demos/c_simple/filters_symmetry.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23  /*
  24
  25    Symmetry filter example.
  26
  27   */
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <errno.h>
  32 #include <getopt.h>
  33
  34 #include <GP.h>
  35
  36 static void usage_and_exit(int ret)
  37 {
  38         int i;
  39         printf("filter_symmetry [-d debug_level] -s {");
  40
  41         for (i = 0; GP_FilterSymmetryNames[i+1] != NULL; i++)
  42                 printf("%s, ", GP_FilterSymmetryNames[i]);
  43
  44         printf("%s} image_in image_out\n", GP_FilterSymmetryNames[i]);
  45
  46         exit(ret);
  47 }
  48
  49 int main(int argc, char *argv[])
  50 {
  51         GP_Pixmap *src, *res;
  52         const char *symmetry = NULL;
  53         int opt, sym, debug = 0;
  54
  55         /* Parse program options */
  56         while ((opt = getopt(argc, argv, "d:hs:")) != -1) {
  57                 switch (opt) {
  58                 case 's':
  59                         symmetry = optarg;
  60                 break;
  61                 case 'h':
  62                         usage_and_exit(0);
  63                 break;
  64                 case 'd':
  65                         debug = atoi(optarg);
  66                 break;
  67                 default:
  68                         usage_and_exit(1);
  69                 }
  70         }
  71
  72         /* Turn on debug messages */
  73         GP_SetDebugLevel(debug);
  74
  75         if (symmetry == NULL) {
  76                 printf("Symmetry not specified\n");
  77                 usage_and_exit(1);
  78         }
  79
  80         if (argc - optind != 2) {
  81                 printf("Input and output image not specified\n");
  82                 usage_and_exit(1);
  83         }
  84
  85         sym = GP_FilterSymmetryByName(symmetry);
  86
  87         if (sym < 0) {
  88                 printf("Invalid symmetry name '%s'\n", symmetry);
  89                 usage_and_exit(1);
  90         }
  91
  92         /* Load Image  */
  93         src = GP_LoadImage(argv[optind], NULL);
  94
  95         if (src == NULL) {
  96                 fprintf(stderr, "Failed to load image '%s': %s\n",
  97                         argv[optind], strerror(errno));
  98                 return 1;
  99         }
 100
 101         /* Apply a symmetry filter */
 102         res = GP_FilterSymmetryAlloc(src, sym, NULL);
 103
 104         /* Save Image */
 105         if (GP_SaveImage(res, argv[optind+1], NULL)) {
 106                 fprintf(stderr, "Failed to save image '%s': %s\n",
 107                         argv[optind+1], strerror(errno));
 108                 return 1;
 109         }
 110
 111         /* Cleanup */
 112         GP_PixmapFree(src);
 113         GP_PixmapFree(res);
 114
 115         return 0;
 116 }