(svn r20625) -Add: AirportTileSpec::GetByTile to simplify accessing the AirportTileSpec

src/newgrf_airporttiles.cpp

@@ -47,6 +47,16 @@ AirportTileOverrideManager _airporttile_mngr(NEW_AIRPORTTILE_OFFSET, NUM_AIRPORT
 	return &AirportTileSpec::tiles[gfx];
 }
 
+/**
+ * Retrieve airport tile spec for the given airport tile.
+ * @param tile The airport tile.
+ * @return A pointer to the corresponding AirportTileSpec.
+ */
+/* static */ const AirportTileSpec *AirportTileSpec::GetByTile(TileIndex tile)
+{
+	return AirportTileSpec::Get(GetAirportGfx(tile));
+}
+
 /**
  * This function initializes the tile array of AirportTileSpec
  */