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/*
Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
This file is part of libdcp.
libdcp is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libdcp is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libdcp. If not, see <http://www.gnu.org/licenses/>.
*/
#include "rgb_xyz.h"
#include "openjpeg_image.h"
#include "colour_conversion.h"
#include <boost/test/unit_test.hpp>
#include <boost/bind.hpp>
#include <boost/scoped_array.hpp>
using std::max;
using std::list;
using std::string;
using std::cout;
using boost::shared_ptr;
using boost::optional;
using boost::scoped_array;
/** Convert a test image from sRGB to XYZ and check that the transforms are right */
BOOST_AUTO_TEST_CASE (rgb_xyz_test)
{
srand (0);
dcp::Size const size (640, 480);
scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
for (int y = 0; y < size.height; ++y) {
uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
for (int x = 0; x < size.width; ++x) {
/* Write a 12-bit random number for each component */
for (int c = 0; c < 3; ++c) {
*p = (rand () & 0xfff) << 4;
++p;
}
}
}
shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
for (int y = 0; y < size.height; ++y) {
uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
for (int x = 0; x < size.width; ++x) {
double cr = *p++ / 65535.0;
double cg = *p++ / 65535.0;
double cb = *p++ / 65535.0;
/* Input gamma */
if (cr < 0.04045) {
cr /= 12.92;
} else {
cr = pow ((cr + 0.055) / 1.055, 2.4);
}
if (cg < 0.04045) {
cg /= 12.92;
} else {
cg = pow ((cg + 0.055) / 1.055, 2.4);
}
if (cb < 0.04045) {
cb /= 12.92;
} else {
cb = pow ((cb + 0.055) / 1.055, 2.4);
}
/* Matrix */
double cx = cr * 0.4124564 + cg * 0.3575761 + cb * 0.1804375;
double cy = cr * 0.2126729 + cg * 0.7151522 + cb * 0.0721750;
double cz = cr * 0.0193339 + cg * 0.1191920 + cb * 0.9503041;
/* Compand */
cx *= 48 / 52.37;
cy *= 48 / 52.37;
cz *= 48 / 52.37;
/* Output gamma */
cx = pow (cx, 1 / 2.6);
cy = pow (cy, 1 / 2.6);
cz = pow (cz, 1 / 2.6);
BOOST_REQUIRE_CLOSE (cx * 4095, xyz->data(0)[y * size.width + x], 1);
BOOST_REQUIRE_CLOSE (cy * 4095, xyz->data(1)[y * size.width + x], 1);
BOOST_REQUIRE_CLOSE (cz * 4095, xyz->data(2)[y * size.width + x], 1);
}
}
}
static list<string> notes;
static void
note_handler (dcp::NoteType n, string s)
{
BOOST_REQUIRE_EQUAL (n, dcp::DCP_NOTE);
notes.push_back (s);
}
/** Check that xyz_to_rgb clamps XYZ values correctly */
BOOST_AUTO_TEST_CASE (xyz_rgb_range_test)
{
shared_ptr<dcp::OpenJPEGImage> xyz (new dcp::OpenJPEGImage (dcp::Size (2, 2)));
xyz->data(0)[0] = -4;
xyz->data(0)[1] = 6901;
xyz->data(0)[2] = 0;
xyz->data(0)[3] = 4095;
xyz->data(1)[0] = -4;
xyz->data(1)[1] = 6901;
xyz->data(1)[2] = 0;
xyz->data(1)[3] = 4095;
xyz->data(2)[0] = -4;
xyz->data(2)[1] = 6901;
xyz->data(2)[2] = 0;
xyz->data(2)[3] = 4095;
scoped_array<uint8_t> rgb (new uint8_t[2 * 2 * 6]);
notes.clear ();
dcp::xyz_to_rgb (
xyz, dcp::ColourConversion::srgb_to_xyz (), rgb.get(), 2 * 6, boost::optional<dcp::NoteHandler> (boost::bind (¬e_handler, _1, _2))
);
/* The 6 out-of-range samples should have been noted */
BOOST_REQUIRE_EQUAL (notes.size(), 6);
list<string>::const_iterator i = notes.begin ();
BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
BOOST_REQUIRE_EQUAL (*i++, "XYZ value -4 out of range");
BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
BOOST_REQUIRE_EQUAL (*i++, "XYZ value 6901 out of range");
/* And those samples should have been clamped, so check that they give the same result
as inputs at the extremes (0 and 4095).
*/
uint16_t* buffer = reinterpret_cast<uint16_t*> (rgb.get ());
BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 0], buffer[2 * 3 + 1]);
BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 1], buffer[2 * 3 + 1]);
BOOST_REQUIRE_EQUAL (buffer[0 * 3 + 2], buffer[2 * 3 + 2]);
BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 0], buffer[3 * 3 + 0]);
BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 1], buffer[3 * 3 + 1]);
BOOST_REQUIRE_EQUAL (buffer[1 * 3 + 2], buffer[3 * 3 + 2]);
}
/** Convert an image from RGB to XYZ and back again */
BOOST_AUTO_TEST_CASE (rgb_xyz_round_trip_test)
{
srand (0);
dcp::Size const size (640, 480);
scoped_array<uint8_t> rgb (new uint8_t[size.width * size.height * 6]);
for (int y = 0; y < size.height; ++y) {
uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get() + y * size.width * 6);
for (int x = 0; x < size.width; ++x) {
/* Write a 12-bit random number for each component */
for (int c = 0; c < 3; ++c) {
*p = (rand () & 0xfff) << 4;
++p;
}
}
}
shared_ptr<dcp::OpenJPEGImage> xyz = dcp::rgb_to_xyz (rgb.get(), size, size.width * 6, dcp::ColourConversion::srgb_to_xyz ());
scoped_array<uint8_t> back (new uint8_t[size.width * size.height * 6]);
dcp::xyz_to_rgb (xyz, dcp::ColourConversion::srgb_to_xyz (), back.get(), size.width * 6);
#if 0
uint16_t* p = reinterpret_cast<uint16_t*> (rgb.get ());
uint16_t* q = reinterpret_cast<uint16_t*> (back.get ());
for (int i = 0; i < (size.width * size.height); ++i) {
/* XXX: doesn't quite work */
// BOOST_REQUIRE_EQUAL (*p++, *q++);
}
#endif
}
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