sys/src/libmemlayer/ltofront.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include <memdraw.h>
   5 #include <memlayer.h>
   6
   7 /*
   8  * Pull i towards top of screen, just behind front
   9 */
  10 static
  11 void
  12 _memltofront(Memimage *i, Memimage *front, int fill)
  13 {
  14         Memlayer *l;
  15         Memscreen *s;
  16         Memimage *f, *ff, *rr;
  17         Rectangle x;
  18         int overlap;
  19
  20         l = i->layer;
  21         s = l->screen;
  22         while(l->front != front){
  23                 f = l->front;
  24                 x = l->screenr;
  25                 overlap = rectclip(&x, f->layer->screenr);
  26                 if(overlap){
  27                         memlhide(f, x);
  28                         f->layer->clear = 0;
  29                 }
  30                 /* swap l and f in screen's list */
  31                 ff = f->layer->front;
  32                 rr = l->rear;
  33                 if(ff == nil)
  34                         s->frontmost = i;
  35                 else
  36                         ff->layer->rear = i;
  37                 if(rr == nil)
  38                         s->rearmost = f;
  39                 else
  40                         rr->layer->front = f;
  41                 l->front = ff;
  42                 l->rear = f;
  43                 f->layer->front = i;
  44                 f->layer->rear = rr;
  45                 if(overlap && fill)
  46                         memlexpose(i, x);
  47         }
  48 }
  49
  50 void
  51 _memltofrontfill(Memimage *i, int fill)
  52 {
  53         _memltofront(i, nil, fill);
  54         _memlsetclear(i->layer->screen);
  55 }
  56
  57 void
  58 memltofront(Memimage *i)
  59 {
  60         _memltofront(i, nil, 1);
  61         _memlsetclear(i->layer->screen);
  62 }
  63
  64 void
  65 memltofrontn(Memimage **ip, int n)
  66 {
  67         Memimage *i, *front;
  68         Memscreen *s;
  69
  70         if(n == 0)
  71                 return;
  72         front = nil;
  73         while(--n >= 0){
  74                 i = *ip++;
  75                 _memltofront(i, front, 1);
  76                 front = i;
  77         }
  78         s = front->layer->screen;
  79         _memlsetclear(s);
  80 }