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#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"
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