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img2webp: treat -loop as a no-op w/single images

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or in cases where duplicates have been reduced to one

Change-Id: I145cd61b6792b021617f1234f0ba36e2a3128d84
This commit is contained in:
James Zern 2017-01-24 23:37:36 -08:00
parent b045013970
commit 0d8e05880c
1 changed files with 7 additions and 0 deletions
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7
examples/img2webp.c
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@ -85,10 +85,15 @@ static int ReadImage(const char filename[], WebPPicture* const pic) {
static int SetLoopCount(int loop_count, WebPData* const webp_data) {
int ok = 1;
WebPMuxError err;
uint32_t features;
WebPMuxAnimParams new_params;
WebPMux* const mux = WebPMuxCreate(webp_data, 1);
if (mux == NULL) return 0;
err = WebPMuxGetFeatures(mux, &features);
ok = (err == WEBP_MUX_OK);
if (!ok || !(features & ANIMATION_FLAG)) goto End;
err = WebPMuxGetAnimationParams(mux, &new_params);
ok = (err == WEBP_MUX_OK);
if (ok) {
@ -101,6 +106,8 @@ static int SetLoopCount(int loop_count, WebPData* const webp_data) {
err = WebPMuxAssemble(mux, webp_data);
ok = (err == WEBP_MUX_OK);
}
End:
WebPMuxDelete(mux);
if (!ok) {
fprintf(stderr, "Error during loop-count setting\n");