Merge commit '02de44073a8e116ea177b53081219d32ef135ad8' into release/1.1

* commit '02de44073a8e116ea177b53081219d32ef135ad8':
  gifdec: refactor interleave end handling

Merged-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 10 deletions

diff --git a/libavcodec/gifdec.c b/libavcodec/gifdec.c
index 09a6d74075..0b66d06712 100644
--- a/libavcodec/gifdec.c
+++ b/libavcodec/gifdec.c
@@ -256,26 +256,21 @@ static int gif_read_image(GifState *s)
             case 1:
                 y1 += 8;
                 ptr += linesize * 8;
-                if (y1 >= height) {
-                    y1 = pass ? 2 : 4;
-                    ptr = ptr1 + linesize * y1;
-                    pass++;
-                }
                 break;
             case 2:
                 y1 += 4;
                 ptr += linesize * 4;
-                if (y1 >= height) {
-                    y1 = 1;
-                    ptr = ptr1 + linesize;
-                    pass++;
-                }
                 break;
             case 3:
                 y1 += 2;
                 ptr += linesize * 2;
                 break;
             }
+            while (y1 >= height) {
+                y1  = 4 >> pass;
+                ptr = ptr1 + linesize * y1;
+                pass++;
+            }
         } else {
             ptr += linesize;
         }