(svn r26876) -Codechange: move 'has bride above' data from m6 to type

src/bridge_map.h

@@ -52,13 +52,11 @@ static inline bool MayHaveBridgeAbove(TileIndex t)
 /**
  * checks if a bridge is set above the ground of this tile
  * @param t The tile to analyze
- * @pre MayHaveBridgeAbove(t)
  * @return true if a bridge is detected above
  */
 static inline bool IsBridgeAbove(TileIndex t)
 {
-	assert(MayHaveBridgeAbove(t));
-	return GB(_m[t].m6, 6, 2) != 0;
+	return GB(_m[t].type, 2, 2) != 0;
 }
 
 /**
@@ -82,7 +80,7 @@ static inline BridgeType GetBridgeType(TileIndex t)
 static inline Axis GetBridgeAxis(TileIndex t)
 {
 	assert(IsBridgeAbove(t));
-	return (Axis)(GB(_m[t].m6, 6, 2) - 1);
+	return (Axis)(GB(_m[t].type, 2, 2) - 1);
 }
 
 TileIndex GetNorthernBridgeEnd(TileIndex t);
@@ -104,18 +102,15 @@ static inline int GetBridgePixelHeight(TileIndex tile)
  * Remove the bridge over the given axis.
  * @param t the tile to remove the bridge from
  * @param a the axis of the bridge to remove
- * @pre MayHaveBridgeAbove(t)
  */
 static inline void ClearSingleBridgeMiddle(TileIndex t, Axis a)
 {
-	assert(MayHaveBridgeAbove(t));
-	ClrBit(_m[t].m6, 6 + a);
+	ClrBit(_m[t].type, 2 + a);
 }
 
 /**
  * Removes bridges from the given, that is bridges along the X and Y axis.
  * @param t the tile to remove the bridge from
- * @pre MayHaveBridgeAbove(t)
  */
 static inline void ClearBridgeMiddle(TileIndex t)
 {
@@ -127,12 +122,10 @@ static inline void ClearBridgeMiddle(TileIndex t)
  * Set that there is a bridge over the given axis.
  * @param t the tile to add the bridge to
  * @param a the axis of the bridge to add
- * @pre MayHaveBridgeAbove(t)
  */
 static inline void SetBridgeMiddle(TileIndex t, Axis a)
 {
-	assert(MayHaveBridgeAbove(t));
-	SetBit(_m[t].m6, 6 + a);
+	SetBit(_m[t].type, 2 + a);
 }
 
 /**

src/clear_map.h

@@ -260,10 +260,6 @@ static inline void SetFence(TileIndex t, DiagDirection side, uint h)
  */
 static inline void MakeClear(TileIndex t, ClearGround g, uint density)
 {
-	/* If this is a non-bridgeable tile, clear the bridge bits while the rest
-	 * of the tile information is still here. */
-	if (!MayHaveBridgeAbove(t)) SB(_m[t].m6, 6, 2, 0);
-
 	SetTileType(t, MP_CLEAR);
 	_m[t].m1 = 0;
 	SetTileOwner(t, OWNER_NONE);
@@ -271,7 +267,7 @@ static inline void MakeClear(TileIndex t, ClearGround g, uint density)
 	_m[t].m3 = 0;
 	_m[t].m4 = 0 << 5 | 0 << 2;
 	SetClearGroundDensity(t, g, density); // Sets m5
-	SB(_m[t].m6, 2, 4, 0); // Other bits are "tropic zone" and "bridge above"
+	_m[t].m6 = 0;
 	_me[t].m7 = 0;
 }
 

src/map_type.h

@@ -17,14 +17,14 @@
  * Look at docs/landscape.html for the exact meaning of the members.
  */
 struct Tile {
-	byte   type;        ///< The type (bits 4..7)
+	byte   type;        ///< The type (bits 4..7), bridges (2..3), rainforest/desert (0..1)
 	byte   height;      ///< The height of the northern corner.
 	byte   m1;          ///< Primarily used for ownership information
 	uint16 m2;          ///< Primarily used for indices to towns, industries and stations
 	byte   m3;          ///< General purpose
 	byte   m4;          ///< General purpose
 	byte   m5;          ///< General purpose
-	byte   m6;          ///< Primarily used for bridges and rainforest/desert
+	byte   m6;          ///< General purpose
 };
 
 /**

src/saveload/afterload.cpp

@@ -576,6 +576,12 @@ bool AfterLoadGame()
 			_m[t].height = GB(_m[t].type, 0, 4);
 			SB(_m[t].type, 0, 2, GB(_m[t].m6, 0, 2));
 			SB(_m[t].m6, 0, 2, 0);
+			if (MayHaveBridgeAbove(t)) {
+				SB(_m[t].type, 2, 2, GB(_m[t].m6, 6, 2));
+				SB(_m[t].m6, 6, 2, 0);
+			} else {
+				SB(_m[t].type, 2, 2, 0);
+			}
 		}
 	}