Use toSVGMarkerElement() instead of static_cast<>

Source/core/rendering/svg/RenderSVGResourceMarker.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 76 matching lines @@
 const AffineTransform& RenderSVGResourceMarker::localToParentTransform() const
 {
     m_localToParentTransform = AffineTransform::translation(m_viewport.x(), m_viewport.y()) * viewportTransform();
     return m_localToParentTransform;
     // If this class were ever given a localTransform(), then the above would read:
     // return viewportTranslation * localTransform() * viewportTransform();
 }
 
 FloatPoint RenderSVGResourceMarker::referencePoint() const
 {
-    SVGMarkerElement* marker = static_cast<SVGMarkerElement*>(node());
+    SVGMarkerElement* marker = toSVGMarkerElement(node());
     ASSERT(marker);
 
     SVGLengthContext lengthContext(marker);
     return FloatPoint(marker->refXCurrentValue().value(lengthContext), marker->refYCurrentValue().value(lengthContext));
 }
 
 float RenderSVGResourceMarker::angle() const
 {
-    SVGMarkerElement* marker = static_cast<SVGMarkerElement*>(node());
+    SVGMarkerElement* marker = toSVGMarkerElement(node());
     ASSERT(marker);
 
     float angle = -1;
     if (marker->orientTypeCurrentValue() == SVGMarkerOrientAngle)
         angle = marker->orientAngleCurrentValue().value();
 
     return angle;
 }
 
 AffineTransform RenderSVGResourceMarker::markerTransformation(const FloatPoint& origin, float autoAngle, float strokeWidth) const
 {
-    SVGMarkerElement* marker = static_cast<SVGMarkerElement*>(node());
+    SVGMarkerElement* marker = toSVGMarkerElement(node());
     ASSERT(marker);
 
     float markerAngle = angle();
     bool useStrokeWidth = marker->markerUnitsCurrentValue() == SVGMarkerUnitsStrokeWidth;
 
     AffineTransform transform;
     transform.translate(origin.x(), origin.y());
     transform.rotate(markerAngle == -1 ? autoAngle : markerAngle);
     transform = markerContentTransformation(transform, referencePoint(), useStrokeWidth ? strokeWidth : -1);
     return transform;
@@ skipping 21 matching lines @@
     AffineTransform transformation = contentTransformation;
     if (strokeWidth != -1)
         transformation.scaleNonUniform(strokeWidth, strokeWidth);
 
     transformation.translate(-mappedOrigin.x(), -mappedOrigin.y());
     return transformation;
 }
 
 AffineTransform RenderSVGResourceMarker::viewportTransform() const
 {
-    SVGMarkerElement* marker = static_cast<SVGMarkerElement*>(node());
+    SVGMarkerElement* marker = toSVGMarkerElement(node());
     ASSERT(marker);
 
     return marker->viewBoxToViewTransform(m_viewport.width(), m_viewport.height());
 }
 
 void RenderSVGResourceMarker::calcViewport()
 {
     if (!selfNeedsLayout())
         return;
 
-    SVGMarkerElement* marker = static_cast<SVGMarkerElement*>(node());
+    SVGMarkerElement* marker = toSVGMarkerElement(node());
     ASSERT(marker);
     
     SVGLengthContext lengthContext(marker);
     float w = marker->markerWidthCurrentValue().value(lengthContext);
     float h = marker->markerHeightCurrentValue().value(lengthContext);
     m_viewport = FloatRect(0, 0, w, h);
 }
 
 }