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/*
* 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
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