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@ -77,6 +77,23 @@ static inline TileType GetTileType(TileIndex tile)
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return (TileType)GB(_m[tile].type_height, 4, 4);
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}
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/**
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* Check if a tile is within the map (not a border)
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*
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* @param tile The tile to check
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* @return Whether the tile is in the interior of the map
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* @pre tile < MapSize()
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*/
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static inline bool IsInnerTile(TileIndex tile)
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{
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assert(tile < MapSize());
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uint x = TileX(tile);
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uint y = TileY(tile);
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return x < MapMaxX() && y < MapMaxY() && ((x > 0 && y > 0) || !_settings_game.construction.freeform_edges);
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}
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/**
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* Set the type of a tile
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*
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@ -95,7 +112,7 @@ static inline void SetTileType(TileIndex tile, TileType type)
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/* VOID tiles (and no others) are exactly allowed at the lower left and right
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* edges of the map. If _settings_game.construction.freeform_edges is true,
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* the upper edges of the map are also VOID tiles. */
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assert((TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY() || (_settings_game.construction.freeform_edges && (TileX(tile) == 0 || TileY(tile) == 0))) == (type == MP_VOID));
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assert(IsInnerTile(tile) == (type != MP_VOID));
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SB(_m[tile].type_height, 4, 4, type);
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}
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