79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <draw.h>
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#include <memdraw.h>
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#include <memlayer.h>
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void
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_memltorear(Memimage *i, Memimage *rear)
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{
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Memlayer *l;
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Memscreen *s;
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Memimage *f, *r, *rr;
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Rectangle x;
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int overlap;
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l = i->layer;
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s = l->screen;
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while(l->rear != rear){
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r = l->rear;
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x = l->screenr;
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overlap = rectclip(&x, r->layer->screenr);
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if(overlap){
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memlhide(i, x);
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l->clear = 0;
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}
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/* swap l and r in screen's list */
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rr = r->layer->rear;
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f = l->front;
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if(rr == nil)
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s->rearmost = i;
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else
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rr->layer->front = i;
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if(f == nil)
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s->frontmost = r;
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else
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f->layer->rear = r;
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l->rear = rr;
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l->front = r;
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r->layer->rear = i;
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r->layer->front = f;
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if(overlap)
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memlexpose(r, x);
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}
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}
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void
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memltorear(Memimage *i)
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{
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_memltorear(i, nil);
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_memlsetclear(i->layer->screen);
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}
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void
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memltorearn(Memimage **ip, int n)
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{
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Memimage *i, *rear;
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Memscreen *s;
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if(n == 0)
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return;
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rear = nil;
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while(--n >= 0){
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i = *ip++;
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_memltorear(i, rear);
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rear = i;
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}
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s = rear->layer->screen;
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_memlsetclear(s);
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}
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