avcodec/cdgraphics: fix for negative linesize and vertical scrolling

1 year ago · e1530a319a
parent 8fa83ad70f
commit e1530a319a
1 changed files with 2 additions and 2 deletions
--- 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,