sys/src/cmd/scat/display.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <bio.h>
   4 #include <draw.h>
   5 #include "sky.h"
   6
   7 void
   8 displaypic(Picture *pic)
   9 {
  10         int p[2];
  11         int i, n;
  12         uchar *a;
  13
  14
  15         if(pipe(p) < 0){
  16                 fprint(2, "pipe failed: %r\n");
  17                 return;
  18         }
  19         switch(rfork(RFPROC|RFFDG|RFNOTEG|RFNOWAIT)){
  20         case -1:
  21                 fprint(2, "fork failed: %r\n");
  22                 return;
  23
  24         case 0:
  25                 close(p[1]);
  26                 dup(p[0], 0);
  27                 close(p[0]);
  28                 execl("/bin/page", "page", "-w", nil);
  29                 fprint(2, "exec failed: %r\n");
  30                 exits("exec");
  31
  32         default:
  33                 close(p[0]);
  34                 fprint(p[1], "%11s %11d %11d %11d %11d ",
  35                         "k8", pic->minx, pic->miny, pic->maxx, pic->maxy);
  36                 n = (pic->maxx-pic->minx)*(pic->maxy-pic->miny);
  37                 /* release the memory as we hand it off; this could be a big piece of data */
  38                 a = pic->data;
  39                 while(n > 0){
  40                         i = 8192 - (((uintptr)a)&8191);
  41                         if(i > n)
  42                                 i = n;
  43                         if(write(p[1], a, i)!=i)
  44                                 fprint(2, "write error: %r\n");
  45                         if(i == 8192)   /* page aligned */
  46                                 segfree(a, i);
  47                         n -= i;
  48                         a += i;
  49                 }
  50                 free(pic->data);
  51                 free(pic);
  52                 close(p[1]);
  53                 break;
  54         }
  55 }
  56
  57 void
  58 displayimage(Image *im)
  59 {
  60         int p[2];
  61
  62         if(pipe(p) < 0){
  63                 fprint(2, "pipe failed: %r\n");
  64                 return;
  65         }
  66         switch(rfork(RFPROC|RFFDG|RFNOTEG|RFNOWAIT)){
  67         case -1:
  68                 fprint(2, "fork failed: %r\n");
  69                 return;
  70
  71         case 0:
  72                 close(p[1]);
  73                 dup(p[0], 0);
  74                 close(p[0]);
  75                 execl("/bin/page", "page", "-w", nil);
  76                 fprint(2, "exec failed: %r\n");
  77                 exits("exec");
  78
  79         default:
  80                 close(p[0]);
  81                 writeimage(p[1], im, 0);
  82                 freeimage(im);
  83                 close(p[1]);
  84                 break;
  85         }
  86 }