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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
void
memldelete(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
*/
void
memlfree(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;
}
}
}
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