(svn r3887) Add a function to get the other bridge end when you're at a bridge ramp

bridge_map.h

@@ -10,6 +10,12 @@
 #include "tile.h"
 
 
+static inline bool IsBridgeRamp(TileIndex t)
+{
+	return !HASBIT(_m[t].m5, 6);
+}
+
+
 /**
  * Get the direction pointing onto the bridge
  */
@@ -22,6 +28,12 @@ static inline DiagDirection GetBridgeRampDirection(TileIndex t)
 }
 
 
+/**
+ * Starting at one bridge end finds the other bridge end
+ */
+TileIndex GetOtherBridgeEnd(TileIndex);
+
+
 static inline void SetClearUnderBridge(TileIndex t)
 {
 	SetTileOwner(t, OWNER_NONE);