add cairo

10 files changed, 2353 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/test/pdiff/Makefile.am b/libs/cairo-1.16.0/test/pdiff/Makefile.am
new file mode 100644
index 0000000..73098da
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/Makefile.am
@@ -0,0 +1,19 @@
+include $(top_srcdir)/build/Makefile.am.common
+
+EXTRA_PROGRAMS += perceptualdiff
+EXTRA_DIST += gpl.txt
+
+noinst_LTLIBRARIES = libpdiff.la
+libpdiff_la_SOURCES = 		\
+	pdiff.h			\
+	lpyramid.c		\
+	lpyramid.h		\
+	pdiff.c
+
+perceptualdiff_SOURCES =	\
+	args.c			\
+	args.h			\
+	perceptualdiff.c
+
+AM_CPPFLAGS = -I$(top_srcdir)/src -I$(top_builddir)/src $(CAIRO_CFLAGS)
+LDADD = libpdiff.la $(top_builddir)/src/libcairo.la
diff --git a/libs/cairo-1.16.0/test/pdiff/Makefile.in b/libs/cairo-1.16.0/test/pdiff/Makefile.in
new file mode 100644
index 0000000..9050588
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/Makefile.in
@@ -0,0 +1,1120 @@
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+# with or without modifications, as long as this notice is preserved.
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+	$(AM_V_CCLD)$(LINK)  $(libpdiff_la_OBJECTS) $(libpdiff_la_LIBADD) $(LIBS)
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+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+perceptualdiff$(EXEEXT): $(perceptualdiff_OBJECTS) $(perceptualdiff_DEPENDENCIES) $(EXTRA_perceptualdiff_DEPENDENCIES) 
+	@rm -f perceptualdiff$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(perceptualdiff_OBJECTS) $(perceptualdiff_LDADD) $(LIBS)
+
+mostlyclean-compile:
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+distclean-compile:
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+	  if test $$# -gt 0; then \
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+GTAGS:
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+distclean-tags:
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+
+# Recover from deleted '.trs' file; this should ensure that
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+	$(MAKE) $(AM_MAKEFLAGS) $<
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+	  redo_results=`for i in $$redo_bases; do echo $$i.trs; done`; \
+	  if $(am__make_dryrun); then :; else \
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+	  fi; \
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+	fi; \
+	if $(am__make_dryrun); then :; else \
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+	  for i in $$redo_bases; do \
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+	    test -f $$i.log && test -r $$i.log \
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+	  done; \
+	  test $$st -eq 0 || exit 1; \
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+	@$(am__sh_e_setup); $(am__tty_colors); $(am__set_TESTS_bases); \
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+	results=`for b in $$bases; do echo $$b.trs; done`; \
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+	error=`grep "^$$ws*:test-result:$$ws*ERROR" $$results | wc -l`; \
+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
+	else \
+	  success=false; \
+	fi; \
+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
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+	create_testsuite_report () \
+	{ \
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+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary for $(PACKAGE_STRING)$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
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+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
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+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
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+
+distdir: $(DISTFILES)
+	@srcdirstrip=`echo "$(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
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) check-am
+all-am: Makefile $(LTLIBRARIES)
+installdirs:
+install: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(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:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(DISTCLEANFILES)" || rm -f $(DISTCLEANFILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(BUILT_SOURCES)" || rm -f $(BUILT_SOURCES)
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-checkPROGRAMS clean-generic clean-libtool \
+	clean-noinstLTLIBRARIES mostlyclean-am
+
+distclean: distclean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: all check check-am install install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am check check-TESTS check-am clean \
+	clean-checkPROGRAMS clean-generic clean-libtool \
+	clean-noinstLTLIBRARIES cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am recheck tags tags-am uninstall \
+	uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/libs/cairo-1.16.0/test/pdiff/args.c b/libs/cairo-1.16.0/test/pdiff/args.c
new file mode 100644
index 0000000..ac3aa83
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/args.c
@@ -0,0 +1,119 @@
+/*
+  Comapre Args
+  Copyright (C) 2006 Yangli Hector Yee
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#include "args.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const char* copyright =
+"PerceptualDiff version 1.0, Copyright (C) 2006 Yangli Hector Yee\n\
+PerceptualDiff comes with ABSOLUTELY NO WARRANTY;\n\
+This is free software, and you are welcome\n\
+to redistribute it under certain conditions;\n\
+See the GPL page for details: http://www.gnu.org/copyleft/gpl.html\n\n";
+
+static const char *usage =
+"PeceptualDiff image1.tif image2.tif\n\n\
+   Compares image1.tif and image2.tif using a perceptually based image metric\n\
+   Options:\n\
+\t-verbose       : Turns on verbose mode\n\
+\t-fov deg       : Field of view in degrees (0.1 to 89.9)\n\
+\t-threshold p	 : #pixels p below which differences are ignored\n\
+\t-gamma g       : Value to convert rgb into linear space (default 2.2)\n\
+\t-luminance l   : White luminance (default 100.0 cdm^-2)\n\
+\n\
+\n Note: Input files can also be in the PNG format\
+\n";
+
+void
+args_init (args_t *args)
+{
+    args->surface_a = NULL;
+    args->surface_b = NULL;
+    args->Verbose = false;
+    args->FieldOfView = 45.0f;
+    args->Gamma = 2.2f;
+    args->ThresholdPixels = 100;
+    args->Luminance = 100.0f;
+}
+
+void
+args_fini (args_t *args)
+{
+    cairo_surface_destroy (args->surface_a);
+    cairo_surface_destroy (args->surface_b);
+}
+
+bool
+args_parse (args_t *args, int argc, char **argv)
+{
+    int i;
+    if (argc < 3) {
+	fprintf (stderr, "%s", copyright);
+	fprintf (stderr, "%s", usage);
+	return false;
+    }
+    for (i = 0; i < argc; i++) {
+	if (i == 1) {
+	    args->surface_a = cairo_image_surface_create_from_png (argv[1]);
+	    if (cairo_surface_status (args->surface_a))
+	    {
+		fprintf (stderr, "FAIL: Cannot open %s: %s\n",
+			 argv[1], cairo_status_to_string (cairo_surface_status (args->surface_a)));
+		return false;
+	    }
+	} else if (i == 2) {
+	    args->surface_b = cairo_image_surface_create_from_png (argv[2]);
+	    if (cairo_surface_status (args->surface_b))
+	    {
+		fprintf (stderr, "FAIL: Cannot open %s: %s\n",
+			 argv[2], cairo_status_to_string (cairo_surface_status (args->surface_b)));
+		return false;
+	    }
+	} else {
+	    if (strstr(argv[i], "-fov")) {
+		if (i + 1 < argc) {
+		    args->FieldOfView = (float) atof(argv[i + 1]);
+		}
+	    } else if (strstr(argv[i], "-verbose")) {
+		args->Verbose = true;
+	    } else 	if (strstr(argv[i], "-threshold")) {
+		if (i + 1 < argc) {
+		    args->ThresholdPixels = atoi(argv[i + 1]);
+		}
+	    } else 	if (strstr(argv[i], "-gamma")) {
+		if (i + 1 < argc) {
+		    args->Gamma = (float) atof(argv[i + 1]);
+		}
+	    }else 	if (strstr(argv[i], "-luminance")) {
+		if (i + 1 < argc) {
+		    args->Luminance = (float) atof(argv[i + 1]);
+		}
+	    }
+	}
+    } /* i */
+    return true;
+}
+
+void
+args_print (args_t *args)
+{
+    printf("Field of view is %f degrees\n", args->FieldOfView);
+    printf("Threshold pixels is %d pixels\n", args->ThresholdPixels);
+    printf("The Gamma is %f\n", args->Gamma);
+    printf("The Display's luminance is %f candela per meter squared\n", args->Luminance);
+}
diff --git a/libs/cairo-1.16.0/test/pdiff/args.h b/libs/cairo-1.16.0/test/pdiff/args.h
new file mode 100644
index 0000000..5020239
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/args.h
@@ -0,0 +1,46 @@
+/*
+  Comapre Args
+  Copyright (C) 2006 Yangli Hector Yee
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#ifndef _ARGS_H
+#define _ARGS_H
+
+#include "pdiff.h"
+
+/* Args to pass into the comparison function */
+typedef struct _args
+{
+    cairo_surface_t	*surface_a;		/* Image A */
+    cairo_surface_t	*surface_b;		/* Image B */
+    bool		Verbose;		/* Print lots of text or not */
+    float		FieldOfView;		/* Field of view in degrees */
+    float		Gamma;			/* The gamma to convert to linear color space */
+    float		Luminance;		/* the display's luminance */
+    unsigned int	ThresholdPixels;	/* How many pixels different to ignore */
+} args_t;
+
+void
+args_init (args_t *args);
+
+void
+args_fini (args_t *args);
+
+bool
+args_parse (args_t *args, int argc, char **argv);
+
+void
+args_print (args_t *args);
+
+#endif
diff --git a/libs/cairo-1.16.0/test/pdiff/gpl.txt b/libs/cairo-1.16.0/test/pdiff/gpl.txt
new file mode 100644
index 0000000..f90922e
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/gpl.txt
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
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+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
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+that everyone understands that there is no warranty for this free
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/libs/cairo-1.16.0/test/pdiff/lpyramid.c b/libs/cairo-1.16.0/test/pdiff/lpyramid.c
new file mode 100644
index 0000000..bd402c7
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/lpyramid.c
@@ -0,0 +1,116 @@
+/*
+  Laplacian Pyramid
+  Copyright (C) 2006 Yangli Hector Yee
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#include "lpyramid.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct _lpyramid {
+    /* Successively blurred versions of the original image */
+    float *levels[MAX_PYR_LEVELS];
+
+    int width;
+    int height;
+};
+
+static void
+convolve (lpyramid_t *pyramid, float *a, const float *b)
+/* convolves image b with the filter kernel and stores it in a */
+{
+    int y,x,i,j;
+    const float Kernel[] = {0.05f, 0.25f, 0.4f, 0.25f, 0.05f};
+    int width = pyramid->width;
+    int height = pyramid->height;
+
+    for (y=0; y<height; y++) {
+	for (x=0; x<width; x++) {
+	    float sum = 0.f;
+	    for (j=-2; j<=2; j++) {
+		float sum_i = 0.f;
+		int ny=y+j;
+		if (ny<0) ny=-ny;
+		if (ny>=height) ny=2*height - ny - 1;
+		ny *= width;
+		for (i=-2; i<=2; i++) {
+		    int nx=x+i;
+		    if (nx<0) nx=-nx;
+		    if (nx>=width) nx=2*width - nx - 1;
+		    sum_i += Kernel[i+2] * b[ny + nx];
+		}
+		sum += sum_i * Kernel[j+2];
+	    }
+	    *a++ = sum;
+	}
+    }
+}
+
+/*
+ * Construction/Destruction
+ */
+
+lpyramid_t *
+lpyramid_create (float *image, int width, int height)
+{
+    lpyramid_t *pyramid;
+    int i;
+
+    pyramid = malloc (sizeof (lpyramid_t));
+    if (pyramid == NULL) {
+	fprintf (stderr, "Out of memory.\n");
+	exit (1);
+    }
+    pyramid->width = width;
+    pyramid->height = height;
+
+    /* Make the Laplacian pyramid by successively
+     * copying the earlier levels and blurring them */
+    for (i=0; i<MAX_PYR_LEVELS; i++) {
+	pyramid->levels[i] = malloc (width * height * sizeof (float));
+	if (pyramid->levels[i] == NULL) {
+	    fprintf (stderr, "Out of memory.\n");
+	    exit (1);
+	}
+	if (i == 0) {
+	    memcpy (pyramid->levels[i], image, width * height * sizeof (float));
+	} else {
+	    convolve(pyramid, pyramid->levels[i], pyramid->levels[i - 1]);
+	}
+    }
+
+    return pyramid;
+}
+
+void
+lpyramid_destroy (lpyramid_t *pyramid)
+{
+    int i;
+
+    for (i=0; i<MAX_PYR_LEVELS; i++)
+	free (pyramid->levels[i]);
+
+    free (pyramid);
+}
+
+float
+lpyramid_get_value (lpyramid_t *pyramid, int x, int y, int level)
+{
+    int index = x + y * pyramid->width;
+    int l = level;
+    if (l > MAX_PYR_LEVELS)
+        l = MAX_PYR_LEVELS;
+    return pyramid->levels[l][index];
+}
diff --git a/libs/cairo-1.16.0/test/pdiff/lpyramid.h b/libs/cairo-1.16.0/test/pdiff/lpyramid.h
new file mode 100644
index 0000000..e47a66e
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/lpyramid.h
@@ -0,0 +1,32 @@
+/*
+  Laplacian Pyramid
+  Copyright (C) 2006 Yangli Hector Yee
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+#ifndef _LPYRAMID_H
+#define _LPYRAMID_H
+
+#define MAX_PYR_LEVELS 8
+
+typedef struct _lpyramid lpyramid_t;
+
+lpyramid_t *
+lpyramid_create (float *image, int width, int height);
+
+void
+lpyramid_destroy (lpyramid_t *pyramid);
+
+float
+lpyramid_get_value (lpyramid_t *pyramid, int x, int y, int level);
+
+#endif /* _LPYRAMID_H */
diff --git a/libs/cairo-1.16.0/test/pdiff/pdiff.c b/libs/cairo-1.16.0/test/pdiff/pdiff.c
new file mode 100644
index 0000000..eb5f156
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/pdiff.c
@@ -0,0 +1,420 @@
+/*
+  Metric
+  Copyright (C) 2006 Yangli Hector Yee
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#define _GNU_SOURCE
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "lpyramid.h"
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if   HAVE_STDINT_H
+# include <stdint.h>
+#elif HAVE_INTTYPES_H
+# include <inttypes.h>
+#elif HAVE_SYS_INT_TYPES_H
+# include <sys/int_types.h>
+#elif defined(_MSC_VER)
+  typedef __int8 int8_t;
+  typedef unsigned __int8 uint8_t;
+  typedef __int16 int16_t;
+  typedef unsigned __int16 uint16_t;
+  typedef __int32 int32_t;
+  typedef unsigned __int32 uint32_t;
+  typedef __int64 int64_t;
+  typedef unsigned __int64 uint64_t;
+# ifndef HAVE_UINT64_T
+#  define HAVE_UINT64_T 1
+# endif
+# ifndef INT16_MIN
+#  define INT16_MIN	(-32767-1)
+# endif
+# ifndef INT16_MAX
+#  define INT16_MAX	(32767)
+# endif
+# ifndef UINT16_MAX
+#  define UINT16_MAX	(65535)
+# endif
+#else
+#error Cannot find definitions for fixed-width integral types (uint8_t, uint32_t, etc.)
+#endif
+
+#include "pdiff.h"
+
+#ifndef M_PI
+#define M_PI 3.14159265f
+#endif
+
+#ifndef __USE_ISOC99
+#define expf	exp
+#define powf	pow
+#define fabsf	fabs
+#define sqrtf	sqrt
+#define log10f	log10
+#endif
+
+/*
+ * Given the adaptation luminance, this function returns the
+ * threshold of visibility in cd per m^2
+ * TVI means Threshold vs Intensity function
+ * This version comes from Ward Larson Siggraph 1997
+ */
+static float
+tvi (float adaptation_luminance)
+{
+    /* returns the threshold luminance given the adaptation luminance
+       units are candelas per meter squared
+    */
+    float log_a, r, result;
+    log_a = log10f(adaptation_luminance);
+
+    if (log_a < -3.94f) {
+	r = -2.86f;
+    } else if (log_a < -1.44f) {
+	r = powf(0.405f * log_a + 1.6f , 2.18f) - 2.86f;
+    } else if (log_a < -0.0184f) {
+	r = log_a - 0.395f;
+    } else if (log_a < 1.9f) {
+	r = powf(0.249f * log_a + 0.65f, 2.7f) - 0.72f;
+    } else {
+	r = log_a - 1.255f;
+    }
+
+    result = powf(10.0f , r);
+
+    return result;
+}
+
+/* computes the contrast sensitivity function (Barten SPIE 1989)
+ * given the cycles per degree (cpd) and luminance (lum)
+ */
+static float
+csf (float cpd, float lum)
+{
+    float a, b, result;
+
+    a = 440.0f * powf((1.0f + 0.7f / lum), -0.2f);
+    b = 0.3f * powf((1.0f + 100.0f / lum), 0.15f);
+
+    result = a * cpd * expf(-b * cpd) * sqrtf(1.0f + 0.06f * expf(b * cpd));
+
+    return result;
+}
+
+/*
+ * Visual Masking Function
+ * from Daly 1993
+ */
+static float
+mask (float contrast)
+{
+    float a, b, result;
+    a = powf(392.498f * contrast,  0.7f);
+    b = powf(0.0153f * a, 4.0f);
+    result = powf(1.0f + b, 0.25f);
+
+    return result;
+}
+
+/* convert Adobe RGB (1998) with reference white D65 to XYZ */
+static void
+AdobeRGBToXYZ (float r, float g, float b, float *x, float *y, float *z)
+{
+    /* matrix is from http://www.brucelindbloom.com/ */
+    *x = r * 0.576700f + g * 0.185556f + b * 0.188212f;
+    *y = r * 0.297361f + g * 0.627355f + b * 0.0752847f;
+    *z = r * 0.0270328f + g * 0.0706879f + b * 0.991248f;
+}
+
+static void
+XYZToLAB (float x, float y, float z, float *L, float *A, float *B)
+{
+    static float xw = -1;
+    static float yw;
+    static float zw;
+    const float epsilon  = 216.0f / 24389.0f;
+    const float kappa = 24389.0f / 27.0f;
+    float f[3];
+    float r[3];
+    int i;
+
+    /* reference white */
+    if (xw < 0) {
+	AdobeRGBToXYZ(1, 1, 1, &xw, &yw, &zw);
+    }
+    r[0] = x / xw;
+    r[1] = y / yw;
+    r[2] = z / zw;
+    for (i = 0; i < 3; i++) {
+	if (r[i] > epsilon) {
+	    f[i] = powf(r[i], 1.0f / 3.0f);
+	} else {
+	    f[i] = (kappa * r[i] + 16.0f) / 116.0f;
+	}
+    }
+    *L = 116.0f * f[1] - 16.0f;
+    *A = 500.0f * (f[0] - f[1]);
+    *B = 200.0f * (f[1] - f[2]);
+}
+
+static uint32_t
+_get_pixel (const uint32_t *data, int i)
+{
+    return data[i];
+}
+
+static unsigned char
+_get_red (const uint32_t *data, int i)
+{
+    uint32_t pixel;
+    uint8_t alpha;
+
+    pixel = _get_pixel (data, i);
+    alpha = (pixel & 0xff000000) >> 24;
+    if (alpha == 0)
+	return 0;
+    else
+	return (((pixel & 0x00ff0000) >> 16) * 255 + alpha / 2) / alpha;
+}
+
+static unsigned char
+_get_green (const uint32_t *data, int i)
+{
+    uint32_t pixel;
+    uint8_t alpha;
+
+    pixel = _get_pixel (data, i);
+    alpha = (pixel & 0xff000000) >> 24;
+    if (alpha == 0)
+	return 0;
+    else
+	return (((pixel & 0x0000ff00) >> 8) * 255 + alpha / 2) / alpha;
+}
+
+static unsigned char
+_get_blue (const uint32_t *data, int i)
+{
+    uint32_t pixel;
+    uint8_t alpha;
+
+    pixel = _get_pixel (data, i);
+    alpha = (pixel & 0xff000000) >> 24;
+    if (alpha == 0)
+	return 0;
+    else
+	return (((pixel & 0x000000ff) >> 0) * 255 + alpha / 2) / alpha;
+}
+
+static void *
+xmalloc (size_t size)
+{
+    void *buf;
+
+    buf = malloc (size);
+    if (buf == NULL) {
+	fprintf (stderr, "Out of memory.\n");
+	exit (1);
+    }
+
+    return buf;
+}
+
+int
+pdiff_compare (cairo_surface_t *surface_a,
+	       cairo_surface_t *surface_b,
+	       double gamma,
+	       double luminance,
+	       double field_of_view)
+{
+    unsigned int dim = (cairo_image_surface_get_width (surface_a)
+			* cairo_image_surface_get_height (surface_a));
+    unsigned int i;
+
+    /* assuming colorspaces are in Adobe RGB (1998) convert to XYZ */
+    float *aX;
+    float *aY;
+    float *aZ;
+    float *bX;
+    float *bY;
+    float *bZ;
+    float *aLum;
+    float *bLum;
+
+    float *aA;
+    float *bA;
+    float *aB;
+    float *bB;
+
+    unsigned int x, y, w, h;
+
+    lpyramid_t *la, *lb;
+
+    float num_one_degree_pixels, pixels_per_degree, num_pixels;
+    unsigned int adaptation_level;
+
+    float cpd[MAX_PYR_LEVELS];
+    float F_freq[MAX_PYR_LEVELS - 2];
+    float csf_max;
+    const uint32_t *data_a, *data_b;
+
+    unsigned int pixels_failed;
+
+    w = cairo_image_surface_get_width (surface_a);
+    h = cairo_image_surface_get_height (surface_a);
+    if (w < 3 || h < 3) /* too small for the Laplacian convolution */
+	return -1;
+
+    aX = xmalloc (dim * sizeof (float));
+    aY = xmalloc (dim * sizeof (float));
+    aZ = xmalloc (dim * sizeof (float));
+    bX = xmalloc (dim * sizeof (float));
+    bY = xmalloc (dim * sizeof (float));
+    bZ = xmalloc (dim * sizeof (float));
+    aLum = xmalloc (dim * sizeof (float));
+    bLum = xmalloc (dim * sizeof (float));
+
+    aA = xmalloc (dim * sizeof (float));
+    bA = xmalloc (dim * sizeof (float));
+    aB = xmalloc (dim * sizeof (float));
+    bB = xmalloc (dim * sizeof (float));
+
+    data_a = (uint32_t *) cairo_image_surface_get_data (surface_a);
+    data_b = (uint32_t *) cairo_image_surface_get_data (surface_b);
+    for (y = 0; y < h; y++) {
+	for (x = 0; x < w; x++) {
+	    float r, g, b, l;
+	    i = x + y * w;
+	    r = powf(_get_red (data_a, i) / 255.0f, gamma);
+	    g = powf(_get_green (data_a, i) / 255.0f, gamma);
+	    b = powf(_get_blue (data_a, i) / 255.0f, gamma);
+
+	    AdobeRGBToXYZ(r,g,b,&aX[i],&aY[i],&aZ[i]);
+	    XYZToLAB(aX[i], aY[i], aZ[i], &l, &aA[i], &aB[i]);
+	    r = powf(_get_red (data_b, i) / 255.0f, gamma);
+	    g = powf(_get_green (data_b, i) / 255.0f, gamma);
+	    b = powf(_get_blue (data_b, i) / 255.0f, gamma);
+
+	    AdobeRGBToXYZ(r,g,b,&bX[i],&bY[i],&bZ[i]);
+	    XYZToLAB(bX[i], bY[i], bZ[i], &l, &bA[i], &bB[i]);
+	    aLum[i] = aY[i] * luminance;
+	    bLum[i] = bY[i] * luminance;
+	}
+    }
+
+    la = lpyramid_create (aLum, w, h);
+    lb = lpyramid_create (bLum, w, h);
+
+    num_one_degree_pixels = (float) (2 * tan(field_of_view * 0.5 * M_PI / 180) * 180 / M_PI);
+    pixels_per_degree = w / num_one_degree_pixels;
+
+    num_pixels = 1;
+    adaptation_level = 0;
+    for (i = 0; i < MAX_PYR_LEVELS; i++) {
+	adaptation_level = i;
+	if (num_pixels > num_one_degree_pixels) break;
+	num_pixels *= 2;
+    }
+
+    cpd[0] = 0.5f * pixels_per_degree;
+    for (i = 1; i < MAX_PYR_LEVELS; i++) cpd[i] = 0.5f * cpd[i - 1];
+    csf_max = csf(3.248f, 100.0f);
+
+    for (i = 0; i < MAX_PYR_LEVELS - 2; i++) F_freq[i] = csf_max / csf( cpd[i], 100.0f);
+
+    pixels_failed = 0;
+    for (y = 0; y < h; y++) {
+	for (x = 0; x < w; x++) {
+	    int index = x + y * w;
+	    float contrast[MAX_PYR_LEVELS - 2];
+	    float F_mask[MAX_PYR_LEVELS - 2];
+	    float factor;
+	    float delta;
+	    float adapt;
+	    bool pass;
+	    float sum_contrast = 0;
+	    for (i = 0; i < MAX_PYR_LEVELS - 2; i++) {
+		float n1 = fabsf(lpyramid_get_value (la,x,y,i) - lpyramid_get_value (la,x,y,i + 1));
+		float n2 = fabsf(lpyramid_get_value (lb,x,y,i) - lpyramid_get_value (lb,x,y,i + 1));
+		float numerator = (n1 > n2) ? n1 : n2;
+		float d1 = fabsf(lpyramid_get_value(la,x,y,i+2));
+		float d2 = fabsf(lpyramid_get_value(lb,x,y,i+2));
+		float denominator = (d1 > d2) ? d1 : d2;
+		if (denominator < 1e-5f) denominator = 1e-5f;
+		contrast[i] = numerator / denominator;
+		sum_contrast += contrast[i];
+	    }
+	    if (sum_contrast < 1e-5) sum_contrast = 1e-5f;
+	    adapt = lpyramid_get_value(la,x,y,adaptation_level) + lpyramid_get_value(lb,x,y,adaptation_level);
+	    adapt *= 0.5f;
+	    if (adapt < 1e-5) adapt = 1e-5f;
+	    for (i = 0; i < MAX_PYR_LEVELS - 2; i++) {
+		F_mask[i] = mask(contrast[i] * csf(cpd[i], adapt));
+	    }
+	    factor = 0;
+	    for (i = 0; i < MAX_PYR_LEVELS - 2; i++) {
+		factor += contrast[i] * F_freq[i] * F_mask[i] / sum_contrast;
+	    }
+	    if (factor < 1) factor = 1;
+	    if (factor > 10) factor = 10;
+	    delta = fabsf(lpyramid_get_value(la,x,y,0) - lpyramid_get_value(lb,x,y,0));
+	    pass = true;
+	    /* pure luminance test */
+	    if (delta > factor * tvi(adapt)) {
+		pass = false;
+	    } else {
+		/* CIE delta E test with modifications */
+		float color_scale = 1.0f;
+		float da = aA[index] - bA[index];
+		float db = aB[index] - bB[index];
+		float delta_e;
+		/* ramp down the color test in scotopic regions */
+		if (adapt < 10.0f) {
+		    color_scale = 1.0f - (10.0f - color_scale) / 10.0f;
+		    color_scale = color_scale * color_scale;
+		}
+		da = da * da;
+		db = db * db;
+		delta_e = (da + db) * color_scale;
+		if (delta_e > factor) {
+		    pass = false;
+		}
+	    }
+	    if (!pass)
+		pixels_failed++;
+	}
+    }
+
+    free (aX);
+    free (aY);
+    free (aZ);
+    free (bX);
+    free (bY);
+    free (bZ);
+    free (aLum);
+    free (bLum);
+    lpyramid_destroy (la);
+    lpyramid_destroy (lb);
+    free (aA);
+    free (bA);
+    free (aB);
+    free (bB);
+
+    return pixels_failed;
+}
diff --git a/libs/cairo-1.16.0/test/pdiff/pdiff.h b/libs/cairo-1.16.0/test/pdiff/pdiff.h
new file mode 100644
index 0000000..30fec06
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/pdiff.h
@@ -0,0 +1,40 @@
+/*
+  Copyright (C) 2006 Yangli Hector Yee
+  Copyright (C) 2006 Red Hat, Inc.
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#ifndef _PDIFF_H
+#define _PDIFF_H
+
+#include <cairo.h>
+
+typedef int bool;
+#ifndef true
+#define true 1
+#endif
+#ifndef false
+#define false 0
+#endif
+
+/* Image comparison metric using Yee's method (and a cairo interface)
+ * References: A Perceptual Metric for Production Testing, Hector Yee, Journal of Graphics Tools 2004
+ */
+int
+pdiff_compare (cairo_surface_t *surface_a,
+	       cairo_surface_t *surface_b,
+	       double gamma,
+	       double luminance,
+	       double field_of_view);
+
+#endif
diff --git a/libs/cairo-1.16.0/test/pdiff/perceptualdiff.c b/libs/cairo-1.16.0/test/pdiff/perceptualdiff.c
new file mode 100644
index 0000000..5850dc9
--- /dev/null
+++ b/libs/cairo-1.16.0/test/pdiff/perceptualdiff.c
@@ -0,0 +1,101 @@
+/*
+  PerceptualDiff - a program that compares two images using a perceptual metric
+  based on the paper :
+  A perceptual metric for production testing. Journal of graphics tools, 9(4):33-40, 2004, Hector Yee
+  Copyright (C) 2006 Yangli Hector Yee
+
+  This program is free software; you can redistribute it and/or modify it under the terms of the
+  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with this program;
+  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+#include "lpyramid.h"
+#include "args.h"
+#include "pdiff.h"
+
+static bool Yee_Compare(args_t *args)
+{
+    unsigned int width_a, height_a, stride_a;
+    unsigned char *data_a, *row_a;
+    uint32_t *pixel_a;
+    unsigned int width_b, height_b, stride_b;
+    unsigned char *data_b, *row_b;
+    uint32_t *pixel_b;
+    unsigned int x, y, pixels_failed;
+    bool identical = true;
+
+    width_a = cairo_image_surface_get_width (args->surface_a);
+    height_a = cairo_image_surface_get_height (args->surface_a);
+    stride_a = cairo_image_surface_get_stride (args->surface_a);
+    data_a = cairo_image_surface_get_data (args->surface_a);
+
+    width_b = cairo_image_surface_get_width (args->surface_b);
+    height_b = cairo_image_surface_get_height (args->surface_b);
+    stride_b = cairo_image_surface_get_stride (args->surface_b);
+    data_b = cairo_image_surface_get_data (args->surface_b);
+
+    if ((width_a != width_b) || (height_a != height_b)) {
+	printf ("FAIL: Image dimensions do not match\n");
+	return false;
+    }
+
+    identical = true;
+
+    for (y = 0; y < height_a; y++) {
+	row_a = data_a + y * stride_a;
+	row_b = data_b + y * stride_b;
+	pixel_a = (uint32_t *) row_a;
+	pixel_b = (uint32_t *) row_b;
+	for (x = 0; x < width_a; x++) {
+	    if (*pixel_a != *pixel_b) {
+		identical = false;
+	    }
+	    pixel_a++;
+	    pixel_b++;
+	}
+    }
+    if (identical) {
+	printf ("PASS: Images are binary identical\n");
+	return true;
+    }
+
+    pixels_failed = pdiff_compare (args->surface_a, args->surface_b,
+				   args->Gamma, args->Luminance,
+				   args->FieldOfView);
+
+    if (pixels_failed < args->ThresholdPixels) {
+	printf ("PASS: Images are perceptually indistinguishable\n");
+	return true;
+    }
+
+    printf("FAIL: Images are visibly different\n"
+	   "%d pixels are different\n", pixels_failed);
+
+    return false;
+}
+
+int main(int argc, char **argv)
+{
+    args_t args;
+
+    args_init (&args);
+
+    if (!args_parse (&args, argc, argv)) {
+	return -1;
+    } else {
+	if (args.Verbose)
+	    args_print (&args);
+    }
+    return ! Yee_Compare(&args);
+}