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/*
* Copyright (C) 2021 Apple 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
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ReferencedSVGResources.h"
#include "FilterOperations.h"
#include "PathOperation.h"
#include "RenderSVGResourceClipper.h"
#include "RenderSVGResourceFilter.h"
#include "RenderStyle.h"
#include "SVGClipPathElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGFilterElement.h"
#include "SVGResourceElementClient.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
class CSSSVGResourceElementClient final : public SVGResourceElementClient {
WTF_MAKE_ISO_ALLOCATED(CSSSVGResourceElementClient);
public:
CSSSVGResourceElementClient(RenderElement& clientRenderer)
: m_clientRenderer(clientRenderer)
{
}
void resourceChanged(SVGElement&) final;
private:
RenderElement& m_clientRenderer;
};
WTF_MAKE_ISO_ALLOCATED_IMPL(CSSSVGResourceElementClient);
void CSSSVGResourceElementClient::resourceChanged(SVGElement&)
{
if (!m_clientRenderer.renderTreeBeingDestroyed())
m_clientRenderer.repaint();
}
WTF_MAKE_ISO_ALLOCATED_IMPL(ReferencedSVGResources);
ReferencedSVGResources::ReferencedSVGResources(RenderElement& renderer)
: m_renderer(renderer)
{
}
ReferencedSVGResources::~ReferencedSVGResources()
{
auto& treeScope = m_renderer.treeScopeForSVGReferences();
for (auto& targetID : copyToVector(m_elementClients.keys()))
removeClientForTarget(treeScope, targetID);
}
void ReferencedSVGResources::addClientForTarget(SVGElement& targetElement, const AtomString& targetID)
{
m_elementClients.ensure(targetID, [&] {
auto client = makeUnique<CSSSVGResourceElementClient>(m_renderer);
targetElement.addReferencingCSSClient(*client);
return client;
});
}
void ReferencedSVGResources::removeClientForTarget(TreeScope& treeScope, const AtomString& targetID)
{
auto client = m_elementClients.take(targetID);
auto* targetElement = treeScope.getElementById(targetID);
if (auto* svgElement = dynamicDowncast<SVGElement>(targetElement))
svgElement->removeReferencingCSSClient(*client);
}
Vector<std::pair<AtomString, QualifiedName>> ReferencedSVGResources::referencedSVGResourceIDs(const RenderStyle& style)
{
Vector<std::pair<AtomString, QualifiedName>> referencedResources;
if (is<ReferencePathOperation>(style.clipPath())) {
auto& clipPath = downcast<ReferencePathOperation>(*style.clipPath());
if (!clipPath.fragment().isEmpty())
referencedResources.append({ clipPath.fragment(), SVGNames::clipPathTag });
}
if (style.hasFilter()) {
const auto& filterOperations = style.filter();
for (auto& operation : filterOperations.operations()) {
auto& filterOperation = *operation;
if (filterOperation.type() == FilterOperation::Type::Reference) {
const auto& referenceFilterOperation = downcast<ReferenceFilterOperation>(filterOperation);
if (!referenceFilterOperation.fragment().isEmpty())
referencedResources.append({ referenceFilterOperation.fragment(), SVGNames::filterTag });
}
}
}
return referencedResources;
}
void ReferencedSVGResources::updateReferencedResources(TreeScope& treeScope, const Vector<std::pair<AtomString, QualifiedName>>& referencedResources)
{
HashSet<AtomString> oldKeys;
for (auto& key : m_elementClients.keys())
oldKeys.add(key);
for (auto& [targetID, tagName] : referencedResources) {
auto* element = elementForResourceID(treeScope, targetID, tagName);
if (!element)
continue;
addClientForTarget(*element, targetID);
oldKeys.remove(targetID);
}
for (auto& targetID : oldKeys)
removeClientForTarget(treeScope, targetID);
}
// SVG code uses getRenderSVGResourceById<>, but that works in terms of renderers. We need to find resources
// before the render tree is fully constructed, so this works on Elements.
SVGElement* ReferencedSVGResources::elementForResourceID(TreeScope& treeScope, const AtomString& resourceID, const QualifiedName& tagName)
{
auto* element = treeScope.getElementById(resourceID);
if (!element || !element->hasTagName(tagName))
return nullptr;
return downcast<SVGElement>(element);
}
SVGFilterElement* ReferencedSVGResources::referencedFilterElement(TreeScope& treeScope, const ReferenceFilterOperation& referenceFilter)
{
if (referenceFilter.fragment().isEmpty())
return nullptr;
auto* element = elementForResourceID(treeScope, referenceFilter.fragment(), SVGNames::filterTag);
return element ? downcast<SVGFilterElement>(element) : nullptr;
}
RenderSVGResourceClipper* ReferencedSVGResources::referencedClipperRenderer(TreeScope& treeScope, const ReferencePathOperation& clipPath)
{
if (clipPath.fragment().isEmpty())
return nullptr;
// For some reason, SVG stores a cache of id -> renderer, rather than just using getElementById() and renderer().
return getRenderSVGResourceById<RenderSVGResourceClipper>(treeScope, clipPath.fragment());
}
} // namespace WebCore
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