2 Copyright (C) 2014-2019 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 <boost/test/unit_test.hpp>
38 #include <boost/bind.hpp>
39 #include <boost/scoped_array.hpp>
45 using std::shared_ptr;
46 using std::make_shared;
47 using boost::optional;
48 using boost::scoped_array;
50 /** Convert a test image from sRGB to XYZ and check that the transforms are right */
51 BOOST_AUTO_TEST_CASE (rgb_xyz_test)
54 dcp::Size const size (640, 480);
56 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
57 for (int y = 0; y < size.height; ++y) {
58 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
59 for (int x = 0; x < size.width; ++x) {
60 /* Write a 12-bit random number for each component */
61 for (int c = 0; c < 3; ++c) {
62 *p = (rand () & 0xfff) << 4;
68 auto xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz());
70 for (int y = 0; y < size.height; ++y) {
71 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
72 for (int x = 0; x < size.width; ++x) {
74 double cr = *p++ / 65535.0;
75 double cg = *p++ / 65535.0;
76 double cb = *p++ / 65535.0;
83 cr = pow ((cr + 0.055) / 1.055, 2.4);
89 cg = pow ((cg + 0.055) / 1.055, 2.4);
95 cb = pow ((cb + 0.055) / 1.055, 2.4);
100 double cx = cr * 0.4124564 + cg * 0.3575761 + cb * 0.1804375;
101 double cy = cr * 0.2126729 + cg * 0.7151522 + cb * 0.0721750;
102 double cz = cr * 0.0193339 + cg * 0.1191920 + cb * 0.9503041;
112 cx = pow (cx, 1 / 2.6);
113 cy = pow (cy, 1 / 2.6);
114 cz = pow (cz, 1 / 2.6);
116 BOOST_REQUIRE_CLOSE (cx * 4095, xyz->data(0)[y * size.width + x], 1);
117 BOOST_REQUIRE_CLOSE (cy * 4095, xyz->data(1)[y * size.width + x], 1);
118 BOOST_REQUIRE_CLOSE (cz * 4095, xyz->data(2)[y * size.width + x], 1);
123 static list<string> notes;
126 note_handler (dcp::NoteType n, string s)
128 BOOST_REQUIRE_EQUAL (n, dcp::NoteType::NOTE);
132 /** Check that xyz_to_rgb clamps XYZ values correctly */
133 BOOST_AUTO_TEST_CASE (xyz_rgb_range_test)
135 auto xyz = make_shared<dcp::OpenJPEGImage>(dcp::Size(2, 2));
137 xyz->data(0)[0] = -4;
138 xyz->data(0)[1] = 6901;
140 xyz->data(0)[3] = 4095;
141 xyz->data(1)[0] = -4;
142 xyz->data(1)[1] = 6901;
144 xyz->data(1)[3] = 4095;
145 xyz->data(2)[0] = -4;
146 xyz->data(2)[1] = 6901;
148 xyz->data(2)[3] = 4095;
150 scoped_array<uint8_t> rgb (new uint8_t[2 * 2 * 6]);
154 xyz, dcp::ColourConversion::srgb_to_xyz (), rgb.get(), 2 * 6, boost::optional<dcp::NoteHandler> (boost::bind (¬e_handler, _1, _2))
157 /* The 6 out-of-range samples should have been noted */
158 BOOST_REQUIRE_EQUAL (notes.size(), 6);
159 auto i = notes.begin ();
160 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
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 6901 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");
167 /* And those samples should have been clamped, so check that they give the same result
168 as inputs at the extremes (0 and 4095).
171 auto buffer = reinterpret_cast<uint16_t*> (rgb.get ());
172 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 0], buffer[2 * 3 + 1]);
173 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 1], buffer[2 * 3 + 1]);
174 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 2], buffer[2 * 3 + 2]);
176 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 0], buffer[3 * 3 + 0]);
177 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 1], buffer[3 * 3 + 1]);
178 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 2], buffer[3 * 3 + 2]);
181 /** Convert an image from RGB to XYZ and back again */
182 BOOST_AUTO_TEST_CASE (rgb_xyz_round_trip_test)
185 dcp::Size const size (640, 480);
187 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
188 for (int y = 0; y < size.height; ++y) {
189 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
190 for (int x = 0; x < size.width; ++x) {
191 /* Write a 12-bit random number for each component */
192 for (int c = 0; c < 3; ++c) {
193 *p = (rand () & 0xfff) << 4;
199 shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
200 scoped_array<uint8_t> back (new uint8_t[size.width * size.height * 6]);
201 dcp::xyz_to_rgb (xyz, dcp::ColourConversion::srgb_to_xyz (), back.get(), size.width * 6);
204 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get ());
205 uint16_t* q = reinterpret_cast<uint16_t*> (back.get ());
206 for (int i = 0; i < (size.width * size.height); ++i) {
207 /* XXX: doesn't quite work */
208 // BOOST_REQUIRE_EQUAL (*p++, *q++);