mirror of
https://github.com/webmproject/libwebp.git
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Introduce a test tool anim_diff.
It can be used to test if given pair of animated images (GIF and/or WebP) are identical in terms of pixel match and other animation properties. Change-Id: I84adea145e9d062be6ad06a0d4fcdc9658cf52d4
This commit is contained in:
Urvang Joshi
parent
9e00a499a6
commit
acd7b5af0f
18
README
18
README
@ -371,6 +371,24 @@ or using autoconf:
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$ ./configure --enable-everything
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$ make
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Comparison of animated images:
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==============================
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Test utility anim_diff under examples/ can be used to compare two animated
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images (each can be GIF or WebP).
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Usage:
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anim_diff <image1> <image2> [-dump_frames <folder>] [-min_psnr <float>]
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Building:
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---------
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With the libgif development files and a C++ compiler installed, anim_diff can
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be built using makefile.unix:
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$ make -f makefile.unix examples/anim_diff
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or using autoconf:
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$ ./configure --enable-everything
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$ make
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Encoding API:
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=============
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87
configure.ac
87
configure.ac
@ -11,6 +11,7 @@ m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
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AC_PROG_LIBTOOL
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AM_PROG_CC_C_O
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AC_PROG_CXX
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dnl === Enable less verbose output when building.
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m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
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@ -36,34 +37,42 @@ AC_ARG_WITH([pkgconfigdir], AS_HELP_STRING([--with-pkgconfigdir=DIR],
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[pkgconfigdir="$withval"], [pkgconfigdir='${libdir}/pkgconfig'])
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AC_SUBST([pkgconfigdir])
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dnl === TEST_AND_ADD_CFLAGS(var, flag)
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dnl === Checks whether $CC supports 'flag' and adds it to 'var'
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dnl === on success.
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AC_DEFUN([TEST_AND_ADD_CFLAGS],
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[SAVED_CFLAGS="$CFLAGS"
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CFLAGS="-Werror $2"
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AC_MSG_CHECKING([whether $CC supports $2])
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dnl === TEST_AND_ADD_FLAGS(var, compiler, flag)
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dnl === Checks whether $CC (or $CXX if compiler is 'CXX') supports 'flag' and
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dnl === adds it to 'var' on success.
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AC_DEFUN([TEST_AND_ADD_FLAGS],
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[AS_IF([test "$2" = "CXX"],
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[SAVED_FLAGS="$CXXFLAGS"
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CXXFLAGS="-Werror $3"
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AC_MSG_CHECKING([whether $CXX supports $3])
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AC_LANG_PUSH([C++])],
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[SAVED_FLAGS="$CFLAGS"
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CFLAGS="-Werror $3"
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AC_MSG_CHECKING([whether $CC supports $3])])
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dnl Note AC_LANG_PROGRAM([]) uses an old-style main definition.
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; }])],
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[AC_MSG_RESULT([yes])]
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dnl Simply append the variable avoiding a
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dnl compatibility ifdef for AS_VAR_APPEND as this
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dnl variable shouldn't grow all that large.
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[$1="${$1} $2"],
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[$1="${$1} $3"],
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[AC_MSG_RESULT([no])])
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CFLAGS="$SAVED_CFLAGS"])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wall])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wdeclaration-after-statement])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wextra])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wformat-nonliteral])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wformat-security])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wmissing-declarations])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wmissing-prototypes])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wold-style-definition])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wshadow])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wunused-but-set-variable])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wunused])
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wvla])
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AS_IF([test "$2" = "CXX"],
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[AC_LANG_POP([C++])
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CXXFLAGS="$SAVED_FLAGS"],
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[CFLAGS="$SAVED_FLAGS"])])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wall])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wdeclaration-after-statement])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wextra])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wformat-nonliteral])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wformat-security])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wmissing-declarations])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wmissing-prototypes])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wold-style-definition])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wshadow])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wunused-but-set-variable])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wunused])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-Wvla])
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62040
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# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61622
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AS_IF([test "$GCC" = "yes" ], [
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@ -76,7 +85,7 @@ AS_IF([test "$GCC" = "yes" ], [
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esac
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esac
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AS_IF([test "$gcc_wht_bug" = "yes"], [
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TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-frename-registers])])])
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TEST_AND_ADD_FLAGS([AM_CFLAGS], [C], [-frename-registers])])])
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AC_SUBST([AM_CFLAGS])
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dnl === Check for machine specific flags
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@ -87,7 +96,7 @@ AC_ARG_ENABLE([avx2],
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AS_IF([test "x$enable_avx2" != "xno" -a "x$enable_sse4_1" != "xno" \
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-a "x$enable_sse2" != "xno"], [
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TEST_AND_ADD_CFLAGS([AVX2_FLAGS], [-mavx2])
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TEST_AND_ADD_FLAGS([AVX2_FLAGS], [C], [-mavx2])
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AS_IF([test -n "$AVX2_FLAGS"], [
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SAVED_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $AVX2_FLAGS"
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@ -110,7 +119,7 @@ AC_ARG_ENABLE([sse4.1],
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@<:@default=auto@:>@]))
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AS_IF([test "x$enable_sse4_1" != "xno" -a "x$enable_sse2" != "xno"], [
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TEST_AND_ADD_CFLAGS([SSE41_FLAGS], [-msse4.1])
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TEST_AND_ADD_FLAGS([SSE41_FLAGS], [C], [-msse4.1])
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AS_IF([test -n "$SSE41_FLAGS"], [
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SAVED_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $SSE41_FLAGS"
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@ -127,7 +136,7 @@ AC_ARG_ENABLE([sse2],
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@<:@default=auto@:>@]))
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AS_IF([test "x$enable_sse2" != "xno"], [
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TEST_AND_ADD_CFLAGS([SSE2_FLAGS], [-msse2])
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TEST_AND_ADD_FLAGS([SSE2_FLAGS], [C], [-msse2])
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AS_IF([test -n "$SSE2_FLAGS"], [
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SAVED_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $SSE2_FLAGS"
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@ -436,11 +445,38 @@ AS_IF([test "x$enable_gif" != "xno"], [
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)
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LIBCHECK_EPILOGUE([GIF])
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if test "$gif_support" = "yes" -a \
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"$enable_libwebpdemux" = "yes"; then
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dnl === Enable C++ compiler for .cc sources, if available.
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AC_LANG_PUSH([C++])
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM([#include <iostream>],
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[std::cout << "a";])],
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[cxx_support=yes],
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[AC_MSG_WARN([C++ compiler absent: compilation of C++ sources disabled.])
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cxx_support=no])
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AC_LANG_POP([C++])
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if test "$cxx_support" = "yes"; then
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build_animdiff=yes
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wall])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wextra])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wformat-nonliteral])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wformat-security])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wmissing-declarations])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wshadow])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wunused-but-set-variable])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wunused])
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TEST_AND_ADD_FLAGS([AM_CXXFLAGS], [CXX], [-Wvla])
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AC_SUBST([AM_CXXFLAGS])
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fi
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fi
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if test "$gif_support" = "yes" -a \
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"$enable_libwebpmux" = "yes"; then
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build_gif2webp=yes
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fi
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])
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AM_CONDITIONAL([BUILD_ANIMDIFF], [test "${build_animdiff}" = "yes"])
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AM_CONDITIONAL([BUILD_GIF2WEBP], [test "${build_gif2webp}" = "yes"])
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dnl === check for WIC support ===
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@ -609,6 +645,7 @@ dwebp : yes
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PNG : ${png_support-no}
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WIC : ${wic_support-no}
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GIF support : ${gif_support-no}
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anim_diff : ${build_animdiff-no}
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gif2webp : ${build_gif2webp-no}
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webpmux : ${enable_libwebpmux-no}
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vwebp : ${build_vwebp-no}
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@ -16,6 +16,15 @@ noinst_LTLIBRARIES = libexampleutil.la
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libexampleutil_la_SOURCES = example_util.c example_util.h stopwatch.h
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if BUILD_ANIMDIFF
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noinst_PROGRAMS = anim_diff
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endif
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anim_diff_SOURCES = anim_diff.cc anim_util.cc anim_util.h
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anim_diff_CPPFLAGS = $(AM_CPPFLAGS) $(GIF_INCLUDES)
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anim_diff_LDADD = ../src/demux/libwebpdemux.la
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anim_diff_LDADD += $(GIF_LIBS)
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dwebp_SOURCES = dwebp.c stopwatch.h
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dwebp_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
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dwebp_CPPFLAGS += $(JPEG_INCLUDES) $(PNG_INCLUDES)
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@ -46,9 +55,11 @@ vwebp_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE) $(GL_INCLUDES)
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vwebp_LDADD = libexampleutil.la ../src/demux/libwebpdemux.la $(GL_LIBS)
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if BUILD_LIBWEBPDECODER
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anim_diff_LDADD += ../src/libwebpdecoder.la
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dwebp_LDADD += ../src/libwebpdecoder.la
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vwebp_LDADD += ../src/libwebpdecoder.la
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else
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anim_diff_LDADD += ../src/libwebp.la
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dwebp_LDADD += ../src/libwebp.la
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vwebp_LDADD += ../src/libwebp.la
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endif
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171
examples/anim_diff.cc
Normal file
171
examples/anim_diff.cc
Normal file
@ -0,0 +1,171 @@
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Checks if given pair of animated GIF/WebP images are identical:
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// That is: their reconstructed canvases match pixel-by-pixel and their other
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// animation properties (loop count etc) also match.
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//
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// example: anim_diff foo.gif bar.webp
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#include <stdio.h>
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#include <stdlib.h> // for 'strtod'.
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#include <string.h> // for 'strcmp'.
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#include <iostream> // for 'cout'.
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#include <sstream> // for 'ostringstream'.
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#include "./anim_util.h"
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namespace {
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template<typename T>
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bool CompareValues(T a, T b, const std::string& output_str) {
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if (a != b) {
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std::cout << output_str << ": " << a << " vs " << b << std::endl;
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return false;
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}
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return true;
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}
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// Note: As long as frame durations and reconstructed frames are identical, it
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// is OK for other aspects like offsets, dispose/blend method to vary.
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bool CompareAnimatedImagePair(const AnimatedImage& img1,
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const AnimatedImage& img2,
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double min_psnr) {
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bool ok = true;
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ok = CompareValues(img1.canvas_width, img2.canvas_width,
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"Canvas width mismatch") && ok;
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ok = CompareValues(img1.canvas_height, img2.canvas_height,
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"Canvas height mismatch") && ok;
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ok = CompareValues(img1.frames.size(), img2.frames.size(),
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"Frame count mismatch") && ok;
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if (!ok) return false; // These are fatal failures, can't proceed.
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const bool is_multi_frame_image = (img1.frames.size() > 1);
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if (is_multi_frame_image) { // Checks relevant for multi-frame images only.
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ok = CompareValues(img1.loop_count, img2.loop_count,
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"Loop count mismatch") && ok;
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ok = CompareValues(img1.bgcolor, img2.bgcolor,
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"Background color mismatch") && ok;
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}
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for (size_t i = 0; i < img1.frames.size(); ++i) {
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if (is_multi_frame_image) { // Check relevant for multi-frame images only.
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std::ostringstream error_str;
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error_str << "Frame #" << i << ", duration mismatch";
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ok = CompareValues(img1.frames[i].duration, img2.frames[i].duration,
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error_str.str()) && ok;
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}
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// Pixel-by-pixel comparison.
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const uint8_t* rgba1 = img1.frames[i].rgba.data();
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const uint8_t* rgba2 = img2.frames[i].rgba.data();
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int max_diff;
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double psnr;
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GetDiffAndPSNR(rgba1, rgba2, img1.canvas_width, img1.canvas_height,
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&max_diff, &psnr);
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if (min_psnr > 0.) {
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if (psnr < min_psnr) {
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fprintf(stderr, "Frame #%zu, psnr = %.2lf (min_psnr = %f)\n", i,
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psnr, min_psnr);
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ok = false;
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}
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} else {
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if (max_diff != 0) {
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fprintf(stderr, "Frame #%zu, max pixel diff: %d\n", i, max_diff);
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ok = false;
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}
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}
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}
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return ok;
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}
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void Help() {
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printf("\nUsage: anim_diff <image1> <image2> [-dump_frames <folder>] "
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"[-min_psnr <float>]\n");
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}
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} // namespace
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int main(int argc, const char* argv[]) {
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bool dump_frames = false;
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const char* dump_folder = NULL;
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double min_psnr = 0.;
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bool got_input1 = false;
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bool got_input2 = false;
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const char* files[2];
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if (argc < 3) {
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Help();
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return -1;
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}
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for (int c = 1; c < argc; ++c) {
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bool parse_error = false;
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if (!strcmp(argv[c], "-dump_frames")) {
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if (c < argc - 1) {
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dump_frames = true;
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dump_folder = argv[++c];
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} else {
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parse_error = true;
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}
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} else if (!strcmp(argv[c], "-min_psnr")) {
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if (c < argc - 1) {
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const char* const v = argv[++c];
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char* end = NULL;
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const double d = strtod(v, &end);
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if (end == v) {
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parse_error = true;
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fprintf(stderr, "Error! '%s' is not a floating point number.\n", v);
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}
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min_psnr = d;
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} else {
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parse_error = true;
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}
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} else {
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if (!got_input1) {
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files[0] = argv[c];
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got_input1 = true;
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} else if (!got_input2) {
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files[1] = argv[c];
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got_input2 = true;
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} else {
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parse_error = true;
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}
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}
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if (parse_error) {
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Help();
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return -1;
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}
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}
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if (!got_input2) {
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Help();
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return -1;
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}
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if (dump_frames) {
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printf("Dumping decoded frames in: %s\n", dump_folder);
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}
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AnimatedImage images[2];
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for (int i = 0; i < 2; ++i) {
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printf("Decoding file: %s\n", files[i]);
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if (!ReadAnimatedImage(files[i], &images[i], dump_frames, dump_folder)) {
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fprintf(stderr, "Error decoding file: %s\n Aborting.\n", files[i]);
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return -2;
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}
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}
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if (!CompareAnimatedImagePair(images[0], images[1], min_psnr)) {
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fprintf(stderr, "\nFiles %s and %s differ.\n", files[0], files[1]);
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return -3;
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}
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printf("\nFiles %s and %s are identical.\n", files[0], files[1]);
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return 0;
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}
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838
examples/anim_util.cc
Normal file
838
examples/anim_util.cc
Normal file
@ -0,0 +1,838 @@
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
|
||||
// that can be found in the COPYING file in the root of the source
|
||||
// tree. An additional intellectual property rights grant can be found
|
||||
// in the file PATENTS. All contributing project authors may
|
||||
// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Utilities for animated images
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#include "./anim_util.h"
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#include <assert.h>
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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||||
|
||||
#include <fstream>
|
||||
#include <sstream> // for 'ostringstream'.
|
||||
|
||||
#ifdef WEBP_HAVE_GIF
|
||||
#include <gif_lib.h>
|
||||
#endif
|
||||
#include "webp/format_constants.h"
|
||||
#include "webp/decode.h"
|
||||
#include "webp/demux.h"
|
||||
|
||||
using std::ifstream;
|
||||
using std::ios;
|
||||
using std::ofstream;
|
||||
using std::ostringstream;
|
||||
|
||||
static const int kNumChannels = 4;
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// Common utilities.
|
||||
|
||||
// Returns true if the frame covers the full canvas.
|
||||
static bool IsFullFrame(int width, int height,
|
||||
int canvas_width, int canvas_height) {
|
||||
return (width == canvas_width && height == canvas_height);
|
||||
}
|
||||
|
||||
static void AllocateFrames(AnimatedImage* const image, uint32_t frame_count) {
|
||||
image->frames.resize(frame_count);
|
||||
for (size_t i = 0; i < image->frames.size(); ++i) {
|
||||
const size_t rgba_size =
|
||||
image->canvas_width * kNumChannels * image->canvas_height;
|
||||
image->frames[i].rgba.resize(rgba_size);
|
||||
}
|
||||
}
|
||||
|
||||
// Clear the canvas to transparent.
|
||||
static void ZeroFillCanvas(uint8_t* rgba,
|
||||
uint32_t canvas_width, uint32_t canvas_height) {
|
||||
memset(rgba, 0, canvas_width * kNumChannels * canvas_height);
|
||||
}
|
||||
|
||||
// Clear given frame rectangle to transparent.
|
||||
static void ZeroFillFrameRect(uint8_t* rgba, int rgba_stride, int x_offset,
|
||||
int y_offset, int width, int height) {
|
||||
assert(width * kNumChannels <= rgba_stride);
|
||||
rgba += y_offset * rgba_stride + x_offset * kNumChannels;
|
||||
for (int j = 0; j < height; ++j) {
|
||||
memset(rgba, 0, width * kNumChannels);
|
||||
rgba += rgba_stride;
|
||||
}
|
||||
}
|
||||
|
||||
// Copy width * height pixels from 'src' to 'dst'.
|
||||
static void CopyCanvas(const uint8_t* src, uint8_t* dst,
|
||||
uint32_t width, uint32_t height) {
|
||||
assert(src != NULL && dst != NULL);
|
||||
memcpy(dst, src, width * kNumChannels * height);
|
||||
}
|
||||
|
||||
// Copy pixels in the given rectangle from 'src' to 'dst' honoring the 'stride'.
|
||||
static void CopyFrameRectangle(const uint8_t* src, uint8_t* dst, int stride,
|
||||
int x_offset, int y_offset,
|
||||
int width, int height) {
|
||||
const int width_in_bytes = width * kNumChannels;
|
||||
assert(width_in_bytes <= stride);
|
||||
const size_t offset = y_offset * stride + x_offset * kNumChannels;
|
||||
src += offset;
|
||||
dst += offset;
|
||||
for (int j = 0; j < height; ++j) {
|
||||
memcpy(dst, src, width_in_bytes);
|
||||
src += stride;
|
||||
dst += stride;
|
||||
}
|
||||
}
|
||||
|
||||
// Canonicalize all transparent pixels to transparent black to aid comparison.
|
||||
static void CleanupTransparentPixels(uint32_t* rgba,
|
||||
uint32_t width, uint32_t height) {
|
||||
const uint32_t* const rgba_end = rgba + width * height;
|
||||
while (rgba < rgba_end) {
|
||||
const uint8_t alpha = (*rgba >> 24) & 0xff;
|
||||
if (alpha == 0) {
|
||||
*rgba = 0;
|
||||
}
|
||||
++rgba;
|
||||
}
|
||||
}
|
||||
|
||||
// Dump frame to a PAM file.
|
||||
// Returns true on success.
|
||||
static bool DumpFrame(const char filename[], const char dump_folder[],
|
||||
uint32_t frame_num, const uint8_t rgba[],
|
||||
int canvas_width, int canvas_height) {
|
||||
const std::string filename_str = filename;
|
||||
const size_t slash_idx = filename_str.find_last_of("/\\");
|
||||
const std::string base_name = (slash_idx != std::string::npos)
|
||||
? filename_str.substr(slash_idx + 1)
|
||||
: filename_str;
|
||||
ostringstream dump_file;
|
||||
dump_file << dump_folder << "/" << base_name << "_frame_" << frame_num
|
||||
<< ".pam";
|
||||
|
||||
ofstream fout(dump_file.str().c_str(), ios::binary | ios::out);
|
||||
if (!fout.good()) {
|
||||
fprintf(stderr, "Error opening file for writing: %s\n",
|
||||
dump_file.str().c_str());
|
||||
return false;
|
||||
}
|
||||
|
||||
fout << "P7\nWIDTH " << canvas_width << "\nHEIGHT " << canvas_height
|
||||
<< "\nDEPTH 4\nMAXVAL 255\nTUPLTYPE RGB_ALPHA\nENDHDR\n";
|
||||
for (int y = 0; y < canvas_height; ++y) {
|
||||
fout.write(
|
||||
reinterpret_cast<const char*>(rgba) + y * canvas_width * kNumChannels,
|
||||
canvas_width * kNumChannels);
|
||||
if (!fout.good()) {
|
||||
fprintf(stderr, "Error writing to file: %s\n", dump_file.str().c_str());
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
fout.close();
|
||||
return true;
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// WebP Decoding.
|
||||
|
||||
// Returns true if this is a valid WebP bitstream.
|
||||
static bool IsWebP(const std::string& file_str) {
|
||||
return WebPGetInfo(reinterpret_cast<const uint8_t*>(file_str.c_str()),
|
||||
file_str.length(), NULL, NULL) != 0;
|
||||
}
|
||||
|
||||
// Returns true if the current frame is a key-frame.
|
||||
static bool IsKeyFrameWebP(const WebPIterator& curr, const WebPIterator& prev,
|
||||
const DecodedFrame* const prev_frame,
|
||||
int canvas_width, int canvas_height) {
|
||||
if (prev_frame == NULL) {
|
||||
return true;
|
||||
} else if ((!curr.has_alpha || curr.blend_method == WEBP_MUX_NO_BLEND) &&
|
||||
IsFullFrame(curr.width, curr.height,
|
||||
canvas_width, canvas_height)) {
|
||||
return true;
|
||||
} else {
|
||||
return (prev.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) &&
|
||||
(IsFullFrame(prev.width, prev.height, canvas_width, canvas_height) ||
|
||||
prev_frame->is_key_frame);
|
||||
}
|
||||
}
|
||||
|
||||
// Blend a single channel of 'src' over 'dst', given their alpha channel values.
|
||||
static uint8_t BlendChannelWebP(uint32_t src, uint8_t src_a, uint32_t dst,
|
||||
uint8_t dst_a, uint32_t scale, int shift) {
|
||||
const uint8_t src_channel = (src >> shift) & 0xff;
|
||||
const uint8_t dst_channel = (dst >> shift) & 0xff;
|
||||
const uint32_t blend_unscaled = src_channel * src_a + dst_channel * dst_a;
|
||||
assert(blend_unscaled < (1ULL << 32) / scale);
|
||||
return (blend_unscaled * scale) >> 24;
|
||||
}
|
||||
|
||||
// Blend 'src' over 'dst' assuming they are NOT pre-multiplied by alpha.
|
||||
static uint32_t BlendPixelWebP(uint32_t src, uint32_t dst) {
|
||||
const uint8_t src_a = (src >> 24) & 0xff;
|
||||
|
||||
if (src_a == 0) {
|
||||
return dst;
|
||||
} else {
|
||||
const uint8_t dst_a = (dst >> 24) & 0xff;
|
||||
// This is the approximate integer arithmetic for the actual formula:
|
||||
// dst_factor_a = (dst_a * (255 - src_a)) / 255.
|
||||
const uint8_t dst_factor_a = (dst_a * (256 - src_a)) >> 8;
|
||||
assert(src_a + dst_factor_a < 256);
|
||||
const uint8_t blend_a = src_a + dst_factor_a;
|
||||
const uint32_t scale = (1UL << 24) / blend_a;
|
||||
|
||||
const uint8_t blend_r =
|
||||
BlendChannelWebP(src, src_a, dst, dst_factor_a, scale, 0);
|
||||
const uint8_t blend_g =
|
||||
BlendChannelWebP(src, src_a, dst, dst_factor_a, scale, 8);
|
||||
const uint8_t blend_b =
|
||||
BlendChannelWebP(src, src_a, dst, dst_factor_a, scale, 16);
|
||||
|
||||
return (blend_r << 0) | (blend_g << 8) | (blend_b << 16) | (blend_a << 24);
|
||||
}
|
||||
}
|
||||
|
||||
// Returns two ranges (<left, width> pairs) at row 'canvas_y', that belong to
|
||||
// 'src' but not 'dst'. A point range is empty if the corresponding width is 0.
|
||||
static void FindBlendRangeAtRowWebP(const WebPIterator* const src,
|
||||
const WebPIterator* const dst, int canvas_y,
|
||||
int* const left1, int* const width1,
|
||||
int* const left2, int* const width2) {
|
||||
const int src_max_x = src->x_offset + src->width;
|
||||
const int dst_max_x = dst->x_offset + dst->width;
|
||||
const int dst_max_y = dst->y_offset + dst->height;
|
||||
assert(canvas_y >= src->y_offset && canvas_y < (src->y_offset + src->height));
|
||||
*left1 = -1;
|
||||
*width1 = 0;
|
||||
*left2 = -1;
|
||||
*width2 = 0;
|
||||
|
||||
if (canvas_y < dst->y_offset || canvas_y >= dst_max_y ||
|
||||
src->x_offset >= dst_max_x || src_max_x <= dst->x_offset) {
|
||||
*left1 = src->x_offset;
|
||||
*width1 = src->width;
|
||||
return;
|
||||
}
|
||||
|
||||
if (src->x_offset < dst->x_offset) {
|
||||
*left1 = src->x_offset;
|
||||
*width1 = dst->x_offset - src->x_offset;
|
||||
}
|
||||
|
||||
if (src_max_x > dst_max_x) {
|
||||
*left2 = dst_max_x;
|
||||
*width2 = src_max_x - dst_max_x;
|
||||
}
|
||||
}
|
||||
|
||||
// Blend 'num_pixels' in 'src' over 'dst'.
|
||||
static void BlendPixelRowWebP(uint32_t* const src, const uint32_t* const dst,
|
||||
int num_pixels) {
|
||||
for (int i = 0; i < num_pixels; ++i) {
|
||||
uint32_t* const src_pixel_ptr = &src[i];
|
||||
const uint8_t src_alpha = (*src_pixel_ptr >> 24) & 0xff;
|
||||
if (src_alpha != 0xff) {
|
||||
const uint32_t dst_pixel = dst[i];
|
||||
*src_pixel_ptr = BlendPixelWebP(*src_pixel_ptr, dst_pixel);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Read animated WebP bitstream 'file_str' into 'AnimatedImage' struct.
|
||||
static bool ReadAnimatedWebP(const char filename[], const std::string& file_str,
|
||||
AnimatedImage* const image, bool dump_frames,
|
||||
const char dump_folder[]) {
|
||||
bool ok = true;
|
||||
const WebPData webp_data = {
|
||||
reinterpret_cast<const uint8_t*>(file_str.data()), file_str.size()
|
||||
};
|
||||
WebPDemuxer* const demux = WebPDemux(&webp_data);
|
||||
if (demux == NULL) return false;
|
||||
|
||||
// Animation properties.
|
||||
image->canvas_width = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
|
||||
image->canvas_height = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
|
||||
image->loop_count = WebPDemuxGetI(demux, WEBP_FF_LOOP_COUNT);
|
||||
image->bgcolor = WebPDemuxGetI(demux, WEBP_FF_BACKGROUND_COLOR);
|
||||
|
||||
const uint32_t frame_count = WebPDemuxGetI(demux, WEBP_FF_FRAME_COUNT);
|
||||
const uint32_t canvas_width = image->canvas_width;
|
||||
const uint32_t canvas_height = image->canvas_height;
|
||||
|
||||
// Allocate frames.
|
||||
AllocateFrames(image, frame_count);
|
||||
|
||||
// Decode and reconstruct frames.
|
||||
WebPIterator prev_iter = WebPIterator();
|
||||
WebPIterator curr_iter = WebPIterator();
|
||||
|
||||
for (uint32_t i = 0; i < frame_count; ++i) {
|
||||
prev_iter = curr_iter;
|
||||
|
||||
// Get frame.
|
||||
if (!WebPDemuxGetFrame(demux, i + 1, &curr_iter)) {
|
||||
fprintf(stderr, "Error retrieving frame #%u\n", i);
|
||||
return false;
|
||||
}
|
||||
|
||||
DecodedFrame* const prev_frame = (i > 0) ? &image->frames[i - 1] : NULL;
|
||||
uint8_t* const prev_rgba =
|
||||
(prev_frame != NULL) ? prev_frame->rgba.data() : NULL;
|
||||
DecodedFrame* const curr_frame = &image->frames[i];
|
||||
uint8_t* const curr_rgba = curr_frame->rgba.data();
|
||||
|
||||
curr_frame->duration = curr_iter.duration;
|
||||
curr_frame->is_key_frame = IsKeyFrameWebP(curr_iter, prev_iter, prev_frame,
|
||||
canvas_width, canvas_height);
|
||||
|
||||
// TODO(urvang): The logic of decoding and reconstructing the next animated
|
||||
// frame given the previous one should be a single library call (ideally a
|
||||
// user-facing API), which takes care of frame disposal, blending etc.
|
||||
|
||||
// Initialize.
|
||||
if (curr_frame->is_key_frame) {
|
||||
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
|
||||
} else {
|
||||
CopyCanvas(prev_rgba, curr_rgba, canvas_width, canvas_height);
|
||||
if (prev_iter.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
|
||||
ZeroFillFrameRect(curr_rgba, canvas_width * kNumChannels,
|
||||
prev_iter.x_offset, prev_iter.y_offset,
|
||||
prev_iter.width, prev_iter.height);
|
||||
}
|
||||
}
|
||||
|
||||
// Decode.
|
||||
const uint8_t* input = curr_iter.fragment.bytes;
|
||||
const size_t input_size = curr_iter.fragment.size;
|
||||
const size_t output_offset =
|
||||
(curr_iter.y_offset * canvas_width + curr_iter.x_offset) * kNumChannels;
|
||||
uint8_t* output = curr_rgba + output_offset;
|
||||
const int output_stride = kNumChannels * canvas_width;
|
||||
const size_t output_size = output_stride * curr_iter.height;
|
||||
|
||||
if (WebPDecodeRGBAInto(input, input_size, output, output_size,
|
||||
output_stride) == NULL) {
|
||||
ok = false;
|
||||
break;
|
||||
}
|
||||
|
||||
// During the decoding of current frame, we may have set some pixels to be
|
||||
// transparent (i.e. alpha < 255). However, the value of each of these
|
||||
// pixels should have been determined by blending it against the value of
|
||||
// that pixel in the previous frame if blending method of is WEBP_MUX_BLEND.
|
||||
if (i > 0 && curr_iter.blend_method == WEBP_MUX_BLEND &&
|
||||
!curr_frame->is_key_frame) {
|
||||
if (prev_iter.dispose_method == WEBP_MUX_DISPOSE_NONE) {
|
||||
// Blend transparent pixels with pixels in previous canvas.
|
||||
for (int y = 0; y < curr_iter.height; ++y) {
|
||||
const size_t offset =
|
||||
(curr_iter.y_offset + y) * canvas_width + curr_iter.x_offset;
|
||||
BlendPixelRowWebP(reinterpret_cast<uint32_t*>(curr_rgba) + offset,
|
||||
reinterpret_cast<uint32_t*>(prev_rgba) + offset,
|
||||
curr_iter.width);
|
||||
}
|
||||
} else {
|
||||
assert(prev_iter.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND);
|
||||
// We need to blend a transparent pixel with its value just after
|
||||
// initialization. That is, blend it with:
|
||||
// * Fully transparent pixel if it belongs to prevRect <-- No-op.
|
||||
// * The pixel in the previous canvas otherwise <-- Need alpha-blending.
|
||||
for (int y = 0; y < curr_iter.height; ++y) {
|
||||
const int canvas_y = curr_iter.y_offset + y;
|
||||
int left1, width1, left2, width2;
|
||||
FindBlendRangeAtRowWebP(&curr_iter, &prev_iter, canvas_y, &left1,
|
||||
&width1, &left2, &width2);
|
||||
if (width1 > 0) {
|
||||
const size_t offset1 = canvas_y * canvas_width + left1;
|
||||
BlendPixelRowWebP(reinterpret_cast<uint32_t*>(curr_rgba) + offset1,
|
||||
reinterpret_cast<uint32_t*>(prev_rgba) + offset1,
|
||||
width1);
|
||||
}
|
||||
if (width2 > 0) {
|
||||
const size_t offset2 = canvas_y * canvas_width + left2;
|
||||
BlendPixelRowWebP(reinterpret_cast<uint32_t*>(curr_rgba) + offset2,
|
||||
reinterpret_cast<uint32_t*>(prev_rgba) + offset2,
|
||||
width2);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Needed only because we may want to compare with GIF later.
|
||||
CleanupTransparentPixels(reinterpret_cast<uint32_t*>(curr_rgba),
|
||||
canvas_width, canvas_height);
|
||||
|
||||
if (dump_frames) {
|
||||
ok = ok && DumpFrame(filename, dump_folder, i, curr_rgba,
|
||||
canvas_width, canvas_height);
|
||||
}
|
||||
}
|
||||
WebPDemuxReleaseIterator(&prev_iter);
|
||||
WebPDemuxReleaseIterator(&curr_iter);
|
||||
WebPDemuxDelete(demux);
|
||||
return ok;
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
// GIF Decoding.
|
||||
|
||||
// Returns true if this is a valid GIF bitstream.
|
||||
static bool IsGIF(const std::string& file_str) {
|
||||
const char* const cstr = file_str.c_str();
|
||||
return file_str.length() > GIF_STAMP_LEN &&
|
||||
(!memcmp(GIF_STAMP, cstr, GIF_STAMP_LEN) ||
|
||||
!memcmp(GIF87_STAMP, cstr, GIF_STAMP_LEN) ||
|
||||
!memcmp(GIF89_STAMP, cstr, GIF_STAMP_LEN));
|
||||
}
|
||||
|
||||
#ifdef WEBP_HAVE_GIF
|
||||
|
||||
// GIFLIB_MAJOR is only defined in libgif >= 4.2.0.
|
||||
#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR)
|
||||
# define LOCAL_GIF_VERSION ((GIFLIB_MAJOR << 8) | GIFLIB_MINOR)
|
||||
# define LOCAL_GIF_PREREQ(maj, min) \
|
||||
(LOCAL_GIF_VERSION >= (((maj) << 8) | (min)))
|
||||
#else
|
||||
# define LOCAL_GIF_VERSION 0
|
||||
# define LOCAL_GIF_PREREQ(maj, min) 0
|
||||
#endif
|
||||
|
||||
#if !LOCAL_GIF_PREREQ(5, 0)
|
||||
|
||||
// Added in v5.0
|
||||
typedef struct GraphicsControlBlock {
|
||||
int DisposalMode;
|
||||
#define DISPOSAL_UNSPECIFIED 0 // No disposal specified
|
||||
#define DISPOSE_DO_NOT 1 // Leave image in place
|
||||
#define DISPOSE_BACKGROUND 2 // Set area to background color
|
||||
#define DISPOSE_PREVIOUS 3 // Restore to previous content
|
||||
bool UserInputFlag; // User confirmation required before disposal
|
||||
int DelayTime; // Pre-display delay in 0.01sec units
|
||||
int TransparentColor; // Palette index for transparency, -1 if none
|
||||
#define NO_TRANSPARENT_COLOR -1
|
||||
} GraphicsControlBlock;
|
||||
|
||||
static int DGifExtensionToGCB(const size_t GifExtensionLength,
|
||||
const GifByteType* GifExtension,
|
||||
GraphicsControlBlock* gcb) {
|
||||
if (GifExtensionLength != 4) {
|
||||
return GIF_ERROR;
|
||||
}
|
||||
gcb->DisposalMode = (GifExtension[0] >> 2) & 0x07;
|
||||
gcb->UserInputFlag = (GifExtension[0] & 0x02) != 0;
|
||||
gcb->DelayTime = GifExtension[1] | (GifExtension[2] << 8);
|
||||
if (GifExtension[0] & 0x01) {
|
||||
gcb->TransparentColor = static_cast<int>(GifExtension[3]);
|
||||
} else {
|
||||
gcb->TransparentColor = NO_TRANSPARENT_COLOR;
|
||||
}
|
||||
return GIF_OK;
|
||||
}
|
||||
|
||||
static int DGifSavedExtensionToGCB(GifFileType* GifFile, int ImageIndex,
|
||||
GraphicsControlBlock* gcb) {
|
||||
int i;
|
||||
if (ImageIndex < 0 || ImageIndex > GifFile->ImageCount - 1) {
|
||||
return GIF_ERROR;
|
||||
}
|
||||
gcb->DisposalMode = DISPOSAL_UNSPECIFIED;
|
||||
gcb->UserInputFlag = false;
|
||||
gcb->DelayTime = 0;
|
||||
gcb->TransparentColor = NO_TRANSPARENT_COLOR;
|
||||
|
||||
for (i = 0; i < GifFile->SavedImages[ImageIndex].ExtensionBlockCount; i++) {
|
||||
ExtensionBlock* ep = &GifFile->SavedImages[ImageIndex].ExtensionBlocks[i];
|
||||
if (ep->Function == GRAPHICS_EXT_FUNC_CODE) {
|
||||
return DGifExtensionToGCB(
|
||||
ep->ByteCount, reinterpret_cast<const GifByteType*>(ep->Bytes), gcb);
|
||||
}
|
||||
}
|
||||
return GIF_ERROR;
|
||||
}
|
||||
|
||||
#define CONTINUE_EXT_FUNC_CODE 0x00
|
||||
|
||||
// Signature was changed in v5.0
|
||||
#define DGifOpenFileName(a, b) DGifOpenFileName(a)
|
||||
|
||||
#endif // !LOCAL_GIF_PREREQ(5, 0)
|
||||
|
||||
// Signature changed in v5.1
|
||||
#if !LOCAL_GIF_PREREQ(5, 1)
|
||||
#define DGifCloseFile(a, b) DGifCloseFile(a)
|
||||
#endif
|
||||
|
||||
static void GIFDisplayError(const GifFileType* const gif, int gif_error) {
|
||||
// libgif 4.2.0 has retired PrintGifError() and added GifErrorString().
|
||||
#if LOCAL_GIF_PREREQ(4, 2)
|
||||
#if LOCAL_GIF_PREREQ(5, 0)
|
||||
// Static string actually, hence the const char* cast.
|
||||
const char* error_str = (const char*)GifErrorString(
|
||||
(gif == NULL) ? gif_error : gif->Error);
|
||||
#else
|
||||
const char* error_str = (const char*)GifErrorString();
|
||||
(void)gif;
|
||||
#endif
|
||||
if (error_str == NULL) error_str = "Unknown error";
|
||||
fprintf(stderr, "GIFLib Error %d: %s\n", gif_error, error_str);
|
||||
#else
|
||||
(void)gif;
|
||||
fprintf(stderr, "GIFLib Error %d: ", gif_error);
|
||||
PrintGifError();
|
||||
fprintf(stderr, "\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
static bool IsKeyFrameGIF(const GifImageDesc& prev_desc, int prev_dispose,
|
||||
const DecodedFrame* const prev_frame,
|
||||
int canvas_width, int canvas_height) {
|
||||
if (prev_frame == NULL) return true;
|
||||
if (prev_dispose == DISPOSE_BACKGROUND) {
|
||||
if (IsFullFrame(prev_desc.Width, prev_desc.Height,
|
||||
canvas_width, canvas_height)) {
|
||||
return true;
|
||||
}
|
||||
if (prev_frame->is_key_frame) return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
static int GetTransparentIndexGIF(GifFileType* gif) {
|
||||
GraphicsControlBlock first_gcb = GraphicsControlBlock();
|
||||
DGifSavedExtensionToGCB(gif, 0, &first_gcb);
|
||||
return first_gcb.TransparentColor;
|
||||
}
|
||||
|
||||
static uint32_t GetBackgroundColorGIF(GifFileType* gif) {
|
||||
const int transparent_index = GetTransparentIndexGIF(gif);
|
||||
const ColorMapObject* const color_map = gif->SColorMap;
|
||||
if (transparent_index != NO_TRANSPARENT_COLOR &&
|
||||
gif->SBackGroundColor == transparent_index) {
|
||||
return 0x00ffffff; // Special case: transparent white.
|
||||
} else if (color_map == NULL || color_map->Colors == NULL
|
||||
|| gif->SBackGroundColor >= color_map->ColorCount) {
|
||||
return 0xffffffff; // Invalid: assume white.
|
||||
} else {
|
||||
const GifColorType color = color_map->Colors[gif->SBackGroundColor];
|
||||
return (0xff << 24) |
|
||||
(color.Red << 16) |
|
||||
(color.Green << 8) |
|
||||
(color.Blue << 0);
|
||||
}
|
||||
}
|
||||
|
||||
// Find appropriate app extension and get loop count from the next extension.
|
||||
static uint32_t GetLoopCountGIF(const GifFileType* const gif) {
|
||||
for (int i = 0; i < gif->ImageCount; ++i) {
|
||||
const SavedImage* const image = &gif->SavedImages[i];
|
||||
for (int j = 0; (j + 1) < image->ExtensionBlockCount; ++j) {
|
||||
const ExtensionBlock* const eb1 = image->ExtensionBlocks + j;
|
||||
const ExtensionBlock* const eb2 = image->ExtensionBlocks + j + 1;
|
||||
const char* const signature = reinterpret_cast<const char*>(eb1->Bytes);
|
||||
const bool signature_is_ok =
|
||||
(eb1->Function == APPLICATION_EXT_FUNC_CODE) &&
|
||||
(eb1->ByteCount == 11) &&
|
||||
(!memcmp(signature, "NETSCAPE2.0", 11) ||
|
||||
!memcmp(signature, "ANIMEXTS1.0", 11));
|
||||
if (signature_is_ok &&
|
||||
eb2->Function == CONTINUE_EXT_FUNC_CODE && eb2->ByteCount >= 3 &&
|
||||
eb2->Bytes[0] == 1) {
|
||||
return (static_cast<uint32_t>(eb2->Bytes[2]) << 8) +
|
||||
(static_cast<uint32_t>(eb2->Bytes[1]) << 0);
|
||||
}
|
||||
}
|
||||
}
|
||||
return 0; // Default.
|
||||
}
|
||||
|
||||
// Get duration of 'n'th frame in milliseconds.
|
||||
static int GetFrameDurationGIF(GifFileType* gif, int n) {
|
||||
GraphicsControlBlock gcb = GraphicsControlBlock();
|
||||
DGifSavedExtensionToGCB(gif, n, &gcb);
|
||||
return gcb.DelayTime * 10;
|
||||
}
|
||||
|
||||
// Returns true if frame 'target' completely covers 'covered'.
|
||||
static bool CoversFrameGIF(const GifImageDesc& target,
|
||||
const GifImageDesc& covered) {
|
||||
return target.Left <= covered.Left &&
|
||||
covered.Left + covered.Width <= target.Left + target.Width &&
|
||||
target.Top <= covered.Top &&
|
||||
covered.Top + covered.Height <= target.Top + target.Height;
|
||||
}
|
||||
|
||||
static void RemapPixelsGIF(const uint8_t* const src,
|
||||
const ColorMapObject* const cmap,
|
||||
int transparent_color, int len, uint8_t* dst) {
|
||||
int i;
|
||||
for (i = 0; i < len; ++i) {
|
||||
if (src[i] != transparent_color) {
|
||||
// If a pixel in the current frame is transparent, we don't modify it, so
|
||||
// that we can see-through the corresponding pixel from an earlier frame.
|
||||
const GifColorType c = cmap->Colors[src[i]];
|
||||
dst[4 * i + 0] = c.Red;
|
||||
dst[4 * i + 1] = c.Green;
|
||||
dst[4 * i + 2] = c.Blue;
|
||||
dst[4 * i + 3] = 0xff;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static bool ReadFrameGIF(const SavedImage* const gif_image,
|
||||
const ColorMapObject* cmap, int transparent_color,
|
||||
int out_stride, uint8_t* const dst) {
|
||||
const GifImageDesc& image_desc = gif_image->ImageDesc;
|
||||
if (image_desc.ColorMap) {
|
||||
cmap = image_desc.ColorMap;
|
||||
}
|
||||
|
||||
if (cmap == NULL || cmap->ColorCount != (1 << cmap->BitsPerPixel)) {
|
||||
fprintf(stderr, "Potentially corrupt color map.\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
const uint8_t* in = reinterpret_cast<uint8_t*>(gif_image->RasterBits);
|
||||
uint8_t* out =
|
||||
dst + image_desc.Top * out_stride + image_desc.Left * kNumChannels;
|
||||
|
||||
for (int j = 0; j < image_desc.Height; ++j) {
|
||||
RemapPixelsGIF(in, cmap, transparent_color, image_desc.Width, out);
|
||||
in += image_desc.Width;
|
||||
out += out_stride;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
// Read animated GIF bitstream from 'filename' into 'AnimatedImage' struct.
|
||||
static bool ReadAnimatedGIF(const char filename[], AnimatedImage* const image,
|
||||
bool dump_frames, const char dump_folder[]) {
|
||||
GifFileType* gif = DGifOpenFileName(filename, NULL);
|
||||
if (gif == NULL) {
|
||||
fprintf(stderr, "Could not read file: %s.\n", filename);
|
||||
return false;
|
||||
}
|
||||
|
||||
const int gif_error = DGifSlurp(gif);
|
||||
if (gif_error != GIF_OK) {
|
||||
fprintf(stderr, "Could not parse image: %s.\n", filename);
|
||||
GIFDisplayError(gif, gif_error);
|
||||
DGifCloseFile(gif, NULL);
|
||||
return false;
|
||||
}
|
||||
|
||||
// Animation properties.
|
||||
image->canvas_width = static_cast<uint32_t>(gif->SWidth);
|
||||
image->canvas_height = static_cast<uint32_t>(gif->SHeight);
|
||||
if (image->canvas_width > MAX_CANVAS_SIZE ||
|
||||
image->canvas_height > MAX_CANVAS_SIZE) {
|
||||
fprintf(stderr, "Invalid canvas dimension: %d x %d\n",
|
||||
image->canvas_width, image->canvas_height);
|
||||
DGifCloseFile(gif, NULL);
|
||||
return false;
|
||||
}
|
||||
image->loop_count = GetLoopCountGIF(gif);
|
||||
image->bgcolor = GetBackgroundColorGIF(gif);
|
||||
|
||||
const uint32_t frame_count = static_cast<uint32_t>(gif->ImageCount);
|
||||
if (frame_count == 0) {
|
||||
DGifCloseFile(gif, NULL);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (image->canvas_width == 0 || image->canvas_height == 0) {
|
||||
image->canvas_width = gif->SavedImages[0].ImageDesc.Width;
|
||||
image->canvas_height = gif->SavedImages[0].ImageDesc.Height;
|
||||
gif->SavedImages[0].ImageDesc.Left = 0;
|
||||
gif->SavedImages[0].ImageDesc.Top = 0;
|
||||
if (image->canvas_width == 0 || image->canvas_height == 0) {
|
||||
fprintf(stderr, "Invalid canvas size in GIF.\n");
|
||||
DGifCloseFile(gif, NULL);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
// Allocate frames.
|
||||
AllocateFrames(image, frame_count);
|
||||
|
||||
const uint32_t canvas_width = image->canvas_width;
|
||||
const uint32_t canvas_height = image->canvas_height;
|
||||
|
||||
// Decode and reconstruct frames.
|
||||
for (uint32_t i = 0; i < frame_count; ++i) {
|
||||
const int canvas_width_in_bytes = canvas_width * kNumChannels;
|
||||
const SavedImage* const curr_gif_image = &gif->SavedImages[i];
|
||||
GraphicsControlBlock curr_gcb = GraphicsControlBlock();
|
||||
DGifSavedExtensionToGCB(gif, i, &curr_gcb);
|
||||
|
||||
DecodedFrame* const curr_frame = &image->frames[i];
|
||||
uint8_t* const curr_rgba = curr_frame->rgba.data();
|
||||
curr_frame->duration = GetFrameDurationGIF(gif, i);
|
||||
|
||||
if (i == 0) { // Initialize as transparent.
|
||||
curr_frame->is_key_frame = true;
|
||||
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
|
||||
} else {
|
||||
DecodedFrame* const prev_frame = &image->frames[i - 1];
|
||||
const GifImageDesc& prev_desc = gif->SavedImages[i - 1].ImageDesc;
|
||||
GraphicsControlBlock prev_gcb = GraphicsControlBlock();
|
||||
DGifSavedExtensionToGCB(gif, i - 1, &prev_gcb);
|
||||
|
||||
curr_frame->is_key_frame =
|
||||
IsKeyFrameGIF(prev_desc, prev_gcb.DisposalMode, prev_frame,
|
||||
canvas_width, canvas_height);
|
||||
|
||||
if (curr_frame->is_key_frame) { // Initialize as transparent.
|
||||
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
|
||||
} else {
|
||||
// Initialize with previous canvas.
|
||||
uint8_t* const prev_rgba = image->frames[i - 1].rgba.data();
|
||||
CopyCanvas(prev_rgba, curr_rgba, canvas_width, canvas_height);
|
||||
|
||||
// Dispose previous frame rectangle.
|
||||
bool prev_frame_disposed =
|
||||
(prev_gcb.DisposalMode == DISPOSE_BACKGROUND ||
|
||||
prev_gcb.DisposalMode == DISPOSE_PREVIOUS);
|
||||
bool curr_frame_opaque =
|
||||
(curr_gcb.TransparentColor == NO_TRANSPARENT_COLOR);
|
||||
bool prev_frame_completely_covered =
|
||||
curr_frame_opaque &&
|
||||
CoversFrameGIF(curr_gif_image->ImageDesc, prev_desc);
|
||||
|
||||
if (prev_frame_disposed && !prev_frame_completely_covered) {
|
||||
switch (prev_gcb.DisposalMode) {
|
||||
case DISPOSE_BACKGROUND: {
|
||||
ZeroFillFrameRect(curr_rgba, canvas_width_in_bytes,
|
||||
prev_desc.Left, prev_desc.Top,
|
||||
prev_desc.Width, prev_desc.Height);
|
||||
break;
|
||||
}
|
||||
case DISPOSE_PREVIOUS: {
|
||||
int src_frame_num = i - 2;
|
||||
while (src_frame_num >= 0) {
|
||||
GraphicsControlBlock src_frame_gcb = GraphicsControlBlock();
|
||||
DGifSavedExtensionToGCB(gif, src_frame_num, &src_frame_gcb);
|
||||
if (src_frame_gcb.DisposalMode != DISPOSE_PREVIOUS) break;
|
||||
--src_frame_num;
|
||||
}
|
||||
if (src_frame_num >= 0) {
|
||||
// Restore pixels inside previous frame rectangle to
|
||||
// corresponding pixels in source canvas.
|
||||
uint8_t* const src_frame_rgba =
|
||||
image->frames[src_frame_num].rgba.data();
|
||||
CopyFrameRectangle(src_frame_rgba, curr_rgba,
|
||||
canvas_width_in_bytes,
|
||||
prev_desc.Left, prev_desc.Top,
|
||||
prev_desc.Width, prev_desc.Height);
|
||||
} else {
|
||||
// Source canvas doesn't exist. So clear previous frame
|
||||
// rectangle to background.
|
||||
ZeroFillFrameRect(curr_rgba, canvas_width_in_bytes,
|
||||
prev_desc.Left, prev_desc.Top,
|
||||
prev_desc.Width, prev_desc.Height);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
break; // Nothing to do.
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Decode current frame.
|
||||
if (!ReadFrameGIF(curr_gif_image, gif->SColorMap, curr_gcb.TransparentColor,
|
||||
canvas_width_in_bytes, curr_rgba)) {
|
||||
DGifCloseFile(gif, NULL);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (dump_frames) {
|
||||
if (!DumpFrame(filename, dump_folder, i, curr_rgba,
|
||||
canvas_width, canvas_height)) {
|
||||
DGifCloseFile(gif, NULL);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
}
|
||||
DGifCloseFile(gif, NULL);
|
||||
return true;
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
static bool ReadAnimatedGIF(const char filename[], AnimatedImage* const image,
|
||||
bool dump_frames, const char dump_folder[]) {
|
||||
(void)filename;
|
||||
(void)image;
|
||||
(void)dump_frames;
|
||||
(void)dump_folder;
|
||||
fprintf(stderr, "GIF support not compiled. Please install the libgif-dev "
|
||||
"package before building.\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
#endif // WEBP_HAVE_GIF
|
||||
|
||||
// -----------------------------------------------------------------------------
|
||||
|
||||
static bool ReadFile(const char filename[], std::string* filestr) {
|
||||
ifstream fin(filename, ios::binary);
|
||||
if (!fin.good()) return false;
|
||||
ostringstream strout;
|
||||
strout << fin.rdbuf();
|
||||
*filestr = strout.str();
|
||||
fin.close();
|
||||
return true;
|
||||
}
|
||||
|
||||
bool ReadAnimatedImage(const char filename[], AnimatedImage* const image,
|
||||
bool dump_frames, const char dump_folder[]) {
|
||||
std::string file_str;
|
||||
if (!ReadFile(filename, &file_str)) {
|
||||
fprintf(stderr, "Error reading file: %s\n", filename);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (IsWebP(file_str)) {
|
||||
return ReadAnimatedWebP(filename, file_str, image, dump_frames,
|
||||
dump_folder);
|
||||
} else if (IsGIF(file_str)) {
|
||||
return ReadAnimatedGIF(filename, image, dump_frames, dump_folder);
|
||||
} else {
|
||||
fprintf(stderr,
|
||||
"Unknown file type: %s. Supported file types are WebP and GIF\n",
|
||||
filename);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
|
||||
uint32_t width, uint32_t height, int* const max_diff,
|
||||
double* const psnr) {
|
||||
const uint32_t stride = width * kNumChannels;
|
||||
*max_diff = 0;
|
||||
double sse = 0.;
|
||||
for (uint32_t y = 0; y < height; ++y) {
|
||||
for (uint32_t x = 0; x < stride; ++x) {
|
||||
const size_t offset = y * stride + x;
|
||||
const int diff = abs(rgba1[offset] - rgba2[offset]);
|
||||
if (diff > *max_diff) *max_diff = diff;
|
||||
sse += diff * diff;
|
||||
}
|
||||
}
|
||||
if (*max_diff == 0) {
|
||||
*psnr = 99.; // PSNR when images are identical.
|
||||
} else {
|
||||
sse /= stride * height;
|
||||
*psnr = 10. * log10(255. * 255. / sse);
|
||||
}
|
||||
}
|
||||
47
examples/anim_util.h
Normal file
47
examples/anim_util.h
Normal file
@ -0,0 +1,47 @@
|
||||
// Copyright 2015 Google Inc. All Rights Reserved.
|
||||
//
|
||||
// Use of this source code is governed by a BSD-style license
|
||||
// that can be found in the COPYING file in the root of the source
|
||||
// tree. An additional intellectual property rights grant can be found
|
||||
// in the file PATENTS. All contributing project authors may
|
||||
// be found in the AUTHORS file in the root of the source tree.
|
||||
// -----------------------------------------------------------------------------
|
||||
//
|
||||
// Utilities for animated images
|
||||
|
||||
#ifndef WEBP_EXAMPLES_ANIM_UTIL_H_
|
||||
#define WEBP_EXAMPLES_ANIM_UTIL_H_
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "webp/config.h"
|
||||
#endif
|
||||
|
||||
#include <vector>
|
||||
|
||||
#include "webp/types.h"
|
||||
|
||||
struct DecodedFrame {
|
||||
std::vector<uint8_t> rgba; // Decoded and reconstructed full frame.
|
||||
int duration; // Frame duration in milliseconds.
|
||||
bool is_key_frame; // True if this frame is a key-frame.
|
||||
};
|
||||
|
||||
struct AnimatedImage {
|
||||
uint32_t canvas_width;
|
||||
uint32_t canvas_height;
|
||||
uint32_t bgcolor;
|
||||
uint32_t loop_count;
|
||||
std::vector<DecodedFrame> frames;
|
||||
};
|
||||
|
||||
// Read animated image file into 'AnimatedImage' struct.
|
||||
// If 'dump_frames' is true, dump frames to 'dump_folder'.
|
||||
bool ReadAnimatedImage(const char filename[], AnimatedImage* const image,
|
||||
bool dump_frames, const char dump_folder[]);
|
||||
|
||||
// Given two RGBA buffers, calculate max pixel difference and PSNR.
|
||||
void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
|
||||
uint32_t width, uint32_t height, int* const max_diff,
|
||||
double* const psnr);
|
||||
|
||||
#endif // WEBP_EXAMPLES_ANIM_UTIL_H_
|
||||
@ -62,14 +62,19 @@ EXTRA_FLAGS += -DWEBP_USE_THREAD
|
||||
EXTRA_LIBS += -lpthread
|
||||
|
||||
# Extra flags to emulate C89 strictness with the full ANSI
|
||||
EXTRA_FLAGS += -Wextra -Wold-style-definition
|
||||
EXTRA_FLAGS += -Wmissing-prototypes
|
||||
EXTRA_FLAGS += -Wmissing-declarations
|
||||
EXTRA_FLAGS += -Wdeclaration-after-statement
|
||||
EXTRA_FLAGS += -Wshadow
|
||||
EXTRA_FLAGS += -Wformat-security -Wformat-nonliteral
|
||||
EXTRA_C89_FLAGS = -Wextra -Wold-style-definition
|
||||
EXTRA_C89_FLAGS += -Wmissing-prototypes
|
||||
EXTRA_C89_FLAGS += -Wmissing-declarations
|
||||
EXTRA_C89_FLAGS += -Wdeclaration-after-statement
|
||||
EXTRA_C89_FLAGS += -Wshadow
|
||||
EXTRA_C89_FLAGS += -Wformat-security -Wformat-nonliteral
|
||||
# EXTRA_C89_FLAGS += -Wvla
|
||||
|
||||
# EXTRA_FLAGS += -Wvla
|
||||
EXTRA_CXX_FLAGS = -Wextra
|
||||
EXTRA_CXX_FLAGS += -Wmissing-declarations
|
||||
EXTRA_CXX_FLAGS += -Wshadow
|
||||
EXTRA_CXX_FLAGS += -Wformat-security -Wformat-nonliteral
|
||||
# EXTRA_CXX_FLAGS += -Wvla
|
||||
|
||||
# SSE4.1-specific flags:
|
||||
ifeq ($(HAVE_SSE41), 1)
|
||||
@ -91,14 +96,20 @@ endif
|
||||
|
||||
AR = ar
|
||||
ARFLAGS = r
|
||||
CC = gcc
|
||||
CPPFLAGS = -Isrc/ -Wall
|
||||
CFLAGS = -O3 -DNDEBUG $(EXTRA_FLAGS)
|
||||
COMMONFLAGS = -O3 -DNDEBUG $(EXTRA_FLAGS)
|
||||
CC = gcc
|
||||
CFLAGS = $(COMMONFLAGS) $(EXTRA_C89_FLAGS)
|
||||
CXX = g++
|
||||
CXXFLAGS = $(COMMONFLAGS) $(EXTRA_CXX_FLAGS)
|
||||
INSTALL = install
|
||||
GROFF = /usr/bin/groff
|
||||
COL = /usr/bin/col
|
||||
LDFLAGS = $(EXTRA_LIBS) $(EXTRA_FLAGS) -lm
|
||||
|
||||
ANIM_UTIL_OBJS = \
|
||||
examples/anim_util.o \
|
||||
|
||||
DEC_OBJS = \
|
||||
src/dec/alpha.o \
|
||||
src/dec/buffer.o \
|
||||
@ -282,16 +293,17 @@ OUT_LIBS = examples/libexample_util.a src/libwebpdecoder.a src/libwebp.a
|
||||
EXTRA_LIB = src/libwebpextras.a
|
||||
OUT_EXAMPLES = examples/cwebp examples/dwebp
|
||||
EXTRA_EXAMPLES = examples/gif2webp examples/vwebp examples/webpmux
|
||||
EXTRA_CXX_EXAMPLES = examples/anim_diff
|
||||
|
||||
OUTPUT = $(OUT_LIBS) $(OUT_EXAMPLES)
|
||||
ifeq ($(MAKECMDGOALS),clean)
|
||||
OUTPUT += $(EXTRA_EXAMPLES)
|
||||
OUTPUT += $(EXTRA_EXAMPLES) $(EXTRA_CXX_EXAMPLES)
|
||||
OUTPUT += src/demux/libwebpdemux.a src/mux/libwebpmux.a $(EXTRA_LIB)
|
||||
OUTPUT += examples/libgifdec.a
|
||||
OUTPUT += examples/libgifdec.a examples/libanim_util.a
|
||||
endif
|
||||
|
||||
ex: $(OUT_EXAMPLES)
|
||||
all: ex $(EXTRA_EXAMPLES)
|
||||
all: ex $(EXTRA_EXAMPLES) $(EXTRA_CXX_EXAMPLES)
|
||||
extras: $(EXTRA_LIB)
|
||||
|
||||
$(EX_FORMAT_DEC_OBJS): %.o: %.h
|
||||
@ -307,6 +319,10 @@ src/utils/bit_writer.o: src/utils/endian_inl.h
|
||||
%.o: %.c $(HDRS)
|
||||
$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
|
||||
|
||||
%.o: %.cc $(HDRS)
|
||||
$(CXX) $(CXXFLAGS) $(CPPFLAGS) -c $< -o $@
|
||||
|
||||
examples/libanim_util.a: $(ANIM_UTIL_OBJS)
|
||||
examples/libexample_util.a: $(EX_UTIL_OBJS)
|
||||
examples/libgifdec.a: $(GIFDEC_OBJS)
|
||||
src/libwebpdecoder.a: $(LIBWEBPDECODER_OBJS)
|
||||
@ -318,12 +334,17 @@ src/libwebpextras.a: $(LIBWEBPEXTRA_OBJS)
|
||||
%.a:
|
||||
$(AR) $(ARFLAGS) $@ $^
|
||||
|
||||
examples/anim_diff: examples/anim_diff.o $(ANIM_UTIL_OBJS) $(GIFDEC_OBJS)
|
||||
examples/cwebp: examples/cwebp.o $(EX_FORMAT_DEC_OBJS)
|
||||
examples/dwebp: examples/dwebp.o
|
||||
examples/gif2webp: examples/gif2webp.o $(GIFDEC_OBJS)
|
||||
examples/vwebp: examples/vwebp.o
|
||||
examples/webpmux: examples/webpmux.o
|
||||
|
||||
examples/anim_diff: examples/libanim_util.a examples/libgifdec.a
|
||||
examples/anim_diff: src/demux/libwebpdemux.a src/libwebp.a
|
||||
examples/anim_diff: EXTRA_LIBS += $(GIF_LIBS)
|
||||
examples/anim_diff: EXTRA_FLAGS += -DWEBP_HAVE_GIF
|
||||
examples/cwebp: examples/libexample_util.a src/libwebp.a
|
||||
examples/cwebp: EXTRA_LIBS += $(CWEBP_LIBS)
|
||||
examples/dwebp: examples/libexample_util.a src/libwebpdecoder.a
|
||||
@ -342,6 +363,9 @@ examples/webpmux: src/libwebpdecoder.a
|
||||
$(OUT_EXAMPLES) $(EXTRA_EXAMPLES):
|
||||
$(CC) -o $@ $^ $(LDFLAGS)
|
||||
|
||||
$(EXTRA_CXX_EXAMPLES):
|
||||
$(CXX) -o $@ $^ $(LDFLAGS)
|
||||
|
||||
dist: DESTDIR := dist
|
||||
dist: OUT_EXAMPLES += $(EXTRA_EXAMPLES)
|
||||
dist: all
|
||||
|
||||
Loading…
Reference in New Issue
Block a user