Adding upstream version 2.10.34.upstream/2.10.34upstream

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

47 files changed, 8113 insertions, 0 deletions

diff --git a/app/propgui/Makefile.am b/app/propgui/Makefile.am
new file mode 100644
index 0000000..0f64ee7
--- /dev/null
+++ b/app/propgui/Makefile.am
@@ -0,0 +1,63 @@
+## Process this file with automake to produce Makefile.in
+
+AM_CPPFLAGS = \
+        -DISO_CODES_LOCATION=\"$(ISO_CODES_LOCATION)\"		\
+        -DISO_CODES_LOCALEDIR=\"$(ISO_CODES_LOCALEDIR)\"	\
+	-DG_LOG_DOMAIN=\"Gimp-PropGUI\"				\
+	-I$(top_builddir)					\
+	-I$(top_srcdir)						\
+	-I$(top_builddir)/app					\
+	-I$(top_srcdir)/app					\
+	$(GEGL_CFLAGS)						\
+	$(GTK_CFLAGS)						\
+	-I$(includedir)
+
+noinst_LIBRARIES = libapppropgui.a
+
+libapppropgui_a_SOURCES = \
+	propgui-types.h				\
+	\
+	gimppropgui.c				\
+	gimppropgui.h				\
+	gimppropgui-channel-mixer.c		\
+	gimppropgui-channel-mixer.h		\
+	gimppropgui-color-balance.c		\
+	gimppropgui-color-balance.h		\
+	gimppropgui-color-rotate.c		\
+	gimppropgui-color-rotate.h		\
+	gimppropgui-color-to-alpha.c		\
+	gimppropgui-color-to-alpha.h		\
+	gimppropgui-convolution-matrix.c	\
+	gimppropgui-convolution-matrix.h	\
+	gimppropgui-diffraction-patterns.c	\
+	gimppropgui-diffraction-patterns.h	\
+	gimppropgui-eval.c			\
+	gimppropgui-eval.h			\
+	gimppropgui-focus-blur.c		\
+	gimppropgui-focus-blur.h		\
+	gimppropgui-generic.c			\
+	gimppropgui-generic.h			\
+	gimppropgui-hue-saturation.c		\
+	gimppropgui-hue-saturation.h		\
+	gimppropgui-motion-blur-circular.c	\
+	gimppropgui-motion-blur-circular.h	\
+	gimppropgui-motion-blur-linear.c	\
+	gimppropgui-motion-blur-linear.h	\
+	gimppropgui-motion-blur-zoom.c		\
+	gimppropgui-motion-blur-zoom.h		\
+	gimppropgui-newsprint.c			\
+	gimppropgui-newsprint.h			\
+	gimppropgui-panorama-projection.c	\
+	gimppropgui-panorama-projection.h	\
+	gimppropgui-recursive-transform.c	\
+	gimppropgui-recursive-transform.h	\
+	gimppropgui-shadows-highlights.c	\
+	gimppropgui-shadows-highlights.h	\
+	gimppropgui-spiral.c			\
+	gimppropgui-spiral.h			\
+	gimppropgui-supernova.c			\
+	gimppropgui-supernova.h			\
+	gimppropgui-utils.c			\
+	gimppropgui-utils.h			\
+	gimppropgui-vignette.c			\
+	gimppropgui-vignette.h
diff --git a/app/propgui/Makefile.in b/app/propgui/Makefile.in
new file mode 100644
index 0000000..04ce120
--- /dev/null
+++ b/app/propgui/Makefile.in
@@ -0,0 +1,1061 @@
+# Makefile.in generated by automake 1.16.3 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; \
+}
+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=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+subdir = app/propgui
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/acinclude.m4 \
+	$(top_srcdir)/m4macros/alsa.m4 \
+	$(top_srcdir)/m4macros/ax_compare_version.m4 \
+	$(top_srcdir)/m4macros/ax_cxx_compile_stdcxx.m4 \
+	$(top_srcdir)/m4macros/ax_gcc_func_attribute.m4 \
+	$(top_srcdir)/m4macros/ax_prog_cc_for_build.m4 \
+	$(top_srcdir)/m4macros/ax_prog_perl_version.m4 \
+	$(top_srcdir)/m4macros/detectcflags.m4 \
+	$(top_srcdir)/m4macros/pythondev.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/config.h
+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
+LIBRARIES = $(noinst_LIBRARIES)
+ARFLAGS = cru
+AM_V_AR = $(am__v_AR_@AM_V@)
+am__v_AR_ = $(am__v_AR_@AM_DEFAULT_V@)
+am__v_AR_0 = @echo "  AR      " $@;
+am__v_AR_1 = 
+libapppropgui_a_AR = $(AR) $(ARFLAGS)
+libapppropgui_a_LIBADD =
+am_libapppropgui_a_OBJECTS = gimppropgui.$(OBJEXT) \
+	gimppropgui-channel-mixer.$(OBJEXT) \
+	gimppropgui-color-balance.$(OBJEXT) \
+	gimppropgui-color-rotate.$(OBJEXT) \
+	gimppropgui-color-to-alpha.$(OBJEXT) \
+	gimppropgui-convolution-matrix.$(OBJEXT) \
+	gimppropgui-diffraction-patterns.$(OBJEXT) \
+	gimppropgui-eval.$(OBJEXT) gimppropgui-focus-blur.$(OBJEXT) \
+	gimppropgui-generic.$(OBJEXT) \
+	gimppropgui-hue-saturation.$(OBJEXT) \
+	gimppropgui-motion-blur-circular.$(OBJEXT) \
+	gimppropgui-motion-blur-linear.$(OBJEXT) \
+	gimppropgui-motion-blur-zoom.$(OBJEXT) \
+	gimppropgui-newsprint.$(OBJEXT) \
+	gimppropgui-panorama-projection.$(OBJEXT) \
+	gimppropgui-recursive-transform.$(OBJEXT) \
+	gimppropgui-shadows-highlights.$(OBJEXT) \
+	gimppropgui-spiral.$(OBJEXT) gimppropgui-supernova.$(OBJEXT) \
+	gimppropgui-utils.$(OBJEXT) gimppropgui-vignette.$(OBJEXT)
+libapppropgui_a_OBJECTS = $(am_libapppropgui_a_OBJECTS)
+AM_V_P = $(am__v_P_@AM_V@)
+am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)
+am__v_P_0 = false
+am__v_P_1 = :
+AM_V_GEN = $(am__v_GEN_@AM_V@)
+am__v_GEN_ = $(am__v_GEN_@AM_DEFAULT_V@)
+am__v_GEN_0 = @echo "  GEN     " $@;
+am__v_GEN_1 = 
+AM_V_at = $(am__v_at_@AM_V@)
+am__v_at_ = $(am__v_at_@AM_DEFAULT_V@)
+am__v_at_0 = @
+am__v_at_1 = 
+DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
+depcomp = $(SHELL) $(top_srcdir)/depcomp
+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/gimppropgui-channel-mixer.Po \
+	./$(DEPDIR)/gimppropgui-color-balance.Po \
+	./$(DEPDIR)/gimppropgui-color-rotate.Po \
+	./$(DEPDIR)/gimppropgui-color-to-alpha.Po \
+	./$(DEPDIR)/gimppropgui-convolution-matrix.Po \
+	./$(DEPDIR)/gimppropgui-diffraction-patterns.Po \
+	./$(DEPDIR)/gimppropgui-eval.Po \
+	./$(DEPDIR)/gimppropgui-focus-blur.Po \
+	./$(DEPDIR)/gimppropgui-generic.Po \
+	./$(DEPDIR)/gimppropgui-hue-saturation.Po \
+	./$(DEPDIR)/gimppropgui-motion-blur-circular.Po \
+	./$(DEPDIR)/gimppropgui-motion-blur-linear.Po \
+	./$(DEPDIR)/gimppropgui-motion-blur-zoom.Po \
+	./$(DEPDIR)/gimppropgui-newsprint.Po \
+	./$(DEPDIR)/gimppropgui-panorama-projection.Po \
+	./$(DEPDIR)/gimppropgui-recursive-transform.Po \
+	./$(DEPDIR)/gimppropgui-shadows-highlights.Po \
+	./$(DEPDIR)/gimppropgui-spiral.Po \
+	./$(DEPDIR)/gimppropgui-supernova.Po \
+	./$(DEPDIR)/gimppropgui-utils.Po \
+	./$(DEPDIR)/gimppropgui-vignette.Po ./$(DEPDIR)/gimppropgui.Po
+am__mv = mv -f
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+AM_V_lt = $(am__v_lt_@AM_V@)
+am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
+am__v_lt_0 = --silent
+am__v_lt_1 = 
+LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CFLAGS) $(CFLAGS)
+AM_V_CC = $(am__v_CC_@AM_V@)
+am__v_CC_ = $(am__v_CC_@AM_DEFAULT_V@)
+am__v_CC_0 = @echo "  CC      " $@;
+am__v_CC_1 = 
+CCLD = $(CC)
+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CCLD = $(am__v_CCLD_@AM_V@)
+am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
+am__v_CCLD_0 = @echo "  CCLD    " $@;
+am__v_CCLD_1 = 
+SOURCES = $(libapppropgui_a_SOURCES)
+DIST_SOURCES = $(libapppropgui_a_SOURCES)
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
+    *) (install-info --version) >/dev/null 2>&1;; \
+  esac
+am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) $(LISP)
+# Read a list of newline-separated strings from the standard input,
+# and print each of them once, without duplicates.  Input order is
+# *not* preserved.
+am__uniquify_input = $(AWK) '\
+  BEGIN { nonempty = 0; } \
+  { items[$$0] = 1; nonempty = 1; } \
+  END { if (nonempty) { for (i in items) print i; }; } \
+'
+# Make sure the list of sources is unique.  This is necessary because,
+# e.g., the same source file might be shared among _SOURCES variables
+# for different programs/libraries.
+am__define_uniq_tagged_files = \
+  list='$(am__tagged_files)'; \
+  unique=`for i in $$list; do \
+    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+  done | $(am__uniquify_input)`
+ETAGS = etags
+CTAGS = ctags
+am__DIST_COMMON = $(srcdir)/Makefile.in $(top_srcdir)/depcomp
+DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
+AA_LIBS = @AA_LIBS@
+ACLOCAL = @ACLOCAL@
+ALLOCA = @ALLOCA@
+ALL_LINGUAS = @ALL_LINGUAS@
+ALSA_CFLAGS = @ALSA_CFLAGS@
+ALSA_LIBS = @ALSA_LIBS@
+ALTIVEC_EXTRA_CFLAGS = @ALTIVEC_EXTRA_CFLAGS@
+AMTAR = @AMTAR@
+AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
+APPSTREAM_UTIL = @APPSTREAM_UTIL@
+AR = @AR@
+AS = @AS@
+ATK_CFLAGS = @ATK_CFLAGS@
+ATK_LIBS = @ATK_LIBS@
+ATK_REQUIRED_VERSION = @ATK_REQUIRED_VERSION@
+AUTOCONF = @AUTOCONF@
+AUTOHEADER = @AUTOHEADER@
+AUTOMAKE = @AUTOMAKE@
+AWK = @AWK@
+BABL_CFLAGS = @BABL_CFLAGS@
+BABL_LIBS = @BABL_LIBS@
+BABL_REQUIRED_VERSION = @BABL_REQUIRED_VERSION@
+BUG_REPORT_URL = @BUG_REPORT_URL@
+BUILD_EXEEXT = @BUILD_EXEEXT@
+BUILD_OBJEXT = @BUILD_OBJEXT@
+BZIP2_LIBS = @BZIP2_LIBS@
+CAIRO_CFLAGS = @CAIRO_CFLAGS@
+CAIRO_LIBS = @CAIRO_LIBS@
+CAIRO_PDF_CFLAGS = @CAIRO_PDF_CFLAGS@
+CAIRO_PDF_LIBS = @CAIRO_PDF_LIBS@
+CAIRO_PDF_REQUIRED_VERSION = @CAIRO_PDF_REQUIRED_VERSION@
+CAIRO_REQUIRED_VERSION = @CAIRO_REQUIRED_VERSION@
+CATALOGS = @CATALOGS@
+CATOBJEXT = @CATOBJEXT@
+CC = @CC@
+CCAS = @CCAS@
+CCASDEPMODE = @CCASDEPMODE@
+CCASFLAGS = @CCASFLAGS@
+CCDEPMODE = @CCDEPMODE@
+CC_FOR_BUILD = @CC_FOR_BUILD@
+CC_VERSION = @CC_VERSION@
+CFLAGS = @CFLAGS@
+CFLAGS_FOR_BUILD = @CFLAGS_FOR_BUILD@
+CPP = @CPP@
+CPPFLAGS = @CPPFLAGS@
+CPPFLAGS_FOR_BUILD = @CPPFLAGS_FOR_BUILD@
+CPP_FOR_BUILD = @CPP_FOR_BUILD@
+CXX = @CXX@
+CXXCPP = @CXXCPP@
+CXXDEPMODE = @CXXDEPMODE@
+CXXFLAGS = @CXXFLAGS@
+CYGPATH_W = @CYGPATH_W@
+DATADIRNAME = @DATADIRNAME@
+DEFS = @DEFS@
+DEPDIR = @DEPDIR@
+DESKTOP_DATADIR = @DESKTOP_DATADIR@
+DESKTOP_FILE_VALIDATE = @DESKTOP_FILE_VALIDATE@
+DLLTOOL = @DLLTOOL@
+DOC_SHOOTER = @DOC_SHOOTER@
+DSYMUTIL = @DSYMUTIL@
+DUMPBIN = @DUMPBIN@
+ECHO_C = @ECHO_C@
+ECHO_N = @ECHO_N@
+ECHO_T = @ECHO_T@
+EGREP = @EGREP@
+EXEEXT = @EXEEXT@
+FGREP = @FGREP@
+FILE_AA = @FILE_AA@
+FILE_EXR = @FILE_EXR@
+FILE_HEIF = @FILE_HEIF@
+FILE_JP2_LOAD = @FILE_JP2_LOAD@
+FILE_JPEGXL = @FILE_JPEGXL@
+FILE_MNG = @FILE_MNG@
+FILE_PDF_SAVE = @FILE_PDF_SAVE@
+FILE_PS = @FILE_PS@
+FILE_WMF = @FILE_WMF@
+FILE_XMC = @FILE_XMC@
+FILE_XPM = @FILE_XPM@
+FONTCONFIG_CFLAGS = @FONTCONFIG_CFLAGS@
+FONTCONFIG_LIBS = @FONTCONFIG_LIBS@
+FONTCONFIG_REQUIRED_VERSION = @FONTCONFIG_REQUIRED_VERSION@
+FREETYPE2_REQUIRED_VERSION = @FREETYPE2_REQUIRED_VERSION@
+FREETYPE_CFLAGS = @FREETYPE_CFLAGS@
+FREETYPE_LIBS = @FREETYPE_LIBS@
+GDBUS_CODEGEN = @GDBUS_CODEGEN@
+GDK_PIXBUF_CFLAGS = @GDK_PIXBUF_CFLAGS@
+GDK_PIXBUF_CSOURCE = @GDK_PIXBUF_CSOURCE@
+GDK_PIXBUF_LIBS = @GDK_PIXBUF_LIBS@
+GDK_PIXBUF_REQUIRED_VERSION = @GDK_PIXBUF_REQUIRED_VERSION@
+GEGL = @GEGL@
+GEGL_CFLAGS = @GEGL_CFLAGS@
+GEGL_LIBS = @GEGL_LIBS@
+GEGL_MAJOR_MINOR_VERSION = @GEGL_MAJOR_MINOR_VERSION@
+GEGL_REQUIRED_VERSION = @GEGL_REQUIRED_VERSION@
+GETTEXT_PACKAGE = @GETTEXT_PACKAGE@
+GEXIV2_CFLAGS = @GEXIV2_CFLAGS@
+GEXIV2_LIBS = @GEXIV2_LIBS@
+GEXIV2_REQUIRED_VERSION = @GEXIV2_REQUIRED_VERSION@
+GIMP_API_VERSION = @GIMP_API_VERSION@
+GIMP_APP_VERSION = @GIMP_APP_VERSION@
+GIMP_BINARY_AGE = @GIMP_BINARY_AGE@
+GIMP_COMMAND = @GIMP_COMMAND@
+GIMP_DATA_VERSION = @GIMP_DATA_VERSION@
+GIMP_FULL_NAME = @GIMP_FULL_NAME@
+GIMP_INTERFACE_AGE = @GIMP_INTERFACE_AGE@
+GIMP_MAJOR_VERSION = @GIMP_MAJOR_VERSION@
+GIMP_MICRO_VERSION = @GIMP_MICRO_VERSION@
+GIMP_MINOR_VERSION = @GIMP_MINOR_VERSION@
+GIMP_MKENUMS = @GIMP_MKENUMS@
+GIMP_MODULES = @GIMP_MODULES@
+GIMP_PACKAGE_REVISION = @GIMP_PACKAGE_REVISION@
+GIMP_PKGCONFIG_VERSION = @GIMP_PKGCONFIG_VERSION@
+GIMP_PLUGINS = @GIMP_PLUGINS@
+GIMP_PLUGIN_VERSION = @GIMP_PLUGIN_VERSION@
+GIMP_REAL_VERSION = @GIMP_REAL_VERSION@
+GIMP_RELEASE = @GIMP_RELEASE@
+GIMP_SYSCONF_VERSION = @GIMP_SYSCONF_VERSION@
+GIMP_TOOL_VERSION = @GIMP_TOOL_VERSION@
+GIMP_UNSTABLE = @GIMP_UNSTABLE@
+GIMP_USER_VERSION = @GIMP_USER_VERSION@
+GIMP_VERSION = @GIMP_VERSION@
+GIO_CFLAGS = @GIO_CFLAGS@
+GIO_LIBS = @GIO_LIBS@
+GIO_UNIX_CFLAGS = @GIO_UNIX_CFLAGS@
+GIO_UNIX_LIBS = @GIO_UNIX_LIBS@
+GIO_WINDOWS_CFLAGS = @GIO_WINDOWS_CFLAGS@
+GIO_WINDOWS_LIBS = @GIO_WINDOWS_LIBS@
+GLIB_CFLAGS = @GLIB_CFLAGS@
+GLIB_COMPILE_RESOURCES = @GLIB_COMPILE_RESOURCES@
+GLIB_GENMARSHAL = @GLIB_GENMARSHAL@
+GLIB_LIBS = @GLIB_LIBS@
+GLIB_MKENUMS = @GLIB_MKENUMS@
+GLIB_REQUIRED_VERSION = @GLIB_REQUIRED_VERSION@
+GMODULE_NO_EXPORT_CFLAGS = @GMODULE_NO_EXPORT_CFLAGS@
+GMODULE_NO_EXPORT_LIBS = @GMODULE_NO_EXPORT_LIBS@
+GMOFILES = @GMOFILES@
+GMSGFMT = @GMSGFMT@
+GOBJECT_QUERY = @GOBJECT_QUERY@
+GREP = @GREP@
+GS_LIBS = @GS_LIBS@
+GTKDOC_CHECK = @GTKDOC_CHECK@
+GTKDOC_CHECK_PATH = @GTKDOC_CHECK_PATH@
+GTKDOC_DEPS_CFLAGS = @GTKDOC_DEPS_CFLAGS@
+GTKDOC_DEPS_LIBS = @GTKDOC_DEPS_LIBS@
+GTKDOC_MKPDF = @GTKDOC_MKPDF@
+GTKDOC_REBASE = @GTKDOC_REBASE@
+GTK_CFLAGS = @GTK_CFLAGS@
+GTK_LIBS = @GTK_LIBS@
+GTK_MAC_INTEGRATION_CFLAGS = @GTK_MAC_INTEGRATION_CFLAGS@
+GTK_MAC_INTEGRATION_LIBS = @GTK_MAC_INTEGRATION_LIBS@
+GTK_REQUIRED_VERSION = @GTK_REQUIRED_VERSION@
+GTK_UPDATE_ICON_CACHE = @GTK_UPDATE_ICON_CACHE@
+GUDEV_CFLAGS = @GUDEV_CFLAGS@
+GUDEV_LIBS = @GUDEV_LIBS@
+HARFBUZZ_CFLAGS = @HARFBUZZ_CFLAGS@
+HARFBUZZ_LIBS = @HARFBUZZ_LIBS@
+HARFBUZZ_REQUIRED_VERSION = @HARFBUZZ_REQUIRED_VERSION@
+HAVE_CXX14 = @HAVE_CXX14@
+HAVE_FINITE = @HAVE_FINITE@
+HAVE_ISFINITE = @HAVE_ISFINITE@
+HAVE_VFORK = @HAVE_VFORK@
+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@
+INTLLIBS = @INTLLIBS@
+INTLTOOL_EXTRACT = @INTLTOOL_EXTRACT@
+INTLTOOL_MERGE = @INTLTOOL_MERGE@
+INTLTOOL_PERL = @INTLTOOL_PERL@
+INTLTOOL_REQUIRED_VERSION = @INTLTOOL_REQUIRED_VERSION@
+INTLTOOL_UPDATE = @INTLTOOL_UPDATE@
+INTLTOOL_V_MERGE = @INTLTOOL_V_MERGE@
+INTLTOOL_V_MERGE_OPTIONS = @INTLTOOL_V_MERGE_OPTIONS@
+INTLTOOL__v_MERGE_ = @INTLTOOL__v_MERGE_@
+INTLTOOL__v_MERGE_0 = @INTLTOOL__v_MERGE_0@
+INTL_MACOSX_LIBS = @INTL_MACOSX_LIBS@
+ISO_CODES_LOCALEDIR = @ISO_CODES_LOCALEDIR@
+ISO_CODES_LOCATION = @ISO_CODES_LOCATION@
+JPEG_LIBS = @JPEG_LIBS@
+JSON_GLIB_CFLAGS = @JSON_GLIB_CFLAGS@
+JSON_GLIB_LIBS = @JSON_GLIB_LIBS@
+JXL_CFLAGS = @JXL_CFLAGS@
+JXL_LIBS = @JXL_LIBS@
+JXL_THREADS_CFLAGS = @JXL_THREADS_CFLAGS@
+JXL_THREADS_LIBS = @JXL_THREADS_LIBS@
+LCMS_CFLAGS = @LCMS_CFLAGS@
+LCMS_LIBS = @LCMS_LIBS@
+LCMS_REQUIRED_VERSION = @LCMS_REQUIRED_VERSION@
+LD = @LD@
+LDFLAGS = @LDFLAGS@
+LDFLAGS_FOR_BUILD = @LDFLAGS_FOR_BUILD@
+LIBBACKTRACE_LIBS = @LIBBACKTRACE_LIBS@
+LIBHEIF_CFLAGS = @LIBHEIF_CFLAGS@
+LIBHEIF_LIBS = @LIBHEIF_LIBS@
+LIBHEIF_REQUIRED_VERSION = @LIBHEIF_REQUIRED_VERSION@
+LIBJXL_REQUIRED_VERSION = @LIBJXL_REQUIRED_VERSION@
+LIBLZMA_REQUIRED_VERSION = @LIBLZMA_REQUIRED_VERSION@
+LIBMYPAINT_CFLAGS = @LIBMYPAINT_CFLAGS@
+LIBMYPAINT_LIBS = @LIBMYPAINT_LIBS@
+LIBMYPAINT_REQUIRED_VERSION = @LIBMYPAINT_REQUIRED_VERSION@
+LIBOBJS = @LIBOBJS@
+LIBPNG_REQUIRED_VERSION = @LIBPNG_REQUIRED_VERSION@
+LIBS = @LIBS@
+LIBTOOL = @LIBTOOL@
+LIBUNWIND_CFLAGS = @LIBUNWIND_CFLAGS@
+LIBUNWIND_LIBS = @LIBUNWIND_LIBS@
+LIBUNWIND_REQUIRED_VERSION = @LIBUNWIND_REQUIRED_VERSION@
+LIPO = @LIPO@
+LN_S = @LN_S@
+LTLIBOBJS = @LTLIBOBJS@
+LT_CURRENT_MINUS_AGE = @LT_CURRENT_MINUS_AGE@
+LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
+LT_VERSION_INFO = @LT_VERSION_INFO@
+LZMA_CFLAGS = @LZMA_CFLAGS@
+LZMA_LIBS = @LZMA_LIBS@
+MAIL = @MAIL@
+MAINT = @MAINT@
+MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
+MIME_INFO_CFLAGS = @MIME_INFO_CFLAGS@
+MIME_INFO_LIBS = @MIME_INFO_LIBS@
+MIME_TYPES = @MIME_TYPES@
+MKDIR_P = @MKDIR_P@
+MKINSTALLDIRS = @MKINSTALLDIRS@
+MMX_EXTRA_CFLAGS = @MMX_EXTRA_CFLAGS@
+MNG_CFLAGS = @MNG_CFLAGS@
+MNG_LIBS = @MNG_LIBS@
+MSGFMT = @MSGFMT@
+MSGFMT_OPTS = @MSGFMT_OPTS@
+MSGMERGE = @MSGMERGE@
+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@
+PERL = @PERL@
+PERL_REQUIRED_VERSION = @PERL_REQUIRED_VERSION@
+PERL_VERSION = @PERL_VERSION@
+PKG_CONFIG = @PKG_CONFIG@
+PKG_CONFIG_LIBDIR = @PKG_CONFIG_LIBDIR@
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+PNG_CFLAGS = @PNG_CFLAGS@
+PNG_LIBS = @PNG_LIBS@
+POFILES = @POFILES@
+POPPLER_CFLAGS = @POPPLER_CFLAGS@
+POPPLER_DATA_CFLAGS = @POPPLER_DATA_CFLAGS@
+POPPLER_DATA_LIBS = @POPPLER_DATA_LIBS@
+POPPLER_DATA_REQUIRED_VERSION = @POPPLER_DATA_REQUIRED_VERSION@
+POPPLER_LIBS = @POPPLER_LIBS@
+POPPLER_REQUIRED_VERSION = @POPPLER_REQUIRED_VERSION@
+POSUB = @POSUB@
+PO_IN_DATADIR_FALSE = @PO_IN_DATADIR_FALSE@
+PO_IN_DATADIR_TRUE = @PO_IN_DATADIR_TRUE@
+PYBIN_PATH = @PYBIN_PATH@
+PYCAIRO_CFLAGS = @PYCAIRO_CFLAGS@
+PYCAIRO_LIBS = @PYCAIRO_LIBS@
+PYGIMP_EXTRA_CFLAGS = @PYGIMP_EXTRA_CFLAGS@
+PYGTK_CFLAGS = @PYGTK_CFLAGS@
+PYGTK_CODEGEN = @PYGTK_CODEGEN@
+PYGTK_DEFSDIR = @PYGTK_DEFSDIR@
+PYGTK_LIBS = @PYGTK_LIBS@
+PYLINK_LIBS = @PYLINK_LIBS@
+PYTHON = @PYTHON@
+PYTHON2_REQUIRED_VERSION = @PYTHON2_REQUIRED_VERSION@
+PYTHON_EXEC_PREFIX = @PYTHON_EXEC_PREFIX@
+PYTHON_INCLUDES = @PYTHON_INCLUDES@
+PYTHON_PLATFORM = @PYTHON_PLATFORM@
+PYTHON_PREFIX = @PYTHON_PREFIX@
+PYTHON_VERSION = @PYTHON_VERSION@
+RANLIB = @RANLIB@
+RSVG_REQUIRED_VERSION = @RSVG_REQUIRED_VERSION@
+RT_LIBS = @RT_LIBS@
+SCREENSHOT_LIBS = @SCREENSHOT_LIBS@
+SED = @SED@
+SENDMAIL = @SENDMAIL@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SOCKET_LIBS = @SOCKET_LIBS@
+SSE2_EXTRA_CFLAGS = @SSE2_EXTRA_CFLAGS@
+SSE4_1_EXTRA_CFLAGS = @SSE4_1_EXTRA_CFLAGS@
+SSE_EXTRA_CFLAGS = @SSE_EXTRA_CFLAGS@
+STRIP = @STRIP@
+SVG_CFLAGS = @SVG_CFLAGS@
+SVG_LIBS = @SVG_LIBS@
+SYMPREFIX = @SYMPREFIX@
+TIFF_LIBS = @TIFF_LIBS@
+USE_NLS = @USE_NLS@
+VERSION = @VERSION@
+WEBKIT_CFLAGS = @WEBKIT_CFLAGS@
+WEBKIT_LIBS = @WEBKIT_LIBS@
+WEBKIT_REQUIRED_VERSION = @WEBKIT_REQUIRED_VERSION@
+WEBPDEMUX_CFLAGS = @WEBPDEMUX_CFLAGS@
+WEBPDEMUX_LIBS = @WEBPDEMUX_LIBS@
+WEBPMUX_CFLAGS = @WEBPMUX_CFLAGS@
+WEBPMUX_LIBS = @WEBPMUX_LIBS@
+WEBP_CFLAGS = @WEBP_CFLAGS@
+WEBP_LIBS = @WEBP_LIBS@
+WEBP_REQUIRED_VERSION = @WEBP_REQUIRED_VERSION@
+WEB_PAGE = @WEB_PAGE@
+WIN32_LARGE_ADDRESS_AWARE = @WIN32_LARGE_ADDRESS_AWARE@
+WINDRES = @WINDRES@
+WMF_CFLAGS = @WMF_CFLAGS@
+WMF_CONFIG = @WMF_CONFIG@
+WMF_LIBS = @WMF_LIBS@
+WMF_REQUIRED_VERSION = @WMF_REQUIRED_VERSION@
+XDG_EMAIL = @XDG_EMAIL@
+XFIXES_CFLAGS = @XFIXES_CFLAGS@
+XFIXES_LIBS = @XFIXES_LIBS@
+XGETTEXT = @XGETTEXT@
+XGETTEXT_REQUIRED_VERSION = @XGETTEXT_REQUIRED_VERSION@
+XMC_CFLAGS = @XMC_CFLAGS@
+XMC_LIBS = @XMC_LIBS@
+XMKMF = @XMKMF@
+XMLLINT = @XMLLINT@
+XMU_LIBS = @XMU_LIBS@
+XPM_LIBS = @XPM_LIBS@
+XSLTPROC = @XSLTPROC@
+XVFB_RUN = @XVFB_RUN@
+X_CFLAGS = @X_CFLAGS@
+X_EXTRA_LIBS = @X_EXTRA_LIBS@
+X_LIBS = @X_LIBS@
+X_PRE_LIBS = @X_PRE_LIBS@
+Z_LIBS = @Z_LIBS@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_CC_FOR_BUILD = @ac_ct_CC_FOR_BUILD@
+ac_ct_CXX = @ac_ct_CXX@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+gimpdatadir = @gimpdatadir@
+gimpdir = @gimpdir@
+gimplocaledir = @gimplocaledir@
+gimpplugindir = @gimpplugindir@
+gimpsysconfdir = @gimpsysconfdir@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+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@
+AM_CPPFLAGS = \
+        -DISO_CODES_LOCATION=\"$(ISO_CODES_LOCATION)\"		\
+        -DISO_CODES_LOCALEDIR=\"$(ISO_CODES_LOCALEDIR)\"	\
+	-DG_LOG_DOMAIN=\"Gimp-PropGUI\"				\
+	-I$(top_builddir)					\
+	-I$(top_srcdir)						\
+	-I$(top_builddir)/app					\
+	-I$(top_srcdir)/app					\
+	$(GEGL_CFLAGS)						\
+	$(GTK_CFLAGS)						\
+	-I$(includedir)
+
+noinst_LIBRARIES = libapppropgui.a
+libapppropgui_a_SOURCES = \
+	propgui-types.h				\
+	\
+	gimppropgui.c				\
+	gimppropgui.h				\
+	gimppropgui-channel-mixer.c		\
+	gimppropgui-channel-mixer.h		\
+	gimppropgui-color-balance.c		\
+	gimppropgui-color-balance.h		\
+	gimppropgui-color-rotate.c		\
+	gimppropgui-color-rotate.h		\
+	gimppropgui-color-to-alpha.c		\
+	gimppropgui-color-to-alpha.h		\
+	gimppropgui-convolution-matrix.c	\
+	gimppropgui-convolution-matrix.h	\
+	gimppropgui-diffraction-patterns.c	\
+	gimppropgui-diffraction-patterns.h	\
+	gimppropgui-eval.c			\
+	gimppropgui-eval.h			\
+	gimppropgui-focus-blur.c		\
+	gimppropgui-focus-blur.h		\
+	gimppropgui-generic.c			\
+	gimppropgui-generic.h			\
+	gimppropgui-hue-saturation.c		\
+	gimppropgui-hue-saturation.h		\
+	gimppropgui-motion-blur-circular.c	\
+	gimppropgui-motion-blur-circular.h	\
+	gimppropgui-motion-blur-linear.c	\
+	gimppropgui-motion-blur-linear.h	\
+	gimppropgui-motion-blur-zoom.c		\
+	gimppropgui-motion-blur-zoom.h		\
+	gimppropgui-newsprint.c			\
+	gimppropgui-newsprint.h			\
+	gimppropgui-panorama-projection.c	\
+	gimppropgui-panorama-projection.h	\
+	gimppropgui-recursive-transform.c	\
+	gimppropgui-recursive-transform.h	\
+	gimppropgui-shadows-highlights.c	\
+	gimppropgui-shadows-highlights.h	\
+	gimppropgui-spiral.c			\
+	gimppropgui-spiral.h			\
+	gimppropgui-supernova.c			\
+	gimppropgui-supernova.h			\
+	gimppropgui-utils.c			\
+	gimppropgui-utils.h			\
+	gimppropgui-vignette.c			\
+	gimppropgui-vignette.h
+
+all: all-am
+
+.SUFFIXES:
+.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/propgui/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu app/propgui/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):
+
+clean-noinstLIBRARIES:
+	-test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
+
+libapppropgui.a: $(libapppropgui_a_OBJECTS) $(libapppropgui_a_DEPENDENCIES) $(EXTRA_libapppropgui_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libapppropgui.a
+	$(AM_V_AR)$(libapppropgui_a_AR) libapppropgui.a $(libapppropgui_a_OBJECTS) $(libapppropgui_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libapppropgui.a
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-channel-mixer.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-color-balance.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-color-rotate.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-color-to-alpha.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-convolution-matrix.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-diffraction-patterns.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-eval.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-focus-blur.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-generic.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-hue-saturation.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-motion-blur-circular.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-motion-blur-linear.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-motion-blur-zoom.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-newsprint.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-panorama-projection.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-recursive-transform.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-shadows-highlights.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-spiral.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-supernova.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-utils.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui-vignette.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimppropgui.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.c.lo:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  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
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(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) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$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/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/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 $(LIBRARIES)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(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)/gimppropgui-channel-mixer.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-color-balance.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-color-rotate.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-color-to-alpha.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-convolution-matrix.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-diffraction-patterns.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-eval.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-focus-blur.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-generic.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-hue-saturation.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-motion-blur-circular.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-motion-blur-linear.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-motion-blur-zoom.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-newsprint.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-panorama-projection.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-recursive-transform.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-shadows-highlights.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-spiral.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-supernova.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-utils.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-vignette.Po
+	-rm -f ./$(DEPDIR)/gimppropgui.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/gimppropgui-channel-mixer.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-color-balance.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-color-rotate.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-color-to-alpha.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-convolution-matrix.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-diffraction-patterns.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-eval.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-focus-blur.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-generic.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-hue-saturation.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-motion-blur-circular.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-motion-blur-linear.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-motion-blur-zoom.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-newsprint.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-panorama-projection.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-recursive-transform.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-shadows-highlights.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-spiral.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-supernova.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-utils.Po
+	-rm -f ./$(DEPDIR)/gimppropgui-vignette.Po
+	-rm -f ./$(DEPDIR)/gimppropgui.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 \
+	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
+
+
+# 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/propgui/gimppropgui-channel-mixer.c b/app/propgui/gimppropgui-channel-mixer.c
new file mode 100644
index 0000000..df48d7c
--- /dev/null
+++ b/app/propgui/gimppropgui-channel-mixer.c
@@ -0,0 +1,141 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-channel-mixer.c
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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 <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-channel-mixer.h"
+
+#include "gimp-intl.h"
+
+
+GtkWidget *
+_gimp_prop_gui_new_channel_mixer (GObject                  *config,
+                                  GParamSpec              **param_specs,
+                                  guint                     n_param_specs,
+                                  GeglRectangle            *area,
+                                  GimpContext              *context,
+                                  GimpCreatePickerFunc      create_picker_func,
+                                  GimpCreateControllerFunc  create_controller_func,
+                                  gpointer                  creator)
+{
+  GtkWidget   *main_vbox;
+  GtkWidget   *frame;
+  GtkWidget   *vbox;
+  GtkWidget   *checkbox;
+  GtkWidget   *scale;
+  const gchar *label;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  frame = gimp_frame_new (_("Red channel"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_widget_new (config, "rr-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "rg-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "rb-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+
+  frame = gimp_frame_new (_("Green channel"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_widget_new (config, "gr-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "gg-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "gb-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+
+  frame = gimp_frame_new (_("Blue channel"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_widget_new (config, "br-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "bg-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "bb-gain",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+
+  checkbox = gimp_prop_widget_new (config, "preserve-luminosity",
+                                   area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (main_vbox), checkbox, FALSE, FALSE, 0);
+  gtk_widget_show (checkbox);
+
+  return main_vbox;
+}
diff --git a/app/propgui/gimppropgui-channel-mixer.h b/app/propgui/gimppropgui-channel-mixer.h
new file mode 100644
index 0000000..a44f99b
--- /dev/null
+++ b/app/propgui/gimppropgui-channel-mixer.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-channel-mixer.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_PROP_GUI_CHANNEL_MIXER_H__
+#define __GIMP_PROP_GUI_CHANNEL_MIXER_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_channel_mixer (GObject                  *config,
+                                  GParamSpec              **param_specs,
+                                  guint                     n_param_specs,
+                                  GeglRectangle            *area,
+                                  GimpContext              *context,
+                                  GimpCreatePickerFunc      create_picker_func,
+                                  GimpCreateControllerFunc  create_controller_func,
+                                  gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_CHANNEL_MIXER_H__ */
diff --git a/app/propgui/gimppropgui-color-balance.c b/app/propgui/gimppropgui-color-balance.c
new file mode 100644
index 0000000..18127ae
--- /dev/null
+++ b/app/propgui/gimppropgui-color-balance.c
@@ -0,0 +1,149 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-balance.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 <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "operations/gimpcolorbalanceconfig.h"
+
+#include "core/gimpcontext.h"
+
+#include "widgets/gimppropwidgets.h"
+#include "widgets/gimpspinscale.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-color-balance.h"
+
+#include "gimp-intl.h"
+
+
+static void
+create_levels_scale (GObject     *config,
+                     const gchar *property_name,
+                     const gchar *left,
+                     const gchar *right,
+                     GtkWidget   *table,
+                     gint         col)
+{
+  GtkWidget *label;
+  GtkWidget *scale;
+
+  label = gtk_label_new (left);
+  gtk_label_set_xalign (GTK_LABEL (label), 1.0);
+  gtk_table_attach (GTK_TABLE (table), label, 0, 1, col, col + 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (label);
+
+  scale = gimp_prop_spin_scale_new (config, property_name,
+                                    NULL, 0.01, 0.1, 0);
+  gimp_spin_scale_set_label (GIMP_SPIN_SCALE (scale), NULL);
+  gimp_prop_widget_set_factor (scale, 100.0, 0.0, 0.0, 1);
+  gtk_table_attach_defaults (GTK_TABLE (table), scale, 1, 2, col, col + 1);
+  gtk_widget_show (scale);
+
+  label = gtk_label_new (right);
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_table_attach (GTK_TABLE (table), label, 2, 3, col, col + 1,
+                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+  gtk_widget_show (label);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_color_balance (GObject                  *config,
+                                  GParamSpec              **param_specs,
+                                  guint                     n_param_specs,
+                                  GeglRectangle            *area,
+                                  GimpContext              *context,
+                                  GimpCreatePickerFunc      create_picker_func,
+                                  GimpCreateControllerFunc  create_controller_func,
+                                  gpointer                  creator)
+{
+  GtkWidget *main_vbox;
+  GtkWidget *vbox;
+  GtkWidget *hbox;
+  GtkWidget *table;
+  GtkWidget *button;
+  GtkWidget *frame;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  frame = gimp_prop_enum_radio_frame_new (config, "range",
+                                          _("Select Range to Adjust"),
+                                          0, 0);
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  frame = gimp_frame_new (_("Adjust Color Levels"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  /*  The table containing sliders  */
+  table = gtk_table_new (3, 3, FALSE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 4);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 2);
+  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
+  gtk_widget_show (table);
+
+  create_levels_scale (config, "cyan-red",
+                       _("Cyan"), _("Red"),
+                       table, 0);
+
+  create_levels_scale (config, "magenta-green",
+                       _("Magenta"), _("Green"),
+                       table, 1);
+
+  create_levels_scale (config, "yellow-blue",
+                       _("Yellow"), _("Blue"),
+                       table, 2);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  button = gtk_button_new_with_mnemonic (_("R_eset Range"));
+  gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect_swapped (button, "clicked",
+                            G_CALLBACK (gimp_color_balance_config_reset_range),
+                            config);
+
+  button = gimp_prop_check_button_new (config,
+                                       "preserve-luminosity",
+                                       _("Preserve _luminosity"));
+  gtk_box_pack_end (GTK_BOX (main_vbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  return main_vbox;
+}
diff --git a/app/propgui/gimppropgui-color-balance.h b/app/propgui/gimppropgui-color-balance.h
new file mode 100644
index 0000000..ecbee73
--- /dev/null
+++ b/app/propgui/gimppropgui-color-balance.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-balance.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_PROP_GUI_COLOR_BALANCE_H__
+#define __GIMP_PROP_GUI_COLOR_BALANCE_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_color_balance (GObject                  *config,
+                                  GParamSpec              **param_specs,
+                                  guint                     n_param_specs,
+                                  GeglRectangle            *area,
+                                  GimpContext              *context,
+                                  GimpCreatePickerFunc      create_picker_func,
+                                  GimpCreateControllerFunc  create_controller_func,
+                                  gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_COLOR_BALANCE_H__ */
diff --git a/app/propgui/gimppropgui-color-rotate.c b/app/propgui/gimppropgui-color-rotate.c
new file mode 100644
index 0000000..1461084
--- /dev/null
+++ b/app/propgui/gimppropgui-color-rotate.c
@@ -0,0 +1,260 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-rotate.c
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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 <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "widgets/gimppropwidgets.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-color-rotate.h"
+#include "gimppropgui-generic.h"
+
+#include "gimp-intl.h"
+
+
+static void
+invert_segment_clicked (GtkWidget *button,
+                        GtkWidget *dial)
+{
+  gdouble  alpha, beta;
+  gboolean clockwise;
+
+  g_object_get (dial,
+                "alpha",           &alpha,
+                "beta",            &beta,
+                "clockwise-delta", &clockwise,
+                NULL);
+
+  g_object_set (dial,
+                "alpha",           beta,
+                "beta",            alpha,
+                "clockwise-delta", ! clockwise,
+                NULL);
+}
+
+static void
+select_all_clicked (GtkWidget *button,
+                    GtkWidget *dial)
+{
+  gdouble  alpha, beta;
+  gboolean clockwise;
+
+  g_object_get (dial,
+                "alpha",           &alpha,
+                "clockwise-delta", &clockwise,
+                NULL);
+
+  beta = alpha - (clockwise ? -1 : 1) * 0.00001;
+
+  if (beta < 0)
+    beta += 2 * G_PI;
+
+  if (beta > 2 * G_PI)
+    beta -= 2 * G_PI;
+
+  g_object_set (dial,
+                "beta", beta,
+                NULL);
+}
+
+static GtkWidget *
+gimp_prop_angle_range_box_new (GObject     *config,
+                               const gchar *alpha_property_name,
+                               const gchar *beta_property_name,
+                               const gchar *clockwise_property_name)
+{
+  GtkWidget *main_hbox;
+  GtkWidget *vbox;
+  GtkWidget *scale;
+  GtkWidget *hbox;
+  GtkWidget *button;
+  GtkWidget *invert_button;
+  GtkWidget *all_button;
+  GtkWidget *dial;
+
+  main_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+  gtk_box_pack_start (GTK_BOX (main_hbox), vbox, TRUE, TRUE, 0);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_spin_scale_new (config, alpha_property_name, NULL,
+                                    1.0, 15.0, 2);
+  gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (scale), TRUE);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_spin_scale_new (config, beta_property_name, NULL,
+                                    1.0, 15.0, 2);
+  gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (scale), TRUE);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  button = gimp_prop_check_button_new (config, clockwise_property_name,
+                                       _("Clockwise"));
+  gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+  gtk_widget_show (button);
+
+  invert_button = gtk_button_new_with_label (_("Invert Range"));
+  gtk_box_pack_start (GTK_BOX (hbox), invert_button, TRUE, TRUE, 0);
+  gtk_widget_show (invert_button);
+
+  all_button = gtk_button_new_with_label (_("Select All"));
+  gtk_box_pack_start (GTK_BOX (hbox), all_button, TRUE, TRUE, 0);
+  gtk_widget_show (all_button);
+
+  dial = gimp_prop_angle_range_dial_new (config,
+                                         alpha_property_name,
+                                         beta_property_name,
+                                         clockwise_property_name);
+  gtk_box_pack_start (GTK_BOX (main_hbox), dial, FALSE, FALSE, 0);
+  gtk_widget_show (dial);
+
+  g_signal_connect (invert_button, "clicked",
+                    G_CALLBACK (invert_segment_clicked),
+                    dial);
+
+  g_signal_connect (all_button, "clicked",
+                    G_CALLBACK (select_all_clicked),
+                    dial);
+
+  return main_hbox;
+}
+
+static GtkWidget *
+gimp_prop_polar_box_new (GObject     *config,
+                         const gchar *angle_property_name,
+                         const gchar *radius_property_name)
+{
+  GtkWidget *main_hbox;
+  GtkWidget *vbox;
+  GtkWidget *scale;
+  GtkWidget *polar;
+
+  main_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+  gtk_box_pack_start (GTK_BOX (main_hbox), vbox, TRUE, TRUE, 0);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_spin_scale_new (config, angle_property_name, NULL,
+                                    1.0, 15.0, 2);
+  gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (scale), TRUE);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_spin_scale_new (config, radius_property_name, NULL,
+                                    1.0, 15.0, 2);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  polar = gimp_prop_polar_new (config,
+                               angle_property_name,
+                               radius_property_name);
+  gtk_box_pack_start (GTK_BOX (main_hbox), polar, FALSE, FALSE, 0);
+  gtk_widget_show (polar);
+
+  return main_hbox;
+}
+
+GtkWidget *
+_gimp_prop_gui_new_color_rotate (GObject                  *config,
+                                 GParamSpec              **param_specs,
+                                 guint                     n_param_specs,
+                                 GeglRectangle            *area,
+                                 GimpContext              *context,
+                                 GimpCreatePickerFunc      create_picker_func,
+                                 GimpCreateControllerFunc  create_controller_func,
+                                 gpointer                  creator)
+{
+  GtkWidget *main_vbox;
+  GtkWidget *frame;
+  GtkWidget *vbox;
+  GtkWidget *box;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  frame = gimp_frame_new (_("Source Range"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  box = gimp_prop_angle_range_box_new (config,
+                                       param_specs[1]->name,
+                                       param_specs[2]->name,
+                                       param_specs[0]->name);
+  gtk_container_add (GTK_CONTAINER (frame), box);
+  gtk_widget_show (box);
+
+  frame = gimp_frame_new (_("Destination Range"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  box = gimp_prop_angle_range_box_new (config,
+                                       param_specs[4]->name,
+                                       param_specs[5]->name,
+                                       param_specs[3]->name);
+  gtk_container_add (GTK_CONTAINER (frame), box);
+  gtk_widget_show (box);
+
+  frame = gimp_frame_new (_("Gray Handling"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  box = _gimp_prop_gui_new_generic (config,
+                                    param_specs + 6, 2,
+                                    area, context,
+                                    create_picker_func,
+                                    create_controller_func,
+                                    creator);
+  gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, FALSE, 0);
+  gtk_widget_show (box);
+
+  box = gimp_prop_polar_box_new (config,
+                                 param_specs[8]->name,
+                                 param_specs[9]->name);
+  gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, FALSE, 0);
+  gtk_widget_show (box);
+
+  return main_vbox;
+}
diff --git a/app/propgui/gimppropgui-color-rotate.h b/app/propgui/gimppropgui-color-rotate.h
new file mode 100644
index 0000000..a69770d
--- /dev/null
+++ b/app/propgui/gimppropgui-color-rotate.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-rotate.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_PROP_GUI_COLOR_ROTATE_H__
+#define __GIMP_PROP_GUI_COLOR_ROTATE_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_color_rotate (GObject                  *config,
+                                 GParamSpec              **param_specs,
+                                 guint                     n_param_specs,
+                                 GeglRectangle            *area,
+                                 GimpContext              *context,
+                                 GimpCreatePickerFunc      create_picker_func,
+                                 GimpCreateControllerFunc  create_controller_func,
+                                 gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_COLOR_ROTATE_H__ */
diff --git a/app/propgui/gimppropgui-color-to-alpha.c b/app/propgui/gimppropgui-color-to-alpha.c
new file mode 100644
index 0000000..0918bf9
--- /dev/null
+++ b/app/propgui/gimppropgui-color-to-alpha.c
@@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-to-alpha.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 <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-color-to-alpha.h"
+#include "gimppropgui-generic.h"
+
+#include "gimp-intl.h"
+
+
+static void
+threshold_picked (GObject       *config,
+                  gpointer       identifier,
+                  gdouble        x,
+                  gdouble        y,
+                  const Babl    *sample_format,
+                  const GimpRGB *picked_color)
+{
+  GimpRGB *color;
+  gdouble  threshold = 0.0;
+
+  g_object_get (config,
+                "color", &color,
+                NULL);
+
+  threshold = MAX (threshold, fabs (picked_color->r - color->r));
+  threshold = MAX (threshold, fabs (picked_color->g - color->g));
+  threshold = MAX (threshold, fabs (picked_color->b - color->b));
+
+  g_object_set (config,
+                identifier, threshold,
+                NULL);
+
+  g_free (color);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_color_to_alpha (GObject                  *config,
+                                   GParamSpec              **param_specs,
+                                   guint                     n_param_specs,
+                                   GeglRectangle            *area,
+                                   GimpContext              *context,
+                                   GimpCreatePickerFunc      create_picker_func,
+                                   GimpCreateControllerFunc  create_controller_func,
+                                   gpointer                  creator)
+{
+  GtkWidget   *vbox;
+  GtkWidget   *button;
+  GtkWidget   *hbox;
+  GtkWidget   *scale;
+  const gchar *label;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  button = _gimp_prop_gui_new_generic (config, param_specs, 1,
+                                       area, context, create_picker_func, NULL,
+                                       creator);
+  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  scale = gimp_prop_widget_new (config, "transparency-threshold",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
+  gtk_widget_show (scale);
+
+  if (create_picker_func)
+    {
+      button = create_picker_func (creator,
+                                   "transparency-threshold",
+                                   GIMP_ICON_COLOR_PICKER_GRAY,
+                                   _("Pick farthest full-transparency color"),
+                                   /* pick_abyss = */ FALSE,
+                                   (GimpPickerCallback) threshold_picked,
+                                   config);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_widget_show (button);
+    }
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  scale = gimp_prop_widget_new (config, "opacity-threshold",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
+  gtk_widget_show (scale);
+
+  if (create_picker_func)
+    {
+      button = create_picker_func (creator,
+                                   "opacity-threshold",
+                                   GIMP_ICON_COLOR_PICKER_GRAY,
+                                   _("Pick nearest full-opacity color"),
+                                   /* pick_abyss = */ FALSE,
+                                   (GimpPickerCallback) threshold_picked,
+                                   config);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_widget_show (button);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-color-to-alpha.h b/app/propgui/gimppropgui-color-to-alpha.h
new file mode 100644
index 0000000..af5a325
--- /dev/null
+++ b/app/propgui/gimppropgui-color-to-alpha.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-color-to-alpha.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_PROP_GUI_COLOR_TO_ALPHA_H__
+#define __GIMP_PROP_GUI_COLOR_TO_ALPHA_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_color_to_alpha (GObject                  *config,
+                                   GParamSpec              **param_specs,
+                                   guint                     n_param_specs,
+                                   GeglRectangle            *area,
+                                   GimpContext              *context,
+                                   GimpCreatePickerFunc      create_picker_func,
+                                   GimpCreateControllerFunc  create_controller_func,
+                                   gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_COLOR_TO_ALPHA_H__ */
diff --git a/app/propgui/gimppropgui-convolution-matrix.c b/app/propgui/gimppropgui-convolution-matrix.c
new file mode 100644
index 0000000..7a5635e
--- /dev/null
+++ b/app/propgui/gimppropgui-convolution-matrix.c
@@ -0,0 +1,309 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-convolution-matrix.c
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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 <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-convolution-matrix.h"
+#include "gimppropgui-generic.h"
+
+#include "gimp-intl.h"
+
+
+static const gchar *
+convolution_matrix_prop_name (gint x,
+                              gint y)
+{
+  static const gchar * const prop_names[5][5] = {
+    {"a1", "a2", "a3", "a4", "a5"},
+    {"b1", "b2", "b3", "b4", "b5"},
+    {"c1", "c2", "c3", "c4", "c5"},
+    {"d1", "d2", "d3", "d4", "d5"},
+    {"e1", "e2", "e3", "e4", "e5"}};
+
+  return prop_names[x][y];
+}
+
+static void
+convolution_matrix_rotate_flip (GtkWidget *button,
+                                GObject   *config)
+{
+  gint rotate = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (button),
+                                                    "convolution-matrix-rotate"));
+  gint flip   = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (button),
+                                                    "convolution-matrix-flip"));
+  gint x, y;
+
+  while (rotate--)
+    {
+      for (y = 0; y < 2; y++)
+        {
+          for (x = y; x < 4 - y; x++)
+            {
+              gint    i;
+              gdouble temp;
+
+              g_object_get (config,
+                            convolution_matrix_prop_name (x, y), &temp,
+                            NULL);
+
+              for (i = 0; i < 4; i++)
+                {
+                  gint    next_x, next_y;
+                  gdouble val;
+
+                  next_x = 4 - y;
+                  next_y = x;
+
+                  if  (i < 3)
+                    {
+                      g_object_get (config,
+                                    convolution_matrix_prop_name (next_x, next_y), &val,
+                                    NULL);
+                    }
+                  else
+                    {
+                      val = temp;
+                    }
+
+                  g_object_set (config,
+                                convolution_matrix_prop_name (x, y), val,
+                                NULL);
+
+                  x = next_x;
+                  y = next_y;
+                }
+            }
+        }
+    }
+
+  while (flip--)
+    {
+      for (y = 0; y < 5; y++)
+        {
+          for (x = 0; x < 2; x++)
+            {
+              gdouble val1, val2;
+
+              g_object_get (config,
+                            convolution_matrix_prop_name (x, y), &val1,
+                            NULL);
+              g_object_get (config,
+                            convolution_matrix_prop_name (4 - x, y), &val2,
+                            NULL);
+
+              g_object_set (config,
+                            convolution_matrix_prop_name (x, y), val2,
+                            NULL);
+              g_object_set (config,
+                            convolution_matrix_prop_name (4 - x, y), val1,
+                            NULL);
+            }
+        }
+    }
+}
+
+GtkWidget *
+_gimp_prop_gui_new_convolution_matrix (GObject                  *config,
+                                       GParamSpec              **param_specs,
+                                       guint                     n_param_specs,
+                                       GeglRectangle            *area,
+                                       GimpContext              *context,
+                                       GimpCreatePickerFunc      create_picker_func,
+                                       GimpCreateControllerFunc  create_controller_func,
+                                       gpointer                  creator)
+{
+  GtkWidget   *main_vbox;
+  GtkWidget   *vbox;
+  GtkWidget   *table;
+  GtkWidget   *hbox;
+  GtkWidget   *scale;
+  GtkWidget   *vbox2;
+  const gchar *label;
+  gint         x, y;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 8);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_box_pack_start (GTK_BOX (main_vbox), vbox, FALSE, FALSE, 0);
+  gtk_widget_show (vbox);
+
+  /* matrix */
+
+  table = gtk_table_new (5, 5, TRUE);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 2);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 4);
+  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
+  gtk_widget_show (table);
+
+  for (y = 0; y < 5; y++)
+    {
+      for (x = 0; x < 5; x++)
+        {
+          GtkWidget *spin;
+
+          spin = gimp_prop_spin_button_new (config,
+                                            convolution_matrix_prop_name (x, y),
+                                            1.0, 10.0, 2);
+          gtk_entry_set_width_chars (GTK_ENTRY (spin), 8);
+          gtk_table_attach (GTK_TABLE (table), spin,
+                            x, x + 1, y, y + 1,
+                            GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND,
+                            0, 0);
+          gtk_widget_show (spin);
+        }
+    }
+
+  /* rotate / flip buttons */
+  {
+    typedef struct
+    {
+      const gchar *tooltip;
+      const gchar *icon_name;
+      gint         rotate;
+      gint         flip;
+    } ButtonInfo;
+
+    gint             i;
+    const ButtonInfo buttons[] = {
+      {
+        .tooltip   = _("Rotate matrix 90° counter-clockwise"),
+        .icon_name = GIMP_ICON_OBJECT_ROTATE_270,
+        .rotate    = 1,
+        .flip      = 0
+      },
+      {
+        .tooltip   = _("Rotate matrix 90° clockwise"),
+        .icon_name = GIMP_ICON_OBJECT_ROTATE_90,
+        .rotate    = 3,
+        .flip      = 0
+      },
+      {
+        .tooltip   = _("Flip matrix horizontally"),
+        .icon_name = GIMP_ICON_OBJECT_FLIP_HORIZONTAL,
+        .rotate    = 0,
+        .flip      = 1
+      },
+      {
+        .tooltip   = _("Flip matrix vertically"),
+        .icon_name = GIMP_ICON_OBJECT_FLIP_VERTICAL,
+        .rotate    = 2,
+        .flip      = 1
+      }};
+
+    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+    gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+    gtk_widget_show (hbox);
+
+    for (i = 0; i < G_N_ELEMENTS (buttons); i++)
+      {
+        const ButtonInfo *info = &buttons[i];
+        GtkWidget        *button;
+        GtkWidget        *image;
+
+        button = gtk_button_new ();
+        gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+        gtk_widget_set_tooltip_text (button, info->tooltip);
+        gtk_widget_set_can_focus (button, FALSE);
+        gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
+        gtk_widget_show (button);
+
+        image = gtk_image_new_from_icon_name (info->icon_name,
+                                              GTK_ICON_SIZE_BUTTON);
+        gtk_container_add (GTK_CONTAINER (button), image);
+        gtk_widget_show (image);
+
+        g_object_set_data (G_OBJECT (button),
+                           "convolution-matrix-rotate",
+                           GINT_TO_POINTER (info->rotate));
+        g_object_set_data (G_OBJECT (button),
+                           "convolution-matrix-flip",
+                           GINT_TO_POINTER (info->flip));
+
+        g_signal_connect (button, "clicked",
+                          G_CALLBACK (convolution_matrix_rotate_flip),
+                          config);
+      }
+  }
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_box_pack_start (GTK_BOX (main_vbox), vbox, FALSE, FALSE, 0);
+  gtk_widget_show (vbox);
+
+  /* divisor / offset spin scales */
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  scale = gimp_prop_widget_new (config, "divisor",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "offset",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
+  gtk_widget_show (scale);
+
+  /* rest of the properties */
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  vbox2 = _gimp_prop_gui_new_generic (config,
+                                      param_specs + 27, 4,
+                                      area, context,
+                                      create_picker_func,
+                                      create_controller_func,
+                                      creator);
+  gtk_box_pack_start (GTK_BOX (hbox), vbox2, TRUE, TRUE, 0);
+  gtk_widget_show (vbox2);
+
+  vbox2 = _gimp_prop_gui_new_generic (config,
+                                      param_specs + 31,
+                                      n_param_specs - 31,
+                                      area, context,
+                                      create_picker_func,
+                                      create_controller_func,
+                                      creator);
+  gtk_box_pack_start (GTK_BOX (hbox), vbox2, TRUE, TRUE, 0);
+  gtk_widget_show (vbox2);
+
+  return main_vbox;
+}
diff --git a/app/propgui/gimppropgui-convolution-matrix.h b/app/propgui/gimppropgui-convolution-matrix.h
new file mode 100644
index 0000000..21278c5
--- /dev/null
+++ b/app/propgui/gimppropgui-convolution-matrix.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-convolution-matrix.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_PROP_GUI_CONVOLUTION_MATRIX_H__
+#define __GIMP_PROP_GUI_CONVOLUTION_MATRIX_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_convolution_matrix (GObject                  *config,
+                                       GParamSpec              **param_specs,
+                                       guint                     n_param_specs,
+                                       GeglRectangle            *area,
+                                       GimpContext              *context,
+                                       GimpCreatePickerFunc      create_picker_func,
+                                       GimpCreateControllerFunc  create_controller_func,
+                                       gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_CONVOLUTION_MATRIX_H__ */
diff --git a/app/propgui/gimppropgui-diffraction-patterns.c b/app/propgui/gimppropgui-diffraction-patterns.c
new file mode 100644
index 0000000..ce4dc87
--- /dev/null
+++ b/app/propgui/gimppropgui-diffraction-patterns.c
@@ -0,0 +1,105 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-diffraction-patterns.c
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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 <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-diffraction-patterns.h"
+#include "gimppropgui-generic.h"
+
+#include "gimp-intl.h"
+
+
+GtkWidget *
+_gimp_prop_gui_new_diffraction_patterns (GObject                  *config,
+                                         GParamSpec              **param_specs,
+                                         guint                     n_param_specs,
+                                         GeglRectangle            *area,
+                                         GimpContext              *context,
+                                         GimpCreatePickerFunc      create_picker_func,
+                                         GimpCreateControllerFunc  create_controller_func,
+                                         gpointer                  creator)
+{
+  GtkWidget *notebook;
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  notebook = gtk_notebook_new ();
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs + 0, 3,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 6);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook), vbox,
+                            gtk_label_new (_("Frequencies")));
+  gtk_widget_show (vbox);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs + 3, 3,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 6);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook), vbox,
+                            gtk_label_new (_("Contours")));
+  gtk_widget_show (vbox);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs + 6, 3,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 6);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook), vbox,
+                            gtk_label_new (_("Sharp Edges")));
+  gtk_widget_show (vbox);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs + 9, 3,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 6);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook), vbox,
+                            gtk_label_new (_("Other Options")));
+  gtk_widget_show (vbox);
+
+  return notebook;
+}
diff --git a/app/propgui/gimppropgui-diffraction-patterns.h b/app/propgui/gimppropgui-diffraction-patterns.h
new file mode 100644
index 0000000..dd6bbc5
--- /dev/null
+++ b/app/propgui/gimppropgui-diffraction-patterns.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-diffraction-patterns.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_PROP_GUI_DIFFRACTION_PATTERNS_H__
+#define __GIMP_PROP_GUI_DIFFRACTION_PATTERNS_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_diffraction_patterns (GObject                  *config,
+                                         GParamSpec              **param_specs,
+                                         guint                     n_param_specs,
+                                         GeglRectangle            *area,
+                                         GimpContext              *context,
+                                         GimpCreatePickerFunc      create_picker_func,
+                                         GimpCreateControllerFunc  create_controller_func,
+                                         gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_DIFFRACTION_PATTERNS_H__ */
diff --git a/app/propgui/gimppropgui-eval.c b/app/propgui/gimppropgui-eval.c
new file mode 100644
index 0000000..719e500
--- /dev/null
+++ b/app/propgui/gimppropgui-eval.c
@@ -0,0 +1,1039 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-eval.c
+ * Copyright (C) 2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Less General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* This is a simple interpreter for the GUM language (the GEGL UI Meta
+ * language), used in certain property keys of GEGL operations.  What follows
+ * is a hand-wavy summary of the syntax and semantics (no BNF for you!)
+ *
+ * There are currently two types of expressions:
+ *
+ * Boolean expressions
+ * -------------------
+ *
+ * There are three types of simple boolean expressions:
+ *
+ *   - Literal:  Either `0` or `1`, evaluating to FALSE and TRUE, respectively.
+ *
+ *   - Reference:  Has the form `$key` or `$property.key`.  Evaluates to the
+ *     value of key `key`, which should itself be a boolean expression.  In
+ *     the first form, `key` refers to a key of the same property to which the
+ *     currently-evaluated key belongs.  In the second form, `key` refers to a
+ *     key of `property`.
+ *
+ *   - Dependency:  Dependencies begin with the name of a property, on which
+ *     the result depends.  Currently supported property types are:
+ *
+ *       - Boolean:  The expression consists of the property name alone, and
+ *         its value is the value of the property.
+ *
+ *       - Enum:  The property name shall be followed by a brace-enclosed,
+ *         comma-separated list of enum values, given as nicks.  The expression
+ *         evaluates to TRUE iff the property matches any of the values.
+ *
+ * Complex boolean expressions can be formed using `!` (negation), `&`
+ * (conjunction), `|` (disjunction), and parentheses (grouping), following the
+ * usual precedence rules.
+ *
+ * String expressions
+ * ------------------
+ *
+ * There are three types of simple string expressions:
+ *
+ *   - Literal:  A string literal, surrounded by single quotes (`'`).  Special
+ *     characters (in particular, single quotes) can be escaped using a
+ *     backslash (`\`).
+ *
+ *   - Reference:  Same as a boolean reference, but should refer to a key
+ *     containing a string expression.
+ *
+ *   - Deferred literal:  Names a key, in the same fashion as a reference, but
+ *     without the leading `$`.  The value of this key is taken literally as
+ *     the value of the expression.  Deferred literals should usually be
+ *     favored over inline string literals, because they can be translated
+ *     independently of the expression.
+ *
+ * Currently, the only complex string expression is string selection:  It has
+ * the form of a bracket-enclosed, comma-separated list of expressions of the
+ * form `<condition> : <value>`, where `<condition>` is a boolean expression,
+ * and `<value>` is a string expression.  The result of the expression is the
+ * associated value of the first condition that evaluates to TRUE.  If no
+ * condition is met, the result is NULL.
+ *
+ *
+ * Whitespace separating subexpressions is insignificant.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gegl-paramspecs.h>
+#include <gtk/gtk.h>
+
+#include "propgui-types.h"
+
+#include "gimppropgui-eval.h"
+
+
+typedef enum
+{
+  GIMP_PROP_EVAL_FAILED  /* generic error condition */
+} GimpPropEvalErrorCode;
+
+
+static gboolean   gimp_prop_eval_boolean_impl     (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar    *key,
+                                                   gint            default_value,
+                                                   GError        **error,
+                                                   gint            depth);
+static gboolean   gimp_prop_eval_boolean_or       (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+static gboolean   gimp_prop_eval_boolean_and      (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+static gboolean   gimp_prop_eval_boolean_not      (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+static gboolean   gimp_prop_eval_boolean_group    (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+static gboolean   gimp_prop_eval_boolean_simple   (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+
+static gchar    * gimp_prop_eval_string_impl      (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar    *key,
+                                                   const gchar    *default_value,
+                                                   GError        **error,
+                                                   gint            depth);
+static gchar    * gimp_prop_eval_string_selection (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+static gchar    * gimp_prop_eval_string_simple    (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   gint            depth);
+
+static gboolean   gimp_prop_eval_parse_reference  (GObject        *config,
+                                                   GParamSpec     *pspec,
+                                                   const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error,
+                                                   GParamSpec    **ref_pspec,
+                                                   gchar         **ref_key);
+
+static gboolean   gimp_prop_eval_depth_test       (gint            depth,
+                                                   GError        **error);
+
+static gchar    * gimp_prop_eval_read_token       (const gchar   **expr,
+                                                   gchar         **t,
+                                                   GError        **error);
+static gboolean   gimp_prop_eval_is_name          (const gchar    *token);
+
+#define GIMP_PROP_EVAL_ERROR (gimp_prop_eval_error_quark ())
+
+static GQuark     gimp_prop_eval_error_quark      (void);
+
+
+/*  public functions  */
+
+gboolean
+gimp_prop_eval_boolean (GObject     *config,
+                        GParamSpec  *pspec,
+                        const gchar *key,
+                        gboolean     default_value)
+{
+  GError   *error = NULL;
+  gboolean  result;
+
+  result = gimp_prop_eval_boolean_impl (config, pspec,
+                                        key, default_value, &error, 0);
+
+  if (error)
+    {
+      g_warning ("in object of type '%s': %s",
+                 G_OBJECT_TYPE_NAME (config),
+                 error->message);
+
+      g_error_free (error);
+
+      return default_value;
+    }
+
+  return result;
+}
+
+gchar *
+gimp_prop_eval_string (GObject     *config,
+                       GParamSpec  *pspec,
+                       const gchar *key,
+                       const gchar *default_value)
+{
+  GError *error = NULL;
+  gchar  *result;
+
+  result = gimp_prop_eval_string_impl (config, pspec,
+                                       key, default_value, &error, 0);
+
+  if (error)
+    {
+      g_warning ("in object of type '%s': %s",
+                 G_OBJECT_TYPE_NAME (config),
+                 error->message);
+
+      g_error_free (error);
+
+      return g_strdup (default_value);
+    }
+
+  return result;
+}
+
+
+/*  private functions  */
+
+static gboolean
+gimp_prop_eval_boolean_impl (GObject      *config,
+                             GParamSpec   *pspec,
+                             const gchar  *key,
+                             gint          default_value,
+                             GError      **error,
+                             gint          depth)
+{
+  const gchar *expr;
+  gchar       *t      = NULL;
+  gboolean     result = FALSE;
+
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return FALSE;
+
+  expr = gegl_param_spec_get_property_key (pspec, key);
+
+  if (! expr)
+    {
+      /* we use `default_value < 0` to specify that the key must exist */
+      if (default_value < 0)
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "key '%s' of property '%s' not found",
+                       key,
+                       g_param_spec_get_name (pspec));
+
+          return FALSE;
+        }
+
+      return default_value;
+    }
+
+  gimp_prop_eval_read_token (&expr, &t, error);
+
+  if (! *error)
+    {
+      result = gimp_prop_eval_boolean_or (config, pspec,
+                                          &expr, &t, error, depth);
+    }
+
+  /* check for trailing tokens at the end of the expression */
+  if (! *error && t)
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "invalid expression");
+    }
+
+  g_free (t);
+
+  if (*error)
+    {
+      g_prefix_error (error,
+                      "in key '%s' of property '%s': ",
+                      key,
+                      g_param_spec_get_name (pspec));
+
+      return FALSE;
+    }
+
+  return result;
+}
+
+static gboolean
+gimp_prop_eval_boolean_or (GObject      *config,
+                           GParamSpec   *pspec,
+                           const gchar **expr,
+                           gchar       **t,
+                           GError      **error,
+                           gint          depth)
+{
+  gboolean result;
+
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return FALSE;
+
+  result = gimp_prop_eval_boolean_and (config, pspec,
+                                       expr, t, error, depth);
+
+  while (! *error && ! g_strcmp0 (*t, "|"))
+    {
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        return FALSE;
+
+      /* keep evaluating even if `result` is TRUE, because we still need to
+       * parse the rest of the subexpression.
+       */
+      result |= gimp_prop_eval_boolean_and (config, pspec,
+                                            expr, t, error, depth);
+    }
+
+  return result;
+}
+
+static gboolean
+gimp_prop_eval_boolean_and (GObject      *config,
+                            GParamSpec   *pspec,
+                            const gchar **expr,
+                            gchar       **t,
+                            GError      **error,
+                            gint          depth)
+{
+  gboolean result;
+
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return FALSE;
+
+  result = gimp_prop_eval_boolean_not (config, pspec,
+                                       expr, t, error, depth);
+
+  while (! *error && ! g_strcmp0 (*t, "&"))
+    {
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        return FALSE;
+
+      /* keep evaluating even if `result` is FALSE, because we still need to
+       * parse the rest of the subexpression.
+       */
+      result &= gimp_prop_eval_boolean_not (config, pspec,
+                                            expr, t, error, depth);
+    }
+
+  return result;
+}
+
+static gboolean
+gimp_prop_eval_boolean_not (GObject      *config,
+                            GParamSpec   *pspec,
+                            const gchar **expr,
+                            gchar       **t,
+                            GError      **error,
+                            gint          depth)
+{
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return FALSE;
+
+  if (! g_strcmp0 (*t, "!"))
+    {
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        return FALSE;
+
+      return ! gimp_prop_eval_boolean_not (config, pspec,
+                                           expr, t, error, depth + 1);
+    }
+
+  return gimp_prop_eval_boolean_group (config, pspec,
+                                       expr, t, error, depth);
+}
+
+static gboolean
+gimp_prop_eval_boolean_group (GObject      *config,
+                              GParamSpec   *pspec,
+                              const gchar **expr,
+                              gchar       **t,
+                              GError      **error,
+                              gint          depth)
+{
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return FALSE;
+
+  if (! g_strcmp0 (*t, "("))
+    {
+      gboolean result;
+
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        return FALSE;
+
+      result = gimp_prop_eval_boolean_or (config, pspec,
+                                          expr, t, error, depth + 1);
+
+      if (*error)
+        return FALSE;
+
+      if (g_strcmp0 (*t, ")"))
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "unterminated group");
+
+          return FALSE;
+        }
+
+      gimp_prop_eval_read_token (expr, t, error);
+
+      return result;
+    }
+
+  return gimp_prop_eval_boolean_simple (config, pspec,
+                                        expr, t, error, depth);
+}
+
+static gboolean
+gimp_prop_eval_boolean_simple (GObject      *config,
+                               GParamSpec   *pspec,
+                               const gchar **expr,
+                               gchar       **t,
+                               GError      **error,
+                               gint          depth)
+{
+  gboolean result;
+
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return FALSE;
+
+  if (! *t)
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "invalid expression");
+
+      return FALSE;
+    }
+
+  /* literal */
+  if (! strcmp (*t, "0"))
+    {
+      result = FALSE;
+
+      gimp_prop_eval_read_token (expr, t, error);
+    }
+  else if (! strcmp (*t, "1"))
+    {
+      result = TRUE;
+
+      gimp_prop_eval_read_token (expr, t, error);
+    }
+  /* reference */
+  else if (! strcmp (*t, "$"))
+    {
+      gchar *key;
+
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        return FALSE;
+
+      if (! gimp_prop_eval_parse_reference (config, pspec,
+                                            expr, t, error, &pspec, &key))
+        return FALSE;
+
+      result = gimp_prop_eval_boolean_impl (config, pspec,
+                                            key, -1, error, depth + 1);
+
+      g_free (key);
+    }
+  /* dependency */
+  else if (gimp_prop_eval_is_name (*t))
+    {
+      const gchar *property_name;
+      GParamSpec  *pspec;
+      GType        type;
+
+      property_name = *t;
+
+      pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (config),
+                                            property_name);
+
+      if (! pspec)
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "property '%s' not found",
+                       property_name);
+
+          return TRUE;
+        }
+
+      property_name = g_param_spec_get_name (pspec);
+      type          = G_PARAM_SPEC_VALUE_TYPE (pspec);
+
+      if (g_type_is_a (type, G_TYPE_BOOLEAN))
+        {
+          g_object_get (config, property_name, &result, NULL);
+        }
+      else if (g_type_is_a (type, G_TYPE_ENUM))
+        {
+          GEnumClass *enum_class;
+          gint        value;
+
+          gimp_prop_eval_read_token (expr, t, error);
+
+          if (*error)
+            return FALSE;
+
+          if (g_strcmp0 (*t , "{"))
+            {
+              g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                           "missing enum value set "
+                           "for property '%s'",
+                           property_name);
+
+              return FALSE;
+            }
+
+          enum_class = g_type_class_peek (type);
+
+          g_object_get (config, property_name, &value, NULL);
+
+          result = FALSE;
+
+          while (gimp_prop_eval_read_token (expr, t, error) &&
+                 gimp_prop_eval_is_name (*t))
+            {
+              const gchar *nick;
+              GEnumValue  *enum_value;
+
+              nick       = *t;
+              enum_value = g_enum_get_value_by_nick (enum_class, nick);
+
+              if (! enum_value)
+                {
+                  g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                               "invalid enum value '%s' "
+                               "for property '%s'",
+                               nick,
+                               property_name);
+
+                  return FALSE;
+                }
+
+              if (value == enum_value->value)
+                result = TRUE;
+
+              gimp_prop_eval_read_token (expr, t, error);
+
+              if (*error)
+                return FALSE;
+
+              if (! g_strcmp0 (*t, ","))
+                {
+                  continue;
+                }
+              else if (! g_strcmp0 (*t, "}"))
+                {
+                  break;
+                }
+              else
+                {
+                  g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                               "invalid enum value set "
+                               "for property '%s'",
+                               property_name);
+
+                  return FALSE;
+                }
+            }
+
+          if (*error)
+            return FALSE;
+
+          if (g_strcmp0 (*t, "}"))
+            {
+              g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                           "unterminated enum value set "
+                           "for property '%s'",
+                           property_name);
+
+              return FALSE;
+            }
+        }
+      else
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "invalid type "
+                       "for property '%s'",
+                       property_name);
+
+          return FALSE;
+        }
+
+      gimp_prop_eval_read_token (expr, t, error);
+    }
+  else
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "invalid expression");
+
+      return FALSE;
+    }
+
+  return result;
+}
+
+static gchar *
+gimp_prop_eval_string_impl (GObject      *config,
+                            GParamSpec   *pspec,
+                            const gchar  *key,
+                            const gchar  *default_value,
+                            GError      **error,
+                            gint          depth)
+{
+  const gchar *expr;
+  gchar       *t      = NULL;
+  gchar       *result = NULL;
+
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return NULL;
+
+  expr = gegl_param_spec_get_property_key (pspec, key);
+
+  if (! expr)
+    return g_strdup (default_value);
+
+  gimp_prop_eval_read_token (&expr, &t, error);
+
+  if (! *error)
+    {
+      result = gimp_prop_eval_string_selection (config, pspec,
+                                                &expr, &t, error, depth);
+    }
+
+  /* check for trailing tokens at the end of the expression */
+  if (! *error && t)
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "invalid expression");
+
+      g_free (result);
+    }
+
+  g_free (t);
+
+  if (*error)
+    {
+      g_prefix_error (error,
+                      "in key '%s' of property '%s': ",
+                      key,
+                      g_param_spec_get_name (pspec));
+
+      return NULL;
+    }
+
+  if (result)
+    return result;
+  else
+    return g_strdup (default_value);
+}
+
+static gchar *
+gimp_prop_eval_string_selection (GObject      *config,
+                                 GParamSpec   *pspec,
+                                 const gchar **expr,
+                                 gchar       **t,
+                                 GError      **error,
+                                 gint          depth)
+{
+  if (! gimp_prop_eval_depth_test (depth, error) || ! t)
+    return NULL;
+
+  if (! g_strcmp0 (*t, "["))
+    {
+      gboolean  match  = FALSE;
+      gchar    *result = NULL;
+
+      if (! g_strcmp0 (gimp_prop_eval_read_token (expr, t, error), "]"))
+        return NULL;
+
+      while (! *error)
+        {
+          gboolean  cond;
+          gchar    *value;
+
+          cond = gimp_prop_eval_boolean_or (config, pspec,
+                                            expr, t, error, depth + 1);
+
+          if (*error)
+            break;
+
+          if (g_strcmp0 (*t, ":"))
+            {
+              g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                           "missing string selection value");
+
+              break;
+            }
+
+          gimp_prop_eval_read_token (expr, t, error);
+
+          if (*error)
+            break;
+
+          value = gimp_prop_eval_string_selection (config, pspec,
+                                                   expr, t, error, depth + 1);
+
+          if (*error)
+            break;
+
+          if (! match && cond)
+            {
+              match  = TRUE;
+              result = value;
+            }
+
+          if (! g_strcmp0 (*t, ","))
+            {
+              gimp_prop_eval_read_token (expr, t, error);
+
+              continue;
+            }
+          else if (! g_strcmp0 (*t, "]"))
+            {
+              gimp_prop_eval_read_token (expr, t, error);
+
+              break;
+            }
+          else
+            {
+              if (*t)
+                {
+                  g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                               "invalid string selection");
+                }
+              else
+                {
+                  g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                               "unterminated string selection");
+                }
+
+              break;
+            }
+        }
+
+      if (*error)
+        {
+          g_free (result);
+
+          return NULL;
+        }
+
+      return result;
+    }
+
+  return gimp_prop_eval_string_simple (config,
+                                       pspec, expr, t, error, depth);
+}
+
+static gchar *
+gimp_prop_eval_string_simple (GObject      *config,
+                              GParamSpec   *pspec,
+                              const gchar **expr,
+                              gchar       **t,
+                              GError      **error,
+                              gint          depth)
+{
+  gchar *result = NULL;
+
+  if (! gimp_prop_eval_depth_test (depth, error))
+    return NULL;
+
+  /* literal */
+  if (*t && **t == '\'')
+    {
+      gchar *escaped;
+
+      escaped = g_strndup (*t + 1, strlen (*t + 1) - 1);
+
+      result = g_strcompress (escaped);
+
+      g_free (escaped);
+
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        {
+          g_free (result);
+
+          return NULL;
+        }
+    }
+  /* reference */
+  else if (! g_strcmp0 (*t, "$"))
+    {
+      gchar *key;
+
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        return NULL;
+
+      if (! gimp_prop_eval_parse_reference (config, pspec,
+                                            expr, t, error, &pspec, &key))
+        return NULL;
+
+      result = gimp_prop_eval_string_impl (config, pspec,
+                                           key, NULL, error, depth + 1);
+
+      g_free (key);
+    }
+  /* deferred literal */
+  else if (gimp_prop_eval_is_name (*t))
+    {
+      GParamSpec  *str_pspec;
+      gchar       *str_key;
+      const gchar *str;
+
+      if (! gimp_prop_eval_parse_reference (config, pspec,
+                                            expr, t, error,
+                                            &str_pspec, &str_key))
+        return NULL;
+
+      str = gegl_param_spec_get_property_key (str_pspec, str_key);
+
+      if (! str)
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "key '%s' of property '%s' not found",
+                       str_key,
+                       g_param_spec_get_name (str_pspec));
+
+          g_free (str_key);
+
+          return NULL;
+        }
+
+      g_free (str_key);
+
+      result = g_strdup (str);
+    }
+  else
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "invalid expression");
+
+      return NULL;
+    }
+
+  return result;
+}
+
+static gboolean
+gimp_prop_eval_parse_reference (GObject      *config,
+                                GParamSpec   *pspec,
+                                const gchar **expr,
+                                gchar       **t,
+                                GError      **error,
+                                GParamSpec  **ref_pspec,
+                                gchar       **ref_key)
+{
+  if (! gimp_prop_eval_is_name (*t))
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "invalid reference");
+
+      return FALSE;
+    }
+
+  *ref_pspec = pspec;
+  *ref_key   = g_strdup (*t);
+
+  gimp_prop_eval_read_token (expr, t, error);
+
+  if (*error)
+    {
+      g_free (*ref_key);
+
+      return FALSE;
+    }
+
+  if (! g_strcmp0 (*t, "."))
+    {
+      gchar *property_name;
+
+      property_name = *ref_key;
+
+      if (! gimp_prop_eval_read_token (expr, t, error) ||
+          ! gimp_prop_eval_is_name (*t))
+        {
+          if (! *error)
+            {
+              g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                           "invalid reference");
+            }
+
+          g_free (property_name);
+
+          return FALSE;
+        }
+
+      *ref_pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (config),
+                                                 property_name);
+
+      if (! *ref_pspec)
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "property '%s' not found",
+                       property_name);
+
+          g_free (property_name);
+
+          return FALSE;
+        }
+
+      g_free (property_name);
+
+      *ref_key = g_strdup (*t);
+
+      gimp_prop_eval_read_token (expr, t, error);
+
+      if (*error)
+        {
+          g_free (*ref_key);
+
+          return FALSE;
+        }
+    }
+
+  return TRUE;
+}
+
+static gboolean
+gimp_prop_eval_depth_test (gint     depth,
+                           GError **error)
+{
+  /* make sure we don't recurse too deep.  in particular, guard against
+   * circular references.
+   */
+  if (depth == 100)
+    {
+      g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                   "maximal nesting level exceeded");
+
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+static gchar *
+gimp_prop_eval_read_token (const gchar **expr,
+                           gchar       **t,
+                           GError      **error)
+{
+  const gchar *token;
+
+  g_free (*t);
+  *t = NULL;
+
+  /* skip whitespace */
+  while (g_ascii_isspace (**expr))
+    ++*expr;
+
+  token = *expr;
+
+  if (*token == '\0')
+    return NULL;
+
+  /* name */
+  if (gimp_prop_eval_is_name (token))
+    {
+      do { ++*expr; } while (g_ascii_isalnum (**expr) ||
+                             **expr == '_'            ||
+                             **expr == '-');
+    }
+  /* string literal */
+  else if (token[0] == '\'')
+    {
+      for (++*expr; **expr != '\0' && **expr != '\''; ++*expr)
+        {
+          if (**expr == '\\')
+            {
+              ++*expr;
+
+              if (**expr == '\0')
+                break;
+            }
+        }
+
+      if (**expr == '\0')
+        {
+          g_set_error (error, GIMP_PROP_EVAL_ERROR, GIMP_PROP_EVAL_FAILED,
+                       "unterminated string literal");
+
+          return NULL;
+        }
+
+      ++*expr;
+    }
+  /* punctuation or boolean literal */
+  else
+    {
+      ++*expr;
+    }
+
+  *t = g_strndup (token, *expr - token);
+
+  return *t;
+}
+
+static gboolean
+gimp_prop_eval_is_name (const gchar *token)
+{
+  return token && (g_ascii_isalpha (*token) || *token == '_');
+}
+
+static GQuark
+gimp_prop_eval_error_quark (void)
+{
+  return g_quark_from_static_string ("gimp-prop-eval-error-quark");
+}
diff --git a/app/propgui/gimppropgui-eval.h b/app/propgui/gimppropgui-eval.h
new file mode 100644
index 0000000..e2b8708
--- /dev/null
+++ b/app/propgui/gimppropgui-eval.h
@@ -0,0 +1,36 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui.h
+ * Copyright (C) 2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_PROP_GUI_EVAL_H__
+#define __GIMP_PROP_GUI_EVAL_H__
+
+
+gboolean   gimp_prop_eval_boolean (GObject     *config,
+                                   GParamSpec  *pspec,
+                                   const gchar *key,
+                                   gboolean     default_value);
+
+gchar    * gimp_prop_eval_string  (GObject     *config,
+                                   GParamSpec  *pspec,
+                                   const gchar *key,
+                                   const gchar *default_value);
+
+
+#endif /* __GIMP_PROP_GUI_EVAL_H__ */
diff --git a/app/propgui/gimppropgui-focus-blur.c b/app/propgui/gimppropgui-focus-blur.c
new file mode 100644
index 0000000..ecee097
--- /dev/null
+++ b/app/propgui/gimppropgui-focus-blur.c
@@ -0,0 +1,246 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-focus-blur.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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-focus-blur.h"
+
+#include "gimp-intl.h"
+
+
+static gint
+find_param (GParamSpec  **param_specs,
+            guint         n_param_specs,
+            const gchar  *name)
+{
+  gint i;
+
+  for (i = 0; i < n_param_specs; i++)
+    {
+      if (! strcmp (param_specs[i]->name, name))
+        break;
+    }
+
+  return i;
+}
+
+static void
+focus_callback (GObject       *config,
+                GeglRectangle *area,
+                GimpLimitType  type,
+                gdouble        x,
+                gdouble        y,
+                gdouble        radius,
+                gdouble        aspect_ratio,
+                gdouble        angle,
+                gdouble        inner_limit,
+                gdouble        midpoint)
+{
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  g_object_set (config,
+                "shape",        type,
+                "x",            x / area->width,
+                "y",            y / area->height,
+                "radius",       2.0 * radius / area->width,
+                "focus",        inner_limit,
+                "midpoint",     midpoint,
+                "aspect-ratio", aspect_ratio,
+                "rotation",     fmod (
+                                  fmod (angle * 180.0 / G_PI + 180.0, 360.0) +
+                                  360.0,
+                                  360.0) - 180.0,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerFocusCallback  set_func;
+  GeglRectangle               *area;
+  GimpLimitType                shape;
+  gdouble                      radius;
+  gdouble                      focus;
+  gdouble                      midpoint;
+  gdouble                      x, y;
+  gdouble                      aspect_ratio;
+  gdouble                      rotation;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "shape",        &shape,
+                "radius",       &radius,
+                "focus",        &focus,
+                "midpoint",     &midpoint,
+                "x",            &x,
+                "y",            &y,
+                "aspect-ratio", &aspect_ratio,
+                "rotation",     &rotation,
+                NULL);
+
+  set_func (set_data, area,
+            shape,
+            x * area->width,
+            y * area->height,
+            radius * area->width / 2.0,
+            aspect_ratio,
+            rotation / 180.0 * G_PI,
+            focus,
+            midpoint);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_focus_blur (GObject                  *config,
+                               GParamSpec              **param_specs,
+                               guint                     n_param_specs,
+                               GeglRectangle            *area,
+                               GimpContext              *context,
+                               GimpCreatePickerFunc      create_picker_func,
+                               GimpCreateControllerFunc  create_controller_func,
+                               gpointer                  creator)
+{
+  GtkWidget *vbox;
+  gint       first_geometry_param;
+  gint       last_geometry_param;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  first_geometry_param = find_param (param_specs, n_param_specs,
+                                     "shape") + 1;
+  last_geometry_param  = find_param (param_specs, n_param_specs,
+                                     "high-quality");
+
+  if (last_geometry_param <= first_geometry_param)
+    {
+      vbox = _gimp_prop_gui_new_generic (config,
+                                         param_specs, n_param_specs,
+                                         area, context,
+                                         create_picker_func,
+                                         create_controller_func,
+                                         creator);
+    }
+  else
+    {
+      GtkWidget   *widget;
+      GtkWidget   *expander;
+      GtkWidget   *frame;
+      const gchar *label;
+
+      vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+
+      widget = gimp_prop_widget_new (config,
+                                     "shape",
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator,
+                                     &label);
+      gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, FALSE, 0);
+      gtk_widget_show (widget);
+
+      widget = _gimp_prop_gui_new_generic (config,
+                                           param_specs,
+                                           first_geometry_param - 1,
+                                           area, context,
+                                           create_picker_func,
+                                           create_controller_func,
+                                           creator);
+      gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, FALSE, 0);
+      gtk_widget_show (widget);
+
+      widget = _gimp_prop_gui_new_generic (config,
+                                           param_specs + last_geometry_param,
+                                           n_param_specs - last_geometry_param,
+                                           area, context,
+                                           create_picker_func,
+                                           create_controller_func,
+                                           creator);
+      gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, FALSE, 0);
+      gtk_widget_show (widget);
+
+      expander = gtk_expander_new (_("Geometry Options"));
+      gtk_box_pack_start (GTK_BOX (vbox), expander, FALSE, FALSE, 0);
+      gtk_widget_show (expander);
+
+      frame = gimp_frame_new (NULL);
+      gtk_container_add (GTK_CONTAINER (expander), frame);
+      gtk_widget_show (frame);
+
+      widget = _gimp_prop_gui_new_generic (config,
+                                           param_specs + first_geometry_param,
+                                           last_geometry_param -
+                                           first_geometry_param,
+                                           area, context,
+                                           create_picker_func,
+                                           create_controller_func,
+                                           creator);
+      gtk_container_add (GTK_CONTAINER (frame), widget);
+      gtk_widget_show (widget);
+    }
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_FOCUS,
+                                         _("Focus Blur: "),
+                                         (GCallback) focus_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
+
diff --git a/app/propgui/gimppropgui-focus-blur.h b/app/propgui/gimppropgui-focus-blur.h
new file mode 100644
index 0000000..1c0c0c7
--- /dev/null
+++ b/app/propgui/gimppropgui-focus-blur.h
@@ -0,0 +1,36 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-focus-blur.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 <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_PROP_GUI_FOCUS_BLUR_H__
+#define __GIMP_PROP_GUI_FOCUS_BLUR_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_focus_blur (GObject                  *config,
+                               GParamSpec              **param_specs,
+                               guint                     n_param_specs,
+                               GeglRectangle            *area,
+                               GimpContext              *context,
+                               GimpCreatePickerFunc      create_picker_func,
+                               GimpCreateControllerFunc  create_controller_func,
+                               gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_FOCUS_BLUR_H__ */
diff --git a/app/propgui/gimppropgui-generic.c b/app/propgui/gimppropgui-generic.c
new file mode 100644
index 0000000..a7c7e89
--- /dev/null
+++ b/app/propgui/gimppropgui-generic.c
@@ -0,0 +1,377 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-generic.c
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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 <stdlib.h>
+
+#include <gegl.h>
+#include <gegl-paramspecs.h>
+#include <gtk/gtk.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimpcontext.h"
+
+#include "widgets/gimppropwidgets.h"
+#include "widgets/gimpspinscale.h"
+#include "widgets/gimpwidgets-utils.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+
+#include "gimp-intl.h"
+
+
+#define HAS_KEY(p,k,v) gimp_gegl_param_spec_has_key (p, k, v)
+
+
+static void   gimp_prop_gui_chain_toggled (GimpChainButton *chain,
+                                           GtkAdjustment   *x_adj);
+
+
+/*  public functions  */
+
+GtkWidget *
+_gimp_prop_gui_new_generic (GObject                  *config,
+                            GParamSpec              **param_specs,
+                            guint                     n_param_specs,
+                            GeglRectangle            *area,
+                            GimpContext              *context,
+                            GimpCreatePickerFunc      create_picker_func,
+                            GimpCreateControllerFunc  create_controller_func,
+                            gpointer                  creator)
+{
+  GtkWidget    *main_vbox;
+  GtkSizeGroup *label_group;
+  GList        *chains = NULL;
+  gint          i;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+
+  label_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
+
+  for (i = 0; i < n_param_specs; i++)
+    {
+      GParamSpec  *pspec      = param_specs[i];
+      GParamSpec  *next_pspec = NULL;
+
+      if (i < n_param_specs - 1)
+        next_pspec = param_specs[i + 1];
+
+      if (next_pspec                        &&
+          HAS_KEY (pspec,      "axis", "x") &&
+          HAS_KEY (next_pspec, "axis", "y"))
+        {
+          GtkWidget     *widget_x;
+          GtkWidget     *widget_y;
+          const gchar   *label_x;
+          const gchar   *label_y;
+          GtkAdjustment *adj_x;
+          GtkAdjustment *adj_y;
+          GtkWidget     *hbox;
+          GtkWidget     *vbox;
+          GtkWidget     *chain;
+
+          i++;
+
+          widget_x = gimp_prop_widget_new_from_pspec (config, pspec,
+                                                      area, context,
+                                                      create_picker_func,
+                                                      create_controller_func,
+                                                      creator,
+                                                      &label_x);
+          widget_y = gimp_prop_widget_new_from_pspec (config, next_pspec,
+                                                      area, context,
+                                                      create_picker_func,
+                                                      create_controller_func,
+                                                      creator,
+                                                      &label_y);
+
+          adj_x = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (widget_x));
+          adj_y = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (widget_y));
+
+          hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+          gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
+          gtk_widget_show (hbox);
+
+          gimp_prop_gui_bind_container (widget_x, hbox);
+
+          vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+          gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
+          gtk_widget_show (vbox);
+
+          gtk_box_pack_start (GTK_BOX (vbox), widget_x, FALSE, FALSE, 0);
+          gtk_widget_show (widget_x);
+
+          gtk_box_pack_start (GTK_BOX (vbox), widget_y, FALSE, FALSE, 0);
+          gtk_widget_show (widget_y);
+
+          chain = gimp_chain_button_new (GIMP_CHAIN_RIGHT);
+          gtk_box_pack_end (GTK_BOX (hbox), chain, FALSE, FALSE, 0);
+          gtk_widget_show (chain);
+
+          if (! HAS_KEY (pspec, "unit", "pixel-coordinate")    &&
+              ! HAS_KEY (pspec, "unit", "relative-coordinate") &&
+              gtk_adjustment_get_value (adj_x) ==
+              gtk_adjustment_get_value (adj_y))
+            {
+              GBinding *binding;
+
+              gimp_chain_button_set_active (GIMP_CHAIN_BUTTON (chain), TRUE);
+
+              binding = g_object_bind_property (adj_x, "value",
+                                                adj_y, "value",
+                                                G_BINDING_BIDIRECTIONAL);
+
+              g_object_set_data (G_OBJECT (chain), "binding", binding);
+            }
+
+          g_object_set_data_full (G_OBJECT (chain), "x-property",
+                                  g_strdup (pspec->name), g_free);
+          g_object_set_data_full (G_OBJECT (chain), "y-property",
+                                  g_strdup (next_pspec->name), g_free);
+
+          chains = g_list_prepend (chains, chain);
+
+          g_signal_connect (chain, "toggled",
+                            G_CALLBACK (gimp_prop_gui_chain_toggled),
+                            adj_x);
+
+          g_object_set_data (G_OBJECT (adj_x), "y-adjustment", adj_y);
+
+          if (create_picker_func &&
+              (HAS_KEY (pspec, "unit", "pixel-coordinate") ||
+               HAS_KEY (pspec, "unit", "relative-coordinate")))
+            {
+              GtkWidget *button;
+              gchar     *pspec_name;
+
+              pspec_name = g_strconcat (pspec->name, ":",
+                                        next_pspec->name, NULL);
+
+              button = create_picker_func (creator,
+                                           pspec_name,
+                                           GIMP_ICON_CURSOR,
+                                           _("Pick coordinates from the image"),
+                                           /* pick_abyss = */ TRUE,
+                                           NULL, NULL);
+              gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+              gtk_widget_show (button);
+
+              g_object_weak_ref (G_OBJECT (button),
+                                 (GWeakNotify) g_free, pspec_name);
+            }
+        }
+      else if (next_pspec                                  &&
+               HAS_KEY (pspec,      "role", "range-start") &&
+               HAS_KEY (next_pspec, "role", "range-end")   &&
+               HAS_KEY (pspec,      "unit", "luminance"))
+        {
+          GtkWidget   *vbox;
+          GtkWidget   *spin_scale;
+          GtkWidget   *label;
+          GtkWidget   *frame;
+          GtkWidget   *range;
+          const gchar *label_str;
+          const gchar *range_label_str;
+          gdouble      step_increment;
+          gdouble      page_increment;
+          gdouble      ui_lower;
+          gdouble      ui_upper;
+
+          i++;
+
+          vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+          gtk_box_pack_start (GTK_BOX (main_vbox), vbox, FALSE, FALSE, 0);
+
+          spin_scale = gimp_prop_widget_new_from_pspec (
+            config, pspec,
+            area, context,
+            create_picker_func,
+            create_controller_func,
+            creator,
+            &label_str);
+          gtk_widget_show (spin_scale);
+
+          g_object_set_data_full (G_OBJECT (vbox),
+                                  "gimp-underlying-widget",
+                                  g_object_ref_sink (spin_scale),
+                                  g_object_unref);
+
+          range_label_str = gegl_param_spec_get_property_key (pspec,
+                                                              "range-label");
+
+          if (range_label_str)
+            label_str = range_label_str;
+
+          gtk_spin_button_get_increments (GTK_SPIN_BUTTON (spin_scale),
+                                          &step_increment, &page_increment);
+
+          gimp_spin_scale_get_scale_limits (GIMP_SPIN_SCALE (spin_scale),
+                                            &ui_lower, &ui_upper);
+
+          label = gtk_label_new_with_mnemonic (label_str);
+          gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+          gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+          gtk_widget_show (label);
+
+          if (! range_label_str)
+            {
+              g_object_bind_property (spin_scale, "label",
+                                      label,      "label",
+                                      G_BINDING_SYNC_CREATE);
+            }
+
+          frame = gimp_frame_new (NULL);
+          gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+          gtk_widget_show (frame);
+
+          range = gimp_prop_range_new (config,
+                                       pspec->name, next_pspec->name,
+                                       step_increment, page_increment,
+                                       gtk_spin_button_get_digits (
+                                         GTK_SPIN_BUTTON (spin_scale)),
+                                       ! HAS_KEY (pspec,
+                                                  "range-sorted", "false"));
+          gimp_prop_range_set_ui_limits (range, ui_lower, ui_upper);
+          gtk_container_add (GTK_CONTAINER (frame), range);
+          gtk_widget_show (range);
+
+          gimp_prop_gui_bind_container (spin_scale, vbox);
+          gimp_prop_gui_bind_tooltip   (spin_scale, vbox);
+        }
+      else
+        {
+          GtkWidget   *widget;
+          const gchar *label;
+          gboolean     expand = FALSE;
+
+          widget = gimp_prop_widget_new_from_pspec (config, pspec,
+                                                    area, context,
+                                                    create_picker_func,
+                                                    create_controller_func,
+                                                    creator,
+                                                    &label);
+
+          if (GTK_IS_SCROLLED_WINDOW (widget))
+            expand = TRUE;
+
+          if (widget && label)
+            {
+              GtkWidget *l;
+
+              l = gtk_label_new_with_mnemonic (label);
+              gtk_label_set_xalign (GTK_LABEL (l), 0.0);
+              gtk_widget_show (l);
+
+              gimp_prop_gui_bind_label (widget, l);
+
+              if (GTK_IS_SCROLLED_WINDOW (widget))
+                {
+                  GtkWidget *frame;
+
+                  /* don't set as frame title, it should not be bold */
+                  gtk_box_pack_start (GTK_BOX (main_vbox), l, FALSE, FALSE, 0);
+
+                  frame = gimp_frame_new (NULL);
+                  gtk_box_pack_start (GTK_BOX (main_vbox), frame, TRUE, TRUE, 0);
+                  gtk_widget_show (frame);
+
+                  gtk_container_add (GTK_CONTAINER (frame), widget);
+                  gtk_widget_show (widget);
+
+                  gimp_prop_gui_bind_container (widget, frame);
+                }
+              else
+                {
+                  GtkWidget *hbox;
+
+                  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+                  gtk_box_pack_start (GTK_BOX (main_vbox), hbox,
+                                      expand, expand, 0);
+                  gtk_widget_show (hbox);
+
+                  gtk_size_group_add_widget (label_group, l);
+                  gtk_box_pack_start (GTK_BOX (hbox), l, FALSE, FALSE, 0);
+
+                  gtk_box_pack_start (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
+                  gtk_widget_show (widget);
+
+                  gimp_prop_gui_bind_container (widget, hbox);
+                }
+            }
+          else if (widget)
+            {
+              gtk_box_pack_start (GTK_BOX (main_vbox), widget,
+                                  expand, expand, 0);
+              gtk_widget_show (widget);
+            }
+        }
+    }
+
+  g_object_unref (label_group);
+
+  g_object_set_data_full (G_OBJECT (main_vbox), "chains", chains,
+                          (GDestroyNotify) g_list_free);
+
+  return main_vbox;
+}
+
+
+/*  private functions  */
+
+static void
+gimp_prop_gui_chain_toggled (GimpChainButton *chain,
+                             GtkAdjustment   *x_adj)
+{
+  GBinding      *binding;
+  GtkAdjustment *y_adj;
+
+  binding = g_object_get_data (G_OBJECT (chain), "binding");
+  y_adj   = g_object_get_data (G_OBJECT (x_adj), "y-adjustment");
+
+  if (gimp_chain_button_get_active (chain))
+    {
+      if (! binding)
+        binding = g_object_bind_property (x_adj, "value",
+                                          y_adj, "value",
+                                          G_BINDING_BIDIRECTIONAL);
+    }
+  else
+    {
+      g_clear_object (&binding);
+    }
+  g_object_set_data (G_OBJECT (chain), "binding", binding);
+}
diff --git a/app/propgui/gimppropgui-generic.h b/app/propgui/gimppropgui-generic.h
new file mode 100644
index 0000000..40e5269
--- /dev/null
+++ b/app/propgui/gimppropgui-generic.h
@@ -0,0 +1,36 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-generic.h
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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_PROP_GUI_GENERIC_H__
+#define __GIMP_PROP_GUI_GENERIC_H__
+
+
+GtkWidget * _gimp_prop_gui_new_generic (GObject                  *config,
+                                        GParamSpec              **param_specs,
+                                        guint                     n_param_specs,
+                                        GeglRectangle            *area,
+                                        GimpContext              *context,
+                                        GimpCreatePickerFunc      create_picker_func,
+                                        GimpCreateControllerFunc  create_controller_func,
+                                        gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_GENERIC_H__ */
diff --git a/app/propgui/gimppropgui-hue-saturation.c b/app/propgui/gimppropgui-hue-saturation.c
new file mode 100644
index 0000000..df96202
--- /dev/null
+++ b/app/propgui/gimppropgui-hue-saturation.c
@@ -0,0 +1,288 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-hue-saturation.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 <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "operations/gimphuesaturationconfig.h"
+#include "operations/gimpoperationhuesaturation.h"
+
+#include "core/gimpcontext.h"
+
+#include "widgets/gimppropwidgets.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-hue-saturation.h"
+
+#include "gimp-intl.h"
+
+
+#define COLOR_WIDTH  40
+#define COLOR_HEIGHT 20
+
+
+static void
+hue_saturation_config_notify (GObject          *object,
+                              const GParamSpec *pspec,
+                              GtkWidget        *color_area)
+{
+  GimpHueSaturationConfig *config = GIMP_HUE_SATURATION_CONFIG (object);
+  GimpHueRange             range;
+  GimpRGB                  color;
+
+  static const GimpRGB default_colors[7] =
+  {
+    {   0,   0,   0, },
+    { 1.0,   0,   0, },
+    { 1.0, 1.0,   0, },
+    {   0, 1.0,   0, },
+    {   0, 1.0, 1.0, },
+    {   0,   0, 1.0, },
+    { 1.0,   0, 1.0, }
+  };
+
+  range = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (color_area),
+                                              "hue-range"));
+  color = default_colors[range];
+
+  gimp_operation_hue_saturation_map (config, &color, range, &color);
+
+  gimp_color_area_set_color (GIMP_COLOR_AREA (color_area), &color);
+}
+
+static void
+hue_saturation_range_callback (GtkWidget *widget,
+                               GObject   *config)
+{
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
+    {
+      GimpHueRange range;
+
+      gimp_radio_button_update (widget, &range);
+      g_object_set (config,
+                    "range", range,
+                    NULL);
+    }
+}
+
+static void
+hue_saturation_range_notify (GObject          *object,
+                             const GParamSpec *pspec,
+                             GtkWidget        *range_radio)
+{
+  GimpHueSaturationConfig *config = GIMP_HUE_SATURATION_CONFIG (object);
+
+  gimp_int_radio_group_set_active (GTK_RADIO_BUTTON (range_radio),
+                                   config->range);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_hue_saturation (GObject                  *config,
+                                   GParamSpec              **param_specs,
+                                   guint                     n_param_specs,
+                                   GeglRectangle            *area,
+                                   GimpContext              *context,
+                                   GimpCreatePickerFunc      create_picker_func,
+                                   GimpCreateControllerFunc  create_controller_func,
+                                   gpointer                  creator)
+{
+  GtkWidget *main_vbox;
+  GtkWidget *frame;
+  GtkWidget *vbox;
+  GtkWidget *abox;
+  GtkWidget *table;
+  GtkWidget *scale;
+  GtkWidget *button;
+  GtkWidget *hbox;
+  GtkWidget *range_radio;
+  GSList    *group = NULL;
+  gint       i;
+
+  const struct
+  {
+    const gchar *label;
+    const gchar *tooltip;
+    gint         label_col;
+    gint         label_row;
+    gint         frame_col;
+    gint         frame_row;
+  }
+  hue_range_table[] =
+  {
+    { N_("M_aster"), N_("Adjust all colors"), 2, 3, 0, 0 },
+    { N_("_R"),      N_("Red"),               2, 1, 2, 0 },
+    { N_("_Y"),      N_("Yellow"),            1, 2, 0, 2 },
+    { N_("_G"),      N_("Green"),             1, 4, 0, 4 },
+    { N_("_C"),      N_("Cyan"),              2, 5, 2, 6 },
+    { N_("_B"),      N_("Blue"),              3, 4, 4, 4 },
+    { N_("_M"),      N_("Magenta"),           3, 2, 4, 2 }
+  };
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  frame = gimp_frame_new (_("Select Primary Color to Adjust"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, TRUE, TRUE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  abox = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
+  gtk_box_pack_start (GTK_BOX (vbox), abox, TRUE, TRUE, 0);
+  gtk_widget_show (abox);
+
+  /*  The table containing hue ranges  */
+  table = gtk_table_new (7, 5, FALSE);
+  gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
+  gtk_table_set_col_spacing (GTK_TABLE (table), 3, 4);
+  gtk_table_set_row_spacing (GTK_TABLE (table), 0, 2);
+  gtk_table_set_row_spacing (GTK_TABLE (table), 5, 2);
+  gtk_container_add (GTK_CONTAINER (abox), table);
+
+  /*  the radio buttons for hue ranges  */
+  for (i = 0; i < G_N_ELEMENTS (hue_range_table); i++)
+    {
+      button = gtk_radio_button_new_with_mnemonic (group,
+                                                   gettext (hue_range_table[i].label));
+      group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (button));
+      g_object_set_data (G_OBJECT (button), "gimp-item-data",
+                         GINT_TO_POINTER (i));
+
+      gimp_help_set_help_data (button,
+                               gettext (hue_range_table[i].tooltip),
+                               NULL);
+
+      if (i == 0)
+        {
+          gtk_toggle_button_set_mode (GTK_TOGGLE_BUTTON (button), FALSE);
+
+          range_radio = button;
+        }
+
+      gtk_table_attach (GTK_TABLE (table), button,
+                        hue_range_table[i].label_col,
+                        hue_range_table[i].label_col + 1,
+                        hue_range_table[i].label_row,
+                        hue_range_table[i].label_row + 1,
+                        GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+
+      if (i > 0)
+        {
+          GtkWidget *color_area;
+          GimpRGB    color = { 0, };
+
+          frame = gtk_frame_new (NULL);
+          gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
+          gtk_table_attach (GTK_TABLE (table), frame,
+                            hue_range_table[i].frame_col,
+                            hue_range_table[i].frame_col + 1,
+                            hue_range_table[i].frame_row,
+                            hue_range_table[i].frame_row + 1,
+                            GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+          gtk_widget_show (frame);
+
+          color_area = gimp_color_area_new (&color, GIMP_COLOR_AREA_FLAT, 0);
+          gtk_widget_set_size_request (color_area, COLOR_WIDTH, COLOR_HEIGHT);
+          gtk_container_add (GTK_CONTAINER (frame), color_area);
+          gtk_widget_show (color_area);
+
+          g_object_set_data (G_OBJECT (color_area), "hue-range",
+                             GINT_TO_POINTER (i));
+          g_signal_connect_object (config, "notify",
+                                   G_CALLBACK (hue_saturation_config_notify),
+                                   color_area, 0);
+          hue_saturation_config_notify (config, NULL, color_area);
+        }
+
+      g_signal_connect (button, "toggled",
+                        G_CALLBACK (hue_saturation_range_callback),
+                        config);
+
+      gtk_widget_show (button);
+    }
+
+  gtk_widget_show (table);
+
+  /* Create the 'Overlap' option slider */
+  scale = gimp_prop_spin_scale_new (config, "overlap",
+                                    _("_Overlap"), 0.01, 0.1, 0);
+  gimp_prop_widget_set_factor (scale, 100.0, 0.0, 0.0, 1);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  frame = gimp_frame_new (_("Adjust Selected Color"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  /*  Create the hue scale widget  */
+  scale = gimp_prop_spin_scale_new (config, "hue",
+                                    _("_Hue"), 1.0 / 180.0, 15.0 / 180.0, 0);
+  gimp_prop_widget_set_factor (scale, 180.0, 0.0, 0.0, 1);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  /*  Create the lightness scale widget  */
+  scale = gimp_prop_spin_scale_new (config, "lightness",
+                                    _("_Lightness"), 0.01, 0.1, 0);
+  gimp_prop_widget_set_factor (scale, 100.0, 0.0, 0.0, 1);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  /*  Create the saturation scale widget  */
+  scale = gimp_prop_spin_scale_new (config, "saturation",
+                                    _("_Saturation"), 0.01, 0.1, 0);
+  gimp_prop_widget_set_factor (scale, 100.0, 0.0, 0.0, 1);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  button = gtk_button_new_with_mnemonic (_("R_eset Color"));
+  gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect_swapped (button, "clicked",
+                            G_CALLBACK (gimp_hue_saturation_config_reset_range),
+                            config);
+
+  g_signal_connect_object (config, "notify::range",
+                           G_CALLBACK (hue_saturation_range_notify),
+                           range_radio, 0);
+  hue_saturation_range_notify (config, NULL, range_radio);
+
+  return main_vbox;
+}
diff --git a/app/propgui/gimppropgui-hue-saturation.h b/app/propgui/gimppropgui-hue-saturation.h
new file mode 100644
index 0000000..efeca87
--- /dev/null
+++ b/app/propgui/gimppropgui-hue-saturation.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-hue-saturation.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_PROP_GUI_HUE_SATURATION_H__
+#define __GIMP_PROP_GUI_HUE_SATURATION_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_hue_saturation (GObject                  *config,
+                                   GParamSpec              **param_specs,
+                                   guint                     n_param_specs,
+                                   GeglRectangle            *area,
+                                   GimpContext              *context,
+                                   GimpCreatePickerFunc      create_picker_func,
+                                   GimpCreateControllerFunc  create_controller_func,
+                                   gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_HUE_SATURATION_H__ */
diff --git a/app/propgui/gimppropgui-motion-blur-circular.c b/app/propgui/gimppropgui-motion-blur-circular.c
new file mode 100644
index 0000000..a008ef1
--- /dev/null
+++ b/app/propgui/gimppropgui-motion-blur-circular.c
@@ -0,0 +1,151 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-motion-blur-circular.c
+ * Copyright (C) 2019  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui-generic.h"
+#include "gimppropgui-motion-blur-circular.h"
+
+#include "gimp-intl.h"
+
+
+static void
+line_callback (GObject       *config,
+               GeglRectangle *area,
+               gdouble        x1,
+               gdouble        y1,
+               gdouble        x2,
+               gdouble        y2)
+{
+  gdouble x, y;
+  gdouble angle;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  x     = x1 / area->width;
+  y     = y1 / area->height;
+  angle = atan2 (-(y2 - y1), x2 - x1);
+
+  angle = angle * 180.0 / G_PI;
+
+  if (angle < 0)
+    angle += 360.0;
+
+  g_object_set (config,
+                "center-x", x,
+                "center-y", y,
+                "angle",    angle,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerLineCallback  set_func;
+  GeglRectangle              *area;
+  gdouble                     x, y;
+  gdouble                     angle;
+  gdouble                     x1, y1, x2, y2;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "center-x", &x,
+                "center-y", &y,
+                "angle",    &angle,
+                NULL);
+
+  angle = angle / 180.0 * G_PI;
+
+  x1 = x * area->width;
+  y1 = y * area->height;
+  x2 = x1 + cos (angle) * 100;
+  y2 = y1 - sin (angle) * 100;
+
+  set_func (set_data, area, x1, y1, x2, y2);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_motion_blur_circular (GObject                  *config,
+                                         GParamSpec              **param_specs,
+                                         guint                     n_param_specs,
+                                         GeglRectangle            *area,
+                                         GimpContext              *context,
+                                         GimpCreatePickerFunc      create_picker_func,
+                                         GimpCreateControllerFunc  create_controller_func,
+                                         gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_LINE,
+                                         _("Circular Motion Blur: "),
+                                         (GCallback) line_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-motion-blur-circular.h b/app/propgui/gimppropgui-motion-blur-circular.h
new file mode 100644
index 0000000..3bb851e
--- /dev/null
+++ b/app/propgui/gimppropgui-motion-blur-circular.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-motion-blur-circular.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_PROP_GUI_MOTION_BLUR_CIRCULAR_H__
+#define __GIMP_PROP_GUI_MOTION_BLUR_CIRCULAR_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_motion_blur_circular (GObject                  *config,
+                                         GParamSpec              **param_specs,
+                                         guint                     n_param_specs,
+                                         GeglRectangle            *area,
+                                         GimpContext              *context,
+                                         GimpCreatePickerFunc      create_picker_func,
+                                         GimpCreateControllerFunc  create_controller_func,
+                                         gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_MOTION_BLUR_CIRCULAR_H__ */
diff --git a/app/propgui/gimppropgui-motion-blur-linear.c b/app/propgui/gimppropgui-motion-blur-linear.c
new file mode 100644
index 0000000..ed917aa
--- /dev/null
+++ b/app/propgui/gimppropgui-motion-blur-linear.c
@@ -0,0 +1,145 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-motion-blur-linear.c
+ * Copyright (C) 2019  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui-generic.h"
+#include "gimppropgui-motion-blur-linear.h"
+
+#include "gimp-intl.h"
+
+
+static void
+line_callback (GObject       *config,
+               GeglRectangle *area,
+               gdouble        x1,
+               gdouble        y1,
+               gdouble        x2,
+               gdouble        y2)
+{
+  gdouble length;
+  gdouble angle;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  length = sqrt (SQR (x2 - x1) + SQR (y2 - y1));
+  angle  = atan2 (y2 - y1, x2 - x1);
+
+  angle = angle / G_PI * 180.0;
+
+  g_object_set (config,
+                "length", length,
+                "angle",  angle,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerLineCallback  set_func;
+  GeglRectangle              *area;
+  gdouble                     length;
+  gdouble                     angle;
+  gdouble                     x1, y1, x2, y2;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "length", &length,
+                "angle",  &angle,
+                NULL);
+
+  angle = angle / 180.0 * G_PI;
+
+  x1 = area->x + area->width  / 2.0;
+  y1 = area->x + area->height / 2.0;
+  x2 = x1 + cos (angle) * length;
+  y2 = y1 + sin (angle) * length;
+
+  set_func (set_data, area, x1, y1, x2, y2);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_motion_blur_linear (GObject                  *config,
+                                       GParamSpec              **param_specs,
+                                       guint                     n_param_specs,
+                                       GeglRectangle            *area,
+                                       GimpContext              *context,
+                                       GimpCreatePickerFunc      create_picker_func,
+                                       GimpCreateControllerFunc  create_controller_func,
+                                       gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_LINE,
+                                         _("Linear Motion Blur: "),
+                                         (GCallback) line_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-motion-blur-linear.h b/app/propgui/gimppropgui-motion-blur-linear.h
new file mode 100644
index 0000000..aacb528
--- /dev/null
+++ b/app/propgui/gimppropgui-motion-blur-linear.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-motion-blur-linear.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_PROP_GUI_MOTION_BLUR_LINEAR_H__
+#define __GIMP_PROP_GUI_MOTION_BLUR_LINEAR_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_motion_blur_linear (GObject                  *config,
+                                       GParamSpec              **param_specs,
+                                       guint                     n_param_specs,
+                                       GeglRectangle            *area,
+                                       GimpContext              *context,
+                                       GimpCreatePickerFunc      create_picker_func,
+                                       GimpCreateControllerFunc  create_controller_func,
+                                       gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_MOTION_BLUR_LINEAR_H__ */
diff --git a/app/propgui/gimppropgui-motion-blur-zoom.c b/app/propgui/gimppropgui-motion-blur-zoom.c
new file mode 100644
index 0000000..e8e359b
--- /dev/null
+++ b/app/propgui/gimppropgui-motion-blur-zoom.c
@@ -0,0 +1,146 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-motion-blur-zoom.c
+ * Copyright (C) 2019  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui-generic.h"
+#include "gimppropgui-motion-blur-zoom.h"
+
+#include "gimp-intl.h"
+
+
+static void
+line_callback (GObject       *config,
+               GeglRectangle *area,
+               gdouble        x1,
+               gdouble        y1,
+               gdouble        x2,
+               gdouble        y2)
+{
+  gdouble x, y;
+  gdouble radius;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  x      = x1 / area->width;
+  y      = y1 / area->height;
+  radius = x2 - x1;
+
+  radius = CLAMP (radius / 100.0, -0.5, 1.0);
+
+  g_object_set (config,
+                "center-x", x,
+                "center-y", y,
+                "factor",   radius,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerLineCallback  set_func;
+  GeglRectangle              *area;
+  gdouble                     x, y;
+  gdouble                     radius;
+  gdouble                     x1, y1, x2, y2;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "center-x", &x,
+                "center-y", &y,
+                "factor",   &radius,
+                NULL);
+
+  x1 = x * area->width;
+  y1 = y * area->height;
+  x2 = x1 + radius * 100.0;
+  y2 = y1;
+
+  set_func (set_data, area, x1, y1, x2, y2);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_motion_blur_zoom (GObject                  *config,
+                                     GParamSpec              **param_specs,
+                                     guint                     n_param_specs,
+                                     GeglRectangle            *area,
+                                     GimpContext              *context,
+                                     GimpCreatePickerFunc      create_picker_func,
+                                     GimpCreateControllerFunc  create_controller_func,
+                                     gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_LINE,
+                                         _("Zoom Motion Blur: "),
+                                         (GCallback) line_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-motion-blur-zoom.h b/app/propgui/gimppropgui-motion-blur-zoom.h
new file mode 100644
index 0000000..ab38304
--- /dev/null
+++ b/app/propgui/gimppropgui-motion-blur-zoom.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-motion-blur-zoom.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_PROP_GUI_MOTION_BLUR_ZOOM_H__
+#define __GIMP_PROP_GUI_MOTION_BLUR_ZOOM_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_motion_blur_zoom (GObject                  *config,
+                                     GParamSpec              **param_specs,
+                                     guint                     n_param_specs,
+                                     GeglRectangle            *area,
+                                     GimpContext              *context,
+                                     GimpCreatePickerFunc      create_picker_func,
+                                     GimpCreateControllerFunc  create_controller_func,
+                                     gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_MOTION_BLUR_ZOOM_H__ */
diff --git a/app/propgui/gimppropgui-newsprint.c b/app/propgui/gimppropgui-newsprint.c
new file mode 100644
index 0000000..214c534
--- /dev/null
+++ b/app/propgui/gimppropgui-newsprint.c
@@ -0,0 +1,444 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-newsprint.c
+ * Copyright (C) 2019  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-newsprint.h"
+
+#include "gimp-intl.h"
+
+
+typedef enum
+{
+  COLOR_MODEL_WHITE_ON_BLACK,
+  COLOR_MODEL_BLACK_ON_WHITE,
+  COLOR_MODEL_RGB,
+  COLOR_MODEL_CMYK,
+
+  N_COLOR_MODELS
+} ColorModel;
+
+typedef enum
+{
+  PATTERN_LINE,
+  PATTERN_CIRCLE,
+  PATTERN_DIAMOND,
+  PATTERN_PSCIRCLE,
+  PATTERN_CROSS,
+
+  N_PATTERNS
+} Pattern;
+
+
+typedef struct _Newsprint Newsprint;
+
+struct _Newsprint
+{
+  GObject   *config;
+  GtkWidget *notebook;
+  GtkWidget *pattern_check;
+  GtkWidget *period_check;
+  GtkWidget *angle_check;
+};
+
+
+/*  local function prototypes  */
+
+static void   newsprint_color_model_notify    (GObject          *config,
+                                               const GParamSpec *pspec,
+                                               GtkWidget        *label);
+static void   newsprint_model_prop_notify     (GObject          *config,
+                                               const GParamSpec *pspec,
+                                               Newsprint        *np);
+static void   newsprint_lock_patterns_toggled (GtkWidget        *widget,
+                                               Newsprint        *np);
+static void   newsprint_lock_periods_toggled  (GtkWidget        *widget,
+                                               Newsprint        *np);
+static void   newsprint_lock_angles_toggled   (GtkWidget        *widget,
+                                               Newsprint        *np);
+
+
+static const gchar *label_strings[N_COLOR_MODELS][4] =
+{
+  { NULL,       NULL,          NULL,         N_("White") },
+  { NULL,       NULL,          NULL,         N_("Black") },
+  { N_("Red"),  N_("Green"),   N_("Blue"),   NULL        },
+  { N_("Cyan"), N_("Magenta"), N_("Yellow"), N_("Black") }
+};
+
+static const gchar *pattern_props[] =
+{
+  "pattern2",
+  "pattern3",
+  "pattern4",
+  "pattern"
+};
+
+static const gchar *period_props[] =
+{
+  "period2",
+  "period3",
+  "period4",
+  "period"
+};
+
+static const gchar *angle_props[] =
+{
+  "angle2",
+  "angle3",
+  "angle4",
+  "angle"
+};
+
+
+/*  public functions  */
+
+GtkWidget *
+_gimp_prop_gui_new_newsprint (GObject                  *config,
+                              GParamSpec              **param_specs,
+                              guint                     n_param_specs,
+                              GeglRectangle            *area,
+                              GimpContext              *context,
+                              GimpCreatePickerFunc      create_picker_func,
+                              GimpCreateControllerFunc  create_controller_func,
+                              gpointer                  creator)
+{
+  Newsprint *np;
+  GtkWidget *main_vbox;
+  GtkWidget *frame;
+  GtkWidget *vbox;
+  GtkWidget *hbox;
+  GtkWidget *combo;
+  GtkWidget *labels[4];
+  GtkWidget *pages[4];
+  GtkWidget *check;
+  gint       i;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  np = g_new0 (Newsprint, 1);
+
+  np->config = config;
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  g_object_set_data_full (G_OBJECT (main_vbox), "newsprint", np,
+                          (GDestroyNotify) g_free);
+
+  frame = gimp_frame_new (_("Channels"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  combo = _gimp_prop_gui_new_generic (config,
+                                      param_specs + 0, 1,
+                                      area,
+                                      context,
+                                      create_picker_func,
+                                      create_controller_func,
+                                      creator);
+  gtk_box_pack_start (GTK_BOX (vbox), combo, FALSE, FALSE, 0);
+  gtk_widget_show (combo);
+
+  np->notebook = gtk_notebook_new ();
+  gtk_box_pack_start (GTK_BOX (vbox), np->notebook, FALSE, FALSE, 0);
+  gtk_widget_show (np->notebook);
+
+  for (i = 0; i < 4; i++)
+    {
+      GtkWidget   *widget;
+      const gchar *unused;
+      gint         remaining;
+
+      labels[i] = gtk_label_new (NULL);
+      pages[i]  = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+
+      g_object_set_data (G_OBJECT (labels[i]), "channel", GINT_TO_POINTER (i));
+
+      g_signal_connect_object (config, "notify::color-model",
+                               G_CALLBACK (newsprint_color_model_notify),
+                               G_OBJECT (labels[i]), 0);
+
+      newsprint_color_model_notify (config, NULL, labels[i]);
+
+      gtk_container_set_border_width (GTK_CONTAINER (pages[i]), 6);
+      gtk_notebook_append_page (GTK_NOTEBOOK (np->notebook),
+                                pages[i], labels[i]);
+
+      widget = gimp_prop_widget_new_from_pspec (config,
+                                                param_specs[1 + 3 * i],
+                                                area, context,
+                                                create_picker_func,
+                                                create_controller_func,
+                                                creator, &unused);
+      gtk_box_pack_start (GTK_BOX (pages[i]), widget, FALSE, FALSE, 0);
+      gtk_widget_show (widget);
+
+      g_object_bind_property (G_OBJECT (widget),   "visible",
+                              G_OBJECT (pages[i]), "visible",
+                              G_BINDING_SYNC_CREATE);
+
+      if (i == 3)
+        remaining = 3;
+      else
+        remaining = 2;
+
+      widget = _gimp_prop_gui_new_generic (config,
+                                           param_specs + 2 + 3 * i, remaining,
+                                           area, context,
+                                           create_picker_func,
+                                           create_controller_func,
+                                           creator);
+      gtk_box_pack_start (GTK_BOX (pages[i]), widget, FALSE, FALSE, 0);
+      gtk_widget_show (widget);
+    }
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  np->pattern_check = check =
+    gtk_check_button_new_with_mnemonic (_("_Lock patterns"));
+  gtk_box_pack_start (GTK_BOX (hbox), check, FALSE, FALSE, 0);
+  gtk_widget_show (check);
+
+  g_signal_connect (check, "toggled",
+                    G_CALLBACK (newsprint_lock_patterns_toggled),
+                    np);
+
+  np->period_check = check =
+    gtk_check_button_new_with_mnemonic (_("Loc_k periods"));
+  gtk_box_pack_start (GTK_BOX (hbox), check, FALSE, FALSE, 0);
+  gtk_widget_show (check);
+
+  g_signal_connect (check, "toggled",
+                    G_CALLBACK (newsprint_lock_periods_toggled),
+                    np);
+
+  np->angle_check = check =
+    gtk_check_button_new_with_mnemonic (_("Lock a_ngles"));
+  gtk_box_pack_start (GTK_BOX (hbox), check, FALSE, FALSE, 0);
+  gtk_widget_show (check);
+
+  g_signal_connect (check, "toggled",
+                    G_CALLBACK (newsprint_lock_angles_toggled),
+                    np);
+
+  frame = gimp_frame_new (_("Quality"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs + 14, 1,
+                                     area,
+                                     context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  frame = gimp_frame_new (_("Effects"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs + 15, 3,
+                                     area,
+                                     context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  g_signal_connect (config, "notify",
+                    G_CALLBACK (newsprint_model_prop_notify),
+                    np);
+
+  return main_vbox;
+}
+
+
+/*  private functions  */
+
+static void
+newsprint_color_model_notify (GObject          *config,
+                              const GParamSpec *pspec,
+                              GtkWidget        *label)
+{
+  ColorModel  model;
+  gint        channel;
+
+  g_object_get (config,
+                "color-model", &model,
+                NULL);
+
+  channel =
+    GPOINTER_TO_INT (g_object_get_data (G_OBJECT (label), "channel"));
+
+  if (label_strings[model][channel])
+    gtk_label_set_text (GTK_LABEL (label),
+                        gettext (label_strings[model][channel]));
+}
+
+static gboolean
+newsprint_sync_model_props (Newsprint         *np,
+                            const GParamSpec  *pspec,
+                            const gchar      **props,
+                            gint               n_props)
+{
+  gint i;
+
+  for (i = 0; i < n_props; i++)
+    {
+      if (! strcmp (pspec->name, props[i]))
+        {
+          GValue value = G_VALUE_INIT;
+          gint   j;
+
+          g_value_init (&value, pspec->value_type);
+
+          g_object_get_property (np->config, pspec->name, &value);
+
+          for (j = 0; j < n_props; j++)
+            {
+              if (i != j)
+                {
+                  g_signal_handlers_block_by_func (np->config,
+                                                   newsprint_model_prop_notify,
+                                                   np);
+
+                  g_object_set_property (np->config, props[j], &value);
+
+                  g_signal_handlers_unblock_by_func (np->config,
+                                                     newsprint_model_prop_notify,
+                                                     np);
+                }
+            }
+
+          g_value_unset (&value);
+
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
+static void
+newsprint_model_prop_notify (GObject          *config,
+                             const GParamSpec *pspec,
+                             Newsprint        *np)
+{
+
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (np->pattern_check)) &&
+      newsprint_sync_model_props (np, pspec,
+                                  pattern_props, G_N_ELEMENTS (pattern_props)))
+    return;
+
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (np->period_check)) &&
+      newsprint_sync_model_props (np, pspec,
+                                  period_props, G_N_ELEMENTS (period_props)))
+    return;
+
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (np->angle_check)) &&
+      newsprint_sync_model_props (np, pspec,
+                                  angle_props, G_N_ELEMENTS (angle_props)))
+    return;
+}
+
+static void
+newsprint_lock_patterns_toggled (GtkWidget *widget,
+                                 Newsprint *np)
+
+{
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
+    {
+      GParamSpec *pspec;
+      gint        channel;
+
+      channel = gtk_notebook_get_current_page (GTK_NOTEBOOK (np->notebook));
+
+      pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (np->config),
+                                            pattern_props[channel]);
+
+      newsprint_sync_model_props (np, pspec,
+                                  pattern_props, G_N_ELEMENTS (pattern_props));
+    }
+}
+
+static void
+newsprint_lock_periods_toggled (GtkWidget *widget,
+                                Newsprint *np)
+
+{
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
+    {
+      GParamSpec *pspec;
+      gint        channel;
+
+      channel = gtk_notebook_get_current_page (GTK_NOTEBOOK (np->notebook));
+
+      pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (np->config),
+                                            period_props[channel]);
+
+      newsprint_sync_model_props (np, pspec,
+                                  period_props, G_N_ELEMENTS (period_props));
+    }
+}
+
+static void
+newsprint_lock_angles_toggled (GtkWidget *widget,
+                               Newsprint *np)
+
+{
+  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)))
+    {
+      GParamSpec *pspec;
+      gint        channel;
+
+      channel = gtk_notebook_get_current_page (GTK_NOTEBOOK (np->notebook));
+
+      pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (np->config),
+                                            angle_props[channel]);
+
+      newsprint_sync_model_props (np, pspec,
+                                  angle_props, G_N_ELEMENTS (angle_props));
+    }
+}
diff --git a/app/propgui/gimppropgui-newsprint.h b/app/propgui/gimppropgui-newsprint.h
new file mode 100644
index 0000000..90df485
--- /dev/null
+++ b/app/propgui/gimppropgui-newsprint.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-newsprint.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_PROP_GUI_NEWSPRINT_H__
+#define __GIMP_PROP_GUI_NEWSPRINT_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_newsprint (GObject                  *config,
+                              GParamSpec              **param_specs,
+                              guint                     n_param_specs,
+                              GeglRectangle            *area,
+                              GimpContext              *context,
+                              GimpCreatePickerFunc      create_picker_func,
+                              GimpCreateControllerFunc  create_controller_func,
+                              gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_NEWSPRINT_H__ */
diff --git a/app/propgui/gimppropgui-panorama-projection.c b/app/propgui/gimppropgui-panorama-projection.c
new file mode 100644
index 0000000..e5aed5b
--- /dev/null
+++ b/app/propgui/gimppropgui-panorama-projection.c
@@ -0,0 +1,144 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-panorama-projection.c
+ * Copyright (C) 2018 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.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-panorama-projection.h"
+
+#include "gimp-intl.h"
+
+
+static void
+gyroscope_callback (GObject       *config,
+                    GeglRectangle *area,
+                    gdouble        yaw,
+                    gdouble        pitch,
+                    gdouble        roll,
+                    gdouble        zoom,
+                    gboolean       invert)
+{
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  g_object_set (config,
+                "pan",     -yaw,
+                "tilt",    -pitch,
+                "spin",    -roll,
+                "zoom",    CLAMP (100.0 * zoom, 0.01, 1000.0),
+                "inverse", invert,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerGyroscopeCallback  set_func;
+  GeglRectangle                   *area;
+  gdouble                          pan;
+  gdouble                          tilt;
+  gdouble                          spin;
+  gdouble                          zoom;
+  gboolean                         inverse;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "pan",     &pan,
+                "tilt",    &tilt,
+                "spin",    &spin,
+                "zoom",    &zoom,
+                "inverse", &inverse,
+                NULL);
+
+  set_func (set_data,
+            area,
+            -pan, -tilt, -spin,
+            zoom / 100.0,
+            inverse);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_panorama_projection (GObject                   *config,
+                                        GParamSpec               **param_specs,
+                                        guint                      n_param_specs,
+                                        GeglRectangle             *area,
+                                        GimpContext               *context,
+                                        GimpCreatePickerFunc       create_picker_func,
+                                        GimpCreateControllerFunc   create_controller_func,
+                                        gpointer                   creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_GYROSCOPE,
+                                         _("Panorama Projection: "),
+                                         (GCallback) gyroscope_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-panorama-projection.h b/app/propgui/gimppropgui-panorama-projection.h
new file mode 100644
index 0000000..11c7b3a
--- /dev/null
+++ b/app/propgui/gimppropgui-panorama-projection.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-panorama-projection.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_PROP_GUI_PANORAMA_PROJECTION_H__
+#define __GIMP_PROP_GUI_PANORAMA_PROJECTION_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_panorama_projection (GObject                   *config,
+                                        GParamSpec               **param_specs,
+                                        guint                      n_param_specs,
+                                        GeglRectangle             *area,
+                                        GimpContext               *context,
+                                        GimpCreatePickerFunc       create_picker_func,
+                                        GimpCreateControllerFunc   create_controller_func,
+                                        gpointer                   creator);
+
+
+#endif /* __GIMP_PROP_GUI_PANORAMA_PROJECTION_H__ */
diff --git a/app/propgui/gimppropgui-recursive-transform.c b/app/propgui/gimppropgui-recursive-transform.c
new file mode 100644
index 0000000..a247723
--- /dev/null
+++ b/app/propgui/gimppropgui-recursive-transform.c
@@ -0,0 +1,334 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-recursive-transform.c
+ * Copyright (C) 2018 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.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-recursive-transform.h"
+
+#include "gimp-intl.h"
+
+
+#define MAX_N_TRANSFORMS 10
+
+
+static void
+add_transform (GtkButton *button,
+               GObject   *config)
+{
+  gchar *transform;
+  gchar *new_transform;
+
+  g_object_get (config,
+                "transform", &transform,
+                NULL);
+
+  new_transform = g_strdup_printf ("%s;matrix (1, 0, 0, 0, 1, 0, 0, 0, 1)",
+                                   transform);
+
+  g_object_set (config,
+                "transform", new_transform,
+                NULL);
+
+  g_free (transform);
+  g_free (new_transform);
+}
+
+static void
+duplicate_transform (GtkButton *button,
+                     GObject   *config)
+{
+  gchar *transform;
+  gchar *new_transform;
+  gchar *delim;
+
+  g_object_get (config,
+                "transform", &transform,
+                NULL);
+
+  delim = strrchr (transform, ';');
+
+  if (! delim)
+    delim = transform;
+  else
+    delim++;
+
+  new_transform = g_strdup_printf ("%s;%s", transform, delim);
+
+  g_object_set (config,
+                "transform", new_transform,
+                NULL);
+
+  g_free (transform);
+  g_free (new_transform);
+}
+
+static void
+remove_transform (GtkButton *button,
+                  GObject   *config)
+{
+  gchar *transform;
+  gchar *delim;
+
+  g_object_get (config,
+                "transform", &transform,
+                NULL);
+
+  delim = strrchr (transform, ';');
+
+  if (delim)
+    {
+      *delim = '\0';
+
+      g_object_set (config,
+                    "transform", transform,
+                    NULL);
+    }
+
+  g_free (transform);
+}
+
+static void
+transform_grids_callback (GObject                    *config,
+                          GeglRectangle              *area,
+                          const GimpMatrix3          *transforms,
+                          gint                        n_transforms)
+{
+  GString *transforms_str = g_string_new (NULL);
+  gchar   *transform_str;
+  gint     i;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  for (i = 0; i < n_transforms; i++)
+    {
+      if (i > 0)
+        g_string_append (transforms_str, ";");
+
+      transform_str = gegl_matrix3_to_string ((GeglMatrix3 *) &transforms[i]);
+
+      g_string_append (transforms_str, transform_str);
+
+      g_free (transform_str);
+    }
+
+  transform_str = g_string_free (transforms_str, FALSE);
+
+  g_object_set (config,
+                "transform", transform_str,
+                NULL);
+
+  g_free (transform_str);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GtkWidget                             *add_button;
+  GtkWidget                             *duplicate_button;
+  GtkWidget                             *remove_button;
+  GimpControllerTransformGridsCallback   set_func;
+  GeglRectangle                         *area;
+  gchar                                 *transform_str;
+  gchar                                **transform_strs;
+  GimpMatrix3                           *transforms;
+  gint                                   n_transforms;
+  gint                                   i;
+
+  add_button       = g_object_get_data (G_OBJECT (config), "add-transform-button");
+  duplicate_button = g_object_get_data (G_OBJECT (config), "duplicate-transform-button");
+  remove_button    = g_object_get_data (G_OBJECT (config), "remove-transform-button");
+  set_func         = g_object_get_data (G_OBJECT (config), "set-func");
+  area             = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "transform", &transform_str,
+                NULL);
+
+  transform_strs = g_strsplit (transform_str, ";", -1);
+
+  g_free (transform_str);
+
+  for (n_transforms = 0; transform_strs[n_transforms]; n_transforms++);
+
+  transforms = g_new (GimpMatrix3, n_transforms);
+
+  for (i = 0; i < n_transforms; i++)
+    {
+      gegl_matrix3_parse_string ((GeglMatrix3 *) &transforms[i],
+                                 transform_strs[i]);
+    }
+
+  set_func (set_data, area, transforms, n_transforms);
+
+  g_strfreev (transform_strs);
+  g_free (transforms);
+
+  gtk_widget_set_sensitive (add_button,       n_transforms < MAX_N_TRANSFORMS);
+  gtk_widget_set_sensitive (duplicate_button, n_transforms < MAX_N_TRANSFORMS);
+  gtk_widget_set_sensitive (remove_button,    n_transforms > 1);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_recursive_transform (GObject                  *config,
+                                        GParamSpec              **param_specs,
+                                        guint                     n_param_specs,
+                                        GeglRectangle            *area,
+                                        GimpContext              *context,
+                                        GimpCreatePickerFunc      create_picker_func,
+                                        GimpCreateControllerFunc  create_controller_func,
+                                        gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  /* skip the "transform" property, which is controlled by a transform-grid
+   * controller.
+   */
+  if (create_controller_func)
+    {
+      param_specs++;
+      n_param_specs--;
+    }
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+  if (create_controller_func)
+    {
+      GtkWidget *outer_vbox;
+      GtkWidget *hbox;
+      GtkWidget *button;
+      GtkWidget *image;
+      GCallback  set_func;
+      gpointer   set_data;
+
+      outer_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL,
+                                gtk_box_get_spacing (GTK_BOX (vbox)));
+
+      gtk_box_pack_start (GTK_BOX (outer_vbox), vbox, FALSE, FALSE, 0);
+      gtk_widget_show (vbox);
+
+      hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+      gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
+      gtk_box_pack_start (GTK_BOX (outer_vbox), hbox, FALSE, FALSE, 2);
+      gtk_widget_show (hbox);
+
+      button = gtk_button_new ();
+      gimp_help_set_help_data (button,
+                               _("Add transform"),
+                               NULL);
+      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+      gtk_widget_show (button);
+
+      image = gtk_image_new_from_icon_name (GIMP_ICON_LIST_ADD,
+                                            GTK_ICON_SIZE_MENU);
+      gtk_container_add (GTK_CONTAINER (button), image);
+      gtk_widget_show (image);
+
+      g_signal_connect (button, "clicked",
+                        G_CALLBACK (add_transform),
+                        config);
+
+      g_object_set_data (config, "add-transform-button", button);
+
+      button = gtk_button_new ();
+      gimp_help_set_help_data (button,
+                               _("Duplicate transform"),
+                               NULL);
+      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+      gtk_widget_show (button);
+
+      image = gtk_image_new_from_icon_name (GIMP_ICON_OBJECT_DUPLICATE,
+                                            GTK_ICON_SIZE_MENU);
+      gtk_container_add (GTK_CONTAINER (button), image);
+      gtk_widget_show (image);
+
+      g_signal_connect (button, "clicked",
+                        G_CALLBACK (duplicate_transform),
+                        config);
+
+      g_object_set_data (config, "duplicate-transform-button", button);
+
+      button = gtk_button_new ();
+      gimp_help_set_help_data (button,
+                               _("Remove transform"),
+                               NULL);
+      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+      gtk_widget_show (button);
+
+      image = gtk_image_new_from_icon_name (GIMP_ICON_LIST_REMOVE,
+                                            GTK_ICON_SIZE_MENU);
+      gtk_container_add (GTK_CONTAINER (button), image);
+      gtk_widget_show (image);
+
+      g_signal_connect (button, "clicked",
+                        G_CALLBACK (remove_transform),
+                        config);
+
+      g_object_set_data (config, "remove-transform-button", button);
+
+      vbox = outer_vbox;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_TRANSFORM_GRIDS,
+                                         _("Recursive Transform: "),
+                                         (GCallback) transform_grids_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-recursive-transform.h b/app/propgui/gimppropgui-recursive-transform.h
new file mode 100644
index 0000000..ac75545
--- /dev/null
+++ b/app/propgui/gimppropgui-recursive-transform.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-recursive-transform.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_PROP_GUI_RECURSIVE_TRANSFORM_H__
+#define __GIMP_PROP_GUI_RECURSIVE_TRANSFORM_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_recursive_transform (GObject                  *config,
+                                        GParamSpec              **param_specs,
+                                        guint                     n_param_specs,
+                                        GeglRectangle            *area,
+                                        GimpContext              *context,
+                                        GimpCreatePickerFunc      create_picker_func,
+                                        GimpCreateControllerFunc  create_controller_func,
+                                        gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_RECURSIVE_TRANSFORM_H__ */
diff --git a/app/propgui/gimppropgui-shadows-highlights.c b/app/propgui/gimppropgui-shadows-highlights.c
new file mode 100644
index 0000000..a5601a0
--- /dev/null
+++ b/app/propgui/gimppropgui-shadows-highlights.c
@@ -0,0 +1,122 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-shadows-highlights.c
+ * Copyright (C) 2002-2014  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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 <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-shadows-highlights.h"
+
+#include "gimp-intl.h"
+
+
+GtkWidget *
+_gimp_prop_gui_new_shadows_highlights (GObject                  *config,
+                                       GParamSpec              **param_specs,
+                                       guint                     n_param_specs,
+                                       GeglRectangle            *area,
+                                       GimpContext              *context,
+                                       GimpCreatePickerFunc      create_picker_func,
+                                       GimpCreateControllerFunc  create_controller_func,
+                                       gpointer                  creator)
+{
+  GtkWidget   *main_vbox;
+  GtkWidget   *frame;
+  GtkWidget   *vbox;
+  GtkWidget   *scale;
+  const gchar *label;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
+
+  frame = gimp_frame_new (_("Shadows"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_widget_new (config, "shadows",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "shadows-ccorrect",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  frame = gimp_frame_new (_("Highlights"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_widget_new (config, "highlights",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "highlights-ccorrect",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  frame = gimp_frame_new (_("Common"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  scale = gimp_prop_widget_new (config, "whitepoint",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "radius",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  scale = gimp_prop_widget_new (config, "compress",
+                                area, context, NULL, NULL, NULL, &label);
+  gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
+  gtk_widget_show (scale);
+
+  return main_vbox;
+}
diff --git a/app/propgui/gimppropgui-shadows-highlights.h b/app/propgui/gimppropgui-shadows-highlights.h
new file mode 100644
index 0000000..fee9b52
--- /dev/null
+++ b/app/propgui/gimppropgui-shadows-highlights.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-shadows-highlights.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_PROP_GUI_SHADOWS_HIGHLIGHTS_H__
+#define __GIMP_PROP_GUI_SHADOWS_HIGHLIGHTS_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_shadows_highlights (GObject                  *config,
+                                       GParamSpec              **param_specs,
+                                       guint                     n_param_specs,
+                                       GeglRectangle            *area,
+                                       GimpContext              *context,
+                                       GimpCreatePickerFunc      create_picker_func,
+                                       GimpCreateControllerFunc  create_controller_func,
+                                       gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_SHADOWS_HIGHLIGHTS_H__ */
diff --git a/app/propgui/gimppropgui-spiral.c b/app/propgui/gimppropgui-spiral.c
new file mode 100644
index 0000000..9aaded2
--- /dev/null
+++ b/app/propgui/gimppropgui-spiral.c
@@ -0,0 +1,239 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-spiral.c
+ * Copyright (C) 2017  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-spiral.h"
+
+#include "gimp-intl.h"
+
+
+typedef enum
+{
+  GEGL_SPIRAL_TYPE_LINEAR,
+  GEGL_SPIRAL_TYPE_LOGARITHMIC
+} GeglSpiralType;
+
+
+static void
+slider_line_callback (GObject                    *config,
+                      GeglRectangle              *area,
+                      gdouble                     x1,
+                      gdouble                     y1,
+                      gdouble                     x2,
+                      gdouble                     y2,
+                      const GimpControllerSlider *sliders,
+                      gint                        n_sliders)
+{
+  GeglSpiralType type;
+  gdouble        x, y;
+  gdouble        radius;
+  gdouble        rotation;
+  gdouble        base;
+  gdouble        balance;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  g_object_get (config,
+                "type",    &type,
+                "base",    &base,
+                "balance", &balance,
+                NULL);
+
+  x        = x1 / area->width;
+  y        = y1 / area->height;
+  radius   = sqrt (SQR (x2 - x1) + SQR (y2 - y1));
+  rotation = atan2 (-(y2 - y1), x2 - x1) * 180 / G_PI;
+
+  if (rotation < 0)
+    rotation += 360.0;
+
+  switch (type)
+    {
+    case GEGL_SPIRAL_TYPE_LINEAR:
+      balance = 3.0 - 4.0 * sliders[0].value;
+
+      break;
+
+    case GEGL_SPIRAL_TYPE_LOGARITHMIC:
+      {
+        gdouble old_base = base;
+
+        base = 1.0 / sliders[1].value;
+        base = MIN (base, 1000000.0);
+
+        /* keep "balance" fixed when changing "base", or when "base" is 1, in
+         * which case there's no inverse mapping for the slider value, and we
+         * can get NaN.
+         */
+        if (base == old_base && base > 1.0)
+          {
+            balance = -4.0 * log (sliders[0].value) / log (base) - 1.0;
+            balance = CLAMP (balance, -1.0, 1.0);
+          }
+      }
+      break;
+    }
+
+  g_object_set (config,
+                "x",        x,
+                "y",        y,
+                "radius",   radius,
+                "base",     base,
+                "rotation", rotation,
+                "balance",  balance,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerSliderLineCallback  set_func;
+  GeglRectangle                    *area;
+  GeglSpiralType                    type;
+  gdouble                           x, y;
+  gdouble                           radius;
+  gdouble                           rotation;
+  gdouble                           base;
+  gdouble                           balance;
+  gdouble                           x1, y1, x2, y2;
+  GimpControllerSlider              sliders[2];
+  gint                              n_sliders = 0;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "type",     &type,
+                "x",        &x,
+                "y",        &y,
+                "radius",   &radius,
+                "rotation", &rotation,
+                "base",     &base,
+                "balance",  &balance,
+                NULL);
+
+  x1 = x * area->width;
+  y1 = y * area->height;
+  x2 = x1 + cos (rotation * (G_PI / 180.0)) * radius;
+  y2 = y1 - sin (rotation * (G_PI / 180.0)) * radius;
+
+  switch (type)
+  {
+  case GEGL_SPIRAL_TYPE_LINEAR:
+    n_sliders = 1;
+
+    /* balance */
+    sliders[0]       = GIMP_CONTROLLER_SLIDER_DEFAULT;
+    sliders[0].min   = 0.5;
+    sliders[0].max   = 1.0;
+    sliders[0].value = 0.5 + (1.0 - balance) / 4.0;
+
+    break;
+
+  case GEGL_SPIRAL_TYPE_LOGARITHMIC:
+    n_sliders = 2;
+
+    /* balance */
+    sliders[0]       = GIMP_CONTROLLER_SLIDER_DEFAULT;
+    sliders[0].min   = 1.0 / sqrt (base);
+    sliders[0].max   = 1.0;
+    sliders[0].value = pow (base, -(balance + 1.0) / 4.0);
+
+    /* base */
+    sliders[1]       = GIMP_CONTROLLER_SLIDER_DEFAULT;
+    sliders[1].min   = 0.0;
+    sliders[1].max   = 1.0;
+    sliders[1].value = 1.0 / base;
+
+    break;
+  }
+
+  set_func (set_data, area, x1, y1, x2, y2, sliders, n_sliders);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_spiral (GObject                  *config,
+                           GParamSpec              **param_specs,
+                           guint                     n_param_specs,
+                           GeglRectangle            *area,
+                           GimpContext              *context,
+                           GimpCreatePickerFunc      create_picker_func,
+                           GimpCreateControllerFunc  create_controller_func,
+                           gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_SLIDER_LINE,
+                                         _("Spiral: "),
+                                         (GCallback) slider_line_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-spiral.h b/app/propgui/gimppropgui-spiral.h
new file mode 100644
index 0000000..1ed47df
--- /dev/null
+++ b/app/propgui/gimppropgui-spiral.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-spiral.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_PROP_GUI_SPIRAL_H__
+#define __GIMP_PROP_GUI_SPIRAL_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_spiral (GObject                  *config,
+                           GParamSpec              **param_specs,
+                           guint                     n_param_specs,
+                           GeglRectangle            *area,
+                           GimpContext              *context,
+                           GimpCreatePickerFunc      create_picker_func,
+                           GimpCreateControllerFunc  create_controller_func,
+                           gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_SPIRAL_H__ */
diff --git a/app/propgui/gimppropgui-supernova.c b/app/propgui/gimppropgui-supernova.c
new file mode 100644
index 0000000..8cc0855
--- /dev/null
+++ b/app/propgui/gimppropgui-supernova.c
@@ -0,0 +1,144 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-supernova.c
+ * Copyright (C) 2017  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui-generic.h"
+#include "gimppropgui-supernova.h"
+
+#include "gimp-intl.h"
+
+
+static void
+line_callback (GObject       *config,
+               GeglRectangle *area,
+               gdouble        x1,
+               gdouble        y1,
+               gdouble        x2,
+               gdouble        y2)
+{
+  gdouble x, y;
+  gint    radius;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  x      = x1 / area->width;
+  y      = y1 / area->height;
+  radius = sqrt (SQR (x2 - x1) + SQR (y2 - y1));
+
+  g_object_set (config,
+                "center-x", x,
+                "center-y", y,
+                "radius",   radius,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerLineCallback  set_func;
+  GeglRectangle              *area;
+  gdouble                     x, y;
+  gint                        radius;
+  gdouble                     x1, y1, x2, y2;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "center-x", &x,
+                "center-y", &y,
+                "radius",   &radius,
+                NULL);
+
+  x1 = x * area->width;
+  y1 = y * area->height;
+  x2 = x1 + radius;
+  y2 = y1;
+
+  set_func (set_data, area, x1, y1, x2, y2);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_supernova (GObject                  *config,
+                              GParamSpec              **param_specs,
+                              guint                     n_param_specs,
+                              GeglRectangle            *area,
+                              GimpContext              *context,
+                              GimpCreatePickerFunc      create_picker_func,
+                              GimpCreateControllerFunc  create_controller_func,
+                              gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_LINE,
+                                         _("Supernova: "),
+                                         (GCallback) line_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-supernova.h b/app/propgui/gimppropgui-supernova.h
new file mode 100644
index 0000000..7cf3a42
--- /dev/null
+++ b/app/propgui/gimppropgui-supernova.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-supernova.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_PROP_GUI_SUPERNOVA_H__
+#define __GIMP_PROP_GUI_SUPERNOVA_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_supernova (GObject                  *config,
+                              GParamSpec              **param_specs,
+                              guint                     n_param_specs,
+                              GeglRectangle            *area,
+                              GimpContext              *context,
+                              GimpCreatePickerFunc      create_picker_func,
+                              GimpCreateControllerFunc  create_controller_func,
+                              gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_SUPERNOVA_H__ */
diff --git a/app/propgui/gimppropgui-utils.c b/app/propgui/gimppropgui-utils.c
new file mode 100644
index 0000000..2721ba5
--- /dev/null
+++ b/app/propgui/gimppropgui-utils.c
@@ -0,0 +1,221 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-utils.c
+ * Copyright (C) 2002-2017  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 <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "widgets/gimpwidgets-utils.h"
+
+#include "gimppropgui-utils.h"
+
+#include "gimp-intl.h"
+
+
+/*  local function prototypes  */
+
+static void      gimp_prop_kelvin_presets_menu_position (GtkMenu        *menu,
+                                                         gint           *x,
+                                                         gint           *y,
+                                                         gboolean       *push_in,
+                                                         gpointer        user_data);
+static gboolean  gimp_prop_kelvin_presets_button_press  (GtkWidget      *widget,
+                                                         GdkEventButton *bevent,
+                                                         GtkMenu        *menu);
+static void      gimp_prop_kelvin_presets_activate      (GtkWidget      *widget,
+                                                         GObject        *config);
+static void      gimp_prop_random_seed_new_clicked      (GtkButton      *button,
+                                                         GtkAdjustment  *adj);
+
+
+/*  public functions  */
+
+GtkWidget *
+gimp_prop_kelvin_presets_new (GObject     *config,
+                              const gchar *property_name)
+{
+  GtkWidget *button;
+  GtkWidget *menu;
+  gint       i;
+
+  const struct
+  {
+    gdouble      kelvin;
+    const gchar *label;
+  }
+  kelvin_presets[] =
+  {
+    { 1700, N_("1,700 K – Match flame") },
+    { 1850, N_("1,850 K – Candle flame, sunset/sunrise") },
+    { 2700, N_("2,700 K - Soft (or warm) LED lamps") },
+    { 3000, N_("3,000 K – Soft (or warm) white compact fluorescent lamps") },
+    { 3200, N_("3,200 K – Studio lamps, photofloods, etc.") },
+    { 3300, N_("3,300 K – Incandescent lamps") },
+    { 3350, N_("3,350 K – Studio \"CP\" light") },
+    { 4000, N_("4,000 K - Cold (daylight) LED lamps") },
+    { 4100, N_("4,100 K – Moonlight") },
+    { 5000, N_("5,000 K – D50") },
+    { 5000, N_("5,000 K – Cool white/daylight compact fluorescent lamps") },
+    { 5000, N_("5,000 K – Horizon daylight") },
+    { 5500, N_("5,500 K – D55") },
+    { 5500, N_("5,500 K – Vertical daylight, electronic flash") },
+    { 6200, N_("6,200 K – Xenon short-arc lamp") },
+    { 6500, N_("6,500 K – D65") },
+    { 6500, N_("6,500 K – Daylight, overcast") },
+    { 7500, N_("7,500 K – D75") },
+    { 9300, N_("9,300 K") }
+  };
+
+  button = gtk_button_new ();
+  gtk_widget_set_can_focus (button, FALSE);
+  gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
+
+  gtk_button_set_image (GTK_BUTTON (button),
+                        gtk_image_new_from_icon_name (GIMP_ICON_MENU_LEFT,
+                                                      GTK_ICON_SIZE_MENU));
+
+  menu = gtk_menu_new ();
+  gtk_menu_attach_to_widget (GTK_MENU (menu), button, NULL);
+
+  gimp_help_set_help_data (button,
+                           _("Choose from a list of common "
+                             "color temperatures"), NULL);
+
+  g_signal_connect (button, "button-press-event",
+                    G_CALLBACK (gimp_prop_kelvin_presets_button_press),
+                    menu);
+
+  for (i = 0; i < G_N_ELEMENTS (kelvin_presets); i++)
+    {
+      GtkWidget *item;
+      gdouble   *kelvin;
+
+      item = gtk_menu_item_new_with_label (gettext (kelvin_presets[i].label));
+      gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+      gtk_widget_show (item);
+
+      g_object_set_data_full (G_OBJECT (item), "property-name",
+                              g_strdup (property_name),
+                              (GDestroyNotify) g_free);
+
+      kelvin = g_new (gdouble, 1);
+      *kelvin = kelvin_presets[i].kelvin;
+
+      g_object_set_data_full (G_OBJECT (item), "kelvin",
+                              kelvin, (GDestroyNotify) g_free);
+
+      g_signal_connect (item, "activate",
+                        G_CALLBACK (gimp_prop_kelvin_presets_activate),
+                        config);
+
+    }
+
+  return button;
+}
+
+GtkWidget *
+gimp_prop_random_seed_new (GObject     *config,
+                           const gchar *property_name)
+{
+  GtkAdjustment *adj;
+  GtkWidget     *hbox;
+  GtkWidget     *spin;
+  GtkWidget     *button;
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+  spin = gimp_prop_spin_button_new (config, property_name,
+                                    1.0, 10.0, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), spin, TRUE, TRUE, 0);
+  gtk_widget_show (spin);
+
+  button = gtk_button_new_with_label (_("New Seed"));
+  gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (spin));
+
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (gimp_prop_random_seed_new_clicked),
+                    adj);
+
+  return hbox;
+}
+
+
+/*  private functions  */
+
+static void
+gimp_prop_kelvin_presets_menu_position (GtkMenu  *menu,
+                                        gint     *x,
+                                        gint     *y,
+                                        gboolean *push_in,
+                                        gpointer  user_data)
+{
+  gimp_button_menu_position (user_data, menu, GTK_POS_LEFT, x, y);
+}
+
+static gboolean
+gimp_prop_kelvin_presets_button_press (GtkWidget      *widget,
+                                       GdkEventButton *bevent,
+                                       GtkMenu        *menu)
+{
+  if (bevent->type == GDK_BUTTON_PRESS)
+    {
+      gtk_menu_popup (menu,
+                      NULL, NULL,
+                      gimp_prop_kelvin_presets_menu_position, widget,
+                      bevent->button, bevent->time);
+    }
+
+  return TRUE;
+}
+
+static void
+gimp_prop_kelvin_presets_activate (GtkWidget *widget,
+                                   GObject   *config)
+{
+  const gchar *property_name;
+  gdouble     *kelvin;
+
+  property_name = g_object_get_data (G_OBJECT (widget), "property-name");
+  kelvin        = g_object_get_data (G_OBJECT (widget), "kelvin");
+
+  if (property_name && kelvin)
+    g_object_set (config, property_name, *kelvin, NULL);
+}
+
+static void
+gimp_prop_random_seed_new_clicked (GtkButton     *button,
+                                   GtkAdjustment *adj)
+{
+  guint32 value;
+
+  value = floor (g_random_double_range (gtk_adjustment_get_lower (adj),
+                                        gtk_adjustment_get_upper (adj) + 1.0));
+
+  gtk_adjustment_set_value (adj, value);
+}
diff --git a/app/propgui/gimppropgui-utils.h b/app/propgui/gimppropgui-utils.h
new file mode 100644
index 0000000..f618ecf
--- /dev/null
+++ b/app/propgui/gimppropgui-utils.h
@@ -0,0 +1,32 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-utils.h
+ * Copyright (C) 2002-2017  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_PROP_GUI_UTILS_H__
+#define __GIMP_PROP_GUI_UTILS_H__
+
+
+GtkWidget * gimp_prop_kelvin_presets_new (GObject     *config,
+                                          const gchar *property_name);
+
+GtkWidget * gimp_prop_random_seed_new    (GObject     *config,
+                                          const gchar *property_name);
+
+
+#endif /* __GIMP_PROP_GUI_UTILS_H__ */
diff --git a/app/propgui/gimppropgui-vignette.c b/app/propgui/gimppropgui-vignette.c
new file mode 100644
index 0000000..5d8ef81
--- /dev/null
+++ b/app/propgui/gimppropgui-vignette.c
@@ -0,0 +1,202 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-vignette.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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "core/gimpcontext.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-vignette.h"
+
+#include "gimp-intl.h"
+
+
+#define MAX_GAMMA 1000.0
+
+
+static void
+focus_callback (GObject       *config,
+                GeglRectangle *area,
+                GimpLimitType  type,
+                gdouble        x,
+                gdouble        y,
+                gdouble        radius,
+                gdouble        aspect_ratio,
+                gdouble        angle,
+                gdouble        inner_limit,
+                gdouble        midpoint)
+{
+  gdouble proportion;
+  gdouble squeeze;
+  gdouble scale;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  g_object_get (config,
+                "proportion", &proportion,
+                NULL);
+
+  if (aspect_ratio >= 0.0)
+    scale = 1.0 - aspect_ratio;
+  else
+    scale = 1.0 / (1.0 + aspect_ratio);
+
+  scale /= 1.0 + proportion * ((gdouble) area->height / area->width - 1.0);
+
+  if (scale <= 1.0)
+    squeeze = +2.0 * atan (1.0 / scale - 1.0) / G_PI;
+  else
+    squeeze = -2.0 * atan (scale - 1.0) / G_PI;
+
+  g_object_set (config,
+                "shape",      type,
+                "x",          x / area->width,
+                "y",          y / area->height,
+                "radius",     2.0 * radius / area->width,
+                "proportion", proportion,
+                "squeeze",    squeeze,
+                "rotation",   fmod (fmod (angle * 180.0 / G_PI, 360.0) + 360.0,
+                                    360.0),
+                "softness",   1.0 - inner_limit,
+                "gamma",      midpoint < 1.0 ?
+                                MIN (log (0.5) / log (midpoint), MAX_GAMMA) :
+                                MAX_GAMMA,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerFocusCallback  set_func;
+  GeglRectangle               *area;
+  GimpLimitType                shape;
+  gdouble                      x, y;
+  gdouble                      radius;
+  gdouble                      proportion;
+  gdouble                      squeeze;
+  gdouble                      rotation;
+  gdouble                      softness;
+  gdouble                      gamma;
+  gdouble                      aspect_ratio;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "shape",      &shape,
+                "x",          &x,
+                "y",          &y,
+                "radius",     &radius,
+                "proportion", &proportion,
+                "squeeze",    &squeeze,
+                "rotation",   &rotation,
+                "softness",   &softness,
+                "gamma",      &gamma,
+                NULL);
+
+  aspect_ratio = 1.0 + ((gdouble) area->height / area->width - 1.0) *
+                       proportion;
+
+  if (squeeze >= 0.0)
+    aspect_ratio /= tan (+squeeze * G_PI / 2.0) + 1.0;
+  else
+    aspect_ratio *= tan (-squeeze * G_PI / 2.0) + 1.0;
+
+  if (aspect_ratio <= 1.0)
+    aspect_ratio = 1.0 - aspect_ratio;
+  else
+    aspect_ratio = 1.0 / aspect_ratio - 1.0;
+
+  set_func (set_data, area,
+            shape,
+            x * area->width,
+            y * area->height,
+            radius * area->width / 2.0,
+            aspect_ratio,
+            rotation / 180.0 * G_PI,
+            1.0 - softness,
+            pow (0.5, 1.0 / gamma));
+}
+
+GtkWidget *
+_gimp_prop_gui_new_vignette (GObject                  *config,
+                             GParamSpec              **param_specs,
+                             guint                     n_param_specs,
+                             GeglRectangle            *area,
+                             GimpContext              *context,
+                             GimpCreatePickerFunc      create_picker_func,
+                             GimpCreateControllerFunc  create_controller_func,
+                             gpointer                  creator)
+{
+  GtkWidget *vbox;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (param_specs != NULL, NULL);
+  g_return_val_if_fail (n_param_specs > 0, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  vbox = _gimp_prop_gui_new_generic (config,
+                                     param_specs, n_param_specs,
+                                     area, context,
+                                     create_picker_func,
+                                     create_controller_func,
+                                     creator);
+
+
+  if (create_controller_func)
+    {
+      GCallback set_func;
+      gpointer  set_data;
+
+      set_func = create_controller_func (creator,
+                                         GIMP_CONTROLLER_TYPE_FOCUS,
+                                         _("Vignette: "),
+                                         (GCallback) focus_callback,
+                                         config,
+                                         &set_data);
+
+      g_object_set_data (G_OBJECT (config), "set-func", set_func);
+
+      g_object_set_data_full (G_OBJECT (config), "area",
+                              g_memdup (area, sizeof (GeglRectangle)),
+                              (GDestroyNotify) g_free);
+
+      config_notify (config, NULL, set_data);
+
+      g_signal_connect (config, "notify",
+                        G_CALLBACK (config_notify),
+                        set_data);
+    }
+
+  return vbox;
+}
diff --git a/app/propgui/gimppropgui-vignette.h b/app/propgui/gimppropgui-vignette.h
new file mode 100644
index 0000000..4db7ea4
--- /dev/null
+++ b/app/propgui/gimppropgui-vignette.h
@@ -0,0 +1,36 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-vignette.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 <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_PROP_GUI_VIGNETTE_H__
+#define __GIMP_PROP_GUI_VIGNETTE_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_vignette (GObject                  *config,
+                             GParamSpec              **param_specs,
+                             guint                     n_param_specs,
+                             GeglRectangle            *area,
+                             GimpContext              *context,
+                             GimpCreatePickerFunc      create_picker_func,
+                             GimpCreateControllerFunc  create_controller_func,
+                             gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_VIGNETTE_H__ */
diff --git a/app/propgui/gimppropgui.c b/app/propgui/gimppropgui.c
new file mode 100644
index 0000000..fcc9a7e
--- /dev/null
+++ b/app/propgui/gimppropgui.c
@@ -0,0 +1,702 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui.c
+ * Copyright (C) 2002-2017  Michael Natterer <mitch@gimp.org>
+ *                          Sven Neumann <sven@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.h>
+#include <gegl-paramspecs.h>
+#include <gtk/gtk.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "propgui-types.h"
+
+#include "gegl/gimp-gegl-utils.h"
+
+#include "operations/gimp-operation-config.h"
+
+#include "core/gimpcontext.h"
+
+#include "widgets/gimpcolorpanel.h"
+#include "widgets/gimpmessagebox.h"
+#include "widgets/gimpspinscale.h"
+#include "widgets/gimppropwidgets.h"
+
+#include "gimppropgui.h"
+#include "gimppropgui-channel-mixer.h"
+#include "gimppropgui-color-balance.h"
+#include "gimppropgui-color-rotate.h"
+#include "gimppropgui-color-to-alpha.h"
+#include "gimppropgui-convolution-matrix.h"
+#include "gimppropgui-diffraction-patterns.h"
+#include "gimppropgui-eval.h"
+#include "gimppropgui-focus-blur.h"
+#include "gimppropgui-generic.h"
+#include "gimppropgui-hue-saturation.h"
+#include "gimppropgui-motion-blur-circular.h"
+#include "gimppropgui-motion-blur-linear.h"
+#include "gimppropgui-motion-blur-zoom.h"
+#include "gimppropgui-newsprint.h"
+#include "gimppropgui-panorama-projection.h"
+#include "gimppropgui-recursive-transform.h"
+#include "gimppropgui-shadows-highlights.h"
+#include "gimppropgui-spiral.h"
+#include "gimppropgui-supernova.h"
+#include "gimppropgui-utils.h"
+#include "gimppropgui-vignette.h"
+
+#include "gimp-intl.h"
+
+
+#define HAS_KEY(p,k,v) gimp_gegl_param_spec_has_key (p, k, v)
+
+
+static gboolean      gimp_prop_string_to_boolean       (GBinding       *binding,
+                                                        const GValue   *from_value,
+                                                        GValue         *to_value,
+                                                        gpointer        user_data);
+static void          gimp_prop_config_notify           (GObject        *config,
+                                                        GParamSpec     *pspec,
+                                                        GtkWidget      *widget);
+static void          gimp_prop_widget_show             (GtkWidget      *widget,
+                                                        GObject        *config);
+static void          gimp_prop_free_label_ref          (GWeakRef       *label_ref);
+
+/*  public functions  */
+
+GtkWidget *
+gimp_prop_widget_new (GObject                  *config,
+                      const gchar              *property_name,
+                      GeglRectangle            *area,
+                      GimpContext              *context,
+                      GimpCreatePickerFunc      create_picker_func,
+                      GimpCreateControllerFunc  create_controller_func,
+                      gpointer                  creator,
+                      const gchar             **label)
+{
+  GParamSpec *pspec;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+
+  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (config),
+                                        property_name);
+
+  return gimp_prop_widget_new_from_pspec (config, pspec, area, context,
+                                          create_picker_func,
+                                          create_controller_func,
+                                          creator,
+                                          label);
+}
+
+GtkWidget *
+gimp_prop_widget_new_from_pspec (GObject                  *config,
+                                 GParamSpec               *pspec,
+                                 GeglRectangle            *area,
+                                 GimpContext              *context,
+                                 GimpCreatePickerFunc      create_picker_func,
+                                 GimpCreateControllerFunc  create_controller_func,
+                                 gpointer                  creator,
+                                 const gchar             **label)
+{
+  GtkWidget *widget = NULL;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (pspec != NULL, NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+  g_return_val_if_fail (label != NULL, NULL);
+
+  *label = NULL;
+
+  if (GEGL_IS_PARAM_SPEC_SEED (pspec))
+    {
+      widget = gimp_prop_random_seed_new (config, pspec->name);
+
+      *label = g_param_spec_get_nick (pspec);
+    }
+  else if (G_IS_PARAM_SPEC_INT (pspec)   ||
+           G_IS_PARAM_SPEC_UINT (pspec)  ||
+           G_IS_PARAM_SPEC_FLOAT (pspec) ||
+           G_IS_PARAM_SPEC_DOUBLE (pspec))
+    {
+      gdouble lower;
+      gdouble upper;
+      gdouble step;
+      gdouble page;
+      gint    digits;
+
+      if (GEGL_IS_PARAM_SPEC_DOUBLE (pspec))
+        {
+          GeglParamSpecDouble *gspec = GEGL_PARAM_SPEC_DOUBLE (pspec);
+
+          lower  = gspec->ui_minimum;
+          upper  = gspec->ui_maximum;
+          step   = gspec->ui_step_small;
+          page   = gspec->ui_step_big;
+          digits = gspec->ui_digits;
+        }
+      else if (GEGL_IS_PARAM_SPEC_INT (pspec))
+        {
+          GeglParamSpecInt *gspec = GEGL_PARAM_SPEC_INT (pspec);
+
+          lower  = gspec->ui_minimum;
+          upper  = gspec->ui_maximum;
+          step   = gspec->ui_step_small;
+          page   = gspec->ui_step_big;
+          digits = 0;
+        }
+      else
+        {
+          gdouble value;
+
+          /* Get the min and max for the given property. */
+          _gimp_prop_widgets_get_numeric_values (config, pspec,
+                                                 &value, &lower, &upper,
+                                                 G_STRFUNC);
+
+          if ((upper - lower <= 1.0) &&
+              (G_IS_PARAM_SPEC_FLOAT (pspec) ||
+               G_IS_PARAM_SPEC_DOUBLE (pspec)))
+            {
+              step   = 0.01;
+              page   = 0.1;
+              digits = 4;
+            }
+          else if ((upper - lower <= 10.0) &&
+                   (G_IS_PARAM_SPEC_FLOAT (pspec) ||
+                    G_IS_PARAM_SPEC_DOUBLE (pspec)))
+            {
+              step   = 0.1;
+              page   = 1.0;
+              digits = 3;
+            }
+          else
+            {
+              step   = 1.0;
+              page   = 10.0;
+              digits = (G_IS_PARAM_SPEC_FLOAT (pspec) ||
+                        G_IS_PARAM_SPEC_DOUBLE (pspec)) ? 2 : 0;
+            }
+        }
+
+      widget = gimp_prop_spin_scale_new (config, pspec->name, NULL,
+                                         step, page, digits);
+
+      if (HAS_KEY (pspec, "unit", "degree") &&
+          (upper - lower) == 360.0)
+        {
+          GtkWidget *hbox;
+          GtkWidget *dial;
+
+          gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (widget), TRUE);
+
+          hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+          gtk_box_pack_start (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
+          gtk_widget_show (widget);
+
+          dial = gimp_prop_angle_dial_new (config, pspec->name);
+          g_object_set (dial,
+                        "clockwise-angles", HAS_KEY (pspec, "direction", "cw"),
+                        NULL);
+          gtk_box_pack_start (GTK_BOX (hbox), dial, FALSE, FALSE, 0);
+          gtk_widget_show (dial);
+
+          gimp_help_set_help_data (hbox, g_param_spec_get_blurb (pspec), NULL);
+          gimp_prop_gui_bind_label (hbox, widget);
+
+          widget = hbox;
+        }
+      else if (HAS_KEY (pspec, "unit", "kelvin"))
+        {
+          GtkWidget *hbox;
+          GtkWidget *button;
+
+          hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+          gtk_box_pack_start (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
+          gtk_widget_show (widget);
+
+          button = gimp_prop_kelvin_presets_new (config, pspec->name);
+          gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+          gtk_widget_show (button);
+
+          gimp_help_set_help_data (hbox, g_param_spec_get_blurb (pspec), NULL);
+          gimp_prop_gui_bind_label (hbox, widget);
+
+          widget = hbox;
+        }
+      else
+        {
+          gimp_prop_gui_bind_label (widget, widget);
+
+          if (area &&
+              (HAS_KEY (pspec, "unit", "pixel-coordinate") ||
+               HAS_KEY (pspec, "unit", "pixel-distance")) &&
+              (HAS_KEY (pspec, "axis", "x") ||
+               HAS_KEY (pspec, "axis", "y")))
+            {
+              gdouble min = lower;
+              gdouble max = upper;
+
+              if (HAS_KEY (pspec, "unit", "pixel-coordinate"))
+                {
+                  /* limit pixel coordinate scales to the actual area */
+
+                  gint off_x = area->x;
+                  gint off_y = area->y;
+
+                  if (HAS_KEY (pspec, "axis", "x"))
+                    {
+                      min = MAX (lower, off_x);
+                      max = MIN (upper, off_x + area->width);
+                    }
+                  else if (HAS_KEY (pspec, "axis","y"))
+                    {
+                      min = MAX (lower, off_y);
+                      max = MIN (upper, off_y + area->height);
+                    }
+                }
+              else if (HAS_KEY (pspec, "unit", "pixel-distance"))
+                {
+                  /* limit pixel distance scales to the same value on the
+                   * x and y axes, so linked values have the same range,
+                   * we use MAX (width, height), see issue #2540
+                   */
+
+                  max = MIN (upper, MAX (area->width, area->height));
+                }
+
+              gimp_spin_scale_set_scale_limits (GIMP_SPIN_SCALE (widget),
+                                                min, max);
+            }
+        }
+    }
+  else if (G_IS_PARAM_SPEC_STRING (pspec))
+    {
+      *label = g_param_spec_get_nick (pspec);
+
+      if (GIMP_IS_PARAM_SPEC_CONFIG_PATH (pspec))
+        {
+          widget =
+            gimp_prop_file_chooser_button_new (config, pspec->name,
+                                               g_param_spec_get_nick (pspec),
+                                               GTK_FILE_CHOOSER_ACTION_OPEN);
+        }
+      else if (HAS_KEY (pspec, "multiline", "true"))
+        {
+          GtkTextBuffer *buffer;
+          GtkWidget     *view;
+
+          buffer = gimp_prop_text_buffer_new (config, pspec->name, -1);
+          view = gtk_text_view_new_with_buffer (buffer);
+          g_object_unref (buffer);
+
+          widget = gtk_scrolled_window_new (NULL, NULL);
+          gtk_widget_set_size_request (widget, -1, 150);
+          gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (widget),
+                                               GTK_SHADOW_IN);
+          gtk_container_add (GTK_CONTAINER (widget), view);
+          gtk_widget_show (view);
+        }
+      else if (HAS_KEY (pspec, "error", "true"))
+        {
+          GtkWidget *l;
+
+          widget = gimp_message_box_new (GIMP_ICON_WILBER_EEK);
+          gimp_message_box_set_primary_text (GIMP_MESSAGE_BOX (widget), "%s",
+                                             *label);
+          gimp_message_box_set_text (GIMP_MESSAGE_BOX (widget), "%s", "");
+
+          l = GIMP_MESSAGE_BOX (widget)->label[1];
+
+          g_object_bind_property (config, pspec->name,
+                                  l,  "label",
+                                  G_BINDING_SYNC_CREATE);
+          g_object_bind_property_full (config, pspec->name,
+                                       widget, "visible",
+                                       G_BINDING_SYNC_CREATE,
+                                       gimp_prop_string_to_boolean,
+                                       NULL,
+                                       NULL, NULL);
+          *label = NULL;
+        }
+      else
+        {
+          widget = gimp_prop_entry_new (config, pspec->name, -1);
+        }
+
+    }
+  else if (G_IS_PARAM_SPEC_BOOLEAN (pspec))
+    {
+      widget = gimp_prop_check_button_new (config, pspec->name,
+                                           g_param_spec_get_nick (pspec));
+
+      gimp_prop_gui_bind_label (widget, widget);
+    }
+  else if (G_IS_PARAM_SPEC_ENUM (pspec))
+    {
+      widget = gimp_prop_enum_combo_box_new (config, pspec->name, 0, 0);
+      gimp_int_combo_box_set_label (GIMP_INT_COMBO_BOX (widget),
+                                    g_param_spec_get_nick (pspec));
+
+      gimp_prop_gui_bind_label (widget, widget);
+    }
+  else if (GIMP_IS_PARAM_SPEC_RGB (pspec))
+    {
+      gboolean   has_alpha;
+      GtkWidget *button;
+
+      has_alpha = gimp_param_spec_rgb_has_alpha (pspec);
+
+      widget = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+      button = gimp_prop_color_button_new (config, pspec->name,
+                                           g_param_spec_get_nick (pspec),
+                                           128, 24,
+                                           has_alpha ?
+                                             GIMP_COLOR_AREA_SMALL_CHECKS :
+                                             GIMP_COLOR_AREA_FLAT);
+      gimp_color_button_set_update (GIMP_COLOR_BUTTON (button), TRUE);
+      gimp_color_panel_set_context (GIMP_COLOR_PANEL (button), context);
+      gtk_box_pack_start (GTK_BOX (widget), button, TRUE, TRUE, 0);
+      gtk_widget_show (button);
+
+      gimp_prop_gui_bind_tooltip (button, widget);
+
+      if (create_picker_func)
+        {
+          button = create_picker_func (creator,
+                                       pspec->name,
+                                       GIMP_ICON_COLOR_PICKER_GRAY,
+                                       _("Pick color from the image"),
+                                       /* pick_abyss = */ FALSE,
+                                       NULL, NULL);
+          gtk_box_pack_start (GTK_BOX (widget), button, FALSE, FALSE, 0);
+          gtk_widget_show (button);
+        }
+
+      *label = g_param_spec_get_nick (pspec);
+    }
+  else
+    {
+      g_warning ("%s: not supported: %s (%s)\n", G_STRFUNC,
+                 g_type_name (G_TYPE_FROM_INSTANCE (pspec)), pspec->name);
+    }
+
+  /* if we have any keys for dynamic properties, listen to config's notify
+   * signal, and update the properties accordingly.
+   */
+  if (gegl_param_spec_get_property_key (pspec, "sensitive") ||
+      gegl_param_spec_get_property_key (pspec, "visible")   ||
+      gegl_param_spec_get_property_key (pspec, "label")     ||
+      gegl_param_spec_get_property_key (pspec, "description"))
+    {
+      g_object_set_data (G_OBJECT (widget), "gimp-prop-pspec", pspec);
+
+      g_signal_connect_object (config, "notify",
+                               G_CALLBACK (gimp_prop_config_notify),
+                               widget, 0);
+
+      if (gegl_param_spec_get_property_key (pspec, "visible"))
+        {
+          /* a bit of a hack: if we have a dynamic "visible" property key,
+           * connect to the widget's "show" signal, so that we can intercept
+           * our caller's gtk_widget_show() call, and keep the widget hidden if
+           * necessary.
+           */
+          g_signal_connect (widget, "show",
+                            G_CALLBACK (gimp_prop_widget_show),
+                            config);
+        }
+
+      /* update all the properties now */
+      gimp_prop_config_notify (config, NULL, widget);
+    }
+
+  return widget;
+}
+
+
+typedef GtkWidget * (* GimpPropGuiNewFunc) (GObject                  *config,
+                                            GParamSpec              **param_specs,
+                                            guint                     n_param_specs,
+                                            GeglRectangle            *area,
+                                            GimpContext              *context,
+                                            GimpCreatePickerFunc      create_picker_func,
+                                            GimpCreateControllerFunc  create_controller_func,
+                                            gpointer                  creator);
+
+static const struct
+{
+  const gchar        *config_type;
+  GimpPropGuiNewFunc  gui_new_func;
+}
+gui_new_funcs[] =
+{
+  { "GimpColorBalanceConfig",
+    _gimp_prop_gui_new_color_balance },
+  { "GimpHueSaturationConfig",
+    _gimp_prop_gui_new_hue_saturation },
+  { "GimpGegl-gegl-color-rotate-config",
+    _gimp_prop_gui_new_color_rotate },
+  { "GimpGegl-gegl-color-to-alpha-config",
+    _gimp_prop_gui_new_color_to_alpha },
+  { "GimpGegl-gegl-convolution-matrix-config",
+    _gimp_prop_gui_new_convolution_matrix },
+  { "GimpGegl-gegl-channel-mixer-config",
+    _gimp_prop_gui_new_channel_mixer },
+  { "GimpGegl-gegl-diffraction-patterns-config",
+    _gimp_prop_gui_new_diffraction_patterns },
+  { "GimpGegl-gegl-focus-blur-config",
+    _gimp_prop_gui_new_focus_blur },
+  { "GimpGegl-gegl-motion-blur-circular-config",
+    _gimp_prop_gui_new_motion_blur_circular },
+  { "GimpGegl-gegl-motion-blur-linear-config",
+    _gimp_prop_gui_new_motion_blur_linear },
+  { "GimpGegl-gegl-motion-blur-zoom-config",
+    _gimp_prop_gui_new_motion_blur_zoom },
+  { "GimpGegl-gegl-newsprint-config",
+    _gimp_prop_gui_new_newsprint },
+  { "GimpGegl-gegl-panorama-projection-config",
+    _gimp_prop_gui_new_panorama_projection },
+  { "GimpGegl-gegl-recursive-transform-config",
+    _gimp_prop_gui_new_recursive_transform },
+  { "GimpGegl-gegl-shadows-highlights-config",
+    _gimp_prop_gui_new_shadows_highlights },
+  { "GimpGegl-gegl-spiral-config",
+    _gimp_prop_gui_new_spiral },
+  { "GimpGegl-gegl-supernova-config",
+    _gimp_prop_gui_new_supernova },
+  { "GimpGegl-gegl-vignette-config",
+    _gimp_prop_gui_new_vignette },
+  { NULL,
+    _gimp_prop_gui_new_generic }
+};
+
+
+GtkWidget *
+gimp_prop_gui_new (GObject                  *config,
+                   GType                     owner_type,
+                   GParamFlags               flags,
+                   GeglRectangle            *area,
+                   GimpContext              *context,
+                   GimpCreatePickerFunc      create_picker_func,
+                   GimpCreateControllerFunc  create_controller_func,
+                   gpointer                  creator)
+{
+  GtkWidget    *gui = NULL;
+  GParamSpec  **param_specs;
+  guint         n_param_specs;
+
+  g_return_val_if_fail (G_IS_OBJECT (config), NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+
+  param_specs = gimp_operation_config_list_properties (config,
+                                                       owner_type, flags,
+                                                       &n_param_specs);
+
+  if (param_specs)
+    {
+      const gchar *config_type_name = G_OBJECT_TYPE_NAME (config);
+      gint         i;
+
+      for (i = 0; i < G_N_ELEMENTS (gui_new_funcs); i++)
+        {
+          if (! gui_new_funcs[i].config_type ||
+              ! strcmp (gui_new_funcs[i].config_type, config_type_name))
+            {
+              g_printerr ("GUI new func match: %s\n",
+                          gui_new_funcs[i].config_type ?
+                          gui_new_funcs[i].config_type : "generic fallback");
+
+              gui = gui_new_funcs[i].gui_new_func (config,
+                                                   param_specs, n_param_specs,
+                                                   area,
+                                                   context,
+                                                   create_picker_func,
+                                                   create_controller_func,
+                                                   creator);
+              break;
+            }
+        }
+
+      g_free (param_specs);
+    }
+  else
+    {
+      gui = gtk_label_new (_("This operation has no editable properties"));
+      gimp_label_set_attributes (GTK_LABEL (gui),
+                                 PANGO_ATTR_STYLE, PANGO_STYLE_ITALIC,
+                                 -1);
+      gtk_misc_set_padding (GTK_MISC (gui), 0, 4);
+    }
+
+  return gui;
+}
+
+void
+gimp_prop_gui_bind_container (GtkWidget *source,
+                              GtkWidget *target)
+{
+  g_object_bind_property (source, "sensitive",
+                          target, "sensitive",
+                          G_BINDING_SYNC_CREATE);
+  g_object_bind_property (source, "visible",
+                          target, "visible",
+                          G_BINDING_SYNC_CREATE);
+}
+
+void
+gimp_prop_gui_bind_label (GtkWidget *source,
+                          GtkWidget *target)
+{
+  GWeakRef    *label_ref;
+  const gchar *label;
+
+  /* we want to update "target"'s "label" property whenever the label
+   * expression associated with "source" is reevaluated, however, "source"
+   * might not itself have a "label" property we can bind to.  just keep around
+   * a reference to "target", and update its label manually.
+   */
+  g_return_if_fail (g_object_get_data (G_OBJECT (source),
+                                       "gimp-prop-label-ref") == NULL);
+
+  label_ref = g_slice_new (GWeakRef);
+
+  g_weak_ref_init (label_ref, target);
+
+  g_object_set_data_full (G_OBJECT (source),
+                          "gimp-prop-label-ref", label_ref,
+                          (GDestroyNotify) gimp_prop_free_label_ref);
+
+  label = g_object_get_data (G_OBJECT (source), "gimp-prop-label");
+
+  if (label)
+    g_object_set (target, "label", label, NULL);
+
+  /* note that "source" might be its own label widget, in which case there's no
+   * need to bind the rest of the properties.
+   */
+  if (source != target)
+    gimp_prop_gui_bind_tooltip (source, target);
+}
+
+void
+gimp_prop_gui_bind_tooltip (GtkWidget *source,
+                            GtkWidget *target)
+{
+  g_object_bind_property (source, "tooltip-text",
+                          target, "tooltip-text",
+                          G_BINDING_SYNC_CREATE);
+}
+
+
+/*  private functions  */
+
+static gboolean
+gimp_prop_string_to_boolean (GBinding     *binding,
+                             const GValue *from_value,
+                             GValue       *to_value,
+                             gpointer      user_data)
+{
+  const gchar *string = g_value_get_string (from_value);
+
+  g_value_set_boolean (to_value, string && *string);
+
+  return TRUE;
+}
+
+static void
+gimp_prop_config_notify (GObject    *config,
+                         GParamSpec *pspec,
+                         GtkWidget  *widget)
+{
+  GParamSpec *widget_pspec;
+  GWeakRef   *label_ref;
+  GtkWidget  *label_widget;
+  gboolean    sensitive;
+  gboolean    visible;
+  gchar      *label;
+  gchar      *description;
+
+  widget_pspec = g_object_get_data (G_OBJECT (widget), "gimp-prop-pspec");
+  label_ref    = g_object_get_data (G_OBJECT (widget), "gimp-prop-label-ref");
+
+  if (label_ref)
+    label_widget = g_weak_ref_get (label_ref);
+  else
+    label_widget = NULL;
+
+  sensitive   = gimp_prop_eval_boolean (config, widget_pspec, "sensitive", TRUE);
+  visible     = gimp_prop_eval_boolean (config, widget_pspec, "visible", TRUE);
+  label       = gimp_prop_eval_string (config, widget_pspec, "label",
+                                       g_param_spec_get_nick (widget_pspec));
+  description = gimp_prop_eval_string (config, widget_pspec, "description",
+                                       g_param_spec_get_blurb (widget_pspec));
+
+  /* we store the label in (and pass ownership over it to) the widget's
+   * "gimp-prop-label" key, so that we can use it to initialize the label
+   * widget's label in gimp_prop_gui_bind_label() upon binding.
+   */
+  g_object_set_data_full (G_OBJECT (widget), "gimp-prop-label", label, g_free);
+
+  g_signal_handlers_block_by_func (widget,
+                                   gimp_prop_widget_show, config);
+
+  gtk_widget_set_sensitive (widget, sensitive);
+  gtk_widget_set_visible (widget, visible);
+  if (label_widget) g_object_set (label_widget, "label", label, NULL);
+  gimp_help_set_help_data (widget, description, NULL);
+
+  g_signal_handlers_unblock_by_func (widget,
+                                     gimp_prop_widget_show, config);
+
+  g_free (description);
+
+  if (label_widget)
+    g_object_unref (label_widget);
+}
+
+static void
+gimp_prop_widget_show (GtkWidget *widget,
+                       GObject   *config)
+{
+  GParamSpec *widget_pspec;
+  gboolean    visible;
+
+  widget_pspec = g_object_get_data (G_OBJECT (widget), "gimp-prop-pspec");
+
+  visible = gimp_prop_eval_boolean (config, widget_pspec, "visible", TRUE);
+
+  gtk_widget_set_visible (widget, visible);
+}
+
+static void
+gimp_prop_free_label_ref (GWeakRef *label_ref)
+{
+  g_weak_ref_clear (label_ref);
+
+  g_slice_free (GWeakRef, label_ref);
+}
diff --git a/app/propgui/gimppropgui.h b/app/propgui/gimppropgui.h
new file mode 100644
index 0000000..d5d6bac
--- /dev/null
+++ b/app/propgui/gimppropgui.h
@@ -0,0 +1,60 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui.h
+ * Copyright (C) 2002-2017 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_PROP_GUI_H__
+#define __GIMP_PROP_GUI_H__
+
+
+/*  A view on all of an object's properties  */
+
+GtkWidget * gimp_prop_widget_new            (GObject                 *config,
+                                             const gchar             *property_name,
+                                             GeglRectangle           *area,
+                                             GimpContext             *context,
+                                             GimpCreatePickerFunc     create_picker,
+                                             GimpCreateControllerFunc create_controller,
+                                             gpointer                 creator,
+                                             const gchar            **label);
+GtkWidget * gimp_prop_widget_new_from_pspec (GObject                 *config,
+                                             GParamSpec              *pspec,
+                                             GeglRectangle           *area,
+                                             GimpContext             *context,
+                                             GimpCreatePickerFunc     create_picker,
+                                             GimpCreateControllerFunc create_controller,
+                                             gpointer                 creator,
+                                             const gchar            **label);
+GtkWidget * gimp_prop_gui_new               (GObject                 *config,
+                                             GType                    owner_type,
+                                             GParamFlags              flags,
+                                             GeglRectangle           *area,
+                                             GimpContext             *context,
+                                             GimpCreatePickerFunc     create_picker,
+                                             GimpCreateControllerFunc create_controller,
+                                             gpointer                 creator);
+
+void        gimp_prop_gui_bind_container    (GtkWidget               *source,
+                                             GtkWidget               *target);
+void        gimp_prop_gui_bind_label        (GtkWidget               *source,
+                                             GtkWidget               *target);
+void        gimp_prop_gui_bind_tooltip      (GtkWidget               *source,
+                                             GtkWidget               *target);
+
+
+#endif /* __GIMP_PROP_GUI_H__ */
diff --git a/app/propgui/propgui-types.h b/app/propgui/propgui-types.h
new file mode 100644
index 0000000..11bbc06
--- /dev/null
+++ b/app/propgui/propgui-types.h
@@ -0,0 +1,145 @@
+/* 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 __PROPGUI_TYPES_H__
+#define __PROPGUI_TYPES_H__
+
+
+#include "display/display-enums.h"
+
+#include "widgets/widgets-types.h"
+
+
+/*  enums, move to propgui-enums.h if we get more  */
+
+typedef enum
+{
+  GIMP_CONTROLLER_TYPE_LINE,
+  GIMP_CONTROLLER_TYPE_SLIDER_LINE,
+  GIMP_CONTROLLER_TYPE_TRANSFORM_GRID,
+  GIMP_CONTROLLER_TYPE_TRANSFORM_GRIDS,
+  GIMP_CONTROLLER_TYPE_GYROSCOPE,
+  GIMP_CONTROLLER_TYPE_FOCUS
+} GimpControllerType;
+
+
+/*  structs  */
+
+typedef struct
+{
+  gdouble        value;           /*  slider value                           */
+  gdouble        min;             /*  minimal allowable slider value         */
+  gdouble        max;             /*  maximal allowable slider value         */
+
+  gboolean       visible    : 1;  /*  slider is visible                      */
+  gboolean       selectable : 1;  /*  slider is selectable                   */
+  gboolean       movable    : 1;  /*  slider movable                         */
+  gboolean       removable  : 1;  /*  slider is removable                    */
+
+  gboolean       autohide   : 1;  /*  whether to autohide the slider         */
+  GimpHandleType type;            /*  slider handle type                     */
+  gdouble        size;            /*  slider handle size, as a fraction of   *
+                                   *  the default size                       */
+
+  gpointer       data;            /*  user data                              */
+} GimpControllerSlider;
+
+#define GIMP_CONTROLLER_SLIDER_DEFAULT                                         \
+  ((const GimpControllerSlider) {                                              \
+    .value      = 0.0,                                                         \
+    .min        = 0.0,                                                         \
+    .max        = 1.0,                                                         \
+                                                                               \
+    .visible    = TRUE,                                                        \
+    .selectable = TRUE,                                                        \
+    .movable    = TRUE,                                                        \
+    .removable  = FALSE,                                                       \
+                                                                               \
+    .autohide   = FALSE,                                                       \
+    .type       = GIMP_HANDLE_FILLED_DIAMOND,                                  \
+    .size       = 1.0,                                                         \
+                                                                               \
+    .data       = NULL                                                         \
+  })
+
+
+/*  function types  */
+
+typedef void (* GimpPickerCallback)                   (gpointer                    data,
+                                                       gpointer                    identifier,
+                                                       gdouble                     x,
+                                                       gdouble                     y,
+                                                       const Babl                 *sample_format,
+                                                       const GimpRGB              *color);
+
+typedef void (* GimpControllerLineCallback)           (gpointer                    data,
+                                                       GeglRectangle              *area,
+                                                       gdouble                     x1,
+                                                       gdouble                     y1,
+                                                       gdouble                     x2,
+                                                       gdouble                     y2);
+typedef void (* GimpControllerSliderLineCallback)     (gpointer                    data,
+                                                       GeglRectangle              *area,
+                                                       gdouble                     x1,
+                                                       gdouble                     y1,
+                                                       gdouble                     x2,
+                                                       gdouble                     y2,
+                                                       const GimpControllerSlider *sliders,
+                                                       gint                        n_sliders);
+typedef void (* GimpControllerTransformGridCallback)  (gpointer                    data,
+                                                       GeglRectangle              *area,
+                                                       const GimpMatrix3          *transform);
+typedef void (* GimpControllerTransformGridsCallback) (gpointer                    data,
+                                                       GeglRectangle              *area,
+                                                       const GimpMatrix3          *transforms,
+                                                       gint                        n_transforms);
+typedef void (* GimpControllerGyroscopeCallback)      (gpointer                    data,
+                                                       GeglRectangle              *area,
+                                                       gdouble                     yaw,
+                                                       gdouble                     pitch,
+                                                       gdouble                     roll,
+                                                       gdouble                     zoom,
+                                                       gboolean                    invert);
+typedef void (* GimpControllerFocusCallback)          (gpointer                    data,
+                                                       GeglRectangle              *area,
+                                                       GimpLimitType               type,
+                                                       gdouble                     x,
+                                                       gdouble                     y,
+                                                       gdouble                     radius,
+                                                       gdouble                     aspect_ratio,
+                                                       gdouble                     angle,
+                                                       gdouble                     inner_limit,
+                                                       gdouble                     midpoint);
+
+
+typedef GtkWidget * (* GimpCreatePickerFunc)          (gpointer                    creator,
+                                                       const gchar                *property_name,
+                                                       const gchar                *icon_name,
+                                                       const gchar                *tooltip,
+                                                       gboolean                    pick_abyss,
+                                                       GimpPickerCallback          callback,
+                                                       gpointer                    callback_data);
+
+typedef GCallback   (* GimpCreateControllerFunc)      (gpointer                    creator,
+                                                       GimpControllerType          controller_type,
+                                                       const gchar                *status_title,
+                                                       GCallback                   callback,
+                                                       gpointer                    callback_data,
+                                                       gpointer                   *set_func_data);
+
+
+#endif /* __PROPGUI_TYPES_H__ */