Green Sky
67653bbe50
git-subtree-dir: external/libwebp/libwebp git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f
610 lines
20 KiB
C
610 lines
20 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// simple tool to convert animated GIFs to WebP
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//
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// Authors: Skal (pascal.massimino@gmail.com)
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// Urvang (urvang@google.com)
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_CONFIG_H
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#include "webp/config.h"
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#endif
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#ifdef WEBP_HAVE_GIF
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#if defined(HAVE_UNISTD_H) && HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <gif_lib.h>
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#include "webp/encode.h"
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#include "webp/mux.h"
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#include "../examples/example_util.h"
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#include "../imageio/imageio_util.h"
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#include "./gifdec.h"
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#include "./unicode.h"
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#include "./unicode_gif.h"
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#if !defined(STDIN_FILENO)
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#define STDIN_FILENO 0
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#endif
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//------------------------------------------------------------------------------
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static int transparent_index = GIF_INDEX_INVALID; // Opaque by default.
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static const char* const kErrorMessages[-WEBP_MUX_NOT_ENOUGH_DATA + 1] = {
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"WEBP_MUX_NOT_FOUND", "WEBP_MUX_INVALID_ARGUMENT", "WEBP_MUX_BAD_DATA",
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"WEBP_MUX_MEMORY_ERROR", "WEBP_MUX_NOT_ENOUGH_DATA"
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};
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static const char* ErrorString(WebPMuxError err) {
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assert(err <= WEBP_MUX_NOT_FOUND && err >= WEBP_MUX_NOT_ENOUGH_DATA);
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return kErrorMessages[-err];
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}
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enum {
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METADATA_ICC = (1 << 0),
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METADATA_XMP = (1 << 1),
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METADATA_ALL = METADATA_ICC | METADATA_XMP
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};
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//------------------------------------------------------------------------------
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static void Help(void) {
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printf("Usage:\n");
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printf(" gif2webp [options] gif_file -o webp_file\n");
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printf("Options:\n");
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printf(" -h / -help ............. this help\n");
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printf(" -lossy ................. encode image using lossy compression\n");
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printf(" -mixed ................. for each frame in the image, pick lossy\n"
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" or lossless compression heuristically\n");
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printf(" -q <float> ............. quality factor (0:small..100:big)\n");
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printf(" -m <int> ............... compression method (0=fast, 6=slowest)\n");
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printf(" -min_size .............. minimize output size (default:off)\n"
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" lossless compression by default; can be\n"
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" combined with -q, -m, -lossy or -mixed\n"
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" options\n");
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printf(" -kmin <int> ............ min distance between key frames\n");
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printf(" -kmax <int> ............ max distance between key frames\n");
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printf(" -f <int> ............... filter strength (0=off..100)\n");
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printf(" -metadata <string> ..... comma separated list of metadata to\n");
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printf(" ");
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printf("copy from the input to the output if present\n");
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printf(" ");
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printf("Valid values: all, none, icc, xmp (default)\n");
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printf(" -loop_compatibility .... use compatibility mode for Chrome\n");
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printf(" version prior to M62 (inclusive)\n");
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printf(" -mt .................... use multi-threading if available\n");
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printf("\n");
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printf(" -version ............... print version number and exit\n");
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printf(" -v ..................... verbose\n");
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printf(" -quiet ................. don't print anything\n");
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printf("\n");
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}
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//------------------------------------------------------------------------------
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int main(int argc, const char* argv[]) {
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int verbose = 0;
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int gif_error = GIF_ERROR;
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WebPMuxError err = WEBP_MUX_OK;
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int ok = 0;
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const W_CHAR* in_file = NULL, *out_file = NULL;
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GifFileType* gif = NULL;
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int frame_duration = 0;
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int frame_timestamp = 0;
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GIFDisposeMethod orig_dispose = GIF_DISPOSE_NONE;
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WebPPicture frame; // Frame rectangle only (not disposed).
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WebPPicture curr_canvas; // Not disposed.
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WebPPicture prev_canvas; // Disposed.
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WebPAnimEncoder* enc = NULL;
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WebPAnimEncoderOptions enc_options;
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WebPConfig config;
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int frame_number = 0; // Whether we are processing the first frame.
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int done;
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int c;
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int quiet = 0;
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WebPData webp_data;
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int keep_metadata = METADATA_XMP; // ICC not output by default.
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WebPData icc_data;
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int stored_icc = 0; // Whether we have already stored an ICC profile.
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WebPData xmp_data;
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int stored_xmp = 0; // Whether we have already stored an XMP profile.
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int loop_count = 0; // default: infinite
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int stored_loop_count = 0; // Whether we have found an explicit loop count.
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int loop_compatibility = 0;
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WebPMux* mux = NULL;
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int default_kmin = 1; // Whether to use default kmin value.
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int default_kmax = 1;
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INIT_WARGV(argc, argv);
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if (!WebPConfigInit(&config) || !WebPAnimEncoderOptionsInit(&enc_options) ||
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!WebPPictureInit(&frame) || !WebPPictureInit(&curr_canvas) ||
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!WebPPictureInit(&prev_canvas)) {
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fprintf(stderr, "Error! Version mismatch!\n");
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FREE_WARGV_AND_RETURN(-1);
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}
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config.lossless = 1; // Use lossless compression by default.
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WebPDataInit(&webp_data);
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WebPDataInit(&icc_data);
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WebPDataInit(&xmp_data);
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if (argc == 1) {
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Help();
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FREE_WARGV_AND_RETURN(0);
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}
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for (c = 1; c < argc; ++c) {
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int parse_error = 0;
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if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
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Help();
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FREE_WARGV_AND_RETURN(0);
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} else if (!strcmp(argv[c], "-o") && c < argc - 1) {
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out_file = GET_WARGV(argv, ++c);
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} else if (!strcmp(argv[c], "-lossy")) {
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config.lossless = 0;
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} else if (!strcmp(argv[c], "-mixed")) {
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enc_options.allow_mixed = 1;
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config.lossless = 0;
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} else if (!strcmp(argv[c], "-loop_compatibility")) {
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loop_compatibility = 1;
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} else if (!strcmp(argv[c], "-q") && c < argc - 1) {
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config.quality = ExUtilGetFloat(argv[++c], &parse_error);
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} else if (!strcmp(argv[c], "-m") && c < argc - 1) {
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config.method = ExUtilGetInt(argv[++c], 0, &parse_error);
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} else if (!strcmp(argv[c], "-min_size")) {
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enc_options.minimize_size = 1;
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} else if (!strcmp(argv[c], "-kmax") && c < argc - 1) {
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enc_options.kmax = ExUtilGetInt(argv[++c], 0, &parse_error);
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default_kmax = 0;
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} else if (!strcmp(argv[c], "-kmin") && c < argc - 1) {
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enc_options.kmin = ExUtilGetInt(argv[++c], 0, &parse_error);
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default_kmin = 0;
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} else if (!strcmp(argv[c], "-f") && c < argc - 1) {
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config.filter_strength = ExUtilGetInt(argv[++c], 0, &parse_error);
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} else if (!strcmp(argv[c], "-metadata") && c < argc - 1) {
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static const struct {
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const char* option;
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int flag;
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} kTokens[] = {
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{ "all", METADATA_ALL },
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{ "none", 0 },
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{ "icc", METADATA_ICC },
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{ "xmp", METADATA_XMP },
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};
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const size_t kNumTokens = sizeof(kTokens) / sizeof(*kTokens);
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const char* start = argv[++c];
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const char* const end = start + strlen(start);
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keep_metadata = 0;
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while (start < end) {
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size_t i;
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const char* token = strchr(start, ',');
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if (token == NULL) token = end;
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for (i = 0; i < kNumTokens; ++i) {
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if ((size_t)(token - start) == strlen(kTokens[i].option) &&
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!strncmp(start, kTokens[i].option, strlen(kTokens[i].option))) {
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if (kTokens[i].flag != 0) {
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keep_metadata |= kTokens[i].flag;
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} else {
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keep_metadata = 0;
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}
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break;
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}
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}
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if (i == kNumTokens) {
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fprintf(stderr, "Error! Unknown metadata type '%.*s'\n",
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(int)(token - start), start);
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Help();
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FREE_WARGV_AND_RETURN(-1);
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}
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start = token + 1;
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}
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} else if (!strcmp(argv[c], "-mt")) {
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++config.thread_level;
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} else if (!strcmp(argv[c], "-version")) {
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const int enc_version = WebPGetEncoderVersion();
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const int mux_version = WebPGetMuxVersion();
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printf("WebP Encoder version: %d.%d.%d\nWebP Mux version: %d.%d.%d\n",
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(enc_version >> 16) & 0xff, (enc_version >> 8) & 0xff,
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enc_version & 0xff, (mux_version >> 16) & 0xff,
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(mux_version >> 8) & 0xff, mux_version & 0xff);
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FREE_WARGV_AND_RETURN(0);
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} else if (!strcmp(argv[c], "-quiet")) {
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quiet = 1;
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enc_options.verbose = 0;
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} else if (!strcmp(argv[c], "-v")) {
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verbose = 1;
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enc_options.verbose = 1;
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} else if (!strcmp(argv[c], "--")) {
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if (c < argc - 1) in_file = GET_WARGV(argv, ++c);
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break;
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} else if (argv[c][0] == '-') {
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fprintf(stderr, "Error! Unknown option '%s'\n", argv[c]);
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Help();
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FREE_WARGV_AND_RETURN(-1);
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} else {
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in_file = GET_WARGV(argv, c);
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}
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if (parse_error) {
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Help();
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FREE_WARGV_AND_RETURN(-1);
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}
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}
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// Appropriate default kmin, kmax values for lossy and lossless.
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if (default_kmin) {
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enc_options.kmin = config.lossless ? 9 : 3;
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}
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if (default_kmax) {
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enc_options.kmax = config.lossless ? 17 : 5;
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}
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if (!WebPValidateConfig(&config)) {
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fprintf(stderr, "Error! Invalid configuration.\n");
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goto End;
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}
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if (in_file == NULL) {
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fprintf(stderr, "No input file specified!\n");
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Help();
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goto End;
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}
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// Start the decoder object
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gif = DGifOpenFileUnicode(in_file, &gif_error);
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if (gif == NULL) goto End;
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// Loop over GIF images
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done = 0;
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do {
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GifRecordType type;
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if (DGifGetRecordType(gif, &type) == GIF_ERROR) goto End;
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switch (type) {
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case IMAGE_DESC_RECORD_TYPE: {
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GIFFrameRect gif_rect;
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GifImageDesc* const image_desc = &gif->Image;
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if (!DGifGetImageDesc(gif)) goto End;
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if (frame_number == 0) {
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if (verbose) {
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printf("Canvas screen: %d x %d\n", gif->SWidth, gif->SHeight);
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}
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// Fix some broken GIF global headers that report
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// 0 x 0 screen dimension.
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if (gif->SWidth == 0 || gif->SHeight == 0) {
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image_desc->Left = 0;
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image_desc->Top = 0;
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gif->SWidth = image_desc->Width;
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gif->SHeight = image_desc->Height;
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if (gif->SWidth <= 0 || gif->SHeight <= 0) {
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goto End;
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}
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if (verbose) {
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printf("Fixed canvas screen dimension to: %d x %d\n",
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gif->SWidth, gif->SHeight);
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}
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}
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// Allocate current buffer.
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frame.width = gif->SWidth;
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frame.height = gif->SHeight;
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frame.use_argb = 1;
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if (!WebPPictureAlloc(&frame)) goto End;
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GIFClearPic(&frame, NULL);
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if (!(WebPPictureCopy(&frame, &curr_canvas) &&
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WebPPictureCopy(&frame, &prev_canvas))) {
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fprintf(stderr, "Error allocating canvas.\n");
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goto End;
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}
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// Background color.
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GIFGetBackgroundColor(gif->SColorMap, gif->SBackGroundColor,
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transparent_index,
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&enc_options.anim_params.bgcolor);
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// Initialize encoder.
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enc = WebPAnimEncoderNew(curr_canvas.width, curr_canvas.height,
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&enc_options);
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if (enc == NULL) {
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fprintf(stderr,
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"Error! Could not create encoder object. Possibly due to "
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"a memory error.\n");
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goto End;
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}
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}
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// Some even more broken GIF can have sub-rect with zero width/height.
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if (image_desc->Width == 0 || image_desc->Height == 0) {
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image_desc->Width = gif->SWidth;
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image_desc->Height = gif->SHeight;
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}
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if (!GIFReadFrame(gif, transparent_index, &gif_rect, &frame)) {
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goto End;
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}
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// Blend frame rectangle with previous canvas to compose full canvas.
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// Note that 'curr_canvas' is same as 'prev_canvas' at this point.
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GIFBlendFrames(&frame, &gif_rect, &curr_canvas);
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if (!WebPAnimEncoderAdd(enc, &curr_canvas, frame_timestamp, &config)) {
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fprintf(stderr, "Error while adding frame #%d: %s\n", frame_number,
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WebPAnimEncoderGetError(enc));
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goto End;
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} else {
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++frame_number;
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}
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// Update canvases.
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GIFDisposeFrame(orig_dispose, &gif_rect, &prev_canvas, &curr_canvas);
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GIFCopyPixels(&curr_canvas, &prev_canvas);
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// Force frames with a small or no duration to 100ms to be consistent
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// with web browsers and other transcoding tools. This also avoids
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// incorrect durations between frames when padding frames are
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// discarded.
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if (frame_duration <= 10) {
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frame_duration = 100;
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}
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// Update timestamp (for next frame).
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frame_timestamp += frame_duration;
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// In GIF, graphic control extensions are optional for a frame, so we
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// may not get one before reading the next frame. To handle this case,
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// we reset frame properties to reasonable defaults for the next frame.
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orig_dispose = GIF_DISPOSE_NONE;
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frame_duration = 0;
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transparent_index = GIF_INDEX_INVALID;
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break;
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}
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case EXTENSION_RECORD_TYPE: {
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int extension;
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GifByteType* data = NULL;
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if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
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goto End;
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}
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if (data == NULL) continue;
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switch (extension) {
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case COMMENT_EXT_FUNC_CODE: {
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break; // Do nothing for now.
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}
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case GRAPHICS_EXT_FUNC_CODE: {
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if (!GIFReadGraphicsExtension(data, &frame_duration, &orig_dispose,
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&transparent_index)) {
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goto End;
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}
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break;
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}
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case PLAINTEXT_EXT_FUNC_CODE: {
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break;
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}
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case APPLICATION_EXT_FUNC_CODE: {
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if (data[0] != 11) break; // Chunk is too short
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if (!memcmp(data + 1, "NETSCAPE2.0", 11) ||
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!memcmp(data + 1, "ANIMEXTS1.0", 11)) {
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if (!GIFReadLoopCount(gif, &data, &loop_count)) {
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goto End;
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}
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if (verbose) {
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fprintf(stderr, "Loop count: %d\n", loop_count);
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}
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stored_loop_count = loop_compatibility ? (loop_count != 0) : 1;
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} else { // An extension containing metadata.
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// We only store the first encountered chunk of each type, and
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// only if requested by the user.
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const int is_xmp = (keep_metadata & METADATA_XMP) &&
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!stored_xmp &&
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!memcmp(data + 1, "XMP DataXMP", 11);
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const int is_icc = (keep_metadata & METADATA_ICC) &&
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!stored_icc &&
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!memcmp(data + 1, "ICCRGBG1012", 11);
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if (is_xmp || is_icc) {
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if (!GIFReadMetadata(gif, &data,
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is_xmp ? &xmp_data : &icc_data)) {
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goto End;
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}
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if (is_icc) {
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stored_icc = 1;
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} else if (is_xmp) {
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stored_xmp = 1;
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}
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}
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}
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break;
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}
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default: {
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break; // skip
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}
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}
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while (data != NULL) {
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if (DGifGetExtensionNext(gif, &data) == GIF_ERROR) goto End;
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}
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break;
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}
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case TERMINATE_RECORD_TYPE: {
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done = 1;
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break;
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}
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default: {
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if (verbose) {
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fprintf(stderr, "Skipping over unknown record type %d\n", type);
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}
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break;
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}
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}
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} while (!done);
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// Last NULL frame.
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if (!WebPAnimEncoderAdd(enc, NULL, frame_timestamp, NULL)) {
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fprintf(stderr, "Error flushing WebP muxer.\n");
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fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
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}
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if (!WebPAnimEncoderAssemble(enc, &webp_data)) {
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fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
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goto End;
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}
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// If there's only one frame, we don't need to handle loop count.
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if (frame_number == 1) {
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loop_count = 0;
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} else if (!loop_compatibility) {
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if (!stored_loop_count) {
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// if no loop-count element is seen, the default is '1' (loop-once)
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// and we need to signal it explicitly in WebP. Note however that
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// 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
|
|
|
|
//------------------------------------------------------------------------------
|