fix interlaced decoding, original patch from reimar

Originally committed as revision 12349 to svn://svn.ffmpeg.org/ffmpeg/trunk
17 years ago · 30400f0d03
parent 9dc92a38a0
commit 30400f0d03
1 changed files with 2 additions and 5 deletions
--- a/libavcodec/gifdec.c
+++ b/libavcodec/gifdec.c
@ -126,11 +126,8 @@ 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 ? 2 : 4;
+                    ptr = ptr1 + linesize * y1;
                    pass++;
                }
                break;