Source/WebCore/svg/SVGGElement.cpp

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

#include "LegacyRenderSVGTransformableContainer.h"
#include "RenderSVGHiddenContainer.h"
#include "RenderSVGResource.h"
#include "RenderSVGTransformableContainer.h"
#include "SVGNames.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(SVGGElement);

SVGGElement::SVGGElement(const QualifiedName& tagName, Document& document)
    : SVGGraphicsElement(tagName, document)
{
    ASSERT(hasTagName(SVGNames::gTag));
}

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

Ref<SVGGElement> SVGGElement::create(Document& document)
{
    return create(SVGNames::gTag, document);
}

RenderPtr<RenderElement> SVGGElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
#if ENABLE(LAYER_BASED_SVG_ENGINE)
    // FIXME: [LBSE] Support hidden containers
    if (document().settings().layerBasedSVGEngineEnabled())
        return createRenderer<RenderSVGTransformableContainer>(*this, WTFMove(style));
#endif

    // SVG 1.1 testsuite explicitly uses constructs like <g display="none"><linearGradient>
    // We still have to create renderers for the <g> & <linearGradient> element, though the
    // subtree may be hidden - we only want the resource renderers to exist so they can be
    // referenced from somewhere else.
    if (style.display() == DisplayType::None)
        return createRenderer<RenderSVGHiddenContainer>(*this, WTFMove(style));

    return createRenderer<LegacyRenderSVGTransformableContainer>(*this, WTFMove(style));
}

bool SVGGElement::rendererIsNeeded(const RenderStyle&)
{
    // Unlike SVGElement::rendererIsNeeded(), we still create renderers, even if
    // display is set to 'none' - which is special to SVG <g> container elements.
    return parentOrShadowHostElement() && parentOrShadowHostElement()->isSVGElement();
}

}