From 628df4d2923b5a42e0378c4ede89178f85e0e0c8 Mon Sep 17 00:00:00 2001
From: aliaspider
Date: Thu, 30 Oct 2014 01:09:02 +0100
Subject: prevent a segfault.

---
 source/tile.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'source/tile.c')

diff --git a/source/tile.c b/source/tile.c
index 38ac831..2211421 100644
--- a/source/tile.c
+++ b/source/tile.c
@@ -467,6 +467,9 @@ static void WRITE_4PIXELS16_ADD(int32 Offset, uint8* Pixels,
                                 uint16* ScreenColors)
 {
    uint8  Pixel, N;
+   if (Offset < 0)
+      Offset = 0;
+
    uint16* Screen = (uint16*) GFX.S + Offset;
    uint8*  Depth = GFX.ZBuffer + Offset;
    uint8*  SubDepth = GFX.SubZBuffer + Offset;
@@ -496,6 +499,9 @@ static void WRITE_4PIXELS16_FLIPPED_ADD(int32 Offset, uint8* Pixels,
                                         uint16* ScreenColors)
 {
    uint8  Pixel, N;
+   if (Offset < 0)
+      Offset = 0;
+
    uint16* Screen = (uint16*) GFX.S + Offset;
    uint8*  Depth = GFX.ZBuffer + Offset;
    uint8*  SubDepth = GFX.SubZBuffer + Offset;
-- 
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