[RAL] Reduce SVG tree walks

Source/core/rendering/svg/SVGRenderSupport.cpp

 /*
  * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.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
@@ skipping 76 matching lines @@
     if (parent->isSVGRoot()) {
         TransformationMatrix matrix(object->localToParentTransform());
         matrix.multiply(toRenderSVGRoot(parent)->localToBorderBoxTransform());
         geometryMap.push(object, matrix);
     } else
         geometryMap.push(object, object->localToParentTransform());
 
     return parent;
 }
 
+bool SVGRenderSupport::parentTransformDidChange(RenderObject* object)
+{
+    // When a parent container is transformed in SVG, all children will be painted automatically
+    // so we are able to skip redundant repaint checks.
+    RenderObject* parent = object->parent();
+    return !(parent && parent->isSVGContainer() && toRenderSVGContainer(parent)->didTransformToRootUpdate());
+}
+
 bool SVGRenderSupport::checkForSVGRepaintDuringLayout(RenderObject* object)
 {
     if (!object->checkForRepaintDuringLayout())
         return false;
-    // When a parent container is transformed in SVG, all children will be painted automatically
-    // so we are able to skip redundant repaint checks.
-    RenderObject* parent = object->parent();
-    return !(parent && parent->isSVGContainer() && toRenderSVGContainer(parent)->didTransformToRootUpdate());
+
+    return parentTransformDidChange(object);
 }
 
 bool SVGRenderSupport::paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo& paintInfo)
 {
     return localTransform.mapRect(localRepaintRect).intersects(paintInfo.rect);
 }
 
 const RenderSVGRoot* SVGRenderSupport::findTreeRootObject(const RenderObject* start)
 {
     while (start && !start->isSVGRoot())
@@ skipping 142 matching lines @@
 }
 
 bool SVGRenderSupport::isRenderableTextNode(const RenderObject* object)
 {
     ASSERT(object->isText());
     // <br> is marked as text, but is not handled by the SVG rendering code-path.
     return object->isSVGInlineText() && !toRenderSVGInlineText(object)->hasEmptyText();
 }
 
 }