From 1e5aa1352998d919c735af97b533e40dcba355c2 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Mon, 8 Jan 2024 13:23:48 +0100
Subject: [PATCH] Default the previous pixel to black if prev < 0.

---
 src/video/vid_cga.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/video/vid_cga.c b/src/video/vid_cga.c
index 07a8dfcdb..f61b85e10 100644
--- a/src/video/vid_cga.c
+++ b/src/video/vid_cga.c
@@ -447,7 +447,10 @@ cga_interpolate(cga_t *cga, int x, int y, int w, int h)
 
             black.color = 0x00000000;
 
-            prev_color.color = buffer32->line[prev][j];
+            if (prev >= 0)
+                prev_color.color = buffer32->line[prev][j];
+            else
+                prev_color.color = 0x00000000;
 
             if (next < (y + h))
                 next_color.color = buffer32->line[next][j];