Source/WebCore/svg/SVGGeometryElement.cpp

/*
 * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
 * Copyright (C) 2018 Apple Inc. All rights reserved.
 * Copyright (C) 2018 Adobe Systems Incorporated. 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 "SVGGeometryElement.h"

#include "DOMPoint.h"
#include "RenderSVGPath.h"
#include "RenderSVGResource.h"
#include "SVGDocumentExtensions.h"
#include "SVGMPathElement.h"
#include "SVGNames.h"
#include "SVGPathUtilities.h"
#include "SVGPoint.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(SVGGeometryElement);

// Animated property definitions
DEFINE_ANIMATED_NUMBER(SVGGeometryElement, SVGNames::pathLengthAttr, PathLength, pathLength)

BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGGeometryElement)
    REGISTER_LOCAL_ANIMATED_PROPERTY(pathLength)
    REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGraphicsElement)
END_REGISTER_ANIMATED_PROPERTIES

SVGGeometryElement::SVGGeometryElement(const QualifiedName& tagName, Document& document)
    : SVGGraphicsElement(tagName, document)
{
    registerAnimatedPropertiesForSVGGeometryElement();
}

float SVGGeometryElement::getTotalLength() const
{
    document().updateLayoutIgnorePendingStylesheets();

    auto* renderer = downcast<RenderSVGShape>(this->renderer());
    if (!renderer)
        return 0;

    return renderer->getTotalLength();
}

Ref<SVGPoint> SVGGeometryElement::getPointAtLength(float distance) const
{
    FloatPoint point { };

    document().updateLayoutIgnorePendingStylesheets();

    auto* renderer = downcast<RenderSVGShape>(this->renderer());
    if (renderer)
        renderer->getPointAtLength(point, distance);

    return SVGPoint::create(point);
}

bool SVGGeometryElement::isPointInFill(DOMPointInit&& pointInit)
{
    document().updateLayoutIgnorePendingStylesheets();

    auto* renderer = downcast<RenderSVGShape>(this->renderer());
    if (!renderer)
        return false;

    FloatPoint point {static_cast<float>(pointInit.x), static_cast<float>(pointInit.y)};
    return renderer->isPointInFill(point);
}

bool SVGGeometryElement::isPointInStroke(DOMPointInit&& pointInit)
{
    document().updateLayoutIgnorePendingStylesheets();

    auto* renderer = downcast<RenderSVGShape>(this->renderer());
    if (!renderer)
        return false;

    FloatPoint point {static_cast<float>(pointInit.x), static_cast<float>(pointInit.y)};
    return renderer->isPointInStroke(point);
}

bool SVGGeometryElement::isSupportedAttribute(const QualifiedName& attrName)
{
    static const auto supportedAttributes = makeNeverDestroyed([] {
        HashSet<QualifiedName> set;
        SVGLangSpace::addSupportedAttributes(set);
        SVGExternalResourcesRequired::addSupportedAttributes(set);
        set.add({ SVGNames::pathLengthAttr.get() });
        return set;
    }());
    return supportedAttributes.get().contains<SVGAttributeHashTranslator>(attrName);
}

void SVGGeometryElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    if (name == SVGNames::pathLengthAttr) {
        setPathLengthBaseValue(value.toFloat());
        if (pathLengthBaseValue() < 0)
            document().accessSVGExtensions().reportError("A negative value for path attribute <pathLength> is not allowed");
        return;
    }

    SVGGraphicsElement::parseAttribute(name, value);
}

void SVGGeometryElement::svgAttributeChanged(const QualifiedName& attrName)
{
    if (!isSupportedAttribute(attrName)) {
        SVGGraphicsElement::svgAttributeChanged(attrName);
        return;
    }

    InstanceInvalidationGuard guard(*this);

    ASSERT_NOT_REACHED();
}

}