2 Copyright (C) 2013-2015 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
30 version. If you delete this exception statement from all source
31 files in the program, then also delete it here.
35 #include "openjpeg_image.h"
36 #include "colour_matrix.h"
37 #include "colour_conversion.h"
38 #include "transfer_function.h"
39 #include "dcp_assert.h"
40 #include "compose.hpp"
46 using boost::shared_ptr;
47 using boost::optional;
50 #define DCI_COEFFICIENT (48.0 / 52.37)
52 /** Convert an XYZ image to RGBA.
53 * @param xyz_image Image in XYZ.
54 * @param conversion Colour conversion to use.
55 * @param argb Buffer to fill with RGBA data. The format of the data is:
58 * Byte /- 0 -------|- 1 --------|- 2 --------|- 3 --------|- 4 --------|- 5 --------| ...
59 * |(0, 0) Blue|(0, 0)Green |(0, 0) Red |(0, 0) Alpha|(0, 1) Blue |(0, 1) Green| ...
62 * So that the first byte is the blue component of the pixel at x=0, y=0, the second
63 * is the green component, and so on.
65 * Lines are packed so that the second row directly follows the first.
69 boost::shared_ptr<const OpenJPEGImage> xyz_image,
70 ColourConversion const & conversion,
74 int const max_colour = pow (2, 16) - 1;
84 int* xyz_x = xyz_image->data (0);
85 int* xyz_y = xyz_image->data (1);
86 int* xyz_z = xyz_image->data (2);
88 double const * lut_in = conversion.out()->lut (12, false);
89 double const * lut_out = conversion.in()->lut (16, true);
90 boost::numeric::ublas::matrix<double> const matrix = conversion.xyz_to_rgb ();
92 double fast_matrix[9] = {
93 matrix (0, 0), matrix (0, 1), matrix (0, 2),
94 matrix (1, 0), matrix (1, 1), matrix (1, 2),
95 matrix (2, 0), matrix (2, 1), matrix (2, 2)
98 int const height = xyz_image->size().height;
99 int const width = xyz_image->size().width;
101 for (int y = 0; y < height; ++y) {
102 uint8_t* argb_line = argb;
103 for (int x = 0; x < width; ++x) {
105 DCP_ASSERT (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_y < 4096 && *xyz_z < 4096);
108 s.x = lut_in[*xyz_x++];
109 s.y = lut_in[*xyz_y++];
110 s.z = lut_in[*xyz_z++];
113 s.x /= DCI_COEFFICIENT;
114 s.y /= DCI_COEFFICIENT;
115 s.z /= DCI_COEFFICIENT;
118 d.r = ((s.x * fast_matrix[0]) + (s.y * fast_matrix[1]) + (s.z * fast_matrix[2]));
119 d.g = ((s.x * fast_matrix[3]) + (s.y * fast_matrix[4]) + (s.z * fast_matrix[5]));
120 d.b = ((s.x * fast_matrix[6]) + (s.y * fast_matrix[7]) + (s.z * fast_matrix[8]));
122 d.r = min (d.r, 1.0);
123 d.r = max (d.r, 0.0);
125 d.g = min (d.g, 1.0);
126 d.g = max (d.g, 0.0);
128 d.b = min (d.b, 1.0);
129 d.b = max (d.b, 0.0);
132 *argb_line++ = lut_out[lrint(d.b * max_colour)] * 0xff;
133 *argb_line++ = lut_out[lrint(d.g * max_colour)] * 0xff;
134 *argb_line++ = lut_out[lrint(d.r * max_colour)] * 0xff;
138 /* 4 bytes per pixel */
143 /** Convert an XYZ image to 48bpp RGB.
144 * @param xyz_image Frame in XYZ.
145 * @param conversion Colour conversion to use.
146 * @param rgb Buffer to fill with RGB data. Format is packed RGB
147 * 16:16:16, 48bpp, 16R, 16G, 16B, with the 2-byte value for each
148 * R/G/B component stored as little-endian; i.e. AV_PIX_FMT_RGB48LE.
149 * @param stride Stride for RGB data in bytes.
150 * @param note Optional handler for any notes that may be made during the conversion (e.g. when clamping occurs).
154 shared_ptr<const OpenJPEGImage> xyz_image,
155 ColourConversion const & conversion,
158 optional<NoteHandler> note
169 /* These should be 12-bit values from 0-4095 */
170 int* xyz_x = xyz_image->data (0);
171 int* xyz_y = xyz_image->data (1);
172 int* xyz_z = xyz_image->data (2);
174 double const * lut_in = conversion.out()->lut (12, false);
175 double const * lut_out = conversion.in()->lut (16, true);
176 boost::numeric::ublas::matrix<double> const matrix = conversion.xyz_to_rgb ();
178 double fast_matrix[9] = {
179 matrix (0, 0), matrix (0, 1), matrix (0, 2),
180 matrix (1, 0), matrix (1, 1), matrix (1, 2),
181 matrix (2, 0), matrix (2, 1), matrix (2, 2)
184 int const height = xyz_image->size().height;
185 int const width = xyz_image->size().width;
187 for (int y = 0; y < height; ++y) {
188 uint16_t* rgb_line = reinterpret_cast<uint16_t*> (rgb + y * stride);
189 for (int x = 0; x < width; ++x) {
195 if (cx < 0 || cx > 4095) {
197 note.get() (DCP_NOTE, String::compose ("XYZ value %1 out of range", cx));
199 cx = max (min (cx, 4095), 0);
202 if (cy < 0 || cy > 4095) {
204 note.get() (DCP_NOTE, String::compose ("XYZ value %1 out of range", cy));
206 cy = max (min (cy, 4095), 0);
209 if (cz < 0 || cz > 4095) {
211 note.get() (DCP_NOTE, String::compose ("XYZ value %1 out of range", cz));
213 cz = max (min (cz, 4095), 0);
222 s.x /= DCI_COEFFICIENT;
223 s.y /= DCI_COEFFICIENT;
224 s.z /= DCI_COEFFICIENT;
227 d.r = ((s.x * fast_matrix[0]) + (s.y * fast_matrix[1]) + (s.z * fast_matrix[2]));
228 d.g = ((s.x * fast_matrix[3]) + (s.y * fast_matrix[4]) + (s.z * fast_matrix[5]));
229 d.b = ((s.x * fast_matrix[6]) + (s.y * fast_matrix[7]) + (s.z * fast_matrix[8]));
231 d.r = min (d.r, 1.0);
232 d.r = max (d.r, 0.0);
234 d.g = min (d.g, 1.0);
235 d.g = max (d.g, 0.0);
237 d.b = min (d.b, 1.0);
238 d.b = max (d.b, 0.0);
240 *rgb_line++ = lrint(lut_out[lrint(d.r * 65535)] * 65535);
241 *rgb_line++ = lrint(lut_out[lrint(d.g * 65535)] * 65535);
242 *rgb_line++ = lrint(lut_out[lrint(d.b * 65535)] * 65535);
247 /** @param conversion Colour conversion.
248 * @param matrix Filled in with the product of the RGB to XYZ matrix, the Bradford transform and the DCI companding.
251 dcp::combined_rgb_to_xyz (ColourConversion const & conversion, double* matrix)
253 boost::numeric::ublas::matrix<double> const rgb_to_xyz = conversion.rgb_to_xyz ();
254 boost::numeric::ublas::matrix<double> const bradford = conversion.bradford ();
256 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))
257 * DCI_COEFFICIENT * 65535;
258 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))
259 * DCI_COEFFICIENT * 65535;
260 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))
261 * DCI_COEFFICIENT * 65535;
262 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))
263 * DCI_COEFFICIENT * 65535;
264 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))
265 * DCI_COEFFICIENT * 65535;
266 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))
267 * DCI_COEFFICIENT * 65535;
268 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))
269 * DCI_COEFFICIENT * 65535;
270 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))
271 * DCI_COEFFICIENT * 65535;
272 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))
273 * DCI_COEFFICIENT * 65535;
276 /** @param rgb RGB data; packed RGB 16:16:16, 48bpp, 16R, 16G, 16B,
277 * with the 2-byte value for each R/G/B component stored as
278 * little-endian; i.e. AV_PIX_FMT_RGB48LE.
279 * @param size size of RGB image in pixels.
280 * @param size stride of RGB data in pixels.
282 shared_ptr<dcp::OpenJPEGImage>
287 ColourConversion const & conversion,
288 optional<NoteHandler> note
291 shared_ptr<OpenJPEGImage> xyz (new OpenJPEGImage (size));
301 double const * lut_in = conversion.in()->lut (12, false);
302 double const * lut_out = conversion.out()->lut (16, true);
304 /* This is is the product of the RGB to XYZ matrix, the Bradford transform and the DCI companding */
305 double fast_matrix[9];
306 combined_rgb_to_xyz (conversion, fast_matrix);
309 int* xyz_x = xyz->data (0);
310 int* xyz_y = xyz->data (1);
311 int* xyz_z = xyz->data (2);
312 for (int y = 0; y < size.height; ++y) {
313 uint16_t const * p = reinterpret_cast<uint16_t const *> (rgb + y * stride);
314 for (int x = 0; x < size.width; ++x) {
316 /* In gamma LUT (converting 16-bit to 12-bit) */
317 s.r = lut_in[*p++ >> 4];
318 s.g = lut_in[*p++ >> 4];
319 s.b = lut_in[*p++ >> 4];
321 /* RGB to XYZ, Bradford transform and DCI companding */
322 d.x = s.r * fast_matrix[0] + s.g * fast_matrix[1] + s.b * fast_matrix[2];
323 d.y = s.r * fast_matrix[3] + s.g * fast_matrix[4] + s.b * fast_matrix[5];
324 d.z = s.r * fast_matrix[6] + s.g * fast_matrix[7] + s.b * fast_matrix[8];
328 if (d.x < 0 || d.y < 0 || d.z < 0 || d.x > 65535 || d.y > 65535 || d.z > 65535) {
332 d.x = max (0.0, d.x);
333 d.y = max (0.0, d.y);
334 d.z = max (0.0, d.z);
335 d.x = min (65535.0, d.x);
336 d.y = min (65535.0, d.y);
337 d.z = min (65535.0, d.z);
340 *xyz_x++ = lrint (lut_out[lrint(d.x)] * 4095);
341 *xyz_y++ = lrint (lut_out[lrint(d.y)] * 4095);
342 *xyz_z++ = lrint (lut_out[lrint(d.z)] * 4095);
346 if (clamped && note) {
347 note.get() (DCP_NOTE, String::compose ("%1 XYZ value(s) clamped", clamped));
354 /** @param xyz_16 XYZ image data in packed 16:16:16, 48bpp, 16X, 16Y,
355 * 16Z, with the 2-byte value for each X/Y/Z component stored as
358 shared_ptr<dcp::OpenJPEGImage>
359 dcp::xyz_to_xyz (uint8_t const * xyz_16, dcp::Size size, int stride)
361 shared_ptr<OpenJPEGImage> xyz_12 (new OpenJPEGImage (size));
364 for (int y = 0; y < size.height; ++y) {
365 uint16_t const * p = reinterpret_cast<uint16_t const *> (xyz_16 + y * stride);
366 for (int x = 0; x < size.width; ++x) {
367 /* Truncate 16-bit to 12-bit */
368 xyz_12->data(0)[jn] = *p++ >> 4;
369 xyz_12->data(1)[jn] = *p++ >> 4;
370 xyz_12->data(2)[jn] = *p++ >> 4;