2 Copyright (C) 2014-2015 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/>.
21 #include "openjpeg_image.h"
22 #include "colour_conversion.h"
23 #include <boost/test/unit_test.hpp>
24 #include <boost/bind.hpp>
25 #include <boost/scoped_array.hpp>
31 using boost::shared_ptr;
32 using boost::optional;
33 using boost::scoped_array;
35 /** Convert a test image from sRGB to XYZ and check that the transforms are right */
36 BOOST_AUTO_TEST_CASE (rgb_xyz_test)
39 dcp::Size const size (640, 480);
41 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
42 for (int y = 0; y < size.height; ++y) {
43 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
44 for (int x = 0; x < size.width; ++x) {
45 /* Write a 12-bit random number for each component */
46 for (int c = 0; c < 3; ++c) {
47 *p = (rand () & 0xfff) << 4;
53 shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
55 for (int y = 0; y < size.height; ++y) {
56 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
57 for (int x = 0; x < size.width; ++x) {
59 double cr = *p++ / 65535.0;
60 double cg = *p++ / 65535.0;
61 double cb = *p++ / 65535.0;
68 cr = pow ((cr + 0.055) / 1.055, 2.4);
74 cg = pow ((cg + 0.055) / 1.055, 2.4);
80 cb = pow ((cb + 0.055) / 1.055, 2.4);
85 double cx = cr * 0.4124564 + cg * 0.3575761 + cb * 0.1804375;
86 double cy = cr * 0.2126729 + cg * 0.7151522 + cb * 0.0721750;
87 double cz = cr * 0.0193339 + cg * 0.1191920 + cb * 0.9503041;
97 cx = pow (cx, 1 / 2.6);
98 cy = pow (cy, 1 / 2.6);
99 cz = pow (cz, 1 / 2.6);
101 BOOST_REQUIRE_CLOSE (cx * 4095, xyz->data(0)[y * size.width + x], 1);
102 BOOST_REQUIRE_CLOSE (cy * 4095, xyz->data(1)[y * size.width + x], 1);
103 BOOST_REQUIRE_CLOSE (cz * 4095, xyz->data(2)[y * size.width + x], 1);
108 static list<string> notes;
111 note_handler (dcp::NoteType n, string s)
113 BOOST_REQUIRE_EQUAL (n, dcp::DCP_NOTE);
117 /** Check that xyz_to_rgb clamps XYZ values correctly */
118 BOOST_AUTO_TEST_CASE (xyz_rgb_range_test)
120 shared_ptr<dcp::OpenJPEGImage> xyz (new dcp::OpenJPEGImage (dcp::Size (2, 2)));
122 xyz->data(0)[0] = -4;
123 xyz->data(0)[1] = 6901;
125 xyz->data(0)[3] = 4095;
126 xyz->data(1)[0] = -4;
127 xyz->data(1)[1] = 6901;
129 xyz->data(1)[3] = 4095;
130 xyz->data(2)[0] = -4;
131 xyz->data(2)[1] = 6901;
133 xyz->data(2)[3] = 4095;
135 scoped_array<uint8_t> rgb (new uint8_t[2 * 2 * 6]);
139 xyz, dcp::ColourConversion::srgb_to_xyz (), rgb.get(), 2 * 6, boost::optional<dcp::NoteHandler> (boost::bind (¬e_handler, _1, _2))
142 /* The 6 out-of-range samples should have been noted */
143 BOOST_REQUIRE_EQUAL (notes.size(), 6);
144 list<string>::const_iterator i = notes.begin ();
145 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
146 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
147 BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
148 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
149 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
150 BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
152 /* And those samples should have been clamped, so check that they give the same result
153 as inputs at the extremes (0 and 4095).
156 uint16_t* buffer = reinterpret_cast<uint16_t*> (rgb.get ());
157 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 0], buffer[2 * 3 + 1]);
158 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 1], buffer[2 * 3 + 1]);
159 BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 2], buffer[2 * 3 + 2]);
161 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 0], buffer[3 * 3 + 0]);
162 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 1], buffer[3 * 3 + 1]);
163 BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 2], buffer[3 * 3 + 2]);
166 /** Convert an image from RGB to XYZ and back again */
167 BOOST_AUTO_TEST_CASE (rgb_xyz_round_trip_test)
170 dcp::Size const size (640, 480);
172 scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
173 for (int y = 0; y < size.height; ++y) {
174 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
175 for (int x = 0; x < size.width; ++x) {
176 /* Write a 12-bit random number for each component */
177 for (int c = 0; c < 3; ++c) {
178 *p = (rand () & 0xfff) << 4;
184 shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
185 scoped_array<uint8_t> back (new uint8_t[size.width * size.height * 6]);
186 dcp::xyz_to_rgb (xyz, dcp::ColourConversion::srgb_to_xyz (), back.get(), size.width * 6);
189 uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get ());
190 uint16_t* q = reinterpret_cast<uint16_t*> (back.get ());
191 for (int i = 0; i < (size.width * size.height); ++i) {
192 /* XXX: doesn't quite work */
193 // BOOST_REQUIRE_EQUAL (*p++, *q++);