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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 "third_party/blink/renderer/core/svg/svg_linear_gradient_element.h"
#include "third_party/blink/renderer/core/layout/svg/layout_svg_resource_linear_gradient.h"
#include "third_party/blink/renderer/core/svg/linear_gradient_attributes.h"
#include "third_party/blink/renderer/core/svg/svg_animated_length.h"
#include "third_party/blink/renderer/core/svg/svg_length.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
namespace blink {
SVGLinearGradientElement::SVGLinearGradientElement(Document& document)
: SVGGradientElement(svg_names::kLinearGradientTag, document),
// Spec: If the x1|y1|y2 attribute is not specified, the effect is as if a
// value of "0%" were specified.
// Spec: If the x2 attribute is not specified, the effect is as if a value
// of "100%" were specified.
x1_(MakeGarbageCollected<SVGAnimatedLength>(
this,
svg_names::kX1Attr,
SVGLengthMode::kWidth,
SVGLength::Initial::kPercent0)),
y1_(MakeGarbageCollected<SVGAnimatedLength>(
this,
svg_names::kY1Attr,
SVGLengthMode::kHeight,
SVGLength::Initial::kPercent0)),
x2_(MakeGarbageCollected<SVGAnimatedLength>(
this,
svg_names::kX2Attr,
SVGLengthMode::kWidth,
SVGLength::Initial::kPercent100)),
y2_(MakeGarbageCollected<SVGAnimatedLength>(
this,
svg_names::kY2Attr,
SVGLengthMode::kHeight,
SVGLength::Initial::kPercent0)) {
AddToPropertyMap(x1_);
AddToPropertyMap(y1_);
AddToPropertyMap(x2_);
AddToPropertyMap(y2_);
}
void SVGLinearGradientElement::Trace(Visitor* visitor) const {
visitor->Trace(x1_);
visitor->Trace(y1_);
visitor->Trace(x2_);
visitor->Trace(y2_);
SVGGradientElement::Trace(visitor);
}
void SVGLinearGradientElement::SvgAttributeChanged(
const QualifiedName& attr_name) {
if (attr_name == svg_names::kX1Attr || attr_name == svg_names::kX2Attr ||
attr_name == svg_names::kY1Attr || attr_name == svg_names::kY2Attr) {
SVGElement::InvalidationGuard invalidation_guard(this);
UpdateRelativeLengthsInformation();
InvalidateGradient(layout_invalidation_reason::kAttributeChanged);
return;
}
SVGGradientElement::SvgAttributeChanged(attr_name);
}
LayoutObject* SVGLinearGradientElement::CreateLayoutObject(const ComputedStyle&,
LegacyLayout) {
return new LayoutSVGResourceLinearGradient(this);
}
static void SetGradientAttributes(const SVGGradientElement& element,
LinearGradientAttributes& attributes,
bool is_linear) {
element.CollectCommonAttributes(attributes);
if (!is_linear)
return;
const auto& linear = To<SVGLinearGradientElement>(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());
}
void SVGLinearGradientElement::CollectGradientAttributes(
LinearGradientAttributes& attributes) const {
DCHECK(GetLayoutObject());
VisitedSet visited;
const SVGGradientElement* current = this;
while (true) {
SetGradientAttributes(*current, attributes,
IsA<SVGLinearGradientElement>(*current));
visited.insert(current);
current = current->ReferencedElement();
// Ignore the referenced gradient element if it is not attached.
if (!current || !current->GetLayoutObject())
break;
// Cycle detection.
if (visited.Contains(current))
break;
}
}
bool SVGLinearGradientElement::SelfHasRelativeLengths() const {
return x1_->CurrentValue()->IsRelative() ||
y1_->CurrentValue()->IsRelative() ||
x2_->CurrentValue()->IsRelative() || y2_->CurrentValue()->IsRelative();
}
} // namespace blink
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