/*
- 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.cc
+ * @brief TransferFunction
+ */
+
+
#include "transfer_function.h"
#include <cmath>
-using std::pow;
-using std::map;
-using std::pair;
+
using std::make_pair;
-using boost::shared_ptr;
+using std::pair;
+using std::pow;
+using std::shared_ptr;
+using std::vector;
using namespace dcp;
-TransferFunction::~TransferFunction ()
+
+vector<double> const&
+TransferFunction::double_lut(double from, double to, int bit_depth, bool inverse) const
{
boost::mutex::scoped_lock lm (_mutex);
+ return double_lut_unlocked(from, to, bit_depth, inverse);
+}
+
- for (map<pair<int, bool>, double*>::const_iterator i = _luts.begin(); i != _luts.end(); ++i) {
- delete[] i->second;
+vector<double> const&
+TransferFunction::double_lut_unlocked(double from, double to, int bit_depth, bool inverse) const
+{
+ auto const descriptor = LUTDescriptor{from, to, bit_depth, inverse, 1};
+
+ auto i = _double_luts.find(descriptor);
+ if (i != _double_luts.end()) {
+ return i->second;
}
- _luts.clear ();
+ _double_luts[descriptor] = make_double_lut(from, to, bit_depth, inverse);
+ return _double_luts[descriptor];
}
-double const *
-TransferFunction::lut (int bit_depth, bool inverse) const
+
+vector<int> const&
+TransferFunction::int_lut(double from, double to, int bit_depth, bool inverse, int scale) const
{
boost::mutex::scoped_lock lm (_mutex);
-
- map<pair<int, bool>, double*>::const_iterator i = _luts.find (make_pair (bit_depth, inverse));
- if (i != _luts.end ()) {
+
+ auto const descriptor = LUTDescriptor{from, to, bit_depth, inverse, scale};
+
+ auto i = _int_luts.find(descriptor);
+ if (i != _int_luts.end()) {
return i->second;
}
- _luts[make_pair(bit_depth, inverse)] = make_lut (bit_depth, inverse);
- return _luts[make_pair(bit_depth, inverse)];
+ _int_luts[descriptor] = make_int_lut(from, to, bit_depth, inverse, scale);
+ return _int_luts[descriptor];
}
+
+
+/* Caller must hold lock on _mutex */
+vector<int>
+TransferFunction::make_int_lut(double from, double to, int bit_depth, bool inverse, int scale) const
+{
+ auto source_lut = double_lut_unlocked(from, to, bit_depth, inverse);
+ auto const size = source_lut.size();
+ vector<int> lut(size);
+ for (size_t i = 0; i < size; ++i) {
+ lut[i] = lrint(source_lut[i] * scale);
+ }
+
+ return lut;
+}
+
+
+bool
+TransferFunction::LUTDescriptor::operator==(TransferFunction::LUTDescriptor const& other) const
+{
+ return from == other.from && to == other.to && bit_depth == other.bit_depth && inverse == other.inverse && scale == other.scale;
+}
+
+
+std::size_t
+TransferFunction::LUTDescriptorHasher::operator()(TransferFunction::LUTDescriptor const& desc) const
+{
+ return std::hash<double>()(desc.from) ^
+ std::hash<double>()(desc.to) ^
+ std::hash<int>()(desc.bit_depth) ^
+ std::hash<bool>()(desc.inverse) ^
+ std::hash<int>()(desc.scale);
+}
+