Use isSVG*Element() helpers more in SVG code (Part 3)

Source/core/rendering/svg/RenderSVGEllipse.cpp

 /*
  * Copyright (C) 2012 Google, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 58 matching lines @@
 
     m_fillBoundingBox = FloatRect(m_center.x() - m_radii.width(), m_center.y() - m_radii.height(), 2 * m_radii.width(), 2 * m_radii.height());
     m_strokeBoundingBox = m_fillBoundingBox;
     if (style()->svgStyle()->hasStroke())
         m_strokeBoundingBox.inflate(strokeWidth() / 2);
 }
 
 void RenderSVGEllipse::calculateRadiiAndCenter()
 {
     ASSERT(element());
-    if (element()->hasTagName(SVGNames::circleTag)) {
-        SVGCircleElement* circle = toSVGCircleElement(element());
+    if (isSVGCircleElement(*element())) {
+        SVGCircleElement& circle = toSVGCircleElement(*element());
 
-        SVGLengthContext lengthContext(circle);
-        float radius = circle->r()->currentValue()->value(lengthContext);
+        SVGLengthContext lengthContext(&circle);
+        float radius = circle.r()->currentValue()->value(lengthContext);
         m_radii = FloatSize(radius, radius);
-        m_center = FloatPoint(circle->cx()->currentValue()->value(lengthContext), circle->cy()->currentValue()->value(lengthContext));
+        m_center = FloatPoint(circle.cx()->currentValue()->value(lengthContext), circle.cy()->currentValue()->value(lengthContext));
         return;
     }
 
-    SVGEllipseElement* ellipse = toSVGEllipseElement(element());
+    SVGEllipseElement& ellipse = toSVGEllipseElement(*element());
 
-    SVGLengthContext lengthContext(ellipse);
-    m_radii = FloatSize(ellipse->rx()->currentValue()->value(lengthContext), ellipse->ry()->currentValue()->value(lengthContext));
-    m_center = FloatPoint(ellipse->cx()->currentValue()->value(lengthContext), ellipse->cy()->currentValue()->value(lengthContext));
+    SVGLengthContext lengthContext(&ellipse);
+    m_radii = FloatSize(ellipse.rx()->currentValue()->value(lengthContext), ellipse.ry()->currentValue()->value(lengthContext));
+    m_center = FloatPoint(ellipse.cx()->currentValue()->value(lengthContext), ellipse.cy()->currentValue()->value(lengthContext));
 }
 
 void RenderSVGEllipse::fillShape(GraphicsContext* context) const
 {
     if (m_usePathFallback) {
         RenderSVGShape::fillShape(context);
         return;
     }
     context->fillEllipse(m_fillBoundingBox);
 }
@@ skipping 42 matching lines @@
     FloatPoint center = FloatPoint(m_center.x() - point.x(), m_center.y() - point.y());
 
     // This works by checking if the point satisfies the ellipse equation.
     // (x/rX)^2 + (y/rY)^2 <= 1
     float xrX = center.x() / m_radii.width();
     float yrY = center.y() / m_radii.height();
     return xrX * xrX + yrY * yrY <= 1.0;
 }
 
 }