From de084ace1cb4abc47a4e06d430e36c6860fbd371 Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Thu, 12 Jul 2007 08:10:40 +0000
Subject: (svn r10519) -Fix: when getting a "nearby" tile, make sure you never
 roam outside of the map.

---
 src/newgrf_commons.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/newgrf_commons.cpp')

diff --git a/src/newgrf_commons.cpp b/src/newgrf_commons.cpp
index 2b1873f7a..5d6aa6630 100644
--- a/src/newgrf_commons.cpp
+++ b/src/newgrf_commons.cpp
@@ -265,5 +265,6 @@ TileIndex GetNearbyTile(byte parameter, TileIndex tile)
 	if (x >= 8) x -= 16;
 	if (y >= 8) y -= 16;
 
-	return tile + TileDiffXY(x, y);
+	/* Make sure we never roam outside of the map */
+	return TILE_MASK(tile + TileDiffXY(x, y));
 }
-- 
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