwidgets = $(top_builddir)/libgimpwidgets/libgimpwidgets-$(GIMP_API_VERSION).la
+libgimpthumb = $(top_builddir)/libgimpthumb/libgimpthumb-$(GIMP_API_VERSION).la
+
+if OS_WIN32
+else
+libm = -lm
+endif
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)		\
+	-I$(top_srcdir)/app	\
+	$(GEGL_CFLAGS)		\
+	-I$(includedir)
+
+# We need this due to circular dependencies, see more detailed
+# comments about it in app/Makefile.am
+AM_LDFLAGS = \
+	-Wl,-u,$(SYMPREFIX)xcf_init				\
+	-Wl,-u,$(SYMPREFIX)internal_procs_init			\
+	-Wl,-u,$(SYMPREFIX)gimp_plug_in_manager_restore		\
+	-Wl,-u,$(SYMPREFIX)gimp_pdb_compat_param_spec		\
+	-Wl,-u,$(SYMPREFIX)gimp_vectors_undo_get_type		\
+	-Wl,-u,$(SYMPREFIX)gimp_vectors_mod_undo_get_type	\
+	-Wl,-u,$(SYMPREFIX)gimp_vectors_prop_undo_get_type
+
+# Note that we have some duplicate entries here too to work around
+# circular dependencies and systems on the same architectural layer as
+# an alternative to LDFLAGS above
+LDADD = \
+	$(top_builddir)/app/xcf/libappxcf.a			\
+	$(top_builddir)/app/pdb/libappinternal-procs.a		\
+	$(top_builddir)/app/pdb/libapppdb.a			\
+	$(top_builddir)/app/plug-in/libappplug-in.a		\
+	$(top_builddir)/app/vectors/libappvectors.a		\
+	$(top_builddir)/app/core/libappcore.a			\
+	$(top_builddir)/app/file/libappfile.a			\
+	$(top_builddir)/app/text/libapptext.a			\
+	$(top_builddir)/app/paint/libapppaint.a			\
+	$(top_builddir)/app/config/libappconfig.a		\
+	$(top_builddir)/app/libapp.a				\
+	$(top_builddir)/app/gegl/libappgegl.a			\
+	$(top_builddir)/app/operations/libappoperations.a	\
+	$(libgimpconfig)					\
+	$(libgimpmath)						\
+	$(libgimpthumb)						\
+	$(libgimpcolor)						\
+	$(libgimpmodule)					\
+	$(libgimpbase)						\
+	$(GDK_PIXBUF_LIBS)					\
+	$(PANGOCAIRO_LIBS)					\
+	$(GEGL_LIBS)						\
+	$(GLIB_LIBS)						\
+	$(libm)
+
+output-dir:
+	mkdir -p output
+
+clean-local:
+	rm -rf output
diff --git a/app/operations/tests/Makefile.in b/app/operations/tests/Makefile.in
new file mode 100644
index 0000000..cf57ae7
--- /dev/null
+++ b/app/operations/tests/Makefile.in
@@ -0,0 +1,814 @@
+# Makefile.in generated by automake 1.16.2 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#TESTS = test-operations
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
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+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+intltool__v_merge_options_ = @intltool__v_merge_options_@
+intltool__v_merge_options_0 = @intltool__v_merge_options_0@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+manpage_gimpdir = @manpage_gimpdir@
+mkdir_p = @mkdir_p@
+ms_librarian = @ms_librarian@
+mypaint_brushes_dir = @mypaint_brushes_dir@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+pkgpyexecdir = @pkgpyexecdir@
+pkgpythondir = @pkgpythondir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+pyexecdir = @pyexecdir@
+pythondir = @pythondir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+CLEANFILES = $(EXTRA_PROGRAMS)
+libgimpbase = $(top_builddir)/libgimpbase/libgimpbase-$(GIMP_API_VERSION).la
+libgimpconfig = $(top_builddir)/libgimpconfig/libgimpconfig-$(GIMP_API_VERSION).la
+libgimpcolor = $(top_builddir)/libgimpcolor/libgimpcolor-$(GIMP_API_VERSION).la
+libgimpmath = $(top_builddir)/libgimpmath/libgimpmath-$(GIMP_API_VERSION).la
+libgimpmodule = $(top_builddir)/libgimpmodule/libgimpmodule-$(GIMP_API_VERSION).la
+libgimpwidgets = $(top_builddir)/libgimpwidgets/libgimpwidgets-$(GIMP_API_VERSION).la
+libgimpthumb = $(top_builddir)/libgimpthumb/libgimpthumb-$(GIMP_API_VERSION).la
+@OS_WIN32_FALSE@libm = -lm
+AM_CPPFLAGS = \
+	-I$(top_srcdir)		\
+	-I$(top_srcdir)/app	\
+	$(GEGL_CFLAGS)		\
+	-I$(includedir)
+
+
+# We need this due to circular dependencies, see more detailed
+# comments about it in app/Makefile.am
+AM_LDFLAGS = \
+	-Wl,-u,$(SYMPREFIX)xcf_init				\
+	-Wl,-u,$(SYMPREFIX)internal_procs_init			\
+	-Wl,-u,$(SYMPREFIX)gimp_plug_in_manager_restore		\
+	-Wl,-u,$(SYMPREFIX)gimp_pdb_compat_param_spec		\
+	-Wl,-u,$(SYMPREFIX)gimp_vectors_undo_get_type		\
+	-Wl,-u,$(SYMPREFIX)gimp_vectors_mod_undo_get_type	\
+	-Wl,-u,$(SYMPREFIX)gimp_vectors_prop_undo_get_type
+
+
+# Note that we have some duplicate entries here too to work around
+# circular dependencies and systems on the same architectural layer as
+# an alternative to LDFLAGS above
+LDADD = \
+	$(top_builddir)/app/xcf/libappxcf.a			\
+	$(top_builddir)/app/pdb/libappinternal-procs.a		\
+	$(top_builddir)/app/pdb/libapppdb.a			\
+	$(top_builddir)/app/plug-in/libappplug-in.a		\
+	$(top_builddir)/app/vectors/libappvectors.a		\
+	$(top_builddir)/app/core/libappcore.a			\
+	$(top_builddir)/app/file/libappfile.a			\
+	$(top_builddir)/app/text/libapptext.a			\
+	$(top_builddir)/app/paint/libapppaint.a			\
+	$(top_builddir)/app/config/libappconfig.a		\
+	$(top_builddir)/app/libapp.a				\
+	$(top_builddir)/app/gegl/libappgegl.a			\
+	$(top_builddir)/app/operations/libappoperations.a	\
+	$(libgimpconfig)					\
+	$(libgimpmath)						\
+	$(libgimpthumb)						\
+	$(libgimpcolor)						\
+	$(libgimpmodule)					\
+	$(libgimpbase)						\
+	$(GDK_PIXBUF_LIBS)					\
+	$(PANGOCAIRO_LIBS)					\
+	$(GEGL_LIBS)						\
+	$(GLIB_LIBS)						\
+	$(libm)
+
+all: all-am
+
+.SUFFIXES:
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu app/operations/tests/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu app/operations/tests/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-local mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	clean-local cscopelist-am ctags-am distclean distclean-generic \
+	distclean-libtool distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+$(TESTS): output-dir
+
+output-dir:
+	mkdir -p output
+
+clean-local:
+	rm -rf output
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT: