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/*
Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "colour_conversion.h"
#include "gamma_transfer_function.h"
#include "modified_gamma_transfer_function.h"
#include "colour_matrix.h"
using boost::shared_ptr;
using namespace dcp;
ColourConversion ColourConversion::srgb_to_xyz (
shared_ptr<const TransferFunction> (new ModifiedGammaTransferFunction (2.4, 0.04045, 0.055, 12.92)),
dcp::colour_matrix::srgb_to_xyz,
shared_ptr<const TransferFunction> (new GammaTransferFunction (2.6))
);
/* XXX: what sort of RGB is this...? */
ColourConversion ColourConversion::xyz_to_rgb (
shared_ptr<const TransferFunction> (new GammaTransferFunction (2.6)),
dcp::colour_matrix::xyz_to_rgb,
shared_ptr<const TransferFunction> (new GammaTransferFunction (2.2))
);
ColourConversion ColourConversion::rec709_to_xyz (
shared_ptr<const TransferFunction> (new ModifiedGammaTransferFunction (2.4, 0.081, 0.099, 4.5)),
dcp::colour_matrix::srgb_to_xyz,
shared_ptr<const TransferFunction> (new GammaTransferFunction (2.6))
);
ColourConversion::ColourConversion (
shared_ptr<const TransferFunction> in,
double const matrix[3][3],
shared_ptr<const TransferFunction> out
)
: _in (in)
, _matrix (3, 3)
, _out (out)
{
for (int i = 0; i < 3; ++i) {
for (int j = 0; j < 3; ++j) {
_matrix (i, j) = matrix[i][j];
}
}
}
bool
ColourConversion::about_equal (ColourConversion const & other, float epsilon) const
{
for (int i = 0; i < 3; ++i) {
for (int j = 0; j < 3; ++j) {
if (fabs (_matrix(i, j) - other._matrix(i, j)) > epsilon) {
return false;
}
}
}
return _in->about_equal (other._in, epsilon) && _out->about_equal (other._out, epsilon);
}
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