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

bridge_map.c

@@ -0,0 +1,17 @@
+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "bridge_map.h"
+
+
+TileIndex GetOtherBridgeEnd(TileIndex tile)
+{
+	TileIndexDiff delta = TileOffsByDir(GetBridgeRampDirection(tile));
+
+	do {
+		tile += delta;
+	} while (!IsBridgeRamp(tile));
+
+	return tile;
+}