(svn r23110) -Codechange: let the flying altitude return ints are well

src/aircraft.h

@@ -34,7 +34,7 @@ void UpdateAircraftCache(Aircraft *v);
 void AircraftLeaveHangar(Aircraft *v, Direction exit_dir);
 void AircraftNextAirportPos_and_Order(Aircraft *v);
 void SetAircraftPosition(Aircraft *v, int x, int y, int z);
-byte GetAircraftFlyingAltitude(const Aircraft *v);
+int GetAircraftFlyingAltitude(const Aircraft *v);
 
 /**
  * Aircraft, helicopters, rotors and their shadows belong to this class.

src/aircraft_cmd.cpp

@@ -630,14 +630,14 @@ static int UpdateAircraftSpeed(Aircraft *v, uint speed_limit = SPEED_LIMIT_NONE,
  * @param v The vehicle. Should be an aircraft
  * @returns Altitude in pixel units
  */
-byte GetAircraftFlyingAltitude(const Aircraft *v)
+int GetAircraftFlyingAltitude(const Aircraft *v)
 {
 	if (v->subtype == AIR_HELICOPTER) return HELI_FLIGHT_ALTITUDE;
 
 	/* Make sure Aircraft fly no lower so that they don't conduct
 	 * CFITs (controlled flight into terrain)
 	 */
-	byte base_altitude = PLANE_HOLDING_ALTITUDE;
+	int base_altitude = PLANE_HOLDING_ALTITUDE;
 
 	/* Make sure eastbound and westbound planes do not "crash" into each
 	 * other by providing them with vertical seperation
@@ -776,7 +776,7 @@ static bool AircraftController(Aircraft *v)
 			count = UpdateAircraftSpeed(v);
 			if (count > 0) {
 				v->tile = 0;
-				byte z_dest = GetAircraftFlyingAltitude(v);
+				int z_dest = GetAircraftFlyingAltitude(v);
 
 				/* Reached altitude? */
 				if (v->z_pos >= z_dest) {

src/elrail.cpp

@@ -315,7 +315,7 @@ static void DrawCatenaryRailway(const TileInfo *ti)
 		};
 		SpriteID pylon_base = (halftile_corner != CORNER_INVALID && HasBit(edge_corners[i], halftile_corner)) ? pylon_halftile : pylon_normal;
 		TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);
-		byte elevation = GetPCPElevation(ti->tile, i);
+		int elevation = GetPCPElevation(ti->tile, i);
 
 		/* Here's one of the main headaches. GetTileSlope does not correct for possibly
 		 * existing foundataions, so we do have to do that manually later on.*/

src/tunnelbridge_cmd.cpp

@@ -794,7 +794,7 @@ static CommandCost DoClearBridge(TileIndex tile, DoCommandFlag flags)
 		/* read this value before actual removal of bridge */
 		bool rail = GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL;
 		Owner owner = GetTileOwner(tile);
-		uint height = GetBridgeHeight(tile);
+		int height = GetBridgeHeight(tile);
 		Train *v = NULL;
 
 		if (rail && HasTunnelBridgeReservation(tile)) {
@@ -807,7 +807,7 @@ static CommandCost DoClearBridge(TileIndex tile, DoCommandFlag flags)
 		for (TileIndex c = tile + delta; c != endtile; c += delta) {
 			/* do not let trees appear from 'nowhere' after removing bridge */
 			if (IsNormalRoadTile(c) && GetRoadside(c) == ROADSIDE_TREES) {
-				uint minz = GetTileMaxZ(c) + 3;
+				int minz = GetTileMaxZ(c) + 3;
 				if (height < minz) SetRoadside(c, ROADSIDE_PAVED);
 			}
 			ClearBridgeMiddle(c);
@@ -950,7 +950,7 @@ static void DrawBridgePillars(const PalSpriteID *psid, const TileInfo *ti, Axis
  * @param overlay do we want to still see the road?
  * @param head    are we drawing bridge head?
  */
-static void DrawBridgeTramBits(int x, int y, byte z, int offset, bool overlay, bool head)
+static void DrawBridgeTramBits(int x, int y, int z, int offset, bool overlay, bool head)
 {
 	static const SpriteID tram_offsets[2][6] = { { 107, 108, 109, 110, 111, 112 }, { 4, 5, 15, 16, 17, 18 } };
 	static const SpriteID back_offsets[6]    =   {  95,  96,  99, 102, 100, 101 };

src/vehicle.cpp

@@ -408,7 +408,7 @@ bool HasVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc)
 }
 
 /**
- * Callback that returns 'real' vehicles lower or at height \c *(byte*)data .
+ * Callback that returns 'real' vehicles lower or at height \c *(int*)data .
  * @param v Vehicle to examine.
  * @param data Pointer to height data.
  * @return \a v if conditions are met, else \c NULL.

src/viewport.cpp

@@ -599,7 +599,7 @@ void OffsetGroundSprite(int x, int y)
  * @param z position z of the sprite.
  * @param sub Only draw a part of the sprite.
  */
-static void AddCombinedSprite(SpriteID image, PaletteID pal, int x, int y, byte z, const SubSprite *sub)
+static void AddCombinedSprite(SpriteID image, PaletteID pal, int x, int y, int z, const SubSprite *sub)
 {
 	Point pt = RemapCoords(x, y, z);
 	const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
@@ -984,7 +984,7 @@ draw_inner:
 			if (!is_redsq) DrawTileSelectionRect(ti, _thd.make_square_red ? PALETTE_SEL_TILE_RED : PAL_NONE);
 		} else if (_thd.drawstyle & HT_POINT) {
 			/* Figure out the Z coordinate for the single dot. */
-			byte z = 0;
+			int z = 0;
 			FoundationPart foundation_part = FOUNDATION_PART_NORMAL;
 			if (ti->tileh & SLOPE_N) {
 				z += TILE_HEIGHT;