From fe798488e6c03311cee8328398c7ce5e235f70c8 Mon Sep 17 00:00:00 2001
From: dominik <dominik@openttd.org>
Date: Fri, 7 Jan 2005 12:33:28 +0000
Subject: [PATCH] (svn r1413) Fixed a serious memory leak problem. The
 invisible tiles on the southern border now have the correct tile type
 (MP_VOID) again. Please note that older maps might still have incorrect
 border tiles, thus still causing overflows.

---
 landscape.c | 8 +++++---
 ttd.h       | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/landscape.c b/landscape.c
index ae0913ebec..0971713e82 100644
--- a/landscape.c
+++ b/landscape.c
@@ -84,7 +84,7 @@ void FindLandscapeHeightByTile(TileInfo *ti, uint tile)
 {
 	if (GET_TILE_X(tile) == MapMaxX() || GET_TILE_Y(tile) == MapMaxY()) {
 		ti->tileh = 0;
-		ti->type = MP_STRANGE;
+		ti->type = MP_VOID;
 		ti->tile = 0;
 		ti->map5 = 0;
 		ti->z = 0;
@@ -108,7 +108,7 @@ void FindLandscapeHeight(TileInfo *ti, uint x, uint y)
 
 	if (x >= MapMaxX() * 16 - 1 || y >= MapMaxY() * 16 - 1) {
 		ti->tileh = 0;
-		ti->type = MP_STRANGE;
+		ti->type = MP_VOID;
 		ti->tile = 0;
 		ti->map5 = 0;
 		ti->z = 0;
@@ -495,8 +495,10 @@ void InitializeLandscape()
 	memset(_map_extra_bits, 0, map_size / 4);
 	memset(_map_type_and_height, MP_CLEAR << 4, map_size);
 
+	// create void tiles on the border
 	for (i = 0; i != MapMaxY(); i++)
-		memset(_map_type_and_height + i * MapSizeX(), 0,  MapSizeX() - 1);
+		_map_type_and_height[ i * MapSizeX() + MapMaxY() ] = MP_VOID << 4;
+	memset(_map_type_and_height + MapMaxY() * MapSizeX(), MP_VOID << 4, MapSizeX());
 
 	memset(_map5, 3, map_size);
 }
diff --git a/ttd.h b/ttd.h
index 44a685ee6c..646f3a9444 100644
--- a/ttd.h
+++ b/ttd.h
@@ -91,7 +91,7 @@ enum MapTileTypes {
 	MP_TREES,
 	MP_STATION,
 	MP_WATER,
-	MP_STRANGE,
+	MP_VOID, // invisible tiles at the SW and SE border
 	MP_INDUSTRY,
 	MP_TUNNELBRIDGE,
 	MP_UNMOVABLE