Tools/TestWebKitAPI/Tests/WebCore/ColorTests.cpp

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#include "config.h"

#include "Test.h"
#include <WebCore/Color.h>
#include <WebCore/ColorUtilities.h>

using namespace WebCore;

namespace TestWebKitAPI {

TEST(Color, RGBToHSL_White)
{
    Color color = Color::white;

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0, hslaColor.hue);
    EXPECT_FLOAT_EQ(0, hslaColor.saturation);
    EXPECT_FLOAT_EQ(1, hslaColor.lightness);
    
    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);
    
    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_Black)
{
    Color color = Color::black;

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0, hslaColor.hue);
    EXPECT_FLOAT_EQ(0, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0, hslaColor.lightness);

    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_Red)
{
    Color color = makeSimpleColor(255, 0, 0);

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0, hslaColor.hue);
    EXPECT_FLOAT_EQ(1, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0.5, hslaColor.lightness);

    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_Green)
{
    Color color = makeSimpleColor(0, 255, 0);

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0.33333334, hslaColor.hue);
    EXPECT_FLOAT_EQ(1, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0.5, hslaColor.lightness);

    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_Blue)
{
    Color color = makeSimpleColor(0, 0, 255);

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0.66666669, hslaColor.hue);
    EXPECT_FLOAT_EQ(1, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0.5, hslaColor.lightness);

    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_DarkGray)
{
    Color color = Color::darkGray;

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0, hslaColor.hue);
    EXPECT_FLOAT_EQ(0, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0.50196078431372548, hslaColor.lightness);
    
    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_Gray)
{
    Color color = Color::gray;

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0, hslaColor.hue);
    EXPECT_FLOAT_EQ(0, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0.62745098039215685, hslaColor.lightness);

    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, RGBToHSL_LightGray)
{
    Color color = Color::lightGray;

    auto hslaColor = toHSLA(color.toSRGBALossy());

    EXPECT_FLOAT_EQ(0, hslaColor.hue);
    EXPECT_FLOAT_EQ(0, hslaColor.saturation);
    EXPECT_FLOAT_EQ(0.75294117647058822, hslaColor.lightness);

    EXPECT_FLOAT_EQ(color.lightness(), hslaColor.lightness);

    auto roundTrippedColor = makeSimpleColor(toSRGBA(hslaColor));
    EXPECT_EQ(color, roundTrippedColor);
}

TEST(Color, Validity)
{
    Color invalidColor;
    EXPECT_FALSE(invalidColor.isValid());
    EXPECT_FALSE(invalidColor.isExtended());

    Color otherInvalidColor = invalidColor;
    EXPECT_FALSE(otherInvalidColor.isValid());
    EXPECT_FALSE(otherInvalidColor.isExtended());

    Color validColor = makeSimpleColor(255, 0, 0);
    EXPECT_TRUE(validColor.isValid());
    EXPECT_FALSE(validColor.isExtended());

    Color otherValidColor = validColor;
    EXPECT_TRUE(otherValidColor.isValid());
    EXPECT_FALSE(otherValidColor.isExtended());

    validColor = makeSimpleColor(1, 2, 3, 4);
    EXPECT_TRUE(validColor.isValid());
    EXPECT_FALSE(validColor.isExtended());
    auto simpleValidColor = validColor.toSRGBASimpleColorLossy();
    EXPECT_EQ(simpleValidColor.redComponent(), 1);
    EXPECT_EQ(simpleValidColor.greenComponent(), 2);
    EXPECT_EQ(simpleValidColor.blueComponent(), 3);
    EXPECT_EQ(simpleValidColor.alphaComponent(), 4);

    Color yetAnotherValidColor(WTFMove(validColor));
    EXPECT_TRUE(yetAnotherValidColor.isValid());
    EXPECT_FALSE(yetAnotherValidColor.isExtended());
    auto simpleYetAnotherValidColor = yetAnotherValidColor.toSRGBASimpleColorLossy();
    EXPECT_EQ(simpleYetAnotherValidColor.redComponent(), 1);
    EXPECT_EQ(simpleYetAnotherValidColor.greenComponent(), 2);
    EXPECT_EQ(simpleYetAnotherValidColor.blueComponent(), 3);
    EXPECT_EQ(simpleYetAnotherValidColor.alphaComponent(), 4);

    otherValidColor = WTFMove(yetAnotherValidColor);
    EXPECT_TRUE(otherValidColor.isValid());
    EXPECT_FALSE(otherValidColor.isExtended());
    auto simpleOtherValidColor = otherValidColor.toSRGBASimpleColorLossy();
    EXPECT_EQ(simpleOtherValidColor.redComponent(), 1);
    EXPECT_EQ(simpleOtherValidColor.greenComponent(), 2);
    EXPECT_EQ(simpleOtherValidColor.blueComponent(), 3);
    EXPECT_EQ(simpleOtherValidColor.alphaComponent(), 4);
}

TEST(Color, Luminance)
{
    EXPECT_FLOAT_EQ(Color(Color::black).luminance(), 0);
    EXPECT_FLOAT_EQ(Color(Color::white).luminance(), 1);

    auto c = makeSimpleColor(85, 90, 160);
    EXPECT_FLOAT_EQ(Color(c).luminance(), 0.11781692);

    EXPECT_EQ(c.redComponent(), 85);
    EXPECT_EQ(c.greenComponent(), 90);
    EXPECT_EQ(c.blueComponent(), 160);

    auto cLigtened = Color(c).lightened().toSRGBASimpleColorLossy();
    EXPECT_FLOAT_EQ(Color(cLigtened).luminance(), 0.29168808);
    EXPECT_EQ(cLigtened.redComponent(), 130);
    EXPECT_EQ(cLigtened.greenComponent(), 137);
    EXPECT_EQ(cLigtened.blueComponent(), 244);

    auto cDarkened = Color(c).darkened().toSRGBASimpleColorLossy();
    EXPECT_FLOAT_EQ(Color(cDarkened).luminance(), 0.027006727);
    EXPECT_EQ(cDarkened.redComponent(), 40);
    EXPECT_EQ(cDarkened.greenComponent(), 43);
    EXPECT_EQ(cDarkened.blueComponent(), 76);
}

} // namespace TestWebKitAPI