Subversion Repositories planix.SVN

#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);
}