--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tile_map.h	Tue Jan 22 21:00:30 2008 +0000
@@ -0,0 +1,192 @@
+/* $Id$ */
+
+/** @file tile_map.h Map writing/reading functions for tiles. */
+
+#ifndef TILE_MAP_H
+#define TILE_MAP_H
+
+#include "tile_type.h"
+#include "slope_type.h"
+#include "player_type.h"
+#include "map_func.h"
+#include "core/bitmath_func.hpp"
+
+/**
+ * Returns the height of a tile
+ *
+ * This function returns the height of the northern corner of a tile.
+ * This is saved in the global map-array. It does not take affect by
+ * any slope-data of the tile.
+ *
+ * @param tile The tile to get the height from
+ * @return the height of the tile
+ * @pre tile < MapSize()
+ */
+static inline uint TileHeight(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return GB(_m[tile].type_height, 0, 4);
+}
+
+/**
+ * Sets the height of a tile.
+ *
+ * This function sets the height of the northern corner of a tile.
+ *
+ * @param tile The tile to change the height
+ * @param height The new height value of the tile
+ * @pre tile < MapSize()
+ * @pre heigth <= MAX_TILE_HEIGHT
+ */
+static inline void SetTileHeight(TileIndex tile, uint height)
+{
+	assert(tile < MapSize());
+	assert(height <= MAX_TILE_HEIGHT);
+	SB(_m[tile].type_height, 0, 4, height);
+}
+
+/**
+ * Returns the height of a tile in pixels.
+ *
+ * This function returns the height of the northern corner of a tile in pixels.
+ *
+ * @param tile The tile to get the height
+ * @return The height of the tile in pixel
+ */
+static inline uint TilePixelHeight(TileIndex tile)
+{
+	return TileHeight(tile) * TILE_HEIGHT;
+}
+
+/**
+ * Get the tiletype of a given tile.
+ *
+ * @param tile The tile to get the TileType
+ * @return The tiletype of the tile
+ * @pre tile < MapSize()
+ */
+static inline TileType GetTileType(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return (TileType)GB(_m[tile].type_height, 4, 4);
+}
+
+/**
+ * Set the type of a tile
+ *
+ * This functions sets the type of a tile. If the type
+ * MP_VOID is selected the tile must be at the south-west or
+ * south-east edges of the map and vice versa.
+ *
+ * @param tile The tile to save the new type
+ * @param type The type to save
+ * @pre tile < MapSize()
+ * @pre type MP_VOID <=> tile is on the south-east or south-west edge.
+ */
+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);
+}
+
+/**
+ * Checks if a tile is a give tiletype.
+ *
+ * This function checks if a tile got the given tiletype.
+ *
+ * @param tile The tile to check
+ * @param type The type to check agains
+ * @return true If the type matches agains the type of the tile
+ */
+static inline bool IsTileType(TileIndex tile, TileType type)
+{
+	return GetTileType(tile) == type;
+}
+
+/**
+ * Returns the owner of a tile
+ *
+ * This function returns the owner of a tile. This cannot used
+ * for tiles which type is one of MP_HOUSE, MP_VOID and MP_INDUSTRY
+ * as no player owned any of these buildings.
+ *
+ * @param tile The tile to check
+ * @return The owner of the tile
+ * @pre tile < MapSize()
+ * @pre The type of the tile must not be MP_HOUSE, MP_VOID and MP_INDUSTRY
+ */
+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;
+}
+
+/**
+ * Sets the owner of a tile
+ *
+ * This function sets the owner status of a tile. Note that you cannot
+ * set a owner for tiles of type MP_HOUSE, MP_VOID and MP_INDUSTRY.
+ *
+ * @param tile The tile to change the owner status.
+ * @param owner The new owner.
+ * @pre tile < MapSize()
+ * @pre The type of the tile must not be MP_HOUSE, MP_VOID and MP_INDUSTRY
+ */
+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;
+}
+
+/**
+ * Checks if a tile belongs to the given owner
+ *
+ * @param tile The tile to check
+ * @param owner The owner to check agains
+ * @return True if a tile belongs the the given 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].m6, 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].m6, 0, 2);
+}
+
+Slope GetTileSlope(TileIndex tile, uint *h);
+uint GetTileZ(TileIndex tile);
+uint GetTileMaxZ(TileIndex tile);
+
+#endif /* TILE_TYPE_H */