avcodec/gif: fix off by one in column offsetting finding

[ffmpeg] / libavcodec / gif.c

diff --git a/libavcodec/gif.c b/libavcodec/gif.c
index db2cee9412eef4f101674e03f679012b38fdda0c..cf5d438a7283ac45b048a273d8fe5a0a87a1315c 100644 (file)
--- a/libavcodec/gif.c
+++ b/libavcodec/gif.c
@@ -108,7 +108,7 @@ static int gif_image_write_image(AVCodecContext *avctx,
         /* skip common columns */
         while (x_start < x_end) {
             int same_column = 1;
-            for (y = y_start; y < y_end; y++) {
+            for (y = y_start; y <= y_end; y++) {
                 if (ref[y*ref_linesize + x_start] != buf[y*linesize + x_start]) {
                     same_column = 0;
                     break;
@@ -120,7 +120,7 @@ static int gif_image_write_image(AVCodecContext *avctx,
         }
         while (x_end > x_start) {
             int same_column = 1;
-            for (y = y_start; y < y_end; y++) {
+            for (y = y_start; y <= y_end; y++) {
                 if (ref[y*ref_linesize + x_end] != buf[y*linesize + x_end]) {
                     same_column = 0;
                     break;