From 8c138523731f38af4143fc3a447ed5ee29cf5035 Mon Sep 17 00:00:00 2001
From: glx <glx@openttd.org>
Date: Tue, 15 Jan 2008 00:03:48 +0000
Subject: (svn r11855) -Fix [FS#1335]: recompute town population when removing
 a 'newhouses' grf, or when loading a game with missing 'newhouses' grfs

---
 src/newgrf_house.cpp | 24 +++++++-----------------
 src/newgrf_house.h   |  1 -
 src/openttd.cpp      |  4 ++--
 src/town_cmd.cpp     |  5 ++---
 4 files changed, 11 insertions(+), 23 deletions(-)

(limited to 'src')

diff --git a/src/newgrf_house.cpp b/src/newgrf_house.cpp
index 5f7adedf8..31aa4e972 100644
--- a/src/newgrf_house.cpp
+++ b/src/newgrf_house.cpp
@@ -33,8 +33,12 @@ HouseOverrideManager _house_mngr(NEW_HOUSE_OFFSET, HOUSE_MAX, INVALID_HOUSE_ID);
 
 void CheckHouseIDs()
 {
+	Town *town;
 	InitializeBuildingCounts();
 
+	/* Reset town population */
+	FOR_ALL_TOWNS(town) town->population = 0;
+
 	for (TileIndex t = 0; t < MapSize(); t++) {
 		HouseID house_id;
 
@@ -47,7 +51,9 @@ void CheckHouseIDs()
 			house_id = _house_mngr.GetSubstituteID(house_id);
 			SetHouseType(t, house_id);
 		}
-		IncreaseBuildingCount(GetTownByTile(t), house_id);
+		town = GetTownByTile(t);
+		IncreaseBuildingCount(town, house_id);
+		if (IsHouseCompleted(t)) town->population += GetHouseSpecs(house_id)->population;
 	}
 }
 
@@ -122,22 +128,6 @@ void DecreaseBuildingCount(Town *t, HouseID house_id)
 	if (_building_counts.class_count[class_id] > 0)   _building_counts.class_count[class_id]--;
 }
 
-/**
- * AfterLoadCountBuildings()
- *
- * After a savegame has been loaded, count the number of buildings on the map.
- */
-void AfterLoadCountBuildings()
-{
-	if (!_loaded_newgrf_features.has_newhouses) return;
-
-	for (TileIndex t = 0; t < MapSize(); t++) {
-		if (!IsTileType(t, MP_HOUSE)) continue;
-		IncreaseBuildingCount(GetTownByTile(t), GetHouseType(t));
-	}
-}
-
-
 static uint32 HouseGetRandomBits(const ResolverObject *object)
 {
 	const TileIndex tile = object->u.house.tile;
diff --git a/src/newgrf_house.h b/src/newgrf_house.h
index ffee181d5..5c70a2cb8 100644
--- a/src/newgrf_house.h
+++ b/src/newgrf_house.h
@@ -33,7 +33,6 @@ HouseClassID AllocateHouseClassID(byte grf_class_id, uint32 grfid);
 void InitializeBuildingCounts();
 void IncreaseBuildingCount(Town *t, HouseID house_id);
 void DecreaseBuildingCount(Town *t, HouseID house_id);
-void AfterLoadCountBuildings();
 
 void DrawNewHouseTile(TileInfo *ti, HouseID house_id);
 void AnimateNewHouseTile(TileIndex tile);
diff --git a/src/openttd.cpp b/src/openttd.cpp
index f53b4a621..2ec5db868 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -2018,8 +2018,8 @@ bool AfterLoadGame()
 		}
 	}
 
-	/* Count the buildings after updating the map array. */
-	AfterLoadCountBuildings();
+	/* Check that house ids are still valid. */
+	CheckHouseIDs();
 
 	if (CheckSavegameVersion(43)) {
 		for (TileIndex t = 0; t < map_size; t++) {
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index e6ee6c208..3bb6b7d9c 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -2411,9 +2411,8 @@ static const SaveLoad _town_desc[] = {
 	SLE_CONDVAR(Town, xy,                    SLE_FILE_U16 | SLE_VAR_U32, 0, 5),
 	SLE_CONDVAR(Town, xy,                    SLE_UINT32,                 6, SL_MAX_VERSION),
 
-	SLE_CONDVAR(Town, population,            SLE_FILE_U16 | SLE_VAR_U32, 0, 2),
-	SLE_CONDVAR(Town, population,            SLE_UINT32,                 3, SL_MAX_VERSION),
-
+	SLE_CONDNULL(2, 0, 2),
+	SLE_CONDNULL(4, 3, 84),
 
 	    SLE_VAR(Town, num_houses,            SLE_UINT16),
 	SLE_CONDVAR(Town, townnamegrfid,         SLE_UINT32, 66, SL_MAX_VERSION),
-- 
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