From e7a5e2f6266903b797cf01d34b7f93eb39ccc855 Mon Sep 17 00:00:00 2001
From: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Date: Mon, 3 Mar 2008 13:16:29 +0000
Subject: Fix decoding of interlaced gif, e.g.
 http://samples.mplayerhq.hu/GIF/7up.gif

Originally committed as revision 12297 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/gifdec.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/libavformat/gifdec.c b/libavformat/gifdec.c
index 5803e5e5dc..82a80c8dcf 100644
--- a/libavformat/gifdec.c
+++ b/libavformat/gifdec.c
@@ -364,11 +364,8 @@ static int gif_read_image(GifState *s)
                 y1 += 8;
                 ptr += linesize * 8;
                 if (y1 >= height) {
-                    y1 = 4;
-                    if (pass == 0)
-                        ptr = ptr1 + linesize * 4;
-                    else
-                        ptr = ptr1 + linesize * 2;
+                    y1 = pass == 0 ? 4 : 2;
+                    ptr = ptr1 + linesize * y1;
                     pass++;
                 }
                 break;
-- 
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