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gif2webp: handle 1-frame case properly + fix anim_diff

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follow-up to commit b4e046778

Change-Id: I3c7617d09682262ca7929e6a3e56777b163cce45
This commit is contained in:
Pascal Massimino
2017-09-20 14:08:31 -07:00
parent c7f295d30c
commit 3c74c645ca
2 changed files with 22 additions and 10 deletions
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20
examples/gif2webp.c
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@ -106,7 +106,7 @@ int main(int argc, const char *argv[]) {
WebPAnimEncoderOptions enc_options;
WebPConfig config;
int is_first_frame = 1; // Whether we are processing the first frame.
int frame_number = 0; // Whether we are processing the first frame.
int done;
int c;
int quiet = 0;
@ -282,7 +282,7 @@ int main(int argc, const char *argv[]) {
if (!DGifGetImageDesc(gif)) goto End;
if (is_first_frame) {
if (frame_number == 0) {
if (verbose) {
printf("Canvas screen: %d x %d\n", gif->SWidth, gif->SHeight);
}
@ -324,7 +324,6 @@ int main(int argc, const char *argv[]) {
"a memory error.\n");
goto End;
}
is_first_frame = 0;
}
// Some even more broken GIF can have sub-rect with zero width/height.
@ -341,7 +340,11 @@ int main(int argc, const char *argv[]) {
GIFBlendFrames(&frame, &gif_rect, &curr_canvas);
if (!WebPAnimEncoderAdd(enc, &curr_canvas, frame_timestamp, &config)) {
fprintf(stderr, "%s\n", WebPAnimEncoderGetError(enc));
fprintf(stderr, "Error while adding frame #%d: %s\n", frame_number,
WebPAnimEncoderGetError(enc));
goto End;
} else {
++frame_number;
}
// Update canvases.
@ -451,9 +454,12 @@ int main(int argc, const char *argv[]) {
if (!loop_compatibility) {
if (!stored_loop_count) {
// if no loop-count element is seen, the default is '1' (loop-once)
// and we need to signal it explicitly in WebP.
stored_loop_count = 1;
loop_count = 1;
// and we need to signal it explicitly in WebP. Note however that
// in case there's a single frame, we still don't need to store it.
if (frame_number > 1) {
stored_loop_count = 1;
loop_count = 1;
}
} else if (loop_count > 0) {
// adapt GIF's semantic to WebP's (except in the infinite-loop case)
loop_count += 1;