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gif2webp: If aligning to even offsets, extra pixels should be transparent

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This is to ensure that the output WebP image is consistent with original
GIF when displayed against any background color.

Change-Id: I14218848153eb40358aa4ce331b2543d2fc2e86c
This commit is contained in:
Urvang Joshi 2013-06-24 15:18:35 -07:00
parent 0bcf5ce39a
commit 54b65108ad
1 changed files with 4 additions and 4 deletions
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8
examples/gif2webp.c
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@ -36,11 +36,11 @@
static int transparent_index = -1; // No transparency by default. static int transparent_index = -1; // No transparency by default.
static void ClearPicture(WebPPicture* const picture, uint32_t color) { static void ClearPicture(WebPPicture* const picture) {
int x, y; int x, y;
for (y = 0; y < picture->height; ++y) { for (y = 0; y < picture->height; ++y) {
uint32_t* const dst = picture->argb + y * picture->argb_stride; uint32_t* const dst = picture->argb + y * picture->argb_stride;
for (x = 0; x < picture->width; ++x) dst[x] = color; for (x = 0; x < picture->width; ++x) dst[x] = TRANSPARENT_COLOR;
} }
} }
@ -296,7 +296,7 @@ int main(int argc, const char *argv[]) {
WebPMemoryWriter memory; WebPMemoryWriter memory;
if (frame.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) { if (frame.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {
ClearPicture(&picture, anim.bgcolor); ClearPicture(&picture);
} }
if (!DGifGetImageDesc(gif)) goto End; if (!DGifGetImageDesc(gif)) goto End;
@ -380,7 +380,7 @@ int main(int argc, const char *argv[]) {
fprintf(stderr, "GIF decode warning: invalid background color " fprintf(stderr, "GIF decode warning: invalid background color "
"index. Assuming white background.\n"); "index. Assuming white background.\n");
} }
ClearPicture(&picture, anim.bgcolor); ClearPicture(&picture);
is_first_frame = 0; is_first_frame = 0;
} }
break; break;