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/*
* 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 "ImageBuffer.h"
#include "LegacyRenderSVGResourceClipper.h"
#include "RenderElementInlines.h"
#include "RenderSVGResourceClipper.h"
#include "RenderSVGText.h"
#include "RenderStyleInlines.h"
#include "SVGElementInlines.h"
#include "SVGElementTypeHelpers.h"
#include "SVGLayerTransformComputation.h"
#include "SVGNames.h"
#include "SVGUseElement.h"
#include "StyleResolver.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(SVGClipPathElement);
inline SVGClipPathElement::SVGClipPathElement(const QualifiedName& tagName, Document& document)
: SVGGraphicsElement(tagName, document, makeUniqueRef<PropertyRegistry>(*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::attributeChanged(const QualifiedName& name, const AtomString& oldValue, const AtomString& newValue, AttributeModificationReason attributeModificationReason)
{
if (name == SVGNames::clipPathUnitsAttr) {
auto propertyValue = SVGPropertyTraits<SVGUnitTypes::SVGUnitType>::fromString(newValue);
if (propertyValue > 0)
m_clipPathUnits->setBaseValInternal<SVGUnitTypes::SVGUnitType>(propertyValue);
}
SVGGraphicsElement::attributeChanged(name, oldValue, newValue, attributeModificationReason);
}
void SVGClipPathElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (PropertyRegistry::isKnownAttribute(attrName)) {
InstanceInvalidationGuard guard(*this);
if (document().settings().layerBasedSVGEngineEnabled()) {
if (CheckedPtr renderer = this->renderer())
renderer->repaintClientsOfReferencedSVGResources();
return;
}
updateSVGRendererForElementChange();
return;
}
SVGGraphicsElement::svgAttributeChanged(attrName);
}
void SVGClipPathElement::childrenChanged(const ChildChange& change)
{
SVGGraphicsElement::childrenChanged(change);
if (change.source == ChildChange::Source::Parser)
return;
if (document().settings().layerBasedSVGEngineEnabled()) {
if (CheckedPtr renderer = this->renderer())
renderer->repaintClientsOfReferencedSVGResources();
return;
}
updateSVGRendererForElementChange();
}
RenderPtr<RenderElement> SVGClipPathElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
if (document().settings().layerBasedSVGEngineEnabled())
return createRenderer<RenderSVGResourceClipper>(*this, WTFMove(style));
return createRenderer<LegacyRenderSVGResourceClipper>(*this, WTFMove(style));
}
RefPtr<SVGGraphicsElement> SVGClipPathElement::shouldApplyPathClipping() const
{
// If the current clip-path gets clipped itself, we have to fall back to masking.
if (renderer() && renderer()->style().clipPath())
return nullptr;
auto rendererRequiresMaskClipping = [](const RenderObject& renderer) -> bool {
// Only shapes or paths are supported for direct clipping. We need to fall back to masking for texts.
if (is<RenderSVGText>(renderer))
return true;
auto& style = renderer.style();
if (style.display() == DisplayType::None || style.usedVisibility() != Visibility::Visible)
return false;
// Current shape in clip-path gets clipped too. Fall back to masking.
return style.clipPath();
};
RefPtr<SVGGraphicsElement> useGraphicsElement;
// If clip-path only contains one visible shape or path, we can use path-based clipping. Invisible
// shapes don't affect the clipping and can be ignored. If clip-path contains more than one
// visible shape, the additive clipping may not work, caused by the clipRule. EvenOdd
// as well as NonZero can cause self-clipping of the elements.
// See also http://www.w3.org/TR/SVG/painting.html#FillRuleProperty
for (auto* childNode = firstChild(); childNode; childNode = childNode->nextSibling()) {
RefPtr graphicsElement = dynamicDowncast<SVGGraphicsElement>(*childNode);
if (!graphicsElement)
continue;
CheckedPtr renderer = graphicsElement->renderer();
if (!renderer)
continue;
if (rendererRequiresMaskClipping(*renderer))
return nullptr;
// Fallback to masking, if there is more than one clipping path.
if (useGraphicsElement)
return nullptr;
// For <use> elements, delegate the decision whether to use mask clipping or not to the referenced element.
if (auto* useElement = dynamicDowncast<SVGUseElement>(*graphicsElement)) {
CheckedPtr clipChildRenderer = useElement->rendererClipChild();
if (clipChildRenderer && rendererRequiresMaskClipping(*clipChildRenderer))
return nullptr;
}
useGraphicsElement = WTFMove(graphicsElement);
}
return useGraphicsElement;
}
FloatRect SVGClipPathElement::calculateClipContentRepaintRect(RepaintRectCalculation repaintRectCalculation)
{
ASSERT(renderer());
auto transformationMatrixFromChild = [&](const RenderLayerModelObject& child) -> std::optional<AffineTransform> {
if (!document().settings().layerBasedSVGEngineEnabled())
return std::nullopt;
if (!(renderer()->isTransformed() || child.isTransformed()) || !child.hasLayer())
return std::nullopt;
ASSERT(child.isSVGLayerAwareRenderer());
ASSERT(!child.isRenderSVGRoot());
auto transform = SVGLayerTransformComputation(child).computeAccumulatedTransform(downcast<RenderLayerModelObject>(renderer()), TransformState::TrackSVGCTMMatrix);
return transform.isIdentity() ? std::nullopt : std::make_optional(WTFMove(transform));
};
FloatRect clipContentRepaintRect;
// This is a rough heuristic to appraise the clip size and doesn't consider clip on clip.
for (auto* childNode = firstChild(); childNode; childNode = childNode->nextSibling()) {
CheckedPtr renderer = childNode->renderer();
if (!childNode->isSVGElement() || !renderer)
continue;
if (!renderer->isRenderSVGShape() && !renderer->isRenderSVGText() && !childNode->hasTagName(SVGNames::useTag))
continue;
auto& style = renderer->style();
if (style.display() == DisplayType::None || style.usedVisibility() != Visibility::Visible)
continue;
auto r = renderer->repaintRectInLocalCoordinates(repaintRectCalculation);
if (auto transform = transformationMatrixFromChild(downcast<RenderLayerModelObject>(*renderer)))
r = transform->mapRect(r);
clipContentRepaintRect.unite(r);
}
return clipContentRepaintRect;
}
}
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