2 Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
4 This file is part of libdcp.
6 libdcp is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 libdcp is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with libdcp. If not, see <http://www.gnu.org/licenses/>.
19 In addition, as a special exception, the copyright holders give
20 permission to link the code of portions of this program with the
21 OpenSSL library under certain conditions as described in each
22 individual source file, and distribute linked combinations
25 You must obey the GNU General Public License in all respects
26 for all of the code used other than OpenSSL. If you modify
27 file(s) with this exception, you may extend this exception to your
28 version of the file(s), but you are not obligated to do so. If you
29 do not wish to do so, delete this exception statement from your
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31 files in the program, then also delete it here.
34 /** @file src/colour_conversion.h
35 * @brief ColourConversion class.
38 #ifndef DCP_COLOUR_CONVERSION_H
39 #define DCP_COLOUR_CONVERSION_H
41 #include "chromaticity.h"
42 #include <boost/shared_ptr.hpp>
43 #include <boost/numeric/ublas/matrix.hpp>
44 #include <boost/optional.hpp>
48 class TransferFunction;
56 /** @class ColourConversion
57 * @brief A representation of all the parameters involved the colourspace conversion
58 * of a YUV image to XYZ (via RGB).
60 class ColourConversion
64 : _yuv_to_rgb (YUV_TO_RGB_REC601)
68 boost::shared_ptr<const TransferFunction> in,
74 boost::optional<Chromaticity> adjusted_white,
75 boost::shared_ptr<const TransferFunction> out
78 boost::shared_ptr<const TransferFunction> in () const {
82 YUVToRGB yuv_to_rgb () const {
86 Chromaticity red () const {
90 Chromaticity green () const {
94 Chromaticity blue () const {
98 Chromaticity white () const {
102 boost::optional<Chromaticity> adjusted_white () const {
103 return _adjusted_white;
106 boost::shared_ptr<const TransferFunction> out () const {
110 void set_in (boost::shared_ptr<const TransferFunction> f) {
114 void set_yuv_to_rgb (YUVToRGB y) {
118 void set_red (Chromaticity red) {
122 void set_green (Chromaticity green) {
126 void set_blue (Chromaticity blue) {
130 void set_white (Chromaticity white) {
134 void set_adjusted_white (Chromaticity adjusted_white) {
135 _adjusted_white = adjusted_white;
138 void unset_adjusted_white () {
139 _adjusted_white = boost::optional<Chromaticity> ();
142 void set_out (boost::shared_ptr<const TransferFunction> f) {
146 bool about_equal (ColourConversion const & other, float epsilon) const;
148 boost::numeric::ublas::matrix<double> rgb_to_xyz () const;
149 boost::numeric::ublas::matrix<double> xyz_to_rgb () const;
150 boost::numeric::ublas::matrix<double> bradford () const;
152 static ColourConversion const & srgb_to_xyz ();
153 static ColourConversion const & rec601_to_xyz ();
154 static ColourConversion const & rec709_to_xyz ();
155 static ColourConversion const & p3_to_xyz ();
156 static ColourConversion const & rec1886_to_xyz ();
157 static ColourConversion const & rec2020_to_xyz ();
158 static ColourConversion const & s_gamut3_to_xyz ();
161 /** Input transfer function (probably a gamma function, or something similar) */
162 boost::shared_ptr<const TransferFunction> _in;
163 /** Conversion to use from YUV to RGB */
164 YUVToRGB _yuv_to_rgb;
169 /** White point that we are adjusting to using a Bradford matrix */
170 boost::optional<Chromaticity> _adjusted_white;
171 /** Output transfer function (probably an inverse gamma function, or something similar) */
172 boost::shared_ptr<const TransferFunction> _out;