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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.
*/
/** @file src/transfer_function.h
* @brief TransferFunction class.
*/
#ifndef LIBDCP_TRANSFER_FUNCTION_H
#define LIBDCP_TRANSFER_FUNCTION_H
#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread/mutex.hpp>
#include <map>
namespace dcp {
/** @class TransferFunction
* @brief A transfer function represented by a lookup table.
*/
class TransferFunction : public boost::noncopyable
{
public:
virtual ~TransferFunction ();
/** @return A look-up table (of size 2^bit_depth) whose values range from 0 to 1 */
double const * lut (int bit_depth, bool inverse) const;
virtual bool about_equal (boost::shared_ptr<const TransferFunction> other, double epsilon) const = 0;
protected:
/** Make a LUT and return an array allocated by new */
virtual double * make_lut (int bit_depth, bool inverse) const = 0;
private:
mutable std::map<std::pair<int, bool>, double*> _luts;
/** mutex to protect _luts */
mutable boost::mutex _mutex;
};
}
#endif
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