#include <u.h>#include <libc.h>#include <draw.h> intloadimage(Image *i, Rectangle r, uchar *data, int ndata){	long dx, dy;	int n, bpl;	uchar *a;	int chunk; 	chunk = i->display->bufsize - 64; 	if(!rectinrect(r, i->r)){		werrstr("loadimage: bad rectangle");		return -1;	}	bpl = bytesperline(r, i->depth);	n = bpl*Dy(r);	if(n > ndata){		werrstr("loadimage: insufficient data");		return -1;	}	ndata = 0;	while(r.max.y > r.min.y){		dy = Dy(r);		dx = Dx(r);		if(dy*bpl > chunk)			dy = chunk/bpl;		if(dy <= 0){			dy = 1;			dx = (((vlong)chunk*dx)/bpl) & ~7;			n = bytesperline(Rect(r.min.x, r.min.y, r.min.x+dx, r.min.y+dy), i->depth);			if(loadimage(i, Rect(r.min.x+dx, r.min.y, r.max.x, r.min.y+dy), data+n, bpl-n) < 0)				return -1;		} else			n = dy*bpl;		_lockdisplay(i->display);		a = bufimage(i->display, 21+n);		if(a == nil){			_unlockdisplay(i->display);			werrstr("loadimage: %r");			return -1;		}		a[0] = 'y';		BPLONG(a+1, i->id);		BPLONG(a+5, r.min.x);		BPLONG(a+9, r.min.y);		BPLONG(a+13, r.min.x+dx);		BPLONG(a+17, r.min.y+dy);		memmove(a+21, data, n);		_unlockdisplay(i->display);		ndata += dy*bpl;		data += dy*bpl;		r.min.y += dy;	}	return ndata;}