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