xournalpp/test/util/ColorTest.cpp

/*
 * Xournal++
 *
 * This file is part of the Xournal UnitTests
 *
 * @author Xournal++ Team
 * https://github.com/xournalpp/xournalpp
 *
 * @license GNU GPLv2 or later
 */

#include <cppunit/extensions/HelperMacros.h>

#include "Color.h"

using namespace std;

bool operator==(GdkRGBA const& lhs, GdkRGBA const& rhs) noexcept {
    auto tieer = [](GdkRGBA const& val) { return std::tie(val.red, val.blue, val.green, val.alpha); };
    return tieer(lhs) == tieer(rhs);
}

std::ostream& operator<<(std::ostream& os, GdkRGBA const& val) {
    return os << "GdkRGBA{" << val.red << "," << val.green << "," << val.blue << "," << val.alpha << "}";
}

class ColorTest: public CppUnit::TestFixture {
    CPPUNIT_TEST_SUITE(ColorTest);

    CPPUNIT_TEST(testColorToRGB);
    CPPUNIT_TEST(testColorToRGBAndBack);

    CPPUNIT_TEST_SUITE_END();

public:
    void setUp() {}

    void tearDown() {}

    void testColorToRGB() {
        auto color1 = 0U;
        auto color2 = 0xffffffU;
        auto color3 = 0x7f7f7fU;
        auto color4 = 0x808080U;
        auto rgb1 = GdkRGBA{0.0, 0.0, 0.0, 1.0};
        auto rgb2 = GdkRGBA{1, 1, 1, 1.0};
        auto rgb3 = GdkRGBA{0.5, 0.5, 0.5, 1.0};
        auto rgb_t1 = Util::rgb_to_GdkRGBA(color1);
        CPPUNIT_ASSERT_EQUAL(rgb1, rgb_t1);
        auto rgb_t2 = Util::rgb_to_GdkRGBA(color2);
        CPPUNIT_ASSERT_EQUAL(rgb2, rgb_t2);
        auto rgb_t4 = Util::rgb_to_GdkRGBA(color4);
        auto rgb_t3 = Util::rgb_to_GdkRGBA(color3);
        auto rgb_t5 = GdkRGBA{(rgb_t3.red + rgb_t4.red) / 2, (rgb_t3.green + rgb_t4.green) / 2,
                              (rgb_t3.blue + rgb_t4.blue) / 2, 1};
        CPPUNIT_ASSERT_EQUAL(rgb3, rgb_t5);
    }

    void testColorToRGBAndBack() {
        for (size_t i = 0; i < 256; ++i) {
            Color color = i << 16U | i << 8U | i;
            Color color2 = color | i << 24U;
            CPPUNIT_ASSERT_EQUAL(color, Util::GdkRGBA_to_rgb(Util::rgb_to_GdkRGBA(color)));
            CPPUNIT_ASSERT_EQUAL(color2, Util::GdkRGBA_to_argb(Util::argb_to_GdkRGBA(color2)));
        }
    }
};

// Registers the fixture into the 'registry'
CPPUNIT_TEST_SUITE_REGISTRATION(ColorTest);