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Merge "Make sure we reach the full range for alpha blending."

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Pascal Massimino 2017-10-09 09:21:21 +00:00 committed by Gerrit Code Review
commit 0827570873
1 changed files with 2 additions and 2 deletions
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src/enc/picture_tools_enc.c
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@ -191,9 +191,9 @@ void WebPCleanupTransparentAreaLossless(WebPPicture* const pic) {
// Blend color and remove transparency info
#define BLEND(V0, V1, ALPHA) \
((((V0) * (255 - (ALPHA)) + (V1) * (ALPHA)) * 0x101) >> 16)
((((V0) * (255 - (ALPHA)) + (V1) * (ALPHA)) * 0x101 + 256) >> 16)
#define BLEND_10BIT(V0, V1, ALPHA) \
((((V0) * (1020 - (ALPHA)) + (V1) * (ALPHA)) * 0x101) >> 18)
((((V0) * (1020 - (ALPHA)) + (V1) * (ALPHA)) * 0x101 + 1024) >> 18)
void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb) {
const int red = (background_rgb >> 16) & 0xff;