[FFmpeg-cvslog] lavfi/drawutils: fix blending computation in blend_line function
Matthieu Bouron
git at videolan.org
Sat Jan 5 13:21:54 CET 2013
ffmpeg | branch: master | Matthieu Bouron <matthieu.bouron at gmail.com> | Fri Jan 4 22:08:11 2013 +0100| [be0a67bd6508ccff81570a41ebe8169e34012c66] | committer: Nicolas George
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.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=be0a67bd6508ccff81570a41ebe8169e34012c66
---
libavfilter/drawutils.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/libavfilter/drawutils.c b/libavfilter/drawutils.c
index aefd09d..aebc000 100644
--- a/libavfilter/drawutils.c
+++ b/libavfilter/drawutils.c
@@ -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;
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