From c9defc0fea20dc900c0c6d3f8aac8984b024052f Mon Sep 17 00:00:00 2001
From: tron <tron@openttd.org>
Date: Tue, 9 May 2006 09:56:09 +0000
Subject: (svn r4790) Remove slope magic from EnsureNoVehicleZ() and rename it
 to EnsureNoVehicleOnGround() to make more clear what it does

---
 functions.h        |  3 +--
 rail_cmd.c         |  2 +-
 road_cmd.c         |  2 +-
 tile.h             |  7 -------
 tunnelbridge_cmd.c |  6 +++---
 vehicle.c          | 17 +++--------------
 6 files changed, 9 insertions(+), 28 deletions(-)

diff --git a/functions.h b/functions.h
index 3d47bca61..11730800c 100644
--- a/functions.h
+++ b/functions.h
@@ -193,9 +193,8 @@ bool ScrollWindowTo(int x, int y, Window * w);
 bool ScrollMainWindowToTile(TileIndex tile);
 bool ScrollMainWindowTo(int x, int y);
 void DrawSprite(uint32 img, int x, int y);
-uint GetCorrectTileHeight(TileIndex tile);
 bool EnsureNoVehicle(TileIndex tile);
-bool EnsureNoVehicleZ(TileIndex tile, byte z);
+bool EnsureNoVehicleOnGround(TileIndex tile);
 void MarkAllViewportsDirty(int left, int top, int right, int bottom);
 void ShowCostOrIncomeAnimation(int x, int y, int z, int32 cost);
 void ShowFeederIncomeAnimation(int x, int y, int z, int32 cost);
diff --git a/rail_cmd.c b/rail_cmd.c
index 773c981cd..89a03d047 100644
--- a/rail_cmd.c
+++ b/rail_cmd.c
@@ -349,7 +349,7 @@ int32 CmdRemoveSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||
 					GetRailBitsUnderBridge(tile) != trackbit ||
 					(_current_player != OWNER_WATER && !CheckTileOwnership(tile)) ||
-					!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) {
+					!EnsureNoVehicleOnGround(tile)) {
 				return CMD_ERROR;
 			}
 
diff --git a/road_cmd.c b/road_cmd.c
index e1d7a09a3..52c2df2b2 100644
--- a/road_cmd.c
+++ b/road_cmd.c
@@ -125,7 +125,7 @@ int32 CmdRemoveRoad(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 
 	switch (GetTileType(tile)) {
 		case MP_TUNNELBRIDGE:
-			if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) return CMD_ERROR;
+			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
 
 			if (!IsBridge(tile) ||
 					!IsBridgeMiddle(tile) ||
diff --git a/tile.h b/tile.h
index ebb1bb89a..f4c098cf1 100644
--- a/tile.h
+++ b/tile.h
@@ -32,13 +32,6 @@ Slope GetTileSlope(TileIndex tile, uint *h);
 uint GetTileZ(TileIndex tile);
 uint GetTileMaxZ(TileIndex tile);
 
-static inline bool CorrectZ(Slope tileh)
-{
-	/* tile height must be corrected if the north corner is not raised, but
-	 * any other corner is. These are the cases 1 till 7 */
-	return IS_INT_INSIDE(tileh, 1, 8);
-}
-
 static inline uint TileHeight(TileIndex tile)
 {
 	assert(tile < MapSize());
diff --git a/tunnelbridge_cmd.c b/tunnelbridge_cmd.c
index 3076cc236..bae9977f0 100644
--- a/tunnelbridge_cmd.c
+++ b/tunnelbridge_cmd.c
@@ -608,7 +608,7 @@ static int32 DoClearBridge(TileIndex tile, uint32 flags)
 			int32 cost;
 
 			// check if we own the tile below the bridge..
-			if (_current_player != OWNER_WATER && (!CheckTileOwnership(tile) || !EnsureNoVehicleZ(tile, TilePixelHeight(tile))))
+			if (_current_player != OWNER_WATER && (!CheckTileOwnership(tile) || !EnsureNoVehicleOnGround(tile)))
 				return CMD_ERROR;
 
 			if (GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {
@@ -626,7 +626,7 @@ static int32 DoClearBridge(TileIndex tile, uint32 flags)
 			/* delete canal under bridge */
 
 			// check for vehicles under bridge
-			if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) return CMD_ERROR;
+			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
 
 			if (flags & DC_EXEC) {
 				SetClearUnderBridge(tile);
@@ -752,7 +752,7 @@ int32 DoConvertTunnelBridgeRail(TileIndex tile, RailType totype, bool exec)
 			IsTransportUnderBridge(tile) &&
 			GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {
 		// only check for train under bridge
-		if (!CheckTileOwnership(tile) || !EnsureNoVehicleZ(tile, TilePixelHeight(tile)))
+		if (!CheckTileOwnership(tile) || !EnsureNoVehicleOnGround(tile))
 			return CMD_ERROR;
 
 		if (GetRailType(tile) == totype) return CMD_ERROR;
diff --git a/vehicle.c b/vehicle.c
index 2522bf5e1..a2a4e323a 100644
--- a/vehicle.c
+++ b/vehicle.c
@@ -131,30 +131,19 @@ static void *EnsureNoVehicleProcZ(Vehicle *v, void *data)
 	const TileInfo *ti = data;
 
 	if (v->tile != ti->tile || v->type == VEH_Disaster) return NULL;
-	if (!IS_INT_INSIDE(ti->z - v->z_pos, 0, TILE_HEIGHT + 1)) return NULL;
+	if (v->z_pos > ti->z) return NULL;
 
 	VehicleInTheWayErrMsg(v);
 	return v;
 }
 
-static inline uint Correct_Z(Slope tileh)
-{
-	// needs z correction for slope-type graphics that have the NORTHERN tile lowered
-	return CorrectZ(tileh) ? TILE_HEIGHT : 0;
-}
-
-uint GetCorrectTileHeight(TileIndex tile)
-{
-	return Correct_Z(GetTileSlope(tile, NULL));
-}
 
-bool EnsureNoVehicleZ(TileIndex tile, byte z)
+bool EnsureNoVehicleOnGround(TileIndex tile)
 {
 	TileInfo ti;
 
 	ti.tile = tile;
-	ti.z = z + GetCorrectTileHeight(tile);
-
+	ti.z = GetTileMaxZ(tile);
 	return VehicleFromPos(tile, &ti, EnsureNoVehicleProcZ) == NULL;
 }
 
-- 
cgit v1.2.3-70-g09d2