From 1c49d74fad3a996e08a6b96db59ed5179f8aa373 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Wed, 15 Dec 2021 10:26:22 +0100
Subject: [PATCH] avcodec/cdgraphics: unbreak rendering of vertical scrolling

---
 libavcodec/cdgraphics.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/cdgraphics.c b/libavcodec/cdgraphics.c
index 731d800666..c9e265fa53 100644
--- a/libavcodec/cdgraphics.c
+++ b/libavcodec/cdgraphics.c
@@ -218,7 +218,7 @@ static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data,
 
     /// find the difference and save the offset for cdg_tile_block usage
     hinc = h_off - cc->hscroll;
-    vinc = v_off - cc->vscroll;
+    vinc = cc->vscroll - v_off;
     cc->hscroll = h_off;
     cc->vscroll = v_off;