90 lines
3.9 KiB
C++
90 lines
3.9 KiB
C++
/*
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SPDX-FileCopyrightText: 2023 Xaver Hugl <xaver.hugl@gmail.com>
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SPDX-License-Identifier: LGPL-2.0-or-later
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*/
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#include <QTest>
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#include "core/colorspace.h"
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using namespace KWin;
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class TestColorspaces : public QObject
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{
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Q_OBJECT
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public:
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TestColorspaces() = default;
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private Q_SLOTS:
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void roundtripConversion_data();
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void roundtripConversion();
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void nonNormalizedPrimaries();
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};
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static bool compareVectors(const QVector3D &one, const QVector3D &two, float maxDifference)
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{
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const bool ret = std::abs(one.x() - two.x()) <= maxDifference
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&& std::abs(one.y() - two.y()) <= maxDifference
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&& std::abs(one.z() - two.z()) <= maxDifference;
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if (!ret) {
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qWarning() << one << "!=" << two << "within" << maxDifference;
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}
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return ret;
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}
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static const double s_resolution10bit = std::pow(1.0 / 2.0, 10);
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void TestColorspaces::roundtripConversion_data()
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{
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QTest::addColumn<NamedColorimetry>("srcColorimetry");
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QTest::addColumn<NamedTransferFunction>("srcTransferFunction");
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QTest::addColumn<NamedColorimetry>("dstColorimetry");
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QTest::addColumn<NamedTransferFunction>("dstTransferFunction");
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QTest::addColumn<double>("requiredAccuracy");
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QTest::addRow("BT709 (sRGB) <-> BT2020 (linear)") << NamedColorimetry::BT709 << NamedTransferFunction::sRGB << NamedColorimetry::BT2020 << NamedTransferFunction::linear << s_resolution10bit;
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QTest::addRow("BT709 (gamma 2.2) <-> BT2020 (linear)") << NamedColorimetry::BT709 << NamedTransferFunction::gamma22 << NamedColorimetry::BT2020 << NamedTransferFunction::linear << s_resolution10bit;
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QTest::addRow("BT709 (scRGB) <-> BT2020 (linear)") << NamedColorimetry::BT709 << NamedTransferFunction::scRGB << NamedColorimetry::BT2020 << NamedTransferFunction::linear << s_resolution10bit;
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QTest::addRow("BT709 (linear) <-> BT2020 (linear)") << NamedColorimetry::BT709 << NamedTransferFunction::linear << NamedColorimetry::BT2020 << NamedTransferFunction::linear << s_resolution10bit;
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QTest::addRow("BT709 (PQ) <-> BT2020 (linear)") << NamedColorimetry::BT709 << NamedTransferFunction::PerceptualQuantizer << NamedColorimetry::BT2020 << NamedTransferFunction::linear << 3 * s_resolution10bit;
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}
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void TestColorspaces::roundtripConversion()
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{
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QFETCH(NamedColorimetry, srcColorimetry);
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QFETCH(NamedTransferFunction, srcTransferFunction);
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QFETCH(NamedColorimetry, dstColorimetry);
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QFETCH(NamedTransferFunction, dstTransferFunction);
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QFETCH(double, requiredAccuracy);
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const auto src = ColorDescription(srcColorimetry, srcTransferFunction, 100, 0, 100, 100);
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const auto dst = ColorDescription(dstColorimetry, dstTransferFunction, 100, 0, 100, 100);
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const QVector3D red(1, 0, 0);
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const QVector3D green(0, 1, 0);
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const QVector3D blue(0, 0, 1);
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const QVector3D white(1, 1, 1);
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QVERIFY(compareVectors(dst.mapTo(src.mapTo(red, dst), src), red, requiredAccuracy));
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QVERIFY(compareVectors(dst.mapTo(src.mapTo(green, dst), src), green, requiredAccuracy));
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QVERIFY(compareVectors(dst.mapTo(src.mapTo(blue, dst), src), blue, requiredAccuracy));
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QVERIFY(compareVectors(dst.mapTo(src.mapTo(white, dst), src), white, requiredAccuracy));
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}
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void TestColorspaces::nonNormalizedPrimaries()
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{
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// this test ensures that non-normalized primaries don't mess up the transformations between color spaces
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const auto from = Colorimetry::fromName(NamedColorimetry::BT709);
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const auto to = Colorimetry(Colorimetry::xyToXYZ(from.red()) * 2, Colorimetry::xyToXYZ(from.green()) * 2, Colorimetry::xyToXYZ(from.blue()) * 2, Colorimetry::xyToXYZ(from.white()) * 2);
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const auto convertedWhite = from.toOther(to) * QVector3D(1, 1, 1);
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QCOMPARE_LE(std::abs(1 - convertedWhite.x()), s_resolution10bit);
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QCOMPARE_LE(std::abs(1 - convertedWhite.y()), s_resolution10bit);
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QCOMPARE_LE(std::abs(1 - convertedWhite.z()), s_resolution10bit);
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}
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QTEST_MAIN(TestColorspaces)
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#include "test_colorspaces.moc"
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