From c27516003fb01b7e0cde9d5bbe4f2cbb747005ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Schieli?= <cschieli@gmail.com>
Date: Fri, 27 Feb 2009 22:23:20 +0000
Subject: [PATCH] Add an isALPHA macro to check if pixel format has alpha
 channel

Originally committed as revision 28747 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
---
 libswscale/swscale_internal.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index cf157428b3..cdf3754d14 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -273,6 +273,13 @@ const char *sws_format_name(int format);
         || (x)==PIX_FMT_MONOBLACK   \
         || (x)==PIX_FMT_MONOWHITE   \
     )
+#define isALPHA(x)      (           \
+           (x)==PIX_FMT_BGR32       \
+        || (x)==PIX_FMT_BGR32_1     \
+        || (x)==PIX_FMT_RGB32       \
+        || (x)==PIX_FMT_RGB32_1     \
+        || (x)==PIX_FMT_YUVA420P    \
+    )
 
 static inline int fmt_depth(int fmt)
 {