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      1 /*
      2  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis (at) 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 
     23 #include "core/svg/SVGStopElement.h"
     24 
     25 #include "core/rendering/svg/RenderSVGGradientStop.h"
     26 #include "core/rendering/svg/RenderSVGResource.h"
     27 
     28 namespace blink {
     29 
     30 inline SVGStopElement::SVGStopElement(Document& document)
     31     : SVGElement(SVGNames::stopTag, document)
     32     , m_offset(SVGAnimatedNumber::create(this, SVGNames::offsetAttr, SVGNumberAcceptPercentage::create()))
     33 {
     34     addToPropertyMap(m_offset);
     35 }
     36 
     37 DEFINE_NODE_FACTORY(SVGStopElement)
     38 
     39 bool SVGStopElement::isSupportedAttribute(const QualifiedName& attrName)
     40 {
     41     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     42     if (supportedAttributes.isEmpty())
     43         supportedAttributes.add(SVGNames::offsetAttr);
     44     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     45 }
     46 
     47 void SVGStopElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     48 {
     49     if (!isSupportedAttribute(name)) {
     50         SVGElement::parseAttribute(name, value);
     51         return;
     52     }
     53 
     54     SVGParsingError parseError = NoError;
     55 
     56     if (name == SVGNames::offsetAttr)
     57         m_offset->setBaseValueAsString(value, parseError);
     58     else
     59         ASSERT_NOT_REACHED();
     60 
     61     reportAttributeParsingError(parseError, name, value);
     62 }
     63 
     64 void SVGStopElement::svgAttributeChanged(const QualifiedName& attrName)
     65 {
     66     if (!isSupportedAttribute(attrName)) {
     67         SVGElement::svgAttributeChanged(attrName);
     68         return;
     69     }
     70 
     71     SVGElement::InvalidationGuard invalidationGuard(this);
     72 
     73     if (!renderer())
     74         return;
     75 
     76     if (attrName == SVGNames::offsetAttr) {
     77         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer());
     78         return;
     79     }
     80 
     81     ASSERT_NOT_REACHED();
     82 }
     83 
     84 RenderObject* SVGStopElement::createRenderer(RenderStyle*)
     85 {
     86     return new RenderSVGGradientStop(this);
     87 }
     88 
     89 bool SVGStopElement::rendererIsNeeded(const RenderStyle&)
     90 {
     91     return true;
     92 }
     93 
     94 Color SVGStopElement::stopColorIncludingOpacity() const
     95 {
     96     RenderStyle* style = renderer() ? renderer()->style() : 0;
     97     // FIXME: This check for null style exists to address Bug WK 90814, a rare crash condition in
     98     // which the renderer or style is null. This entire class is scheduled for removal (Bug WK 86941)
     99     // and we will tolerate this null check until then.
    100     if (!style)
    101         return Color(Color::transparent); // Transparent black.
    102 
    103     const SVGRenderStyle& svgStyle = style->svgStyle();
    104     return svgStyle.stopColor().combineWithAlpha(svgStyle.stopOpacity());
    105 }
    106 
    107 } // namespace blink
    108