77 lines
1.6 KiB
C
77 lines
1.6 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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memldelete(Memimage *i)
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{
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Memscreen *s;
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Memlayer *l;
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l = i->layer;
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/* free backing store and disconnect refresh, to make pushback fast */
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freememimage(l->save);
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l->save = nil;
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l->refreshptr = nil;
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memltorear(i);
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/* window is now the rearmost; clean up screen structures and deallocate */
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s = i->layer->screen;
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if(s->fill){
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i->clipr = i->r;
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memdraw(i, i->r, s->fill, i->r.min, nil, i->r.min, S);
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}
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if(l->front){
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l->front->layer->rear = nil;
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s->rearmost = l->front;
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}else{
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s->frontmost = nil;
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s->rearmost = nil;
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}
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free(l);
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freememimage(i);
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}
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/*
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* Just free the data structures, don't do graphics
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*/
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void
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memlfree(Memimage *i)
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{
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Memlayer *l;
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l = i->layer;
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freememimage(l->save);
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free(l);
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freememimage(i);
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}
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void
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_memlsetclear(Memscreen *s)
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{
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Memimage *i, *j;
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Memlayer *l;
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for(i=s->rearmost; i; i=i->layer->front){
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l = i->layer;
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l->clear = rectinrect(l->screenr, l->screen->image->clipr);
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if(l->clear)
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for(j=l->front; j; j=j->layer->front)
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if(rectXrect(l->screenr, j->layer->screenr)){
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l->clear = 0;
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break;
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}
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}
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}
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