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lavfi/drawutils: fix blending computation in blend_line function 

If width is not alligned with hsub, background component should only be
multiplied once by sub alpha component.
This commit is contained in:
Matthieu Bouron 2013-01-04 22:08:11 +01:00 committed by Nicolas George
parent f27eb1b702
commit be0a67bd65
1 changed files with 0 additions and 1 deletions
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libavfilter/drawutils.c
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@ -313,7 +313,6 @@ static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
unsigned tau = 0x1010101 - alpha;
int x;
src *= alpha;
if (left) {
unsigned suba = (left * alpha) >> hsub;
*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;