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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <draw.h>
- #include <memdraw.h>
- #include <memlayer.h>
- void
- _memltorear(Memimage *i, Memimage *rear)
- {
- Memlayer *l;
- Memscreen *s;
- Memimage *f, *r, *rr;
- Rectangle x;
- int overlap;
- l = i->layer;
- s = l->screen;
- while(l->rear != rear){
- r = l->rear;
- x = l->screenr;
- overlap = rectclip(&x, r->layer->screenr);
- if(overlap){
- memlhide(i, x);
- l->clear = 0;
- }
- /* swap l and r in screen's list */
- rr = r->layer->rear;
- f = l->front;
- if(rr == nil)
- s->rearmost = i;
- else
- rr->layer->front = i;
- if(f == nil)
- s->frontmost = r;
- else
- f->layer->rear = r;
- l->rear = rr;
- l->front = r;
- r->layer->rear = i;
- r->layer->front = f;
- if(overlap)
- memlexpose(r, x);
- }
- }
- void
- memltorear(Memimage *i)
- {
- _memltorear(i, nil);
- _memlsetclear(i->layer->screen);
- }
- void
- memltorearn(Memimage **ip, int n)
- {
- Memimage *i, *rear;
- Memscreen *s;
- if(n == 0)
- return;
- rear = nil;
- while(--n >= 0){
- i = *ip++;
- _memltorear(i, rear);
- rear = i;
- }
- s = rear->layer->screen;
- _memlsetclear(s);
- }
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