Source/WebCore/svg/SVGClipPathElement.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) 2018 Apple Inc. 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.
 */

#include "config.h"
#include "SVGClipPathElement.h"

#include "Document.h"
#include "RenderSVGResourceClipper.h"
#include "SVGNames.h"
#include "StyleResolver.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(SVGClipPathElement);

inline SVGClipPathElement::SVGClipPathElement(const QualifiedName& tagName, Document& document)
    : SVGGraphicsElement(tagName, document)
    , SVGExternalResourcesRequired(this)
{
    ASSERT(hasTagName(SVGNames::clipPathTag));

    static std::once_flag onceFlag;
    std::call_once(onceFlag, [] {
        PropertyRegistry::registerProperty<SVGNames::clipPathUnitsAttr, SVGUnitTypes::SVGUnitType, &SVGClipPathElement::m_clipPathUnits>();
    });}

Ref<SVGClipPathElement> SVGClipPathElement::create(const QualifiedName& tagName, Document& document)
{
    return adoptRef(*new SVGClipPathElement(tagName, document));
}

void SVGClipPathElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
    if (name == SVGNames::clipPathUnitsAttr) {
        auto propertyValue = SVGPropertyTraits<SVGUnitTypes::SVGUnitType>::fromString(value);
        if (propertyValue > 0)
            m_clipPathUnits->setBaseValInternal<SVGUnitTypes::SVGUnitType>(propertyValue);
        return;
    }

    SVGGraphicsElement::parseAttribute(name, value);
    SVGExternalResourcesRequired::parseAttribute(name, value);
}

void SVGClipPathElement::svgAttributeChanged(const QualifiedName& attrName)
{
    if (PropertyRegistry::isKnownAttribute(attrName)) {
        InstanceInvalidationGuard guard(*this);

        if (RenderObject* object = renderer())
            object->setNeedsLayout();
        return;
    }

    SVGGraphicsElement::svgAttributeChanged(attrName);
    SVGExternalResourcesRequired::svgAttributeChanged(attrName);
}

void SVGClipPathElement::childrenChanged(const ChildChange& change)
{
    SVGGraphicsElement::childrenChanged(change);

    if (change.source == ChildChangeSource::Parser)
        return;

    if (RenderObject* object = renderer())
        object->setNeedsLayout();
}

RenderPtr<RenderElement> SVGClipPathElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
    return createRenderer<RenderSVGResourceClipper>(*this, WTFMove(style));
}

}