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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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int
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unloadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata)
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{
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	int y, l;
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	uchar *q;
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	if(!rectinrect(r, i->r))
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		return -1;
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	l = bytesperline(r, i->depth);
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	if(ndata < l*Dy(r))
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		return -1;
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	ndata = l*Dy(r);
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	q = byteaddr(i, r.min);
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	for(y=r.min.y; y<r.max.y; y++){
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		memmove(data, q, l);
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		q += i->width*sizeof(ulong);
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		data += l;
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	}
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	return ndata;
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}