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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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int
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memunload(Memimage *src, Rectangle r, uchar *data, int n)
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{
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	Memimage *tmp;
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	Memlayer *dl;
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	Rectangle lr;
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	int dx;
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    Top:
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	dl = src->layer;
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	if(dl == nil)
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		return unloadmemimage(src, r, data, n);
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	/*
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 	 * Convert to screen coordinates.
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	 */
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	lr = r;
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	r.min.x += dl->delta.x;
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	r.min.y += dl->delta.y;
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	r.max.x += dl->delta.x;
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	r.max.y += dl->delta.y;
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	dx = dl->delta.x&(7/src->depth);
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	if(dl->clear && dx==0){
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		src = dl->screen->image;
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		goto Top;
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	}
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	/*
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	 * src is an obscured layer or data is unaligned
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	 */
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	if(dl->save && dx==0){
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		if(dl->refreshfn != nil)
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			return -1;	/* can't unload window if it's not Refbackup */
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		if(n > 0)
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			memlhide(src, r);
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		n = unloadmemimage(dl->save, lr, data, n);
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		return n;
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	}
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	tmp = allocmemimage(lr, src->chan);
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	if(tmp == nil)
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		return -1;
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	memdraw(tmp, lr, src, lr.min, nil, lr.min, S);
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	n = unloadmemimage(tmp, lr, data, n);
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	freememimage(tmp);
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	return n;
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}