(svn r24180) -Codechange/feature-ish: add cache checker for the town's cache

1 files changed, 36 insertions, 25 deletions

diff --git a/src/saveload/town_sl.cpp b/src/saveload/town_sl.cpp
index 07043bc0a..6edd6ddd3 100644
--- a/src/saveload/town_sl.cpp
+++ b/src/saveload/town_sl.cpp
@@ -13,19 +13,15 @@
 #include "../newgrf_house.h"
 #include "../town.h"
 #include "../landscape.h"
+#include "../subsidy_func.h"
 
 #include "saveload.h"
 #include "newgrf_sl.h"
 
 /**
- * Check and update town and house values.
- *
- * Checked are the HouseIDs. Updated are the
- * town population the number of houses per
- * town, the town radius and the max passengers
- * of the town.
+ * Rebuild all the cached variables of towns.
  */
-void UpdateHousesAndTowns()
+void RebuildTownCaches()
 {
 	Town *town;
 	InitializeBuildingCounts();
@@ -40,6 +36,38 @@ void UpdateHousesAndTowns()
 		if (!IsTileType(t, MP_HOUSE)) continue;
 
 		HouseID house_id = GetCleanHouseType(t);
+		town = Town::GetByTile(t);
+		IncreaseBuildingCount(town, house_id);
+		if (IsHouseCompleted(t)) town->cache.population += HouseSpec::Get(house_id)->population;
+
+		/* Increase the number of houses for every house, but only once. */
+		if (GetHouseNorthPart(house_id) == 0) town->cache.num_houses++;
+	}
+
+	/* Update the population and num_house dependant values */
+	FOR_ALL_TOWNS(town) {
+		UpdateTownRadius(town);
+		UpdateTownCargoes(town);
+	}
+	UpdateTownCargoBitmap();
+
+	RebuildSubsidisedSourceAndDestinationCache();
+}
+
+/**
+ * Check and update town and house values.
+ *
+ * Checked are the HouseIDs. Updated are the
+ * town population the number of houses per
+ * town, the town radius and the max passengers
+ * of the town.
+ */
+void UpdateHousesAndTowns()
+{
+	for (TileIndex t = 0; t < MapSize(); t++) {
+		if (!IsTileType(t, MP_HOUSE)) continue;
+
+		HouseID house_id = GetCleanHouseType(t);
 		if (!HouseSpec::Get(house_id)->enabled && house_id >= NEW_HOUSE_OFFSET) {
 			/* The specs for this type of house are not available any more, so
 			 * replace it with the substitute original house type. */
@@ -82,24 +110,7 @@ void UpdateHousesAndTowns()
 		}
 	}
 
-	for (TileIndex t = 0; t < MapSize(); t++) {
-		if (!IsTileType(t, MP_HOUSE)) continue;
-
-		HouseID house_id = GetCleanHouseType(t);
-		town = Town::GetByTile(t);
-		IncreaseBuildingCount(town, house_id);
-		if (IsHouseCompleted(t)) town->cache.population += HouseSpec::Get(house_id)->population;
-
-		/* Increase the number of houses for every house, but only once. */
-		if (GetHouseNorthPart(house_id) == 0) town->cache.num_houses++;
-	}
-
-	/* Update the population and num_house dependant values */
-	FOR_ALL_TOWNS(town) {
-		UpdateTownRadius(town);
-		UpdateTownCargoes(town);
-	}
-	UpdateTownCargoBitmap();
+	RebuildTownCaches();
 }
 
 /** Save and load of towns. */