From fe20c4903cff7a3031f38142ece732c4a663b3fb Mon Sep 17 00:00:00 2001
From: Fabian Greffrath <fabian@greffrath.com>
Date: Mon, 30 Dec 2024 19:24:03 +0100
Subject: [PATCH] do not draw fuzz columns beyond screen boundaries (#2108)

Fixes #2099
---
 src/r_draw.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/r_draw.c b/src/r_draw.c
index efd95e01..647126b7 100644
--- a/src/r_draw.c
+++ b/src/r_draw.c
@@ -488,6 +488,8 @@ static void DrawFuzzColumnBlocky(void)
 
     int lines = fuzzblocksize - (dc_yl % fuzzblocksize);
 
+    const int fuzzblockwidth = MIN(fuzzblocksize, linesize - dc_x);
+
     do
     {
         count -= lines;
@@ -506,7 +508,7 @@ static void DrawFuzzColumnBlocky(void)
 
         do
         {
-            memset(dest, fuzz, fuzzblocksize);
+            memset(dest, fuzz, fuzzblockwidth);
             dest += linesize;
         } while (--lines);
 
@@ -580,6 +582,8 @@ static void DrawFuzzColumnRefraction(void)
 
     int lines = fuzzblocksize - (dc_yl % fuzzblocksize);
 
+    const int fuzzblockwidth = MIN(fuzzblocksize, linesize - dc_x);
+
     int dark = FUZZDARK;
     int offset = 0;
 
@@ -600,7 +604,7 @@ static void DrawFuzzColumnRefraction(void)
 
         do
         {
-            memset(dest, fuzz, fuzzblocksize);
+            memset(dest, fuzz, fuzzblockwidth);
             dest += linesize;
         } while (--lines);