(svn r3907) Replace many bridge related direct map accesses with calls to shiny new functions and mark some strange constructs with XXX

ai/default/default.c

@@ -2157,8 +2157,7 @@ static bool AiRemoveTileAndGoForward(Player *p)
 			return true;
 		}
 
-		if (!(_m[tile].m5 & 0x40)) {
-
+		if (IsBridgeRamp(tile)) {
 			// Check if the bridge points in the right direction.
 			// This is not really needed the first place AiRemoveTileAndGoForward is called.
 			if (DiagDirToAxis(GetBridgeRampDirection(tile)) != (p->ai.cur_dir_a & 1U)) return false;
@@ -3669,8 +3668,12 @@ pos_3:
 				CMD_REMOVE_ROAD);
 		}
 	} else if (IsTileType(tile, MP_TUNNELBRIDGE)) {
-		if (!IsTileOwner(tile, _current_player) || (_m[tile].m5 & 0xC6) != 0x80)
+		if (!IsTileOwner(tile, _current_player) ||
+				!IsBridge(tile) ||
+				!IsBridgeRamp(tile) ||
+				GetBridgeTransportType(tile) != TRANSPORT_RAIL) {
 			return;
+		}
 
 		m5 = 0;
 

ai/trolly/pathfinder.c

@@ -2,6 +2,7 @@
 
 #include "../../stdafx.h"
 #include "../../openttd.h"
+#include "../../bridge_map.h"
 #include "../../debug.h"
 #include "../../functions.h"
 #include "../../map.h"
@@ -44,8 +45,7 @@ static bool IsRoad(TileIndex tile)
 		(IsTileType(tile, MP_STREET) && !IsTileDepotType(tile, TRANSPORT_ROAD)) ||
 		(IsTileType(tile, MP_TUNNELBRIDGE) && (
 			(IsTunnel(tile) && GetTunnelTransportType(tile) == TRANSPORT_ROAD) ||
-			// road bridge?
-			((_m[tile].m5 & 0x80) != 0 && (_m[tile].m5 & 0x2) == 0x2)
+			(IsBridge(tile) && GetBridgeTransportType(tile) == TRANSPORT_ROAD)
 		));
 }
 
@@ -234,7 +234,7 @@ static void AyStar_AiPathFinder_GetNeighbours(AyStar *aystar, OpenListNode *curr
 					if (IsTunnel(atile)) {
 						if (GetTunnelDirection(atile) != i) continue;
 					} else {
-						if ((_m[atile].m5 & 1U) != DiagDirToAxis(i)) continue;
+						if (GetBridgeRampDirection(atile) != i) continue;
 					}
 				}
 			}