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 "openjpeg_image.h"
36 #include "colour_conversion.h"
37 #include "stream_operators.h"
38 #include <boost/test/unit_test.hpp>
39 #include <boost/bind.hpp>
40 #include <boost/scoped_array.hpp>
46 using std::shared_ptr;
47 using std::make_shared;
48 using boost::optional;
49 using boost::scoped_array;
51 /** Convert a test image from sRGB to XYZ and check that the transforms are right */
52 BOOST_AUTO_TEST_CASE (rgb_xyz_test)
55 dcp::Size const size (640, 480);
57 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
58 for (int y = 0; y < size.height; ++y) {
59 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
60 for (int x = 0; x < size.width; ++x) {
61 /* Write a 12-bit random number for each component */
62 for (int c = 0; c < 3; ++c) {
63 *p = (rand () & 0xfff) << 4;
69 auto xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz());
71 for (int y = 0; y < size.height; ++y) {
72 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
73 for (int x = 0; x < size.width; ++x) {
75 double cr = *p++ / 65535.0;
76 double cg = *p++ / 65535.0;
77 double cb = *p++ / 65535.0;
84 cr = pow ((cr + 0.055) / 1.055, 2.4);
90 cg = pow ((cg + 0.055) / 1.055, 2.4);
96 cb = pow ((cb + 0.055) / 1.055, 2.4);
101 double cx = cr * 0.4124564 + cg * 0.3575761 + cb * 0.1804375;
102 double cy = cr * 0.2126729 + cg * 0.7151522 + cb * 0.0721750;
103 double cz = cr * 0.0193339 + cg * 0.1191920 + cb * 0.9503041;
113 cx = pow (cx, 1 / 2.6);
114 cy = pow (cy, 1 / 2.6);
115 cz = pow (cz, 1 / 2.6);
117 BOOST_REQUIRE_CLOSE (cx * 4095, xyz->data(0)[y * size.width + x], 1);
118 BOOST_REQUIRE_CLOSE (cy * 4095, xyz->data(1)[y * size.width + x], 1);
119 BOOST_REQUIRE_CLOSE (cz * 4095, xyz->data(2)[y * size.width + x], 1);
124 static list<string> notes;
127 note_handler (dcp::NoteType n, string s)
129 BOOST_REQUIRE_EQUAL (n, dcp::NoteType::NOTE);
133 /** Check that xyz_to_rgb clamps XYZ values correctly */
134 BOOST_AUTO_TEST_CASE (xyz_rgb_range_test)
136 auto xyz = make_shared<dcp::OpenJPEGImage>(dcp::Size(2, 2));
138 xyz->data(0)[0] = -4;
139 xyz->data(0)[1] = 6901;
141 xyz->data(0)[3] = 4095;
142 xyz->data(1)[0] = -4;
143 xyz->data(1)[1] = 6901;
145 xyz->data(1)[3] = 4095;
146 xyz->data(2)[0] = -4;
147 xyz->data(2)[1] = 6901;
149 xyz->data(2)[3] = 4095;
151 scoped_array<uint8_t> rgb (new uint8_t[2 * 2 * 6]);
155 xyz, dcp::ColourConversion::srgb_to_xyz (), rgb.get(), 2 * 6, boost::optional<dcp::NoteHandler> (boost::bind (¬e_handler, _1, _2))
158 /* The 6 out-of-range samples should have been noted */
159 BOOST_REQUIRE_EQUAL (notes.size(), 6);
160 auto i = notes.begin ();
161 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
162 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
163 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
164 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
165 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
166 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
168 /* And those samples should have been clamped, so check that they give the same result
169 as inputs at the extremes (0 and 4095).
172 auto buffer = reinterpret_cast<uint16_t*> (rgb.get ());
173 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 0], buffer[2 * 3 + 1]);
174 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 1], buffer[2 * 3 + 1]);
175 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 2], buffer[2 * 3 + 2]);
177 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 0], buffer[3 * 3 + 0]);
178 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 1], buffer[3 * 3 + 1]);
179 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 2], buffer[3 * 3 + 2]);
182 /** Convert an image from RGB to XYZ and back again */
183 BOOST_AUTO_TEST_CASE (rgb_xyz_round_trip_test)
186 dcp::Size const size (640, 480);
188 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
189 for (int y = 0; y < size.height; ++y) {
190 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
191 for (int x = 0; x < size.width; ++x) {
192 /* Write a 12-bit random number for each component */
193 for (int c = 0; c < 3; ++c) {
194 *p = (rand () & 0xfff) << 4;
200 shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
201 scoped_array<uint8_t> back (new uint8_t[size.width * size.height * 6]);
202 dcp::xyz_to_rgb (xyz, dcp::ColourConversion::srgb_to_xyz (), back.get(), size.width * 6);
205 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get ());
206 uint16_t* q = reinterpret_cast<uint16_t*> (back.get ());
207 for (int i = 0; i < (size.width * size.height); ++i) {
208 /* XXX: doesn't quite work */
209 // BOOST_REQUIRE_EQUAL (*p++, *q++);