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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/libmemlayer/ltorear.c – Rev 2

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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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_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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}