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Fix a disposal flag mistype.

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Only clear to background color if index is non-zero.
Fixed a the disposal test gif I was using - now renders properly (gif has no transparent set, but all renderers still considered it transparent.  Spec says 0 should be ignored if 0, but was confusing by saying it only in the context of the pal not existing.. but seems to be the case always.
This commit is contained in:
Chris Forseth 2017-11-27 23:32:44 -06:00
parent 28c28b0bd2
commit 03b4bbc5d2
1 changed files with 2 additions and 2 deletions
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4
stb_image.h
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@ -6309,7 +6309,7 @@ static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, i
dispose = (g->eflags & 0x1C) >> 2;
pcount = g->w * g->h;
if ((dispose == 4) && (two_back == 0)) {
if ((dispose == 3) && (two_back == 0)) {
dispose = 2; // if I don't have an image to revert back to, default to the old background
}
@ -6386,7 +6386,7 @@ static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, i
// if this was the first frame,
pcount = g->w * g->h;
if (first_frame && (g->bgindex >= 0)) {
if (first_frame && (g->bgindex > 0)) {
// if first frame, any pixel not drawn to gets the background color
for (pi = 0; pi < pcount; ++pi) {
if (g->history[pi] == 0) {