1*8ccd4a63SDavid du Colombier #include <u.h>
2*8ccd4a63SDavid du Colombier #include <libc.h>
3*8ccd4a63SDavid du Colombier #include <draw.h>
4*8ccd4a63SDavid du Colombier #include <memdraw.h>
5*8ccd4a63SDavid du Colombier #include <memlayer.h>
67dd7cddfSDavid du Colombier
77dd7cddfSDavid du Colombier void
_memltorear(Memimage * i,Memimage * rear)87dd7cddfSDavid du Colombier _memltorear(Memimage *i, Memimage *rear)
97dd7cddfSDavid du Colombier {
107dd7cddfSDavid du Colombier Memlayer *l;
117dd7cddfSDavid du Colombier Memscreen *s;
127dd7cddfSDavid du Colombier Memimage *f, *r, *rr;
137dd7cddfSDavid du Colombier Rectangle x;
147dd7cddfSDavid du Colombier int overlap;
157dd7cddfSDavid du Colombier
167dd7cddfSDavid du Colombier l = i->layer;
177dd7cddfSDavid du Colombier s = l->screen;
187dd7cddfSDavid du Colombier while(l->rear != rear){
197dd7cddfSDavid du Colombier r = l->rear;
207dd7cddfSDavid du Colombier x = l->screenr;
217dd7cddfSDavid du Colombier overlap = rectclip(&x, r->layer->screenr);
227dd7cddfSDavid du Colombier if(overlap){
237dd7cddfSDavid du Colombier memlhide(i, x);
247dd7cddfSDavid du Colombier l->clear = 0;
257dd7cddfSDavid du Colombier }
267dd7cddfSDavid du Colombier /* swap l and r in screen's list */
277dd7cddfSDavid du Colombier rr = r->layer->rear;
287dd7cddfSDavid du Colombier f = l->front;
297dd7cddfSDavid du Colombier if(rr == nil)
307dd7cddfSDavid du Colombier s->rearmost = i;
317dd7cddfSDavid du Colombier else
327dd7cddfSDavid du Colombier rr->layer->front = i;
337dd7cddfSDavid du Colombier if(f == nil)
347dd7cddfSDavid du Colombier s->frontmost = r;
357dd7cddfSDavid du Colombier else
367dd7cddfSDavid du Colombier f->layer->rear = r;
377dd7cddfSDavid du Colombier l->rear = rr;
387dd7cddfSDavid du Colombier l->front = r;
397dd7cddfSDavid du Colombier r->layer->rear = i;
407dd7cddfSDavid du Colombier r->layer->front = f;
417dd7cddfSDavid du Colombier if(overlap)
427dd7cddfSDavid du Colombier memlexpose(r, x);
437dd7cddfSDavid du Colombier }
447dd7cddfSDavid du Colombier }
457dd7cddfSDavid du Colombier
467dd7cddfSDavid du Colombier void
memltorear(Memimage * i)477dd7cddfSDavid du Colombier memltorear(Memimage *i)
487dd7cddfSDavid du Colombier {
497dd7cddfSDavid du Colombier _memltorear(i, nil);
50*8ccd4a63SDavid du Colombier _memlsetclear(i->layer->screen);
517dd7cddfSDavid du Colombier }
527dd7cddfSDavid du Colombier
537dd7cddfSDavid du Colombier void
memltorearn(Memimage ** ip,int n)547dd7cddfSDavid du Colombier memltorearn(Memimage **ip, int n)
557dd7cddfSDavid du Colombier {
567dd7cddfSDavid du Colombier Memimage *i, *rear;
577dd7cddfSDavid du Colombier Memscreen *s;
587dd7cddfSDavid du Colombier
597dd7cddfSDavid du Colombier if(n == 0)
607dd7cddfSDavid du Colombier return;
617dd7cddfSDavid du Colombier rear = nil;
627dd7cddfSDavid du Colombier while(--n >= 0){
637dd7cddfSDavid du Colombier i = *ip++;
647dd7cddfSDavid du Colombier _memltorear(i, rear);
657dd7cddfSDavid du Colombier rear = i;
667dd7cddfSDavid du Colombier }
677dd7cddfSDavid du Colombier s = rear->layer->screen;
68*8ccd4a63SDavid du Colombier _memlsetclear(s);
697dd7cddfSDavid du Colombier }
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