[FFmpeg-cvslog] r21947 - trunk/libavcodec/mathops.h

[mru]

Author: mru
Date: Sun Feb 21 22:48:37 2010
New Revision: 21947

Log:
Add zero_extend() function

Modified:
   trunk/libavcodec/mathops.h

Modified: trunk/libavcodec/mathops.h
==============================================================================
--- trunk/libavcodec/mathops.h	Sun Feb 21 21:47:10 2010	(r21946)
+++ trunk/libavcodec/mathops.h	Sun Feb 21 22:48:37 2010	(r21947)
@@ -122,6 +122,13 @@ static inline av_const int sign_extend(i
 }
 #endif
 
+#ifndef zero_extend
+static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
+{
+    return (val << (INT_BIT - bits)) >> (INT_BIT - bits);
+}
+#endif
+
 #ifndef COPY3_IF_LT
 #define COPY3_IF_LT(x, y, a, b, c, d)\
 if ((y) < (x)) {\