1 76193d7c 2003-09-30 devnull #include <u.h>
 2 76193d7c 2003-09-30 devnull #include <libc.h>
 3 76193d7c 2003-09-30 devnull #include <draw.h>
 4 76193d7c 2003-09-30 devnull #include <memdraw.h>
 5 76193d7c 2003-09-30 devnull #include <memlayer.h>
 6 76193d7c 2003-09-30 devnull 
 7 76193d7c 2003-09-30 devnull void
 8 76193d7c 2003-09-30 devnull _memltorear(Memimage *i, Memimage *rear)
 9 76193d7c 2003-09-30 devnull {
10 76193d7c 2003-09-30 devnull 	Memlayer *l;
11 76193d7c 2003-09-30 devnull 	Memscreen *s;
12 76193d7c 2003-09-30 devnull 	Memimage *f, *r, *rr;
13 76193d7c 2003-09-30 devnull 	Rectangle x;
14 76193d7c 2003-09-30 devnull 	int overlap;
15 76193d7c 2003-09-30 devnull 
16 76193d7c 2003-09-30 devnull 	l = i->layer;
17 76193d7c 2003-09-30 devnull 	s = l->screen;
18 76193d7c 2003-09-30 devnull 	while(l->rear != rear){
19 76193d7c 2003-09-30 devnull 		r = l->rear;
20 76193d7c 2003-09-30 devnull 		x = l->screenr;
21 76193d7c 2003-09-30 devnull 		overlap = rectclip(&x, r->layer->screenr);
22 76193d7c 2003-09-30 devnull 		if(overlap){
23 76193d7c 2003-09-30 devnull 			memlhide(i, x);
24 76193d7c 2003-09-30 devnull 			l->clear = 0;
25 76193d7c 2003-09-30 devnull 		}
26 76193d7c 2003-09-30 devnull 		/* swap l and r in screen's list */
27 76193d7c 2003-09-30 devnull 		rr = r->layer->rear;
28 76193d7c 2003-09-30 devnull 		f = l->front;
29 76193d7c 2003-09-30 devnull 		if(rr == nil)
30 76193d7c 2003-09-30 devnull 			s->rearmost = i;
31 76193d7c 2003-09-30 devnull 		else
32 76193d7c 2003-09-30 devnull 			rr->layer->front = i;
33 76193d7c 2003-09-30 devnull 		if(f == nil)
34 76193d7c 2003-09-30 devnull 			s->frontmost = r;
35 76193d7c 2003-09-30 devnull 		else
36 76193d7c 2003-09-30 devnull 			f->layer->rear = r;
37 76193d7c 2003-09-30 devnull 		l->rear = rr;
38 76193d7c 2003-09-30 devnull 		l->front = r;
39 76193d7c 2003-09-30 devnull 		r->layer->rear = i;
40 76193d7c 2003-09-30 devnull 		r->layer->front = f;
41 76193d7c 2003-09-30 devnull 		if(overlap)
42 76193d7c 2003-09-30 devnull 			memlexpose(r, x);
43 76193d7c 2003-09-30 devnull 	}
44 76193d7c 2003-09-30 devnull }
45 76193d7c 2003-09-30 devnull 
46 76193d7c 2003-09-30 devnull void
47 76193d7c 2003-09-30 devnull memltorear(Memimage *i)
48 76193d7c 2003-09-30 devnull {
49 76193d7c 2003-09-30 devnull 	_memltorear(i, nil);
50 76193d7c 2003-09-30 devnull 	_memlsetclear(i->layer->screen);
51 76193d7c 2003-09-30 devnull }
52 76193d7c 2003-09-30 devnull 
53 76193d7c 2003-09-30 devnull void
54 76193d7c 2003-09-30 devnull memltorearn(Memimage **ip, int n)
55 76193d7c 2003-09-30 devnull {
56 76193d7c 2003-09-30 devnull 	Memimage *i, *rear;
57 76193d7c 2003-09-30 devnull 	Memscreen *s;
58 76193d7c 2003-09-30 devnull 
59 76193d7c 2003-09-30 devnull 	if(n == 0)
60 76193d7c 2003-09-30 devnull 		return;
61 76193d7c 2003-09-30 devnull 	rear = nil;
62 76193d7c 2003-09-30 devnull 	while(--n >= 0){
63 76193d7c 2003-09-30 devnull 		i = *ip++;
64 76193d7c 2003-09-30 devnull 		_memltorear(i, rear);
65 76193d7c 2003-09-30 devnull 		rear = i;
66 76193d7c 2003-09-30 devnull 	}
67 76193d7c 2003-09-30 devnull 	s = rear->layer->screen;
68 76193d7c 2003-09-30 devnull 	_memlsetclear(s);
69 76193d7c 2003-09-30 devnull }