From 8f34d10cdccc697213795bab55912e0dfb4f376d Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Sun, 6 Feb 2022 15:40:25 +0100
Subject: [PATCH] #136 add some more checks to BltFast

---
 src/ddsurface.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/ddsurface.c b/src/ddsurface.c
index aa592b9..f69ad6f 100644
--- a/src/ddsurface.c
+++ b/src/ddsurface.c
@@ -647,6 +647,12 @@ HRESULT dds_BltFast(
     int dst_x = dwX;
     int dst_y = dwY;
 
+    if (dst_x < 0)
+        dst_x = 0;
+
+    if (dst_y < 0)
+        dst_y = 0;
+
     RECT dst_rect = { dst_x, dst_y, (src_rect.right - src_rect.left) + dst_x, (src_rect.bottom - src_rect.top) + dst_y };
 
     if (dst_rect.left < 0)