1 files changed, 121 insertions, 0 deletions
diff --git a/src/tile.h b/src/tile.h
new file mode 100644
index 000000000..97123645f
--- /dev/null
+++ b/src/tile.h
@@ -0,0 +1,121 @@
+/* $Id$ */
+
+#ifndef TILE_H
+#define TILE_H
+
+#include "macros.h"
+#include "map.h"
+#include "slope.h"
+
+typedef enum TileTypes {
+	MP_CLEAR,
+	MP_RAILWAY,
+	MP_STREET,
+	MP_HOUSE,
+	MP_TREES,
+	MP_STATION,
+	MP_WATER,
+	MP_VOID, // invisible tiles at the SW and SE border
+	MP_INDUSTRY,
+	MP_TUNNELBRIDGE,
+	MP_UNMOVABLE,
+} TileType;
+
+typedef enum TropicZones {
+	TROPICZONE_INVALID    = 0,
+	TROPICZONE_DESERT     = 1,
+	TROPICZONE_RAINFOREST = 2,
+} TropicZone;
+
+Slope GetTileSlope(TileIndex tile, uint *h);
+uint GetTileZ(TileIndex tile);
+uint GetTileMaxZ(TileIndex tile);
+
+static inline uint TileHeight(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return GB(_m[tile].type_height, 0, 4);
+}
+
+static inline void SetTileHeight(TileIndex tile, uint height)
+{
+	assert(tile < MapSize());
+	assert(height < 16);
+	SB(_m[tile].type_height, 0, 4, height);
+}
+
+static inline uint TilePixelHeight(TileIndex tile)
+{
+	return TileHeight(tile) * TILE_HEIGHT;
+}
+
+static inline TileType GetTileType(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return (TileType)GB(_m[tile].type_height, 4, 4);
+}
+
+static inline void SetTileType(TileIndex tile, TileType type)
+{
+	assert(tile < MapSize());
+	/* VOID tiles (and no others) are exactly allowed at the lower left and right
+	 * edges of the map */
+	assert((TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) == (type == MP_VOID));
+	SB(_m[tile].type_height, 4, 4, type);
+}
+
+static inline bool IsTileType(TileIndex tile, TileType type)
+{
+	return GetTileType(tile) == type;
+}
+
+
+static inline Owner GetTileOwner(TileIndex tile)
+{
+	assert(tile < MapSize());
+	assert(!IsTileType(tile, MP_HOUSE));
+	assert(!IsTileType(tile, MP_VOID));
+	assert(!IsTileType(tile, MP_INDUSTRY));
+
+	return (Owner)_m[tile].m1;
+}
+
+static inline void SetTileOwner(TileIndex tile, Owner owner)
+{
+	assert(tile < MapSize());
+	assert(!IsTileType(tile, MP_HOUSE));
+	assert(!IsTileType(tile, MP_VOID));
+	assert(!IsTileType(tile, MP_INDUSTRY));
+
+	_m[tile].m1 = owner;
+}
+
+static inline bool IsTileOwner(TileIndex tile, Owner owner)
+{
+	return GetTileOwner(tile) == owner;
+}
+
+/**
+ * Set the tropic zone
+ * @param tile the tile to set the zone of
+ * @param type the new type
+ * @pre assert(tile < MapSize());
+ */
+static inline void SetTropicZone(TileIndex tile, TropicZone type)
+{
+	assert(tile < MapSize());
+	SB(_m[tile].extra, 0, 2, type);
+}
+
+/**
+ * Get the tropic zone
+ * @param tile the tile to get the zone of
+ * @pre assert(tile < MapSize());
+ * @return the zone type
+ */
+static inline TropicZone GetTropicZone(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return (TropicZone)GB(_m[tile].extra, 0, 2);
+}
+#endif /* TILE_H */