diff -r 000000000000 -r 4f2f89ce4247 WebCore/rendering/RenderSVGResourceContainer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/rendering/RenderSVGResourceContainer.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) Research In Motion Limited 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.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef RenderSVGResourceContainer_h
+#define RenderSVGResourceContainer_h
+
+#if ENABLE(SVG)
+#include "RenderSVGHiddenContainer.h"
+
+#include "SVGStyledTransformableElement.h"
+#include "RenderSVGResource.h"
+#include "RenderSVGShadowTreeRootContainer.h"
+
+namespace WebCore {
+
+class RenderSVGResourceContainer : public RenderSVGHiddenContainer,
+                                   public RenderSVGResource {
+public:
+    RenderSVGResourceContainer(SVGStyledElement* node)
+        : RenderSVGHiddenContainer(node)
+        , RenderSVGResource()
+        , m_id(node->hasID() ? node->getIdAttribute() : nullAtom)
+    {
+        ASSERT(node->document());
+        node->document()->accessSVGExtensions()->addResource(m_id, this);
+    }
+
+    virtual ~RenderSVGResourceContainer()
+    {
+        ASSERT(node());
+        ASSERT(node()->document());
+        node()->document()->accessSVGExtensions()->removeResource(m_id);
+    }
+
+    void idChanged()
+    {
+        ASSERT(node());
+        ASSERT(node()->document());
+        SVGDocumentExtensions* extensions = node()->document()->accessSVGExtensions();
+
+        // Remove old id, that is guaranteed to be present in cache
+        extensions->removeResource(m_id);
+        m_id = static_cast<Element*>(node())->getIdAttribute();
+
+        // It's possible that an element is referencing us with the new id, and has to be notified that we're existing now
+        if (extensions->isPendingResource(m_id)) {
+            OwnPtr<HashSet<SVGStyledElement*> > clients(extensions->removePendingResource(m_id));
+            if (clients->isEmpty())
+                return;
+
+            HashSet<SVGStyledElement*>::const_iterator it = clients->begin();
+            const HashSet<SVGStyledElement*>::const_iterator end = clients->end();
+
+            for (; it != end; ++it) {
+                if (RenderObject* renderer = (*it)->renderer())
+                    renderer->setNeedsLayout(true);
+            }
+        }
+
+        // Recache us with the new id
+        extensions->addResource(m_id, this);
+    }
+
+    virtual bool isSVGResourceContainer() const { return true; }
+    virtual bool drawsContents() { return false; }
+
+    virtual RenderSVGResourceContainer* toRenderSVGResourceContainer() { return this; }
+    virtual bool childElementReferencesResource(const SVGRenderStyle*, const String&) const { return false; }
+
+    static AffineTransform transformOnNonScalingStroke(RenderObject* object, const AffineTransform resourceTransform)
+    {
+        if (!object->isRenderPath())
+            return resourceTransform;
+
+        SVGStyledTransformableElement* element = static_cast<SVGStyledTransformableElement*>(object->node());
+        AffineTransform transform = resourceTransform;
+        transform.multiply(element->getScreenCTM());
+        return transform;
+    }
+
+    bool containsCyclicReference(const Node* startNode) const
+    {
+        ASSERT(startNode->document());
+    
+        for (Node* node = startNode->firstChild(); node; node = node->nextSibling()) {
+            if (!node->isSVGElement())
+                continue;
+    
+            RenderObject* renderer = node->renderer();
+            if (!renderer)
+                continue;
+    
+            RenderStyle* style = renderer->style();
+            if (!style)
+                continue;
+    
+            const SVGRenderStyle* svgStyle = style->svgStyle();
+            ASSERT(svgStyle);
+    
+            // Let the class inheriting from us decide whether the child element references ourselves.
+            if (childElementReferencesResource(svgStyle, m_id))
+                return true;
+
+            // Dive into shadow tree to check for cycles there.
+            if (node->hasTagName(SVGNames::useTag)) {
+                ASSERT(renderer->isSVGShadowTreeRootContainer());
+                if (Node* shadowRoot = static_cast<RenderSVGShadowTreeRootContainer*>(renderer)->rootElement()) {
+                    if (containsCyclicReference(shadowRoot))
+                        return true;
+                }
+
+            }
+
+            if (node->hasChildNodes()) {
+                if (containsCyclicReference(node))
+                    return true;
+            }
+        }
+    
+        return false;
+    }
+
+private:
+    AtomicString m_id;
+};
+
+inline RenderSVGResourceContainer* getRenderSVGResourceContainerById(Document* document, const AtomicString& id)
+{
+    if (id.isEmpty())
+        return 0;
+
+    if (RenderSVGResourceContainer* renderResource = document->accessSVGExtensions()->resourceById(id))
+        return renderResource;
+
+    return 0;
+}
+
+template<typename Renderer>
+Renderer* getRenderSVGResourceById(Document* document, const AtomicString& id)
+{
+    if (RenderSVGResourceContainer* container = getRenderSVGResourceContainerById(document, id))
+        return container->cast<Renderer>();
+
+    return 0;
+}
+
+}
+
+#endif
+#endif