demos/c_simple/weighted_median.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    Convolution filter example.
  26
  27   */
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <errno.h>
  32
  33 #include <GP.h>
  34
  35 struct callback_priv {
  36         char *op;
  37         char *name;
  38 };
  39
  40 static int progress_callback(GP_ProgressCallback *self)
  41 {
  42         struct callback_priv *priv = self->priv;
  43
  44         printf("\r%s '%s' %3.1f%%", priv->op, priv->name, self->percentage);
  45         fflush(stdout);
  46
  47         /*
  48          * It's important to return zero as non-zero return value
  49          * aborts the operation.
  50          */
  51         return 0;
  52 }
  53
  54 int main(int argc, char *argv[])
  55 {
  56         GP_Pixmap *img;
  57         struct callback_priv priv;
  58         GP_ProgressCallback callback = {.callback = progress_callback,
  59                                         .priv = &priv};
  60
  61         if (argc != 2) {
  62                 fprintf(stderr, "Takes an image as an parameter\n");
  63                 return 1;
  64         }
  65
  66         priv.op   = "Loading";
  67         priv.name = argv[1];
  68
  69         img = GP_LoadImage(argv[1], &callback);
  70
  71         if (img == NULL) {
  72                 fprintf(stderr, "Failed to load image '%s': %s\n", argv[1],
  73                         strerror(errno));
  74                 return 1;
  75         }
  76
  77         printf("\n");
  78
  79         unsigned int circle[] = {
  80                 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
  81                 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
  82                 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
  83                 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
  84                 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  85                 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  86                 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  87                 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
  88                 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
  89                 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
  90                 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
  91         };
  92
  93         unsigned int calpen[] = {
  94                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
  95                 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0,
  96                 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
  97                 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
  98                 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
  99                 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
 100                 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
 101                 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
 102                 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
 103                 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 104                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 105         };
 106
 107         unsigned int cross[] = {
 108                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 109                 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0,
 110                 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0,
 111                 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0,
 112                 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0,
 113                 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
 114                 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0,
 115                 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0,
 116                 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0,
 117                 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0,
 118                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 119         };
 120
 121         unsigned int crazy[] = {
 122                 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
 123                 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
 124                 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
 125                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 126                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 127                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 128                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 129                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 130                 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
 131                 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
 132                 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
 133                 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
 134         };
 135
 136         GP_MedianWeights weights = {
 137                 .w = 11,
 138                 .h = 11,
 139                 .weights = circle,
 140         };
 141
 142         priv.op = "Weighted Median";
 143
 144         GP_Pixmap *res = GP_FilterWeightedMedianAlloc(img, &weights, &callback);
 145
 146         printf("\n");
 147
 148         priv.op   = "Saving";
 149         priv.name = "out.png";
 150
 151         if (GP_SavePNG(res, "out.png", &callback)) {
 152                 fprintf(stderr, "Failed to save image: %s", strerror(errno));
 153                 return 1;
 154         }
 155
 156         printf("\n");
 157
 158         return 0;
 159 }