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/*
Compare Args
Copyright (C) 2006-2011 Yangli Hector Yee
Copyright (C) 2011-2016 Steven Myint, Jeff Terrace
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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "compare_args.h"
#include "rgba_image.h"
#include <cassert>
#include <ciso646>
#include <climits>
#include <cstdlib>
#include <iostream>
#include <stdexcept>
#include <sstream>
namespace pdiff
{
static const auto VERSION = "2.1";
static const auto USAGE =
"Usage: perceptualdiff [options] image1 image2\n"
"\n"
"Compares image1 and image2 using a perceptually based image metric.\n"
"Images can be in any FreeImage-supported format: TIF, PNG, etc.\n"
"\n"
"Options:\n"
" --verbose Turn on verbose mode\n"
" --fov deg Field of view in degrees [0.1, 89.9] (default: 45.0)\n"
" --threshold p Number of pixels p below which differences are ignored\n"
" --gamma g Value to convert rgb into linear space (default: 2.2)\n"
" --luminance l White luminance (default: 100.0 cdm^-2)\n"
" --luminance-only Only consider luminance; ignore chroma (color) in the\n"
" comparison\n"
" --color-factor How much of color to use [0.0, 1.0] (default: 1.0)\n"
" --down-sample How many powers of two to down sample the image\n"
" (default: 0)\n"
" --scale Scale images to match each other's dimensions\n"
" --sum-errors Print a sum of the luminance and color differences\n"
" --output o Write difference to the file o\n"
" --version Print version\n"
"\n";
static bool option_matches(const char *arg, const std::string &option_name)
{
const auto string_arg = std::string(arg);
return (string_arg == "--" + option_name) or
(string_arg == "-" + option_name);
}
CompareArgs::CompareArgs(int argc, char **argv)
: verbose_(false),
sum_errors_(false),
down_sample_(0)
{
parse_args(argc, argv);
}
static void print_help()
{
std::cout << USAGE;
std::cout << "\n"
<< "OpenMP status: ";
#ifdef _OPENMP
std::cout << "enabled\n";
#else
std::cout << "disabled\n";
#endif
}
void CompareArgs::parse_args(const int argc, char **argv)
{
if (argc <= 1)
{
print_help();
exit(EXIT_FAILURE);
}
auto image_count = 0u;
const char *output_file_name = nullptr;
auto scale = false;
for (auto i = 1; i < argc; i++)
{
try
{
if (option_matches(argv[i], "help") or
option_matches(argv[i], "h"))
{
print_help();
exit(EXIT_SUCCESS);
}
else if (option_matches(argv[i], "fov"))
{
if (++i < argc)
{
parameters_.field_of_view = std::stof(argv[i]);
}
}
else if (option_matches(argv[i], "verbose"))
{
verbose_ = true;
}
else if (option_matches(argv[i], "threshold"))
{
if (++i < argc)
{
auto temporary = std::stoi(argv[i]);
if (temporary < 0)
{
throw PerceptualDiffException(
"-threshold must be positive");
}
parameters_.threshold_pixels =
static_cast<unsigned int>(temporary);
}
}
else if (option_matches(argv[i], "gamma"))
{
if (++i < argc)
{
parameters_.gamma = std::stof(argv[i]);
}
}
else if (option_matches(argv[i], "luminance"))
{
if (++i < argc)
{
parameters_.luminance = std::stof(argv[i]);
}
}
else if (option_matches(argv[i], "luminance-only") or
option_matches(argv[i], "luminanceonly"))
{
parameters_.luminance_only = true;
}
else if (option_matches(argv[i], "sum-errors"))
{
sum_errors_ = true;
}
else if (option_matches(argv[i], "color-factor") or
option_matches(argv[i], "colorfactor"))
{
if (++i < argc)
{
parameters_.color_factor = std::stof(argv[i]);
}
}
else if (option_matches(argv[i], "down-sample") or
option_matches(argv[i], "downsample"))
{
if (++i < argc)
{
auto temporary = std::stoi(argv[i]);
if (temporary < 0)
{
throw PerceptualDiffException(
"--downsample must be positive");
}
down_sample_ = static_cast<unsigned int>(temporary);
assert(down_sample_ <= INT_MAX);
}
}
else if (option_matches(argv[i], "scale"))
{
scale = true;
}
else if (option_matches(argv[i], "output"))
{
if (++i < argc)
{
output_file_name = argv[i];
}
}
else if (option_matches(argv[i], "version"))
{
std::cout << "perceptualdiff " << VERSION << "\n";
exit(EXIT_SUCCESS);
}
else if (image_count < 2)
{
auto image = read_from_file(argv[i]);
++image_count;
if (image_count == 1)
{
image_a_ = image;
}
else
{
image_b_ = image;
}
}
else
{
std::cerr << "Warning: option/file \"" << argv[i]
<< "\" ignored\n";
}
}
catch (const PerceptualDiffException &exception)
{
std::string reason = "";
if (not std::string(exception.what()).empty())
{
reason = std::string("; ") + exception.what();
}
throw ParseException(
"Invalid argument (" + std::string(argv[i]) + ") for " +
argv[i - 1] + reason);
}
catch (const std::invalid_argument &exception)
{
throw ParseException(
"Invalid argument (" + std::string(argv[i]) + ") for " +
argv[i - 1]);
}
}
if (not image_a_ or not image_b_)
{
std::cerr << "Not enough image files specified\n";
exit(EXIT_FAILURE);
}
for (auto i = 0u; i < down_sample_; i++)
{
const auto tmp_a = image_a_->down_sample();
const auto tmp_b = image_b_->down_sample();
if (tmp_a and tmp_b)
{
image_a_ = tmp_a;
image_b_ = tmp_b;
}
else
{
break;
}
if (verbose_)
{
std::cout << "Downsampling by " << (1 << (i + 1)) << "\n";
}
}
if (scale and
(image_a_->get_width() != image_b_->get_width() or
image_a_->get_height() != image_b_->get_height()))
{
auto min_width = image_a_->get_width();
if (image_b_->get_width() < min_width)
{
min_width = image_b_->get_width();
}
auto min_height = image_a_->get_height();
if (image_b_->get_height() < min_height)
{
min_height = image_b_->get_height();
}
if (verbose_)
{
std::cout << "Scaling to " << min_width << " x " << min_height
<< "\n";
}
auto tmp = image_a_->down_sample(min_width, min_height);
if (tmp)
{
image_a_ = tmp;
}
tmp = image_b_->down_sample(min_width, min_height);
if (tmp)
{
image_b_ = tmp;
}
}
if (output_file_name)
{
image_difference_ = std::make_shared<RGBAImage>(image_a_->get_width(),
image_a_->get_height(),
output_file_name);
}
}
void CompareArgs::print_args() const
{
std::cout
<< "Field of view is " << parameters_.field_of_view << " degrees\n"
<< "Threshold pixels is " << parameters_.threshold_pixels
<< " pixels\n"
<< "The gamma is " << parameters_.gamma << "\n"
<< "The display's luminance is " << parameters_.luminance
<< " candela per meter squared\n";
}
}
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