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-rw-r--r--src/newgrf_house.cpp4
-rw-r--r--src/newgrf_house.h2
-rw-r--r--src/newgrf_spritegroup.h2
3 files changed, 4 insertions, 4 deletions
diff --git a/src/newgrf_house.cpp b/src/newgrf_house.cpp
index 94fc02d1e..4509cbeac 100644
--- a/src/newgrf_house.cpp
+++ b/src/newgrf_house.cpp
@@ -369,7 +369,7 @@ static const SpriteGroup *HouseResolveReal(const ResolverObject *object, const R
*
* Returns a resolver object to be used with feature 07 spritegroups.
*/
-static void NewHouseResolver(ResolverObject *res, HouseID house_id, TileIndex tile, Town *town)
+static void NewHouseResolver(ResolverObject *res, HouseID house_id, TileIndex tile, const Town *town)
{
res->GetRandomBits = HouseGetRandomBits;
res->GetTriggers = HouseGetTriggers;
@@ -394,7 +394,7 @@ static void NewHouseResolver(ResolverObject *res, HouseID house_id, TileIndex ti
res->grffile = (hs != NULL ? hs->grf_prop.grffile : NULL);
}
-uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, Town *town, TileIndex tile, bool not_yet_constructed, uint8 initial_random_bits)
+uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, const Town *town, TileIndex tile, bool not_yet_constructed, uint8 initial_random_bits)
{
ResolverObject object;
const SpriteGroup *group;
diff --git a/src/newgrf_house.h b/src/newgrf_house.h
index 7a5fc05b8..7a2b00acf 100644
--- a/src/newgrf_house.h
+++ b/src/newgrf_house.h
@@ -44,7 +44,7 @@ void DrawNewHouseTile(TileInfo *ti, HouseID house_id);
void AnimateNewHouseTile(TileIndex tile);
void ChangeHouseAnimationFrame(const struct GRFFile *file, TileIndex tile, uint16 callback_result);
-uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, Town *town, TileIndex tile, bool not_yet_constructed = false, uint8 initial_random_bits = 0);
+uint16 GetHouseCallback(CallbackID callback, uint32 param1, uint32 param2, HouseID house_id, const Town *town, TileIndex tile, bool not_yet_constructed = false, uint8 initial_random_bits = 0);
bool CanDeleteHouse(TileIndex tile);
diff --git a/src/newgrf_spritegroup.h b/src/newgrf_spritegroup.h
index 7f220f7c5..d61917acf 100644
--- a/src/newgrf_spritegroup.h
+++ b/src/newgrf_spritegroup.h
@@ -321,7 +321,7 @@ struct ResolverObject {
} station;
struct {
TileIndex tile;
- Town *town;
+ const Town *town;
HouseID house_id;
uint16 initial_random_bits; ///< Random bits during construction checks
bool not_yet_constructed; ///< True for construction check