1 #ifndef _MEMLAYER_H_
2 #define _MEMLAYER_H_ 1
3 #if defined(__cplusplus)
4 extern "C" { 
5 #endif
6 
7 AUTOLIB(memlayer)
8 
9 typedef struct Memscreen Memscreen;
10 typedef void (*Refreshfn)(Memimage*, Rectangle, void*);
11 
12 struct Memscreen
13 {
14 	Memimage	*frontmost;	/* frontmost layer on screen */
15 	Memimage	*rearmost;	/* rearmost layer on screen */
16 	Memimage	*image;		/* upon which all layers are drawn */
17 	Memimage	*fill;			/* if non-zero, picture to use when repainting */
18 };
19 
20 struct Memlayer
21 {
22 	Rectangle		screenr;	/* true position of layer on screen */
23 	Point			delta;	/* add delta to go from image coords to screen */
24 	Memscreen	*screen;	/* screen this layer belongs to */
25 	Memimage	*front;	/* window in front of this one */
26 	Memimage	*rear;	/* window behind this one*/
27 	int		clear;	/* layer is fully visible */
28 	Memimage	*save;	/* save area for obscured parts */
29 	Refreshfn	refreshfn;		/* function to call to refresh obscured parts if save==nil */
30 	void		*refreshptr;	/* argument to refreshfn */
31 };
32 
33 /*
34  * These functions accept local coordinates
35  */
36 int			memload(Memimage*, Rectangle, uchar*, int, int);
37 int			memunload(Memimage*, Rectangle, uchar*, int);
38 
39 /*
40  * All these functions accept screen coordinates, not local ones.
41  */
42 void			_memlayerop(void (*fn)(Memimage*, Rectangle, Rectangle, void*, int), Memimage*, Rectangle, Rectangle, void*);
43 Memimage*	memlalloc(Memscreen*, Rectangle, Refreshfn, void*, u32int);
44 void			memldelete(Memimage*);
45 void			memlfree(Memimage*);
46 void			memltofront(Memimage*);
47 void			memltofrontn(Memimage**, int);
48 void			_memltofrontfill(Memimage*, int);
49 void			memltorear(Memimage*);
50 void			memltorearn(Memimage**, int);
51 int			memlsetrefresh(Memimage*, Refreshfn, void*);
52 void			memlhide(Memimage*, Rectangle);
53 void			memlexpose(Memimage*, Rectangle);
54 void			_memlsetclear(Memscreen*);
55 int			memlorigin(Memimage*, Point, Point);
56 void			memlnorefresh(Memimage*, Rectangle, void*);
57 
58 
59 #if defined(__cplusplus)
60 }
61 #endif
62 #endif