Adding upstream version 2.10.36.upstream/2.10.36

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

11 files changed, 4114 insertions, 0 deletions

diff --git a/libgimpmath/Makefile.am b/libgimpmath/Makefile.am
new file mode 100644
index 0000000..be67ba8
--- /dev/null
+++ b/libgimpmath/Makefile.am
@@ -0,0 +1,93 @@
+## Process this file with automake to produce Makefile.in
+
+libgimpbase = $(top_builddir)/libgimpbase/libgimpbase-$(GIMP_API_VERSION).la
+
+if PLATFORM_WIN32
+no_undefined = -no-undefined
+endif
+
+if PLATFORM_WIN32
+else
+libm = -lm
+endif
+
+if OS_WIN32
+gimpmath_def = gimpmath.def
+libgimpmath_export_symbols = -export-symbols $(srcdir)/gimpmath.def
+
+install-libtool-import-lib:
+	$(INSTALL) .libs/libgimpmath-$(GIMP_API_VERSION).dll.a $(DESTDIR)$(libdir)
+	$(INSTALL) $(srcdir)/gimpmath.def $(DESTDIR)$(libdir)
+
+uninstall-libtool-import-lib:
+	-rm $(DESTDIR)$(libdir)/libgimpmath-$(GIMP_API_VERSION).dll.a
+	-rm $(DESTDIR)$(libdir)/gimpmath.def
+else
+install-libtool-import-lib:
+uninstall-libtool-import-lib:
+endif
+
+if MS_LIB_AVAILABLE
+noinst_DATA = gimpmath-$(GIMP_API_VERSION).lib
+
+install-ms-lib:
+	$(INSTALL) gimpmath-$(GIMP_API_VERSION).lib $(DESTDIR)$(libdir)
+
+uninstall-ms-lib:
+	-rm $(DESTDIR)$(libdir)/gimpmath-$(GIMP_API_VERSION).lib
+
+gimpmath-@GIMP_API_VERSION@.lib: gimpmath.def
+	lib -name:libgimpmath-$(GIMP_API_VERSION)-@LT_CURRENT_MINUS_AGE@.dll -def:gimpmath.def -out:$@
+
+else
+install-ms-lib:
+uninstall-ms-lib:
+endif
+
+libgimpmathincludedir = $(includedir)/gimp-$(GIMP_API_VERSION)/libgimpmath
+
+AM_CPPFLAGS = \
+	-DG_LOG_DOMAIN=\"LibGimpMath\"	\
+	-DGIMP_MATH_COMPILATION		\
+	-I$(top_srcdir)			\
+	$(GLIB_CFLAGS)			\
+	-I$(includedir)
+
+EXTRA_DIST = \
+	gimpmath.def
+
+lib_LTLIBRARIES = libgimpmath-@GIMP_API_VERSION@.la
+
+libgimpmath_@GIMP_API_VERSION@_la_SOURCES = \
+	gimpmath.h	\
+	gimpmathtypes.h	\
+	gimpmatrix.c	\
+	gimpmatrix.h	\
+	gimpmd5.c	\
+	gimpmd5.h	\
+	gimpvector.c	\
+	gimpvector.h
+
+libgimpmathinclude_HEADERS = \
+	gimpmath.h	\
+	gimpmathtypes.h	\
+	gimpmatrix.h	\
+	gimpmd5.h	\
+	gimpvector.h
+
+libgimpmath_@GIMP_API_VERSION@_la_LDFLAGS = \
+	-version-info $(LT_VERSION_INFO)	\
+	$(no_undefined)				\
+	$(libgimpmath_export_symbols)
+
+EXTRA_libgimpmath_@GIMP_API_VERSION@_la_DEPENDENCIES = $(gimpmath_def)
+
+libgimpmath_@GIMP_API_VERSION@_la_LIBADD = \
+	$(libgimpbase)	\
+	$(GLIB_LIBS)	\
+	$(libm)
+
+
+install-data-local: install-ms-lib install-libtool-import-lib
+
+uninstall-local: uninstall-ms-lib uninstall-libtool-import-lib
diff --git a/libgimpmath/Makefile.in b/libgimpmath/Makefile.in
new file mode 100644
index 0000000..e51bab4
--- /dev/null
+++ b/libgimpmath/Makefile.in
@@ -0,0 +1,1071 @@
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+
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+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+mostlyclean-compile:
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+distclean-compile:
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/gimpmatrix.Plo@am__quote@ # am--include-marker
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+$(am__depfiles_remade):
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+am--depfiles: $(am__depfiles_remade)
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+mostlyclean-libtool:
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+
+clean-libtool:
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+install-libgimpmathincludeHEADERS: $(libgimpmathinclude_HEADERS)
+	@$(NORMAL_INSTALL)
+	@list='$(libgimpmathinclude_HEADERS)'; test -n "$(libgimpmathincludedir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(libgimpmathincludedir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(libgimpmathincludedir)" || exit 1; \
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+	while read files; do \
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+
+uninstall-libgimpmathincludeHEADERS:
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+	dir='$(DESTDIR)$(libgimpmathincludedir)'; $(am__uninstall_files_from_dir)
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+ID: $(am__tagged_files)
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+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
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+	$(am__define_uniq_tagged_files); \
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+CTAGS: ctags
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+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$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)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(DATA) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(libgimpmathincludedir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+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 $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/gimpmatrix.Plo
+	-rm -f ./$(DEPDIR)/gimpmd5.Plo
+	-rm -f ./$(DEPDIR)/gimpvector.Plo
+	-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-data-local install-libgimpmathincludeHEADERS
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-libLTLIBRARIES
+
+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 ./$(DEPDIR)/gimpmatrix.Plo
+	-rm -f ./$(DEPDIR)/gimpmd5.Plo
+	-rm -f ./$(DEPDIR)/gimpvector.Plo
+	-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: uninstall-libLTLIBRARIES \
+	uninstall-libgimpmathincludeHEADERS uninstall-local
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libLTLIBRARIES clean-libtool 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-data-local install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-libLTLIBRARIES \
+	install-libgimpmathincludeHEADERS 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 uninstall-libLTLIBRARIES \
+	uninstall-libgimpmathincludeHEADERS uninstall-local
+
+.PRECIOUS: Makefile
+
+
+@OS_WIN32_TRUE@install-libtool-import-lib:
+@OS_WIN32_TRUE@	$(INSTALL) .libs/libgimpmath-$(GIMP_API_VERSION).dll.a $(DESTDIR)$(libdir)
+@OS_WIN32_TRUE@	$(INSTALL) $(srcdir)/gimpmath.def $(DESTDIR)$(libdir)
+
+@OS_WIN32_TRUE@uninstall-libtool-import-lib:
+@OS_WIN32_TRUE@	-rm $(DESTDIR)$(libdir)/libgimpmath-$(GIMP_API_VERSION).dll.a
+@OS_WIN32_TRUE@	-rm $(DESTDIR)$(libdir)/gimpmath.def
+@OS_WIN32_FALSE@install-libtool-import-lib:
+@OS_WIN32_FALSE@uninstall-libtool-import-lib:
+
+@MS_LIB_AVAILABLE_TRUE@install-ms-lib:
+@MS_LIB_AVAILABLE_TRUE@	$(INSTALL) gimpmath-$(GIMP_API_VERSION).lib $(DESTDIR)$(libdir)
+
+@MS_LIB_AVAILABLE_TRUE@uninstall-ms-lib:
+@MS_LIB_AVAILABLE_TRUE@	-rm $(DESTDIR)$(libdir)/gimpmath-$(GIMP_API_VERSION).lib
+
+@MS_LIB_AVAILABLE_TRUE@gimpmath-@GIMP_API_VERSION@.lib: gimpmath.def
+@MS_LIB_AVAILABLE_TRUE@	lib -name:libgimpmath-$(GIMP_API_VERSION)-@LT_CURRENT_MINUS_AGE@.dll -def:gimpmath.def -out:$@
+
+@MS_LIB_AVAILABLE_FALSE@install-ms-lib:
+@MS_LIB_AVAILABLE_FALSE@uninstall-ms-lib:
+
+install-data-local: install-ms-lib install-libtool-import-lib
+
+uninstall-local: uninstall-ms-lib uninstall-libtool-import-lib
+
+# 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/libgimpmath/gimpmath.def b/libgimpmath/gimpmath.def
new file mode 100644
index 0000000..a32a5ba
--- /dev/null
+++ b/libgimpmath/gimpmath.def
@@ -0,0 +1,78 @@
+EXPORTS
+	gimp_matrix2_determinant
+	gimp_matrix2_get_type
+	gimp_matrix2_identity
+	gimp_matrix2_invert
+	gimp_matrix2_mult
+	gimp_matrix2_transform_point
+	gimp_matrix3_affine
+	gimp_matrix3_determinant
+	gimp_matrix3_equal
+	gimp_matrix3_get_type
+	gimp_matrix3_identity
+	gimp_matrix3_invert
+	gimp_matrix3_is_affine
+	gimp_matrix3_is_diagonal
+	gimp_matrix3_is_identity
+	gimp_matrix3_is_simple
+	gimp_matrix3_mult
+	gimp_matrix3_rotate
+	gimp_matrix3_scale
+	gimp_matrix3_transform_point
+	gimp_matrix3_translate
+	gimp_matrix3_xshear
+	gimp_matrix3_yshear
+	gimp_matrix4_identity
+	gimp_matrix4_mult
+	gimp_matrix4_to_deg
+	gimp_matrix4_transform_point
+	gimp_md5_get_digest
+	gimp_param_matrix2_get_type
+	gimp_param_matrix3_get_type
+	gimp_param_spec_matrix2
+	gimp_param_spec_matrix3
+	gimp_vector2_add
+	gimp_vector2_add_val
+	gimp_vector2_cross_product
+	gimp_vector2_cross_product_val
+	gimp_vector2_inner_product
+	gimp_vector2_inner_product_val
+	gimp_vector2_length
+	gimp_vector2_length_val
+	gimp_vector2_mul
+	gimp_vector2_mul_val
+	gimp_vector2_neg
+	gimp_vector2_neg_val
+	gimp_vector2_new
+	gimp_vector2_normal
+	gimp_vector2_normal_val
+	gimp_vector2_normalize
+	gimp_vector2_normalize_val
+	gimp_vector2_rotate
+	gimp_vector2_rotate_val
+	gimp_vector2_set
+	gimp_vector2_sub
+	gimp_vector2_sub_val
+	gimp_vector3_add
+	gimp_vector3_add_val
+	gimp_vector3_cross_product
+	gimp_vector3_cross_product_val
+	gimp_vector3_inner_product
+	gimp_vector3_inner_product_val
+	gimp_vector3_length
+	gimp_vector3_length_val
+	gimp_vector3_mul
+	gimp_vector3_mul_val
+	gimp_vector3_neg
+	gimp_vector3_neg_val
+	gimp_vector3_new
+	gimp_vector3_normalize
+	gimp_vector3_normalize_val
+	gimp_vector3_rotate
+	gimp_vector3_rotate_val
+	gimp_vector3_set
+	gimp_vector3_sub
+	gimp_vector3_sub_val
+	gimp_vector_2d_to_3d
+	gimp_vector_2d_to_3d_val
+	gimp_vector_3d_to_2d
diff --git a/libgimpmath/gimpmath.h b/libgimpmath/gimpmath.h
new file mode 100644
index 0000000..c20b16f
--- /dev/null
+++ b/libgimpmath/gimpmath.h
@@ -0,0 +1,153 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpmath.h
+ *
+ * This library 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 library 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 library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_MATH_H__
+#define __GIMP_MATH_H__
+
+
+#include <math.h>
+
+#ifdef HAVE_IEEEFP_H
+#include <ieeefp.h>
+#endif
+
+#ifdef G_OS_WIN32
+#include <float.h>
+#endif
+
+#define __GIMP_MATH_H_INSIDE__
+
+#include <libgimpmath/gimpmathtypes.h>
+
+#include <libgimpmath/gimpmatrix.h>
+#include <libgimpmath/gimpmd5.h>
+#include <libgimpmath/gimpvector.h>
+
+#undef __GIMP_MATH_H_INSIDE__
+
+
+G_BEGIN_DECLS
+
+
+/**
+ * SECTION: gimpmath
+ * @title: GimpMath
+ * @short_description: Mathematical definitions and macros.
+ *
+ * Mathematical definitions and macros for use both by the GIMP
+ * application and plug-ins. These macros should be used rather than
+ * the ones from &lt;math.h&gt; for enhanced portability.
+ **/
+
+
+/**
+ * RINT:
+ * @x: the value to be rounded
+ *
+ * This macro rounds its argument @x to an integer value in floating
+ * point format. Use RINT() instead of rint().
+ **/
+#if defined (HAVE_RINT) && 0
+/* note:  rint() depends on the current floating-point rounding mode.  when the
+ * rounding mode is FE_TONEAREST, it, in parctice, breaks ties to even.  this
+ * is different from 'floor (x + 0.5)', which breaks ties up.  in other words
+ * 'rint (2.5) == 2.0', while 'floor (2.5 + 0.5) == 3.0'.  this is asking for
+ * trouble, so let's just use the latter.
+ */
+#define RINT(x) rint(x)
+#else
+#define RINT(x) floor ((x) + 0.5)
+#endif
+
+/**
+ * ROUND:
+ * @x: the value to be rounded.
+ *
+ * This macro rounds its positive argument @x to the nearest integer.
+ **/
+#define ROUND(x) ((int) ((x) + 0.5))
+
+/**
+ * SIGNED_ROUND:
+ * @x: the value to be rounded.
+ *
+ * This macro rounds its argument @x to the nearest integer.
+ **/
+#define SIGNED_ROUND(x) ((int) RINT (x))
+
+/**
+ * SQR:
+ * @x: the value to be squared.
+ *
+ * This macro squares its argument @x.
+ **/
+#define SQR(x) ((x) * (x))
+
+/**
+ * MAX255:
+ * @a: the value to be limited.
+ *
+ * This macro limits it argument @a, an (0-511) int, to 255.
+ **/
+#define MAX255(a)  ((a) | (((a) & 256) - (((a) & 256) >> 8)))
+
+/**
+ * CLAMP0255:
+ * @a: the value to be clamped.
+ *
+ * This macro clamps its argument @a, an int32-range int, between 0
+ * and 255 inclusive.
+ **/
+#define CLAMP0255(a)  CLAMP(a,0,255)
+
+/**
+ * SAFE_CLAMP:
+ * @x:    the value to be limited.
+ * @low:  the lower limit.
+ * @high: the upper limit.
+ *
+ * Ensures that @x is between the limits set by @low and @high,
+ * even if @x is NaN. If @low is greater than @high, or if either
+ * of them is NaN, the result is undefined.
+ *
+ * Since: 2.10
+ **/
+#define SAFE_CLAMP(x, low, high)  ((x) > (low) ? (x) < (high) ? (x) : (high) : (low))
+
+/**
+ * gimp_deg_to_rad:
+ * @angle: the angle to be converted.
+ *
+ * This macro converts its argument @angle from degree to radian.
+ **/
+#define gimp_deg_to_rad(angle) ((angle) * (2.0 * G_PI) / 360.0)
+
+/**
+ * gimp_rad_to_deg:
+ * @angle: the angle to be converted.
+ *
+ * This macro converts its argument @angle from radian to degree.
+ **/
+#define gimp_rad_to_deg(angle) ((angle) * 360.0 / (2.0 * G_PI))
+
+
+G_END_DECLS
+
+#endif /* __GIMP_MATH_H__ */
diff --git a/libgimpmath/gimpmathtypes.h b/libgimpmath/gimpmathtypes.h
new file mode 100644
index 0000000..a6f4628
--- /dev/null
+++ b/libgimpmath/gimpmathtypes.h
@@ -0,0 +1,114 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpmathtypes.h
+ *
+ * This library 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 library 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 library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_MATH_TYPES_H__
+#define __GIMP_MATH_TYPES_H__
+
+
+#include <libgimpbase/gimpbasetypes.h>
+
+
+G_BEGIN_DECLS
+
+typedef struct _GimpMatrix2 GimpMatrix2;
+typedef struct _GimpMatrix3 GimpMatrix3;
+typedef struct _GimpMatrix4 GimpMatrix4;
+
+/**
+ * GimpMatrix2
+ * @coeff: the coefficients
+ *
+ * A two by two matrix.
+ **/
+struct _GimpMatrix2
+{
+  gdouble coeff[2][2];
+};
+
+/**
+ * GimpMatrix3
+ * @coeff: the coefficients
+ *
+ * A three by three matrix.
+ **/
+struct _GimpMatrix3
+{
+  gdouble coeff[3][3];
+};
+
+/**
+ * GimpMatrix4
+ * @coeff: the coefficients
+ *
+ * A four by four matrix.
+ **/
+struct _GimpMatrix4
+{
+  gdouble coeff[4][4];
+};
+
+
+typedef struct _GimpVector2 GimpVector2;
+typedef struct _GimpVector3 GimpVector3;
+typedef struct _GimpVector4 GimpVector4;
+
+/**
+ * GimpVector2:
+ * @x: the x axis
+ * @y: the y axis
+ *
+ * A two dimensional vector.
+ **/
+struct _GimpVector2
+{
+  gdouble x, y;
+};
+
+/**
+ * GimpVector3:
+ * @x: the x axis
+ * @y: the y axis
+ * @z: the z axis
+ *
+ * A three dimensional vector.
+ **/
+struct _GimpVector3
+{
+  gdouble x, y, z;
+};
+
+/**
+ * GimpVector4:
+ * @x: the x axis
+ * @y: the y axis
+ * @z: the z axis
+ * @w: the w axis
+ *
+ * A four dimensional vector.
+ **/
+struct _GimpVector4
+{
+  gdouble x, y, z, w;
+};
+
+
+G_END_DECLS
+
+#endif /* __GIMP_MATH_TYPES_H__ */
diff --git a/libgimpmath/gimpmatrix.c b/libgimpmath/gimpmatrix.c
new file mode 100644
index 0000000..ebee392
--- /dev/null
+++ b/libgimpmath/gimpmatrix.c
@@ -0,0 +1,1080 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpmatrix.c
+ * Copyright (C) 1998 Jay Cox <jaycox@gimp.org>
+ *
+ * This library 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 library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <glib-object.h>
+
+#include "gimpmath.h"
+
+
+/**
+ * SECTION: gimpmatrix
+ * @title: GimpMatrix
+ * @short_description: Utilities to set up and manipulate 3x3
+ *                     transformation matrices.
+ * @see_also: #GimpVector2, #GimpVector3, #GimpVector4
+ *
+ * When doing image manipulation you will often need 3x3
+ * transformation matrices that define translation, rotation, scaling,
+ * shearing and arbitrary perspective transformations using a 3x3
+ * matrix. Here you'll find a set of utility functions to set up those
+ * matrices and to perform basic matrix manipulations and tests.
+ *
+ * Each matrix class has a 2 dimensional gdouble coeff member. The
+ * element for row r and column c of the matrix is coeff[r][c].
+ **/
+
+
+#define EPSILON 1e-6
+
+
+static GimpMatrix2 * matrix2_copy                  (const GimpMatrix2 *matrix);
+
+/**
+ * gimp_matrix2_get_type:
+ *
+ * Reveals the object type
+ *
+ * Returns: the #GType for Matrix2 objects
+ *
+ * Since: 2.4
+ **/
+GType
+gimp_matrix2_get_type (void)
+{
+  static GType matrix_type = 0;
+
+  if (!matrix_type)
+    matrix_type = g_boxed_type_register_static ("GimpMatrix2",
+                                               (GBoxedCopyFunc) matrix2_copy,
+                                               (GBoxedFreeFunc) g_free);
+
+  return matrix_type;
+}
+
+
+/*
+ * GIMP_TYPE_PARAM_MATRIX2
+ */
+
+#define GIMP_PARAM_SPEC_MATRIX2(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), GIMP_TYPE_PARAM_MATRIX2, GimpParamSpecMatrix2))
+
+static void   gimp_param_matrix2_class_init  (GParamSpecClass *class);
+static void   gimp_param_matrix2_init        (GParamSpec      *pspec);
+static void   gimp_param_matrix2_set_default (GParamSpec      *pspec,
+                                              GValue          *value);
+static gint   gimp_param_matrix2_values_cmp  (GParamSpec      *pspec,
+                                              const GValue    *value1,
+                                              const GValue    *value2);
+
+typedef struct _GimpParamSpecMatrix2 GimpParamSpecMatrix2;
+
+struct _GimpParamSpecMatrix2
+{
+  GParamSpecBoxed      parent_instance;
+
+  GimpMatrix2          default_value;
+};
+
+/**
+ * gimp_param_matrix2_get_type:
+ *
+ * Reveals the object type
+ *
+ * Returns: the #GType for a GimpMatrix2 object
+ *
+ * Since: 2.4
+ **/
+GType
+gimp_param_matrix2_get_type (void)
+{
+  static GType spec_type = 0;
+
+  if (!spec_type)
+    {
+      static const GTypeInfo type_info =
+      {
+        sizeof (GParamSpecClass),
+        NULL, NULL,
+        (GClassInitFunc) gimp_param_matrix2_class_init,
+        NULL, NULL,
+        sizeof (GimpParamSpecMatrix2),
+        0,
+        (GInstanceInitFunc) gimp_param_matrix2_init
+      };
+
+      spec_type = g_type_register_static (G_TYPE_PARAM_BOXED,
+                                          "GimpParamMatrix2",
+                                          &type_info, 0);
+    }
+
+  return spec_type;
+}
+
+static void
+gimp_param_matrix2_class_init (GParamSpecClass *class)
+{
+  class->value_type        = GIMP_TYPE_MATRIX2;
+  class->value_set_default = gimp_param_matrix2_set_default;
+  class->values_cmp        = gimp_param_matrix2_values_cmp;
+}
+
+static void
+gimp_param_matrix2_init (GParamSpec *pspec)
+{
+  GimpParamSpecMatrix2 *cspec = GIMP_PARAM_SPEC_MATRIX2 (pspec);
+
+  gimp_matrix2_identity (&cspec->default_value);
+}
+
+static void
+gimp_param_matrix2_set_default (GParamSpec *pspec,
+                                GValue     *value)
+{
+  GimpParamSpecMatrix2 *cspec = GIMP_PARAM_SPEC_MATRIX2 (pspec);
+
+  g_value_set_static_boxed (value, &cspec->default_value);
+}
+
+static gint
+gimp_param_matrix2_values_cmp (GParamSpec   *pspec,
+                               const GValue *value1,
+                               const GValue *value2)
+{
+  GimpMatrix2 *matrix1;
+  GimpMatrix2 *matrix2;
+  gint         i, j;
+
+  matrix1 = value1->data[0].v_pointer;
+  matrix2 = value2->data[0].v_pointer;
+
+  /*  try to return at least *something*, it's useless anyway...  */
+
+  if (! matrix1)
+    return matrix2 != NULL ? -1 : 0;
+  else if (! matrix2)
+    return matrix1 != NULL;
+
+  for (i = 0; i < 2; i++)
+    for (j = 0; j < 2; j++)
+      if (matrix1->coeff[i][j] != matrix2->coeff[i][j])
+        return 1;
+
+  return 0;
+}
+
+/**
+ * gimp_param_spec_matrix2:
+ * @name:          Canonical name of the param
+ * @nick:          Nickname of the param
+ * @blurb:         Brief description of param.
+ * @default_value: Value to use if none is assigned.
+ * @flags:         a combination of #GParamFlags
+ *
+ * Creates a param spec to hold a #GimpMatrix2 value.
+ * See g_param_spec_internal() for more information.
+ *
+ * Returns: a newly allocated #GParamSpec instance
+ *
+ * Since: 2.4
+ **/
+GParamSpec *
+gimp_param_spec_matrix2 (const gchar       *name,
+                         const gchar       *nick,
+                         const gchar       *blurb,
+                         const GimpMatrix2 *default_value,
+                         GParamFlags        flags)
+{
+  GimpParamSpecMatrix2 *cspec;
+
+  g_return_val_if_fail (default_value != NULL, NULL);
+
+  cspec = g_param_spec_internal (GIMP_TYPE_PARAM_MATRIX2,
+                                 name, nick, blurb, flags);
+
+  cspec->default_value = *default_value;
+
+  return G_PARAM_SPEC (cspec);
+}
+
+
+static GimpMatrix2 *
+matrix2_copy (const GimpMatrix2 *matrix)
+{
+  return (GimpMatrix2 *) g_memdup (matrix, sizeof (GimpMatrix2));
+}
+
+
+/**
+ * gimp_matrix2_identity:
+ * @matrix: A matrix.
+ *
+ * Sets the matrix to the identity matrix.
+ */
+void
+gimp_matrix2_identity (GimpMatrix2 *matrix)
+{
+  static const GimpMatrix2 identity = { { { 1.0, 0.0 },
+                                          { 0.0, 1.0 } } };
+
+  *matrix = identity;
+}
+
+/**
+ * gimp_matrix2_mult:
+ * @matrix1: The first input matrix.
+ * @matrix2: The second input matrix which will be overwritten by the result.
+ *
+ * Multiplies two matrices and puts the result into the second one.
+ */
+void
+gimp_matrix2_mult (const GimpMatrix2 *matrix1,
+                   GimpMatrix2       *matrix2)
+{
+  GimpMatrix2  tmp;
+
+  tmp.coeff[0][0] = (matrix1->coeff[0][0] * matrix2->coeff[0][0] +
+                     matrix1->coeff[0][1] * matrix2->coeff[1][0]);
+  tmp.coeff[0][1] = (matrix1->coeff[0][0] * matrix2->coeff[0][1] +
+                     matrix1->coeff[0][1] * matrix2->coeff[1][1]);
+  tmp.coeff[1][0] = (matrix1->coeff[1][0] * matrix2->coeff[0][0] +
+                     matrix1->coeff[1][1] * matrix2->coeff[1][0]);
+  tmp.coeff[1][1] = (matrix1->coeff[1][0] * matrix2->coeff[0][1] +
+                     matrix1->coeff[1][1] * matrix2->coeff[1][1]);
+
+  *matrix2 = tmp;
+}
+
+/**
+ * gimp_matrix2_determinant:
+ * @matrix: The input matrix.
+ *
+ * Calculates the determinant of the given matrix.
+ *
+ * Returns: The determinant.
+ *
+ * Since: 2.10.16
+ */
+
+gdouble
+gimp_matrix2_determinant (const GimpMatrix2 *matrix)
+{
+  return matrix->coeff[0][0] * matrix->coeff[1][1] -
+         matrix->coeff[0][1] * matrix->coeff[1][0];
+}
+
+/**
+ * gimp_matrix2_invert:
+ * @matrix: The matrix that is to be inverted.
+ *
+ * Inverts the given matrix.
+ *
+ * Since: 2.10.16
+ */
+void
+gimp_matrix2_invert (GimpMatrix2 *matrix)
+{
+  gdouble det = gimp_matrix2_determinant (matrix);
+  gdouble temp;
+
+  if (fabs (det) <= EPSILON)
+    return;
+
+  temp = matrix->coeff[0][0];
+
+  matrix->coeff[0][0]  = matrix->coeff[1][1] / det;
+  matrix->coeff[0][1] /= -det;
+  matrix->coeff[1][0] /= -det;
+  matrix->coeff[1][1]  = temp / det;
+}
+
+/**
+ * gimp_matrix2_transform_point:
+ * @matrix: The transformation matrix.
+ * @x: The source X coordinate.
+ * @y: The source Y coordinate.
+ * @newx: The transformed X coordinate.
+ * @newy: The transformed Y coordinate.
+ *
+ * Transforms a point in 2D as specified by the transformation matrix.
+ *
+ * Since: 2.10.16
+ */
+void
+gimp_matrix2_transform_point (const GimpMatrix2 *matrix,
+                              gdouble            x,
+                              gdouble            y,
+                              gdouble           *newx,
+                              gdouble           *newy)
+{
+  *newx = matrix->coeff[0][0] * x + matrix->coeff[0][1] * y;
+  *newy = matrix->coeff[1][0] * x + matrix->coeff[1][1] * y;
+}
+
+
+static GimpMatrix3 * matrix3_copy                  (const GimpMatrix3 *matrix);
+
+/**
+ * gimp_matrix3_get_type:
+ *
+ * Reveals the object type
+ *
+ * Returns: the #GType for Matrix3 objects
+ *
+ * Since: 2.8
+ **/
+GType
+gimp_matrix3_get_type (void)
+{
+  static GType matrix_type = 0;
+
+  if (!matrix_type)
+    matrix_type = g_boxed_type_register_static ("GimpMatrix3",
+                                               (GBoxedCopyFunc) matrix3_copy,
+                                               (GBoxedFreeFunc) g_free);
+
+  return matrix_type;
+}
+
+
+/*
+ * GIMP_TYPE_PARAM_MATRIX3
+ */
+
+#define GIMP_PARAM_SPEC_MATRIX3(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), GIMP_TYPE_PARAM_MATRIX3, GimpParamSpecMatrix3))
+
+static void   gimp_param_matrix3_class_init  (GParamSpecClass *class);
+static void   gimp_param_matrix3_init        (GParamSpec      *pspec);
+static void   gimp_param_matrix3_set_default (GParamSpec      *pspec,
+                                              GValue          *value);
+static gint   gimp_param_matrix3_values_cmp  (GParamSpec      *pspec,
+                                              const GValue    *value1,
+                                              const GValue    *value2);
+
+typedef struct _GimpParamSpecMatrix3 GimpParamSpecMatrix3;
+
+struct _GimpParamSpecMatrix3
+{
+  GParamSpecBoxed      parent_instance;
+
+  GimpMatrix3          default_value;
+};
+
+/**
+ * gimp_param_matrix3_get_type:
+ *
+ * Reveals the object type
+ *
+ * Returns: the #GType for a GimpMatrix3 object
+ *
+ * Since: 2.8
+ **/
+GType
+gimp_param_matrix3_get_type (void)
+{
+  static GType spec_type = 0;
+
+  if (!spec_type)
+    {
+      static const GTypeInfo type_info =
+      {
+        sizeof (GParamSpecClass),
+        NULL, NULL,
+        (GClassInitFunc) gimp_param_matrix3_class_init,
+        NULL, NULL,
+        sizeof (GimpParamSpecMatrix3),
+        0,
+        (GInstanceInitFunc) gimp_param_matrix3_init
+      };
+
+      spec_type = g_type_register_static (G_TYPE_PARAM_BOXED,
+                                          "GimpParamMatrix3",
+                                          &type_info, 0);
+    }
+
+  return spec_type;
+}
+
+static void
+gimp_param_matrix3_class_init (GParamSpecClass *class)
+{
+  class->value_type        = GIMP_TYPE_MATRIX3;
+  class->value_set_default = gimp_param_matrix3_set_default;
+  class->values_cmp        = gimp_param_matrix3_values_cmp;
+}
+
+static void
+gimp_param_matrix3_init (GParamSpec *pspec)
+{
+  GimpParamSpecMatrix3 *cspec = GIMP_PARAM_SPEC_MATRIX3 (pspec);
+
+  gimp_matrix3_identity (&cspec->default_value);
+}
+
+static void
+gimp_param_matrix3_set_default (GParamSpec *pspec,
+                                GValue     *value)
+{
+  GimpParamSpecMatrix3 *cspec = GIMP_PARAM_SPEC_MATRIX3 (pspec);
+
+  g_value_set_static_boxed (value, &cspec->default_value);
+}
+
+static gint
+gimp_param_matrix3_values_cmp (GParamSpec   *pspec,
+                               const GValue *value1,
+                               const GValue *value2)
+{
+  GimpMatrix3 *matrix1;
+  GimpMatrix3 *matrix2;
+  gint         i, j;
+
+  matrix1 = value1->data[0].v_pointer;
+  matrix2 = value2->data[0].v_pointer;
+
+  /*  try to return at least *something*, it's useless anyway...  */
+
+  if (! matrix1)
+    return matrix2 != NULL ? -1 : 0;
+  else if (! matrix2)
+    return matrix1 != NULL;
+
+  for (i = 0; i < 3; i++)
+    for (j = 0; j < 3; j++)
+      if (matrix1->coeff[i][j] != matrix2->coeff[i][j])
+        return 1;
+
+  return 0;
+}
+
+/**
+ * gimp_param_spec_matrix3:
+ * @name:          Canonical name of the param
+ * @nick:          Nickname of the param
+ * @blurb:         Brief description of param.
+ * @default_value: Value to use if none is assigned.
+ * @flags:         a combination of #GParamFlags
+ *
+ * Creates a param spec to hold a #GimpMatrix3 value.
+ * See g_param_spec_internal() for more information.
+ *
+ * Returns: a newly allocated #GParamSpec instance
+ *
+ * Since: 2.8
+ **/
+GParamSpec *
+gimp_param_spec_matrix3 (const gchar       *name,
+                         const gchar       *nick,
+                         const gchar       *blurb,
+                         const GimpMatrix3 *default_value,
+                         GParamFlags        flags)
+{
+  GimpParamSpecMatrix3 *cspec;
+
+  cspec = g_param_spec_internal (GIMP_TYPE_PARAM_MATRIX3,
+                                 name, nick, blurb, flags);
+
+  if (default_value)
+    cspec->default_value = *default_value;
+
+  return G_PARAM_SPEC (cspec);
+}
+
+
+static GimpMatrix3 *
+matrix3_copy (const GimpMatrix3 *matrix)
+{
+  return (GimpMatrix3 *) g_memdup (matrix, sizeof (GimpMatrix3));
+}
+
+
+/**
+ * gimp_matrix3_identity:
+ * @matrix: A matrix.
+ *
+ * Sets the matrix to the identity matrix.
+ */
+void
+gimp_matrix3_identity (GimpMatrix3 *matrix)
+{
+  static const GimpMatrix3 identity = { { { 1.0, 0.0, 0.0 },
+                                          { 0.0, 1.0, 0.0 },
+                                          { 0.0, 0.0, 1.0 } } };
+
+  *matrix = identity;
+}
+
+/**
+ * gimp_matrix3_transform_point:
+ * @matrix: The transformation matrix.
+ * @x: The source X coordinate.
+ * @y: The source Y coordinate.
+ * @newx: The transformed X coordinate.
+ * @newy: The transformed Y coordinate.
+ *
+ * Transforms a point in 2D as specified by the transformation matrix.
+ */
+void
+gimp_matrix3_transform_point (const GimpMatrix3 *matrix,
+                              gdouble            x,
+                              gdouble            y,
+                              gdouble           *newx,
+                              gdouble           *newy)
+{
+  gdouble  w;
+
+  w = matrix->coeff[2][0] * x + matrix->coeff[2][1] * y + matrix->coeff[2][2];
+
+  if (w == 0.0)
+    w = 1.0;
+  else
+    w = 1.0/w;
+
+  *newx = (matrix->coeff[0][0] * x +
+           matrix->coeff[0][1] * y +
+           matrix->coeff[0][2]) * w;
+  *newy = (matrix->coeff[1][0] * x +
+           matrix->coeff[1][1] * y +
+           matrix->coeff[1][2]) * w;
+}
+
+/**
+ * gimp_matrix3_mult:
+ * @matrix1: The first input matrix.
+ * @matrix2: The second input matrix which will be overwritten by the result.
+ *
+ * Multiplies two matrices and puts the result into the second one.
+ */
+void
+gimp_matrix3_mult (const GimpMatrix3 *matrix1,
+                   GimpMatrix3       *matrix2)
+{
+  gint         i, j;
+  GimpMatrix3  tmp;
+  gdouble      t1, t2, t3;
+
+  for (i = 0; i < 3; i++)
+    {
+      t1 = matrix1->coeff[i][0];
+      t2 = matrix1->coeff[i][1];
+      t3 = matrix1->coeff[i][2];
+
+      for (j = 0; j < 3; j++)
+        {
+          tmp.coeff[i][j]  = t1 * matrix2->coeff[0][j];
+          tmp.coeff[i][j] += t2 * matrix2->coeff[1][j];
+          tmp.coeff[i][j] += t3 * matrix2->coeff[2][j];
+        }
+    }
+
+  *matrix2 = tmp;
+}
+
+/**
+ * gimp_matrix3_translate:
+ * @matrix: The matrix that is to be translated.
+ * @x: Translation in X direction.
+ * @y: Translation in Y direction.
+ *
+ * Translates the matrix by x and y.
+ */
+void
+gimp_matrix3_translate (GimpMatrix3 *matrix,
+                        gdouble      x,
+                        gdouble      y)
+{
+  gdouble g, h, i;
+
+  g = matrix->coeff[2][0];
+  h = matrix->coeff[2][1];
+  i = matrix->coeff[2][2];
+
+  matrix->coeff[0][0] += x * g;
+  matrix->coeff[0][1] += x * h;
+  matrix->coeff[0][2] += x * i;
+  matrix->coeff[1][0] += y * g;
+  matrix->coeff[1][1] += y * h;
+  matrix->coeff[1][2] += y * i;
+}
+
+/**
+ * gimp_matrix3_scale:
+ * @matrix: The matrix that is to be scaled.
+ * @x: X scale factor.
+ * @y: Y scale factor.
+ *
+ * Scales the matrix by x and y
+ */
+void
+gimp_matrix3_scale (GimpMatrix3 *matrix,
+                    gdouble      x,
+                    gdouble      y)
+{
+  matrix->coeff[0][0] *= x;
+  matrix->coeff[0][1] *= x;
+  matrix->coeff[0][2] *= x;
+
+  matrix->coeff[1][0] *= y;
+  matrix->coeff[1][1] *= y;
+  matrix->coeff[1][2] *= y;
+}
+
+/**
+ * gimp_matrix3_rotate:
+ * @matrix: The matrix that is to be rotated.
+ * @theta: The angle of rotation (in radians).
+ *
+ * Rotates the matrix by theta degrees.
+ */
+void
+gimp_matrix3_rotate (GimpMatrix3 *matrix,
+                     gdouble      theta)
+{
+  gdouble t1, t2;
+  gdouble cost, sint;
+
+  cost = cos (theta);
+  sint = sin (theta);
+
+  t1 = matrix->coeff[0][0];
+  t2 = matrix->coeff[1][0];
+  matrix->coeff[0][0] = cost * t1 - sint * t2;
+  matrix->coeff[1][0] = sint * t1 + cost * t2;
+
+  t1 = matrix->coeff[0][1];
+  t2 = matrix->coeff[1][1];
+  matrix->coeff[0][1] = cost * t1 - sint * t2;
+  matrix->coeff[1][1] = sint * t1 + cost * t2;
+
+  t1 = matrix->coeff[0][2];
+  t2 = matrix->coeff[1][2];
+  matrix->coeff[0][2] = cost * t1 - sint * t2;
+  matrix->coeff[1][2] = sint * t1 + cost * t2;
+}
+
+/**
+ * gimp_matrix3_xshear:
+ * @matrix: The matrix that is to be sheared.
+ * @amount: X shear amount.
+ *
+ * Shears the matrix in the X direction.
+ */
+void
+gimp_matrix3_xshear (GimpMatrix3 *matrix,
+                     gdouble      amount)
+{
+  matrix->coeff[0][0] += amount * matrix->coeff[1][0];
+  matrix->coeff[0][1] += amount * matrix->coeff[1][1];
+  matrix->coeff[0][2] += amount * matrix->coeff[1][2];
+}
+
+/**
+ * gimp_matrix3_yshear:
+ * @matrix: The matrix that is to be sheared.
+ * @amount: Y shear amount.
+ *
+ * Shears the matrix in the Y direction.
+ */
+void
+gimp_matrix3_yshear (GimpMatrix3 *matrix,
+                     gdouble      amount)
+{
+  matrix->coeff[1][0] += amount * matrix->coeff[0][0];
+  matrix->coeff[1][1] += amount * matrix->coeff[0][1];
+  matrix->coeff[1][2] += amount * matrix->coeff[0][2];
+}
+
+/**
+ * gimp_matrix3_affine:
+ * @matrix: The input matrix.
+ * @a: the 'a' coefficient
+ * @b: the 'b' coefficient
+ * @c: the 'c' coefficient
+ * @d: the 'd' coefficient
+ * @e: the 'e' coefficient
+ * @f: the 'f' coefficient
+ *
+ * Applies the affine transformation given by six values to @matrix.
+ * The six values form define an affine transformation matrix as
+ * illustrated below:
+ *
+ *  ( a c e )
+ *  ( b d f )
+ *  ( 0 0 1 )
+ **/
+void
+gimp_matrix3_affine (GimpMatrix3 *matrix,
+                     gdouble      a,
+                     gdouble      b,
+                     gdouble      c,
+                     gdouble      d,
+                     gdouble      e,
+                     gdouble      f)
+{
+  GimpMatrix3 affine;
+
+  affine.coeff[0][0] = a;
+  affine.coeff[1][0] = b;
+  affine.coeff[2][0] = 0.0;
+
+  affine.coeff[0][1] = c;
+  affine.coeff[1][1] = d;
+  affine.coeff[2][1] = 0.0;
+
+  affine.coeff[0][2] = e;
+  affine.coeff[1][2] = f;
+  affine.coeff[2][2] = 1.0;
+
+  gimp_matrix3_mult (&affine, matrix);
+}
+
+/**
+ * gimp_matrix3_determinant:
+ * @matrix: The input matrix.
+ *
+ * Calculates the determinant of the given matrix.
+ *
+ * Returns: The determinant.
+ */
+gdouble
+gimp_matrix3_determinant (const GimpMatrix3 *matrix)
+{
+  gdouble determinant;
+
+  determinant  = (matrix->coeff[0][0] *
+                  (matrix->coeff[1][1] * matrix->coeff[2][2] -
+                   matrix->coeff[1][2] * matrix->coeff[2][1]));
+  determinant -= (matrix->coeff[1][0] *
+                  (matrix->coeff[0][1] * matrix->coeff[2][2] -
+                   matrix->coeff[0][2] * matrix->coeff[2][1]));
+  determinant += (matrix->coeff[2][0] *
+                  (matrix->coeff[0][1] * matrix->coeff[1][2] -
+                   matrix->coeff[0][2] * matrix->coeff[1][1]));
+
+  return determinant;
+}
+
+/**
+ * gimp_matrix3_invert:
+ * @matrix: The matrix that is to be inverted.
+ *
+ * Inverts the given matrix.
+ */
+void
+gimp_matrix3_invert (GimpMatrix3 *matrix)
+{
+  GimpMatrix3 inv;
+  gdouble     det;
+
+  det = gimp_matrix3_determinant (matrix);
+
+  if (det == 0.0)
+    return;
+
+  det = 1.0 / det;
+
+  inv.coeff[0][0] =   (matrix->coeff[1][1] * matrix->coeff[2][2] -
+                       matrix->coeff[1][2] * matrix->coeff[2][1]) * det;
+
+  inv.coeff[1][0] = - (matrix->coeff[1][0] * matrix->coeff[2][2] -
+                       matrix->coeff[1][2] * matrix->coeff[2][0]) * det;
+
+  inv.coeff[2][0] =   (matrix->coeff[1][0] * matrix->coeff[2][1] -
+                       matrix->coeff[1][1] * matrix->coeff[2][0]) * det;
+
+  inv.coeff[0][1] = - (matrix->coeff[0][1] * matrix->coeff[2][2] -
+                       matrix->coeff[0][2] * matrix->coeff[2][1]) * det;
+
+  inv.coeff[1][1] =   (matrix->coeff[0][0] * matrix->coeff[2][2] -
+                       matrix->coeff[0][2] * matrix->coeff[2][0]) * det;
+
+  inv.coeff[2][1] = - (matrix->coeff[0][0] * matrix->coeff[2][1] -
+                       matrix->coeff[0][1] * matrix->coeff[2][0]) * det;
+
+  inv.coeff[0][2] =   (matrix->coeff[0][1] * matrix->coeff[1][2] -
+                       matrix->coeff[0][2] * matrix->coeff[1][1]) * det;
+
+  inv.coeff[1][2] = - (matrix->coeff[0][0] * matrix->coeff[1][2] -
+                       matrix->coeff[0][2] * matrix->coeff[1][0]) * det;
+
+  inv.coeff[2][2] =   (matrix->coeff[0][0] * matrix->coeff[1][1] -
+                       matrix->coeff[0][1] * matrix->coeff[1][0]) * det;
+
+  *matrix = inv;
+}
+
+
+/*  functions to test for matrix properties  */
+
+/**
+ * gimp_matrix3_is_identity:
+ * @matrix: The matrix that is to be tested.
+ *
+ * Checks if the given matrix is the identity matrix.
+ *
+ * Returns: %TRUE if the matrix is the identity matrix, %FALSE otherwise
+ */
+gboolean
+gimp_matrix3_is_identity (const GimpMatrix3 *matrix)
+{
+  gint i, j;
+
+  for (i = 0; i < 3; i++)
+    {
+      for (j = 0; j < 3; j++)
+        {
+          if (i == j)
+            {
+              if (fabs (matrix->coeff[i][j] - 1.0) > EPSILON)
+                return FALSE;
+            }
+          else
+            {
+              if (fabs (matrix->coeff[i][j]) > EPSILON)
+                return FALSE;
+            }
+        }
+    }
+
+  return TRUE;
+}
+
+/**
+ * gimp_matrix3_is_diagonal:
+ * @matrix: The matrix that is to be tested.
+ *
+ * Checks if the given matrix is diagonal.
+ *
+ * Returns: %TRUE if the matrix is diagonal, %FALSE otherwise
+ */
+gboolean
+gimp_matrix3_is_diagonal (const GimpMatrix3 *matrix)
+{
+  gint i, j;
+
+  for (i = 0; i < 3; i++)
+    {
+      for (j = 0; j < 3; j++)
+        {
+          if (i != j && fabs (matrix->coeff[i][j]) > EPSILON)
+            return FALSE;
+        }
+    }
+
+  return TRUE;
+}
+
+/**
+ * gimp_matrix3_is_affine:
+ * @matrix: The matrix that is to be tested.
+ *
+ * Checks if the given matrix defines an affine transformation.
+ *
+ * Returns: %TRUE if the matrix defines an affine transformation,
+ *          %FALSE otherwise
+ *
+ * Since: 2.4
+ */
+gboolean
+gimp_matrix3_is_affine (const GimpMatrix3 *matrix)
+{
+  return (fabs (matrix->coeff[2][0]) < EPSILON &&
+          fabs (matrix->coeff[2][1]) < EPSILON &&
+          fabs (matrix->coeff[2][2] - 1.0) < EPSILON);
+}
+
+/**
+ * gimp_matrix3_is_simple:
+ * @matrix: The matrix that is to be tested.
+ *
+ * Checks if we'll need to interpolate when applying this matrix as
+ * a transformation.
+ *
+ * Returns: %TRUE if all entries of the upper left 2x2 matrix are
+ *          either 0 or 1, %FALSE otherwise
+ */
+gboolean
+gimp_matrix3_is_simple (const GimpMatrix3 *matrix)
+{
+  gdouble absm;
+  gint    i, j;
+
+  for (i = 0; i < 2; i++)
+    {
+      for (j = 0; j < 2; j++)
+        {
+          absm = fabs (matrix->coeff[i][j]);
+          if (absm > EPSILON && fabs (absm - 1.0) > EPSILON)
+            return FALSE;
+        }
+    }
+
+  return TRUE;
+}
+
+/**
+ * gimp_matrix3_equal:
+ * @matrix1: The first matrix
+ * @matrix2: The second matrix
+ *
+ * Checks if two matrices are equal.
+ *
+ * Returns: %TRUE the matrices are equal, %FALSE otherwise
+ *
+ * Since: 2.10.16
+ */
+gboolean
+gimp_matrix3_equal (const GimpMatrix3 *matrix1,
+                    const GimpMatrix3 *matrix2)
+{
+  gint i, j;
+
+  for (i = 0; i < 3; i++)
+    {
+      for (j = 0; j < 3; j++)
+        {
+          if (fabs (matrix1->coeff[i][j] - matrix2->coeff[i][j]) > EPSILON)
+            return FALSE;
+        }
+    }
+
+  return TRUE;
+}
+
+/**
+ * gimp_matrix4_identity:
+ * @matrix: A matrix.
+ *
+ * Sets the matrix to the identity matrix.
+ *
+ * Since: 2.10.16
+ */
+void
+gimp_matrix4_identity (GimpMatrix4 *matrix)
+{
+  gint i, j;
+
+  for (i = 0; i < 4; i++)
+    {
+      for (j = 0; j < 4; j++)
+        matrix->coeff[i][j] = i == j;
+    }
+}
+
+/**
+ * gimp_matrix4_mult:
+ * @matrix1: The first input matrix.
+ * @matrix2: The second input matrix which will be overwritten by the result.
+ *
+ * Multiplies two matrices and puts the result into the second one.
+ *
+ * Since: 2.10.16
+ */
+void
+gimp_matrix4_mult (const GimpMatrix4 *matrix1,
+                   GimpMatrix4       *matrix2)
+{
+  GimpMatrix4 result = {};
+  gint        i, j, k;
+
+  for (i = 0; i < 4; i++)
+    {
+      for (j = 0; j < 4; j++)
+        {
+          for (k = 0; k < 4; k++)
+            result.coeff[i][j] += matrix1->coeff[i][k] * matrix2->coeff[k][j];
+        }
+    }
+
+  *matrix2 = result;
+}
+
+/**
+ * gimp_matrix4_to_deg:
+ * @matrix:
+ * @a:
+ * @b:
+ * @c:
+ *
+ *
+ **/
+void
+gimp_matrix4_to_deg (const GimpMatrix4 *matrix,
+                     gdouble           *a,
+                     gdouble           *b,
+                     gdouble           *c)
+{
+  *a = 180 * (asin (matrix->coeff[1][0]) / G_PI_2);
+  *b = 180 * (asin (matrix->coeff[2][0]) / G_PI_2);
+  *c = 180 * (asin (matrix->coeff[2][1]) / G_PI_2);
+}
+
+/**
+ * gimp_matrix4_transform_point:
+ * @matrix: The transformation matrix.
+ * @x: The source X coordinate.
+ * @y: The source Y coordinate.
+ * @z: The source Z coordinate.
+ * @newx: The transformed X coordinate.
+ * @newy: The transformed Y coordinate.
+ * @newz: The transformed Z coordinate.
+ *
+ * Transforms a point in 3D as specified by the transformation matrix.
+ *
+ * Returns: The transformed W coordinate.
+ *
+ * Since: 2.10.16
+ */
+gdouble
+gimp_matrix4_transform_point (const GimpMatrix4 *matrix,
+                              gdouble            x,
+                              gdouble            y,
+                              gdouble            z,
+                              gdouble           *newx,
+                              gdouble           *newy,
+                              gdouble           *newz)
+{
+  gdouble neww;
+
+  *newx = matrix->coeff[0][0] * x +
+          matrix->coeff[0][1] * y +
+          matrix->coeff[0][2] * z +
+          matrix->coeff[0][3];
+  *newy = matrix->coeff[1][0] * x +
+          matrix->coeff[1][1] * y +
+          matrix->coeff[1][2] * z +
+          matrix->coeff[1][3];
+  *newz = matrix->coeff[2][0] * x +
+          matrix->coeff[2][1] * y +
+          matrix->coeff[2][2] * z +
+          matrix->coeff[2][3];
+  neww  = matrix->coeff[3][0] * x +
+          matrix->coeff[3][1] * y +
+          matrix->coeff[3][2] * z +
+          matrix->coeff[3][3];
+
+  *newx /= neww;
+  *newy /= neww;
+  *newz /= neww;
+
+  return neww;
+}
diff --git a/libgimpmath/gimpmatrix.h b/libgimpmath/gimpmatrix.h
new file mode 100644
index 0000000..a71a218
--- /dev/null
+++ b/libgimpmath/gimpmatrix.h
@@ -0,0 +1,157 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpmatrix.h
+ * Copyright (C) 1998 Jay Cox <jaycox@gimp.org>
+ *
+ * This library 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 library 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 library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION)
+#error "Only <libgimpmath/gimpmath.h> can be included directly."
+#endif
+
+#ifndef __GIMP_MATRIX_H__
+#define __GIMP_MATRIX_H__
+
+G_BEGIN_DECLS
+
+/* For information look into the C source or the html documentation */
+
+
+/*****************/
+/*  GimpMatrix2  */
+/*****************/
+
+#define GIMP_TYPE_MATRIX2               (gimp_matrix2_get_type ())
+#define GIMP_VALUE_HOLDS_MATRIX2(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_MATRIX2))
+
+GType         gimp_matrix2_get_type        (void) G_GNUC_CONST;
+
+
+#define GIMP_TYPE_PARAM_MATRIX2            (gimp_param_matrix2_get_type ())
+#define GIMP_IS_PARAM_SPEC_MATRIX2(pspec)  (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_MATRIX2))
+
+GType         gimp_param_matrix2_get_type  (void) G_GNUC_CONST;
+
+GParamSpec *  gimp_param_spec_matrix2      (const gchar        *name,
+                                            const gchar        *nick,
+                                            const gchar        *blurb,
+                                            const GimpMatrix2  *default_value,
+                                            GParamFlags         flags);
+
+
+void          gimp_matrix2_identity        (GimpMatrix2       *matrix);
+void          gimp_matrix2_mult            (const GimpMatrix2 *matrix1,
+                                            GimpMatrix2       *matrix2);
+
+gdouble       gimp_matrix2_determinant     (const GimpMatrix2 *matrix);
+void          gimp_matrix2_invert          (GimpMatrix2       *matrix);
+
+void          gimp_matrix2_transform_point (const GimpMatrix2 *matrix,
+                                            gdouble            x,
+                                            gdouble            y,
+                                            gdouble           *newx,
+                                            gdouble           *newy);
+
+
+/*****************/
+/*  GimpMatrix3  */
+/*****************/
+
+#define GIMP_TYPE_MATRIX3               (gimp_matrix3_get_type ())
+#define GIMP_VALUE_HOLDS_MATRIX3(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_MATRIX3))
+
+GType         gimp_matrix3_get_type        (void) G_GNUC_CONST;
+
+
+#define GIMP_TYPE_PARAM_MATRIX3            (gimp_param_matrix3_get_type ())
+#define GIMP_IS_PARAM_SPEC_MATRIX3(pspec)  (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_MATRIX3))
+
+GType         gimp_param_matrix3_get_type  (void) G_GNUC_CONST;
+
+GParamSpec *  gimp_param_spec_matrix3      (const gchar        *name,
+                                            const gchar        *nick,
+                                            const gchar        *blurb,
+                                            const GimpMatrix3  *default_value,
+                                            GParamFlags         flags);
+
+
+void          gimp_matrix3_identity        (GimpMatrix3       *matrix);
+void          gimp_matrix3_mult            (const GimpMatrix3 *matrix1,
+                                            GimpMatrix3       *matrix2);
+void          gimp_matrix3_translate       (GimpMatrix3       *matrix,
+                                            gdouble            x,
+                                            gdouble            y);
+void          gimp_matrix3_scale           (GimpMatrix3       *matrix,
+                                            gdouble            x,
+                                            gdouble            y);
+void          gimp_matrix3_rotate          (GimpMatrix3       *matrix,
+                                            gdouble            theta);
+void          gimp_matrix3_xshear          (GimpMatrix3       *matrix,
+                                            gdouble            amount);
+void          gimp_matrix3_yshear          (GimpMatrix3       *matrix,
+                                            gdouble            amount);
+void          gimp_matrix3_affine          (GimpMatrix3       *matrix,
+                                            gdouble            a,
+                                            gdouble            b,
+                                            gdouble            c,
+                                            gdouble            d,
+                                            gdouble            e,
+                                            gdouble            f);
+
+gdouble       gimp_matrix3_determinant     (const GimpMatrix3 *matrix);
+void          gimp_matrix3_invert          (GimpMatrix3       *matrix);
+
+gboolean      gimp_matrix3_is_identity     (const GimpMatrix3 *matrix);
+gboolean      gimp_matrix3_is_diagonal     (const GimpMatrix3 *matrix);
+gboolean      gimp_matrix3_is_affine       (const GimpMatrix3 *matrix);
+gboolean      gimp_matrix3_is_simple       (const GimpMatrix3 *matrix);
+
+gboolean      gimp_matrix3_equal           (const GimpMatrix3 *matrix1,
+                                            const GimpMatrix3 *matrix2);
+
+void          gimp_matrix3_transform_point (const GimpMatrix3 *matrix,
+                                            gdouble            x,
+                                            gdouble            y,
+                                            gdouble           *newx,
+                                            gdouble           *newy);
+
+
+/*****************/
+/*  GimpMatrix4  */
+/*****************/
+
+void          gimp_matrix4_identity        (GimpMatrix4       *matrix);
+void          gimp_matrix4_mult            (const GimpMatrix4 *matrix1,
+                                            GimpMatrix4       *matrix2);
+
+void          gimp_matrix4_to_deg          (const GimpMatrix4 *matrix,
+                                            gdouble           *a,
+                                            gdouble           *b,
+                                            gdouble           *c);
+
+gdouble       gimp_matrix4_transform_point (const GimpMatrix4 *matrix,
+                                            gdouble            x,
+                                            gdouble            y,
+                                            gdouble            z,
+                                            gdouble           *newx,
+                                            gdouble           *newy,
+                                            gdouble           *newz);
+
+
+G_END_DECLS
+
+#endif /* __GIMP_MATRIX_H__ */
diff --git a/libgimpmath/gimpmd5.c b/libgimpmath/gimpmd5.c
new file mode 100644
index 0000000..712c3a9
--- /dev/null
+++ b/libgimpmath/gimpmd5.c
@@ -0,0 +1,53 @@
+/* LIBGIMP - The GIMP Library
+ *
+ * gimpmd5.c
+ *
+ * Use of this code is deprecated! Use %GChecksum from GLib instead.
+ */
+
+#include "config.h"
+
+#include <glib-object.h>
+
+#include "gimpmathtypes.h"
+
+#include "gimpmd5.h"
+
+
+/**
+ * SECTION: gimpmd5
+ * @title: GimpMD5
+ * @short_description: The MD5 message-digest algorithm
+ *
+ * The MD5 message-digest algorithm
+ **/
+
+
+/**
+ * gimp_md5_get_digest:
+ * @buffer:      byte buffer
+ * @buffer_size: buffer size (in bytes) or -1 if @buffer is nul-terminated.
+ * @digest:      16 bytes buffer receiving the hash code.
+ *
+ * This function is deprecated! Use %GChecksum from GLib instead.
+ *
+ * Get the md5 hash of a buffer. The result is put in the 16 bytes
+ * buffer @digest. For more information see RFC 1321.
+ **/
+void
+gimp_md5_get_digest (const gchar *buffer,
+                     gint         buffer_size,
+                     guchar       digest[16])
+{
+  GChecksum *checksum;
+  gsize      len = 16;
+
+  g_return_if_fail (buffer != NULL);
+  g_return_if_fail (digest != NULL);
+
+  checksum = g_checksum_new (G_CHECKSUM_MD5);
+
+  g_checksum_update (checksum, (const guchar *) buffer, buffer_size);
+  g_checksum_get_digest (checksum, digest, &len);
+  g_checksum_free (checksum);
+}
diff --git a/libgimpmath/gimpmd5.h b/libgimpmath/gimpmd5.h
new file mode 100644
index 0000000..1e04e91
--- /dev/null
+++ b/libgimpmath/gimpmd5.h
@@ -0,0 +1,26 @@
+/* LIBGIMP - The GIMP Library
+ *
+ * gimpmd5.h
+ *
+ * Use of this code is deprecated! Use %GChecksum from GLib instead.
+ */
+
+#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION)
+#error "Only <libgimpmath/gimpmath.h> can be included directly."
+#endif
+
+#ifndef __GIMP_MD5_H__
+#define __GIMP_MD5_H__
+
+G_BEGIN_DECLS
+
+/* For information look into the C source or the html documentation */
+
+GIMP_DEPRECATED_FOR(GChecksum)
+void gimp_md5_get_digest (const gchar *buffer,
+                          gint         buffer_size,
+                          guchar       digest[16]);
+
+G_END_DECLS
+
+#endif  /* __GIMP_MD5_H__ */
diff --git a/libgimpmath/gimpvector.c b/libgimpmath/gimpvector.c
new file mode 100644
index 0000000..5f2b174
--- /dev/null
+++ b/libgimpmath/gimpvector.c
@@ -0,0 +1,1129 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpvector.c
+ *
+ * The gimp_vector* functions were taken from:
+ * GCK - The General Convenience Kit
+ * Copyright (C) 1996 Tom Bech
+ *
+ * This library 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 library 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 library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+/**********************************************/
+/* A little collection of useful vector stuff */
+/**********************************************/
+
+#include "config.h"
+
+#include <glib-object.h>
+
+#include "gimpmath.h"
+
+
+/**
+ * SECTION: gimpvector
+ * @title: GimpVector
+ * @short_description: Utilities to set up and manipulate vectors.
+ * @see_also: #GimpMatrix2, #GimpMatrix3, #GimpMatrix4
+ *
+ * Utilities to set up and manipulate vectors.
+ **/
+
+
+/*************************/
+/* Some useful constants */
+/*************************/
+
+static const GimpVector2 gimp_vector2_zero =   { 0.0, 0.0 };
+#if 0
+static const GimpVector2 gimp_vector2_unit_x = { 1.0, 0.0 };
+static const GimpVector2 gimp_vector2_unit_y = { 0.0, 1.0 };
+#endif
+
+static const GimpVector3 gimp_vector3_zero =   { 0.0, 0.0, 0.0 };
+#if 0
+static const GimpVector3 gimp_vector3_unit_x = { 1.0, 0.0, 0.0 };
+static const GimpVector3 gimp_vector3_unit_y = { 0.0, 1.0, 0.0 };
+static const GimpVector3 gimp_vector3_unit_z = { 0.0, 0.0, 1.0 };
+#endif
+
+/**************************************/
+/* Two   dimensional vector functions */
+/**************************************/
+
+/**
+ * gimp_vector2_new:
+ * @x: the X coordinate.
+ * @y: the Y coordinate.
+ *
+ * Creates a #GimpVector2 of coordinates @x and @y.
+ *
+ * Returns: the resulting #GimpVector2.
+ **/
+GimpVector2
+gimp_vector2_new (gdouble x,
+                  gdouble y)
+{
+  GimpVector2 vector;
+
+  vector.x = x;
+  vector.y = y;
+
+  return vector;
+}
+
+/**
+ * gimp_vector2_set:
+ * @vector: a pointer to a #GimpVector2.
+ * @x: the X coordinate.
+ * @y: the Y coordinate.
+ *
+ * Sets the X and Y coordinates of @vector to @x and @y.
+ **/
+void
+gimp_vector2_set (GimpVector2 *vector,
+                  gdouble      x,
+                  gdouble      y)
+{
+  vector->x = x;
+  vector->y = y;
+}
+
+/**
+ * gimp_vector2_length:
+ * @vector: a pointer to a #GimpVector2.
+ *
+ * Computes the length of a 2D vector.
+ *
+ * Returns: the length of @vector (a positive gdouble).
+ **/
+gdouble
+gimp_vector2_length (const GimpVector2 *vector)
+{
+  return (sqrt (vector->x * vector->x + vector->y * vector->y));
+}
+
+/**
+ * gimp_vector2_length_val:
+ * @vector: a #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_length() but the
+ * vector is passed by value rather than by reference.
+ *
+ * Returns: the length of @vector (a positive gdouble).
+ **/
+gdouble
+gimp_vector2_length_val (GimpVector2 vector)
+{
+  return (sqrt (vector.x * vector.x + vector.y * vector.y));
+}
+
+/**
+ * gimp_vector2_mul:
+ * @vector: a pointer to a #GimpVector2.
+ * @factor: a scalar.
+ *
+ * Multiplies each component of the @vector by @factor. Note that this
+ * is equivalent to multiplying the vectors length by @factor.
+ **/
+void
+gimp_vector2_mul (GimpVector2 *vector,
+                  gdouble      factor)
+{
+  vector->x *= factor;
+  vector->y *= factor;
+}
+
+/**
+ * gimp_vector2_mul_val:
+ * @vector: a #GimpVector2.
+ * @factor: a scalar.
+ *
+ * This function is identical to gimp_vector2_mul() but the vector is
+ * passed by value rather than by reference.
+ *
+ * Returns: the resulting #GimpVector2.
+ **/
+GimpVector2
+gimp_vector2_mul_val (GimpVector2 vector,
+                      gdouble     factor)
+{
+  GimpVector2 result;
+
+  result.x = vector.x * factor;
+  result.y = vector.y * factor;
+
+  return result;
+}
+
+
+/**
+ * gimp_vector2_normalize:
+ * @vector: a pointer to a #GimpVector2.
+ *
+ * Normalizes the @vector so the length of the @vector is 1.0. The nul
+ * vector will not be changed.
+ **/
+void
+gimp_vector2_normalize (GimpVector2 *vector)
+{
+  gdouble len;
+
+  len = gimp_vector2_length (vector);
+
+  if (len != 0.0)
+    {
+      len = 1.0 / len;
+      vector->x *= len;
+      vector->y *= len;
+    }
+  else
+    {
+      *vector = gimp_vector2_zero;
+    }
+}
+
+/**
+ * gimp_vector2_normalize_val:
+ * @vector: a #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_normalize() but the
+ * vector is passed by value rather than by reference.
+ *
+ * Returns: a #GimpVector2 parallel to @vector, pointing in the same
+ * direction but with a length of 1.0.
+ **/
+GimpVector2
+gimp_vector2_normalize_val (GimpVector2 vector)
+{
+  GimpVector2 normalized;
+  gdouble     len;
+
+  len = gimp_vector2_length_val (vector);
+
+  if (len != 0.0)
+    {
+      len = 1.0 / len;
+      normalized.x = vector.x * len;
+      normalized.y = vector.y * len;
+      return normalized;
+    }
+  else
+    {
+      return gimp_vector2_zero;
+    }
+}
+
+/**
+ * gimp_vector2_neg:
+ * @vector: a pointer to a #GimpVector2.
+ *
+ * Negates the @vector (i.e. negate all its coordinates).
+ **/
+void
+gimp_vector2_neg (GimpVector2 *vector)
+{
+  vector->x *= -1.0;
+  vector->y *= -1.0;
+}
+
+/**
+ * gimp_vector2_neg_val:
+ * @vector: a #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_neg() but the vector
+ * is passed by value rather than by reference.
+ *
+ * Returns: the negated #GimpVector2.
+ **/
+GimpVector2
+gimp_vector2_neg_val (GimpVector2 vector)
+{
+  GimpVector2 result;
+
+  result.x = vector.x * -1.0;
+  result.y = vector.y * -1.0;
+
+  return result;
+}
+
+/**
+ * gimp_vector2_add:
+ * @result: destination for the resulting #GimpVector2.
+ * @vector1: a pointer to the first #GimpVector2.
+ * @vector2: a pointer to the second #GimpVector2.
+ *
+ * Computes the sum of two 2D vectors. The resulting #GimpVector2 is
+ * stored in @result.
+ **/
+void
+gimp_vector2_add (GimpVector2       *result,
+                  const GimpVector2 *vector1,
+                  const GimpVector2 *vector2)
+{
+  result->x = vector1->x + vector2->x;
+  result->y = vector1->y + vector2->y;
+}
+
+/**
+ * gimp_vector2_add_val:
+ * @vector1: the first #GimpVector2.
+ * @vector2: the second #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_add() but the vectors
+ * are passed by value rather than by reference.
+ *
+ * Returns: the resulting #GimpVector2.
+ **/
+GimpVector2
+gimp_vector2_add_val (GimpVector2 vector1,
+                      GimpVector2 vector2)
+{
+  GimpVector2 result;
+
+  result.x = vector1.x + vector2.x;
+  result.y = vector1.y + vector2.y;
+
+  return result;
+}
+
+/**
+ * gimp_vector2_sub:
+ * @result: the destination for the resulting #GimpVector2.
+ * @vector1: a pointer to the first #GimpVector2.
+ * @vector2: a pointer to the second #GimpVector2.
+ *
+ * Computes the difference of two 2D vectors (@vector1 minus @vector2).
+ * The resulting #GimpVector2 is stored in @result.
+ **/
+void
+gimp_vector2_sub (GimpVector2       *result,
+                  const GimpVector2 *vector1,
+                  const GimpVector2 *vector2)
+{
+  result->x = vector1->x - vector2->x;
+  result->y = vector1->y - vector2->y;
+}
+
+/**
+ * gimp_vector2_sub_val:
+ * @vector1: the first #GimpVector2.
+ * @vector2: the second #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_sub() but the vectors
+ * are passed by value rather than by reference.
+ *
+ * Returns: the resulting #GimpVector2.
+ **/
+GimpVector2
+gimp_vector2_sub_val (GimpVector2 vector1,
+                      GimpVector2 vector2)
+{
+  GimpVector2 result;
+
+  result.x = vector1.x - vector2.x;
+  result.y = vector1.y - vector2.y;
+
+  return result;
+}
+
+/**
+ * gimp_vector2_inner_product:
+ * @vector1: a pointer to the first #GimpVector2.
+ * @vector2: a pointer to the second #GimpVector2.
+ *
+ * Computes the inner (dot) product of two 2D vectors.
+ * This product is zero if and only if the two vectors are orthogonal.
+ *
+ * Returns: The inner product.
+ **/
+gdouble
+gimp_vector2_inner_product (const GimpVector2 *vector1,
+                            const GimpVector2 *vector2)
+{
+  return (vector1->x * vector2->x + vector1->y * vector2->y);
+}
+
+/**
+ * gimp_vector2_inner_product_val:
+ * @vector1: the first #GimpVector2.
+ * @vector2: the second #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_inner_product() but the
+ * vectors are passed by value rather than by reference.
+ *
+ * Returns: The inner product.
+ **/
+gdouble
+gimp_vector2_inner_product_val (GimpVector2 vector1,
+                                GimpVector2 vector2)
+{
+  return (vector1.x * vector2.x + vector1.y * vector2.y);
+}
+
+/**
+ * gimp_vector2_cross_product:
+ * @vector1: a pointer to the first #GimpVector2.
+ * @vector2: a pointer to the second #GimpVector2.
+ *
+ * Compute the cross product of two vectors. The result is a
+ * #GimpVector2 which is orthogonal to both @vector1 and @vector2. If
+ * @vector1 and @vector2 are parallel, the result will be the nul
+ * vector.
+ *
+ * Note that in 2D, this function is useful to test if two vectors are
+ * parallel or not, or to compute the area spawned by two vectors.
+ *
+ * Returns: The cross product.
+ **/
+GimpVector2
+gimp_vector2_cross_product (const GimpVector2 *vector1,
+                            const GimpVector2 *vector2)
+{
+  GimpVector2 normal;
+
+  normal.x = vector1->x * vector2->y - vector1->y * vector2->x;
+  normal.y = vector1->y * vector2->x - vector1->x * vector2->y;
+
+  return normal;
+}
+
+/**
+ * gimp_vector2_cross_product_val:
+ * @vector1: the first #GimpVector2.
+ * @vector2: the second #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_cross_product() but the
+ * vectors are passed by value rather than by reference.
+ *
+ * Returns: The cross product.
+ **/
+GimpVector2
+gimp_vector2_cross_product_val (GimpVector2 vector1,
+                                GimpVector2 vector2)
+{
+  GimpVector2 normal;
+
+  normal.x = vector1.x * vector2.y - vector1.y * vector2.x;
+  normal.y = vector1.y * vector2.x - vector1.x * vector2.y;
+
+  return normal;
+}
+
+/**
+ * gimp_vector2_rotate:
+ * @vector: a pointer to a #GimpVector2.
+ * @alpha: an angle (in radians).
+ *
+ * Rotates the @vector counterclockwise by @alpha radians.
+ **/
+void
+gimp_vector2_rotate (GimpVector2 *vector,
+                     gdouble      alpha)
+{
+  GimpVector2 result;
+
+  result.x = cos (alpha) * vector->x + sin (alpha) * vector->y;
+  result.y = cos (alpha) * vector->y - sin (alpha) * vector->x;
+
+  *vector = result;
+}
+
+/**
+ * gimp_vector2_rotate_val:
+ * @vector: a #GimpVector2.
+ * @alpha: an angle (in radians).
+ *
+ * This function is identical to gimp_vector2_rotate() but the vector
+ * is passed by value rather than by reference.
+ *
+ * Returns: a #GimpVector2 representing @vector rotated by @alpha
+ * radians.
+ **/
+GimpVector2
+gimp_vector2_rotate_val (GimpVector2 vector,
+                         gdouble     alpha)
+{
+  GimpVector2 result;
+
+  result.x = cos (alpha) * vector.x + sin (alpha) * vector.y;
+  result.y = cos (alpha) * vector.y - sin (alpha) * vector.x;
+
+  return result;
+}
+
+/**
+ * gimp_vector2_normal:
+ * @vector: a pointer to a #GimpVector2.
+ *
+ * Compute a normalized perpendicular vector to @vector
+ *
+ * Returns: a #GimpVector2 perpendicular to @vector, with a length of 1.0.
+ *
+ * Since: 2.8
+ **/
+GimpVector2
+gimp_vector2_normal (GimpVector2 *vector)
+{
+  GimpVector2 result;
+
+  result.x = - vector->y;
+  result.y = vector->x;
+
+  gimp_vector2_normalize (&result);
+
+  return result;
+}
+
+/**
+ * gimp_vector2_normal_val:
+ * @vector: a #GimpVector2.
+ *
+ * This function is identical to gimp_vector2_normal() but the vector
+ * is passed by value rather than by reference.
+ *
+ * Returns: a #GimpVector2 perpendicular to @vector, with a length of 1.0.
+ *
+ * Since: 2.8
+ **/
+GimpVector2
+gimp_vector2_normal_val (GimpVector2 vector)
+{
+  GimpVector2 result;
+
+  result.x = - vector.y;
+  result.y = vector.x;
+
+  gimp_vector2_normalize (&result);
+
+  return result;
+}
+/**************************************/
+/* Three dimensional vector functions */
+/**************************************/
+
+/**
+ * gimp_vector3_new:
+ * @x: the X coordinate.
+ * @y: the Y coordinate.
+ * @z: the Z coordinate.
+ *
+ * Creates a #GimpVector3 of coordinate @x, @y and @z.
+ *
+ * Returns: the resulting #GimpVector3.
+ **/
+GimpVector3
+gimp_vector3_new (gdouble  x,
+                  gdouble  y,
+                  gdouble  z)
+{
+  GimpVector3 vector;
+
+  vector.x = x;
+  vector.y = y;
+  vector.z = z;
+
+  return vector;
+}
+
+/**
+ * gimp_vector3_set:
+ * @vector: a pointer to a #GimpVector3.
+ * @x: the X coordinate.
+ * @y: the Y coordinate.
+ * @z: the Z coordinate.
+ *
+ * Sets the X, Y and Z coordinates of @vector to @x, @y and @z.
+ **/
+void
+gimp_vector3_set (GimpVector3 *vector,
+                  gdouble      x,
+                  gdouble      y,
+                  gdouble      z)
+{
+  vector->x = x;
+  vector->y = y;
+  vector->z = z;
+}
+
+/**
+ * gimp_vector3_length:
+ * @vector: a pointer to a #GimpVector3.
+ *
+ * Computes the length of a 3D vector.
+ *
+ * Returns: the length of @vector (a positive gdouble).
+ **/
+gdouble
+gimp_vector3_length (const GimpVector3 *vector)
+{
+  return (sqrt (vector->x * vector->x +
+                vector->y * vector->y +
+                vector->z * vector->z));
+}
+
+/**
+ * gimp_vector3_length_val:
+ * @vector: a #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_length() but the vector
+ * is passed by value rather than by reference.
+ *
+ * Returns: the length of @vector (a positive gdouble).
+ **/
+gdouble
+gimp_vector3_length_val (GimpVector3 vector)
+{
+  return (sqrt (vector.x * vector.x +
+                vector.y * vector.y +
+                vector.z * vector.z));
+}
+
+/**
+ * gimp_vector3_mul:
+ * @vector: a pointer to a #GimpVector3.
+ * @factor: a scalar.
+ *
+ * Multiplies each component of the @vector by @factor. Note that
+ * this is equivalent to multiplying the vectors length by @factor.
+ **/
+void
+gimp_vector3_mul (GimpVector3 *vector,
+                  gdouble      factor)
+{
+  vector->x *= factor;
+  vector->y *= factor;
+  vector->z *= factor;
+}
+
+/**
+ * gimp_vector3_mul_val:
+ * @vector: a #GimpVector3.
+ * @factor: a scalar.
+ *
+ * This function is identical to gimp_vector3_mul() but the vector is
+ * passed by value rather than by reference.
+ *
+ * Returns: the resulting #GimpVector3.
+ **/
+GimpVector3
+gimp_vector3_mul_val (GimpVector3 vector,
+                      gdouble     factor)
+{
+  GimpVector3 result;
+
+  result.x = vector.x * factor;
+  result.y = vector.y * factor;
+  result.z = vector.z * factor;
+
+  return result;
+}
+
+/**
+ * gimp_vector3_normalize:
+ * @vector: a pointer to a #GimpVector3.
+ *
+ * Normalizes the @vector so the length of the @vector is 1.0. The nul
+ * vector will not be changed.
+ **/
+void
+gimp_vector3_normalize (GimpVector3 *vector)
+{
+  gdouble len;
+
+  len = gimp_vector3_length (vector);
+
+  if (len != 0.0)
+    {
+      len = 1.0 / len;
+      vector->x *= len;
+      vector->y *= len;
+      vector->z *= len;
+    }
+  else
+    {
+      *vector = gimp_vector3_zero;
+    }
+}
+
+/**
+ * gimp_vector3_normalize_val:
+ * @vector: a #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_normalize() but the
+ * vector is passed by value rather than by reference.
+ *
+ * Returns: a #GimpVector3 parallel to @vector, pointing in the same
+ * direction but with a length of 1.0.
+ **/
+GimpVector3
+gimp_vector3_normalize_val (GimpVector3 vector)
+{
+  GimpVector3 result;
+  gdouble     len;
+
+  len = gimp_vector3_length_val (vector);
+
+  if (len != 0.0)
+    {
+      len = 1.0 / len;
+      result.x = vector.x * len;
+      result.y = vector.y * len;
+      result.z = vector.z * len;
+      return result;
+    }
+  else
+    {
+      return gimp_vector3_zero;
+    }
+}
+
+/**
+ * gimp_vector3_neg:
+ * @vector: a pointer to a #GimpVector3.
+ *
+ * Negates the @vector (i.e. negate all its coordinates).
+ **/
+void
+gimp_vector3_neg (GimpVector3 *vector)
+{
+  vector->x *= -1.0;
+  vector->y *= -1.0;
+  vector->z *= -1.0;
+}
+
+/**
+ * gimp_vector3_neg_val:
+ * @vector: a #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_neg() but the vector
+ * is passed by value rather than by reference.
+ *
+ * Returns: the negated #GimpVector3.
+ **/
+GimpVector3
+gimp_vector3_neg_val (GimpVector3 vector)
+{
+  GimpVector3 result;
+
+  result.x = vector.x * -1.0;
+  result.y = vector.y * -1.0;
+  result.z = vector.z * -1.0;
+
+  return result;
+}
+
+/**
+ * gimp_vector3_add:
+ * @result: destination for the resulting #GimpVector3.
+ * @vector1: a pointer to the first #GimpVector3.
+ * @vector2: a pointer to the second #GimpVector3.
+ *
+ * Computes the sum of two 3D vectors. The resulting #GimpVector3 is
+ * stored in @result.
+ **/
+void
+gimp_vector3_add (GimpVector3       *result,
+                  const GimpVector3 *vector1,
+                  const GimpVector3 *vector2)
+{
+  result->x = vector1->x + vector2->x;
+  result->y = vector1->y + vector2->y;
+  result->z = vector1->z + vector2->z;
+}
+
+/**
+ * gimp_vector3_add_val:
+ * @vector1: a #GimpVector3.
+ * @vector2: a #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_add() but the vectors
+ * are passed by value rather than by reference.
+ *
+ * Returns: the resulting #GimpVector3.
+ **/
+GimpVector3
+gimp_vector3_add_val (GimpVector3 vector1,
+                      GimpVector3 vector2)
+{
+  GimpVector3 result;
+
+  result.x = vector1.x + vector2.x;
+  result.y = vector1.y + vector2.y;
+  result.z = vector1.z + vector2.z;
+
+  return result;
+}
+
+/**
+ * gimp_vector3_sub:
+ * @result: the destination for the resulting #GimpVector3.
+ * @vector1: a pointer to the first #GimpVector3.
+ * @vector2: a pointer to the second #GimpVector3.
+ *
+ * Computes the difference of two 3D vectors (@vector1 minus @vector2).
+ * The resulting #GimpVector3 is stored in @result.
+ **/
+void
+gimp_vector3_sub (GimpVector3       *result,
+                  const GimpVector3 *vector1,
+                  const GimpVector3 *vector2)
+{
+  result->x = vector1->x - vector2->x;
+  result->y = vector1->y - vector2->y;
+  result->z = vector1->z - vector2->z;
+}
+
+/**
+ * gimp_vector3_sub_val:
+ * @vector1: a #GimpVector3.
+ * @vector2: a #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_sub() but the vectors
+ * are passed by value rather than by reference.
+ *
+ * Returns: the resulting #GimpVector3.
+ **/
+GimpVector3
+gimp_vector3_sub_val (GimpVector3 vector1,
+                     GimpVector3 vector2)
+{
+  GimpVector3 result;
+
+  result.x = vector1.x - vector2.x;
+  result.y = vector1.y - vector2.y;
+  result.z = vector1.z - vector2.z;
+
+  return result;
+}
+
+/**
+ * gimp_vector3_inner_product:
+ * @vector1: a pointer to the first #GimpVector3.
+ * @vector2: a pointer to the second #GimpVector3.
+ *
+ * Computes the inner (dot) product of two 3D vectors. This product
+ * is zero if and only if the two vectors are orthogonal.
+ *
+ * Returns: The inner product.
+ **/
+gdouble
+gimp_vector3_inner_product (const GimpVector3 *vector1,
+                            const GimpVector3 *vector2)
+{
+  return (vector1->x * vector2->x +
+          vector1->y * vector2->y +
+          vector1->z * vector2->z);
+}
+
+/**
+ * gimp_vector3_inner_product_val:
+ * @vector1: the first #GimpVector3.
+ * @vector2: the second #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_inner_product() but the
+ * vectors are passed by value rather than by reference.
+ *
+ * Returns: The inner product.
+ **/
+gdouble
+gimp_vector3_inner_product_val (GimpVector3 vector1,
+                                GimpVector3 vector2)
+{
+  return (vector1.x * vector2.x +
+          vector1.y * vector2.y +
+          vector1.z * vector2.z);
+}
+
+/**
+ * gimp_vector3_cross_product:
+ * @vector1: a pointer to the first #GimpVector3.
+ * @vector2: a pointer to the second #GimpVector3.
+ *
+ * Compute the cross product of two vectors. The result is a
+ * #GimpVector3 which is orthogonal to both @vector1 and @vector2. If
+ * @vector1 and @vector2 and parallel, the result will be the nul
+ * vector.
+ *
+ * This function can be used to compute the normal of the plane
+ * defined by @vector1 and @vector2.
+ *
+ * Returns: The cross product.
+ **/
+GimpVector3
+gimp_vector3_cross_product (const GimpVector3 *vector1,
+                            const GimpVector3 *vector2)
+{
+  GimpVector3 normal;
+
+  normal.x = vector1->y * vector2->z - vector1->z * vector2->y;
+  normal.y = vector1->z * vector2->x - vector1->x * vector2->z;
+  normal.z = vector1->x * vector2->y - vector1->y * vector2->x;
+
+  return normal;
+}
+
+/**
+ * gimp_vector3_cross_product_val:
+ * @vector1: the first #GimpVector3.
+ * @vector2: the second #GimpVector3.
+ *
+ * This function is identical to gimp_vector3_cross_product() but the
+ * vectors are passed by value rather than by reference.
+ *
+ * Returns: The cross product.
+ **/
+GimpVector3
+gimp_vector3_cross_product_val (GimpVector3 vector1,
+                                GimpVector3 vector2)
+{
+  GimpVector3 normal;
+
+  normal.x = vector1.y * vector2.z - vector1.z * vector2.y;
+  normal.y = vector1.z * vector2.x - vector1.x * vector2.z;
+  normal.z = vector1.x * vector2.y - vector1.y * vector2.x;
+
+  return normal;
+}
+
+/**
+ * gimp_vector3_rotate:
+ * @vector: a pointer to a #GimpVector3.
+ * @alpha: the angle (in radian) of rotation around the Z axis.
+ * @beta: the angle (in radian) of rotation around the Y axis.
+ * @gamma: the angle (in radian) of rotation around the X axis.
+ *
+ * Rotates the @vector around the three axis (Z, Y, and X) by @alpha,
+ * @beta and @gamma, respectively.
+ *
+ * Note that the order of the rotation is very important. If you
+ * expect a vector to be rotated around X, and then around Y, you will
+ * have to call this function twice. Also, it is often wise to call
+ * this function with only one of @alpha, @beta and @gamma non-zero.
+ **/
+void
+gimp_vector3_rotate (GimpVector3 *vector,
+                     gdouble      alpha,
+                     gdouble      beta,
+                     gdouble      gamma)
+{
+  GimpVector3 s, t;
+
+  /* First we rotate it around the Z axis (XY plane).. */
+  /* ================================================= */
+
+  s.x = cos (alpha) * vector->x + sin (alpha) * vector->y;
+  s.y = cos (alpha) * vector->y - sin (alpha) * vector->x;
+
+  /* ..then around the Y axis (XZ plane).. */
+  /* ===================================== */
+
+  t = s;
+
+  vector->x = cos (beta) *t.x       + sin (beta) * vector->z;
+  s.z       = cos (beta) *vector->z - sin (beta) * t.x;
+
+  /* ..and at last around the X axis (YZ plane) */
+  /* ========================================== */
+
+  vector->y = cos (gamma) * t.y + sin (gamma) * s.z;
+  vector->z = cos (gamma) * s.z - sin (gamma) * t.y;
+}
+
+/**
+ * gimp_vector3_rotate_val:
+ * @vector: a #GimpVector3.
+ * @alpha: the angle (in radian) of rotation around the Z axis.
+ * @beta: the angle (in radian) of rotation around the Y axis.
+ * @gamma: the angle (in radian) of rotation around the X axis.
+ *
+ * This function is identical to gimp_vector3_rotate() but the vectors
+ * are passed by value rather than by reference.
+ *
+ * Returns: the rotated vector.
+ **/
+GimpVector3
+gimp_vector3_rotate_val (GimpVector3 vector,
+                         gdouble     alpha,
+                         gdouble     beta,
+                         gdouble     gamma)
+{
+  GimpVector3 s, t, result;
+
+  /* First we rotate it around the Z axis (XY plane).. */
+  /* ================================================= */
+
+  s.x = cos (alpha) * vector.x + sin (alpha) * vector.y;
+  s.y = cos (alpha) * vector.y - sin (alpha) * vector.x;
+
+  /* ..then around the Y axis (XZ plane).. */
+  /* ===================================== */
+
+  t = s;
+
+  result.x = cos (beta) *t.x      + sin (beta) * vector.z;
+  s.z      = cos (beta) *vector.z - sin (beta) * t.x;
+
+  /* ..and at last around the X axis (YZ plane) */
+  /* ========================================== */
+
+  result.y = cos (gamma) * t.y + sin (gamma) * s.z;
+  result.z = cos (gamma) * s.z - sin (gamma) * t.y;
+
+  return result;
+}
+
+/**
+ * gimp_vector_2d_to_3d:
+ * @sx: the abscissa of the upper-left screen rectangle.
+ * @sy: the ordinate of the upper-left screen rectangle.
+ * @w: the width of the screen rectangle.
+ * @h: the height of the screen rectangle.
+ * @x: the abscissa of the point in the screen rectangle to map.
+ * @y: the ordinate of the point in the screen rectangle to map.
+ * @vp: the position of the observer.
+ * @p: the resulting point.
+ *
+ * \"Compute screen (sx, sy) - (sx + w, sy + h) to 3D unit square
+ * mapping. The plane to map to is given in the z field of p. The
+ * observer is located at position vp (vp->z != 0.0).\"
+ *
+ * In other words, this computes the projection of the point (@x, @y)
+ * to the plane z = @p->z (parallel to XY), from the @vp point of view
+ * through the screen (@sx, @sy)->(@sx + @w, @sy + @h)
+ **/
+
+void
+gimp_vector_2d_to_3d (gint               sx,
+                      gint               sy,
+                      gint               w,
+                      gint               h,
+                      gint               x,
+                      gint               y,
+                      const GimpVector3 *vp,
+                      GimpVector3       *p)
+{
+  gdouble t = 0.0;
+
+  if (vp->x != 0.0)
+    t = (p->z - vp->z) / vp->z;
+
+  if (t != 0.0)
+    {
+      p->x = vp->x + t * (vp->x - ((gdouble) (x - sx) / (gdouble) w));
+      p->y = vp->y + t * (vp->y - ((gdouble) (y - sy) / (gdouble) h));
+    }
+  else
+    {
+      p->x = (gdouble) (x - sx) / (gdouble) w;
+      p->y = (gdouble) (y - sy) / (gdouble) h;
+    }
+}
+
+/**
+ * gimp_vector_2d_to_3d_val:
+ * @sx: the abscissa of the upper-left screen rectangle.
+ * @sy: the ordinate of the upper-left screen rectangle.
+ * @w: the width of the screen rectangle.
+ * @h: the height of the screen rectangle.
+ * @x: the abscissa of the point in the screen rectangle to map.
+ * @y: the ordinate of the point in the screen rectangle to map.
+ * @vp: position of the observer.
+ * @p: the resulting point.
+ *
+ * This function is identical to gimp_vector_2d_to_3d() but the
+ * position of the @observer and the resulting point @p are passed by
+ * value rather than by reference.
+ *
+ * Returns: the computed #GimpVector3 point.
+ **/
+GimpVector3
+gimp_vector_2d_to_3d_val (gint        sx,
+                          gint        sy,
+                          gint        w,
+                          gint        h,
+                          gint        x,
+                          gint        y,
+                          GimpVector3 vp,
+                          GimpVector3 p)
+{
+  GimpVector3 result;
+  gdouble     t = 0.0;
+
+  if (vp.x != 0.0)
+    t = (p.z - vp.z) / vp.z;
+
+  if (t != 0.0)
+    {
+      result.x = vp.x + t * (vp.x - ((gdouble) (x - sx) / (gdouble) w));
+      result.y = vp.y + t * (vp.y - ((gdouble) (y - sy) / (gdouble) h));
+    }
+  else
+    {
+      result.x = (gdouble) (x - sx) / (gdouble) w;
+      result.y = (gdouble) (y - sy) / (gdouble) h;
+    }
+
+  result.z = 0;
+  return result;
+}
+
+/**
+ * gimp_vector_3d_to_2d:
+ * @sx: the abscissa of the upper-left screen rectangle.
+ * @sy: the ordinate of the upper-left screen rectangle.
+ * @w: the width of the screen rectangle.
+ * @h: the height of the screen rectangle.
+ * @x: the abscissa of the point in the screen rectangle to map (return value).
+ * @y: the ordinate of the point in the screen rectangle to map (return value).
+ * @vp: position of the observer.
+ * @p: the 3D point to project to the plane.
+ *
+ * Convert the given 3D point to 2D (project it onto the viewing
+ * plane, (sx, sy, 0) - (sx + w, sy + h, 0). The input is assumed to
+ * be in the unit square (0, 0, z) - (1, 1, z). The viewpoint of the
+ * observer is passed in vp.
+ *
+ * This is basically the opposite of gimp_vector_2d_to_3d().
+ **/
+void
+gimp_vector_3d_to_2d (gint               sx,
+                      gint               sy,
+                      gint               w,
+                      gint               h,
+                      gdouble           *x,
+                      gdouble           *y,
+                      const GimpVector3 *vp,
+                      const GimpVector3 *p)
+{
+  gdouble     t;
+  GimpVector3 dir;
+
+  gimp_vector3_sub (&dir, p, vp);
+  gimp_vector3_normalize (&dir);
+
+  if (dir.z != 0.0)
+    {
+      t = (-1.0 * vp->z) / dir.z;
+      *x = (gdouble) sx + ((vp->x + t * dir.x) * (gdouble) w);
+      *y = (gdouble) sy + ((vp->y + t * dir.y) * (gdouble) h);
+    }
+  else
+    {
+      *x = (gdouble) sx + (p->x * (gdouble) w);
+      *y = (gdouble) sy + (p->y * (gdouble) h);
+    }
+}
diff --git a/libgimpmath/gimpvector.h b/libgimpmath/gimpvector.h
new file mode 100644
index 0000000..77230da
--- /dev/null
+++ b/libgimpmath/gimpvector.h
@@ -0,0 +1,160 @@
+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpvector.h
+ *
+ * The gimp_vector* functions were taken from:
+ * GCK - The General Convenience Kit
+ * Copyright (C) 1996 Tom Bech
+ *
+ * This library 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 library 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 library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#if !defined (__GIMP_MATH_H_INSIDE__) && !defined (GIMP_MATH_COMPILATION)
+#error "Only <libgimpmath/gimpmath.h> can be included directly."
+#endif
+
+#ifndef __GIMP_VECTOR_H__
+#define __GIMP_VECTOR_H__
+
+G_BEGIN_DECLS
+
+/* For information look into the C source or the html documentation */
+
+
+/* Two dimensional vector functions */
+/* ================================ */
+
+GimpVector2 gimp_vector2_new               (gdouble            x,
+                                            gdouble            y);
+void        gimp_vector2_set               (GimpVector2       *vector,
+                                            gdouble            x,
+                                            gdouble            y);
+gdouble     gimp_vector2_length            (const GimpVector2 *vector);
+gdouble     gimp_vector2_length_val        (GimpVector2        vector);
+void        gimp_vector2_mul               (GimpVector2       *vector,
+                                            gdouble            factor);
+GimpVector2 gimp_vector2_mul_val           (GimpVector2        vector,
+                                            gdouble            factor);
+void        gimp_vector2_normalize         (GimpVector2       *vector);
+GimpVector2 gimp_vector2_normalize_val     (GimpVector2        vector);
+void        gimp_vector2_neg               (GimpVector2       *vector);
+GimpVector2 gimp_vector2_neg_val           (GimpVector2        vector);
+void        gimp_vector2_add               (GimpVector2       *result,
+                                            const GimpVector2 *vector1,
+                                            const GimpVector2 *vector2);
+GimpVector2 gimp_vector2_add_val           (GimpVector2        vector1,
+                                            GimpVector2        vector2);
+void        gimp_vector2_sub               (GimpVector2       *result,
+                                            const GimpVector2 *vector1,
+                                            const GimpVector2 *vector2);
+GimpVector2 gimp_vector2_sub_val           (GimpVector2        vector1,
+                                            GimpVector2        vector2);
+gdouble     gimp_vector2_inner_product     (const GimpVector2 *vector1,
+                                            const GimpVector2 *vector2);
+gdouble     gimp_vector2_inner_product_val (GimpVector2        vector1,
+                                            GimpVector2        vector2);
+GimpVector2 gimp_vector2_cross_product     (const GimpVector2 *vector1,
+                                            const GimpVector2 *vector2);
+GimpVector2 gimp_vector2_cross_product_val (GimpVector2        vector1,
+                                            GimpVector2        vector2);
+void        gimp_vector2_rotate            (GimpVector2       *vector,
+                                            gdouble            alpha);
+GimpVector2 gimp_vector2_rotate_val        (GimpVector2        vector,
+                                            gdouble            alpha);
+GimpVector2 gimp_vector2_normal            (GimpVector2       *vector);
+GimpVector2 gimp_vector2_normal_val        (GimpVector2        vector);
+
+/* Three dimensional vector functions */
+/* ================================== */
+
+GimpVector3 gimp_vector3_new               (gdouble            x,
+                                            gdouble            y,
+                                            gdouble            z);
+void        gimp_vector3_set               (GimpVector3       *vector,
+                                            gdouble            x,
+                                            gdouble            y,
+                                            gdouble            z);
+gdouble     gimp_vector3_length            (const GimpVector3 *vector);
+gdouble     gimp_vector3_length_val        (GimpVector3        vector);
+void        gimp_vector3_mul               (GimpVector3       *vector,
+                                            gdouble            factor);
+GimpVector3 gimp_vector3_mul_val           (GimpVector3        vector,
+                                            gdouble            factor);
+void        gimp_vector3_normalize         (GimpVector3       *vector);
+GimpVector3 gimp_vector3_normalize_val     (GimpVector3        vector);
+void        gimp_vector3_neg               (GimpVector3       *vector);
+GimpVector3 gimp_vector3_neg_val           (GimpVector3        vector);
+void        gimp_vector3_add               (GimpVector3       *result,
+                                            const GimpVector3 *vector1,
+                                            const GimpVector3 *vector2);
+GimpVector3 gimp_vector3_add_val           (GimpVector3        vector1,
+                                            GimpVector3        vector2);
+void        gimp_vector3_sub               (GimpVector3       *result,
+                                            const GimpVector3 *vector1,
+                                            const GimpVector3 *vector2);
+GimpVector3 gimp_vector3_sub_val           (GimpVector3        vector1,
+                                            GimpVector3        vector2);
+gdouble     gimp_vector3_inner_product     (const GimpVector3 *vector1,
+                                            const GimpVector3 *vector2);
+gdouble     gimp_vector3_inner_product_val (GimpVector3        vector1,
+                                            GimpVector3        vector2);
+GimpVector3 gimp_vector3_cross_product     (const GimpVector3 *vector1,
+                                            const GimpVector3 *vector2);
+GimpVector3 gimp_vector3_cross_product_val (GimpVector3        vector1,
+                                            GimpVector3        vector2);
+void        gimp_vector3_rotate            (GimpVector3       *vector,
+                                            gdouble            alpha,
+                                            gdouble            beta,
+                                            gdouble            gamma);
+GimpVector3 gimp_vector3_rotate_val        (GimpVector3        vector,
+                                            gdouble            alpha,
+                                            gdouble            beta,
+                                            gdouble            gamma);
+
+/* 2d <-> 3d Vector projection functions */
+/* ===================================== */
+
+void        gimp_vector_2d_to_3d           (gint               sx,
+                                            gint               sy,
+                                            gint               w,
+                                            gint               h,
+                                            gint               x,
+                                            gint               y,
+                                            const GimpVector3 *vp,
+                                            GimpVector3       *p);
+
+GimpVector3 gimp_vector_2d_to_3d_val       (gint               sx,
+                                            gint               sy,
+                                            gint               w,
+                                            gint               h,
+                                            gint               x,
+                                            gint               y,
+                                            GimpVector3        vp,
+                                            GimpVector3        p);
+
+void        gimp_vector_3d_to_2d           (gint               sx,
+                                            gint               sy,
+                                            gint               w,
+                                            gint               h,
+                                            gdouble           *x,
+                                            gdouble           *y,
+                                            const GimpVector3 *vp,
+                                            const GimpVector3 *p);
+
+
+G_END_DECLS
+
+#endif  /* __GIMP_VECTOR_H__ */