(svn r18860) -Codechange: introduce a wrapper to get an hangar tile from a station

src/ai/api/ai_airport.cpp

@@ -109,7 +109,7 @@
 	if (st->owner != _current_company) return INVALID_TILE;
 	if ((st->facilities & FACIL_AIRPORT) == 0) return INVALID_TILE;
 
-	return ::ToTileIndexDiff(st->GetAirportSpec()->depot_table[0]) + st->airport_tile;
+	return st->GetHangarTile(0);
 }
 
 /* static */ AIAirport::AirportType AIAirport::GetAirportType(TileIndex tile)

src/ai/api/ai_depotlist.cpp

@@ -31,7 +31,7 @@ AIDepotList::AIDepotList(AITile::TransportType transport_type)
 				if (st->owner == ::_current_company) {
 					const AirportSpec *as = st->GetAirportSpec();
 					for (uint i = 0; i < as->nof_depots; i++) {
-						this->AddItem(st->airport_tile + ToTileIndexDiff(as->depot_table[i]));
+						this->AddItem(st->GetHangarTile(i));
 					}
 				}
 			}

src/ai/api/ai_order.cpp

@@ -181,9 +181,8 @@ static const Order *ResolveOrder(VehicleID vehicle_id, AIOrder::OrderPosition or
 			if (v->type != VEH_AIRCRAFT) return ::Depot::Get(order->GetDestination())->xy;
 			/* Aircraft's hangars are referenced by StationID, not DepotID */
 			const Station *st = ::Station::Get(order->GetDestination());
-			const AirportSpec *as = st->GetAirportSpec();
+			if (st->GetAirportSpec()->nof_depots == 0) return INVALID_TILE;
-			if (as == NULL || as->nof_depots == 0) return INVALID_TILE;
+			return st->GetHangarTile(0);
-			return st->airport_tile + ::ToTileIndexDiff(as->depot_table[0]);
 		}
 
 		case OT_GOTO_STATION: {

src/aircraft_cmd.cpp

@@ -334,11 +334,9 @@ CommandCost CmdBuildAircraft(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 		 * of all depots, it is simple */
 		for (uint i = 0;; i++) {
 			const Station *st = Station::GetByTile(tile);
-			const AirportSpec *as = st->GetAirportSpec();
 			const AirportFTAClass *apc = st->Airport();
 
-			assert(i != as->nof_depots);
+			if (st->GetHangarTile(i) == tile) {
-			if (st->airport_tile + ToTileIndexDiff(as->depot_table[i]) == tile) {
 				assert(apc->layout[i].heading == HANGAR);
 				v->pos = apc->layout[i].position;
 				break;

src/station_base.h

@@ -121,11 +121,18 @@ public:
 		return IsRailStationTile(tile) && GetStationIndex(tile) == this->index;
 	}
 
-	/* virtual */ FORCEINLINE bool TileBelongsToAirport(TileIndex tile) const
+	FORCEINLINE bool TileBelongsToAirport(TileIndex tile) const
 	{
 		return IsAirportTile(tile) && GetStationIndex(tile) == this->index;
 	}
 
+	FORCEINLINE TileIndex GetHangarTile(uint hangar_num) const
+	{
+		assert(this->airport_tile != INVALID_TILE);
+		assert(hangar_num < this->GetAirportSpec()->nof_depots);
+		return this->airport_tile + ToTileIndexDiff(this->GetAirportSpec()->depot_table[hangar_num]);
+	}
+
 	/* virtual */ uint32 GetNewGRFVariable(const ResolverObject *object, byte variable, byte parameter, bool *available) const;
 
 	/* virtual */ void GetTileArea(TileArea *ta, StationType type) const;

src/station_cmd.cpp

@@ -66,7 +66,7 @@ bool IsHangar(TileIndex t)
 	const AirportSpec *as = st->GetAirportSpec();
 
 	for (uint i = 0; i < as->nof_depots; i++) {
-		if (st->airport_tile + ToTileIndexDiff(as->depot_table[i]) == t) return true;
+		if (st->GetHangarTile(i) == t) return true;
 	}
 
 	return false;
@@ -2090,7 +2090,7 @@ static CommandCost RemoveAirport(TileIndex tile, DoCommandFlag flags)
 	if (flags & DC_EXEC) {
 		for (uint i = 0; i < as->nof_depots; ++i) {
 			DeleteWindowById(
-				WC_VEHICLE_DEPOT, tile + ToTileIndexDiff(as->depot_table[i])
+				WC_VEHICLE_DEPOT, st->GetHangarTile(i)
 			);
 		}