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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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loadimage(Image *i, Rectangle r, uchar *data, int ndata)
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{
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	long dy;
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	int n, bpl;
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	uchar *a;
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	int chunk;
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	chunk = i->display->bufsize - 64;
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	if(!rectinrect(r, i->r)){
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		werrstr("loadimage: 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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	n = bpl*Dy(r);
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	if(n > ndata){
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		werrstr("loadimage: insufficient data");
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		return -1;
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	}
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	ndata = 0;
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	while(r.max.y > r.min.y){
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		dy = r.max.y - r.min.y;
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		if(dy*bpl > chunk)
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			dy = chunk/bpl;
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		if(dy <= 0){
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			werrstr("loadimage: image too wide for buffer");
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			return -1;
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		}
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		n = dy*bpl;
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		a = bufimage(i->display, 21+n);
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		if(a == nil){
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			werrstr("bufimage failed");
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			return -1;
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		}
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		a[0] = 'y';
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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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		memmove(a+21, data, n);
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		ndata += n;
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		data += n;
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		r.min.y += dy;
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	}
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	if(flushimage(i->display, 0) < 0)
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		return -1;
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	return ndata;
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}