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.
36 #include "openjpeg_image.h"
37 #include "colour_conversion.h"
38 #include "stream_operators.h"
39 #include <boost/bind.hpp>
40 #include <boost/random.hpp>
41 #include <boost/scoped_array.hpp>
42 #include <boost/test/unit_test.hpp>
47 using std::make_shared;
49 using std::shared_ptr;
51 using boost::optional;
52 using boost::scoped_array;
57 rgb_xyz_test_case (std::function<void (uint16_t*)> write_pixel)
60 dcp::Size const size (640, 480);
62 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
63 for (int y = 0; y < size.height; ++y) {
64 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
65 for (int x = 0; x < size.width; ++x) {
71 auto xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz());
73 for (int y = 0; y < size.height; ++y) {
74 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
75 for (int x = 0; x < size.width; ++x) {
77 double cr = *p++ / 65535.0;
78 double cg = *p++ / 65535.0;
79 double cb = *p++ / 65535.0;
86 cr = pow ((cr + 0.055) / 1.055, 2.4);
92 cg = pow ((cg + 0.055) / 1.055, 2.4);
98 cb = pow ((cb + 0.055) / 1.055, 2.4);
103 double cx = cr * 0.4124564 + cg * 0.3575761 + cb * 0.1804375;
104 double cy = cr * 0.2126729 + cg * 0.7151522 + cb * 0.0721750;
105 double cz = cr * 0.0193339 + cg * 0.1191920 + cb * 0.9503041;
115 cx = pow (cx, 1 / 2.6);
116 cy = pow (cy, 1 / 2.6);
117 cz = pow (cz, 1 / 2.6);
119 BOOST_REQUIRE_CLOSE (cx * 4095, xyz->data(0)[y * size.width + x], 1);
120 BOOST_REQUIRE_CLOSE (cy * 4095, xyz->data(1)[y * size.width + x], 1);
121 BOOST_REQUIRE_CLOSE (cz * 4095, xyz->data(2)[y * size.width + x], 1);
127 /** Convert a test image from sRGB to XYZ and check that the transforms are right */
128 BOOST_AUTO_TEST_CASE (rgb_xyz_test)
132 rgb_xyz_test_case ([&counter](uint16_t* p) {
133 p[0] = p[1] = p[2] = (counter << 4);
135 if (counter >= 4096) {
141 boost::random::mt19937 rng(1);
142 boost::random::uniform_int_distribution<> dist(0, 4095);
144 rgb_xyz_test_case ([&rng, &dist](uint16_t* p) {
145 p[0] = dist(rng) << 4;
146 p[1] = dist(rng) << 4;
147 p[2] = dist(rng) << 4;
152 static list<string> notes;
155 note_handler (dcp::NoteType n, string s)
157 BOOST_REQUIRE_EQUAL (n, dcp::NoteType::NOTE);
161 /** Check that xyz_to_rgb clamps XYZ values correctly */
162 BOOST_AUTO_TEST_CASE (xyz_rgb_range_test)
164 auto xyz = make_shared<dcp::OpenJPEGImage>(dcp::Size(2, 2));
166 xyz->data(0)[0] = -4;
167 xyz->data(0)[1] = 6901;
169 xyz->data(0)[3] = 4095;
170 xyz->data(1)[0] = -4;
171 xyz->data(1)[1] = 6901;
173 xyz->data(1)[3] = 4095;
174 xyz->data(2)[0] = -4;
175 xyz->data(2)[1] = 6901;
177 xyz->data(2)[3] = 4095;
179 scoped_array<uint8_t> rgb (new uint8_t[2 * 2 * 6]);
183 xyz, dcp::ColourConversion::srgb_to_xyz (), rgb.get(), 2 * 6, boost::optional<dcp::NoteHandler> (boost::bind (¬e_handler, _1, _2))
186 /* The 6 out-of-range samples should have been noted */
187 BOOST_REQUIRE_EQUAL (notes.size(), 6U);
188 auto i = notes.begin ();
189 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
190 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
191 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
192 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
193 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
194 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
196 /* And those samples should have been clamped, so check that they give the same result
197 as inputs at the extremes (0 and 4095).
200 auto buffer = reinterpret_cast<uint16_t*> (rgb.get ());
201 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 0], buffer[2 * 3 + 1]);
202 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 1], buffer[2 * 3 + 1]);
203 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 2], buffer[2 * 3 + 2]);
205 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 0], buffer[3 * 3 + 0]);
206 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 1], buffer[3 * 3 + 1]);
207 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 2], buffer[3 * 3 + 2]);
210 /** Convert an image from RGB to XYZ and back again */
211 BOOST_AUTO_TEST_CASE (rgb_xyz_round_trip_test)
214 dcp::Size const size (640, 480);
216 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
217 for (int y = 0; y < size.height; ++y) {
218 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
219 for (int x = 0; x < size.width; ++x) {
220 /* Write a 12-bit random number for each component */
221 for (int c = 0; c < 3; ++c) {
222 *p = (rand () & 0xfff) << 4;
228 shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
229 scoped_array<uint8_t> back (new uint8_t[size.width * size.height * 6]);
230 dcp::xyz_to_rgb (xyz, dcp::ColourConversion::srgb_to_xyz (), back.get(), size.width * 6);
233 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get ());
234 uint16_t* q = reinterpret_cast<uint16_t*> (back.get ());
235 for (int i = 0; i < (size.width * size.height); ++i) {
236 /* XXX: doesn't quite work */
237 // BOOST_REQUIRE_EQUAL (*p++, *q++);