(svn r24714) -Fix [FS#5337]: [NewGRF] Draw default foundations if resolving of custom station foundation sprites fails.

src/newgrf_station.cpp

@@ -630,7 +630,7 @@ SpriteID GetCustomStationRelocation(const StationSpec *statspec, BaseStation *st
  * @param tile Station tile being drawn
  * @param layout Spritelayout as returned by previous callback
  * @param edge_info Information about northern tile edges; whether they need foundations or merge into adjacent tile's foundations.
- * @return First sprite of a set of foundation sprites for various slopes.
+ * @return First sprite of a set of foundation sprites for various slopes, or 0 if default foundations shall be drawn.
  */
 SpriteID GetCustomStationFoundationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint layout, uint edge_info)
 {

src/station_cmd.cpp

@@ -2652,6 +2652,7 @@ static void DrawTile_Station(TileInfo *ti)
 			if (!HasFoundationNW(ti->tile, slope, z)) SetBit(edge_info, 0);
 			if (!HasFoundationNE(ti->tile, slope, z)) SetBit(edge_info, 1);
 			SpriteID image = GetCustomStationFoundationRelocation(statspec, st, ti->tile, tile_layout, edge_info);
+			if (image == 0) goto draw_default_foundation;
 
 			if (HasBit(statspec->flags, SSF_EXTENDED_FOUNDATIONS)) {
 				/* Station provides extended foundations. */