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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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/*
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 * Pull i towards top of screen, just behind front
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*/
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static
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void
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_memltofront(Memimage *i, Memimage *front, int fill)
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{
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	Memlayer *l;
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	Memscreen *s;
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	Memimage *f, *ff, *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->front != front){
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		f = l->front;
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		x = l->screenr;
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		overlap = rectclip(&x, f->layer->screenr);
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		if(overlap){
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			memlhide(f, x);
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			f->layer->clear = 0;
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		}
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		/* swap l and f in screen's list */
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		ff = f->layer->front;
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		rr = l->rear;
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		if(ff == nil)
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			s->frontmost = i;
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		else
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			ff->layer->rear = i;
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		if(rr == nil)
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			s->rearmost = f;
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		else
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			rr->layer->front = f;
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		l->front = ff;
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		l->rear = f;
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		f->layer->front = i;
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		f->layer->rear = rr;
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		if(overlap && fill)
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			memlexpose(i, x);
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	}
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}
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void
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_memltofrontfill(Memimage *i, int fill)
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{
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	_memltofront(i, nil, fill);
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	_memlsetclear(i->layer->screen);
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}
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void
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memltofront(Memimage *i)
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{
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	_memltofront(i, nil, 1);
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	_memlsetclear(i->layer->screen);
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}
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void
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memltofrontn(Memimage **ip, int n)
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{
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	Memimage *i, *front;
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	Memscreen *s;
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	if(n == 0)
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		return;
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	front = nil;
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	while(--n >= 0){
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		i = *ip++;
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		_memltofront(i, front, 1);
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		front = i;
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	}
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	s = front->layer->screen;
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	_memlsetclear(s);
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}