tests/alpha_symmetric_transform.c

   1 /* babl - dynamically extendable universal pixel conversion library.
   2  * Copyright (C) 2005, 2017 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 "config.h"
  20 #include <math.h>
  21 #include "babl-internal.h"
  22
  23 #define TOLERANCE    0.001
  24 #define PIXELS       12
  25
  26 float source_buf [PIXELS * 4] =
  27 { 10.0, 1.0, 0.1,      1.0,
  28   10.0, 1.0, 0.1,      0.5,
  29   10.0, 1.0, 0.1,      0.1,
  30   10.0, 1.0, 0.1,      0.01,
  31   10.0, 1.0, 0.1,     -0.01,
  32   10.0, 1.0, 0.1,      1.5,
  33   10.0, 1.0, 0.0001,   0.000001,
  34   10.0, 1.0, 0.1 ,    -0.00001,
  35   10.0, 1.0, 0.1,      0.0,
  36   10.0, 1.0, 0.1,     -0.5,
  37   1000.0,10000.0, 100000.0, 0.001,
  38   5000.0,50000.0, 500000.0, 0.01,
  39 };
  40
  41 float bounce_buf [PIXELS * 4];
  42 float destination_buf [PIXELS * 4];
  43
  44 static int
  45 test (void)
  46 {
  47   int i;
  48   int OK = 1;
  49
  50   babl_process (babl_fish ("RGBA float", "RaGaBaA float"),
  51                 source_buf, bounce_buf,
  52                 PIXELS);
  53   babl_process (babl_fish ("RaGaBaA float", "RGBA float"),
  54                 bounce_buf, destination_buf,
  55                 PIXELS);
  56
  57   for (i = 0; i < PIXELS; i++)
  58     {
  59       for (int c = 0; c < 4; c++)
  60       {
  61       if (fabs (destination_buf[i*4+c] - source_buf[i*4+c]) > TOLERANCE)
  62         {
  63           babl_log ("separate alpha %i.%i: %.9f!=%.9f(ref)  ", i, c, destination_buf[i*4+c],
  64                                                   source_buf[i*4+c]);
  65           OK = 0;
  66         }
  67      //   fprintf (stdout, "%.19f ", destination_buf[i*4+c]);
  68       }
  69     //  fprintf (stdout, "\n");
  70     }
  71
  72   fprintf (stdout, "\n");
  73
  74   babl_process (babl_fish ("RaGaBaA float", "RGBA float"),
  75                 source_buf, bounce_buf,
  76                 PIXELS);
  77   babl_process (babl_fish ("RGBA float", "RaGaBaA float"),
  78                 bounce_buf, destination_buf,
  79                 PIXELS);
  80
  81   for (i = 0; i < PIXELS; i++)
  82     {
  83       for (int c = 0; c < 4; c++)
  84       {
  85       if (fabs (destination_buf[i*4+c] - source_buf[i*4+c]) > TOLERANCE)
  86         {
  87           babl_log ("associatd-alpha %i.%i: %.9f!=%.9f(ref)  ", i, c, destination_buf[i*4+c],
  88                                                   source_buf[i*4+c]);
  89           OK = 0;
  90         }
  91       //  fprintf (stdout, "%.19f ", destination_buf[i*4+c]);
  92       }
  93     //  fprintf (stdout, "\n");
  94     }
  95
  96
  97   if (!OK)
  98     return -1;
  99   return 0;
 100 }
 101
 102 int
 103 main (void)
 104 {
 105   babl_init ();
 106   if (test ())
 107     return -1;
 108   babl_exit ();
 109   return 0;
 110 }