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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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int
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unloadimage(Image *i, Rectangle r, uchar *data, int ndata)
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{
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	int bpl, n, ntot, dy;
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	uchar *a;
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	Display *d;
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	if(!rectinrect(r, i->r)){
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		werrstr("unloadimage: bad rectangle");
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		return -1;
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	}
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	bpl = bytesperline(r, i->depth);
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	if(ndata < bpl*Dy(r)){
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		werrstr("unloadimage: buffer too small");
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		return -1;
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	}
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	d = i->display;
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	flushimage(d, 0);	/* make sure subsequent flush is for us only */
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	ntot = 0;
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	while(r.min.y < r.max.y){
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		a = bufimage(d, 1+4+4*4);
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		if(a == 0){
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			werrstr("unloadimage: %r");
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			return -1;
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		}
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		dy = 8000/bpl;
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		if(dy <= 0){
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			werrstr("unloadimage: image too wide");
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			return -1;
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		}
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		if(dy > Dy(r))
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			dy = Dy(r);
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		a[0] = 'r';
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		BPLONG(a+1, i->id);
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		BPLONG(a+5, r.min.x);
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		BPLONG(a+9, r.min.y);
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		BPLONG(a+13, r.max.x);
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		BPLONG(a+17, r.min.y+dy);
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		if(flushimage(d, 0) < 0)
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			return -1;
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		n = read(d->fd, data+ntot, ndata-ntot);
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		if(n < 0)
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			return n;
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		ntot += n;
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		r.min.y += dy;
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	}
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	return ntot;
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}