Grcov report - perceptualdiff.c

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/*

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  PerceptualDiff - a program that compares two images using a perceptual metric

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  based on the paper :

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  A perceptual metric for production testing. Journal of graphics tools, 9(4):33-40, 2004, Hector Yee

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  Copyright (C) 2006 Yangli Hector Yee

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  This program is free software; you can redistribute it and/or modify it under the terms of the

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  GNU General Public License as published by the Free Software Foundation; either version 2 of the License,

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  or (at your option) any later version.

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  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

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  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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  See the GNU General Public License for more details.

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  You should have received a copy of the GNU General Public License along with this program;

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  if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA

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*/

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#include <stdio.h>

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#include <stdint.h>

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#include <string.h>

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#include <math.h>

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#include "lpyramid.h"

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#include "args.h"

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#include "pdiff.h"

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static bool Yee_Compare(args_t *args)

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    unsigned int width_a, height_a, stride_a;

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    unsigned char *data_a, *row_a;

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    uint32_t *pixel_a;

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    unsigned int width_b, height_b, stride_b;

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    unsigned char *data_b, *row_b;

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    uint32_t *pixel_b;

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    unsigned int x, y, pixels_failed;

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    bool identical = true;

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    width_a = cairo_image_surface_get_width (args->surface_a);

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    height_a = cairo_image_surface_get_height (args->surface_a);

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    stride_a = cairo_image_surface_get_stride (args->surface_a);

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    data_a = cairo_image_surface_get_data (args->surface_a);

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    width_b = cairo_image_surface_get_width (args->surface_b);

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    height_b = cairo_image_surface_get_height (args->surface_b);

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    stride_b = cairo_image_surface_get_stride (args->surface_b);

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    data_b = cairo_image_surface_get_data (args->surface_b);

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    if ((width_a != width_b) || (height_a != height_b)) {

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	printf ("FAIL: Image dimensions do not match\n");

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	return false;

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    identical = true;

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    for (y = 0; y < height_a; y++) {

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	row_a = data_a + y * stride_a;

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	row_b = data_b + y * stride_b;

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	pixel_a = (uint32_t *) row_a;

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	pixel_b = (uint32_t *) row_b;

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	for (x = 0; x < width_a; x++) {

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	    if (*pixel_a != *pixel_b) {

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		identical = false;

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	    pixel_a++;

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	    pixel_b++;

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    if (identical) {

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	printf ("PASS: Images are binary identical\n");

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	return true;

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    pixels_failed = pdiff_compare (args->surface_a, args->surface_b,

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				   args->Gamma, args->Luminance,

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				   args->FieldOfView);

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    if (pixels_failed < args->ThresholdPixels) {

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	printf ("PASS: Images are perceptually indistinguishable\n");

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	return true;

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    printf("FAIL: Images are visibly different\n"

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	   "%d pixels are different\n", pixels_failed);

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    return false;

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int main(int argc, char **argv)

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    args_t args;

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    args_init (&args);

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    if (!args_parse (&args, argc, argv)) {

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	return -1;

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    } else {

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	if (args.Verbose)

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	    args_print (&args);

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    return ! Yee_Compare(&args);

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