1 files changed, 163 insertions, 0 deletions
diff --git a/src/bridge_map.h b/src/bridge_map.h
new file mode 100644
index 000000000..1cda0da9d
--- /dev/null
+++ b/src/bridge_map.h
@@ -0,0 +1,163 @@
+/* $Id$ */
+
+#ifndef BRIDGE_MAP_H
+#define BRIDGE_MAP_H
+
+#include "direction.h"
+#include "macros.h"
+#include "map.h"
+#include "rail.h"
+#include "road_map.h"
+#include "tile.h"
+
+
+void DrawBridgeMiddle(const TileInfo* ti); // XXX
+
+
+static inline bool IsBridge(TileIndex t)
+{
+	assert(IsTileType(t, MP_TUNNELBRIDGE));
+	return HASBIT(_m[t].m5, 7);
+}
+
+static inline bool IsBridgeTile(TileIndex t)
+{
+	return IsTileType(t, MP_TUNNELBRIDGE) && IsBridge(t);
+}
+
+
+static inline bool MayHaveBridgeAbove(TileIndex t)
+{
+	return
+		IsTileType(t, MP_CLEAR) ||
+		IsTileType(t, MP_RAILWAY) ||
+		IsTileType(t, MP_STREET) ||
+		IsTileType(t, MP_WATER) ||
+		IsTileType(t, MP_TUNNELBRIDGE) ||
+		IsTileType(t, MP_UNMOVABLE);
+}
+
+
+static inline bool IsBridgeAbove(TileIndex t)
+{
+	assert(MayHaveBridgeAbove(t));
+	return GB(_m[t].extra, 6, 2) != 0;
+}
+
+
+/**
+ * Determines the type of bridge on a tile
+ * @param tile The tile to analyze
+ * @return The bridge type
+ */
+static inline uint GetBridgeType(TileIndex t)
+{
+	assert(IsBridgeTile(t));
+	return GB(_m[t].m2, 4, 4);
+}
+
+
+/**
+ * Get the direction pointing onto the bridge
+ */
+static inline DiagDirection GetBridgeRampDirection(TileIndex t)
+{
+	assert(IsBridgeTile(t));
+	return (DiagDirection)GB(_m[t].m5, 0, 2);
+}
+
+
+static inline Axis GetBridgeAxis(TileIndex t)
+{
+	assert(IsBridgeAbove(t));
+	return (Axis)(GB(_m[t].extra, 6, 2) - 1);
+}
+
+
+static inline TransportType GetBridgeTransportType(TileIndex t)
+{
+	assert(IsBridgeTile(t));
+	return (TransportType)GB(_m[t].m5, 2, 2);
+}
+
+
+static inline bool HasBridgeSnowOrDesert(TileIndex t)
+{
+	assert(IsBridgeTile(t));
+	return HASBIT(_m[t].m4, 7);
+}
+
+
+static inline void SetBridgeSnowOrDesert(TileIndex t, bool snow_or_desert)
+{
+	assert(IsBridgeTile(t));
+	SB(_m[t].m4, 7, 1, snow_or_desert);
+}
+
+/**
+ * Finds the end of a bridge in the specified direction starting at a middle tile
+ */
+TileIndex GetBridgeEnd(TileIndex, DiagDirection);
+
+/**
+ * Finds the northern end of a bridge starting at a middle tile
+ */
+TileIndex GetNorthernBridgeEnd(TileIndex t);
+
+/**
+ * Finds the southern end of a bridge starting at a middle tile
+ */
+TileIndex GetSouthernBridgeEnd(TileIndex t);
+
+
+/**
+ * Starting at one bridge end finds the other bridge end
+ */
+TileIndex GetOtherBridgeEnd(TileIndex);
+
+uint GetBridgeHeight(TileIndex tile);
+uint GetBridgeFoundation(Slope tileh, Axis axis);
+
+static inline void ClearSingleBridgeMiddle(TileIndex t, Axis a)
+{
+	assert(MayHaveBridgeAbove(t));
+	CLRBIT(_m[t].extra, 6 + a);
+}
+
+
+static inline void ClearBridgeMiddle(TileIndex t)
+{
+	ClearSingleBridgeMiddle(t, AXIS_X);
+	ClearSingleBridgeMiddle(t, AXIS_Y);
+}
+
+static inline void SetBridgeMiddle(TileIndex t, Axis a)
+{
+	assert(MayHaveBridgeAbove(t));
+	SETBIT(_m[t].extra, 6 + a);
+}
+
+
+static inline void MakeBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, TransportType tt)
+{
+	SetTileType(t, MP_TUNNELBRIDGE);
+	SetTileOwner(t, o);
+	_m[t].m2 = bridgetype << 4;
+	_m[t].m4 = 0;
+	_m[t].m5 = 1 << 7 | tt << 2 | d;
+}
+
+static inline void MakeRoadBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d)
+{
+	MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_ROAD);
+	_m[t].m3 = 0;
+}
+
+static inline void MakeRailBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, RailType r)
+{
+	MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_RAIL);
+	_m[t].m3 = r;
+}
+
+
+#endif /* BRIDGE_MAP_H */