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

/*
 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.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/SVGPatternElement.h"

#include "core/XLinkNames.h"
#include "core/dom/ElementTraversal.h"
#include "core/layout/svg/LayoutSVGResourcePattern.h"
#include "core/svg/PatternAttributes.h"
#include "platform/transforms/AffineTransform.h"

namespace blink {

inline SVGPatternElement::SVGPatternElement(Document& document)
    : SVGElement(SVGNames::patternTag, document)
    , SVGURIReference(this)
    , SVGTests(this)
    , SVGFitToViewBox(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_patternTransform(SVGAnimatedTransformList::create(this, SVGNames::patternTransformAttr, SVGTransformList::create()))
    , m_patternUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX))
    , m_patternContentUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternContentUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE))
{
    addToPropertyMap(m_x);
    addToPropertyMap(m_y);
    addToPropertyMap(m_width);
    addToPropertyMap(m_height);
    addToPropertyMap(m_patternTransform);
    addToPropertyMap(m_patternUnits);
    addToPropertyMap(m_patternContentUnits);
}

DEFINE_TRACE(SVGPatternElement)
{
    visitor->trace(m_x);
    visitor->trace(m_y);
    visitor->trace(m_width);
    visitor->trace(m_height);
    visitor->trace(m_patternTransform);
    visitor->trace(m_patternUnits);
    visitor->trace(m_patternContentUnits);
    SVGElement::trace(visitor);
    SVGURIReference::trace(visitor);
    SVGTests::trace(visitor);
    SVGFitToViewBox::trace(visitor);
}

DEFINE_NODE_FACTORY(SVGPatternElement)

void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName)
{
    bool isLengthAttr = attrName == SVGNames::xAttr
        || attrName == SVGNames::yAttr
        || attrName == SVGNames::widthAttr
        || attrName == SVGNames::heightAttr;

    if (isLengthAttr
        || attrName == SVGNames::patternUnitsAttr
        || attrName == SVGNames::patternContentUnitsAttr
        || attrName == SVGNames::patternTransformAttr
        || SVGFitToViewBox::isKnownAttribute(attrName)
        || SVGURIReference::isKnownAttribute(attrName)
        || SVGTests::isKnownAttribute(attrName)) {
        SVGElement::InvalidationGuard invalidationGuard(this);

        if (isLengthAttr)
            updateRelativeLengthsInformation();

        LayoutSVGResourceContainer* layoutObject = toLayoutSVGResourceContainer(this->layoutObject());
        if (layoutObject)
            layoutObject->invalidateCacheAndMarkForLayout();

        return;
    }

    SVGElement::svgAttributeChanged(attrName);
}

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

    if (change.byParser)
        return;

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

LayoutObject* SVGPatternElement::createLayoutObject(const ComputedStyle&)
{
    return new LayoutSVGResourcePattern(this);
}

static void setPatternAttributes(const SVGPatternElement* element, PatternAttributes& attributes)
{
    if (!attributes.hasX() && element->x()->isSpecified())
        attributes.setX(element->x()->currentValue());

    if (!attributes.hasY() && element->y()->isSpecified())
        attributes.setY(element->y()->currentValue());

    if (!attributes.hasWidth() && element->width()->isSpecified())
        attributes.setWidth(element->width()->currentValue());

    if (!attributes.hasHeight() && element->height()->isSpecified())
        attributes.setHeight(element->height()->currentValue());

    if (!attributes.hasViewBox() && element->viewBox()->isSpecified() && element->viewBox()->currentValue()->isValid())
        attributes.setViewBox(element->viewBox()->currentValue()->value());

    if (!attributes.hasPreserveAspectRatio() && element->preserveAspectRatio()->isSpecified())
        attributes.setPreserveAspectRatio(element->preserveAspectRatio()->currentValue());

    if (!attributes.hasPatternUnits() && element->patternUnits()->isSpecified())
        attributes.setPatternUnits(element->patternUnits()->currentValue()->enumValue());

    if (!attributes.hasPatternContentUnits() && element->patternContentUnits()->isSpecified())
        attributes.setPatternContentUnits(element->patternContentUnits()->currentValue()->enumValue());

    if (!attributes.hasPatternTransform() && element->patternTransform()->isSpecified()) {
        AffineTransform transform;
        element->patternTransform()->currentValue()->concatenate(transform);
        attributes.setPatternTransform(transform);
    }

    if (!attributes.hasPatternContentElement() && ElementTraversal::firstWithin(*element))
        attributes.setPatternContentElement(element);
}

void SVGPatternElement::collectPatternAttributes(PatternAttributes& attributes) const
{
    WillBeHeapHashSet<RawPtrWillBeMember<const SVGPatternElement>> processedPatterns;
    const SVGPatternElement* current = this;

    while (true) {
        setPatternAttributes(current, attributes);
        processedPatterns.add(current);

        // Respect xlink:href, take attributes from referenced element
        Node* refNode = SVGURIReference::targetElementFromIRIString(current->hrefString(), treeScope());

        // Only consider attached SVG pattern elements.
        if (!isSVGPatternElement(refNode) || !refNode->layoutObject())
            break;

        current = toSVGPatternElement(refNode);

        // Cycle detection
        if (processedPatterns.contains(current))
            break;
    }
}

AffineTransform SVGPatternElement::localCoordinateSpaceTransform(SVGElement::CTMScope) const
{
    AffineTransform matrix;
    m_patternTransform->currentValue()->concatenate(matrix);
    return matrix;
}

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

} // namespace blink