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#include <u.h>
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#include <libc.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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}