(svn r11940) -Codechange: Store short filename once per open file instead of once per sprite cache entry. Not all file types need this, but most of the time no sprite cache entry needed it either.
/* $Id$ */
/** @file tile_map.cpp */
#include "stdafx.h"
#include "openttd.h"
#include "tile_map.h"
#include "core/math_func.hpp"
Slope GetTileSlope(TileIndex tile, uint *h)
{
uint a;
uint b;
uint c;
uint d;
uint min;
uint r;
assert(tile < MapSize());
if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) {
if (h != NULL) *h = 0;
return SLOPE_FLAT;
}
min = a = TileHeight(tile);
b = TileHeight(tile + TileDiffXY(1, 0));
if (min > b) min = b;
c = TileHeight(tile + TileDiffXY(0, 1));
if (min > c) min = c;
d = TileHeight(tile + TileDiffXY(1, 1));
if (min > d) min = d;
r = SLOPE_FLAT;
if ((a -= min) != 0) r += (--a << 4) + SLOPE_N;
if ((c -= min) != 0) r += (--c << 4) + SLOPE_E;
if ((d -= min) != 0) r += (--d << 4) + SLOPE_S;
if ((b -= min) != 0) r += (--b << 4) + SLOPE_W;
if (h != NULL) *h = min * TILE_HEIGHT;
return (Slope)r;
}
uint GetTileZ(TileIndex tile)
{
if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) return 0;
uint h = TileHeight(tile);
h = min(h, TileHeight(tile + TileDiffXY(1, 0)));
h = min(h, TileHeight(tile + TileDiffXY(0, 1)));
h = min(h, TileHeight(tile + TileDiffXY(1, 1)));
return h * TILE_HEIGHT;
}
uint GetTileMaxZ(TileIndex t)
{
if (TileX(t) == MapMaxX() || TileY(t) == MapMaxY()) return 0;
uint h = TileHeight(t);
h = max(h, TileHeight(t + TileDiffXY(1, 0)));
h = max(h, TileHeight(t + TileDiffXY(0, 1)));
h = max(h, TileHeight(t + TileDiffXY(1, 1)));
return h * TILE_HEIGHT;
}