[FFmpeg-cvslog] avcodec/cdgraphics: fix for negative linesize and vertical scrolling

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Tue Sep 26 16:32:58 2023 +0200| [e1530a319ab5e9dfa6715391824d203914323ed5] | committer: Paul B Mahol

avcodec/cdgraphics: fix for negative linesize and vertical scrolling

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e1530a319ab5e9dfa6715391824d203914323ed5
---

 libavcodec/cdgraphics.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/cdgraphics.c b/libavcodec/cdgraphics.c
index 966b255220..f33f7fbf00 100644
--- a/libavcodec/cdgraphics.c
+++ b/libavcodec/cdgraphics.c
@@ -249,11 +249,11 @@ static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data,
     if (vinc > 0)
         cdg_fill_wrapper(0, 0, out,
                          0, CDG_FULL_HEIGHT - vinc, in, color,
-                         stride, vinc, stride, roll_over);
+                         FFABS(stride), vinc, stride, roll_over);
     else if (vinc < 0)
         cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out,
                          0, 0, in, color,
-                         stride, -1 * vinc, stride, roll_over);
+                         FFABS(stride), -1 * vinc, stride, roll_over);
 
     if (hinc > 0)
         cdg_fill_wrapper(0, 0, out,