QmlProfiler: Deduplicate color selection and saturate colors some more

The original timeline colors are hard to see on certain devices. This
makes them stand out more from the background.

Change-Id: Icf6ef8a8ea360b7f47609f8673c4c6e22b091296
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/qmlprofiler/abstracttimelinemodel.h

@@ -101,6 +101,29 @@ signals:
     void expandedChanged();
 
 protected:
+    enum BoxColorProperties {
+        EventHueMultiplier = 25,
+        FractionHueMultiplier = 96,
+        FractionHueMininimum = 10,
+        Saturation = 150,
+        Lightness = 166
+    };
+
+    QColor getEventColor(int index) const
+    {
+        return getColorByHue(getEventId(index) * EventHueMultiplier);
+    }
+
+    QColor getFractionColor(double fraction) const
+    {
+        return getColorByHue(fraction * FractionHueMultiplier + FractionHueMininimum);
+    }
+
+    QColor getColorByHue(int hue) const
+    {
+        return QColor::fromHsl(hue % 360, Saturation, Lightness);
+    }
+
     explicit AbstractTimelineModel(AbstractTimelineModelPrivate *dd, const QString &name,
                                    QObject *parent = 0);
     AbstractTimelineModelPrivate *d_ptr;

src/plugins/qmlprofiler/qmlprofilerpainteventsmodelproxy.cpp

@@ -179,7 +179,7 @@ QColor PaintEventsModelProxy::getColor(int index) const
         fpsFraction = 1.0;
     if (fpsFraction < 0.0)
         fpsFraction = 0.0;
-    return QColor::fromHsl((fpsFraction*96)+10, 76, 166);
+    return getFractionColor(fpsFraction);
 }
 
 float PaintEventsModelProxy::getHeight(int index) const

src/plugins/qmlprofiler/qmlprofilertimelinemodelproxy.cpp

@@ -373,8 +373,7 @@ int BasicTimelineModel::getBindingLoopDest(int index) const
 
 QColor BasicTimelineModel::getColor(int index) const
 {
-    int ndx = getEventId(index);
-    return QColor::fromHsl((ndx*25)%360, 76, 166);
+    return getEventColor(index);
 }
 
 const QVariantList BasicTimelineModel::getLabelsForCategory(int category) const