#include "lib9.h"#include "draw.h"#include "memdraw.h"#include "memlayer.h" voidmemldelete(Memimage *i){	Memscreen *s;	Memlayer *l; 	l = i->layer;	/* free backing store and disconnect refresh, to make pushback fast */	freememimage(l->save);	l->save = nil;	l->refreshptr = nil;	memltorear(i); 	/* window is now the rearmost;  clean up screen structures and deallocate */	s = i->layer->screen;	if(s->fill){		i->clipr = i->r;		memdraw(i, i->r, s->fill, i->r.min, nil, i->r.min, S);	}	if(l->front){		l->front->layer->rear = nil;		s->rearmost = l->front;	}else{		s->frontmost = nil;		s->rearmost = nil;	}	free(l);	freememimage(i);} /* * Just free the data structures, don't do graphics */voidmemlfree(Memimage *i){	Memlayer *l; 	l = i->layer;	freememimage(l->save);	free(l);	freememimage(i);} void_memlsetclear(Memscreen *s){	Memimage *i, *j;	Memlayer *l; 	for(i=s->rearmost; i; i=i->layer->front){		l = i->layer;		l->clear = rectinrect(l->screenr, l->screen->image->clipr);		if(l->clear)			for(j=l->front; j; j=j->layer->front)				if(rectXrect(l->screenr, j->layer->screenr)){					l->clear = 0;					break;				}	}}