(svn r3167) - NewGRF: Start moving custom station code to separate files.

Rewrite handling of station classes.
          Allow for more than 8 station tile layouts.
          Start of code to unload custom stations.

station_newgrf.h

@@ -0,0 +1,77 @@
+/* $Id$ */
+
+/** @file station_newgrf.h Header file for NewGRF stations */
+
+#ifndef STATION_NEWGRF_H
+#define STATION_NEWGRF_H
+
+#include "engine.h"
+
+typedef enum {
+	STAT_CLASS_DFLT,     ///< Default station class.
+	STAT_CLASS_WAYP,     ///< Waypoint class.
+	STAT_CLASS_MAX = 16, ///< Maximum number of classes.
+} StationClassID;
+
+/* Station layout for given dimensions - it is a two-dimensional array
+ * where index is computed as (x * platforms) + platform. */
+typedef byte *StationLayout;
+
+typedef struct stationspec {
+	uint32 grfid; ///< ID of GRF file station belongs to.
+	int localidx; ///< Index within GRF file of station.
+
+	StationClassID sclass; ///< The class to which this spec belongs.
+
+	/**
+	 * Bitmask of number of platforms available for the station.
+	 * 0..6 correpsond to 1..7, while bit 7 corresponds to >7 platforms.
+	 */
+	byte allowed_platforms;
+	/**
+	 * Bitmask of platform lengths available for the station.
+	 * 0..6 correpsond to 1..7, while bit 7 corresponds to >7 tiles long.
+	 */
+	byte allowed_lengths;
+
+	/** Number of tile layouts.
+	 * A minimum of 8 is required is required for stations.
+	 * 0-1 = plain platform
+	 * 2-3 = platform with building
+	 * 4-5 = platform with roof, left side
+	 * 6-7 = platform with roof, right side
+	 */
+	int tiles;
+	DrawTileSprites *renderdata; ///< Array of tile layouts.
+
+	byte lengths;
+	byte *platforms;
+	StationLayout **layouts;
+
+	/**
+	 * NUM_GLOBAL_CID sprite groups.
+	 * Used for obtaining the sprite offset of custom sprites, and for
+	 * evaluating callbacks.
+	 */
+	SpriteGroup *spritegroup[NUM_GLOBAL_CID];
+} StationSpec;
+
+/**
+ * Struct containing information relating to station classes.
+ */
+typedef struct stationclass {
+	uint32 id;          ///< ID of this class, e.g. 'DFLT', 'WAYP', etc.
+	char *name;         ///< Name of this class.
+	uint stations;      ///< Number of stations in this class.
+	StationSpec **spec; ///< Array of station specifications.
+} StationClass;
+
+void ResetStationClasses(void);
+StationClassID AllocateStationClass(uint32 class);
+void SetStationClassName(StationClassID sclass, const char *name);
+uint GetNumCustomStations(StationClassID sclass);
+
+void SetCustomStation(StationSpec *spec);
+const StationSpec *GetCustomStation(StationClassID sclass, uint station);
+
+#endif /* STATION_NEWGRF_H */