sys/src/libmemlayer/ldelete.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include <memdraw.h>
   5 #include <memlayer.h>
   6
   7 void
   8 memldelete(Memimage *i)
   9 {
  10         Memscreen *s;
  11         Memlayer *l;
  12
  13         l = i->layer;
  14         /* free backing store and disconnect refresh, to make pushback fast */
  15         freememimage(l->save);
  16         l->save = nil;
  17         l->refreshptr = nil;
  18         memltorear(i);
  19
  20         /* window is now the rearmost;  clean up screen structures and deallocate */
  21         s = i->layer->screen;
  22         if(s->fill){
  23                 i->clipr = i->r;
  24                 memdraw(i, i->r, s->fill, i->r.min, nil, i->r.min, S);
  25         }
  26         if(l->front){
  27                 l->front->layer->rear = nil;
  28                 s->rearmost = l->front;
  29         }else{
  30                 s->frontmost = nil;
  31                 s->rearmost = nil;
  32         }
  33         free(l);
  34         freememimage(i);
  35 }
  36
  37 /*
  38  * Just free the data structures, don't do graphics
  39  */
  40 void
  41 memlfree(Memimage *i)
  42 {
  43         Memlayer *l;
  44
  45         l = i->layer;
  46         freememimage(l->save);
  47         free(l);
  48         freememimage(i);
  49 }
  50
  51 void
  52 _memlsetclear(Memscreen *s)
  53 {
  54         Memimage *i, *j;
  55         Memlayer *l;
  56
  57         for(i=s->rearmost; i; i=i->layer->front){
  58                 l = i->layer;
  59                 l->clear = rectinrect(l->screenr, l->screen->image->clipr);
  60                 if(l->clear)
  61                         for(j=l->front; j; j=j->layer->front)
  62                                 if(rectXrect(l->screenr, j->layer->screenr)){
  63                                         l->clear = 0;
  64                                         break;
  65                                 }
  66         }
  67 }