tests/xyz_to_lab.c

   1 /* babl - dynamically extendable universal pixel conversion library.
   2  * Copyright (C) 2005, Øyvind Kolås.
   3  *
   4  * This library 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 3 of the License, or (at your option) any later version.
   8  *
   9  * This library 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
  15  * Public License along with this library; if not, see
  16  * <https://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <math.h>
  20 #include <babl/babl.h>
  21 #include <stdio.h>
  22
  23 #define PIXELS       4
  24 #define TOLERANCE    0.05
  25
  26 float source_buf [PIXELS * 3] =
  27 { 0.950, 1.000, 1.089,
  28   1.000, 0.000, 0.000,
  29   0.000, 1.000, 0.000,
  30   0.000, 0.000, 1.000
  31 };
  32
  33 float reference_buf [PIXELS * 3] =
  34 { 100.00, -2.467186, -19.400648,
  35   0.0, 437.147125, 0.0,
  36   100.0, -431.034485, 172.4137,
  37   0.0, 0.0, -185.6406,
  38 };
  39
  40 float destination_buf [PIXELS * 3];
  41
  42 static int
  43 test (void)
  44 {
  45   int i;
  46   int OK = 1;
  47
  48   babl_process (babl_fish ("CIE XYZ float", "CIE Lab float"),
  49                 source_buf, destination_buf,
  50                 PIXELS);
  51
  52   for (i = 0; i < PIXELS * 3; i++)
  53     {
  54       if (fabs (1.0 * destination_buf[i] - reference_buf[i]) > TOLERANCE)
  55         {
  56           fprintf (stderr, "%2i (component: %2i%%3=%i, test no: %2i/3=%i) is %f should be %f\n",
  57                     i, i, i % 3, i, i / 3, destination_buf[i], reference_buf[i]);
  58           OK = 0;
  59         }
  60     }
  61   if (!OK)
  62     return -1;
  63   return 0;
  64 }
  65
  66 int
  67 main (void)
  68 {
  69   babl_init ();
  70   if (test ())
  71     return -1;
  72   babl_exit ();
  73   return 0;
  74 }