kwin/autotests/test_colorspaces.cpp

193 lines
9.6 KiB
C++

/*
SPDX-FileCopyrightText: 2023 Xaver Hugl <xaver.hugl@gmail.com>
SPDX-License-Identifier: LGPL-2.0-or-later
*/
#include <QTest>
#include "core/colorpipeline.h"
#include "core/colorspace.h"
using namespace KWin;
class TestColorspaces : public QObject
{
Q_OBJECT
public:
TestColorspaces() = default;
private Q_SLOTS:
void roundtripConversion_data();
void roundtripConversion();
void nonNormalizedPrimaries();
void testIdentityTransformation_data();
void testIdentityTransformation();
void testColorPipeline_data();
void testColorPipeline();
};
static bool compareVectors(const QVector3D &one, const QVector3D &two, float maxDifference)
{
const bool ret = std::abs(one.x() - two.x()) <= maxDifference
&& std::abs(one.y() - two.y()) <= maxDifference
&& std::abs(one.z() - two.z()) <= maxDifference;
if (!ret) {
qWarning() << one << "!=" << two << "within" << maxDifference;
}
return ret;
}
static const double s_resolution10bit = std::pow(1.0 / 2.0, 10);
void TestColorspaces::roundtripConversion_data()
{
QTest::addColumn<NamedColorimetry>("srcColorimetry");
QTest::addColumn<TransferFunction::Type>("srcTransferFunction");
QTest::addColumn<NamedColorimetry>("dstColorimetry");
QTest::addColumn<TransferFunction::Type>("dstTransferFunction");
QTest::addColumn<double>("requiredAccuracy");
QTest::addRow("BT709 (sRGB) <-> BT2020 (linear)") << NamedColorimetry::BT709 << TransferFunction::sRGB << NamedColorimetry::BT2020 << TransferFunction::linear << s_resolution10bit;
QTest::addRow("BT709 (gamma 2.2) <-> BT2020 (linear)") << NamedColorimetry::BT709 << TransferFunction::gamma22 << NamedColorimetry::BT2020 << TransferFunction::linear << s_resolution10bit;
QTest::addRow("BT709 (linear) <-> BT2020 (linear)") << NamedColorimetry::BT709 << TransferFunction::linear << NamedColorimetry::BT2020 << TransferFunction::linear << s_resolution10bit;
QTest::addRow("BT709 (PQ) <-> BT2020 (linear)") << NamedColorimetry::BT709 << TransferFunction::PerceptualQuantizer << NamedColorimetry::BT2020 << TransferFunction::linear << 3 * s_resolution10bit;
}
void TestColorspaces::roundtripConversion()
{
QFETCH(NamedColorimetry, srcColorimetry);
QFETCH(TransferFunction::Type, srcTransferFunction);
QFETCH(NamedColorimetry, dstColorimetry);
QFETCH(TransferFunction::Type, dstTransferFunction);
QFETCH(double, requiredAccuracy);
const auto src = ColorDescription(srcColorimetry, TransferFunction(srcTransferFunction), 100, 0, 100, 100);
const auto dst = ColorDescription(dstColorimetry, TransferFunction(dstTransferFunction), 100, 0, 100, 100);
const QVector3D red(1, 0, 0);
const QVector3D green(0, 1, 0);
const QVector3D blue(0, 0, 1);
const QVector3D white(1, 1, 1);
constexpr std::array renderingIntents = {
RenderingIntent::RelativeColorimetric,
RenderingIntent::AbsoluteColorimetric,
};
for (const RenderingIntent intent : renderingIntents) {
QVERIFY(compareVectors(dst.mapTo(src.mapTo(red, dst, intent), src, intent), red, requiredAccuracy));
QVERIFY(compareVectors(dst.mapTo(src.mapTo(green, dst, intent), src, intent), green, requiredAccuracy));
QVERIFY(compareVectors(dst.mapTo(src.mapTo(blue, dst, intent), src, intent), blue, requiredAccuracy));
QVERIFY(compareVectors(dst.mapTo(src.mapTo(white, dst, intent), src, intent), white, requiredAccuracy));
}
}
void TestColorspaces::nonNormalizedPrimaries()
{
// this test ensures that non-normalized primaries don't mess up the transformations between color spaces
const auto &from = ColorDescription::sRGB;
const ColorDescription to(Colorimetry(Colorimetry::xyToXYZ(from.containerColorimetry().red()) * 2, Colorimetry::xyToXYZ(from.containerColorimetry().green()) * 2, Colorimetry::xyToXYZ(from.containerColorimetry().blue()) * 2, Colorimetry::xyToXYZ(from.containerColorimetry().white()) * 2), from.transferFunction(), from.referenceLuminance(), from.minLuminance(), from.maxAverageLuminance(), from.maxHdrLuminance());
const auto convertedWhite = from.toOther(to, RenderingIntent::RelativeColorimetric) * QVector3D(1, 1, 1);
QCOMPARE_LE(std::abs(1 - convertedWhite.x()), s_resolution10bit);
QCOMPARE_LE(std::abs(1 - convertedWhite.y()), s_resolution10bit);
QCOMPARE_LE(std::abs(1 - convertedWhite.z()), s_resolution10bit);
}
void TestColorspaces::testIdentityTransformation_data()
{
QTest::addColumn<NamedColorimetry>("colorimetry");
QTest::addColumn<TransferFunction::Type>("transferFunction");
QTest::addRow("BT709 (sRGB)") << NamedColorimetry::BT709 << TransferFunction::sRGB;
QTest::addRow("BT709 (gamma22)") << NamedColorimetry::BT709 << TransferFunction::gamma22;
QTest::addRow("BT709 (PQ)") << NamedColorimetry::BT709 << TransferFunction::PerceptualQuantizer;
QTest::addRow("BT709 (linear)") << NamedColorimetry::BT709 << TransferFunction::linear;
QTest::addRow("BT2020 (sRGB)") << NamedColorimetry::BT2020 << TransferFunction::sRGB;
QTest::addRow("BT2020 (gamma22)") << NamedColorimetry::BT2020 << TransferFunction::gamma22;
QTest::addRow("BT2020 (PQ)") << NamedColorimetry::BT2020 << TransferFunction::PerceptualQuantizer;
QTest::addRow("BT2020 (linear)") << NamedColorimetry::BT2020 << TransferFunction::linear;
}
void TestColorspaces::testIdentityTransformation()
{
QFETCH(NamedColorimetry, colorimetry);
QFETCH(TransferFunction::Type, transferFunction);
const ColorDescription color(colorimetry, TransferFunction(transferFunction), 100, 0, 100, 100);
constexpr std::array renderingIntents = {
RenderingIntent::Perceptual,
RenderingIntent::RelativeColorimetric,
RenderingIntent::AbsoluteColorimetric,
};
for (const RenderingIntent intent : renderingIntents) {
const auto pipeline = ColorPipeline::create(color, color, intent);
if (!pipeline.isIdentity()) {
qWarning() << pipeline;
}
QVERIFY(pipeline.isIdentity());
}
}
void TestColorspaces::testColorPipeline_data()
{
QTest::addColumn<ColorDescription>("srcColor");
QTest::addColumn<ColorDescription>("dstColor");
QTest::addColumn<QVector3D>("dstBlack");
QTest::addColumn<QVector3D>("dstGray");
QTest::addColumn<QVector3D>("dstWhite");
QTest::addColumn<RenderingIntent>("intent");
QTest::addRow("sRGB -> rec.2020 relative colorimetric")
<< ColorDescription(NamedColorimetry::BT709, TransferFunction(TransferFunction::gamma22), TransferFunction::defaultReferenceLuminanceFor(TransferFunction::gamma22), 0, std::nullopt, std::nullopt)
<< ColorDescription(NamedColorimetry::BT2020, TransferFunction(TransferFunction::PerceptualQuantizer), 500, 0, std::nullopt, std::nullopt)
<< QVector3D(0.06729, 0.06729, 0.06729)
<< QVector3D(0.51667, 0.51667, 0.51667)
<< QVector3D(0.67658, 0.67658, 0.67658)
<< RenderingIntent::RelativeColorimetric;
QTest::addRow("sRGB -> scRGB relative colorimetric")
<< ColorDescription(NamedColorimetry::BT709, TransferFunction(TransferFunction::gamma22), TransferFunction::defaultReferenceLuminanceFor(TransferFunction::gamma22), 0, std::nullopt, std::nullopt)
<< ColorDescription(NamedColorimetry::BT709, TransferFunction(TransferFunction::linear, 0, 80), 80, 0, std::nullopt, std::nullopt)
<< QVector3D(0.00025, 0.00025, 0.00025)
<< QVector3D(0.217833, 0.217833, 0.217833)
<< QVector3D(1, 1, 1)
<< RenderingIntent::RelativeColorimetric;
QTest::addRow("sRGB -> rec.2020 relative colorimetric with bpc")
<< ColorDescription(NamedColorimetry::BT709, TransferFunction(TransferFunction::gamma22, 0.2, 80), 80, 0.2, std::nullopt, std::nullopt)
<< ColorDescription(NamedColorimetry::BT2020, TransferFunction(TransferFunction::PerceptualQuantizer, 0.005, 10'000), 500, 0.005, std::nullopt, std::nullopt)
<< QVector3D(0, 0, 0)
<< QVector3D(0.51667, 0.51667, 0.51667)
<< QVector3D(0.67658, 0.67658, 0.67658)
<< RenderingIntent::RelativeColorimetricWithBPC;
QTest::addRow("scRGB -> scRGB relative colorimetric with bpc")
<< ColorDescription(NamedColorimetry::BT709, TransferFunction(TransferFunction::linear, 0, 80), TransferFunction::defaultReferenceLuminanceFor(TransferFunction::gamma22), 0, std::nullopt, std::nullopt)
<< ColorDescription(NamedColorimetry::BT709, TransferFunction(TransferFunction::linear, 8, 80), 80, 8, std::nullopt, std::nullopt)
<< QVector3D(0, 0, 0)
<< QVector3D(0.5, 0.5, 0.5)
<< QVector3D(1, 1, 1)
<< RenderingIntent::RelativeColorimetricWithBPC;
}
void TestColorspaces::testColorPipeline()
{
QFETCH(ColorDescription, srcColor);
QFETCH(ColorDescription, dstColor);
QFETCH(QVector3D, dstBlack);
QFETCH(QVector3D, dstGray);
QFETCH(QVector3D, dstWhite);
QFETCH(RenderingIntent, intent);
const auto pipeline = ColorPipeline::create(srcColor, dstColor, intent);
QVERIFY(compareVectors(pipeline.evaluate(QVector3D(0, 0, 0)), dstBlack, s_resolution10bit));
QVERIFY(compareVectors(pipeline.evaluate(QVector3D(0.5, 0.5, 0.5)), dstGray, s_resolution10bit));
QVERIFY(compareVectors(pipeline.evaluate(QVector3D(1, 1, 1)), dstWhite, s_resolution10bit));
const auto inversePipeline = ColorPipeline::create(dstColor, srcColor, intent);
QVERIFY(compareVectors(inversePipeline.evaluate(dstBlack), QVector3D(0, 0, 0), s_resolution10bit));
QVERIFY(compareVectors(inversePipeline.evaluate(dstGray), QVector3D(0.5, 0.5, 0.5), s_resolution10bit));
QVERIFY(compareVectors(inversePipeline.evaluate(dstWhite), QVector3D(1, 1, 1), s_resolution10bit));
}
QTEST_MAIN(TestColorspaces)
#include "test_colorspaces.moc"