(svn r18718) -Codechange: make a wrapper macro for looping TileAreas

src/map_func.h

@@ -347,6 +347,16 @@ uint DistanceFromEdge(TileIndex); ///< shortest distance from any edge of the ma
 	for (uint var = tile, cur_h = (h); cur_h > 0; --cur_h, var += TileDiffXY(0, 1) - (w)) \
 		for (uint cur_w = (w); cur_w > 0; --cur_w, var++)
 
+/**
+ * A loop which iterates over the tiles of a TileArea
+ *
+ * This macro starts 2 nested loops which iterates over a square of tiles.
+ *
+ * @param var The name of the variable which contains the current tile
+ * @param ta  The tile area to search over
+ */
+#define TILE_AREA_LOOP(var, ta) TILE_LOOP(var, ta.w, ta.h, ta.tile)
+
 /**
  * Convert a DiagDirection to a TileIndexDiff
  *