(svn r12754) -Codechange: split depot.h into depot_map.h, depot_func.h and depot_base.h and remove quite a lot of unneeded (before this) includes of depot.h.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/depot_func.h b/src/depot_func.h
new file mode 100644
index 000000000..5a2d28a6f
--- /dev/null
+++ b/src/depot_func.h
@@ -0,0 +1,39 @@
+/* $Id$ */
+
+/** @file depot_func.h Functions related to depots. */
+
+#ifndef DEPOT_FUNC_H
+#define DEPOT_FUNC_H
+
+#include "depot_type.h"
+#include "tile_type.h"
+#include "vehicle_type.h"
+#include "direction_type.h"
+#include "slope_type.h"
+
+void ShowDepotWindow(TileIndex tile, VehicleType type);
+void InitializeDepots();
+
+void DeleteDepotHighlightOfVehicle(const Vehicle *v);
+
+/**
+ * Find out if the slope of the tile is suitable to build a depot of given direction
+ * @param direction The direction in which the depot's exit points
+ * @param tileh The slope of the tile in question
+ * @return true if the construction is possible
+
+ * This is checked by the ugly 0x4C >> direction magic, which does the following:
+ * 0x4C is 0100 1100 and tileh has only bits 0..3 set (steep tiles are ruled out)
+ * So: for direction (only the significant bits are shown)<p>
+ * 00 (exit towards NE) we need either bit 2 or 3 set in tileh: 0x4C >> 0 = 1100<p>
+ * 01 (exit towards SE) we need either bit 1 or 2 set in tileh: 0x4C >> 1 = 0110<p>
+ * 02 (exit towards SW) we need either bit 0 or 1 set in tileh: 0x4C >> 2 = 0011<p>
+ * 03 (exit towards NW) we need either bit 0 or 4 set in tileh: 0x4C >> 3 = 1001<p>
+ * So ((0x4C >> direction) & tileh) determines whether the depot can be built on the current tileh
+ */
+static inline bool CanBuildDepotByTileh(DiagDirection direction, Slope tileh)
+{
+	return ((0x4C >> direction) & tileh) != 0;
+}
+
+#endif /* DEPOT_FUNC_H */