/*
- Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
- This program is free software; you can redistribute it and/or modify
+ This file is part of libdcp.
+
+ libdcp 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,
+ libdcp 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.
+ along with libdcp. If not, see <http://www.gnu.org/licenses/>.
+
+ In addition, as a special exception, the copyright holders give
+ permission to link the code of portions of this program with the
+ OpenSSL library under certain conditions as described in each
+ individual source file, and distribute linked combinations
+ including the two.
+ You must obey the GNU General Public License in all respects
+ for all of the code used other than OpenSSL. If you modify
+ file(s) with this exception, you may extend this exception to your
+ version of the file(s), but you are not obligated to do so. If you
+ do not wish to do so, delete this exception statement from your
+ version. If you delete this exception statement from all source
+ files in the program, then also delete it here.
*/
+
+/** @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>
+#include <memory>
+
namespace dcp {
-class TransferFunction : public boost::noncopyable
+
+/** @class TransferFunction
+ * @brief A transfer function represented by a lookup table.
+ */
+class TransferFunction
{
public:
- TransferFunction (bool inverse);
-
+ TransferFunction () {}
+
+ TransferFunction (TransferFunction const&) = delete;
+ TransferFunction& operator= (TransferFunction const&) = delete;
+
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) const;
+ double const * lut (int bit_depth, bool inverse) const;
- virtual bool about_equal (boost::shared_ptr<const TransferFunction> other, double epsilon) const;
+ virtual bool about_equal (std::shared_ptr<const TransferFunction> other, double epsilon) const = 0;
protected:
- virtual double * make_lut (int bit_depth) const = 0;
+ /** Make a LUT and return an array allocated by new */
+ virtual double * make_lut (int bit_depth, bool inverse) const = 0;
- bool _inverse;
-
-private:
- mutable std::map<int, double*> _luts;
+private:
+ mutable std::map<std::pair<int, bool>, double*> _luts;
+ /** mutex to protect _luts */
+ mutable boost::mutex _mutex;
};
+
}
+
#endif