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/*
* Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008 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 "config.h"
#include "core/svg/SVGLinearGradientElement.h"
#include "core/layout/svg/LayoutSVGResourceLinearGradient.h"
#include "core/svg/LinearGradientAttributes.h"
#include "core/svg/SVGLength.h"
namespace blink {
inline SVGLinearGradientElement::SVGLinearGradientElement(Document& document)
: SVGGradientElement(SVGNames::linearGradientTag, document)
, m_x1(SVGAnimatedLength::create(this, SVGNames::x1Attr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
, m_y1(SVGAnimatedLength::create(this, SVGNames::y1Attr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
, m_x2(SVGAnimatedLength::create(this, SVGNames::x2Attr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
, m_y2(SVGAnimatedLength::create(this, SVGNames::y2Attr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
{
// Spec: If the x1|y1|y2 attribute is not specified, the effect is as if a value of "0%" were specified.
m_x1->setDefaultValueAsString("0%");
m_y1->setDefaultValueAsString("0%");
m_y2->setDefaultValueAsString("0%");
// Spec: If the x2 attribute is not specified, the effect is as if a value of "100%" were specified.
m_x2->setDefaultValueAsString("100%");
addToPropertyMap(m_x1);
addToPropertyMap(m_y1);
addToPropertyMap(m_x2);
addToPropertyMap(m_y2);
}
DEFINE_TRACE(SVGLinearGradientElement)
{
visitor->trace(m_x1);
visitor->trace(m_y1);
visitor->trace(m_x2);
visitor->trace(m_y2);
SVGGradientElement::trace(visitor);
}
DEFINE_NODE_FACTORY(SVGLinearGradientElement)
void SVGLinearGradientElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (attrName == SVGNames::x1Attr || attrName == SVGNames::x2Attr
|| attrName == SVGNames::y1Attr || attrName == SVGNames::y2Attr) {
SVGElement::InvalidationGuard invalidationGuard(this);
updateRelativeLengthsInformation();
LayoutSVGResourceContainer* layoutObject = toLayoutSVGResourceContainer(this->layoutObject());
if (layoutObject)
layoutObject->invalidateCacheAndMarkForLayout();
return;
}
SVGGradientElement::svgAttributeChanged(attrName);
}
LayoutObject* SVGLinearGradientElement::createLayoutObject(const ComputedStyle&)
{
return new LayoutSVGResourceLinearGradient(this);
}
static void setGradientAttributes(SVGGradientElement* element, LinearGradientAttributes& attributes, bool isLinear = true)
{
if (!attributes.hasSpreadMethod() && element->spreadMethod()->isSpecified())
attributes.setSpreadMethod(element->spreadMethod()->currentValue()->enumValue());
if (!attributes.hasGradientUnits() && element->gradientUnits()->isSpecified())
attributes.setGradientUnits(element->gradientUnits()->currentValue()->enumValue());
if (!attributes.hasGradientTransform() && element->gradientTransform()->isSpecified()) {
AffineTransform transform;
element->gradientTransform()->currentValue()->concatenate(transform);
attributes.setGradientTransform(transform);
}
if (!attributes.hasStops()) {
const Vector<Gradient::ColorStop>& stops(element->buildStops());
if (!stops.isEmpty())
attributes.setStops(stops);
}
if (isLinear) {
SVGLinearGradientElement* linear = toSVGLinearGradientElement(element);
if (!attributes.hasX1() && linear->x1()->isSpecified())
attributes.setX1(linear->x1()->currentValue());
if (!attributes.hasY1() && linear->y1()->isSpecified())
attributes.setY1(linear->y1()->currentValue());
if (!attributes.hasX2() && linear->x2()->isSpecified())
attributes.setX2(linear->x2()->currentValue());
if (!attributes.hasY2() && linear->y2()->isSpecified())
attributes.setY2(linear->y2()->currentValue());
}
}
bool SVGLinearGradientElement::collectGradientAttributes(LinearGradientAttributes& attributes)
{
if (!layoutObject())
return false;
WillBeHeapHashSet<RawPtrWillBeMember<SVGGradientElement>> processedGradients;
SVGGradientElement* current = this;
setGradientAttributes(current, attributes);
processedGradients.add(current);
while (true) {
// Respect xlink:href, take attributes from referenced element
Node* refNode = SVGURIReference::targetElementFromIRIString(current->href()->currentValue()->value(), treeScope());
if (refNode && isSVGGradientElement(*refNode)) {
current = toSVGGradientElement(refNode);
// Cycle detection
if (processedGradients.contains(current))
return true;
if (!current->layoutObject())
return false;
setGradientAttributes(current, attributes, isSVGLinearGradientElement(*current));
processedGradients.add(current);
} else {
return true;
}
}
ASSERT_NOT_REACHED();
return false;
}
bool SVGLinearGradientElement::selfHasRelativeLengths() const
{
return m_x1->currentValue()->isRelative()
|| m_y1->currentValue()->isRelative()
|| m_x2->currentValue()->isRelative()
|| m_y2->currentValue()->isRelative();
}
} // namespace blink