Built SDL2_image and _mixer static
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317
libsdl2_image/external/libwebp-1.0.2/examples/anim_diff.c
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317
libsdl2_image/external/libwebp-1.0.2/examples/anim_diff.c
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// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Checks if given pair of animated GIF/WebP images are identical:
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// That is: their reconstructed canvases match pixel-by-pixel and their other
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// animation properties (loop count etc) also match.
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//
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// example: anim_diff foo.gif bar.webp
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#include <assert.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h> // for 'strtod'.
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#include <string.h> // for 'strcmp'.
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#include "./anim_util.h"
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#include "./example_util.h"
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#include "./unicode.h"
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#if defined(_MSC_VER) && _MSC_VER < 1900
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#define snprintf _snprintf
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#endif
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// Returns true if 'a + b' will overflow.
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static int AdditionWillOverflow(int a, int b) {
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return (b > 0) && (a > INT_MAX - b);
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}
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static int FramesAreEqual(const uint8_t* const rgba1,
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const uint8_t* const rgba2, int width, int height) {
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const int stride = width * 4; // Always true for 'DecodedFrame.rgba'.
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return !memcmp(rgba1, rgba2, stride * height);
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}
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static WEBP_INLINE int PixelsAreSimilar(uint32_t src, uint32_t dst,
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int max_allowed_diff) {
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const int src_a = (src >> 24) & 0xff;
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const int src_r = (src >> 16) & 0xff;
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const int src_g = (src >> 8) & 0xff;
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const int src_b = (src >> 0) & 0xff;
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const int dst_a = (dst >> 24) & 0xff;
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const int dst_r = (dst >> 16) & 0xff;
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const int dst_g = (dst >> 8) & 0xff;
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const int dst_b = (dst >> 0) & 0xff;
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return (abs(src_r * src_a - dst_r * dst_a) <= (max_allowed_diff * 255)) &&
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(abs(src_g * src_a - dst_g * dst_a) <= (max_allowed_diff * 255)) &&
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(abs(src_b * src_a - dst_b * dst_a) <= (max_allowed_diff * 255)) &&
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(abs(src_a - dst_a) <= max_allowed_diff);
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}
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static int FramesAreSimilar(const uint8_t* const rgba1,
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const uint8_t* const rgba2,
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int width, int height, int max_allowed_diff) {
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int i, j;
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assert(max_allowed_diff > 0);
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for (j = 0; j < height; ++j) {
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for (i = 0; i < width; ++i) {
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const int stride = width * 4;
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const size_t offset = j * stride + i;
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if (!PixelsAreSimilar(rgba1[offset], rgba2[offset], max_allowed_diff)) {
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return 0;
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}
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}
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}
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return 1;
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}
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// Minimize number of frames by combining successive frames that have at max
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// 'max_diff' difference per channel between corresponding pixels.
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static void MinimizeAnimationFrames(AnimatedImage* const img, int max_diff) {
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uint32_t i;
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for (i = 1; i < img->num_frames; ++i) {
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DecodedFrame* const frame1 = &img->frames[i - 1];
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DecodedFrame* const frame2 = &img->frames[i];
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const uint8_t* const rgba1 = frame1->rgba;
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const uint8_t* const rgba2 = frame2->rgba;
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int should_merge_frames = 0;
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// If merging frames will result in integer overflow for 'duration',
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// skip merging.
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if (AdditionWillOverflow(frame1->duration, frame2->duration)) continue;
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if (max_diff > 0) {
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should_merge_frames = FramesAreSimilar(rgba1, rgba2, img->canvas_width,
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img->canvas_height, max_diff);
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} else {
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should_merge_frames =
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FramesAreEqual(rgba1, rgba2, img->canvas_width, img->canvas_height);
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}
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if (should_merge_frames) { // Merge 'i+1'th frame into 'i'th frame.
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frame1->duration += frame2->duration;
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if (i + 1 < img->num_frames) {
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memmove(&img->frames[i], &img->frames[i + 1],
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(img->num_frames - i - 1) * sizeof(*img->frames));
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}
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--img->num_frames;
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--i;
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}
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}
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}
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static int CompareValues(uint32_t a, uint32_t b, const char* output_str) {
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if (a != b) {
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fprintf(stderr, "%s: %d vs %d\n", output_str, a, b);
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return 0;
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}
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return 1;
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}
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static int CompareBackgroundColor(uint32_t bg1, uint32_t bg2, int premultiply) {
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if (premultiply) {
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const int alpha1 = (bg1 >> 24) & 0xff;
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const int alpha2 = (bg2 >> 24) & 0xff;
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if (alpha1 == 0 && alpha2 == 0) return 1;
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}
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if (bg1 != bg2) {
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fprintf(stderr, "Background color mismatch: 0x%08x vs 0x%08x\n",
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bg1, bg2);
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return 0;
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}
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return 1;
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}
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// Note: As long as frame durations and reconstructed frames are identical, it
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// is OK for other aspects like offsets, dispose/blend method to vary.
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static int CompareAnimatedImagePair(const AnimatedImage* const img1,
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const AnimatedImage* const img2,
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int premultiply,
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double min_psnr) {
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int ok = 1;
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const int is_multi_frame_image = (img1->num_frames > 1);
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uint32_t i;
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ok = CompareValues(img1->canvas_width, img2->canvas_width,
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"Canvas width mismatch") && ok;
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ok = CompareValues(img1->canvas_height, img2->canvas_height,
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"Canvas height mismatch") && ok;
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ok = CompareValues(img1->num_frames, img2->num_frames,
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"Frame count mismatch") && ok;
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if (!ok) return 0; // These are fatal failures, can't proceed.
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if (is_multi_frame_image) { // Checks relevant for multi-frame images only.
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int max_loop_count_workaround = 0;
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// Transcodes to webp increase the gif loop count by 1 for compatibility.
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// When the gif has the maximum value the webp value will be off by one.
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if ((img1->format == ANIM_GIF && img1->loop_count == 65536 &&
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img2->format == ANIM_WEBP && img2->loop_count == 65535) ||
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(img1->format == ANIM_WEBP && img1->loop_count == 65535 &&
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img2->format == ANIM_GIF && img2->loop_count == 65536)) {
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max_loop_count_workaround = 1;
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}
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ok = (max_loop_count_workaround ||
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CompareValues(img1->loop_count, img2->loop_count,
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"Loop count mismatch")) && ok;
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ok = CompareBackgroundColor(img1->bgcolor, img2->bgcolor,
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premultiply) && ok;
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}
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for (i = 0; i < img1->num_frames; ++i) {
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// Pixel-by-pixel comparison.
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const uint8_t* const rgba1 = img1->frames[i].rgba;
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const uint8_t* const rgba2 = img2->frames[i].rgba;
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int max_diff;
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double psnr;
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if (is_multi_frame_image) { // Check relevant for multi-frame images only.
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const char format[] = "Frame #%d, duration mismatch";
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char tmp[sizeof(format) + 8];
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ok = ok && (snprintf(tmp, sizeof(tmp), format, i) >= 0);
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ok = ok && CompareValues(img1->frames[i].duration,
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img2->frames[i].duration, tmp);
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}
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GetDiffAndPSNR(rgba1, rgba2, img1->canvas_width, img1->canvas_height,
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premultiply, &max_diff, &psnr);
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if (min_psnr > 0.) {
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if (psnr < min_psnr) {
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fprintf(stderr, "Frame #%d, psnr = %.2lf (min_psnr = %f)\n", i,
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psnr, min_psnr);
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ok = 0;
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}
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} else {
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if (max_diff != 0) {
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fprintf(stderr, "Frame #%d, max pixel diff: %d\n", i, max_diff);
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ok = 0;
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}
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}
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}
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return ok;
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}
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static void Help(void) {
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printf("Usage: anim_diff <image1> <image2> [options]\n");
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printf("\nOptions:\n");
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printf(" -dump_frames <folder> dump decoded frames in PAM format\n");
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printf(" -min_psnr <float> ... minimum per-frame PSNR\n");
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printf(" -raw_comparison ..... if this flag is not used, RGB is\n");
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printf(" premultiplied before comparison\n");
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printf(" -max_diff <int> ..... maximum allowed difference per channel\n"
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" between corresponding pixels in subsequent\n"
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" frames\n");
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printf(" -h .................. this help\n");
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printf(" -version ............ print version number and exit\n");
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}
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int main(int argc, const char* argv[]) {
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int return_code = -1;
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int dump_frames = 0;
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const char* dump_folder = NULL;
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double min_psnr = 0.;
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int got_input1 = 0;
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int got_input2 = 0;
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int premultiply = 1;
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int max_diff = 0;
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int i, c;
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const char* files[2] = { NULL, NULL };
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AnimatedImage images[2];
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INIT_WARGV(argc, argv);
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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], "-dump_frames")) {
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if (c < argc - 1) {
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dump_frames = 1;
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dump_folder = (const char*)GET_WARGV(argv, ++c);
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} else {
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parse_error = 1;
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}
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} else if (!strcmp(argv[c], "-min_psnr")) {
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if (c < argc - 1) {
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min_psnr = ExUtilGetFloat(argv[++c], &parse_error);
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} else {
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parse_error = 1;
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}
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} else if (!strcmp(argv[c], "-raw_comparison")) {
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premultiply = 0;
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} else if (!strcmp(argv[c], "-max_diff")) {
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if (c < argc - 1) {
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max_diff = ExUtilGetInt(argv[++c], 0, &parse_error);
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} else {
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parse_error = 1;
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}
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} else 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], "-version")) {
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int dec_version, demux_version;
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GetAnimatedImageVersions(&dec_version, &demux_version);
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printf("WebP Decoder version: %d.%d.%d\nWebP Demux version: %d.%d.%d\n",
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(dec_version >> 16) & 0xff, (dec_version >> 8) & 0xff,
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(dec_version >> 0) & 0xff,
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(demux_version >> 16) & 0xff, (demux_version >> 8) & 0xff,
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(demux_version >> 0) & 0xff);
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FREE_WARGV_AND_RETURN(0);
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} else {
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if (!got_input1) {
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files[0] = (const char*)GET_WARGV(argv, c);
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got_input1 = 1;
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} else if (!got_input2) {
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files[1] = (const char*)GET_WARGV(argv, c);
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got_input2 = 1;
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} else {
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parse_error = 1;
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}
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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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if (argc < 3) {
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Help();
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FREE_WARGV_AND_RETURN(-1);
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}
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if (!got_input2) {
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Help();
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FREE_WARGV_AND_RETURN(-1);
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}
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if (dump_frames) {
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WPRINTF("Dumping decoded frames in: %s\n", (const W_CHAR*)dump_folder);
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}
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memset(images, 0, sizeof(images));
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for (i = 0; i < 2; ++i) {
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WPRINTF("Decoding file: %s\n", (const W_CHAR*)files[i]);
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if (!ReadAnimatedImage(files[i], &images[i], dump_frames, dump_folder)) {
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WFPRINTF(stderr, "Error decoding file: %s\n Aborting.\n",
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(const W_CHAR*)files[i]);
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return_code = -2;
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goto End;
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} else {
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MinimizeAnimationFrames(&images[i], max_diff);
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}
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}
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if (!CompareAnimatedImagePair(&images[0], &images[1],
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premultiply, min_psnr)) {
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WFPRINTF(stderr, "\nFiles %s and %s differ.\n", (const W_CHAR*)files[0],
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(const W_CHAR*)files[1]);
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return_code = -3;
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} else {
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WPRINTF("\nFiles %s and %s are identical.\n", (const W_CHAR*)files[0],
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(const W_CHAR*)files[1]);
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return_code = 0;
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}
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End:
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ClearAnimatedImage(&images[0]);
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ClearAnimatedImage(&images[1]);
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FREE_WARGV_AND_RETURN(return_code);
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}
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