mirror of
https://github.com/webmproject/libwebp.git
synced 2024-11-20 04:18:26 +01:00
606c4304c4
We reduce transparency by turning some transparent pixels into corresponding RGB values from previous canvas. This improves compression by about 23%. Change-Id: I02d70a43a1d0906ac09a7e2dc510be3b2d38f593
669 lines
23 KiB
C
669 lines
23 KiB
C
// 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 <string.h>
|
||
|
||
#ifdef HAVE_CONFIG_H
|
||
#include "config.h"
|
||
#endif
|
||
|
||
#ifdef WEBP_HAVE_GIF
|
||
|
||
#include <gif_lib.h>
|
||
#include "webp/encode.h"
|
||
#include "webp/mux.h"
|
||
#include "./example_util.h"
|
||
#include "./gif2webp_util.h"
|
||
|
||
#define GIF_TRANSPARENT_MASK 0x01
|
||
#define GIF_DISPOSE_MASK 0x07
|
||
#define GIF_DISPOSE_SHIFT 2
|
||
#define WHITE_COLOR 0xffffffff
|
||
#define MAX_CACHE_SIZE 30
|
||
|
||
//------------------------------------------------------------------------------
|
||
|
||
// Global variables gathered in a struct.
|
||
static int transparent_index = -1; // Index of transparent color in the map.
|
||
static int is_first_frame = 1; // Whether we are processing the first frame.
|
||
|
||
static void SanitizeKeyFrameIntervals(size_t* const kmin_ptr,
|
||
size_t* const kmax_ptr) {
|
||
size_t kmin = *kmin_ptr;
|
||
size_t kmax = *kmax_ptr;
|
||
|
||
if (kmin == 0) kmin = ~0; // Disable keyframe insertion.
|
||
if (kmax == 0) kmax = ~0;
|
||
|
||
if (kmin >= kmax) {
|
||
kmin = kmax - 1;
|
||
fprintf(stderr,
|
||
"WARNING: Setting kmin = %zu, so that kmin < kmax.\n", kmin);
|
||
} else if (kmin < (kmax / 2 + 1)) {
|
||
// This ensures that cache.keyframe + kmin >= kmax is always true. So, we
|
||
// can flush all the frames in the ‘count_since_key_frame == kmax’ case.
|
||
kmin = (kmax / 2 + 1);
|
||
fprintf(stderr,
|
||
"WARNING: Setting kmin = %zu, so that kmin >= kmax / 2 + 1.\n",
|
||
kmin);
|
||
}
|
||
// Limit the max number of frames that are allocated.
|
||
if (kmax - kmin > MAX_CACHE_SIZE) {
|
||
fprintf(stderr,
|
||
"WARNING: Setting kmin = %zu, so that kmax - kmin <= 30.\n", kmin);
|
||
kmin = kmax - MAX_CACHE_SIZE;
|
||
}
|
||
*kmin_ptr = kmin;
|
||
*kmax_ptr = kmax;
|
||
}
|
||
|
||
static void Remap(const uint8_t* const src, const GifFileType* const gif,
|
||
uint32_t* dst, int len) {
|
||
int i;
|
||
const GifColorType* colors;
|
||
const ColorMapObject* const cmap =
|
||
gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
|
||
if (cmap == NULL) return;
|
||
colors = cmap->Colors;
|
||
|
||
for (i = 0; i < len; ++i) {
|
||
const GifColorType c = colors[src[i]];
|
||
dst[i] = (src[i] == transparent_index) ? TRANSPARENT_COLOR
|
||
: c.Blue | (c.Green << 8) | (c.Red << 16) | (0xff << 24);
|
||
}
|
||
}
|
||
|
||
// Read the GIF image frame.
|
||
static int ReadFrame(GifFileType* const gif, WebPFrameRect* const gif_rect,
|
||
WebPPicture* const sub_image, WebPPicture* const curr) {
|
||
const GifImageDesc image_desc = gif->Image;
|
||
uint32_t* dst = NULL;
|
||
uint8_t* tmp = NULL;
|
||
int ok = 0;
|
||
WebPFrameRect rect = {
|
||
image_desc.Left, image_desc.Top, image_desc.Width, image_desc.Height
|
||
};
|
||
*gif_rect = rect;
|
||
|
||
// Use a view for the sub-picture:
|
||
if (!WebPPictureView(curr, 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);
|
||
goto End;
|
||
}
|
||
dst = sub_image->argb;
|
||
|
||
tmp = (uint8_t*)malloc(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) {
|
||
int y;
|
||
for (y = interlace_offsets[pass]; y < rect.height;
|
||
y += interlace_jumps[pass]) {
|
||
if (DGifGetLine(gif, tmp, rect.width) == GIF_ERROR) goto End;
|
||
Remap(tmp, gif, dst + y * sub_image->argb_stride, rect.width);
|
||
}
|
||
}
|
||
} else { // Non-interlaced image.
|
||
int y;
|
||
for (y = 0; y < rect.height; ++y) {
|
||
if (DGifGetLine(gif, tmp, rect.width) == GIF_ERROR) goto End;
|
||
Remap(tmp, gif, dst + y * sub_image->argb_stride, rect.width);
|
||
}
|
||
}
|
||
ok = 1;
|
||
|
||
End:
|
||
free(tmp);
|
||
return ok;
|
||
}
|
||
|
||
// Optimize the image frame for WebP and encode it.
|
||
static int OptimizeAndEncodeFrame(
|
||
const WebPConfig* const config, const WebPFrameRect* const gif_rect,
|
||
WebPPicture* const curr, WebPPicture* const prev_canvas,
|
||
WebPPicture* const curr_canvas, WebPPicture* const sub_image,
|
||
WebPMuxFrameInfo* const info, WebPFrameCache* const cache) {
|
||
WebPFrameRect rect = *gif_rect;
|
||
|
||
// Snap to even offsets (and adjust dimensions if needed).
|
||
rect.width += (rect.x_offset & 1);
|
||
rect.height += (rect.y_offset & 1);
|
||
rect.x_offset &= ~1;
|
||
rect.y_offset &= ~1;
|
||
|
||
if (!WebPPictureView(curr, rect.x_offset, rect.y_offset,
|
||
rect.width, rect.height, sub_image)) {
|
||
return 0;
|
||
}
|
||
info->x_offset = rect.x_offset;
|
||
info->y_offset = rect.y_offset;
|
||
|
||
if (is_first_frame || WebPUtilIsKeyFrame(curr, &rect, prev_canvas)) {
|
||
// Add this as a key frame.
|
||
if (!WebPFrameCacheAddFrame(cache, config, NULL, NULL, info, sub_image)) {
|
||
return 0;
|
||
}
|
||
// Update prev_canvas by simply copying from 'curr'.
|
||
WebPUtilCopyPixels(curr, prev_canvas);
|
||
} else {
|
||
if (!config->lossless) {
|
||
// For lossy compression, it's better to replace transparent pixels of
|
||
// 'curr' with actual RGB values, whenever possible.
|
||
WebPUtilReduceTransparency(prev_canvas, &rect, curr);
|
||
}
|
||
if (!WebPFrameCacheShouldTryKeyFrame(cache)) {
|
||
// Add this as a frame rectangle.
|
||
if (!WebPFrameCacheAddFrame(cache, config, info, sub_image, NULL, NULL)) {
|
||
return 0;
|
||
}
|
||
// Update prev_canvas by blending 'curr' into it.
|
||
WebPUtilBlendPixels(curr, gif_rect, prev_canvas);
|
||
} else {
|
||
WebPPicture full_image;
|
||
WebPMuxFrameInfo full_image_info;
|
||
int ok;
|
||
|
||
// Convert to a key frame.
|
||
WebPUtilCopyPixels(curr, curr_canvas);
|
||
WebPUtilConvertToKeyFrame(prev_canvas, &rect, curr_canvas);
|
||
if (!WebPPictureView(curr_canvas, rect.x_offset, rect.y_offset,
|
||
rect.width, rect.height, &full_image)) {
|
||
return 0;
|
||
}
|
||
full_image_info = *info;
|
||
full_image_info.x_offset = rect.x_offset;
|
||
full_image_info.y_offset = rect.y_offset;
|
||
|
||
// Add both variants to cache: frame rectangle and key frame.
|
||
ok = WebPFrameCacheAddFrame(cache, config, info, sub_image,
|
||
&full_image_info, &full_image);
|
||
WebPPictureFree(&full_image);
|
||
if (!ok) return 0;
|
||
|
||
// Update prev_canvas by simply copying from 'curr_canvas'.
|
||
WebPUtilCopyPixels(curr_canvas, prev_canvas);
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static void DisposeFrame(WebPMuxAnimDispose dispose_method,
|
||
const WebPFrameRect* const gif_rect,
|
||
WebPPicture* const frame, WebPPicture* const canvas) {
|
||
if (dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
|
||
WebPUtilClearPic(frame, NULL);
|
||
WebPUtilClearPic(canvas, gif_rect);
|
||
}
|
||
}
|
||
|
||
static int GetBackgroundColor(const ColorMapObject* const color_map,
|
||
GifWord bgcolor_idx, uint32_t* const bgcolor) {
|
||
if (transparent_index != -1 && bgcolor_idx == transparent_index) {
|
||
*bgcolor = TRANSPARENT_COLOR; // Special case.
|
||
return 1;
|
||
} else if (color_map == NULL || color_map->Colors == NULL
|
||
|| bgcolor_idx >= color_map->ColorCount) {
|
||
return 0; // Invalid color map or index.
|
||
} else {
|
||
const GifColorType color = color_map->Colors[bgcolor_idx];
|
||
*bgcolor = (0xff << 24)
|
||
| (color.Red << 16)
|
||
| (color.Green << 8)
|
||
| (color.Blue << 0);
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
static void DisplayGifError(const GifFileType* const gif, int gif_error) {
|
||
// GIFLIB_MAJOR is only defined in libgif >= 4.2.0.
|
||
// libgif 4.2.0 has retired PrintGifError() and added GifErrorString().
|
||
#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR) && \
|
||
((GIFLIB_MAJOR == 4 && GIFLIB_MINOR >= 2) || GIFLIB_MAJOR > 4)
|
||
#if GIFLIB_MAJOR >= 5
|
||
// Static string actually, hence the const char* cast.
|
||
const char* error_str = (const char*)GifErrorString(
|
||
(gif == NULL) ? gif_error : gif->Error);
|
||
#else
|
||
const char* error_str = (const char*)GifErrorString();
|
||
(void)gif;
|
||
#endif
|
||
if (error_str == NULL) error_str = "Unknown error";
|
||
fprintf(stderr, "GIFLib Error %d: %s\n", gif_error, error_str);
|
||
#else
|
||
(void)gif;
|
||
fprintf(stderr, "GIFLib Error %d: ", gif_error);
|
||
PrintGifError();
|
||
fprintf(stderr, "\n");
|
||
#endif
|
||
}
|
||
|
||
static const char* const kErrorMessages[] = {
|
||
"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];
|
||
}
|
||
|
||
//------------------------------------------------------------------------------
|
||
|
||
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(" -q <float> ............. quality factor (0:small..100:big)\n");
|
||
printf(" -m <int> ............... compression method (0=fast, 6=slowest)\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("\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 char *in_file = NULL, *out_file = NULL;
|
||
FILE* out = NULL;
|
||
GifFileType* gif = NULL;
|
||
WebPConfig config;
|
||
WebPPicture curr_frame;
|
||
WebPPicture prev_canvas;
|
||
WebPPicture curr_canvas;
|
||
WebPMuxFrameInfo frame;
|
||
WebPMuxAnimParams anim = { WHITE_COLOR, 0 };
|
||
WebPFrameCache* cache = NULL;
|
||
|
||
int done;
|
||
int c;
|
||
int quiet = 0;
|
||
WebPMux* mux = NULL;
|
||
WebPData webp_data = { NULL, 0 };
|
||
int stored_icc = 0; // Whether we have already stored an ICC profile.
|
||
int stored_xmp = 0;
|
||
|
||
int default_kmin = 1; // Whether to use default kmin value.
|
||
int default_kmax = 1;
|
||
size_t kmin = 0;
|
||
size_t kmax = 0;
|
||
|
||
memset(&frame, 0, sizeof(frame));
|
||
frame.id = WEBP_CHUNK_ANMF;
|
||
frame.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
|
||
frame.blend_method = WEBP_MUX_BLEND;
|
||
|
||
if (!WebPConfigInit(&config) || !WebPPictureInit(&curr_frame) ||
|
||
!WebPPictureInit(&prev_canvas) || !WebPPictureInit(&curr_canvas)) {
|
||
fprintf(stderr, "Error! Version mismatch!\n");
|
||
return -1;
|
||
}
|
||
config.lossless = 1; // Use lossless compression by default.
|
||
|
||
if (argc == 1) {
|
||
Help();
|
||
return 0;
|
||
}
|
||
|
||
for (c = 1; c < argc; ++c) {
|
||
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
|
||
Help();
|
||
return 0;
|
||
} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
|
||
out_file = argv[++c];
|
||
} else if (!strcmp(argv[c], "-lossy")) {
|
||
config.lossless = 0;
|
||
} else if (!strcmp(argv[c], "-q") && c < argc - 1) {
|
||
config.quality = (float)strtod(argv[++c], NULL);
|
||
} else if (!strcmp(argv[c], "-m") && c < argc - 1) {
|
||
config.method = strtol(argv[++c], NULL, 0);
|
||
} else if (!strcmp(argv[c], "-kmax") && c < argc - 1) {
|
||
kmax = strtoul(argv[++c], NULL, 0);
|
||
default_kmax = 0;
|
||
} else if (!strcmp(argv[c], "-kmin") && c < argc - 1) {
|
||
kmin = strtoul(argv[++c], NULL, 0);
|
||
default_kmin = 0;
|
||
} else if (!strcmp(argv[c], "-f") && c < argc - 1) {
|
||
config.filter_strength = strtol(argv[++c], NULL, 0);
|
||
} 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);
|
||
return 0;
|
||
} else if (!strcmp(argv[c], "-quiet")) {
|
||
quiet = 1;
|
||
} else if (!strcmp(argv[c], "-v")) {
|
||
verbose = 1;
|
||
} else if (argv[c][0] == '-') {
|
||
fprintf(stderr, "Error! Unknown option '%s'\n", argv[c]);
|
||
Help();
|
||
return -1;
|
||
} else {
|
||
in_file = argv[c];
|
||
}
|
||
}
|
||
|
||
// Appropriate default kmin, kmax values for lossy and lossless.
|
||
if (default_kmin) {
|
||
kmin = config.lossless ? 9 : 3;
|
||
}
|
||
if (default_kmax) {
|
||
kmax = config.lossless ? 17 : 5;
|
||
}
|
||
SanitizeKeyFrameIntervals(&kmin, &kmax);
|
||
|
||
cache = WebPFrameCacheNew(kmin, kmax);
|
||
if (cache == NULL) goto End;
|
||
|
||
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
|
||
#if defined(GIFLIB_MAJOR) && (GIFLIB_MAJOR >= 5)
|
||
// There was an API change in version 5.0.0.
|
||
gif = DGifOpenFileName(in_file, &gif_error);
|
||
#else
|
||
gif = DGifOpenFileName(in_file);
|
||
#endif
|
||
if (gif == NULL) goto End;
|
||
|
||
// Allocate current buffer
|
||
curr_frame.width = gif->SWidth;
|
||
curr_frame.height = gif->SHeight;
|
||
curr_frame.use_argb = 1;
|
||
if (!WebPPictureAlloc(&curr_frame)) goto End;
|
||
if (!WebPPictureCopy(&curr_frame, &prev_canvas)) goto End;
|
||
if (!WebPPictureCopy(&curr_frame, &curr_canvas)) goto End;
|
||
|
||
mux = WebPMuxNew();
|
||
if (mux == NULL) {
|
||
fprintf(stderr, "ERROR: could not create a mux object.\n");
|
||
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: {
|
||
WebPPicture sub_image;
|
||
WebPFrameRect gif_rect;
|
||
|
||
if (!DGifGetImageDesc(gif)) goto End;
|
||
if (!ReadFrame(gif, &gif_rect, &sub_image, &curr_frame)) {
|
||
goto End;
|
||
}
|
||
|
||
if (!OptimizeAndEncodeFrame(&config, &gif_rect, &curr_frame,
|
||
&prev_canvas, &curr_canvas, &sub_image,
|
||
&frame, cache)) {
|
||
fprintf(stderr, "Error! Cannot encode frame as WebP\n");
|
||
fprintf(stderr, "Error code: %d\n", sub_image.error_code);
|
||
}
|
||
WebPPictureFree(&sub_image);
|
||
|
||
err = WebPFrameCacheFlush(cache, verbose, mux);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not add animation frame.\n",
|
||
ErrorString(err));
|
||
goto End;
|
||
}
|
||
|
||
DisposeFrame(frame.dispose_method, &gif_rect,
|
||
&curr_frame, &prev_canvas);
|
||
is_first_frame = 0;
|
||
break;
|
||
}
|
||
case EXTENSION_RECORD_TYPE: {
|
||
int extension;
|
||
GifByteType *data = NULL;
|
||
if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
|
||
goto End;
|
||
}
|
||
switch (extension) {
|
||
case COMMENT_EXT_FUNC_CODE: {
|
||
break; // Do nothing for now.
|
||
}
|
||
case GRAPHICS_EXT_FUNC_CODE: {
|
||
const int flags = data[1];
|
||
const int dispose = (flags >> GIF_DISPOSE_SHIFT) & GIF_DISPOSE_MASK;
|
||
const int delay = data[2] | (data[3] << 8); // In 10 ms units.
|
||
if (data[0] != 4) goto End;
|
||
frame.duration = delay * 10; // Duration is in 1 ms units for WebP.
|
||
if (dispose == 3) {
|
||
fprintf(stderr, "WARNING: GIF_DISPOSE_RESTORE not supported.");
|
||
// failsafe. TODO(urvang): emulate the correct behaviour by
|
||
// recoding the whole frame.
|
||
frame.dispose_method = WEBP_MUX_DISPOSE_BACKGROUND;
|
||
} else {
|
||
frame.dispose_method =
|
||
(dispose == 2) ? WEBP_MUX_DISPOSE_BACKGROUND
|
||
: WEBP_MUX_DISPOSE_NONE;
|
||
}
|
||
transparent_index = (flags & GIF_TRANSPARENT_MASK) ? data[4] : -1;
|
||
if (is_first_frame) {
|
||
if (!GetBackgroundColor(gif->SColorMap, gif->SBackGroundColor,
|
||
&anim.bgcolor)) {
|
||
fprintf(stderr, "GIF decode warning: invalid background color "
|
||
"index. Assuming white background.\n");
|
||
}
|
||
WebPUtilClearPic(&curr_frame, NULL);
|
||
WebPUtilClearPic(&prev_canvas, NULL);
|
||
}
|
||
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)) {
|
||
// Recognize and parse Netscape2.0 NAB extension for loop count.
|
||
if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) goto End;
|
||
if (data == NULL) goto End; // Loop count sub-block missing.
|
||
if (data[0] != 3 && data[1] != 1) break; // wrong size/marker
|
||
anim.loop_count = data[2] | (data[3] << 8);
|
||
if (verbose) printf("Loop count: %d\n", anim.loop_count);
|
||
} else { // An extension containing metadata.
|
||
// We only store the first encountered chunk of each type.
|
||
const int is_xmp =
|
||
!stored_xmp && !memcmp(data + 1, "XMP DataXMP", 11);
|
||
const int is_icc =
|
||
!stored_icc && !memcmp(data + 1, "ICCRGBG1012", 11);
|
||
if (is_xmp || is_icc) {
|
||
const char* const fourccs[2] = { "XMP " , "ICCP" };
|
||
const char* const features[2] = { "XMP" , "ICC" };
|
||
WebPData metadata = { NULL, 0 };
|
||
// 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 prev_metadata = metadata;
|
||
WebPData subblock;
|
||
if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) {
|
||
WebPDataClear(&metadata);
|
||
goto End;
|
||
}
|
||
if (data == NULL) break; // Finished.
|
||
subblock.size = is_xmp ? data[0] + 1 : data[0];
|
||
assert(subblock.size > 0);
|
||
subblock.bytes = is_xmp ? data : data + 1;
|
||
metadata.bytes =
|
||
(uint8_t*)realloc((void*)metadata.bytes,
|
||
prev_metadata.size + subblock.size);
|
||
if (metadata.bytes == NULL) {
|
||
WebPDataClear(&prev_metadata);
|
||
goto End;
|
||
}
|
||
metadata.size += subblock.size;
|
||
memcpy((void*)(metadata.bytes + prev_metadata.size),
|
||
subblock.bytes, 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;
|
||
}
|
||
}
|
||
|
||
// Add metadata chunk.
|
||
err = WebPMuxSetChunk(mux, fourccs[is_icc], &metadata, 1);
|
||
if (verbose) {
|
||
printf("%s size: %d\n", features[is_icc], (int)metadata.size);
|
||
}
|
||
WebPDataClear(&metadata);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not set %s chunk.\n",
|
||
ErrorString(err), features[is_icc]);
|
||
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);
|
||
|
||
// Flush any pending frames.
|
||
err = WebPFrameCacheFlushAll(cache, verbose, mux);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not add animation frame.\n",
|
||
ErrorString(err));
|
||
goto End;
|
||
}
|
||
|
||
// Finish muxing
|
||
err = WebPMuxSetAnimationParams(mux, &anim);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s): Could not set animation parameters.\n",
|
||
ErrorString(err));
|
||
goto End;
|
||
}
|
||
|
||
err = WebPMuxAssemble(mux, &webp_data);
|
||
if (err != WEBP_MUX_OK) {
|
||
fprintf(stderr, "ERROR (%s) assembling the WebP file.\n", ErrorString(err));
|
||
goto End;
|
||
}
|
||
if (out_file != NULL) {
|
||
if (!ExUtilWriteFile(out_file, webp_data.bytes, webp_data.size)) {
|
||
fprintf(stderr, "Error writing output file: %s\n", out_file);
|
||
goto End;
|
||
}
|
||
if (!quiet) {
|
||
printf("Saved output file: %s\n", out_file);
|
||
}
|
||
} else {
|
||
if (!quiet) {
|
||
printf("Nothing written; use -o flag to save the result.\n");
|
||
}
|
||
}
|
||
|
||
// All OK.
|
||
ok = 1;
|
||
gif_error = GIF_OK;
|
||
|
||
End:
|
||
WebPDataClear(&webp_data);
|
||
WebPMuxDelete(mux);
|
||
WebPPictureFree(&curr_frame);
|
||
WebPPictureFree(&prev_canvas);
|
||
WebPPictureFree(&curr_canvas);
|
||
WebPFrameCacheDelete(cache);
|
||
if (out != NULL && out_file != NULL) fclose(out);
|
||
|
||
if (gif_error != GIF_OK) {
|
||
DisplayGifError(gif, gif_error);
|
||
}
|
||
if (gif != NULL) {
|
||
DGifCloseFile(gif);
|
||
}
|
||
|
||
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
|
||
|
||
//------------------------------------------------------------------------------
|