third_party/WebKit/Source/core/svg/SVGStopElement.cpp

   1 /*
   2  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public License
  16  * along with this library; see the file COPYING.LIB.  If not, write to
  17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  * Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include "config.h"
  22 #include "core/svg/SVGStopElement.h"
  23
  24 #include "core/layout/svg/LayoutSVGGradientStop.h"
  25
  26 namespace blink {
  27
  28 inline SVGStopElement::SVGStopElement(Document& document)
  29     : SVGElement(SVGNames::stopTag, document)
  30     , m_offset(SVGAnimatedNumber::create(this, SVGNames::offsetAttr, SVGNumberAcceptPercentage::create()))
  31 {
  32     addToPropertyMap(m_offset);
  33 }
  34
  35 DEFINE_TRACE(SVGStopElement)
  36 {
  37     visitor->trace(m_offset);
  38     SVGElement::trace(visitor);
  39 }
  40
  41 DEFINE_NODE_FACTORY(SVGStopElement)
  42
  43 void SVGStopElement::svgAttributeChanged(const QualifiedName& attrName)
  44 {
  45     if (attrName == SVGNames::offsetAttr) {
  46         SVGElement::InvalidationGuard invalidationGuard(this);
  47
  48         if (layoutObject())
  49             markForLayoutAndParentResourceInvalidation(layoutObject());
  50         return;
  51     }
  52
  53     SVGElement::svgAttributeChanged(attrName);
  54 }
  55
  56 LayoutObject* SVGStopElement::createLayoutObject(const ComputedStyle&)
  57 {
  58     return new LayoutSVGGradientStop(this);
  59 }
  60
  61 bool SVGStopElement::layoutObjectIsNeeded(const ComputedStyle&)
  62 {
  63     return true;
  64 }
  65
  66 Color SVGStopElement::stopColorIncludingOpacity() const
  67 {
  68     const ComputedStyle* style = layoutObject() ? layoutObject()->style() : nullptr;
  69     // FIXME: This check for null style exists to address Bug WK 90814, a rare crash condition in
  70     // which the layoutObject or style is null. This entire class is scheduled for removal (Bug WK 86941)
  71     // and we will tolerate this null check until then.
  72     if (!style)
  73         return Color(Color::transparent); // Transparent black.
  74
  75     const SVGComputedStyle& svgStyle = style->svgStyle();
  76     return svgStyle.stopColor().combineWithAlpha(svgStyle.stopOpacity());
  77 }
  78
  79 } // namespace blink