root/ext/gd/libgd/gdparttopng.c

DEFINITIONS

1. main

   1 #include <stdio.h>
   2 #include <stdlib.h>             /* For atoi */
   3 #include "gd.h"
   4 
   5 /* A short program which converts a .png file into a .gd file, for
   6    your convenience in creating images on the fly from a
   7    basis image that must be loaded quickly. The .gd format
   8    is not intended to be a general-purpose format. */
   9 
  10 int
  11 main (int argc, char **argv)
  12 {
  13   gdImagePtr im;
  14   FILE *in, *out;
  15   int x, y, w, h;
  16 
  17   if (argc != 7)
  18     {
  19       fprintf (stderr, "Usage: gdparttopng filename.gd filename.png x y w h\n");
  20       exit (1);
  21     }
  22   in = fopen (argv[1], "rb");
  23   if (!in)
  24     {
  25       fprintf (stderr, "Input file does not exist!\n");
  26       exit (1);
  27     }
  28 
  29   x = atoi (argv[3]);
  30   y = atoi (argv[4]);
  31   w = atoi (argv[5]);
  32   h = atoi (argv[6]);
  33 
  34   printf ("Extracting from (%d, %d), size is %dx%d\n", x, y, w, h);
  35 
  36   im = gdImageCreateFromGd2Part (in, x, y, w, h);
  37   fclose (in);
  38   if (!im)
  39     {
  40       fprintf (stderr, "Input is not in GD2 format!\n");
  41       exit (1);
  42     }
  43   out = fopen (argv[2], "wb");
  44   if (!out)
  45     {
  46       fprintf (stderr, "Output file cannot be written to!\n");
  47       gdImageDestroy (im);
  48       exit (1);
  49     }
  50 #ifdef HAVE_LIBPNG
  51   gdImagePng (im, out);
  52 #else
  53   fprintf(stderr, "No PNG library support.\n");
  54 #endif
  55   fclose (out);
  56   gdImageDestroy (im);
  57 
  58   return 0;
  59 }