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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"
#include <cmath>
using std::pow;
using std::map;
using std::pair;
using std::make_pair;
using boost::shared_ptr;
using namespace dcp;
TransferFunction::~TransferFunction ()
{
boost::mutex::scoped_lock lm (_mutex);
for (map<pair<int, bool>, double*>::const_iterator i = _luts.begin(); i != _luts.end(); ++i) {
delete[] i->second;
}
_luts.clear ();
}
double const *
TransferFunction::lut (int bit_depth, bool inverse) 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 ()) {
return i->second;
}
_luts[make_pair(bit_depth, inverse)] = make_lut (bit_depth, inverse);
return _luts[make_pair(bit_depth, inverse)];
}
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