QColor::toCmyk() does not convert the color if it is already in CMYK

QColor::toCmyk() converted the color to RGB and then to CMYK. If the color
was already in CMYK, this conversion change it.
The color is now returned directly if it is in CMYK

Reviewed-by: Ariya
Task-number: 253625

2 files changed, 23 insertions, 2 deletions

diff --git a/src/gui/painting/qcolor.cpp b/src/gui/painting/qcolor.cpp
index 5d7d4ab5b0..1723a197ed 100644
--- a/src/gui/painting/qcolor.cpp
+++ b/src/gui/painting/qcolor.cpp
@@ -1369,7 +1369,7 @@ QColor QColor::toRgb() const
 */
 QColor QColor::toHsv() const
 {
-    if (!isValid())
+    if (!isValid() || cspec == Hsv)
         return *this;
 
     if (cspec != Rgb)
@@ -1421,7 +1421,7 @@ QColor QColor::toHsv() const
 */
 QColor QColor::toCmyk() const
 {
-    if (!isValid())
+    if (!isValid() || cspec == Cmyk)
         return *this;
     if (cspec != Rgb)
         return toRgb().toCmyk();
diff --git a/tests/auto/qcolor/tst_qcolor.cpp b/tests/auto/qcolor/tst_qcolor.cpp
index 7608a15757..684d5b5628 100644
--- a/tests/auto/qcolor/tst_qcolor.cpp
+++ b/tests/auto/qcolor/tst_qcolor.cpp
@@ -111,12 +111,15 @@ private slots:
 
     void toRgb_data();
     void toRgb();
+    void toRgbNonDestructive();
 
     void toHsv_data();
     void toHsv();
+    void toHsvNonDestructive();
 
     void toCmyk_data();
     void toCmyk();
+    void toCmykNonDestructive();
 
     void convertTo();
 
@@ -1124,6 +1127,12 @@ void tst_QColor::toHsv_data()
         << QColor::fromCmykF(0., 1., 1., 0.);
 }
 
+void tst_QColor::toRgbNonDestructive()
+{
+    QColor aColor = QColor::fromRgbF(0.11, 0.22, 0.33, 0.44);
+    QCOMPARE(aColor, aColor.toRgb());
+}
+
 void tst_QColor::toHsv()
 {
     // invalid should remain invalid
@@ -1136,6 +1145,12 @@ void tst_QColor::toHsv()
     QCOMPARE(cmykColor.toHsv(), expectedColor);
 }
 
+void tst_QColor::toHsvNonDestructive()
+{
+    QColor aColor = QColor::fromHsvF(0.11, 0.22, 0.33, 0.44);
+    QCOMPARE(aColor, aColor.toHsv());
+}
+
 void tst_QColor::toCmyk_data()
 {
     QTest::addColumn<QColor>("expectedColor");
@@ -1165,6 +1180,12 @@ void tst_QColor::toCmyk()
     QCOMPARE(hsvColor.toCmyk(), expectedColor);
 }
 
+void tst_QColor::toCmykNonDestructive()
+{
+    QColor aColor = QColor::fromCmykF(0.11, 0.22, 0.33, 0.44);
+    QCOMPARE(aColor, aColor.toCmyk());
+}
+
 void tst_QColor::convertTo()
 {
     QColor color(Qt::black);