Add toSVGClipPathElement(), and use it

Source/core/rendering/svg/RenderSVGResourceClipper.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.
  * Copyright (C) 2011 Dirk Schulze <krit@webkit.org>
  *
  * 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 109 matching lines @@
             Path subPath;
             styled->toClipPath(subPath);
             subPath.setWindRule(svgStyle->clipRule());
             if (!clipPath.unionPath(subPath))
                 return false;
         } else {
             return false;
         }
     }
     // Only one visible shape/path was found. Directly continue clipping and transform the content to userspace if necessary.
-    if (static_cast<SVGClipPathElement*>(node())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
+    if (toSVGClipPathElement(node())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
         AffineTransform transform;
         transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
         transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         clipPath.transform(transform);
     }
 
     // Transform path by animatedLocalTransform.
     clipPath.transform(animatedLocalTransform);
 
     // The SVG specification wants us to clip everything, if clip-path doesn't have a child.
     if (clipPath.isEmpty())
         clipPath.addRect(FloatRect());
     context->clipPath(clipPath, clipRule);
     return true;
 }
 
 bool RenderSVGResourceClipper::applyClippingToContext(RenderObject* object, const FloatRect& objectBoundingBox,
                                                       const FloatRect& repaintRect, GraphicsContext* context)
 {
     bool missingClipperData = !m_clipper.contains(object);
     if (missingClipperData)
         m_clipper.set(object, new ClipperData);
 
     bool shouldCreateClipData = false;
-    AffineTransform animatedLocalTransform = static_cast<SVGClipPathElement*>(node())->animatedLocalTransform();
+    AffineTransform animatedLocalTransform = toSVGClipPathElement(node())->animatedLocalTransform();
     ClipperData* clipperData = m_clipper.get(object);
     if (!clipperData->clipMaskImage) {
         if (pathOnlyClipping(context, animatedLocalTransform, objectBoundingBox))
             return true;
         shouldCreateClipData = true;
     }
 
     AffineTransform absoluteTransform;
     SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(object, absoluteTransform);
 
@@ skipping 35 matching lines @@
 bool RenderSVGResourceClipper::drawContentIntoMaskImage(ClipperData* clipperData, const FloatRect& objectBoundingBox)
 {
     ASSERT(frame());
     ASSERT(clipperData);
     ASSERT(clipperData->clipMaskImage);
 
     GraphicsContext* maskContext = clipperData->clipMaskImage->context();
     ASSERT(maskContext);
 
     AffineTransform maskContentTransformation;
-    SVGClipPathElement* clipPath = static_cast<SVGClipPathElement*>(node());
-    if (clipPath->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
+    if (toSVGClipPathElement(node())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
         maskContentTransformation.translate(objectBoundingBox.x(), objectBoundingBox.y());
         maskContentTransformation.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         maskContext->concatCTM(maskContentTransformation);
     }
 
     // Switch to a paint behavior where all children of this <clipPath> will be rendered using special constraints:
     // - fill-opacity/stroke-opacity/opacity set to 1
     // - masker/filter not applied when rendering the children
     // - fill is set to the initial fill paint server (solid, black)
     // - stroke is set to the initial stroke paint server (none)
@@ skipping 47 matching lines @@
         RenderObject* renderer = childNode->renderer();
         if (!childNode->isSVGElement() || !renderer)
             continue;
         if (!renderer->isSVGShape() && !renderer->isSVGText() && !childNode->hasTagName(SVGNames::useTag))
             continue;
         RenderStyle* style = renderer->style();
         if (!style || style->display() == NONE || style->visibility() != VISIBLE)
              continue;
         m_clipBoundaries.unite(renderer->localToParentTransform().mapRect(renderer->repaintRectInLocalCoordinates()));
     }
-    m_clipBoundaries = static_cast<SVGClipPathElement*>(node())->animatedLocalTransform().mapRect(m_clipBoundaries);
+    m_clipBoundaries = toSVGClipPathElement(node())->animatedLocalTransform().mapRect(m_clipBoundaries);
 }
 
 bool RenderSVGResourceClipper::hitTestClipContent(const FloatRect& objectBoundingBox, const FloatPoint& nodeAtPoint)
 {
     FloatPoint point = nodeAtPoint;
     if (!SVGRenderSupport::pointInClippingArea(this, point))
         return false;
 
-    SVGClipPathElement* clipPathElement = static_cast<SVGClipPathElement*>(node());
+    SVGClipPathElement* clipPathElement = toSVGClipPathElement(node());
     if (clipPathElement->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
         AffineTransform transform;
         transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
         transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         point = transform.inverse().mapPoint(point);
     }
 
     point = clipPathElement->animatedLocalTransform().inverse().mapPoint(point);
 
     for (Node* childNode = node()->firstChild(); childNode; childNode = childNode->nextSibling()) {
@@ skipping 13 matching lines @@
 
 FloatRect RenderSVGResourceClipper::resourceBoundingBox(RenderObject* object)
 {
     // Resource was not layouted yet. Give back the boundingBox of the object.
     if (selfNeedsLayout())
         return object->objectBoundingBox();
 
     if (m_clipBoundaries.isEmpty())
         calculateClipContentRepaintRect();
 
-    if (static_cast<SVGClipPathElement*>(node())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
+    if (toSVGClipPathElement(node())->clipPathUnitsCurrentValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
         FloatRect objectBoundingBox = object->objectBoundingBox();
         AffineTransform transform;
         transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
         transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         return transform.mapRect(m_clipBoundaries);
     }
 
     return m_clipBoundaries;
 }
 
 }