Add tentative S-Gamut3/S-Log3 colourspace support.

1 files changed, 63 insertions, 0 deletions

diff --git a/src/identity_transfer_function.cc b/src/identity_transfer_function.cc
new file mode 100644
index 00000000..1edc61da
--- /dev/null
+++ b/src/identity_transfer_function.cc
@@ -0,0 +1,63 @@
+/*
+    Copyright (C) 2016 Carl Hetherington <cth@carlh.net>
+
+    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.
+
+    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 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/identity_transfer_function.cc
+ *  @brief IdentityTransferFunction class.
+ */
+
+#include "identity_transfer_function.h"
+#include <cmath>
+
+using std::pow;
+using boost::shared_ptr;
+using boost::dynamic_pointer_cast;
+using namespace dcp;
+
+double *
+IdentityTransferFunction::make_lut (int bit_depth, bool) const
+{
+	int const bit_length = int(std::pow(2.0f, bit_depth));
+	double* lut = new double[bit_length];
+	for (int i = 0; i < bit_length; ++i) {
+		lut[i] = double(i) / (bit_length - 1);
+	}
+
+	return lut;
+}
+
+bool
+IdentityTransferFunction::about_equal (shared_ptr<const TransferFunction> other, double) const
+{
+	shared_ptr<const IdentityTransferFunction> o = dynamic_pointer_cast<const IdentityTransferFunction> (other);
+	return static_cast<bool>(o);
+}