File indexing completed on 2024-12-08 12:18:36

 #include "kcolorutilstest.h"
 
 #include <QTest>
 
 #include "../colors/kcolorspaces.cpp" // private implementation
 #include "../colors/kcolorspaces_p.h" // private header
 #include <kcolorutils.h>
 
 void tst_KColorUtils::testOverlay()
 {
     QColor color1(10, 10, 100);
     QColor color2(10, 10, 160);
     QColor blended = KColorUtils::overlayColors(color1, color2);
     QCOMPARE(blended, color2); // no transparency.
 
     QColor previous;
     // check that when altering the alpha of color2 to be less and less transparent this
     // means we are moving more and more towards color2
     for (int i = 10; i <= 255; i += 10) {
         color2.setAlpha(i);
         blended = KColorUtils::overlayColors(color1, color2);
         if (previous.isValid()) {
             QCOMPARE(previous.red(), 10);
             QCOMPARE(previous.green(), 10);
             QVERIFY(previous.blue() <= blended.blue());
         }
         previous = blended;
     }
 
     // only the alpha of color 2 alters the output
     color2.setAlpha(255); // opaque
     color1.setAlpha(80); // opaque
     blended = KColorUtils::overlayColors(color2, color2);
     QCOMPARE(blended.red(), color2.red());
     QCOMPARE(blended.green(), color2.green());
     QCOMPARE(blended.blue(), color2.blue());
 
     // merge from itself to itself gives; TADA; itself again ;)
     color2.setAlpha(127);
     blended = KColorUtils::overlayColors(color2, color2);
     QCOMPARE(blended.red(), color2.red());
     QCOMPARE(blended.green(), color2.green());
     QCOMPARE(blended.blue(), color2.blue());
 }
 
 /* clang-format off */
 #define compareColors(c1, c2) \
     if (c1 != c2) { \
         fprintf(stderr, "%08x != expected value %08x\n", c1.rgb(), c2.rgb()); \
         QCOMPARE(c1, c2); \
     } \
     (void)0
 /* clang-format on */
 
 void tst_KColorUtils::testMix()
 {
     int r;
     int g;
     int b;
     int k;
     for (r = 0; r < 52; r++) {
         for (g = 0; g < 52; g++) {
             for (b = 0; b < 52; b++) {
                 QColor color(r * 5, g * 5, b * 5);
                 // Test blend-to-black spectrum
                 for (k = 5; k >= 0; k--) {
                     QColor result = KColorUtils::mix(Qt::black, color, k * 0.2);
                     compareColors(result, QColor(r * k, g * k, b * k));
                 }
                 // Test blend-to-white spectrum
                 for (k = 5; k >= 0; k--) {
                     int n = 51 * (5 - k);
                     QColor result = KColorUtils::mix(Qt::white, color, k * 0.2);
                     compareColors(result, QColor(n + r * k, n + g * k, n + b * k));
                 }
                 // Test blend-to-self across a couple bias values
                 for (k = 5; k >= 0; k--) {
                     QColor result = KColorUtils::mix(color, color, k * 0.2);
                     compareColors(result, color);
                 }
             }
         }
     }
 
     const auto colorA = QColor::fromRgb(255, 255, 255, 1);
     const auto colorB = QColor::fromRgb(0, 0, 0, 255);
     const auto mixed = KColorUtils::mix(colorA, colorB, 0.5);
 
     QVERIFY2(mixed.redF() <= 0.01, "colorA should have little influence on colorB due to low opacity");
     QVERIFY2(mixed.greenF() <= 0.01, "colorA should have little influence on colorB due to low opacity");
     QVERIFY2(mixed.blueF() <= 0.01, "colorA should have little influence on colorB due to low opacity");
 }
 
 void tst_KColorUtils::testHCY()
 {
     int r;
     int g;
     int b;
     for (r = 0; r < 256; r += 5) {
         for (g = 0; g < 256; g += 5) {
             for (b = 0; b < 256; b += 5) {
                 QColor color(r, g, b);
                 KColorSpaces::KHCY hcy(color);
                 compareColors(hcy.qColor(), color);
             }
         }
     }
 }
 
 void tst_KColorUtils::testContrast()
 {
     QCOMPARE(KColorUtils::contrastRatio(Qt::black, Qt::white), qreal(21.0));
     QCOMPARE(KColorUtils::contrastRatio(Qt::white, Qt::black), qreal(21.0));
     QCOMPARE(KColorUtils::contrastRatio(Qt::black, Qt::black), qreal(1.0));
     QCOMPARE(KColorUtils::contrastRatio(Qt::white, Qt::white), qreal(1.0));
 
     // TODO better tests :-)
 }
 
 void checkIsGray(const QColor &color, int line)
 {
     KColorSpaces::KHCY hcy(color);
     if (hcy.c != qreal(0.0)) {
         fprintf(stderr, "%08x has chroma %g, expected gray!\n", color.rgb(), hcy.c);
     }
     QTest::qCompare(hcy.c, qreal(0.0), "hcy.c", "0.0", __FILE__, line);
 }
 
 void tst_KColorUtils::testShading()
 {
     const QColor testGray(128, 128, 128); // Qt::gray isn't pure gray!
 
     // Test that KHCY gets chroma correct for white/black, grays
     checkIsGray(Qt::white, __LINE__);
     checkIsGray(testGray, __LINE__);
     checkIsGray(Qt::black, __LINE__);
 
     // Test that lighten/darken/shade don't change chroma for grays
     checkIsGray(KColorUtils::shade(Qt::white, -0.1), __LINE__);
     checkIsGray(KColorUtils::shade(Qt::black, 0.1), __LINE__);
     checkIsGray(KColorUtils::darken(Qt::white, 0.1), __LINE__);
     checkIsGray(KColorUtils::darken(testGray, 0.1), __LINE__);
     checkIsGray(KColorUtils::darken(testGray, -0.1), __LINE__);
     checkIsGray(KColorUtils::darken(Qt::black, -0.1), __LINE__);
     checkIsGray(KColorUtils::lighten(Qt::black, 0.1), __LINE__);
     checkIsGray(KColorUtils::lighten(testGray, 0.1), __LINE__);
     checkIsGray(KColorUtils::lighten(testGray, -0.1), __LINE__);
     checkIsGray(KColorUtils::lighten(Qt::white, -0.1), __LINE__);
 }
 
 QTEST_MAIN(tst_KColorUtils)
 
 #include "moc_kcolorutilstest.cpp"