2 Copyright (C) 2013-2021 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
30 version. If you delete this exception statement from all source
31 files in the program, then also delete it here.
35 #include "colour_conversion.h"
36 #include "compose.hpp"
37 #include "dcp_assert.h"
38 #include "openjpeg_image.h"
40 #include "transfer_function.h"
45 using std::make_shared;
48 using std::shared_ptr;
49 using boost::optional;
53 static auto constexpr DCI_COEFFICIENT = 48.0 / 52.37;
58 std::shared_ptr<const OpenJPEGImage> xyz_image,
59 ColourConversion const & conversion,
64 int const max_colour = pow (2, 16) - 1;
74 int* xyz_x = xyz_image->data (0);
75 int* xyz_y = xyz_image->data (1);
76 int* xyz_z = xyz_image->data (2);
78 double const * lut_in = conversion.out()->lut (12, false);
79 double const * lut_out = conversion.in()->lut (16, true);
80 boost::numeric::ublas::matrix<double> const matrix = conversion.xyz_to_rgb ();
82 double fast_matrix[9] = {
83 matrix (0, 0), matrix (0, 1), matrix (0, 2),
84 matrix (1, 0), matrix (1, 1), matrix (1, 2),
85 matrix (2, 0), matrix (2, 1), matrix (2, 2)
88 int const height = xyz_image->size().height;
89 int const width = xyz_image->size().width;
91 for (int y = 0; y < height; ++y) {
92 uint8_t* argb_line = argb;
93 for (int x = 0; x < width; ++x) {
95 DCP_ASSERT (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_y < 4096 && *xyz_z < 4096);
98 s.x = lut_in[*xyz_x++];
99 s.y = lut_in[*xyz_y++];
100 s.z = lut_in[*xyz_z++];
103 s.x /= DCI_COEFFICIENT;
104 s.y /= DCI_COEFFICIENT;
105 s.z /= DCI_COEFFICIENT;
108 d.r = ((s.x * fast_matrix[0]) + (s.y * fast_matrix[1]) + (s.z * fast_matrix[2]));
109 d.g = ((s.x * fast_matrix[3]) + (s.y * fast_matrix[4]) + (s.z * fast_matrix[5]));
110 d.b = ((s.x * fast_matrix[6]) + (s.y * fast_matrix[7]) + (s.z * fast_matrix[8]));
112 d.r = min (d.r, 1.0);
113 d.r = max (d.r, 0.0);
115 d.g = min (d.g, 1.0);
116 d.g = max (d.g, 0.0);
118 d.b = min (d.b, 1.0);
119 d.b = max (d.b, 0.0);
122 *argb_line++ = lut_out[lrint(d.b * max_colour)] * 0xff;
123 *argb_line++ = lut_out[lrint(d.g * max_colour)] * 0xff;
124 *argb_line++ = lut_out[lrint(d.r * max_colour)] * 0xff;
135 shared_ptr<const OpenJPEGImage> xyz_image,
136 ColourConversion const & conversion,
139 optional<NoteHandler> note
150 /* These should be 12-bit values from 0-4095 */
151 int* xyz_x = xyz_image->data (0);
152 int* xyz_y = xyz_image->data (1);
153 int* xyz_z = xyz_image->data (2);
155 double const * lut_in = conversion.out()->lut (12, false);
156 double const * lut_out = conversion.in()->lut (16, true);
157 boost::numeric::ublas::matrix<double> const matrix = conversion.xyz_to_rgb ();
159 double fast_matrix[9] = {
160 matrix (0, 0), matrix (0, 1), matrix (0, 2),
161 matrix (1, 0), matrix (1, 1), matrix (1, 2),
162 matrix (2, 0), matrix (2, 1), matrix (2, 2)
165 int const height = xyz_image->size().height;
166 int const width = xyz_image->size().width;
168 for (int y = 0; y < height; ++y) {
169 uint16_t* rgb_line = reinterpret_cast<uint16_t*> (rgb + y * stride);
170 for (int x = 0; x < width; ++x) {
176 if (cx < 0 || cx > 4095) {
178 note.get()(NoteType::NOTE, String::compose("XYZ value %1 out of range", cx));
180 cx = max (min (cx, 4095), 0);
183 if (cy < 0 || cy > 4095) {
185 note.get()(NoteType::NOTE, String::compose("XYZ value %1 out of range", cy));
187 cy = max (min (cy, 4095), 0);
190 if (cz < 0 || cz > 4095) {
192 note.get()(NoteType::NOTE, String::compose("XYZ value %1 out of range", cz));
194 cz = max (min (cz, 4095), 0);
203 s.x /= DCI_COEFFICIENT;
204 s.y /= DCI_COEFFICIENT;
205 s.z /= DCI_COEFFICIENT;
208 d.r = ((s.x * fast_matrix[0]) + (s.y * fast_matrix[1]) + (s.z * fast_matrix[2]));
209 d.g = ((s.x * fast_matrix[3]) + (s.y * fast_matrix[4]) + (s.z * fast_matrix[5]));
210 d.b = ((s.x * fast_matrix[6]) + (s.y * fast_matrix[7]) + (s.z * fast_matrix[8]));
212 d.r = min (d.r, 1.0);
213 d.r = max (d.r, 0.0);
215 d.g = min (d.g, 1.0);
216 d.g = max (d.g, 0.0);
218 d.b = min (d.b, 1.0);
219 d.b = max (d.b, 0.0);
221 *rgb_line++ = lrint(lut_out[lrint(d.r * 65535)] * 65535);
222 *rgb_line++ = lrint(lut_out[lrint(d.g * 65535)] * 65535);
223 *rgb_line++ = lrint(lut_out[lrint(d.b * 65535)] * 65535);
229 dcp::combined_rgb_to_xyz (ColourConversion const & conversion, double* matrix)
231 boost::numeric::ublas::matrix<double> const rgb_to_xyz = conversion.rgb_to_xyz ();
232 boost::numeric::ublas::matrix<double> const bradford = conversion.bradford ();
234 matrix[0] = (bradford (0, 0) * rgb_to_xyz (0, 0) + bradford (0, 1) * rgb_to_xyz (1, 0) + bradford (0, 2) * rgb_to_xyz (2, 0))
235 * DCI_COEFFICIENT * 65535;
236 matrix[1] = (bradford (0, 0) * rgb_to_xyz (0, 1) + bradford (0, 1) * rgb_to_xyz (1, 1) + bradford (0, 2) * rgb_to_xyz (2, 1))
237 * DCI_COEFFICIENT * 65535;
238 matrix[2] = (bradford (0, 0) * rgb_to_xyz (0, 2) + bradford (0, 1) * rgb_to_xyz (1, 2) + bradford (0, 2) * rgb_to_xyz (2, 2))
239 * DCI_COEFFICIENT * 65535;
240 matrix[3] = (bradford (1, 0) * rgb_to_xyz (0, 0) + bradford (1, 1) * rgb_to_xyz (1, 0) + bradford (1, 2) * rgb_to_xyz (2, 0))
241 * DCI_COEFFICIENT * 65535;
242 matrix[4] = (bradford (1, 0) * rgb_to_xyz (0, 1) + bradford (1, 1) * rgb_to_xyz (1, 1) + bradford (1, 2) * rgb_to_xyz (2, 1))
243 * DCI_COEFFICIENT * 65535;
244 matrix[5] = (bradford (1, 0) * rgb_to_xyz (0, 2) + bradford (1, 1) * rgb_to_xyz (1, 2) + bradford (1, 2) * rgb_to_xyz (2, 2))
245 * DCI_COEFFICIENT * 65535;
246 matrix[6] = (bradford (2, 0) * rgb_to_xyz (0, 0) + bradford (2, 1) * rgb_to_xyz (1, 0) + bradford (2, 2) * rgb_to_xyz (2, 0))
247 * DCI_COEFFICIENT * 65535;
248 matrix[7] = (bradford (2, 0) * rgb_to_xyz (0, 1) + bradford (2, 1) * rgb_to_xyz (1, 1) + bradford (2, 2) * rgb_to_xyz (2, 1))
249 * DCI_COEFFICIENT * 65535;
250 matrix[8] = (bradford (2, 0) * rgb_to_xyz (0, 2) + bradford (2, 1) * rgb_to_xyz (1, 2) + bradford (2, 2) * rgb_to_xyz (2, 2))
251 * DCI_COEFFICIENT * 65535;
255 shared_ptr<dcp::OpenJPEGImage>
260 ColourConversion const & conversion,
261 optional<NoteHandler> note
264 auto xyz = make_shared<OpenJPEGImage>(size);
274 auto const * lut_in = conversion.in()->lut (12, false);
275 auto const * lut_out = conversion.out()->lut (16, true);
277 /* This is is the product of the RGB to XYZ matrix, the Bradford transform and the DCI companding */
278 double fast_matrix[9];
279 combined_rgb_to_xyz (conversion, fast_matrix);
282 int* xyz_x = xyz->data (0);
283 int* xyz_y = xyz->data (1);
284 int* xyz_z = xyz->data (2);
285 for (int y = 0; y < size.height; ++y) {
286 auto p = reinterpret_cast<uint16_t const *> (rgb + y * stride);
287 for (int x = 0; x < size.width; ++x) {
289 /* In gamma LUT (converting 16-bit to 12-bit) */
290 s.r = lut_in[*p++ >> 4];
291 s.g = lut_in[*p++ >> 4];
292 s.b = lut_in[*p++ >> 4];
294 /* RGB to XYZ, Bradford transform and DCI companding */
295 d.x = s.r * fast_matrix[0] + s.g * fast_matrix[1] + s.b * fast_matrix[2];
296 d.y = s.r * fast_matrix[3] + s.g * fast_matrix[4] + s.b * fast_matrix[5];
297 d.z = s.r * fast_matrix[6] + s.g * fast_matrix[7] + s.b * fast_matrix[8];
301 if (d.x < 0 || d.y < 0 || d.z < 0 || d.x > 65535 || d.y > 65535 || d.z > 65535) {
305 d.x = max (0.0, d.x);
306 d.y = max (0.0, d.y);
307 d.z = max (0.0, d.z);
308 d.x = min (65535.0, d.x);
309 d.y = min (65535.0, d.y);
310 d.z = min (65535.0, d.z);
313 *xyz_x++ = lrint (lut_out[lrint(d.x)] * 4095);
314 *xyz_y++ = lrint (lut_out[lrint(d.y)] * 4095);
315 *xyz_z++ = lrint (lut_out[lrint(d.z)] * 4095);
319 if (clamped && note) {
320 note.get()(NoteType::NOTE, String::compose("%1 XYZ value(s) clamped", clamped));