#include "lib9.h"#include "draw.h"#include "memdraw.h" intunloadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata){	int y, l;	uchar *q; 	if(!rectinrect(r, i->r))		return -1;	l = bytesperline(r, i->depth);	if(ndata < l*Dy(r))		return -1;	ndata = l*Dy(r);	q = byteaddr(i, r.min);	for(y=r.min.y; y<r.max.y; y++){		memmove(data, q, l);		q += i->width*sizeof(ulong);		data += l;	}	return ndata;}