| rsc | 76193d7 | 2003-09-30 17:47:42 +0000 | [diff] [blame] | 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <draw.h> |
| 4 | #include <memdraw.h> |
| 5 | #include <memlayer.h> |
| 6 | |
| 7 | void |
| 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 |
| 47 | memltorear(Memimage *i) |
| 48 | { |
| 49 | _memltorear(i, nil); |
| 50 | _memlsetclear(i->layer->screen); |
| 51 | } |
| 52 | |
| 53 | void |
| 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 | } |
