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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
void
_memltorear(Memimage *i, Memimage *rear)
{
Memlayer *l;
Memscreen *s;
Memimage *f, *r, *rr;
Rectangle x;
int overlap;
l = i->layer;
s = l->screen;
while(l->rear != rear){
r = l->rear;
x = l->screenr;
overlap = rectclip(&x, r->layer->screenr);
if(overlap){
memlhide(i, x);
l->clear = 0;
}
/* swap l and r in screen's list */
rr = r->layer->rear;
f = l->front;
if(rr == nil)
s->rearmost = i;
else
rr->layer->front = i;
if(f == nil)
s->frontmost = r;
else
f->layer->rear = r;
l->rear = rr;
l->front = r;
r->layer->rear = i;
r->layer->front = f;
if(overlap)
memlexpose(r, x);
}
}
void
memltorear(Memimage *i)
{
_memltorear(i, nil);
_memlsetclear(i->layer->screen);
}
void
memltorearn(Memimage **ip, int n)
{
Memimage *i, *rear;
Memscreen *s;
if(n == 0)
return;
rear = nil;
while(--n >= 0){
i = *ip++;
_memltorear(i, rear);
rear = i;
}
s = rear->layer->screen;
_memlsetclear(s);
}
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