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/*
PerceptualDiff - a program that compares two images using a perceptual metric
based on the paper :
A perceptual metric for production testing. Journal of graphics tools, 9(4):33-40, 2004, Hector Yee
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 <stdio.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include "lpyramid.h"
#include "args.h"
#include "pdiff.h"
static bool Yee_Compare(args_t *args)
{
unsigned int width_a, height_a, stride_a;
unsigned char *data_a, *row_a;
uint32_t *pixel_a;
unsigned int width_b, height_b, stride_b;
unsigned char *data_b, *row_b;
uint32_t *pixel_b;
unsigned int x, y, pixels_failed;
bool identical = true;
width_a = cairo_image_surface_get_width (args->surface_a);
height_a = cairo_image_surface_get_height (args->surface_a);
stride_a = cairo_image_surface_get_stride (args->surface_a);
data_a = cairo_image_surface_get_data (args->surface_a);
width_b = cairo_image_surface_get_width (args->surface_b);
height_b = cairo_image_surface_get_height (args->surface_b);
stride_b = cairo_image_surface_get_stride (args->surface_b);
data_b = cairo_image_surface_get_data (args->surface_b);
if ((width_a != width_b) || (height_a != height_b)) {
printf ("FAIL: Image dimensions do not match\n");
return false;
}
identical = true;
for (y = 0; y < height_a; y++) {
row_a = data_a + y * stride_a;
row_b = data_b + y * stride_b;
pixel_a = (uint32_t *) row_a;
pixel_b = (uint32_t *) row_b;
for (x = 0; x < width_a; x++) {
if (*pixel_a != *pixel_b) {
identical = false;
}
pixel_a++;
pixel_b++;
}
}
if (identical) {
printf ("PASS: Images are binary identical\n");
return true;
}
pixels_failed = pdiff_compare (args->surface_a, args->surface_b,
args->Gamma, args->Luminance,
args->FieldOfView);
if (pixels_failed < args->ThresholdPixels) {
printf ("PASS: Images are perceptually indistinguishable\n");
return true;
}
printf("FAIL: Images are visibly different\n"
"%d pixels are different\n", pixels_failed);
return false;
}
int main(int argc, char **argv)
{
args_t args;
args_init (&args);
if (!args_parse (&args, argc, argv)) {
return -1;
} else {
if (args.Verbose)
args_print (&args);
}
return ! Yee_Compare(&args);
}
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