2 Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef LIBDCP_TRANSFER_FUNCTION_H
21 #define LIBDCP_TRANSFER_FUNCTION_H
23 #include <boost/noncopyable.hpp>
24 #include <boost/shared_ptr.hpp>
25 #include <boost/thread/mutex.hpp>
30 class TransferFunction : public boost::noncopyable
33 TransferFunction (bool inverse);
35 virtual ~TransferFunction ();
37 /** @return A look-up table (of size 2^bit_depth) whose values range from 0 to 1 */
38 double const * lut (int bit_depth) const;
40 virtual bool about_equal (boost::shared_ptr<const TransferFunction> other, double epsilon) const;
43 virtual double * make_lut (int bit_depth) const = 0;
48 mutable std::map<int, double*> _luts;
49 /** mutex to protect _luts */
50 mutable boost::mutex _mutex;