[libav-commits] fic: Simplify alpha blending

Derek Buitenhuis git at libav.org
Wed Apr 23 17:58:50 CEST 2014


Module: libav
Branch: master
Commit: e299cb2cd37330bf58225d45b06dc179f8dd8dac

Author:    Derek Buitenhuis <derek.buitenhuis at gmail.com>
Committer: Derek Buitenhuis <derek.buitenhuis at gmail.com>
Date:      Tue Apr 22 16:42:11 2014 -0400

fic: Simplify alpha blending

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

---

 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)



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