test/pdiff/args.c

   1 /*
   2   Comapre Args
   3   Copyright (C) 2006 Yangli Hector Yee
   4
   5   This program is free software; you can redistribute it and/or modify it under the terms of the
   6   GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
   7   or (at your option) any later version.
   8
   9   This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  10   without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11   See the GNU General Public License for more details.
  12
  13   You should have received a copy of the GNU General Public License along with this program;
  14   if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  15 */
  16
  17 #include "args.h"
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 static const char* copyright =
  23 "PerceptualDiff version 1.0, Copyright (C) 2006 Yangli Hector Yee\n\
  24 PerceptualDiff comes with ABSOLUTELY NO WARRANTY;\n\
  25 This is free software, and you are welcome\n\
  26 to redistribute it under certain conditions;\n\
  27 See the GPL page for details: http://www.gnu.org/copyleft/gpl.html\n\n";
  28
  29 static const char *usage =
  30 "PeceptualDiff image1.tif image2.tif\n\n\
  31    Compares image1.tif and image2.tif using a perceptually based image metric\n\
  32    Options:\n\
  33 \t-verbose       : Turns on verbose mode\n\
  34 \t-fov deg       : Field of view in degrees (0.1 to 89.9)\n\
  35 \t-threshold p   : #pixels p below which differences are ignored\n\
  36 \t-gamma g       : Value to convert rgb into linear space (default 2.2)\n\
  37 \t-luminance l   : White luminance (default 100.0 cdm^-2)\n\
  38 \n\
  39 \n Note: Input files can also be in the PNG format\
  40 \n";
  41
  42 void
  43 args_init (args_t *args)
  44 {
  45     args->surface_a = NULL;
  46     args->surface_b = NULL;
  47     args->Verbose = false;
  48     args->FieldOfView = 45.0f;
  49     args->Gamma = 2.2f;
  50     args->ThresholdPixels = 100;
  51     args->Luminance = 100.0f;
  52 }
  53
  54 void
  55 args_fini (args_t *args)
  56 {
  57     cairo_surface_destroy (args->surface_a);
  58     cairo_surface_destroy (args->surface_b);
  59 }
  60
  61 bool
  62 args_parse (args_t *args, int argc, char **argv)
  63 {
  64     int i;
  65     if (argc < 3) {
  66         fprintf (stderr, "%s", copyright);
  67         fprintf (stderr, "%s", usage);
  68         return false;
  69     }
  70     for (i = 0; i < argc; i++) {
  71         if (i == 1) {
  72             args->surface_a = cairo_image_surface_create_from_png (argv[1]);
  73             if (cairo_surface_status (args->surface_a))
  74             {
  75                 fprintf (stderr, "FAIL: Cannot open %s: %s\n",
  76                          argv[1], cairo_status_to_string (cairo_surface_status (args->surface_a)));
  77                 return false;
  78             }
  79         } else if (i == 2) {
  80             args->surface_b = cairo_image_surface_create_from_png (argv[2]);
  81             if (cairo_surface_status (args->surface_b))
  82             {
  83                 fprintf (stderr, "FAIL: Cannot open %s: %s\n",
  84                          argv[2], cairo_status_to_string (cairo_surface_status (args->surface_b)));
  85                 return false;
  86             }
  87         } else {
  88             if (strstr(argv[i], "-fov")) {
  89                 if (i + 1 < argc) {
  90                     args->FieldOfView = (float) atof(argv[i + 1]);
  91                 }
  92             } else if (strstr(argv[i], "-verbose")) {
  93                 args->Verbose = true;
  94             } else      if (strstr(argv[i], "-threshold")) {
  95                 if (i + 1 < argc) {
  96                     args->ThresholdPixels = atoi(argv[i + 1]);
  97                 }
  98             } else      if (strstr(argv[i], "-gamma")) {
  99                 if (i + 1 < argc) {
 100                     args->Gamma = (float) atof(argv[i + 1]);
 101                 }
 102             }else       if (strstr(argv[i], "-luminance")) {
 103                 if (i + 1 < argc) {
 104                     args->Luminance = (float) atof(argv[i + 1]);
 105                 }
 106             }
 107         }
 108     } /* i */
 109     return true;
 110 }
 111
 112 void
 113 args_print (args_t *args)
 114 {
 115     printf("Field of view is %f degrees\n", args->FieldOfView);
 116     printf("Threshold pixels is %d pixels\n", args->ThresholdPixels);
 117     printf("The Gamma is %f\n", args->Gamma);
 118     printf("The Display's luminance is %f candela per meter squared\n", args->Luminance);
 119 }