/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <draw.h>#include <memdraw.h>#include <memlayer.h> intmemload(Memimage *dst, Rectangle r, uchar *data, int n, int iscompressed){	int (*loadfn)(Memimage*, Rectangle, uchar*, int);	Memimage *tmp;	Memlayer *dl;	Rectangle lr;	int dx; 	loadfn = loadmemimage;	if(iscompressed)		loadfn = cloadmemimage;     Top:	dl = dst->layer;	if(dl == nil)		return loadfn(dst, r, data, n); 	/* 	 * Convert to screen coordinates.	 */	lr = r;	r.min.x += dl->delta.x;	r.min.y += dl->delta.y;	r.max.x += dl->delta.x;	r.max.y += dl->delta.y;	dx = dl->delta.x&(7/dst->depth);	if(dl->clear && dx==0){		dst = dl->screen->image;		goto Top;	} 	/*	 * dst is an obscured layer or data is unaligned	 */	if(dl->save && dx==0){		n = loadfn(dl->save, lr, data, n);		if(n > 0)			memlexpose(dst, r);		return n;	}	tmp = allocmemimage(lr, dst->chan);	if(tmp == nil)		return -1;	n = loadfn(tmp, lr, data, n);	memdraw(dst, lr, tmp, lr.min, nil, lr.min, S);	freememimage(tmp);	return n;}