(svn r6651) -Coding feature: added the windowevent WE_INVALIDATE_DATA
This gives the ability to invalidate some window data and recalculate as needed instead of doing it for each WE_PAINT

This event is called right away when using InvalidateWindowData(), so it may be a good idea to set a bool or similar in the window
or similar and then act on that bool in WE_PAINT instead of doing a lot of stuff in WE_INVALIDATE_DATA as it might be called more than once before WE_PAINT is called

InvalidateWindowData() will not automatically repaint the window, so if you want to repaint it as well, you need to mark it dirty as well.

Made the depot windows use WE_INVALIDATE_DATA to set when to generate the engine and wagon lists instead of at each redraw
It makes no sense to regenerate the list when say using the scrollbar if we know that no vehicle have entered or left the list

NOTE: currently there is a piece of code to generate the list when it's not needed and compare it to the stored list and assert if they mismatch
This check is somewhat slow and kills the whole idea of WE_INVALIDATE_DATA, so it's a short lived one to verify that InvalidateWindowData() is used everywhere where it's needed

/* $Id$ */

#ifndef SPRITE_H
#define SPRITE_H


/* The following describes bunch of sprites to be drawn together in a single 3D
 * bounding box. Used especially for various multi-sprite buildings (like
 * depots or stations): */

typedef struct DrawTileSeqStruct {
	int8 delta_x; // 0x80 is sequence terminator
	int8 delta_y;
	int8 delta_z;
	byte size_x;
	byte size_y;
	byte size_z;
	uint32 image;
} DrawTileSeqStruct;

typedef struct DrawTileSprites {
	SpriteID ground_sprite;
	const DrawTileSeqStruct* seq;
} DrawTileSprites;

/**
 * This structure is the same for both Industries and Houses.
 * Buildings here reference a general type of construction
 */
typedef struct DrawBuildingsTileStruct {
	SpriteID ground;
	SpriteID building;
	byte subtile_x:4;
	byte subtile_y:4;
	byte width:4;
	byte height:4;
	byte dz;
	byte draw_proc;  /* this allows to specify a special drawing procedure.*/
} DrawBuildingsTileStruct;

// Iterate through all DrawTileSeqStructs in DrawTileSprites.
#define foreach_draw_tile_seq(idx, list) for (idx = list; ((byte) idx->delta_x) != 0x80; idx++)


#endif /* SPRITE_H */