Add support for radial gradients to libmythui

Basic radial (not eliptical) gradient support, currently with a fixed
focus/centre of 50%x50% and radius of 50%. A later commit will add arguments
to change these values. <step> is permitted and works as it does for linear
gradients.

Use the 'direction="radial"' argument to <gradient>

Author: stuartm

mythtv/libs/libmythui/xmlparsebase.cpp

@@ -11,6 +11,7 @@
 #include <QString>
 #include <QBrush>
 #include <QLinearGradient>
+#include <QRadialGradient>
 
 // libmyth headers
 #include "mythlogging.h"
@@ -174,39 +175,12 @@ int XMLParseBase::parseAlignment(QDomElement &element)
 
 QBrush XMLParseBase::parseGradient(const QDomElement &element)
 {
-    QLinearGradient gradient;
+    QBrush brush;
     QString gradientStart = element.attribute("start", "");
     QString gradientEnd = element.attribute("end", "");
     int gradientAlpha = element.attribute("alpha", "255").toInt();
     QString direction = element.attribute("direction", "vertical");
 
-    float x1, y1, x2, y2 = 0.0;
-    if (direction == "vertical")
-    {
-        x1 = 0.5;
-        x2 = 0.5;
-        y1 = 0.0;
-        y2 = 1.0;
-    }
-    else if (direction == "diagonal")
-    {
-        x1 = 0.0;
-        x2 = 1.0;
-        y1 = 0.0;
-        y2 = 1.0;
-    }
-    else
-    {
-        x1 = 0.0;
-        x2 = 1.0;
-        y1 = 0.5;
-        y2 = 0.5;
-    }
-
-    gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
-    gradient.setStart(x1, y1);
-    gradient.setFinalStop(x2, y2);
-
     QGradientStops stops;
 
     if (!gradientStart.isEmpty())
@@ -217,14 +191,6 @@ QBrush XMLParseBase::parseGradient(const QDomElement &element)
         stops.append(stop);
     }
 
-    if (!gradientEnd.isEmpty())
-    {
-        QColor endColor = QColor(gradientEnd);
-        endColor.setAlpha(gradientAlpha);
-        QGradientStop stop(1.0, endColor);
-        stops.append(stop);
-    }
-
     for (QDomNode child = element.firstChild(); !child.isNull();
         child = child.nextSibling())
     {
@@ -243,9 +209,60 @@ QBrush XMLParseBase::parseGradient(const QDomElement &element)
         }
     }
 
-    gradient.setStops(stops);
+    if (!gradientEnd.isEmpty())
+    {
+        QColor endColor = QColor(gradientEnd);
+        endColor.setAlpha(gradientAlpha);
+        QGradientStop stop(1.0, endColor);
+        stops.append(stop);
+    }
+
+    if (direction == "radial")
+    {
+        QRadialGradient gradient;
+        gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
+        float x1 = 0.5, y1 = 0.5, radius = 0.5;
+        gradient.setCenter(x1,y1);
+        gradient.setFocalPoint(x1,y1);
+        gradient.setRadius(radius);
+        gradient.setStops(stops);
+        brush = QBrush(gradient);
+    }
+    else // Linear
+    {
+        QLinearGradient gradient;
+        gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
+        float x1 = 0.0, y1 = 0.0, x2 = 0.0, y2 = 0.0;
+        if (direction == "vertical")
+        {
+            x1 = 0.5;
+            x2 = 0.5;
+            y1 = 0.0;
+            y2 = 1.0;
+        }
+        else if (direction == "diagonal")
+        {
+            x1 = 0.0;
+            x2 = 1.0;
+            y1 = 0.0;
+            y2 = 1.0;
+        }
+        else // Horizontal
+        {
+            x1 = 0.0;
+            x2 = 1.0;
+            y1 = 0.5;
+            y2 = 0.5;
+        }
+
+        gradient.setStart(x1, y1);
+        gradient.setFinalStop(x2, y2);
+        gradient.setStops(stops);
+        brush = QBrush(gradient);
+    }
+
 
-    return QBrush(gradient);
+    return brush;
 }
 
 QString XMLParseBase::parseText(QDomElement &element)