Add colorspace transfer functions based on tables of inputs

This is the most basic way to represent custom transfer functions.

Change-Id: I529fb647ece82c03e85ef77b056d9daf13fe5a61
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/auto/gui/painting/qcolorspace/tst_qcolorspace.cpp b/tests/auto/gui/painting/qcolorspace/tst_qcolorspace.cpp
index 3564700fe5..4acbfbba74 100644
--- a/tests/auto/gui/painting/qcolorspace/tst_qcolorspace.cpp
+++ b/tests/auto/gui/painting/qcolorspace/tst_qcolorspace.cpp
@@ -74,6 +74,8 @@ private slots:
 
     void changeTransferFunction();
     void changePrimaries();
+
+    void transferFunctionTable();
 };
 
 tst_QColorSpace::tst_QColorSpace()
@@ -468,5 +470,32 @@ void tst_QColorSpace::changePrimaries()
     QCOMPARE(cs, QColorSpace(QColorSpace::SRgbLinear));
 }
 
+void tst_QColorSpace::transferFunctionTable()
+{
+    QVector<quint16> linearTable = { 0, 65535 };
+
+    // Check linearSRgb is recognized
+    QColorSpace linearSRgb(QColorSpace::Primaries::SRgb, linearTable);
+    QCOMPARE(linearSRgb.primaries(), QColorSpace::Primaries::SRgb);
+    QCOMPARE(linearSRgb.transferFunction(), QColorSpace::TransferFunction::Linear);
+    QCOMPARE(linearSRgb.gamma(), 1.0);
+    QCOMPARE(linearSRgb, QColorSpace::SRgbLinear);
+
+    // Check other linear is recognized
+    QColorSpace linearARgb(QColorSpace::Primaries::AdobeRgb, linearTable);
+    QCOMPARE(linearARgb.primaries(), QColorSpace::Primaries::AdobeRgb);
+    QCOMPARE(linearARgb.transferFunction(), QColorSpace::TransferFunction::Linear);
+    QCOMPARE(linearARgb.gamma(), 1.0);
+
+    // Check custom transfer function.
+    QVector<quint16> customTable = { 0, 10, 100, 10000, 65535 };
+    QColorSpace customSRgb(QColorSpace::Primaries::SRgb, customTable);
+    QCOMPARE(customSRgb.primaries(), QColorSpace::Primaries::SRgb);
+    QCOMPARE(customSRgb.transferFunction(), QColorSpace::TransferFunction::Custom);
+
+    customSRgb.setTransferFunction(linearTable);
+    QCOMPARE(customSRgb, QColorSpace::SRgbLinear);
+}
+
 QTEST_MAIN(tst_QColorSpace)
 #include "tst_qcolorspace.moc"