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Squashed 'external/libwebp/libwebp/' content from commit dd7364c3c

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git-subtree-dir: external/libwebp/libwebp
git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f
This commit is contained in:
Green Sky
2023-08-02 14:57:22 +02:00
commit 67653bbe50
331 changed files with 116119 additions and 0 deletions
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96
examples/Android.mk Normal file
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# Ignore this file during non-NDK builds.
ifdef NDK_ROOT
LOCAL_PATH := $(call my-dir)
################################################################################
# libexample_util
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
example_util.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
LOCAL_MODULE := example_util
include $(BUILD_STATIC_LIBRARY)
################################################################################
# cwebp
include $(CLEAR_VARS)
# Note: to enable jpeg/png encoding the sources from AOSP can be used with
# minor modification to their Android.mk files.
LOCAL_SRC_FILES := \
cwebp.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_STATIC_LIBRARIES := example_util imageio_util imagedec webpdemux webp
LOCAL_MODULE := cwebp
include $(BUILD_EXECUTABLE)
################################################################################
# dwebp
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
dwebp.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_STATIC_LIBRARIES := example_util imagedec imageenc webpdemux webp
LOCAL_MODULE := dwebp
include $(BUILD_EXECUTABLE)
################################################################################
# webpmux
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
webpmux.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_STATIC_LIBRARIES := example_util imageio_util webpmux webp
LOCAL_MODULE := webpmux_example
include $(BUILD_EXECUTABLE)
################################################################################
# img2webp
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
img2webp.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_STATIC_LIBRARIES := example_util imageio_util imagedec webpmux webpdemux \
webp
LOCAL_MODULE := img2webp_example
include $(BUILD_EXECUTABLE)
################################################################################
# webpinfo
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
webpinfo.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_STATIC_LIBRARIES := example_util imageio_util webp
LOCAL_MODULE := webpinfo_example
include $(BUILD_EXECUTABLE)
endif # NDK_ROOT

119
examples/Makefile.am Normal file
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AM_CPPFLAGS += -I$(top_builddir)/src -I$(top_srcdir)/src
bin_PROGRAMS =
if BUILD_DEMUX
bin_PROGRAMS += dwebp cwebp
endif
if BUILD_ANIMDIFF
noinst_PROGRAMS = anim_diff anim_dump
endif
if BUILD_GIF2WEBP
bin_PROGRAMS += gif2webp
endif
if BUILD_IMG2WEBP
bin_PROGRAMS += img2webp
endif
if BUILD_MUX
bin_PROGRAMS += webpmux
endif
if BUILD_VWEBP
bin_PROGRAMS += vwebp
endif
if BUILD_WEBPINFO
bin_PROGRAMS += webpinfo
endif
noinst_LTLIBRARIES = libexample_util.la
libexample_util_la_SOURCES = example_util.c example_util.h
libexample_util_la_LIBADD = ../src/libwebp.la
anim_diff_SOURCES = anim_diff.c anim_util.c anim_util.h gifdec.c gifdec.h
anim_diff_CPPFLAGS = $(AM_CPPFLAGS) $(GIF_INCLUDES)
anim_diff_LDADD =
anim_diff_LDADD += ../src/demux/libwebpdemux.la
anim_diff_LDADD += libexample_util.la
anim_diff_LDADD += ../imageio/libimageio_util.la
anim_diff_LDADD += $(GIF_LIBS) -lm
anim_dump_SOURCES = anim_dump.c anim_util.c anim_util.h gifdec.c gifdec.h
anim_dump_CPPFLAGS = $(AM_CPPFLAGS) $(PNG_INCLUDES)
anim_dump_CPPFLAGS += $(GIF_INCLUDES)
anim_dump_LDADD =
anim_dump_LDADD += ../src/demux/libwebpdemux.la
anim_dump_LDADD += libexample_util.la
anim_dump_LDADD += ../imageio/libimageio_util.la
anim_dump_LDADD += ../imageio/libimageenc.la
anim_dump_LDADD += $(PNG_LIBS) $(GIF_LIBS) $(TIFF_LIBS) -lm
cwebp_SOURCES = cwebp.c stopwatch.h
cwebp_CPPFLAGS = $(AM_CPPFLAGS) -I$(top_srcdir)
cwebp_LDADD =
cwebp_LDADD += libexample_util.la
cwebp_LDADD += ../imageio/libimageio_util.la
cwebp_LDADD += ../imageio/libimagedec.la
cwebp_LDADD += ../src/libwebp.la
cwebp_LDADD += $(JPEG_LIBS) $(PNG_LIBS) $(TIFF_LIBS)
dwebp_SOURCES = dwebp.c stopwatch.h
dwebp_CPPFLAGS = $(AM_CPPFLAGS)
dwebp_CPPFLAGS += $(JPEG_INCLUDES) $(PNG_INCLUDES)
dwebp_LDADD =
dwebp_LDADD += libexample_util.la
dwebp_LDADD += ../imageio/libimagedec.la
dwebp_LDADD += ../imageio/libimageenc.la
dwebp_LDADD += ../imageio/libimageio_util.la
dwebp_LDADD += ../src/libwebp.la
dwebp_LDADD +=$(PNG_LIBS) $(JPEG_LIBS)
gif2webp_SOURCES = gif2webp.c gifdec.c gifdec.h
gif2webp_CPPFLAGS = $(AM_CPPFLAGS) $(GIF_INCLUDES)
gif2webp_LDADD =
gif2webp_LDADD += libexample_util.la
gif2webp_LDADD += ../imageio/libimageio_util.la
gif2webp_LDADD += ../src/mux/libwebpmux.la
gif2webp_LDADD += ../src/libwebp.la
gif2webp_LDADD += $(GIF_LIBS)
vwebp_SOURCES = vwebp.c
vwebp_CPPFLAGS = $(AM_CPPFLAGS) $(GL_INCLUDES)
vwebp_LDADD =
vwebp_LDADD += libexample_util.la
vwebp_LDADD += ../imageio/libimageio_util.la
vwebp_LDADD += ../src/demux/libwebpdemux.la
vwebp_LDADD += $(GL_LIBS)
webpmux_SOURCES = webpmux.c
webpmux_CPPFLAGS = $(AM_CPPFLAGS)
webpmux_LDADD =
webpmux_LDADD += libexample_util.la
webpmux_LDADD += ../imageio/libimageio_util.la
webpmux_LDADD += ../src/mux/libwebpmux.la
webpmux_LDADD += ../src/libwebp.la
img2webp_SOURCES = img2webp.c
img2webp_CPPFLAGS = $(AM_CPPFLAGS) -I$(top_srcdir)
img2webp_LDADD =
img2webp_LDADD += libexample_util.la
img2webp_LDADD += ../imageio/libimageio_util.la
img2webp_LDADD += ../imageio/libimagedec.la
img2webp_LDADD += ../src/mux/libwebpmux.la
img2webp_LDADD += ../src/libwebp.la
img2webp_LDADD += $(PNG_LIBS) $(JPEG_LIBS) $(TIFF_LIBS)
webpinfo_SOURCES = webpinfo.c
webpinfo_CPPFLAGS = $(AM_CPPFLAGS)
webpinfo_LDADD =
webpinfo_LDADD += libexample_util.la
webpinfo_LDADD += ../imageio/libimageio_util.la
webpinfo_LDADD += ../src/libwebp.la
if BUILD_LIBWEBPDECODER
anim_diff_LDADD += ../src/libwebpdecoder.la
anim_dump_LDADD += ../src/libwebpdecoder.la
vwebp_LDADD += ../src/libwebpdecoder.la
else
anim_diff_LDADD += ../src/libwebp.la
anim_dump_LDADD += ../src/libwebp.la
vwebp_LDADD += ../src/libwebp.la
endif

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// 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.
// -----------------------------------------------------------------------------
//
// Checks if given pair of animated GIF/WebP images are identical:
// That is: their reconstructed canvases match pixel-by-pixel and their other
// animation properties (loop count etc) also match.
//
// example: anim_diff foo.gif bar.webp
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h> // for 'strtod'.
#include <string.h> // for 'strcmp'.
#include "./anim_util.h"
#include "./example_util.h"
#include "./unicode.h"
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
// Returns true if 'a + b' will overflow.
static int AdditionWillOverflow(int a, int b) {
return (b > 0) && (a > INT_MAX - b);
}
static int FramesAreEqual(const uint8_t* const rgba1,
const uint8_t* const rgba2, int width, int height) {
const int stride = width * 4; // Always true for 'DecodedFrame.rgba'.
return !memcmp(rgba1, rgba2, stride * height);
}
static WEBP_INLINE int PixelsAreSimilar(uint32_t src, uint32_t dst,
int max_allowed_diff) {
const int src_a = (src >> 24) & 0xff;
const int src_r = (src >> 16) & 0xff;
const int src_g = (src >> 8) & 0xff;
const int src_b = (src >> 0) & 0xff;
const int dst_a = (dst >> 24) & 0xff;
const int dst_r = (dst >> 16) & 0xff;
const int dst_g = (dst >> 8) & 0xff;
const int dst_b = (dst >> 0) & 0xff;
return (abs(src_r * src_a - dst_r * dst_a) <= (max_allowed_diff * 255)) &&
(abs(src_g * src_a - dst_g * dst_a) <= (max_allowed_diff * 255)) &&
(abs(src_b * src_a - dst_b * dst_a) <= (max_allowed_diff * 255)) &&
(abs(src_a - dst_a) <= max_allowed_diff);
}
static int FramesAreSimilar(const uint8_t* const rgba1,
const uint8_t* const rgba2,
int width, int height, int max_allowed_diff) {
int i, j;
assert(max_allowed_diff > 0);
for (j = 0; j < height; ++j) {
for (i = 0; i < width; ++i) {
const int stride = width * 4;
const size_t offset = j * stride + i;
if (!PixelsAreSimilar(rgba1[offset], rgba2[offset], max_allowed_diff)) {
return 0;
}
}
}
return 1;
}
// Minimize number of frames by combining successive frames that have at max
// 'max_diff' difference per channel between corresponding pixels.
static void MinimizeAnimationFrames(AnimatedImage* const img, int max_diff) {
uint32_t i;
for (i = 1; i < img->num_frames; ++i) {
DecodedFrame* const frame1 = &img->frames[i - 1];
DecodedFrame* const frame2 = &img->frames[i];
const uint8_t* const rgba1 = frame1->rgba;
const uint8_t* const rgba2 = frame2->rgba;
int should_merge_frames = 0;
// If merging frames will result in integer overflow for 'duration',
// skip merging.
if (AdditionWillOverflow(frame1->duration, frame2->duration)) continue;
if (max_diff > 0) {
should_merge_frames = FramesAreSimilar(rgba1, rgba2, img->canvas_width,
img->canvas_height, max_diff);
} else {
should_merge_frames =
FramesAreEqual(rgba1, rgba2, img->canvas_width, img->canvas_height);
}
if (should_merge_frames) { // Merge 'i+1'th frame into 'i'th frame.
frame1->duration += frame2->duration;
if (i + 1 < img->num_frames) {
memmove(&img->frames[i], &img->frames[i + 1],
(img->num_frames - i - 1) * sizeof(*img->frames));
}
--img->num_frames;
--i;
}
}
}
static int CompareValues(uint32_t a, uint32_t b, const char* output_str) {
if (a != b) {
fprintf(stderr, "%s: %d vs %d\n", output_str, a, b);
return 0;
}
return 1;
}
static int CompareBackgroundColor(uint32_t bg1, uint32_t bg2, int premultiply) {
if (premultiply) {
const int alpha1 = (bg1 >> 24) & 0xff;
const int alpha2 = (bg2 >> 24) & 0xff;
if (alpha1 == 0 && alpha2 == 0) return 1;
}
if (bg1 != bg2) {
fprintf(stderr, "Background color mismatch: 0x%08x vs 0x%08x\n",
bg1, bg2);
return 0;
}
return 1;
}
// Note: As long as frame durations and reconstructed frames are identical, it
// is OK for other aspects like offsets, dispose/blend method to vary.
static int CompareAnimatedImagePair(const AnimatedImage* const img1,
const AnimatedImage* const img2,
int premultiply,
double min_psnr) {
int ok = 1;
const int is_multi_frame_image = (img1->num_frames > 1);
uint32_t i;
ok = CompareValues(img1->canvas_width, img2->canvas_width,
"Canvas width mismatch") && ok;
ok = CompareValues(img1->canvas_height, img2->canvas_height,
"Canvas height mismatch") && ok;
ok = CompareValues(img1->num_frames, img2->num_frames,
"Frame count mismatch") && ok;
if (!ok) return 0; // These are fatal failures, can't proceed.
if (is_multi_frame_image) { // Checks relevant for multi-frame images only.
int max_loop_count_workaround = 0;
// Transcodes to webp increase the gif loop count by 1 for compatibility.
// When the gif has the maximum value the webp value will be off by one.
if ((img1->format == ANIM_GIF && img1->loop_count == 65536 &&
img2->format == ANIM_WEBP && img2->loop_count == 65535) ||
(img1->format == ANIM_WEBP && img1->loop_count == 65535 &&
img2->format == ANIM_GIF && img2->loop_count == 65536)) {
max_loop_count_workaround = 1;
}
ok = (max_loop_count_workaround ||
CompareValues(img1->loop_count, img2->loop_count,
"Loop count mismatch")) && ok;
ok = CompareBackgroundColor(img1->bgcolor, img2->bgcolor,
premultiply) && ok;
}
for (i = 0; i < img1->num_frames; ++i) {
// Pixel-by-pixel comparison.
const uint8_t* const rgba1 = img1->frames[i].rgba;
const uint8_t* const rgba2 = img2->frames[i].rgba;
int max_diff;
double psnr;
if (is_multi_frame_image) { // Check relevant for multi-frame images only.
const char format[] = "Frame #%d, duration mismatch";
char tmp[sizeof(format) + 8];
ok = ok && (snprintf(tmp, sizeof(tmp), format, i) >= 0);
ok = ok && CompareValues(img1->frames[i].duration,
img2->frames[i].duration, tmp);
}
GetDiffAndPSNR(rgba1, rgba2, img1->canvas_width, img1->canvas_height,
premultiply, &max_diff, &psnr);
if (min_psnr > 0.) {
if (psnr < min_psnr) {
fprintf(stderr, "Frame #%d, psnr = %.2lf (min_psnr = %f)\n", i,
psnr, min_psnr);
ok = 0;
}
} else {
if (max_diff != 0) {
fprintf(stderr, "Frame #%d, max pixel diff: %d\n", i, max_diff);
ok = 0;
}
}
}
return ok;
}
static void Help(void) {
printf("Usage: anim_diff <image1> <image2> [options]\n");
printf("\nOptions:\n");
printf(" -dump_frames <folder> dump decoded frames in PAM format\n");
printf(" -min_psnr <float> ... minimum per-frame PSNR\n");
printf(" -raw_comparison ..... if this flag is not used, RGB is\n");
printf(" premultiplied before comparison\n");
printf(" -max_diff <int> ..... maximum allowed difference per channel\n"
" between corresponding pixels in subsequent\n"
" frames\n");
printf(" -h .................. this help\n");
printf(" -version ............ print version number and exit\n");
}
int main(int argc, const char* argv[]) {
int return_code = -1;
int dump_frames = 0;
const char* dump_folder = NULL;
double min_psnr = 0.;
int got_input1 = 0;
int got_input2 = 0;
int premultiply = 1;
int max_diff = 0;
int i, c;
const char* files[2] = { NULL, NULL };
AnimatedImage images[2];
INIT_WARGV(argc, argv);
for (c = 1; c < argc; ++c) {
int parse_error = 0;
if (!strcmp(argv[c], "-dump_frames")) {
if (c < argc - 1) {
dump_frames = 1;
dump_folder = (const char*)GET_WARGV(argv, ++c);
} else {
parse_error = 1;
}
} else if (!strcmp(argv[c], "-min_psnr")) {
if (c < argc - 1) {
min_psnr = ExUtilGetFloat(argv[++c], &parse_error);
} else {
parse_error = 1;
}
} else if (!strcmp(argv[c], "-raw_comparison")) {
premultiply = 0;
} else if (!strcmp(argv[c], "-max_diff")) {
if (c < argc - 1) {
max_diff = ExUtilGetInt(argv[++c], 0, &parse_error);
} else {
parse_error = 1;
}
} else if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-version")) {
int dec_version, demux_version;
GetAnimatedImageVersions(&dec_version, &demux_version);
printf("WebP Decoder version: %d.%d.%d\nWebP Demux version: %d.%d.%d\n",
(dec_version >> 16) & 0xff, (dec_version >> 8) & 0xff,
(dec_version >> 0) & 0xff,
(demux_version >> 16) & 0xff, (demux_version >> 8) & 0xff,
(demux_version >> 0) & 0xff);
FREE_WARGV_AND_RETURN(0);
} else {
if (!got_input1) {
files[0] = (const char*)GET_WARGV(argv, c);
got_input1 = 1;
} else if (!got_input2) {
files[1] = (const char*)GET_WARGV(argv, c);
got_input2 = 1;
} else {
parse_error = 1;
}
}
if (parse_error) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
}
if (argc < 3) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
if (!got_input2) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
if (dump_frames) {
WPRINTF("Dumping decoded frames in: %s\n", (const W_CHAR*)dump_folder);
}
memset(images, 0, sizeof(images));
for (i = 0; i < 2; ++i) {
WPRINTF("Decoding file: %s\n", (const W_CHAR*)files[i]);
if (!ReadAnimatedImage(files[i], &images[i], dump_frames, dump_folder)) {
WFPRINTF(stderr, "Error decoding file: %s\n Aborting.\n",
(const W_CHAR*)files[i]);
return_code = -2;
goto End;
} else {
MinimizeAnimationFrames(&images[i], max_diff);
}
}
if (!CompareAnimatedImagePair(&images[0], &images[1],
premultiply, min_psnr)) {
WFPRINTF(stderr, "\nFiles %s and %s differ.\n", (const W_CHAR*)files[0],
(const W_CHAR*)files[1]);
return_code = -3;
} else {
WPRINTF("\nFiles %s and %s are identical.\n", (const W_CHAR*)files[0],
(const W_CHAR*)files[1]);
return_code = 0;
}
End:
ClearAnimatedImage(&images[0]);
ClearAnimatedImage(&images[1]);
FREE_WARGV_AND_RETURN(return_code);
}

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// Copyright 2017 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.
// -----------------------------------------------------------------------------
//
// Decodes an animated WebP file and dumps the decoded frames as PNG or TIFF.
//
// Author: Skal (pascal.massimino@gmail.com)
#include <stdio.h>
#include <string.h> // for 'strcmp'.
#include "./anim_util.h"
#include "webp/decode.h"
#include "../imageio/image_enc.h"
#include "./unicode.h"
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
static void Help(void) {
printf("Usage: anim_dump [options] files...\n");
printf("\nOptions:\n");
printf(" -folder <string> .... dump folder (default: '.')\n");
printf(" -prefix <string> .... prefix for dumped frames "
"(default: 'dump_')\n");
printf(" -tiff ............... save frames as TIFF\n");
printf(" -pam ................ save frames as PAM\n");
printf(" -h .................. this help\n");
printf(" -version ............ print version number and exit\n");
}
int main(int argc, const char* argv[]) {
int error = 0;
const W_CHAR* dump_folder = TO_W_CHAR(".");
const W_CHAR* prefix = TO_W_CHAR("dump_");
const W_CHAR* suffix = TO_W_CHAR("png");
WebPOutputFileFormat format = PNG;
int c;
INIT_WARGV(argc, argv);
if (argc < 2) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
for (c = 1; !error && c < argc; ++c) {
if (!strcmp(argv[c], "-folder")) {
if (c + 1 == argc) {
fprintf(stderr, "missing argument after option '%s'\n", argv[c]);
error = 1;
break;
}
dump_folder = GET_WARGV(argv, ++c);
} else if (!strcmp(argv[c], "-prefix")) {
if (c + 1 == argc) {
fprintf(stderr, "missing argument after option '%s'\n", argv[c]);
error = 1;
break;
}
prefix = GET_WARGV(argv, ++c);
} else if (!strcmp(argv[c], "-tiff")) {
format = TIFF;
suffix = TO_W_CHAR("tiff");
} else if (!strcmp(argv[c], "-pam")) {
format = PAM;
suffix = TO_W_CHAR("pam");
} else if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-version")) {
int dec_version, demux_version;
GetAnimatedImageVersions(&dec_version, &demux_version);
printf("WebP Decoder version: %d.%d.%d\nWebP Demux version: %d.%d.%d\n",
(dec_version >> 16) & 0xff, (dec_version >> 8) & 0xff,
(dec_version >> 0) & 0xff,
(demux_version >> 16) & 0xff, (demux_version >> 8) & 0xff,
(demux_version >> 0) & 0xff);
FREE_WARGV_AND_RETURN(0);
} else {
uint32_t i;
AnimatedImage image;
const W_CHAR* const file = GET_WARGV(argv, c);
memset(&image, 0, sizeof(image));
WPRINTF("Decoding file: %s as %s/%sxxxx.%s\n",
file, dump_folder, prefix, suffix);
if (!ReadAnimatedImage((const char*)file, &image, 0, NULL)) {
WFPRINTF(stderr, "Error decoding file: %s\n Aborting.\n", file);
error = 1;
break;
}
for (i = 0; !error && i < image.num_frames; ++i) {
W_CHAR out_file[1024];
WebPDecBuffer buffer;
WebPInitDecBuffer(&buffer);
buffer.colorspace = MODE_RGBA;
buffer.is_external_memory = 1;
buffer.width = image.canvas_width;
buffer.height = image.canvas_height;
buffer.u.RGBA.rgba = image.frames[i].rgba;
buffer.u.RGBA.stride = buffer.width * sizeof(uint32_t);
buffer.u.RGBA.size = buffer.u.RGBA.stride * buffer.height;
WSNPRINTF(out_file, sizeof(out_file), "%s/%s%.4d.%s",
dump_folder, prefix, i, suffix);
if (!WebPSaveImage(&buffer, format, (const char*)out_file)) {
WFPRINTF(stderr, "Error while saving image '%s'\n", out_file);
error = 1;
}
WebPFreeDecBuffer(&buffer);
}
ClearAnimatedImage(&image);
}
}
FREE_WARGV_AND_RETURN(error ? 1 : 0);
}

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// 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
#include "./anim_util.h"
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#if defined(WEBP_HAVE_GIF)
#include <gif_lib.h>
#endif
#include "webp/format_constants.h"
#include "webp/decode.h"
#include "webp/demux.h"
#include "../imageio/imageio_util.h"
#include "./gifdec.h"
#include "./unicode.h"
#include "./unicode_gif.h"
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
static const int kNumChannels = 4;
// -----------------------------------------------------------------------------
// Common utilities.
#if defined(WEBP_HAVE_GIF)
// Returns true if the frame covers the full canvas.
static int IsFullFrame(int width, int height,
int canvas_width, int canvas_height) {
return (width == canvas_width && height == canvas_height);
}
#endif // WEBP_HAVE_GIF
static int CheckSizeForOverflow(uint64_t size) {
return (size == (size_t)size);
}
static int AllocateFrames(AnimatedImage* const image, uint32_t num_frames) {
uint32_t i;
uint8_t* mem = NULL;
DecodedFrame* frames = NULL;
const uint64_t rgba_size =
(uint64_t)image->canvas_width * kNumChannels * image->canvas_height;
const uint64_t total_size = (uint64_t)num_frames * rgba_size * sizeof(*mem);
const uint64_t total_frame_size = (uint64_t)num_frames * sizeof(*frames);
if (!CheckSizeForOverflow(total_size) ||
!CheckSizeForOverflow(total_frame_size)) {
return 0;
}
mem = (uint8_t*)WebPMalloc((size_t)total_size);
frames = (DecodedFrame*)WebPMalloc((size_t)total_frame_size);
if (mem == NULL || frames == NULL) {
WebPFree(mem);
WebPFree(frames);
return 0;
}
WebPFree(image->raw_mem);
image->num_frames = num_frames;
image->frames = frames;
for (i = 0; i < num_frames; ++i) {
frames[i].rgba = mem + i * rgba_size;
frames[i].duration = 0;
frames[i].is_key_frame = 0;
}
image->raw_mem = mem;
return 1;
}
void ClearAnimatedImage(AnimatedImage* const image) {
if (image != NULL) {
WebPFree(image->raw_mem);
WebPFree(image->frames);
image->num_frames = 0;
image->frames = NULL;
image->raw_mem = NULL;
}
}
#if defined(WEBP_HAVE_GIF)
// 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) {
int j;
assert(width * kNumChannels <= rgba_stride);
rgba += y_offset * rgba_stride + x_offset * kNumChannels;
for (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) {
int j;
const int width_in_bytes = width * kNumChannels;
const size_t offset = y_offset * stride + x_offset * kNumChannels;
assert(width_in_bytes <= stride);
src += offset;
dst += offset;
for (j = 0; j < height; ++j) {
memcpy(dst, src, width_in_bytes);
src += stride;
dst += stride;
}
}
#endif // WEBP_HAVE_GIF
// 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 int DumpFrame(const char filename[], const char dump_folder[],
uint32_t frame_num, const uint8_t rgba[],
int canvas_width, int canvas_height) {
int ok = 0;
size_t max_len;
int y;
const W_CHAR* base_name = NULL;
W_CHAR* file_name = NULL;
FILE* f = NULL;
const char* row;
if (dump_folder == NULL) dump_folder = (const char*)TO_W_CHAR(".");
base_name = WSTRRCHR(filename, '/');
base_name = (base_name == NULL) ? (const W_CHAR*)filename : base_name + 1;
max_len = WSTRLEN(dump_folder) + 1 + WSTRLEN(base_name)
+ strlen("_frame_") + strlen(".pam") + 8;
file_name = (W_CHAR*)WebPMalloc(max_len * sizeof(*file_name));
if (file_name == NULL) goto End;
if (WSNPRINTF(file_name, max_len, "%s/%s_frame_%d.pam",
(const W_CHAR*)dump_folder, base_name, frame_num) < 0) {
fprintf(stderr, "Error while generating file name\n");
goto End;
}
f = WFOPEN(file_name, "wb");
if (f == NULL) {
WFPRINTF(stderr, "Error opening file for writing: %s\n", file_name);
ok = 0;
goto End;
}
if (fprintf(f, "P7\nWIDTH %d\nHEIGHT %d\n"
"DEPTH 4\nMAXVAL 255\nTUPLTYPE RGB_ALPHA\nENDHDR\n",
canvas_width, canvas_height) < 0) {
WFPRINTF(stderr, "Write error for file %s\n", file_name);
goto End;
}
row = (const char*)rgba;
for (y = 0; y < canvas_height; ++y) {
if (fwrite(row, canvas_width * kNumChannels, 1, f) != 1) {
WFPRINTF(stderr, "Error writing to file: %s\n", file_name);
goto End;
}
row += canvas_width * kNumChannels;
}
ok = 1;
End:
if (f != NULL) fclose(f);
WebPFree(file_name);
return ok;
}
// -----------------------------------------------------------------------------
// WebP Decoding.
// Returns true if this is a valid WebP bitstream.
static int IsWebP(const WebPData* const webp_data) {
return (WebPGetInfo(webp_data->bytes, webp_data->size, NULL, NULL) != 0);
}
// Read animated WebP bitstream 'webp_data' into 'AnimatedImage' struct.
static int ReadAnimatedWebP(const char filename[],
const WebPData* const webp_data,
AnimatedImage* const image, int dump_frames,
const char dump_folder[]) {
int ok = 0;
int dump_ok = 1;
uint32_t frame_index = 0;
int prev_frame_timestamp = 0;
WebPAnimDecoder* dec;
WebPAnimInfo anim_info;
memset(image, 0, sizeof(*image));
dec = WebPAnimDecoderNew(webp_data, NULL);
if (dec == NULL) {
WFPRINTF(stderr, "Error parsing image: %s\n", (const W_CHAR*)filename);
goto End;
}
if (!WebPAnimDecoderGetInfo(dec, &anim_info)) {
fprintf(stderr, "Error getting global info about the animation\n");
goto End;
}
// Animation properties.
image->canvas_width = anim_info.canvas_width;
image->canvas_height = anim_info.canvas_height;
image->loop_count = anim_info.loop_count;
image->bgcolor = anim_info.bgcolor;
// Allocate frames.
if (!AllocateFrames(image, anim_info.frame_count)) goto End;
// Decode frames.
while (WebPAnimDecoderHasMoreFrames(dec)) {
DecodedFrame* curr_frame;
uint8_t* curr_rgba;
uint8_t* frame_rgba;
int timestamp;
if (!WebPAnimDecoderGetNext(dec, &frame_rgba, &timestamp)) {
fprintf(stderr, "Error decoding frame #%u\n", frame_index);
goto End;
}
assert(frame_index < anim_info.frame_count);
curr_frame = &image->frames[frame_index];
curr_rgba = curr_frame->rgba;
curr_frame->duration = timestamp - prev_frame_timestamp;
curr_frame->is_key_frame = 0; // Unused.
memcpy(curr_rgba, frame_rgba,
image->canvas_width * kNumChannels * image->canvas_height);
// Needed only because we may want to compare with GIF later.
CleanupTransparentPixels((uint32_t*)curr_rgba,
image->canvas_width, image->canvas_height);
if (dump_frames && dump_ok) {
dump_ok = DumpFrame(filename, dump_folder, frame_index, curr_rgba,
image->canvas_width, image->canvas_height);
if (!dump_ok) { // Print error once, but continue decode loop.
fprintf(stderr, "Error dumping frames to %s\n", dump_folder);
}
}
++frame_index;
prev_frame_timestamp = timestamp;
}
ok = dump_ok;
if (ok) image->format = ANIM_WEBP;
End:
WebPAnimDecoderDelete(dec);
return ok;
}
// -----------------------------------------------------------------------------
// GIF Decoding.
#if defined(WEBP_HAVE_GIF)
// Returns true if this is a valid GIF bitstream.
static int IsGIF(const WebPData* const data) {
return data->size > GIF_STAMP_LEN &&
(!memcmp(GIF_STAMP, data->bytes, GIF_STAMP_LEN) ||
!memcmp(GIF87_STAMP, data->bytes, GIF_STAMP_LEN) ||
!memcmp(GIF89_STAMP, data->bytes, GIF_STAMP_LEN));
}
// 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 {
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
int 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 = (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 = 0;
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, (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 int IsKeyFrameGIF(const GifImageDesc* prev_desc, int prev_dispose,
const DecodedFrame* const prev_frame,
int canvas_width, int canvas_height) {
if (prev_frame == NULL) return 1;
if (prev_dispose == DISPOSE_BACKGROUND) {
if (IsFullFrame(prev_desc->Width, prev_desc->Height,
canvas_width, canvas_height)) {
return 1;
}
if (prev_frame->is_key_frame) return 1;
}
return 0;
}
static int GetTransparentIndexGIF(GifFileType* gif) {
GraphicsControlBlock first_gcb;
memset(&first_gcb, 0, sizeof(first_gcb));
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 0x00000000; // Special case: transparent black.
} 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 (0xffu << 24) |
(color.Red << 16) |
(color.Green << 8) |
(color.Blue << 0);
}
}
// Find appropriate app extension and get loop count from the next extension.
// We use Chrome's interpretation of the 'loop_count' semantics:
// if not present -> loop once
// if present and loop_count == 0, return 0 ('infinite').
// if present and loop_count != 0, it's the number of *extra* loops
// so we need to return loop_count + 1 as total loop number.
static uint32_t GetLoopCountGIF(const GifFileType* const gif) {
int i;
for (i = 0; i < gif->ImageCount; ++i) {
const SavedImage* const image = &gif->SavedImages[i];
int j;
for (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 = (const char*)eb1->Bytes;
const int 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) {
const uint32_t extra_loop = ((uint32_t)(eb2->Bytes[2]) << 8) +
((uint32_t)(eb2->Bytes[1]) << 0);
return (extra_loop > 0) ? extra_loop + 1 : 0;
}
}
}
return 1; // Default.
}
// Get duration of 'n'th frame in milliseconds.
static int GetFrameDurationGIF(GifFileType* gif, int n) {
GraphicsControlBlock gcb;
memset(&gcb, 0, sizeof(gcb));
DGifSavedExtensionToGCB(gif, n, &gcb);
return gcb.DelayTime * 10;
}
// Returns true if frame 'target' completely covers 'covered'.
static int CoversFrameGIF(const GifImageDesc* const target,
const GifImageDesc* const 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 int 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;
const uint8_t* in;
uint8_t* out;
int j;
if (image_desc->ColorMap) cmap = image_desc->ColorMap;
if (cmap == NULL || cmap->ColorCount != (1 << cmap->BitsPerPixel)) {
fprintf(stderr, "Potentially corrupt color map.\n");
return 0;
}
in = (const uint8_t*)gif_image->RasterBits;
out = dst + image_desc->Top * out_stride + image_desc->Left * kNumChannels;
for (j = 0; j < image_desc->Height; ++j) {
RemapPixelsGIF(in, cmap, transparent_color, image_desc->Width, out);
in += image_desc->Width;
out += out_stride;
}
return 1;
}
// Read animated GIF bitstream from 'filename' into 'AnimatedImage' struct.
static int ReadAnimatedGIF(const char filename[], AnimatedImage* const image,
int dump_frames, const char dump_folder[]) {
uint32_t frame_count;
uint32_t canvas_width, canvas_height;
uint32_t i;
int gif_error;
GifFileType* gif;
gif = DGifOpenFileUnicode((const W_CHAR*)filename, NULL);
if (gif == NULL) {
WFPRINTF(stderr, "Could not read file: %s.\n", (const W_CHAR*)filename);
return 0;
}
gif_error = DGifSlurp(gif);
if (gif_error != GIF_OK) {
WFPRINTF(stderr, "Could not parse image: %s.\n", (const W_CHAR*)filename);
GIFDisplayError(gif, gif_error);
DGifCloseFile(gif, NULL);
return 0;
}
// Animation properties.
image->canvas_width = (uint32_t)gif->SWidth;
image->canvas_height = (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 0;
}
image->loop_count = GetLoopCountGIF(gif);
image->bgcolor = GetBackgroundColorGIF(gif);
frame_count = (uint32_t)gif->ImageCount;
if (frame_count == 0) {
DGifCloseFile(gif, NULL);
return 0;
}
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 0;
}
}
// Allocate frames.
if (!AllocateFrames(image, frame_count)) {
DGifCloseFile(gif, NULL);
return 0;
}
canvas_width = image->canvas_width;
canvas_height = image->canvas_height;
// Decode and reconstruct frames.
for (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;
DecodedFrame* curr_frame;
uint8_t* curr_rgba;
memset(&curr_gcb, 0, sizeof(curr_gcb));
DGifSavedExtensionToGCB(gif, i, &curr_gcb);
curr_frame = &image->frames[i];
curr_rgba = curr_frame->rgba;
curr_frame->duration = GetFrameDurationGIF(gif, i);
// Force frames with a small or no duration to 100ms to be consistent
// with web browsers and other transcoding tools (like gif2webp itself).
if (curr_frame->duration <= 10) curr_frame->duration = 100;
if (i == 0) { // Initialize as transparent.
curr_frame->is_key_frame = 1;
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
} else {
DecodedFrame* const prev_frame = &image->frames[i - 1];
const GifImageDesc* const prev_desc = &gif->SavedImages[i - 1].ImageDesc;
GraphicsControlBlock prev_gcb;
memset(&prev_gcb, 0, sizeof(prev_gcb));
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 {
int prev_frame_disposed, curr_frame_opaque;
int prev_frame_completely_covered;
// Initialize with previous canvas.
uint8_t* const prev_rgba = image->frames[i - 1].rgba;
CopyCanvas(prev_rgba, curr_rgba, canvas_width, canvas_height);
// Dispose previous frame rectangle.
prev_frame_disposed =
(prev_gcb.DisposalMode == DISPOSE_BACKGROUND ||
prev_gcb.DisposalMode == DISPOSE_PREVIOUS);
curr_frame_opaque =
(curr_gcb.TransparentColor == NO_TRANSPARENT_COLOR);
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;
memset(&src_frame_gcb, 0, sizeof(src_frame_gcb));
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;
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 0;
}
if (dump_frames) {
if (!DumpFrame(filename, dump_folder, i, curr_rgba,
canvas_width, canvas_height)) {
DGifCloseFile(gif, NULL);
return 0;
}
}
}
image->format = ANIM_GIF;
DGifCloseFile(gif, NULL);
return 1;
}
#else
static int IsGIF(const WebPData* const data) {
(void)data;
return 0;
}
static int ReadAnimatedGIF(const char filename[], AnimatedImage* const image,
int 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 0;
}
#endif // WEBP_HAVE_GIF
// -----------------------------------------------------------------------------
int ReadAnimatedImage(const char filename[], AnimatedImage* const image,
int dump_frames, const char dump_folder[]) {
int ok = 0;
WebPData webp_data;
WebPDataInit(&webp_data);
memset(image, 0, sizeof(*image));
if (!ImgIoUtilReadFile(filename, &webp_data.bytes, &webp_data.size)) {
WFPRINTF(stderr, "Error reading file: %s\n", (const W_CHAR*)filename);
return 0;
}
if (IsWebP(&webp_data)) {
ok = ReadAnimatedWebP(filename, &webp_data, image, dump_frames,
dump_folder);
} else if (IsGIF(&webp_data)) {
ok = ReadAnimatedGIF(filename, image, dump_frames, dump_folder);
} else {
WFPRINTF(stderr,
"Unknown file type: %s. Supported file types are WebP and GIF\n",
(const W_CHAR*)filename);
ok = 0;
}
if (!ok) ClearAnimatedImage(image);
WebPDataClear(&webp_data);
return ok;
}
static void Accumulate(double v1, double v2, double* const max_diff,
double* const sse) {
const double diff = fabs(v1 - v2);
if (diff > *max_diff) *max_diff = diff;
*sse += diff * diff;
}
void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
uint32_t width, uint32_t height, int premultiply,
int* const max_diff, double* const psnr) {
const uint32_t stride = width * kNumChannels;
const int kAlphaChannel = kNumChannels - 1;
double f_max_diff = 0.;
double sse = 0.;
uint32_t x, y;
for (y = 0; y < height; ++y) {
for (x = 0; x < stride; x += kNumChannels) {
int k;
const size_t offset = (size_t)y * stride + x;
const int alpha1 = rgba1[offset + kAlphaChannel];
const int alpha2 = rgba2[offset + kAlphaChannel];
Accumulate(alpha1, alpha2, &f_max_diff, &sse);
if (!premultiply) {
for (k = 0; k < kAlphaChannel; ++k) {
Accumulate(rgba1[offset + k], rgba2[offset + k], &f_max_diff, &sse);
}
} else {
// premultiply R/G/B channels with alpha value
for (k = 0; k < kAlphaChannel; ++k) {
Accumulate(rgba1[offset + k] * alpha1 / 255.,
rgba2[offset + k] * alpha2 / 255.,
&f_max_diff, &sse);
}
}
}
}
*max_diff = (int)f_max_diff;
if (*max_diff == 0) {
*psnr = 99.; // PSNR when images are identical.
} else {
sse /= stride * height;
*psnr = 4.3429448 * log(255. * 255. / sse);
}
}
void GetAnimatedImageVersions(int* const decoder_version,
int* const demux_version) {
*decoder_version = WebPGetDecoderVersion();
*demux_version = WebPGetDemuxVersion();
}

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// 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 "webp/types.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
ANIM_GIF,
ANIM_WEBP
} AnimatedFileFormat;
typedef struct {
uint8_t* rgba; // Decoded and reconstructed full frame.
int duration; // Frame duration in milliseconds.
int is_key_frame; // True if this frame is a key-frame.
} DecodedFrame;
typedef struct {
AnimatedFileFormat format;
uint32_t canvas_width;
uint32_t canvas_height;
uint32_t bgcolor;
uint32_t loop_count;
DecodedFrame* frames;
uint32_t num_frames;
void* raw_mem;
} AnimatedImage;
// Deallocate everything in 'image' (but not the object itself).
void ClearAnimatedImage(AnimatedImage* const image);
// Read animated image file into 'AnimatedImage' struct.
// If 'dump_frames' is true, dump frames to 'dump_folder'.
// Previous content of 'image' is obliterated.
// Upon successful return, content of 'image' must be deleted by
// calling 'ClearAnimatedImage'.
int ReadAnimatedImage(const char filename[], AnimatedImage* const image,
int dump_frames, const char dump_folder[]);
// Given two RGBA buffers, calculate max pixel difference and PSNR.
// If 'premultiply' is true, R/G/B values will be pre-multiplied by the
// transparency before comparison.
void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
uint32_t width, uint32_t height, int premultiply,
int* const max_diff, double* const psnr);
// Return library versions used by anim_util.
void GetAnimatedImageVersions(int* const decoder_version,
int* const demux_version);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_EXAMPLES_ANIM_UTIL_H_

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// Copyright 2010 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.
// -----------------------------------------------------------------------------
//
// Command-line tool for decoding a WebP image.
//
// Author: Skal (pascal.massimino@gmail.com)
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#include "../examples/example_util.h"
#include "../imageio/image_enc.h"
#include "../imageio/webpdec.h"
#include "./stopwatch.h"
#include "./unicode.h"
static int verbose = 0;
static int quiet = 0;
#ifndef WEBP_DLL
#ifdef __cplusplus
extern "C" {
#endif
extern void* VP8GetCPUInfo; // opaque forward declaration.
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_DLL
static int SaveOutput(const WebPDecBuffer* const buffer,
WebPOutputFileFormat format, const char* const out_file) {
const int use_stdout = (out_file != NULL) && !WSTRCMP(out_file, "-");
int ok = 1;
Stopwatch stop_watch;
if (verbose) {
StopwatchReset(&stop_watch);
}
ok = WebPSaveImage(buffer, format, out_file);
if (ok) {
if (!quiet) {
if (use_stdout) {
fprintf(stderr, "Saved to stdout\n");
} else {
WFPRINTF(stderr, "Saved file %s\n", (const W_CHAR*)out_file);
}
}
if (verbose) {
const double write_time = StopwatchReadAndReset(&stop_watch);
fprintf(stderr, "Time to write output: %.3fs\n", write_time);
}
} else {
if (use_stdout) {
fprintf(stderr, "Error writing to stdout !!\n");
} else {
WFPRINTF(stderr, "Error writing file %s !!\n", (const W_CHAR*)out_file);
}
}
return ok;
}
static void Help(void) {
printf("Usage: dwebp in_file [options] [-o out_file]\n\n"
"Decodes the WebP image file to PNG format [Default].\n"
"Note: Animated WebP files are not supported.\n\n"
"Use following options to convert into alternate image formats:\n"
" -pam ......... save the raw RGBA samples as a color PAM\n"
" -ppm ......... save the raw RGB samples as a color PPM\n"
" -bmp ......... save as uncompressed BMP format\n"
" -tiff ........ save as uncompressed TIFF format\n"
" -pgm ......... save the raw YUV samples as a grayscale PGM\n"
" file with IMC4 layout\n"
" -yuv ......... save the raw YUV samples in flat layout\n"
"\n"
" Other options are:\n"
" -version ..... print version number and exit\n"
" -nofancy ..... don't use the fancy YUV420 upscaler\n"
" -nofilter .... disable in-loop filtering\n"
" -nodither .... disable dithering\n"
" -dither <d> .. dithering strength (in 0..100)\n"
" -alpha_dither use alpha-plane dithering if needed\n"
" -mt .......... use multi-threading\n"
" -crop <x> <y> <w> <h> ... crop output with the given rectangle\n"
" -resize <w> <h> ......... resize output (*after* any cropping)\n"
" -flip ........ flip the output vertically\n"
" -alpha ....... only save the alpha plane\n"
" -incremental . use incremental decoding (useful for tests)\n"
" -h ........... this help message\n"
" -v ........... verbose (e.g. print encoding/decoding times)\n"
" -quiet ....... quiet mode, don't print anything\n"
#ifndef WEBP_DLL
" -noasm ....... disable all assembly optimizations\n"
#endif
);
}
static const char* const kFormatType[] = {
"unspecified", "lossy", "lossless"
};
static uint8_t* AllocateExternalBuffer(WebPDecoderConfig* config,
WebPOutputFileFormat format,
int use_external_memory) {
uint8_t* external_buffer = NULL;
WebPDecBuffer* const output_buffer = &config->output;
int w = config->input.width;
int h = config->input.height;
if (config->options.use_scaling) {
w = config->options.scaled_width;
h = config->options.scaled_height;
} else if (config->options.use_cropping) {
w = config->options.crop_width;
h = config->options.crop_height;
}
if (format >= RGB && format <= rgbA_4444) {
const int bpp = (format == RGB || format == BGR) ? 3
: (format == RGBA_4444 || format == rgbA_4444 ||
format == RGB_565) ? 2
: 4;
uint32_t stride = bpp * w + 7; // <- just for exercising
external_buffer = (uint8_t*)WebPMalloc(stride * h);
if (external_buffer == NULL) return NULL;
output_buffer->u.RGBA.stride = stride;
output_buffer->u.RGBA.size = stride * h;
output_buffer->u.RGBA.rgba = external_buffer;
} else { // YUV and YUVA
const int has_alpha = WebPIsAlphaMode(output_buffer->colorspace);
uint8_t* tmp;
uint32_t stride = w + 3;
uint32_t uv_stride = (w + 1) / 2 + 13;
uint32_t total_size = stride * h * (has_alpha ? 2 : 1)
+ 2 * uv_stride * (h + 1) / 2;
assert(format >= YUV && format <= YUVA);
external_buffer = (uint8_t*)WebPMalloc(total_size);
if (external_buffer == NULL) return NULL;
tmp = external_buffer;
output_buffer->u.YUVA.y = tmp;
output_buffer->u.YUVA.y_stride = stride;
output_buffer->u.YUVA.y_size = stride * h;
tmp += output_buffer->u.YUVA.y_size;
if (has_alpha) {
output_buffer->u.YUVA.a = tmp;
output_buffer->u.YUVA.a_stride = stride;
output_buffer->u.YUVA.a_size = stride * h;
tmp += output_buffer->u.YUVA.a_size;
} else {
output_buffer->u.YUVA.a = NULL;
output_buffer->u.YUVA.a_stride = 0;
}
output_buffer->u.YUVA.u = tmp;
output_buffer->u.YUVA.u_stride = uv_stride;
output_buffer->u.YUVA.u_size = uv_stride * (h + 1) / 2;
tmp += output_buffer->u.YUVA.u_size;
output_buffer->u.YUVA.v = tmp;
output_buffer->u.YUVA.v_stride = uv_stride;
output_buffer->u.YUVA.v_size = uv_stride * (h + 1) / 2;
tmp += output_buffer->u.YUVA.v_size;
assert(tmp <= external_buffer + total_size);
}
output_buffer->is_external_memory = use_external_memory;
return external_buffer;
}
int main(int argc, const char* argv[]) {
int ok = 0;
const char* in_file = NULL;
const char* out_file = NULL;
WebPDecoderConfig config;
WebPDecBuffer* const output_buffer = &config.output;
WebPBitstreamFeatures* const bitstream = &config.input;
WebPOutputFileFormat format = PNG;
uint8_t* external_buffer = NULL;
int use_external_memory = 0;
const uint8_t* data = NULL;
int incremental = 0;
int c;
INIT_WARGV(argc, argv);
if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Library version mismatch!\n");
FREE_WARGV_AND_RETURN(-1);
}
for (c = 1; c < argc; ++c) {
int parse_error = 0;
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
out_file = (const char*)GET_WARGV(argv, ++c);
} else if (!strcmp(argv[c], "-alpha")) {
format = ALPHA_PLANE_ONLY;
} else if (!strcmp(argv[c], "-nofancy")) {
config.options.no_fancy_upsampling = 1;
} else if (!strcmp(argv[c], "-nofilter")) {
config.options.bypass_filtering = 1;
} else if (!strcmp(argv[c], "-pam")) {
format = PAM;
} else if (!strcmp(argv[c], "-ppm")) {
format = PPM;
} else if (!strcmp(argv[c], "-bmp")) {
format = BMP;
} else if (!strcmp(argv[c], "-tiff")) {
format = TIFF;
} else if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
} else if (!strcmp(argv[c], "-version")) {
const int version = WebPGetDecoderVersion();
printf("%d.%d.%d\n",
(version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-pgm")) {
format = PGM;
} else if (!strcmp(argv[c], "-yuv")) {
format = RAW_YUV;
} else if (!strcmp(argv[c], "-pixel_format") && c < argc - 1) {
const char* const fmt = argv[++c];
if (!strcmp(fmt, "RGB")) format = RGB;
else if (!strcmp(fmt, "RGBA")) format = RGBA;
else if (!strcmp(fmt, "BGR")) format = BGR;
else if (!strcmp(fmt, "BGRA")) format = BGRA;
else if (!strcmp(fmt, "ARGB")) format = ARGB;
else if (!strcmp(fmt, "RGBA_4444")) format = RGBA_4444;
else if (!strcmp(fmt, "RGB_565")) format = RGB_565;
else if (!strcmp(fmt, "rgbA")) format = rgbA;
else if (!strcmp(fmt, "bgrA")) format = bgrA;
else if (!strcmp(fmt, "Argb")) format = Argb;
else if (!strcmp(fmt, "rgbA_4444")) format = rgbA_4444;
else if (!strcmp(fmt, "YUV")) format = YUV;
else if (!strcmp(fmt, "YUVA")) format = YUVA;
else {
fprintf(stderr, "Can't parse pixel_format %s\n", fmt);
parse_error = 1;
}
} else if (!strcmp(argv[c], "-external_memory") && c < argc - 1) {
use_external_memory = ExUtilGetInt(argv[++c], 0, &parse_error);
parse_error |= (use_external_memory > 2 || use_external_memory < 0);
if (parse_error) {
fprintf(stderr, "Can't parse 'external_memory' value %s\n", argv[c]);
}
} else if (!strcmp(argv[c], "-mt")) {
config.options.use_threads = 1;
} else if (!strcmp(argv[c], "-alpha_dither")) {
config.options.alpha_dithering_strength = 100;
} else if (!strcmp(argv[c], "-nodither")) {
config.options.dithering_strength = 0;
} else if (!strcmp(argv[c], "-dither") && c < argc - 1) {
config.options.dithering_strength =
ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-crop") && c < argc - 4) {
config.options.use_cropping = 1;
config.options.crop_left = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.crop_top = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.crop_width = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.crop_height = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if ((!strcmp(argv[c], "-scale") || !strcmp(argv[c], "-resize")) &&
c < argc - 2) { // '-scale' is left for compatibility
config.options.use_scaling = 1;
config.options.scaled_width = ExUtilGetInt(argv[++c], 0, &parse_error);
config.options.scaled_height = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-flip")) {
config.options.flip = 1;
} else if (!strcmp(argv[c], "-v")) {
verbose = 1;
#ifndef WEBP_DLL
} else if (!strcmp(argv[c], "-noasm")) {
VP8GetCPUInfo = NULL;
#endif
} else if (!strcmp(argv[c], "-incremental")) {
incremental = 1;
} else if (!strcmp(argv[c], "--")) {
if (c < argc - 1) in_file = (const char*)GET_WARGV(argv, ++c);
break;
} else if (argv[c][0] == '-') {
fprintf(stderr, "Unknown option '%s'\n", argv[c]);
Help();
FREE_WARGV_AND_RETURN(-1);
} else {
in_file = (const char*)GET_WARGV(argv, c);
}
if (parse_error) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
}
if (in_file == NULL) {
fprintf(stderr, "missing input file!!\n");
Help();
FREE_WARGV_AND_RETURN(-1);
}
if (quiet) verbose = 0;
{
VP8StatusCode status = VP8_STATUS_OK;
size_t data_size = 0;
if (!LoadWebP(in_file, &data, &data_size, bitstream)) {
FREE_WARGV_AND_RETURN(-1);
}
switch (format) {
case PNG:
#ifdef HAVE_WINCODEC_H
output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR;
#else
output_buffer->colorspace = bitstream->has_alpha ? MODE_RGBA : MODE_RGB;
#endif
break;
case PAM:
output_buffer->colorspace = MODE_RGBA;
break;
case PPM:
output_buffer->colorspace = MODE_RGB; // drops alpha for PPM
break;
case BMP:
output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR;
break;
case TIFF:
output_buffer->colorspace = bitstream->has_alpha ? MODE_RGBA : MODE_RGB;
break;
case PGM:
case RAW_YUV:
output_buffer->colorspace = bitstream->has_alpha ? MODE_YUVA : MODE_YUV;
break;
case ALPHA_PLANE_ONLY:
output_buffer->colorspace = MODE_YUVA;
break;
// forced modes:
case RGB: output_buffer->colorspace = MODE_RGB; break;
case RGBA: output_buffer->colorspace = MODE_RGBA; break;
case BGR: output_buffer->colorspace = MODE_BGR; break;
case BGRA: output_buffer->colorspace = MODE_BGRA; break;
case ARGB: output_buffer->colorspace = MODE_ARGB; break;
case RGBA_4444: output_buffer->colorspace = MODE_RGBA_4444; break;
case RGB_565: output_buffer->colorspace = MODE_RGB_565; break;
case rgbA: output_buffer->colorspace = MODE_rgbA; break;
case bgrA: output_buffer->colorspace = MODE_bgrA; break;
case Argb: output_buffer->colorspace = MODE_Argb; break;
case rgbA_4444: output_buffer->colorspace = MODE_rgbA_4444; break;
case YUV: output_buffer->colorspace = MODE_YUV; break;
case YUVA: output_buffer->colorspace = MODE_YUVA; break;
default: goto Exit;
}
if (use_external_memory > 0 && format >= RGB) {
external_buffer = AllocateExternalBuffer(&config, format,
use_external_memory);
if (external_buffer == NULL) goto Exit;
}
{
Stopwatch stop_watch;
if (verbose) StopwatchReset(&stop_watch);
if (incremental) {
status = DecodeWebPIncremental(data, data_size, &config);
} else {
status = DecodeWebP(data, data_size, &config);
}
if (verbose) {
const double decode_time = StopwatchReadAndReset(&stop_watch);
fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time);
}
}
ok = (status == VP8_STATUS_OK);
if (!ok) {
PrintWebPError(in_file, status);
goto Exit;
}
}
if (out_file != NULL) {
if (!quiet) {
WFPRINTF(stderr, "Decoded %s.", (const W_CHAR*)in_file);
fprintf(stderr, " Dimensions: %d x %d %s. Format: %s. Now saving...\n",
output_buffer->width, output_buffer->height,
bitstream->has_alpha ? " (with alpha)" : "",
kFormatType[bitstream->format]);
}
ok = SaveOutput(output_buffer, format, out_file);
} else {
if (!quiet) {
WFPRINTF(stderr, "File %s can be decoded ", (const W_CHAR*)in_file);
fprintf(stderr, "(dimensions: %d x %d %s. Format: %s).\n",
output_buffer->width, output_buffer->height,
bitstream->has_alpha ? " (with alpha)" : "",
kFormatType[bitstream->format]);
fprintf(stderr, "Nothing written; "
"use -o flag to save the result as e.g. PNG.\n");
}
}
Exit:
WebPFreeDecBuffer(output_buffer);
WebPFree((void*)external_buffer);
WebPFree((void*)data);
FREE_WARGV_AND_RETURN(ok ? 0 : -1);
}
//------------------------------------------------------------------------------

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// Copyright 2012 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.
// -----------------------------------------------------------------------------
//
// Utility functions used by the example programs.
//
#include "./example_util.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "webp/mux_types.h"
#include "../imageio/imageio_util.h"
//------------------------------------------------------------------------------
// String parsing
uint32_t ExUtilGetUInt(const char* const v, int base, int* const error) {
char* end = NULL;
const uint32_t n = (v != NULL) ? (uint32_t)strtoul(v, &end, base) : 0u;
if (end == v && error != NULL && !*error) {
*error = 1;
fprintf(stderr, "Error! '%s' is not an integer.\n",
(v != NULL) ? v : "(null)");
}
return n;
}
int ExUtilGetInt(const char* const v, int base, int* const error) {
return (int)ExUtilGetUInt(v, base, error);
}
int ExUtilGetInts(const char* v, int base, int max_output, int output[]) {
int n, error = 0;
for (n = 0; v != NULL && n < max_output; ++n) {
const int value = ExUtilGetInt(v, base, &error);
if (error) return -1;
output[n] = value;
v = strchr(v, ',');
if (v != NULL) ++v; // skip over the trailing ','
}
return n;
}
float ExUtilGetFloat(const char* const v, int* const error) {
char* end = NULL;
const float f = (v != NULL) ? (float)strtod(v, &end) : 0.f;
if (end == v && error != NULL && !*error) {
*error = 1;
fprintf(stderr, "Error! '%s' is not a floating point number.\n",
(v != NULL) ? v : "(null)");
}
return f;
}
//------------------------------------------------------------------------------
static void ResetCommandLineArguments(int argc, const char* argv[],
CommandLineArguments* const args) {
assert(args != NULL);
args->argc_ = argc;
args->argv_ = argv;
args->own_argv_ = 0;
WebPDataInit(&args->argv_data_);
}
void ExUtilDeleteCommandLineArguments(CommandLineArguments* const args) {
if (args != NULL) {
if (args->own_argv_) {
WebPFree((void*)args->argv_);
WebPDataClear(&args->argv_data_);
}
ResetCommandLineArguments(0, NULL, args);
}
}
#define MAX_ARGC 16384
int ExUtilInitCommandLineArguments(int argc, const char* argv[],
CommandLineArguments* const args) {
if (args == NULL || argv == NULL) return 0;
ResetCommandLineArguments(argc, argv, args);
if (argc == 1 && argv[0][0] != '-') {
char* cur;
const char sep[] = " \t\r\n\f\v";
#if defined(_WIN32) && defined(_UNICODE)
fprintf(stderr,
"Error: Reading arguments from a file is a feature unavailable "
"with Unicode binaries.\n");
return 0;
#endif
if (!ExUtilReadFileToWebPData(argv[0], &args->argv_data_)) {
return 0;
}
args->own_argv_ = 1;
args->argv_ = (const char**)WebPMalloc(MAX_ARGC * sizeof(*args->argv_));
if (args->argv_ == NULL) {
ExUtilDeleteCommandLineArguments(args);
return 0;
}
argc = 0;
for (cur = strtok((char*)args->argv_data_.bytes, sep);
cur != NULL;
cur = strtok(NULL, sep)) {
if (argc == MAX_ARGC) {
fprintf(stderr, "ERROR: Arguments limit %d reached\n", MAX_ARGC);
ExUtilDeleteCommandLineArguments(args);
return 0;
}
assert(strlen(cur) != 0);
args->argv_[argc++] = cur;
}
args->argc_ = argc;
}
return 1;
}
//------------------------------------------------------------------------------
int ExUtilReadFileToWebPData(const char* const filename,
WebPData* const webp_data) {
const uint8_t* data;
size_t size;
if (webp_data == NULL) return 0;
if (!ImgIoUtilReadFile(filename, &data, &size)) return 0;
webp_data->bytes = data;
webp_data->size = size;
return 1;
}

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// Copyright 2012 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.
// -----------------------------------------------------------------------------
//
// Utility functions used by the example programs.
//
#ifndef WEBP_EXAMPLES_EXAMPLE_UTIL_H_
#define WEBP_EXAMPLES_EXAMPLE_UTIL_H_
#include "webp/types.h"
#include "webp/mux_types.h"
#ifdef __cplusplus
extern "C" {
#endif
//------------------------------------------------------------------------------
// String parsing
// Parses 'v' using strto(ul|l|d)(). If error is non-NULL, '*error' is set to
// true on failure while on success it is left unmodified to allow chaining of
// calls. An error is only printed on the first occurrence.
uint32_t ExUtilGetUInt(const char* const v, int base, int* const error);
int ExUtilGetInt(const char* const v, int base, int* const error);
float ExUtilGetFloat(const char* const v, int* const error);
// This variant of ExUtilGetInt() will parse multiple integers from a
// comma-separated list. Up to 'max_output' integers are parsed.
// The result is placed in the output[] array, and the number of integers
// actually parsed is returned, or -1 if an error occurred.
int ExUtilGetInts(const char* v, int base, int max_output, int output[]);
// Reads a file named 'filename' into a WebPData structure. The content of
// webp_data is overwritten. Returns false in case of error.
int ExUtilReadFileToWebPData(const char* const filename,
WebPData* const webp_data);
//------------------------------------------------------------------------------
// Command-line arguments
typedef struct {
int argc_;
const char** argv_;
WebPData argv_data_;
int own_argv_;
} CommandLineArguments;
// Initializes the structure from the command-line parameters. If there is
// only one parameter and it does not start with a '-', then it is assumed to
// be a file name. This file will be read and tokenized into command-line
// arguments. The content of 'args' is overwritten.
// Returns false in case of error (memory allocation failure, non
// existing file, too many arguments, ...).
int ExUtilInitCommandLineArguments(int argc, const char* argv[],
CommandLineArguments* const args);
// Deallocate all memory and reset 'args'.
void ExUtilDeleteCommandLineArguments(CommandLineArguments* const args);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_EXAMPLES_EXAMPLE_UTIL_H_

609
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@@ -0,0 +1,609 @@
// Copyright 2012 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.
// -----------------------------------------------------------------------------
//
// simple tool to convert animated GIFs to WebP
//
// Authors: Skal (pascal.massimino@gmail.com)
// Urvang (urvang@google.com)
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#ifdef WEBP_HAVE_GIF
#if defined(HAVE_UNISTD_H) && HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gif_lib.h>
#include "webp/encode.h"
#include "webp/mux.h"
#include "../examples/example_util.h"
#include "../imageio/imageio_util.h"
#include "./gifdec.h"
#include "./unicode.h"
#include "./unicode_gif.h"
#if !defined(STDIN_FILENO)
#define STDIN_FILENO 0
#endif
//------------------------------------------------------------------------------
static int transparent_index = GIF_INDEX_INVALID; // Opaque by default.
static const char* const kErrorMessages[-WEBP_MUX_NOT_ENOUGH_DATA + 1] = {
"WEBP_MUX_NOT_FOUND", "WEBP_MUX_INVALID_ARGUMENT", "WEBP_MUX_BAD_DATA",
"WEBP_MUX_MEMORY_ERROR", "WEBP_MUX_NOT_ENOUGH_DATA"
};
static const char* ErrorString(WebPMuxError err) {
assert(err <= WEBP_MUX_NOT_FOUND && err >= WEBP_MUX_NOT_ENOUGH_DATA);
return kErrorMessages[-err];
}
enum {
METADATA_ICC = (1 << 0),
METADATA_XMP = (1 << 1),
METADATA_ALL = METADATA_ICC | METADATA_XMP
};
//------------------------------------------------------------------------------
static void Help(void) {
printf("Usage:\n");
printf(" gif2webp [options] gif_file -o webp_file\n");
printf("Options:\n");
printf(" -h / -help ............. this help\n");
printf(" -lossy ................. encode image using lossy compression\n");
printf(" -mixed ................. for each frame in the image, pick lossy\n"
" or lossless compression heuristically\n");
printf(" -q <float> ............. quality factor (0:small..100:big)\n");
printf(" -m <int> ............... compression method (0=fast, 6=slowest)\n");
printf(" -min_size .............. minimize output size (default:off)\n"
" lossless compression by default; can be\n"
" combined with -q, -m, -lossy or -mixed\n"
" options\n");
printf(" -kmin <int> ............ min distance between key frames\n");
printf(" -kmax <int> ............ max distance between key frames\n");
printf(" -f <int> ............... filter strength (0=off..100)\n");
printf(" -metadata <string> ..... comma separated list of metadata to\n");
printf(" ");
printf("copy from the input to the output if present\n");
printf(" ");
printf("Valid values: all, none, icc, xmp (default)\n");
printf(" -loop_compatibility .... use compatibility mode for Chrome\n");
printf(" version prior to M62 (inclusive)\n");
printf(" -mt .................... use multi-threading if available\n");
printf("\n");
printf(" -version ............... print version number and exit\n");
printf(" -v ..................... verbose\n");
printf(" -quiet ................. don't print anything\n");
printf("\n");
}
//------------------------------------------------------------------------------
int main(int argc, const char* argv[]) {
int verbose = 0;
int gif_error = GIF_ERROR;
WebPMuxError err = WEBP_MUX_OK;
int ok = 0;
const W_CHAR* in_file = NULL, *out_file = NULL;
GifFileType* gif = NULL;
int frame_duration = 0;
int frame_timestamp = 0;
GIFDisposeMethod orig_dispose = GIF_DISPOSE_NONE;
WebPPicture frame; // Frame rectangle only (not disposed).
WebPPicture curr_canvas; // Not disposed.
WebPPicture prev_canvas; // Disposed.
WebPAnimEncoder* enc = NULL;
WebPAnimEncoderOptions enc_options;
WebPConfig config;
int frame_number = 0; // Whether we are processing the first frame.
int done;
int c;
int quiet = 0;
WebPData webp_data;
int keep_metadata = METADATA_XMP; // ICC not output by default.
WebPData icc_data;
int stored_icc = 0; // Whether we have already stored an ICC profile.
WebPData xmp_data;
int stored_xmp = 0; // Whether we have already stored an XMP profile.
int loop_count = 0; // default: infinite
int stored_loop_count = 0; // Whether we have found an explicit loop count.
int loop_compatibility = 0;
WebPMux* mux = NULL;
int default_kmin = 1; // Whether to use default kmin value.
int default_kmax = 1;
INIT_WARGV(argc, argv);
if (!WebPConfigInit(&config) || !WebPAnimEncoderOptionsInit(&enc_options) ||
!WebPPictureInit(&frame) || !WebPPictureInit(&curr_canvas) ||
!WebPPictureInit(&prev_canvas)) {
fprintf(stderr, "Error! Version mismatch!\n");
FREE_WARGV_AND_RETURN(-1);
}
config.lossless = 1; // Use lossless compression by default.
WebPDataInit(&webp_data);
WebPDataInit(&icc_data);
WebPDataInit(&xmp_data);
if (argc == 1) {
Help();
FREE_WARGV_AND_RETURN(0);
}
for (c = 1; c < argc; ++c) {
int parse_error = 0;
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
out_file = GET_WARGV(argv, ++c);
} else if (!strcmp(argv[c], "-lossy")) {
config.lossless = 0;
} else if (!strcmp(argv[c], "-mixed")) {
enc_options.allow_mixed = 1;
config.lossless = 0;
} else if (!strcmp(argv[c], "-loop_compatibility")) {
loop_compatibility = 1;
} else if (!strcmp(argv[c], "-q") && c < argc - 1) {
config.quality = ExUtilGetFloat(argv[++c], &parse_error);
} else if (!strcmp(argv[c], "-m") && c < argc - 1) {
config.method = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-min_size")) {
enc_options.minimize_size = 1;
} else if (!strcmp(argv[c], "-kmax") && c < argc - 1) {
enc_options.kmax = ExUtilGetInt(argv[++c], 0, &parse_error);
default_kmax = 0;
} else if (!strcmp(argv[c], "-kmin") && c < argc - 1) {
enc_options.kmin = ExUtilGetInt(argv[++c], 0, &parse_error);
default_kmin = 0;
} else if (!strcmp(argv[c], "-f") && c < argc - 1) {
config.filter_strength = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-metadata") && c < argc - 1) {
static const struct {
const char* option;
int flag;
} kTokens[] = {
{ "all", METADATA_ALL },
{ "none", 0 },
{ "icc", METADATA_ICC },
{ "xmp", METADATA_XMP },
};
const size_t kNumTokens = sizeof(kTokens) / sizeof(*kTokens);
const char* start = argv[++c];
const char* const end = start + strlen(start);
keep_metadata = 0;
while (start < end) {
size_t i;
const char* token = strchr(start, ',');
if (token == NULL) token = end;
for (i = 0; i < kNumTokens; ++i) {
if ((size_t)(token - start) == strlen(kTokens[i].option) &&
!strncmp(start, kTokens[i].option, strlen(kTokens[i].option))) {
if (kTokens[i].flag != 0) {
keep_metadata |= kTokens[i].flag;
} else {
keep_metadata = 0;
}
break;
}
}
if (i == kNumTokens) {
fprintf(stderr, "Error! Unknown metadata type '%.*s'\n",
(int)(token - start), start);
Help();
FREE_WARGV_AND_RETURN(-1);
}
start = token + 1;
}
} else if (!strcmp(argv[c], "-mt")) {
++config.thread_level;
} else if (!strcmp(argv[c], "-version")) {
const int enc_version = WebPGetEncoderVersion();
const int mux_version = WebPGetMuxVersion();
printf("WebP Encoder version: %d.%d.%d\nWebP Mux version: %d.%d.%d\n",
(enc_version >> 16) & 0xff, (enc_version >> 8) & 0xff,
enc_version & 0xff, (mux_version >> 16) & 0xff,
(mux_version >> 8) & 0xff, mux_version & 0xff);
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
enc_options.verbose = 0;
} else if (!strcmp(argv[c], "-v")) {
verbose = 1;
enc_options.verbose = 1;
} else if (!strcmp(argv[c], "--")) {
if (c < argc - 1) in_file = GET_WARGV(argv, ++c);
break;
} else if (argv[c][0] == '-') {
fprintf(stderr, "Error! Unknown option '%s'\n", argv[c]);
Help();
FREE_WARGV_AND_RETURN(-1);
} else {
in_file = GET_WARGV(argv, c);
}
if (parse_error) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
}
// Appropriate default kmin, kmax values for lossy and lossless.
if (default_kmin) {
enc_options.kmin = config.lossless ? 9 : 3;
}
if (default_kmax) {
enc_options.kmax = config.lossless ? 17 : 5;
}
if (!WebPValidateConfig(&config)) {
fprintf(stderr, "Error! Invalid configuration.\n");
goto End;
}
if (in_file == NULL) {
fprintf(stderr, "No input file specified!\n");
Help();
goto End;
}
// Start the decoder object
gif = DGifOpenFileUnicode(in_file, &gif_error);
if (gif == NULL) goto End;
// Loop over GIF images
done = 0;
do {
GifRecordType type;
if (DGifGetRecordType(gif, &type) == GIF_ERROR) goto End;
switch (type) {
case IMAGE_DESC_RECORD_TYPE: {
GIFFrameRect gif_rect;
GifImageDesc* const image_desc = &gif->Image;
if (!DGifGetImageDesc(gif)) goto End;
if (frame_number == 0) {
if (verbose) {
printf("Canvas screen: %d x %d\n", gif->SWidth, gif->SHeight);
}
// Fix some broken GIF global headers that report
// 0 x 0 screen dimension.
if (gif->SWidth == 0 || gif->SHeight == 0) {
image_desc->Left = 0;
image_desc->Top = 0;
gif->SWidth = image_desc->Width;
gif->SHeight = image_desc->Height;
if (gif->SWidth <= 0 || gif->SHeight <= 0) {
goto End;
}
if (verbose) {
printf("Fixed canvas screen dimension to: %d x %d\n",
gif->SWidth, gif->SHeight);
}
}
// Allocate current buffer.
frame.width = gif->SWidth;
frame.height = gif->SHeight;
frame.use_argb = 1;
if (!WebPPictureAlloc(&frame)) goto End;
GIFClearPic(&frame, NULL);
if (!(WebPPictureCopy(&frame, &curr_canvas) &&
WebPPictureCopy(&frame, &prev_canvas))) {
fprintf(stderr, "Error allocating canvas.\n");
goto End;
}
// Background color.
GIFGetBackgroundColor(gif->SColorMap, gif->SBackGroundColor,
transparent_index,
&enc_options.anim_params.bgcolor);
// Initialize encoder.
enc = WebPAnimEncoderNew(curr_canvas.width, curr_canvas.height,
&enc_options);
if (enc == NULL) {
fprintf(stderr,
"Error! Could not create encoder object. Possibly due to "
"a memory error.\n");
goto End;
}
}
// Some even more broken GIF can have sub-rect with zero width/height.
if (image_desc->Width == 0 || image_desc->Height == 0) {
image_desc->Width = gif->SWidth;
image_desc->Height = gif->SHeight;
}
if (!GIFReadFrame(gif, transparent_index, &gif_rect, &frame)) {
goto End;
}
// Blend frame rectangle with previous canvas to compose full canvas.
// Note that 'curr_canvas' is same as 'prev_canvas' at this point.
GIFBlendFrames(&frame, &gif_rect, &curr_canvas);
if (!WebPAnimEncoderAdd(enc, &curr_canvas, frame_timestamp, &config)) {
fprintf(stderr, "Error while adding frame #%d: %s\n", frame_number,
WebPAnimEncoderGetError(enc));
goto End;
} else {
++frame_number;
}
// Update canvases.
GIFDisposeFrame(orig_dispose, &gif_rect, &prev_canvas, &curr_canvas);
GIFCopyPixels(&curr_canvas, &prev_canvas);
// Force frames with a small or no duration to 100ms to be consistent
// with web browsers and other transcoding tools. This also avoids
// incorrect durations between frames when padding frames are
// discarded.
if (frame_duration <= 10) {
frame_duration = 100;
}
// Update timestamp (for next frame).
frame_timestamp += frame_duration;
// In GIF, graphic control extensions are optional for a frame, so we
// may not get one before reading the next frame. To handle this case,
// we reset frame properties to reasonable defaults for the next frame.
orig_dispose = GIF_DISPOSE_NONE;
frame_duration = 0;
transparent_index = GIF_INDEX_INVALID;
break;
}
case EXTENSION_RECORD_TYPE: {
int extension;
GifByteType* data = NULL;
if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
goto End;
}
if (data == NULL) continue;
switch (extension) {
case COMMENT_EXT_FUNC_CODE: {
break; // Do nothing for now.
}
case GRAPHICS_EXT_FUNC_CODE: {
if (!GIFReadGraphicsExtension(data, &frame_duration, &orig_dispose,
&transparent_index)) {
goto End;
}
break;
}
case PLAINTEXT_EXT_FUNC_CODE: {
break;
}
case APPLICATION_EXT_FUNC_CODE: {
if (data[0] != 11) break; // Chunk is too short
if (!memcmp(data + 1, "NETSCAPE2.0", 11) ||
!memcmp(data + 1, "ANIMEXTS1.0", 11)) {
if (!GIFReadLoopCount(gif, &data, &loop_count)) {
goto End;
}
if (verbose) {
fprintf(stderr, "Loop count: %d\n", loop_count);
}
stored_loop_count = loop_compatibility ? (loop_count != 0) : 1;
} else { // An extension containing metadata.
// We only store the first encountered chunk of each type, and
// only if requested by the user.
const int is_xmp = (keep_metadata & METADATA_XMP) &&
!stored_xmp &&
!memcmp(data + 1, "XMP DataXMP", 11);
const int is_icc = (keep_metadata & METADATA_ICC) &&
!stored_icc &&
!memcmp(data + 1, "ICCRGBG1012", 11);
if (is_xmp || is_icc) {
if (!GIFReadMetadata(gif, &data,
is_xmp ? &xmp_data : &icc_data)) {
goto End;
}
if (is_icc) {
stored_icc = 1;
} else if (is_xmp) {
stored_xmp = 1;
}
}
}
break;
}
default: {
break; // skip
}
}
while (data != NULL) {
if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) goto End;
}
break;
}
case TERMINATE_RECORD_TYPE: {
done = 1;
break;
}
default: {
if (verbose) {
fprintf(stderr, "Skipping over unknown record type %d\n", type);
}
break;
}
}
} while (!done);
// Last NULL frame.
if (!WebPAnimEncoderAdd(enc, NULL, frame_timestamp, NULL)) {
fprintf(stderr, "Error flushing WebP muxer.\n");
fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
}
if (!WebPAnimEncoderAssemble(enc, &webp_data)) {
fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
goto End;
}
// If there's only one frame, we don't need to handle loop count.
if (frame_number == 1) {
loop_count = 0;
} else if (!loop_compatibility) {
if (!stored_loop_count) {
// if no loop-count element is seen, the default is '1' (loop-once)
// and we need to signal it explicitly in WebP. Note however that
// in case there's a single frame, we still don't need to store it.
if (frame_number > 1) {
stored_loop_count = 1;
loop_count = 1;
}
} else if (loop_count > 0 && loop_count < 65535) {
// adapt GIF's semantic to WebP's (except in the infinite-loop case)
loop_count += 1;
}
}
// loop_count of 0 is the default (infinite), so no need to signal it
if (loop_count == 0) stored_loop_count = 0;
if (stored_loop_count || stored_icc || stored_xmp) {
// Re-mux to add loop count and/or metadata as needed.
mux = WebPMuxCreate(&webp_data, 1);
if (mux == NULL) {
fprintf(stderr, "ERROR: Could not re-mux to add loop count/metadata.\n");
goto End;
}
WebPDataClear(&webp_data);
if (stored_loop_count) { // Update loop count.
WebPMuxAnimParams new_params;
err = WebPMuxGetAnimationParams(mux, &new_params);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not fetch loop count.\n",
ErrorString(err));
goto End;
}
new_params.loop_count = loop_count;
err = WebPMuxSetAnimationParams(mux, &new_params);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not update loop count.\n",
ErrorString(err));
goto End;
}
}
if (stored_icc) { // Add ICCP chunk.
err = WebPMuxSetChunk(mux, "ICCP", &icc_data, 1);
if (verbose) {
fprintf(stderr, "ICC size: %d\n", (int)icc_data.size);
}
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not set ICC chunk.\n",
ErrorString(err));
goto End;
}
}
if (stored_xmp) { // Add XMP chunk.
err = WebPMuxSetChunk(mux, "XMP ", &xmp_data, 1);
if (verbose) {
fprintf(stderr, "XMP size: %d\n", (int)xmp_data.size);
}
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not set XMP chunk.\n",
ErrorString(err));
goto End;
}
}
err = WebPMuxAssemble(mux, &webp_data);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not assemble when re-muxing to add "
"loop count/metadata.\n", ErrorString(err));
goto End;
}
}
if (out_file != NULL) {
if (!ImgIoUtilWriteFile((const char*)out_file, webp_data.bytes,
webp_data.size)) {
WFPRINTF(stderr, "Error writing output file: %s\n", out_file);
goto End;
}
if (!quiet) {
if (!WSTRCMP(out_file, "-")) {
fprintf(stderr, "Saved %d bytes to STDIO\n",
(int)webp_data.size);
} else {
WFPRINTF(stderr, "Saved output file (%d bytes): %s\n",
(int)webp_data.size, out_file);
}
}
} else {
if (!quiet) {
fprintf(stderr, "Nothing written; use -o flag to save the result "
"(%d bytes).\n", (int)webp_data.size);
}
}
// All OK.
ok = 1;
gif_error = GIF_OK;
End:
WebPDataClear(&icc_data);
WebPDataClear(&xmp_data);
WebPMuxDelete(mux);
WebPDataClear(&webp_data);
WebPPictureFree(&frame);
WebPPictureFree(&curr_canvas);
WebPPictureFree(&prev_canvas);
WebPAnimEncoderDelete(enc);
if (gif_error != GIF_OK) {
GIFDisplayError(gif, gif_error);
}
if (gif != NULL) {
#if LOCAL_GIF_PREREQ(5,1)
DGifCloseFile(gif, &gif_error);
#else
DGifCloseFile(gif);
#endif
}
FREE_WARGV_AND_RETURN(!ok);
}
#else // !WEBP_HAVE_GIF
int main(int argc, const char* argv[]) {
fprintf(stderr, "GIF support not enabled in %s.\n", argv[0]);
(void)argc;
return 0;
}
#endif
//------------------------------------------------------------------------------

416
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// Copyright 2012 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.
// -----------------------------------------------------------------------------
//
// GIF decode.
#include "./gifdec.h"
#include <stdio.h>
#ifdef WEBP_HAVE_GIF
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "webp/encode.h"
#include "webp/mux_types.h"
#define GIF_TRANSPARENT_COLOR 0x00000000u
#define GIF_WHITE_COLOR 0xffffffffu
#define GIF_TRANSPARENT_MASK 0x01
#define GIF_DISPOSE_MASK 0x07
#define GIF_DISPOSE_SHIFT 2
// from utils/utils.h
#ifdef __cplusplus
extern "C" {
#endif
extern void WebPCopyPlane(const uint8_t* src, int src_stride,
uint8_t* dst, int dst_stride,
int width, int height);
extern void WebPCopyPixels(const WebPPicture* const src,
WebPPicture* const dst);
#ifdef __cplusplus
}
#endif
void GIFGetBackgroundColor(const ColorMapObject* const color_map,
int bgcolor_index, int transparent_index,
uint32_t* const bgcolor) {
if (transparent_index != GIF_INDEX_INVALID &&
bgcolor_index == transparent_index) {
*bgcolor = GIF_TRANSPARENT_COLOR; // Special case.
} else if (color_map == NULL || color_map->Colors == NULL
|| bgcolor_index >= color_map->ColorCount) {
*bgcolor = GIF_WHITE_COLOR;
fprintf(stderr,
"GIF decode warning: invalid background color index. Assuming "
"white background.\n");
} else {
const GifColorType color = color_map->Colors[bgcolor_index];
*bgcolor = (0xffu << 24)
| (color.Red << 16)
| (color.Green << 8)
| (color.Blue << 0);
}
}
int GIFReadGraphicsExtension(const GifByteType* const buf, int* const duration,
GIFDisposeMethod* const dispose,
int* const transparent_index) {
const int flags = buf[1];
const int dispose_raw = (flags >> GIF_DISPOSE_SHIFT) & GIF_DISPOSE_MASK;
const int duration_raw = buf[2] | (buf[3] << 8); // In 10 ms units.
if (buf[0] != 4) return 0;
*duration = duration_raw * 10; // Duration is in 1 ms units.
switch (dispose_raw) {
case 3:
*dispose = GIF_DISPOSE_RESTORE_PREVIOUS;
break;
case 2:
*dispose = GIF_DISPOSE_BACKGROUND;
break;
case 1:
case 0:
default:
*dispose = GIF_DISPOSE_NONE;
break;
}
*transparent_index =
(flags & GIF_TRANSPARENT_MASK) ? buf[4] : GIF_INDEX_INVALID;
return 1;
}
static int Remap(const GifFileType* const gif, const uint8_t* const src,
int len, int transparent_index, uint32_t* dst) {
int i;
const GifColorType* colors;
const ColorMapObject* const cmap =
gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
if (cmap == NULL) return 1;
if (cmap->Colors == NULL || cmap->ColorCount <= 0) return 0;
colors = cmap->Colors;
for (i = 0; i < len; ++i) {
if (src[i] == transparent_index) {
dst[i] = GIF_TRANSPARENT_COLOR;
} else if (src[i] < cmap->ColorCount) {
const GifColorType c = colors[src[i]];
dst[i] = c.Blue | (c.Green << 8) | (c.Red << 16) | (0xffu << 24);
} else {
return 0;
}
}
return 1;
}
int GIFReadFrame(GifFileType* const gif, int transparent_index,
GIFFrameRect* const gif_rect, WebPPicture* const picture) {
WebPPicture sub_image;
const GifImageDesc* const image_desc = &gif->Image;
uint32_t* dst = NULL;
uint8_t* tmp = NULL;
const GIFFrameRect rect = {
image_desc->Left, image_desc->Top, image_desc->Width, image_desc->Height
};
const uint64_t memory_needed = 4 * rect.width * (uint64_t)rect.height;
int ok = 0;
*gif_rect = rect;
if (memory_needed != (size_t)memory_needed || memory_needed > (4ULL << 32)) {
fprintf(stderr, "Image is too large (%d x %d).", rect.width, rect.height);
return 0;
}
// Use a view for the sub-picture:
if (!WebPPictureView(picture, rect.x_offset, rect.y_offset,
rect.width, rect.height, &sub_image)) {
fprintf(stderr, "Sub-image %dx%d at position %d,%d is invalid!\n",
rect.width, rect.height, rect.x_offset, rect.y_offset);
return 0;
}
dst = sub_image.argb;
tmp = (uint8_t*)WebPMalloc(rect.width * sizeof(*tmp));
if (tmp == NULL) goto End;
if (image_desc->Interlace) { // Interlaced image.
// We need 4 passes, with the following offsets and jumps.
const int interlace_offsets[] = { 0, 4, 2, 1 };
const int interlace_jumps[] = { 8, 8, 4, 2 };
int pass;
for (pass = 0; pass < 4; ++pass) {
const size_t stride = (size_t)sub_image.argb_stride;
int y = interlace_offsets[pass];
uint32_t* row = dst + y * stride;
const size_t jump = interlace_jumps[pass] * stride;
for (; y < rect.height; y += interlace_jumps[pass], row += jump) {
if (DGifGetLine(gif, tmp, rect.width) == GIF_ERROR) goto End;
if (!Remap(gif, tmp, rect.width, transparent_index, row)) goto End;
}
}
} else { // Non-interlaced image.
int y;
uint32_t* ptr = dst;
for (y = 0; y < rect.height; ++y, ptr += sub_image.argb_stride) {
if (DGifGetLine(gif, tmp, rect.width) == GIF_ERROR) goto End;
if (!Remap(gif, tmp, rect.width, transparent_index, ptr)) goto End;
}
}
ok = 1;
End:
if (!ok) picture->error_code = sub_image.error_code;
WebPPictureFree(&sub_image);
WebPFree(tmp);
return ok;
}
int GIFReadLoopCount(GifFileType* const gif, GifByteType** const buf,
int* const loop_count) {
assert(!memcmp(*buf + 1, "NETSCAPE2.0", 11) ||
!memcmp(*buf + 1, "ANIMEXTS1.0", 11));
if (DGifGetExtensionNext(gif, buf) == GIF_ERROR) {
return 0;
}
if (*buf == NULL) {
return 0; // Loop count sub-block missing.
}
if ((*buf)[0] < 3 || (*buf)[1] != 1) {
return 0; // wrong size/marker
}
*loop_count = (*buf)[2] | ((*buf)[3] << 8);
return 1;
}
int GIFReadMetadata(GifFileType* const gif, GifByteType** const buf,
WebPData* const metadata) {
const int is_xmp = !memcmp(*buf + 1, "XMP DataXMP", 11);
const int is_icc = !memcmp(*buf + 1, "ICCRGBG1012", 11);
assert(is_xmp || is_icc);
(void)is_icc; // silence unused warning.
// Construct metadata from sub-blocks.
// Usual case (including ICC profile): In each sub-block, the
// first byte specifies its size in bytes (0 to 255) and the
// rest of the bytes contain the data.
// Special case for XMP data: In each sub-block, the first byte
// is also part of the XMP payload. XMP in GIF also has a 257
// byte padding data. See the XMP specification for details.
while (1) {
WebPData subblock;
const uint8_t* tmp;
if (DGifGetExtensionNext(gif, buf) == GIF_ERROR) {
return 0;
}
if (*buf == NULL) break; // Finished.
subblock.size = is_xmp ? (*buf)[0] + 1 : (*buf)[0];
assert(subblock.size > 0);
subblock.bytes = is_xmp ? *buf : *buf + 1;
// Note: We store returned value in 'tmp' first, to avoid
// leaking old memory in metadata->bytes on error.
tmp = (uint8_t*)realloc((void*)metadata->bytes,
metadata->size + subblock.size);
if (tmp == NULL) {
return 0;
}
memcpy((void*)(tmp + metadata->size),
subblock.bytes, subblock.size);
metadata->bytes = tmp;
metadata->size += subblock.size;
}
if (is_xmp) {
// XMP padding data is 0x01, 0xff, 0xfe ... 0x01, 0x00.
const size_t xmp_pading_size = 257;
if (metadata->size > xmp_pading_size) {
metadata->size -= xmp_pading_size;
}
}
return 1;
}
static void ClearRectangle(WebPPicture* const picture,
int left, int top, int width, int height) {
int i, j;
const size_t stride = picture->argb_stride;
uint32_t* dst = picture->argb + top * stride + left;
for (j = 0; j < height; ++j, dst += stride) {
for (i = 0; i < width; ++i) dst[i] = GIF_TRANSPARENT_COLOR;
}
}
void GIFClearPic(WebPPicture* const pic, const GIFFrameRect* const rect) {
if (rect != NULL) {
ClearRectangle(pic, rect->x_offset, rect->y_offset,
rect->width, rect->height);
} else {
ClearRectangle(pic, 0, 0, pic->width, pic->height);
}
}
void GIFCopyPixels(const WebPPicture* const src, WebPPicture* const dst) {
WebPCopyPixels(src, dst);
}
void GIFDisposeFrame(GIFDisposeMethod dispose, const GIFFrameRect* const rect,
const WebPPicture* const prev_canvas,
WebPPicture* const curr_canvas) {
assert(rect != NULL);
if (dispose == GIF_DISPOSE_BACKGROUND) {
GIFClearPic(curr_canvas, rect);
} else if (dispose == GIF_DISPOSE_RESTORE_PREVIOUS) {
const size_t src_stride = prev_canvas->argb_stride;
const uint32_t* const src = prev_canvas->argb + rect->x_offset
+ rect->y_offset * src_stride;
const size_t dst_stride = curr_canvas->argb_stride;
uint32_t* const dst = curr_canvas->argb + rect->x_offset
+ rect->y_offset * dst_stride;
assert(prev_canvas != NULL);
WebPCopyPlane((uint8_t*)src, (int)(4 * src_stride),
(uint8_t*)dst, (int)(4 * dst_stride),
4 * rect->width, rect->height);
}
}
void GIFBlendFrames(const WebPPicture* const src,
const GIFFrameRect* const rect, WebPPicture* const dst) {
int i, j;
const size_t src_stride = src->argb_stride;
const size_t dst_stride = dst->argb_stride;
assert(src->width == dst->width && src->height == dst->height);
for (j = rect->y_offset; j < rect->y_offset + rect->height; ++j) {
for (i = rect->x_offset; i < rect->x_offset + rect->width; ++i) {
const uint32_t src_pixel = src->argb[j * src_stride + i];
const int src_alpha = src_pixel >> 24;
if (src_alpha != 0) {
dst->argb[j * dst_stride + i] = src_pixel;
}
}
}
}
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
}
#else // !WEBP_HAVE_GIF
static void ErrorGIFNotAvailable() {
fprintf(stderr, "GIF support not compiled. Please install the libgif-dev "
"package before building.\n");
}
void GIFGetBackgroundColor(const struct ColorMapObject* const color_map,
int bgcolor_index, int transparent_index,
uint32_t* const bgcolor) {
(void)color_map;
(void)bgcolor_index;
(void)transparent_index;
(void)bgcolor;
ErrorGIFNotAvailable();
}
int GIFReadGraphicsExtension(const GifByteType* const data, int* const duration,
GIFDisposeMethod* const dispose,
int* const transparent_index) {
(void)data;
(void)duration;
(void)dispose;
(void)transparent_index;
ErrorGIFNotAvailable();
return 0;
}
int GIFReadFrame(struct GifFileType* const gif, int transparent_index,
GIFFrameRect* const gif_rect,
struct WebPPicture* const picture) {
(void)gif;
(void)transparent_index;
(void)gif_rect;
(void)picture;
ErrorGIFNotAvailable();
return 0;
}
int GIFReadLoopCount(struct GifFileType* const gif, GifByteType** const buf,
int* const loop_count) {
(void)gif;
(void)buf;
(void)loop_count;
ErrorGIFNotAvailable();
return 0;
}
int GIFReadMetadata(struct GifFileType* const gif, GifByteType** const buf,
struct WebPData* const metadata) {
(void)gif;
(void)buf;
(void)metadata;
ErrorGIFNotAvailable();
return 0;
}
void GIFDisposeFrame(GIFDisposeMethod dispose, const GIFFrameRect* const rect,
const struct WebPPicture* const prev_canvas,
struct WebPPicture* const curr_canvas) {
(void)dispose;
(void)rect;
(void)prev_canvas;
(void)curr_canvas;
ErrorGIFNotAvailable();
}
void GIFBlendFrames(const struct WebPPicture* const src,
const GIFFrameRect* const rect,
struct WebPPicture* const dst) {
(void)src;
(void)rect;
(void)dst;
ErrorGIFNotAvailable();
}
void GIFDisplayError(const struct GifFileType* const gif, int gif_error) {
(void)gif;
(void)gif_error;
ErrorGIFNotAvailable();
}
void GIFClearPic(struct WebPPicture* const pic,
const GIFFrameRect* const rect) {
(void)pic;
(void)rect;
ErrorGIFNotAvailable();
}
void GIFCopyPixels(const struct WebPPicture* const src,
struct WebPPicture* const dst) {
(void)src;
(void)dst;
ErrorGIFNotAvailable();
}
#endif // WEBP_HAVE_GIF
// -----------------------------------------------------------------------------

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// Copyright 2014 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.
// -----------------------------------------------------------------------------
//
// GIF decode.
#ifndef WEBP_EXAMPLES_GIFDEC_H_
#define WEBP_EXAMPLES_GIFDEC_H_
#include <stdio.h>
#include "webp/types.h"
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#ifdef WEBP_HAVE_GIF
#include <gif_lib.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
// 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
#define GIF_INDEX_INVALID (-1)
typedef enum GIFDisposeMethod {
GIF_DISPOSE_NONE,
GIF_DISPOSE_BACKGROUND,
GIF_DISPOSE_RESTORE_PREVIOUS
} GIFDisposeMethod;
typedef struct {
int x_offset, y_offset, width, height;
} GIFFrameRect;
struct WebPData;
struct WebPPicture;
#ifndef WEBP_HAVE_GIF
struct ColorMapObject;
struct GifFileType;
typedef unsigned char GifByteType;
#endif
// Given the index of background color and transparent color, returns the
// corresponding background color (in BGRA format) in 'bgcolor'.
void GIFGetBackgroundColor(const struct ColorMapObject* const color_map,
int bgcolor_index, int transparent_index,
uint32_t* const bgcolor);
// Parses the given graphics extension data to get frame duration (in 1ms
// units), dispose method and transparent color index.
// Returns true on success.
int GIFReadGraphicsExtension(const GifByteType* const buf, int* const duration,
GIFDisposeMethod* const dispose,
int* const transparent_index);
// Reads the next GIF frame from 'gif' into 'picture'. Also, returns the GIF
// frame dimensions and offsets in 'rect'.
// Returns true on success.
int GIFReadFrame(struct GifFileType* const gif, int transparent_index,
GIFFrameRect* const gif_rect,
struct WebPPicture* const picture);
// Parses loop count from the given Netscape extension data.
int GIFReadLoopCount(struct GifFileType* const gif, GifByteType** const buf,
int* const loop_count);
// Parses the given ICC or XMP extension data and stores it into 'metadata'.
// Returns true on success.
int GIFReadMetadata(struct GifFileType* const gif, GifByteType** const buf,
struct WebPData* const metadata);
// Dispose the pixels within 'rect' of 'curr_canvas' based on 'dispose' method
// and 'prev_canvas'.
void GIFDisposeFrame(GIFDisposeMethod dispose, const GIFFrameRect* const rect,
const struct WebPPicture* const prev_canvas,
struct WebPPicture* const curr_canvas);
// Given 'src' picture and its frame rectangle 'rect', blend it into 'dst'.
void GIFBlendFrames(const struct WebPPicture* const src,
const GIFFrameRect* const rect,
struct WebPPicture* const dst);
// Prints an error string based on 'gif_error'.
void GIFDisplayError(const struct GifFileType* const gif, int gif_error);
// In the given 'pic', clear the pixels in 'rect' to transparent color.
void GIFClearPic(struct WebPPicture* const pic, const GIFFrameRect* const rect);
// Copy pixels from 'src' to 'dst' honoring strides. 'src' and 'dst' are assumed
// to be already allocated.
void GIFCopyPixels(const struct WebPPicture* const src,
struct WebPPicture* const dst);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_EXAMPLES_GIFDEC_H_

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// Copyright 2016 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.
// -----------------------------------------------------------------------------
//
// generate an animated WebP out of a sequence of images
// (PNG, JPEG, ...)
//
// Example usage:
// img2webp -o out.webp -q 40 -mixed -duration 40 input??.png
//
// Author: skal@google.com (Pascal Massimino)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#include "../examples/example_util.h"
#include "../imageio/image_dec.h"
#include "../imageio/imageio_util.h"
#include "./stopwatch.h"
#include "./unicode.h"
#include "sharpyuv/sharpyuv.h"
#include "webp/encode.h"
#include "webp/mux.h"
//------------------------------------------------------------------------------
static void Help(void) {
printf("Usage:\n\n");
printf(" img2webp [file_options] [[frame_options] frame_file]...");
printf(" [-o webp_file]\n\n");
printf("File-level options (only used at the start of compression):\n");
printf(" -min_size ............ minimize size\n");
printf(" -kmax <int> .......... maximum number of frame between key-frames\n"
" (0=only keyframes)\n");
printf(" -kmin <int> .......... minimum number of frame between key-frames\n"
" (0=disable key-frames altogether)\n");
printf(" -mixed ............... use mixed lossy/lossless automatic mode\n");
printf(" -near_lossless <int> . use near-lossless image preprocessing\n"
" (0..100=off), default=100\n");
printf(" -sharp_yuv ........... use sharper (and slower) RGB->YUV "
"conversion\n "
"(lossy only)\n");
printf(" -loop <int> .......... loop count (default: 0, = infinite loop)\n");
printf(" -v ................... verbose mode\n");
printf(" -h ................... this help\n");
printf(" -version ............. print version number and exit\n");
printf("\n");
printf("Per-frame options (only used for subsequent images input):\n");
printf(" -d <int> ............. frame duration in ms (default: 100)\n");
printf(" -lossless ........... use lossless mode (default)\n");
printf(" -lossy ... ........... use lossy mode\n");
printf(" -q <float> ........... quality\n");
printf(" -m <int> ............. method to use\n");
printf("\n");
printf("example: img2webp -loop 2 in0.png -lossy in1.jpg\n"
" -d 80 in2.tiff -o out.webp\n");
printf("\nNote: if a single file name is passed as the argument, the "
"arguments will be\n");
printf("tokenized from this file. The file name must not start with "
"the character '-'.\n");
printf("\nSupported input formats:\n %s\n",
WebPGetEnabledInputFileFormats());
}
//------------------------------------------------------------------------------
static int ReadImage(const char filename[], WebPPicture* const pic) {
const uint8_t* data = NULL;
size_t data_size = 0;
WebPImageReader reader;
int ok;
#ifdef HAVE_WINCODEC_H
// Try to decode the file using WIC falling back to the other readers for
// e.g., WebP.
ok = ReadPictureWithWIC(filename, pic, 1, NULL);
if (ok) return 1;
#endif
if (!ImgIoUtilReadFile(filename, &data, &data_size)) return 0;
reader = WebPGuessImageReader(data, data_size);
ok = reader(data, data_size, pic, 1, NULL);
WebPFree((void*)data);
return ok;
}
static int SetLoopCount(int loop_count, WebPData* const webp_data) {
int ok = 1;
WebPMuxError err;
uint32_t features;
WebPMuxAnimParams new_params;
WebPMux* const mux = WebPMuxCreate(webp_data, 1);
if (mux == NULL) return 0;
err = WebPMuxGetFeatures(mux, &features);
ok = (err == WEBP_MUX_OK);
if (!ok || !(features & ANIMATION_FLAG)) goto End;
err = WebPMuxGetAnimationParams(mux, &new_params);
ok = (err == WEBP_MUX_OK);
if (ok) {
new_params.loop_count = loop_count;
err = WebPMuxSetAnimationParams(mux, &new_params);
ok = (err == WEBP_MUX_OK);
}
if (ok) {
WebPDataClear(webp_data);
err = WebPMuxAssemble(mux, webp_data);
ok = (err == WEBP_MUX_OK);
}
End:
WebPMuxDelete(mux);
if (!ok) {
fprintf(stderr, "Error during loop-count setting\n");
}
return ok;
}
//------------------------------------------------------------------------------
int main(int argc, const char* argv[]) {
const char* output = NULL;
WebPAnimEncoder* enc = NULL;
int verbose = 0;
int pic_num = 0;
int duration = 100;
int timestamp_ms = 0;
int loop_count = 0;
int width = 0, height = 0;
WebPAnimEncoderOptions anim_config;
WebPConfig config;
WebPPicture pic;
WebPData webp_data;
int c;
int have_input = 0;
CommandLineArguments cmd_args;
int ok;
INIT_WARGV(argc, argv);
ok = ExUtilInitCommandLineArguments(argc - 1, argv + 1, &cmd_args);
if (!ok) FREE_WARGV_AND_RETURN(1);
argc = cmd_args.argc_;
argv = cmd_args.argv_;
WebPDataInit(&webp_data);
if (!WebPAnimEncoderOptionsInit(&anim_config) ||
!WebPConfigInit(&config) ||
!WebPPictureInit(&pic)) {
fprintf(stderr, "Library version mismatch!\n");
ok = 0;
goto End;
}
// 1st pass of option parsing
for (c = 0; ok && c < argc; ++c) {
if (argv[c][0] == '-') {
int parse_error = 0;
if (!strcmp(argv[c], "-o") && c + 1 < argc) {
argv[c] = NULL;
output = (const char*)GET_WARGV_SHIFTED(argv, ++c);
} else if (!strcmp(argv[c], "-kmin") && c + 1 < argc) {
argv[c] = NULL;
anim_config.kmin = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-kmax") && c + 1 < argc) {
argv[c] = NULL;
anim_config.kmax = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-loop") && c + 1 < argc) {
argv[c] = NULL;
loop_count = ExUtilGetInt(argv[++c], 0, &parse_error);
if (loop_count < 0) {
fprintf(stderr, "Invalid non-positive loop-count (%d)\n", loop_count);
parse_error = 1;
}
} else if (!strcmp(argv[c], "-min_size")) {
anim_config.minimize_size = 1;
} else if (!strcmp(argv[c], "-mixed")) {
anim_config.allow_mixed = 1;
config.lossless = 0;
} else if (!strcmp(argv[c], "-near_lossless") && c + 1 < argc) {
argv[c] = NULL;
config.near_lossless = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-sharp_yuv")) {
config.use_sharp_yuv = 1;
} else if (!strcmp(argv[c], "-v")) {
verbose = 1;
} else if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-version")) {
const int enc_version = WebPGetEncoderVersion();
const int mux_version = WebPGetMuxVersion();
const int sharpyuv_version = SharpYuvGetVersion();
printf("WebP Encoder version: %d.%d.%d\nWebP Mux version: %d.%d.%d\n",
(enc_version >> 16) & 0xff, (enc_version >> 8) & 0xff,
enc_version & 0xff, (mux_version >> 16) & 0xff,
(mux_version >> 8) & 0xff, mux_version & 0xff);
printf("libsharpyuv: %d.%d.%d\n", (sharpyuv_version >> 24) & 0xff,
(sharpyuv_version >> 16) & 0xffff, sharpyuv_version & 0xff);
goto End;
} else {
continue;
}
ok = !parse_error;
if (!ok) goto End;
argv[c] = NULL; // mark option as 'parsed' during 1st pass
} else {
have_input |= 1;
}
}
if (!have_input) {
fprintf(stderr, "No input file(s) for generating animation!\n");
goto End;
}
// image-reading pass
pic_num = 0;
config.lossless = 1;
for (c = 0; ok && c < argc; ++c) {
if (argv[c] == NULL) continue;
if (argv[c][0] == '-') { // parse local options
int parse_error = 0;
if (!strcmp(argv[c], "-lossy")) {
if (!anim_config.allow_mixed) config.lossless = 0;
} else if (!strcmp(argv[c], "-lossless")) {
if (!anim_config.allow_mixed) config.lossless = 1;
} else if (!strcmp(argv[c], "-q") && c + 1 < argc) {
config.quality = ExUtilGetFloat(argv[++c], &parse_error);
} else if (!strcmp(argv[c], "-m") && c + 1 < argc) {
config.method = ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-d") && c + 1 < argc) {
duration = ExUtilGetInt(argv[++c], 0, &parse_error);
if (duration <= 0) {
fprintf(stderr, "Invalid negative duration (%d)\n", duration);
parse_error = 1;
}
} else {
parse_error = 1; // shouldn't be here.
fprintf(stderr, "Unknown option [%s]\n", argv[c]);
}
ok = !parse_error;
if (!ok) goto End;
continue;
}
if (ok) {
ok = WebPValidateConfig(&config);
if (!ok) {
fprintf(stderr, "Invalid configuration.\n");
goto End;
}
}
// read next input image
pic.use_argb = 1;
ok = ReadImage((const char*)GET_WARGV_SHIFTED(argv, c), &pic);
if (!ok) goto End;
if (enc == NULL) {
width = pic.width;
height = pic.height;
enc = WebPAnimEncoderNew(width, height, &anim_config);
ok = (enc != NULL);
if (!ok) {
fprintf(stderr, "Could not create WebPAnimEncoder object.\n");
}
}
if (ok) {
ok = (width == pic.width && height == pic.height);
if (!ok) {
fprintf(stderr, "Frame #%d dimension mismatched! "
"Got %d x %d. Was expecting %d x %d.\n",
pic_num, pic.width, pic.height, width, height);
}
}
if (ok) {
ok = WebPAnimEncoderAdd(enc, &pic, timestamp_ms, &config);
if (!ok) {
fprintf(stderr, "Error while adding frame #%d\n", pic_num);
}
}
WebPPictureFree(&pic);
if (!ok) goto End;
if (verbose) {
WFPRINTF(stderr, "Added frame #%3d at time %4d (file: %s)\n",
pic_num, timestamp_ms, GET_WARGV_SHIFTED(argv, c));
}
timestamp_ms += duration;
++pic_num;
}
// add a last fake frame to signal the last duration
ok = ok && WebPAnimEncoderAdd(enc, NULL, timestamp_ms, NULL);
ok = ok && WebPAnimEncoderAssemble(enc, &webp_data);
if (!ok) {
fprintf(stderr, "Error during final animation assembly.\n");
}
End:
// free resources
WebPAnimEncoderDelete(enc);
if (ok && loop_count > 0) { // Re-mux to add loop count.
ok = SetLoopCount(loop_count, &webp_data);
}
if (ok) {
if (output != NULL) {
ok = ImgIoUtilWriteFile(output, webp_data.bytes, webp_data.size);
if (ok) WFPRINTF(stderr, "output file: %s ", (const W_CHAR*)output);
} else {
fprintf(stderr, "[no output file specified] ");
}
}
if (ok) {
fprintf(stderr, "[%d frames, %u bytes].\n",
pic_num, (unsigned int)webp_data.size);
}
WebPDataClear(&webp_data);
ExUtilDeleteCommandLineArguments(&cmd_args);
FREE_WARGV_AND_RETURN(ok ? 0 : 1);
}

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// Copyright 2011 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.
// -----------------------------------------------------------------------------
//
// Helper functions to measure elapsed time.
//
// Author: Mikolaj Zalewski (mikolajz@google.com)
#ifndef WEBP_EXAMPLES_STOPWATCH_H_
#define WEBP_EXAMPLES_STOPWATCH_H_
#include "webp/types.h"
#if defined _WIN32 && !defined __GNUC__
#include <windows.h>
typedef LARGE_INTEGER Stopwatch;
static WEBP_INLINE void StopwatchReset(Stopwatch* watch) {
QueryPerformanceCounter(watch);
}
static WEBP_INLINE double StopwatchReadAndReset(Stopwatch* watch) {
const LARGE_INTEGER old_value = *watch;
LARGE_INTEGER freq;
if (!QueryPerformanceCounter(watch))
return 0.0;
if (!QueryPerformanceFrequency(&freq))
return 0.0;
if (freq.QuadPart == 0)
return 0.0;
return (watch->QuadPart - old_value.QuadPart) / (double)freq.QuadPart;
}
#else /* !_WIN32 */
#include <string.h> // memcpy
#include <sys/time.h>
typedef struct timeval Stopwatch;
static WEBP_INLINE void StopwatchReset(Stopwatch* watch) {
gettimeofday(watch, NULL);
}
static WEBP_INLINE double StopwatchReadAndReset(Stopwatch* watch) {
struct timeval old_value;
double delta_sec, delta_usec;
memcpy(&old_value, watch, sizeof(old_value));
gettimeofday(watch, NULL);
delta_sec = (double)watch->tv_sec - old_value.tv_sec;
delta_usec = (double)watch->tv_usec - old_value.tv_usec;
return delta_sec + delta_usec / 1000000.0;
}
#endif /* _WIN32 */
#endif // WEBP_EXAMPLES_STOPWATCH_H_

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// Copyright 2018 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.
// -----------------------------------------------------------------------------
//
// Unicode support for Windows. The main idea is to maintain an array of Unicode
// arguments (wargv) and use it only for file paths. The regular argv is used
// for everything else.
//
// Author: Yannis Guyon (yguyon@google.com)
#ifndef WEBP_EXAMPLES_UNICODE_H_
#define WEBP_EXAMPLES_UNICODE_H_
#include <stdio.h>
#if defined(_WIN32) && defined(_UNICODE)
// wchar_t is used instead of TCHAR because we only perform additional work when
// Unicode is enabled and because the output of CommandLineToArgvW() is wchar_t.
#include <fcntl.h>
#include <io.h>
#include <wchar.h>
#include <windows.h>
#include <shellapi.h>
// Create a wchar_t array containing Unicode parameters.
#define INIT_WARGV(ARGC, ARGV) \
int wargc; \
const W_CHAR** const wargv = \
(const W_CHAR**)CommandLineToArgvW(GetCommandLineW(), &wargc); \
do { \
if (wargv == NULL || wargc != (ARGC)) { \
fprintf(stderr, "Error: Unable to get Unicode arguments.\n"); \
FREE_WARGV_AND_RETURN(-1); \
} \
} while (0)
// Use this to get a Unicode argument (e.g. file path).
#define GET_WARGV(UNUSED, C) wargv[C]
// For cases where argv is shifted by one compared to wargv.
#define GET_WARGV_SHIFTED(UNUSED, C) wargv[(C) + 1]
#define GET_WARGV_OR_NULL() wargv
// Release resources. LocalFree() is needed after CommandLineToArgvW().
#define FREE_WARGV() LOCAL_FREE((W_CHAR** const)wargv)
#define LOCAL_FREE(WARGV) \
do { \
if ((WARGV) != NULL) LocalFree(WARGV); \
} while (0)
#define W_CHAR wchar_t // WCHAR without underscore might already be defined.
#define TO_W_CHAR(STR) (L##STR)
#define WFOPEN(ARG, OPT) _wfopen((const W_CHAR*)ARG, TO_W_CHAR(OPT))
#define WFPRINTF(STREAM, STR, ...) \
do { \
int prev_mode; \
fflush(STREAM); \
prev_mode = _setmode(_fileno(STREAM), _O_U8TEXT); \
fwprintf(STREAM, TO_W_CHAR(STR), __VA_ARGS__); \
fflush(STREAM); \
(void)_setmode(_fileno(STREAM), prev_mode); \
} while (0)
#define WPRINTF(STR, ...) WFPRINTF(stdout, STR, __VA_ARGS__)
#define WSTRLEN(FILENAME) wcslen((const W_CHAR*)FILENAME)
#define WSTRCMP(FILENAME, STR) wcscmp((const W_CHAR*)FILENAME, TO_W_CHAR(STR))
#define WSTRRCHR(FILENAME, STR) wcsrchr((const W_CHAR*)FILENAME, TO_W_CHAR(STR))
#define WSNPRINTF(A, B, STR, ...) _snwprintf(A, B, TO_W_CHAR(STR), __VA_ARGS__)
#else
#include <string.h>
// Unicode file paths work as is on Unix platforms, and no extra work is done on
// Windows either if Unicode is disabled.
#define INIT_WARGV(ARGC, ARGV)
#define GET_WARGV(ARGV, C) (ARGV)[C]
#define GET_WARGV_SHIFTED(ARGV, C) (ARGV)[C]
#define GET_WARGV_OR_NULL() NULL
#define FREE_WARGV()
#define LOCAL_FREE(WARGV)
#define W_CHAR char
#define TO_W_CHAR(STR) (STR)
#define WFOPEN(ARG, OPT) fopen(ARG, OPT)
#define WPRINTF(STR, ...) printf(STR, __VA_ARGS__)
#define WFPRINTF(STREAM, STR, ...) fprintf(STREAM, STR, __VA_ARGS__)
#define WSTRLEN(FILENAME) strlen(FILENAME)
#define WSTRCMP(FILENAME, STR) strcmp(FILENAME, STR)
#define WSTRRCHR(FILENAME, STR) strrchr(FILENAME, STR)
#define WSNPRINTF(A, B, STR, ...) snprintf(A, B, STR, __VA_ARGS__)
#endif // defined(_WIN32) && defined(_UNICODE)
// Don't forget to free wargv before returning (e.g. from main).
#define FREE_WARGV_AND_RETURN(VALUE) \
do { \
FREE_WARGV(); \
return (VALUE); \
} while (0)
#endif // WEBP_EXAMPLES_UNICODE_H_

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// Copyright 2018 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.
// -----------------------------------------------------------------------------
//
// giflib doesn't have a Unicode DGifOpenFileName(). Let's make one.
//
// Author: Yannis Guyon (yguyon@google.com)
#ifndef WEBP_EXAMPLES_UNICODE_GIF_H_
#define WEBP_EXAMPLES_UNICODE_GIF_H_
#include "./unicode.h"
#ifdef HAVE_CONFIG_H
#include "webp/config.h" // For WEBP_HAVE_GIF
#endif
#if defined(WEBP_HAVE_GIF)
#ifdef _WIN32
#include <fcntl.h> // Not standard, needed for _topen and flags.
#include <io.h>
#endif
#include <gif_lib.h>
#include <string.h>
#include "./gifdec.h"
#if !defined(STDIN_FILENO)
#define STDIN_FILENO 0
#endif
static GifFileType* DGifOpenFileUnicode(const W_CHAR* file_name, int* error) {
if (!WSTRCMP(file_name, "-")) {
#if LOCAL_GIF_PREREQ(5, 0)
return DGifOpenFileHandle(STDIN_FILENO, error);
#else
(void)error;
return DGifOpenFileHandle(STDIN_FILENO);
#endif
}
#if defined(_WIN32) && defined(_UNICODE)
{
int file_handle = _wopen(file_name, _O_RDONLY | _O_BINARY);
if (file_handle == -1) {
if (error != NULL) *error = D_GIF_ERR_OPEN_FAILED;
return NULL;
}
#if LOCAL_GIF_PREREQ(5, 0)
return DGifOpenFileHandle(file_handle, error);
#else
return DGifOpenFileHandle(file_handle);
#endif
}
#else
#if LOCAL_GIF_PREREQ(5, 0)
return DGifOpenFileName(file_name, error);
#else
return DGifOpenFileName(file_name);
#endif
#endif // defined(_WIN32) && defined(_UNICODE)
// DGifCloseFile() is called later.
}
#endif // defined(WEBP_HAVE_GIF)
#endif // WEBP_EXAMPLES_UNICODE_GIF_H_

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// Copyright 2011 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.
// -----------------------------------------------------------------------------
//
// Simple OpenGL-based WebP file viewer.
//
// Author: Skal (pascal.massimino@gmail.com)
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#if defined(__unix__) || defined(__CYGWIN__)
#define _POSIX_C_SOURCE 200112L // for setenv
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(WEBP_HAVE_GL)
#if defined(HAVE_GLUT_GLUT_H)
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#ifdef FREEGLUT
#include <GL/freeglut.h>
#endif
#endif
#ifdef WEBP_HAVE_QCMS
#include <qcms.h>
#endif
#include "webp/decode.h"
#include "webp/demux.h"
#include "../examples/example_util.h"
#include "../imageio/imageio_util.h"
#include "./unicode.h"
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
// Unfortunate global variables. Gathered into a struct for comfort.
static struct {
int has_animation;
int has_color_profile;
int done;
int decoding_error;
int print_info;
int only_deltas;
int use_color_profile;
int draw_anim_background_color;
int canvas_width, canvas_height;
int loop_count;
uint32_t bg_color;
const char* file_name;
WebPData data;
WebPDecoderConfig config;
const WebPDecBuffer* pic;
WebPDemuxer* dmux;
WebPIterator curr_frame;
WebPIterator prev_frame;
WebPChunkIterator iccp;
int viewport_width, viewport_height;
} kParams;
static void ClearPreviousPic(void) {
WebPFreeDecBuffer((WebPDecBuffer*)kParams.pic);
kParams.pic = NULL;
}
static void ClearParams(void) {
ClearPreviousPic();
WebPDataClear(&kParams.data);
WebPDemuxReleaseIterator(&kParams.curr_frame);
WebPDemuxReleaseIterator(&kParams.prev_frame);
WebPDemuxReleaseChunkIterator(&kParams.iccp);
WebPDemuxDelete(kParams.dmux);
kParams.dmux = NULL;
}
// Sets the previous frame to the dimensions of the canvas and has it dispose
// to background to cause the canvas to be cleared.
static void ClearPreviousFrame(void) {
WebPIterator* const prev = &kParams.prev_frame;
prev->width = kParams.canvas_width;
prev->height = kParams.canvas_height;
prev->x_offset = prev->y_offset = 0;
prev->dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
}
// -----------------------------------------------------------------------------
// Color profile handling
static int ApplyColorProfile(const WebPData* const profile,
WebPDecBuffer* const rgba) {
#ifdef WEBP_HAVE_QCMS
int i, ok = 0;
uint8_t* line;
uint8_t major_revision;
qcms_profile* input_profile = NULL;
qcms_profile* output_profile = NULL;
qcms_transform* transform = NULL;
const qcms_data_type input_type = QCMS_DATA_RGBA_8;
const qcms_data_type output_type = QCMS_DATA_RGBA_8;
const qcms_intent intent = QCMS_INTENT_DEFAULT;
if (profile == NULL || rgba == NULL) return 0;
if (profile->bytes == NULL || profile->size < 10) return 1;
major_revision = profile->bytes[8];
qcms_enable_iccv4();
input_profile = qcms_profile_from_memory(profile->bytes, profile->size);
// qcms_profile_is_bogus() is broken with ICCv4.
if (input_profile == NULL ||
(major_revision < 4 && qcms_profile_is_bogus(input_profile))) {
fprintf(stderr, "Color profile is bogus!\n");
goto Error;
}
output_profile = qcms_profile_sRGB();
if (output_profile == NULL) {
fprintf(stderr, "Error creating output color profile!\n");
goto Error;
}
qcms_profile_precache_output_transform(output_profile);
transform = qcms_transform_create(input_profile, input_type,
output_profile, output_type,
intent);
if (transform == NULL) {
fprintf(stderr, "Error creating color transform!\n");
goto Error;
}
line = rgba->u.RGBA.rgba;
for (i = 0; i < rgba->height; ++i, line += rgba->u.RGBA.stride) {
qcms_transform_data(transform, line, line, rgba->width);
}
ok = 1;
Error:
if (input_profile != NULL) qcms_profile_release(input_profile);
if (output_profile != NULL) qcms_profile_release(output_profile);
if (transform != NULL) qcms_transform_release(transform);
return ok;
#else
(void)profile;
(void)rgba;
return 1;
#endif // WEBP_HAVE_QCMS
}
//------------------------------------------------------------------------------
// File decoding
static int Decode(void) { // Fills kParams.curr_frame
const WebPIterator* const curr = &kParams.curr_frame;
WebPDecoderConfig* const config = &kParams.config;
WebPDecBuffer* const output_buffer = &config->output;
int ok = 0;
ClearPreviousPic();
output_buffer->colorspace = MODE_RGBA;
ok = (WebPDecode(curr->fragment.bytes, curr->fragment.size,
config) == VP8_STATUS_OK);
if (!ok) {
fprintf(stderr, "Decoding of frame #%d failed!\n", curr->frame_num);
} else {
kParams.pic = output_buffer;
if (kParams.use_color_profile) {
ok = ApplyColorProfile(&kParams.iccp.chunk, output_buffer);
if (!ok) {
fprintf(stderr, "Applying color profile to frame #%d failed!\n",
curr->frame_num);
}
}
}
return ok;
}
static void decode_callback(int what) {
if (what == 0 && !kParams.done) {
int duration = 0;
if (kParams.dmux != NULL) {
WebPIterator* const curr = &kParams.curr_frame;
if (!WebPDemuxNextFrame(curr)) {
WebPDemuxReleaseIterator(curr);
if (WebPDemuxGetFrame(kParams.dmux, 1, curr)) {
--kParams.loop_count;
kParams.done = (kParams.loop_count == 0);
if (kParams.done) return;
ClearPreviousFrame();
} else {
kParams.decoding_error = 1;
kParams.done = 1;
return;
}
}
duration = curr->duration;
// Behavior copied from Chrome, cf:
// https://cs.chromium.org/chromium/src/third_party/WebKit/Source/
// platform/graphics/DeferredImageDecoder.cpp?
// rcl=b4c33049f096cd283f32be9a58b9a9e768227c26&l=246
if (duration <= 10) duration = 100;
}
if (!Decode()) {
kParams.decoding_error = 1;
kParams.done = 1;
} else {
glutPostRedisplay();
glutTimerFunc(duration, decode_callback, what);
}
}
}
//------------------------------------------------------------------------------
// Callbacks
static void HandleKey(unsigned char key, int pos_x, int pos_y) {
// Note: rescaling the window or toggling some features during an animation
// generates visual artifacts. This is not fixed because refreshing the frame
// may require rendering the whole animation from start till current frame.
(void)pos_x;
(void)pos_y;
if (key == 'q' || key == 'Q' || key == 27 /* Esc */) {
#ifdef FREEGLUT
glutLeaveMainLoop();
#else
ClearParams();
exit(0);
#endif
} else if (key == 'c') {
if (kParams.has_color_profile && !kParams.decoding_error) {
kParams.use_color_profile = 1 - kParams.use_color_profile;
if (kParams.has_animation) {
// Restart the completed animation to pickup the color profile change.
if (kParams.done && kParams.loop_count == 0) {
kParams.loop_count =
(int)WebPDemuxGetI(kParams.dmux, WEBP_FF_LOOP_COUNT) + 1;
kParams.done = 0;
// Start the decode loop immediately.
glutTimerFunc(0, decode_callback, 0);
}
} else {
Decode();
glutPostRedisplay();
}
}
} else if (key == 'b') {
kParams.draw_anim_background_color = 1 - kParams.draw_anim_background_color;
if (!kParams.has_animation) ClearPreviousFrame();
glutPostRedisplay();
} else if (key == 'i') {
kParams.print_info = 1 - kParams.print_info;
if (!kParams.has_animation) ClearPreviousFrame();
glutPostRedisplay();
} else if (key == 'd') {
kParams.only_deltas = 1 - kParams.only_deltas;
glutPostRedisplay();
}
}
static void HandleReshape(int width, int height) {
// Note: reshape doesn't preserve aspect ratio, and might
// be handling larger-than-screen pictures incorrectly.
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
kParams.viewport_width = width;
kParams.viewport_height = height;
if (!kParams.has_animation) ClearPreviousFrame();
}
static void PrintString(const char* const text) {
void* const font = GLUT_BITMAP_9_BY_15;
int i;
for (i = 0; text[i]; ++i) {
glutBitmapCharacter(font, text[i]);
}
}
static void PrintStringW(const char* const text) {
#if defined(_WIN32) && defined(_UNICODE)
void* const font = GLUT_BITMAP_9_BY_15;
const W_CHAR* const wtext = (const W_CHAR*)text;
int i;
for (i = 0; wtext[i]; ++i) {
glutBitmapCharacter(font, wtext[i]);
}
#else
PrintString(text);
#endif
}
static float GetColorf(uint32_t color, int shift) {
return ((color >> shift) & 0xff) / 255.f;
}
static void DrawCheckerBoard(void) {
const int square_size = 8; // must be a power of 2
int x, y;
GLint viewport[4]; // x, y, width, height
glPushMatrix();
glGetIntegerv(GL_VIEWPORT, viewport);
// shift to integer coordinates with (0,0) being top-left.
glOrtho(0, viewport[2], viewport[3], 0, -1, 1);
for (y = 0; y < viewport[3]; y += square_size) {
for (x = 0; x < viewport[2]; x += square_size) {
const GLubyte color = 128 + 64 * (!((x + y) & square_size));
glColor3ub(color, color, color);
glRecti(x, y, x + square_size, y + square_size);
}
}
glPopMatrix();
}
static void DrawBackground(void) {
// Whole window cleared with clear color, checkerboard rendered on top of it.
glClear(GL_COLOR_BUFFER_BIT);
DrawCheckerBoard();
// ANIM background color rendered (blend) on top. Default is white for still
// images (without ANIM chunk). glClear() can't be used for that (no blend).
if (kParams.draw_anim_background_color) {
glPushMatrix();
glLoadIdentity();
glColor4f(GetColorf(kParams.bg_color, 16), // BGRA from spec
GetColorf(kParams.bg_color, 8),
GetColorf(kParams.bg_color, 0),
GetColorf(kParams.bg_color, 24));
glRecti(-1, -1, +1, +1);
glPopMatrix();
}
}
// Draw background in a scissored rectangle.
static void DrawBackgroundScissored(int window_x, int window_y, int frame_w,
int frame_h) {
// Only update the requested area, not the whole canvas.
window_x = window_x * kParams.viewport_width / kParams.canvas_width;
window_y = window_y * kParams.viewport_height / kParams.canvas_height;
frame_w = frame_w * kParams.viewport_width / kParams.canvas_width;
frame_h = frame_h * kParams.viewport_height / kParams.canvas_height;
// glScissor() takes window coordinates (0,0 at bottom left).
window_y = kParams.viewport_height - window_y - frame_h;
glEnable(GL_SCISSOR_TEST);
glScissor(window_x, window_y, frame_w, frame_h);
DrawBackground();
glDisable(GL_SCISSOR_TEST);
}
static void HandleDisplay(void) {
const WebPDecBuffer* const pic = kParams.pic;
const WebPIterator* const curr = &kParams.curr_frame;
WebPIterator* const prev = &kParams.prev_frame;
GLfloat xoff, yoff;
if (pic == NULL) return;
glPushMatrix();
glPixelZoom((GLfloat)(+1. / kParams.canvas_width * kParams.viewport_width),
(GLfloat)(-1. / kParams.canvas_height * kParams.viewport_height));
xoff = (GLfloat)(2. * curr->x_offset / kParams.canvas_width);
yoff = (GLfloat)(2. * curr->y_offset / kParams.canvas_height);
glRasterPos2f(-1.f + xoff, 1.f - yoff);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
if (kParams.only_deltas) {
DrawBackground();
} else {
// The rectangle of the previous frame might be different than the current
// frame, so we may need to DrawBackgroundScissored for both.
if (prev->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
// Clear the previous frame rectangle.
DrawBackgroundScissored(prev->x_offset, prev->y_offset, prev->width,
prev->height);
}
if (curr->blend_method == WEBP_MUX_NO_BLEND) {
// We simulate no-blending behavior by first clearing the current frame
// rectangle and then alpha-blending against it.
DrawBackgroundScissored(curr->x_offset, curr->y_offset, curr->width,
curr->height);
}
}
*prev = *curr;
glDrawPixels(pic->width, pic->height,
GL_RGBA, GL_UNSIGNED_BYTE,
(GLvoid*)pic->u.RGBA.rgba);
if (kParams.print_info) {
char tmp[32];
glColor4f(0.90f, 0.0f, 0.90f, 1.0f);
glRasterPos2f(-0.95f, 0.90f);
PrintStringW(kParams.file_name);
snprintf(tmp, sizeof(tmp), "Dimension:%d x %d", pic->width, pic->height);
glColor4f(0.90f, 0.0f, 0.90f, 1.0f);
glRasterPos2f(-0.95f, 0.80f);
PrintString(tmp);
if (curr->x_offset != 0 || curr->y_offset != 0) {
snprintf(tmp, sizeof(tmp), " (offset:%d,%d)",
curr->x_offset, curr->y_offset);
glRasterPos2f(-0.95f, 0.70f);
PrintString(tmp);
}
}
glPopMatrix();
#if defined(__APPLE__) || defined(_WIN32)
glFlush();
#else
glutSwapBuffers();
#endif
}
static void StartDisplay(void) {
int width = kParams.canvas_width;
int height = kParams.canvas_height;
int screen_width, screen_height;
// TODO(webp:365) GLUT_DOUBLE results in flickering / old frames to be
// partially displayed with animated webp + alpha.
#if defined(__APPLE__) || defined(_WIN32)
glutInitDisplayMode(GLUT_RGBA);
#else
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
#endif
screen_width = glutGet(GLUT_SCREEN_WIDTH);
screen_height = glutGet(GLUT_SCREEN_HEIGHT);
if (width > screen_width || height > screen_height) {
if (width > screen_width) {
height = (height * screen_width + width - 1) / width;
width = screen_width;
}
if (height > screen_height) {
width = (width * screen_height + height - 1) / height;
height = screen_height;
}
}
glutInitWindowSize(width, height);
glutCreateWindow("WebP viewer");
glutDisplayFunc(HandleDisplay);
glutReshapeFunc(HandleReshape);
glutIdleFunc(NULL);
glutKeyboardFunc(HandleKey);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glClearColor(0, 0, 0, 0); // window will be cleared to black (no blend)
DrawBackground();
}
//------------------------------------------------------------------------------
// Main
static void Help(void) {
printf(
"Usage: vwebp in_file [options]\n\n"
"Decodes the WebP image file and visualize it using OpenGL\n"
"Options are:\n"
" -version ..... print version number and exit\n"
" -noicc ....... don't use the icc profile if present\n"
" -nofancy ..... don't use the fancy YUV420 upscaler\n"
" -nofilter .... disable in-loop filtering\n"
" -dither <int> dithering strength (0..100), default=50\n"
" -noalphadither disable alpha plane dithering\n"
" -usebgcolor .. display background color\n"
" -mt .......... use multi-threading\n"
" -info ........ print info\n"
" -h ........... this help message\n"
"\n"
"Keyboard shortcuts:\n"
" 'c' ................ toggle use of color profile\n"
" 'b' ................ toggle background color display\n"
" 'i' ................ overlay file information\n"
" 'd' ................ disable blending & disposal (debug)\n"
" 'q' / 'Q' / ESC .... quit\n");
}
int main(int argc, char* argv[]) {
int c;
WebPDecoderConfig* const config = &kParams.config;
WebPIterator* const curr = &kParams.curr_frame;
INIT_WARGV(argc, argv);
if (!WebPInitDecoderConfig(config)) {
fprintf(stderr, "Library version mismatch!\n");
FREE_WARGV_AND_RETURN(-1);
}
config->options.dithering_strength = 50;
config->options.alpha_dithering_strength = 100;
kParams.use_color_profile = 1;
// Background color hidden by default to see transparent areas.
kParams.draw_anim_background_color = 0;
for (c = 1; c < argc; ++c) {
int parse_error = 0;
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
Help();
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-noicc")) {
kParams.use_color_profile = 0;
} else if (!strcmp(argv[c], "-nofancy")) {
config->options.no_fancy_upsampling = 1;
} else if (!strcmp(argv[c], "-nofilter")) {
config->options.bypass_filtering = 1;
} else if (!strcmp(argv[c], "-noalphadither")) {
config->options.alpha_dithering_strength = 0;
} else if (!strcmp(argv[c], "-usebgcolor")) {
kParams.draw_anim_background_color = 1;
} else if (!strcmp(argv[c], "-dither") && c + 1 < argc) {
config->options.dithering_strength =
ExUtilGetInt(argv[++c], 0, &parse_error);
} else if (!strcmp(argv[c], "-info")) {
kParams.print_info = 1;
} else if (!strcmp(argv[c], "-version")) {
const int dec_version = WebPGetDecoderVersion();
const int dmux_version = WebPGetDemuxVersion();
printf("WebP Decoder version: %d.%d.%d\nWebP Demux version: %d.%d.%d\n",
(dec_version >> 16) & 0xff, (dec_version >> 8) & 0xff,
dec_version & 0xff, (dmux_version >> 16) & 0xff,
(dmux_version >> 8) & 0xff, dmux_version & 0xff);
FREE_WARGV_AND_RETURN(0);
} else if (!strcmp(argv[c], "-mt")) {
config->options.use_threads = 1;
} else if (!strcmp(argv[c], "--")) {
if (c < argc - 1) kParams.file_name = (const char*)GET_WARGV(argv, ++c);
break;
} else if (argv[c][0] == '-') {
printf("Unknown option '%s'\n", argv[c]);
Help();
FREE_WARGV_AND_RETURN(-1);
} else {
kParams.file_name = (const char*)GET_WARGV(argv, c);
}
if (parse_error) {
Help();
FREE_WARGV_AND_RETURN(-1);
}
}
if (kParams.file_name == NULL) {
printf("missing input file!!\n");
Help();
FREE_WARGV_AND_RETURN(0);
}
if (!ImgIoUtilReadFile(kParams.file_name,
&kParams.data.bytes, &kParams.data.size)) {
goto Error;
}
if (!WebPGetInfo(kParams.data.bytes, kParams.data.size, NULL, NULL)) {
fprintf(stderr, "Input file doesn't appear to be WebP format.\n");
goto Error;
}
kParams.dmux = WebPDemux(&kParams.data);
if (kParams.dmux == NULL) {
fprintf(stderr, "Could not create demuxing object!\n");
goto Error;
}
kParams.canvas_width = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_WIDTH);
kParams.canvas_height = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_HEIGHT);
if (kParams.print_info) {
printf("Canvas: %d x %d\n", kParams.canvas_width, kParams.canvas_height);
}
ClearPreviousFrame();
memset(&kParams.iccp, 0, sizeof(kParams.iccp));
kParams.has_color_profile =
!!(WebPDemuxGetI(kParams.dmux, WEBP_FF_FORMAT_FLAGS) & ICCP_FLAG);
if (kParams.has_color_profile) {
#ifdef WEBP_HAVE_QCMS
if (!WebPDemuxGetChunk(kParams.dmux, "ICCP", 1, &kParams.iccp)) goto Error;
printf("VP8X: Found color profile\n");
#else
fprintf(stderr, "Warning: color profile present, but qcms is unavailable!\n"
"Build libqcms from Mozilla or Chromium and define WEBP_HAVE_QCMS "
"before building.\n");
#endif
}
if (!WebPDemuxGetFrame(kParams.dmux, 1, curr)) goto Error;
kParams.has_animation = (curr->num_frames > 1);
kParams.loop_count = (int)WebPDemuxGetI(kParams.dmux, WEBP_FF_LOOP_COUNT);
kParams.bg_color = WebPDemuxGetI(kParams.dmux, WEBP_FF_BACKGROUND_COLOR);
printf("VP8X: Found %d images in file (loop count = %d)\n",
curr->num_frames, kParams.loop_count);
// Decode first frame
if (!Decode()) goto Error;
// Position iterator to last frame. Next call to HandleDisplay will wrap over.
// We take this into account by bumping up loop_count.
WebPDemuxGetFrame(kParams.dmux, 0, curr);
if (kParams.loop_count) ++kParams.loop_count;
#if defined(__unix__) || defined(__CYGWIN__)
// Work around GLUT compositor bug.
// https://bugs.launchpad.net/ubuntu/+source/freeglut/+bug/369891
setenv("XLIB_SKIP_ARGB_VISUALS", "1", 1);
#endif
// Start display (and timer)
glutInit(&argc, argv);
#ifdef FREEGLUT
glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
#endif
StartDisplay();
if (kParams.has_animation) glutTimerFunc(0, decode_callback, 0);
glutMainLoop();
// Should only be reached when using FREEGLUT:
ClearParams();
FREE_WARGV_AND_RETURN(0);
Error:
ClearParams();
FREE_WARGV_AND_RETURN(-1);
}
#else // !WEBP_HAVE_GL
int main(int argc, const char* argv[]) {
fprintf(stderr, "OpenGL support not enabled in %s.\n", argv[0]);
(void)argc;
return 0;
}
#endif
//------------------------------------------------------------------------------

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