third_party/WebKit/Source/core/svg/SVGFilterElement.cpp

/*
 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
 * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
 * 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.
 */

#include "core/svg/SVGFilterElement.h"

#include "core/frame/UseCounter.h"
#include "core/layout/svg/LayoutSVGResourceFilter.h"
#include "core/svg/SVGResourceClient.h"

namespace blink {

inline SVGFilterElement::SVGFilterElement(Document& document)
    : SVGElement(SVGNames::filterTag, document)
    , SVGURIReference(this)
    , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width)))
    , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height)))
    , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(SVGLengthMode::Width)))
    , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(SVGLengthMode::Height)))
    , m_filterUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::filterUnitsAttr, SVGUnitTypes::kSvgUnitTypeObjectboundingbox))
    , m_primitiveUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::primitiveUnitsAttr, SVGUnitTypes::kSvgUnitTypeUserspaceonuse))
{
    // Spec: If the x/y attribute is not specified, the effect is as if a value of "-10%" were specified.
    // Spec: If the width/height attribute is not specified, the effect is as if a value of "120%" were specified.
    m_x->setDefaultValueAsString("-10%");
    m_y->setDefaultValueAsString("-10%");
    m_width->setDefaultValueAsString("120%");
    m_height->setDefaultValueAsString("120%");

    addToPropertyMap(m_x);
    addToPropertyMap(m_y);
    addToPropertyMap(m_width);
    addToPropertyMap(m_height);
    addToPropertyMap(m_filterUnits);
    addToPropertyMap(m_primitiveUnits);
}

SVGFilterElement::~SVGFilterElement()
{
}

DEFINE_NODE_FACTORY(SVGFilterElement)

DEFINE_TRACE(SVGFilterElement)
{
    visitor->trace(m_x);
    visitor->trace(m_y);
    visitor->trace(m_width);
    visitor->trace(m_height);
    visitor->trace(m_filterUnits);
    visitor->trace(m_primitiveUnits);
    visitor->trace(m_clientsToAdd);
    SVGElement::trace(visitor);
    SVGURIReference::trace(visitor);
}

void SVGFilterElement::svgAttributeChanged(const QualifiedName& attrName)
{
    bool isXYWH = attrName == SVGNames::xAttr
        || attrName == SVGNames::yAttr
        || attrName == SVGNames::widthAttr
        || attrName == SVGNames::heightAttr;
    if (isXYWH)
        updateRelativeLengthsInformation();

    if (isXYWH
        || attrName == SVGNames::filterUnitsAttr
        || attrName == SVGNames::primitiveUnitsAttr) {
        SVGElement::InvalidationGuard invalidationGuard(this);
        LayoutSVGResourceContainer* layoutObject = toLayoutSVGResourceContainer(this->layoutObject());
        if (layoutObject)
            layoutObject->invalidateCacheAndMarkForLayout();

        return;
    }

    SVGElement::svgAttributeChanged(attrName);
}

void SVGFilterElement::childrenChanged(const ChildrenChange& change)
{
    SVGElement::childrenChanged(change);

    if (change.byParser)
        return;

    if (LayoutObject* object = layoutObject())
        object->setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::ChildChanged);
}

LayoutObject* SVGFilterElement::createLayoutObject(const ComputedStyle&)
{
    LayoutSVGResourceFilter* layoutObject = new LayoutSVGResourceFilter(this);

    for (SVGResourceClient* client : m_clientsToAdd)
        layoutObject->addResourceClient(client);
    m_clientsToAdd.clear();

    return layoutObject;
}

bool SVGFilterElement::selfHasRelativeLengths() const
{
    return m_x->currentValue()->isRelative()
        || m_y->currentValue()->isRelative()
        || m_width->currentValue()->isRelative()
        || m_height->currentValue()->isRelative();
}

void SVGFilterElement::addClient(SVGResourceClient* client)
{
    ASSERT(client);
    m_clientsToAdd.add(client);
}

void SVGFilterElement::removeClient(SVGResourceClient* client)
{
    ASSERT(client);
    m_clientsToAdd.remove(client);
}

} // namespace blink