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libwebp/examples/gif2webp.c
Urvang Joshi f0d6a14b64 gif2webp: Insert independent frames at regular intervals. 
We use the 'do not blend' option for creating independent frames.
We also mark the already independent frames as 'do not blend'.

This bounds the maximum number of frames that need to be decoded to
decode a given frame, thus leading to a much better decoding performance.

Change-Id: I7cef98af2b53751ec36993fd2bd54f7f4c4aad2b
2013-08-20 11:47:48 -07:00

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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.
// -----------------------------------------------------------------------------
//
// 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 "config.h"
#endif
#include <gif_lib.h>
#include "webp/encode.h"
#include "webp/mux.h"
#include "./example_util.h"
#define GIF_TRANSPARENT_MASK 0x01
#define GIF_DISPOSE_MASK 0x07
#define GIF_DISPOSE_SHIFT 2
#define TRANSPARENT_COLOR 0x00ffffff
#define WHITE_COLOR 0xffffffff
//------------------------------------------------------------------------------
static int transparent_index = -1; // No transparency by default.
static void ClearRectangle(WebPPicture* const picture,
int left, int top, int width, int height) {
int j;
for (j = top; j < top + height; ++j) {
uint32_t* const dst = picture->argb + j * picture->argb_stride;
int i;
for (i = left; i < left + width; ++i) {
dst[i] = TRANSPARENT_COLOR;
}
}
}
typedef struct WebPFrameRect {
int x_offset, y_offset, width, height;
} WebPFrameRect;
// Clear pixels in 'picture' within given 'rect' to transparent color.
static void ClearPicture(WebPPicture* const picture,
const WebPFrameRect* const rect) {
if (rect != NULL) {
ClearRectangle(picture, rect->x_offset, rect->y_offset,
rect->width, rect->height);
} else {
ClearRectangle(picture, 0, 0, picture->width, picture->height);
}
}
// TODO: Also used in picture.c. Move to a common location.
static void CopyPlane(const uint8_t* src, int src_stride,
uint8_t* dst, int dst_stride, int width, int height) {
while (height-- > 0) {
memcpy(dst, src, width);
src += src_stride;
dst += dst_stride;
}
}
// Given 'curr_frame' and its 'rect', blend it in the 'canvas'.
static void BlendCurrentFrameInCanvas(const WebPPicture* const curr_frame,
const WebPFrameRect* const rect,
WebPPicture* const canvas) {
int j;
assert(canvas->width == curr_frame->width &&
canvas->height == curr_frame->height);
for (j = rect->y_offset; j < rect->y_offset + rect->height; ++j) {
int i;
for (i = rect->x_offset; i < rect->x_offset + rect->width; ++i) {
const uint32_t src =
curr_frame->argb[j * curr_frame->argb_stride + i];
const int src_alpha = src >> 24;
if (src_alpha != 0) {
canvas->argb[j * canvas->argb_stride + i] = src;
}
}
}
}
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);
}
}
// Returns true if 'curr' frame is a key frame, that is, it can be decoded
// independently of 'prev' canvas.
static int IsKeyFrame(const WebPPicture* const curr,
const WebPFrameRect* const curr_rect,
const WebPPicture* const prev) {
int i, j;
int is_key_frame = 1;
// If previous canvas (with previous frame disposed) is all transparent,
// current frame is a key frame.
for (i = 0; i < prev->width; ++i) {
for (j = 0; j < prev->height; ++j) {
const uint32_t prev_alpha = (prev->argb[j * prev->argb_stride + i]) >> 24;
if (prev_alpha != 0) {
is_key_frame = 0;
break;
}
}
if (!is_key_frame) break;
}
if (is_key_frame) return 1;
// If current frame covers the whole canvas and does not contain any
// transparent pixels that depend on previous canvas, then current frame is
// a key frame.
if (curr_rect->width == curr->width && curr_rect->height == curr->height) {
assert(curr_rect->x_offset == 0 && curr_rect->y_offset == 0);
is_key_frame = 1;
for (j = 0; j < prev->height; ++j) {
for (i = 0; i < prev->width; ++i) {
const uint32_t prev_alpha =
(prev->argb[j * prev->argb_stride + i]) >> 24;
const uint32_t curr_alpha =
(curr->argb[j * curr->argb_stride + i]) >> 24;
if (curr_alpha != 0xff && prev_alpha != 0) {
is_key_frame = 0;
break;
}
}
if (!is_key_frame) break;
}
if (is_key_frame) return 1;
}
return 0;
}
// Convert 'curr' frame to a key frame.
static void ConvertToKeyFrame(WebPPicture* const curr,
const WebPPicture* const prev,
WebPFrameRect* const rect) {
int j;
assert(curr->width == prev->width && curr->height == prev->height);
// Replace transparent pixels of current canvas with those from previous
// canvas (with previous frame disposed).
for (j = 0; j < curr->height; ++j) {
int i;
for (i = 0; i < curr->width; ++i) {
uint32_t* const curr_pixel = curr->argb + j * curr->argb_stride + i;
const int curr_alpha = *curr_pixel >> 24;
if (curr_alpha == 0) {
*curr_pixel = prev->argb[j * prev->argb_stride + i];
}
}
}
// Frame rectangle now covers the whole canvas.
rect->x_offset = 0;
rect->y_offset = 0;
rect->width = curr->width;
rect->height = curr->height;
}
static int ReadSubImage(GifFileType* gif, WebPPicture* const prev,
int is_first_frame, size_t key_frame_interval,
size_t* const count_since_key_frame,
WebPFrameRect* const gif_rect, WebPPicture* sub_image,
WebPMuxFrameInfo* const info, 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);
}
}
// 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;
// Make this a key frame if needed.
if (is_first_frame || IsKeyFrame(curr, &rect, prev)) {
*count_since_key_frame = 0;
} else {
++*count_since_key_frame;
if (*count_since_key_frame > key_frame_interval) {
ConvertToKeyFrame(curr, prev, &rect);
*count_since_key_frame = 0;
}
}
if (*count_since_key_frame == 0) {
info->blend_method = WEBP_MUX_NO_BLEND; // Key frame, so no need to blend.
} else {
info->blend_method = WEBP_MUX_BLEND; // The blending method in GIF.
}
// Update the canvas so that it can be used to check for and/or create an
// key frame in the next iterations.
if (info->blend_method == WEBP_MUX_NO_BLEND) {
CopyPlane((uint8_t*)curr->argb, 4 * curr->argb_stride, (uint8_t*)prev->argb,
4 * prev->argb_stride, 4 * curr->width, curr->height);
} else {
BlendCurrentFrameInCanvas(curr, gif_rect, prev);
}
WebPPictureView(curr, rect.x_offset, rect.y_offset, rect.width, rect.height,
sub_image);
info->x_offset = rect.x_offset;
info->y_offset = rect.y_offset;
ok = 1;
End:
free(tmp);
return ok;
}
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(" -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;
WebPPicture current;
WebPPicture previous;
WebPMuxFrameInfo frame;
WebPMuxAnimParams anim = { WHITE_COLOR, 0 };
int is_first_frame = 1;
size_t count_since_key_frame = 0; // Frames seen since the last key frame.
size_t key_frame_interval = 9; // Max distance between key frames.
int done;
int c;
int quiet = 0;
WebPConfig config;
WebPMux* mux = NULL;
WebPData webp_data = { NULL, 0 };
int stored_icc = 0; // Whether we have already stored an ICC profile.
int stored_xmp = 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(&current) || !WebPPictureInit(&previous)) {
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) {
key_frame_interval = strtoul(argv[++c], NULL, 0);
if (key_frame_interval == 0) key_frame_interval = ~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];
}
}
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
current.width = gif->SWidth;
current.height = gif->SHeight;
current.use_argb = 1;
if (!WebPPictureAlloc(&current)) goto End;
if (!WebPPictureCopy(&current, &previous)) 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;
WebPMemoryWriter memory;
if (!DGifGetImageDesc(gif)) goto End;
if (!ReadSubImage(gif, &previous, is_first_frame, key_frame_interval,
&count_since_key_frame, &gif_rect, &sub_image, &frame,
&current)) {
goto End;
}
if (!config.lossless) {
// We need to call BGRA variant because of the way we do Remap(). Note
// that 'sub_image' will no longer be a view and own some memory.
WebPPictureImportBGRA(
&sub_image, (uint8_t*)sub_image.argb,
sub_image.argb_stride * sizeof(*sub_image.argb));
sub_image.use_argb = 0;
} else {
sub_image.use_argb = 1;
}
sub_image.writer = WebPMemoryWrite;
sub_image.custom_ptr = &memory;
WebPMemoryWriterInit(&memory);
if (!WebPEncode(&config, &sub_image)) {
fprintf(stderr, "Error! Cannot encode current as WebP\n");
fprintf(stderr, "Error code: %d\n", sub_image.error_code);
goto End;
}
// Now we have all the info about the frame, as a Graphic Control
// Extension Block always appears before the Image Descriptor Block.
// So add the frame to mux.
frame.bitstream.bytes = memory.mem;
frame.bitstream.size = memory.size;
err = WebPMuxPushFrame(mux, &frame, 1);
if (err != WEBP_MUX_OK) {
fprintf(stderr, "ERROR (%s): Could not add animation frame.\n",
ErrorString(err));
goto End;
}
if (verbose) {
printf("Added frame %dx%d (offset:%d,%d duration:%d) ",
sub_image.width, sub_image.height,
frame.x_offset, frame.y_offset,
frame.duration);
printf("dispose:%d blend:%d transparent index:%d\n",
frame.dispose_method, frame.blend_method, transparent_index);
}
WebPDataClear(&frame.bitstream);
WebPPictureFree(&sub_image);
is_first_frame = 0;
if (frame.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
ClearPicture(&current, NULL);
ClearPicture(&previous, &gif_rect);
}
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");
}
ClearPicture(&current, NULL);
ClearPicture(&previous, 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);
// 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(&current);
WebPPictureFree(&previous);
if (out != NULL && out_file != NULL) fclose(out);
if (gif_error != GIF_OK) {
DisplayGifError(gif, gif_error);
}
if (gif != NULL) {
DGifCloseFile(gif);
}
return !ok;
}
//------------------------------------------------------------------------------
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