[FFmpeg-cvslog] fic: Simplify alpha blending

[Derek Buitenhuis]

ffmpeg | branch: master | Derek Buitenhuis <derek.buitenhuis at gmail.com> | Tue Apr 22 16:42:11 2014 -0400| [e299cb2cd37330bf58225d45b06dc179f8dd8dac] | committer: Derek Buitenhuis

fic: Simplify alpha blending

Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e299cb2cd37330bf58225d45b06dc179f8dd8dac
---

 libavcodec/fic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/fic.c b/libavcodec/fic.c
index f5a2ffe..0f9f798 100644
--- a/libavcodec/fic.c
+++ b/libavcodec/fic.c
@@ -195,7 +195,7 @@ static av_always_inline void fic_alpha_blend(uint8_t *dst, uint8_t *src,
     int i;
 
     for (i = 0; i < size; i++)
-        dst[i] = (dst[i] * (256 - alpha[i]) + src[i] * alpha[i]) >> 8;
+        dst[i] += ((src[i] - dst[i]) * alpha[i]) >> 8;
 }
 
 static void fic_draw_cursor(AVCodecContext *avctx, int cur_x, int cur_y)