From fd4e6bd031808202d6a3c2495d3c43ce003d2bd0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Janiszewski?=
 <janisozaur@users.noreply.github.com>
Date: Sat, 9 Apr 2022 12:12:34 +0200
Subject: [PATCH] Fix crash after alt-tab (#16070)

---
 src/openrct2/drawing/LightFX.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/openrct2/drawing/LightFX.cpp b/src/openrct2/drawing/LightFX.cpp
index 3b434fac5f..b4ab844e91 100644
--- a/src/openrct2/drawing/LightFX.cpp
+++ b/src/openrct2/drawing/LightFX.cpp
@@ -527,6 +527,10 @@ void lightfx_render_lights_to_frontbuffer()
                 continue;
         }
 
+        // Clamp the reads to be no larger than the buffer size
+        bufReadHeight = std::min<uint32_t>(_pixelInfo.height, bufReadHeight);
+        bufReadWidth = std::min<uint32_t>(_pixelInfo.width, bufReadWidth);
+
         bufWriteX = inRectCentreX - bufReadWidth / 2;
         bufWriteY = inRectCentreY - bufReadHeight / 2;