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/*
Comapre Args
Copyright (C) 2006 Yangli Hector Yee
This program is free software; you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program;
if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
*/
#include "args.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const char* copyright =
"PerceptualDiff version 1.0, Copyright (C) 2006 Yangli Hector Yee\n\
PerceptualDiff comes with ABSOLUTELY NO WARRANTY;\n\
This is free software, and you are welcome\n\
to redistribute it under certain conditions;\n\
See the GPL page for details: http://www.gnu.org/copyleft/gpl.html\n\n";
static const char *usage =
"PeceptualDiff image1.tif image2.tif\n\n\
Compares image1.tif and image2.tif using a perceptually based image metric\n\
Options:\n\
\t-verbose : Turns on verbose mode\n\
\t-fov deg : Field of view in degrees (0.1 to 89.9)\n\
\t-threshold p : #pixels p below which differences are ignored\n\
\t-gamma g : Value to convert rgb into linear space (default 2.2)\n\
\t-luminance l : White luminance (default 100.0 cdm^-2)\n\
\n\
\n Note: Input files can also be in the PNG format\
\n";
void
args_init (args_t *args)
{
args->surface_a = NULL;
args->surface_b = NULL;
args->Verbose = false;
args->FieldOfView = 45.0f;
args->Gamma = 2.2f;
args->ThresholdPixels = 100;
args->Luminance = 100.0f;
}
void
args_fini (args_t *args)
{
cairo_surface_destroy (args->surface_a);
cairo_surface_destroy (args->surface_b);
}
bool
args_parse (args_t *args, int argc, char **argv)
{
int i;
if (argc < 3) {
fprintf (stderr, "%s", copyright);
fprintf (stderr, "%s", usage);
return false;
}
for (i = 0; i < argc; i++) {
if (i == 1) {
args->surface_a = cairo_image_surface_create_from_png (argv[1]);
if (cairo_surface_status (args->surface_a))
{
fprintf (stderr, "FAIL: Cannot open %s: %s\n",
argv[1], cairo_status_to_string (cairo_surface_status (args->surface_a)));
return false;
}
} else if (i == 2) {
args->surface_b = cairo_image_surface_create_from_png (argv[2]);
if (cairo_surface_status (args->surface_b))
{
fprintf (stderr, "FAIL: Cannot open %s: %s\n",
argv[2], cairo_status_to_string (cairo_surface_status (args->surface_b)));
return false;
}
} else {
if (strstr(argv[i], "-fov")) {
if (i + 1 < argc) {
args->FieldOfView = (float) atof(argv[i + 1]);
}
} else if (strstr(argv[i], "-verbose")) {
args->Verbose = true;
} else if (strstr(argv[i], "-threshold")) {
if (i + 1 < argc) {
args->ThresholdPixels = atoi(argv[i + 1]);
}
} else if (strstr(argv[i], "-gamma")) {
if (i + 1 < argc) {
args->Gamma = (float) atof(argv[i + 1]);
}
}else if (strstr(argv[i], "-luminance")) {
if (i + 1 < argc) {
args->Luminance = (float) atof(argv[i + 1]);
}
}
}
} /* i */
return true;
}
void
args_print (args_t *args)
{
printf("Field of view is %f degrees\n", args->FieldOfView);
printf("Threshold pixels is %d pixels\n", args->ThresholdPixels);
printf("The Gamma is %f\n", args->Gamma);
printf("The Display's luminance is %f candela per meter squared\n", args->Luminance);
}
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