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(svn r25849) -Codechange: Introduce IsTileFlat to not compute full slope information for situations when we only want to know if a tile is flat or not (cirdan, LordAro)

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zuu
2013-10-12 22:07:58 +00:00
parent b35b8aa5bb
commit dfb5663313
11 changed files with 51 additions and 27 deletions
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24
src/tile_map.cpp
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@@ -58,6 +58,30 @@ Slope GetTileSlope(TileIndex tile, int *h)
return (Slope)r;
}
/**
* Check if a given tile is flat
* @param tile Tile to check
* @param h If not \c NULL, pointer to storage of z height (only if tile is flat)
* @return Whether the tile is flat
*/
bool IsTileFlat(TileIndex tile, int *h)
{
assert(tile < MapSize());
if (!IsInnerTile(tile)) {
if (h != NULL) *h = TileHeight(tile);
return true;
}
uint z = TileHeight(tile);
if (TileHeight(tile + TileDiffXY(1, 0)) != z) return false;
if (TileHeight(tile + TileDiffXY(0, 1)) != z) return false;
if (TileHeight(tile + TileDiffXY(1, 1)) != z) return false;
if (h != NULL) *h = z;
return true;
}
/**
* Get bottom height of the tile
* @param tile Tile to compute height of