From b5ff5e22e95f6ad05c05a7ffad3d009b33227689 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Mon, 21 Apr 2003 22:37:39 +0000
Subject: [PATCH] rgb555 alpha extraction fix

Originally committed as revision 1810 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/imgconvert.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/imgconvert.c b/libavcodec/imgconvert.c
index 7bbceeff9a..01c0415f81 100644
--- a/libavcodec/imgconvert.c
+++ b/libavcodec/imgconvert.c
@@ -1104,7 +1104,7 @@ static inline unsigned int bitcopy_n(unsigned int a, int n)
     r = bitcopy_n(v >> (10 - 3), 3);\
     g = bitcopy_n(v >> (5 - 3), 3);\
     b = bitcopy_n(v << 3, 3);\
-    a = bitcopy_n(v >> 15, 7);\
+    a = (-(v >> 15)) & 0xff;\
 }
 
 #define RGBA_OUT(d, r, g, b, a)\