2 Copyright (C) 2014-2021 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 "openjpeg_image.h"
37 #include "piecewise_lut.h"
39 #include "stream_operators.h"
40 #include <boost/bind/bind.hpp>
41 #include <boost/random.hpp>
42 #include <boost/scoped_array.hpp>
43 #include <boost/test/unit_test.hpp>
48 using std::make_shared;
50 using std::shared_ptr;
52 using boost::optional;
53 using boost::scoped_array;
54 #if BOOST_VERSION >= 106100
55 using namespace boost::placeholders;
61 rgb_xyz_test_case (std::function<void (uint16_t*)> write_pixel)
64 dcp::Size const size (640, 480);
66 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
67 for (int y = 0; y < size.height; ++y) {
68 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
69 for (int x = 0; x < size.width; ++x) {
75 auto xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz());
77 for (int y = 0; y < size.height; ++y) {
78 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
79 for (int x = 0; x < size.width; ++x) {
81 double cr = *p++ / 65535.0;
82 double cg = *p++ / 65535.0;
83 double cb = *p++ / 65535.0;
90 cr = pow ((cr + 0.055) / 1.055, 2.4);
96 cg = pow ((cg + 0.055) / 1.055, 2.4);
102 cb = pow ((cb + 0.055) / 1.055, 2.4);
107 double cx = cr * 0.4124564 + cg * 0.3575761 + cb * 0.1804375;
108 double cy = cr * 0.2126729 + cg * 0.7151522 + cb * 0.0721750;
109 double cz = cr * 0.0193339 + cg * 0.1191920 + cb * 0.9503041;
119 cx = pow (cx, 1 / 2.6);
120 cy = pow (cy, 1 / 2.6);
121 cz = pow (cz, 1 / 2.6);
123 BOOST_REQUIRE_CLOSE (cx * 4095, xyz->data(0)[y * size.width + x], 1);
124 BOOST_REQUIRE_CLOSE (cy * 4095, xyz->data(1)[y * size.width + x], 1);
125 BOOST_REQUIRE_CLOSE (cz * 4095, xyz->data(2)[y * size.width + x], 1);
131 /** Convert a test image from sRGB to XYZ and check that the transforms are right */
132 BOOST_AUTO_TEST_CASE (rgb_xyz_test)
136 rgb_xyz_test_case ([&counter](uint16_t* p) {
137 p[0] = p[1] = p[2] = (counter << 4);
139 if (counter >= 4096) {
145 boost::random::mt19937 rng(1);
146 boost::random::uniform_int_distribution<> dist(0, 4095);
148 rgb_xyz_test_case ([&rng, &dist](uint16_t* p) {
149 p[0] = dist(rng) << 4;
150 p[1] = dist(rng) << 4;
151 p[2] = dist(rng) << 4;
156 /** Check the piecewise LUT that is used for inverse gamma calculation */
157 BOOST_AUTO_TEST_CASE (rgb_xyz_lut_test)
159 auto conversion = dcp::ColourConversion::rec709_to_xyz();
160 auto lut = dcp::make_inverse_gamma_lut(conversion.out());
162 for (double x = 0; x < 1; x += 0.000001) {
163 BOOST_CHECK(std::abs(lrint(lut.lookup(x) * 4095) - lrint(pow(x, 1 / 2.6) * 4095)) < 2);
168 static list<string> notes;
171 note_handler (dcp::NoteType n, string s)
173 BOOST_REQUIRE_EQUAL (n, dcp::NoteType::NOTE);
177 /** Check that xyz_to_rgb clamps XYZ values correctly */
178 BOOST_AUTO_TEST_CASE (xyz_rgb_range_test)
180 auto xyz = make_shared<dcp::OpenJPEGImage>(dcp::Size(2, 2));
182 xyz->data(0)[0] = -4;
183 xyz->data(0)[1] = 6901;
185 xyz->data(0)[3] = 4095;
186 xyz->data(1)[0] = -4;
187 xyz->data(1)[1] = 6901;
189 xyz->data(1)[3] = 4095;
190 xyz->data(2)[0] = -4;
191 xyz->data(2)[1] = 6901;
193 xyz->data(2)[3] = 4095;
195 scoped_array<uint8_t> rgb (new uint8_t[2 * 2 * 6]);
199 xyz, dcp::ColourConversion::srgb_to_xyz (), rgb.get(), 2 * 6, boost::optional<dcp::NoteHandler> (boost::bind (¬e_handler, _1, _2))
202 /* The 6 out-of-range samples should have been noted */
203 BOOST_REQUIRE_EQUAL (notes.size(), 6U);
204 auto i = notes.begin ();
205 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
206 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
207 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
208 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
209 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
210 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
212 /* And those samples should have been clamped, so check that they give the same result
213 as inputs at the extremes (0 and 4095).
216 auto buffer = reinterpret_cast<uint16_t*> (rgb.get ());
217 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 0], buffer[2 * 3 + 1]);
218 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 1], buffer[2 * 3 + 1]);
219 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 2], buffer[2 * 3 + 2]);
221 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 0], buffer[3 * 3 + 0]);
222 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 1], buffer[3 * 3 + 1]);
223 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 2], buffer[3 * 3 + 2]);
226 /** Convert an image from RGB to XYZ and back again */
227 BOOST_AUTO_TEST_CASE (rgb_xyz_round_trip_test)
230 dcp::Size const size (640, 480);
232 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
233 for (int y = 0; y < size.height; ++y) {
234 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
235 for (int x = 0; x < size.width; ++x) {
236 /* Write a 12-bit random number for each component */
237 for (int c = 0; c < 3; ++c) {
238 *p = (rand () & 0xfff) << 4;
244 shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
245 scoped_array<uint8_t> back (new uint8_t[size.width * size.height * 6]);
246 dcp::xyz_to_rgb (xyz, dcp::ColourConversion::srgb_to_xyz (), back.get(), size.width * 6);
249 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get ());
250 uint16_t* q = reinterpret_cast<uint16_t*> (back.get ());
251 for (int i = 0; i < (size.width * size.height); ++i) {
252 /* XXX: doesn't quite work */
253 // BOOST_REQUIRE_EQUAL (*p++, *q++);