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make alpha-detection loop in IsKeyFrame() in good x/y order

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Change-Id: Ifeeb855e66c7b6b849e8584787dc24e7371b1e67
This commit is contained in:
Pascal Massimino 2014-06-24 20:20:29 +00:00 committed by James Zern
parent b8b596f6c3
commit 9d5629025c
1 changed files with 4 additions and 4 deletions
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8
examples/gif2webp_util.c
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@ -166,10 +166,10 @@ static int IsKeyFrame(const WebPPicture* const curr,
// 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) {
for (j = 0; j < prev->height; ++j) {
const uint32_t* const row = &prev->argb[j * prev->argb_stride];
for (i = 0; i < prev->width; ++i) {
if (row[i] & 0xff000000u) { // has alpha?
is_key_frame = 0;
break;
}