sys/src/cmd/jpg/topng.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include <memdraw.h>
   5 #include <ctype.h>
   6 #include <bio.h>
   7 #include <flate.h>
   8 #include "imagefile.h"
   9
  10 void
  11 usage(void)
  12 {
  13         fprint(2, "usage: topng [-c 'comment'] [-g 'gamma'] [file]\n");
  14         exits("usage");
  15 }
  16
  17 void
  18 main(int argc, char *argv[])
  19 {
  20         Biobuf bout;
  21         Memimage *i;
  22         int fd;
  23         char *err, *filename;
  24         ImageInfo II;
  25
  26         ARGBEGIN{
  27         case 'c':
  28                 II.comment = ARGF();
  29                 if(II.comment == nil)
  30                         usage();
  31                 II.fields_set |= II_COMMENT;
  32                 break;
  33         case 'g':
  34                 II.gamma = atof(ARGF());
  35                 if(II.gamma == 0.)
  36                         usage();
  37                 II.fields_set |= II_GAMMA;
  38                 break;
  39         case 't':
  40                 break;
  41         default:
  42                 usage();
  43         }ARGEND
  44
  45         if(Binit(&bout, 1, OWRITE) < 0)
  46                 sysfatal("Binit failed: %r");
  47         memimageinit();
  48
  49         if(argc == 0){
  50                 fd = 0;
  51                 filename = "<stdin>";
  52         }else{
  53                 fd = open(argv[0], OREAD);
  54                 if(fd < 0)
  55                         sysfatal("can't open %s: %r", argv[0]);
  56                 filename = argv[0];
  57         }
  58
  59         i = readmemimage(fd);
  60         if(i == nil)
  61                 sysfatal("can't readimage %s: %r", filename);
  62         close(fd);
  63
  64         err = memwritepng(&bout, i, &II);
  65         freememimage(i);
  66
  67         if(err != nil)
  68                 fprint(2, "topng: %s\n", err);
  69         exits(err);
  70 }