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/*
Copyright (C) 2012-2014 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 "transfer_function.h"
namespace dcp {
/** A transfer function which for an input x gives an output y where
*
* y = x / B for x <= threshold
* y = ((x + A) / (1 + A))^power for x > threshold
*/
class ModifiedGammaTransferFunction : public TransferFunction
{
public:
ModifiedGammaTransferFunction (float power, float threshold, float A, float B);
float power () const {
return _power;
}
float threshold () const {
return _threshold;
}
float A () const {
return _A;
}
float B () const {
return _B;
}
bool about_equal (boost::shared_ptr<const TransferFunction>, float epsilon) const;
protected:
float * make_lut (int bit_depth) const;
private:
float _power;
float _threshold;
float _A;
float _B;
};
}
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