1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <memdraw.h>
5 #include <memlayer.h>
6
7 void
_memltorear(Memimage * i,Memimage * rear)8 _memltorear(Memimage *i, Memimage *rear)
9 {
10 Memlayer *l;
11 Memscreen *s;
12 Memimage *f, *r, *rr;
13 Rectangle x;
14 int overlap;
15
16 l = i->layer;
17 s = l->screen;
18 while(l->rear != rear){
19 r = l->rear;
20 x = l->screenr;
21 overlap = rectclip(&x, r->layer->screenr);
22 if(overlap){
23 memlhide(i, x);
24 l->clear = 0;
25 }
26 /* swap l and r in screen's list */
27 rr = r->layer->rear;
28 f = l->front;
29 if(rr == nil)
30 s->rearmost = i;
31 else
32 rr->layer->front = i;
33 if(f == nil)
34 s->frontmost = r;
35 else
36 f->layer->rear = r;
37 l->rear = rr;
38 l->front = r;
39 r->layer->rear = i;
40 r->layer->front = f;
41 if(overlap)
42 memlexpose(r, x);
43 }
44 }
45
46 void
memltorear(Memimage * i)47 memltorear(Memimage *i)
48 {
49 _memltorear(i, nil);
50 _memlsetclear(i->layer->screen);
51 }
52
53 void
memltorearn(Memimage ** ip,int n)54 memltorearn(Memimage **ip, int n)
55 {
56 Memimage *i, *rear;
57 Memscreen *s;
58
59 if(n == 0)
60 return;
61 rear = nil;
62 while(--n >= 0){
63 i = *ip++;
64 _memltorear(i, rear);
65 rear = i;
66 }
67 s = rear->layer->screen;
68 _memlsetclear(s);
69 }
70