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 #include <pool.h>
   7
   8 /*
   9  * Pull i towards top of screen, just behind front
  10 */
  11 static
  12 void
  13 _memltofront(Memimage *i, Memimage *front, int fill)
  14 {
  15         Memlayer *l;
  16         Memscreen *s;
  17         Memimage *f, *ff, *rr;
  18         Rectangle x;
  19         int overlap;
  20
  21         l = i->layer;
  22         s = l->screen;
  23         while(l->front != front){
  24                 f = l->front;
  25                 x = l->screenr;
  26                 overlap = rectclip(&x, f->layer->screenr);
  27                 if(overlap){
  28                         memlhide(f, x);
  29                         f->layer->clear = 0;
  30                 }
  31                 /* swap l and f in screen's list */
  32                 ff = f->layer->front;
  33                 rr = l->rear;
  34                 if(ff == nil)
  35                         s->frontmost = i;
  36                 else
  37                         ff->layer->rear = i;
  38                 if(rr == nil)
  39                         s->rearmost = f;
  40                 else
  41                         rr->layer->front = f;
  42                 l->front = ff;
  43                 l->rear = f;
  44                 f->layer->front = i;
  45                 f->layer->rear = rr;
  46                 if(overlap && fill)
  47                         memlexpose(i, x);
  48         }
  49 }
  50
  51 void
  52 _memltofrontfill(Memimage *i, int fill)
  53 {
  54         _memltofront(i, nil, fill);
  55         _memlsetclear(i->layer->screen);
  56 }
  57
  58 void
  59 memltofront(Memimage *i)
  60 {
  61         _memltofront(i, nil, 1);
  62         _memlsetclear(i->layer->screen);
  63 }
  64
  65 void
  66 memltofrontn(Memimage **ip, int n)
  67 {
  68         Memimage *i, *front;
  69         Memscreen *s;
  70
  71         if(n == 0)
  72                 return;
  73         front = nil;
  74         while(--n >= 0){
  75                 i = *ip++;
  76                 _memltofront(i, front, 1);
  77                 front = i;
  78         }
  79         s = front->layer->screen;
  80         _memlsetclear(s);
  81 }