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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 WebCore {
     29 
     30 inline SVGStopElement::SVGStopElement(Document& document)
     31     : SVGElement(SVGNames::stopTag, document)
     32     , m_offset(SVGAnimatedNumber::create(this, SVGNames::offsetAttr, SVGNumberAcceptPercentage::create()))
     33 {
     34     ScriptWrappable::init(this);
     35 
     36     addToPropertyMap(m_offset);
     37 }
     38 
     39 DEFINE_NODE_FACTORY(SVGStopElement)
     40 
     41 bool SVGStopElement::isSupportedAttribute(const QualifiedName& attrName)
     42 {
     43     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     44     if (supportedAttributes.isEmpty())
     45         supportedAttributes.add(SVGNames::offsetAttr);
     46     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     47 }
     48 
     49 void SVGStopElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     50 {
     51     if (!isSupportedAttribute(name)) {
     52         SVGElement::parseAttribute(name, value);
     53         return;
     54     }
     55 
     56     SVGParsingError parseError = NoError;
     57 
     58     if (name == SVGNames::offsetAttr)
     59         m_offset->setBaseValueAsString(value, parseError);
     60     else
     61         ASSERT_NOT_REACHED();
     62 
     63     reportAttributeParsingError(parseError, name, value);
     64 }
     65 
     66 void SVGStopElement::svgAttributeChanged(const QualifiedName& attrName)
     67 {
     68     if (!isSupportedAttribute(attrName)) {
     69         SVGElement::svgAttributeChanged(attrName);
     70         return;
     71     }
     72 
     73     SVGElement::InvalidationGuard invalidationGuard(this);
     74 
     75     if (!renderer())
     76         return;
     77 
     78     if (attrName == SVGNames::offsetAttr) {
     79         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer());
     80         return;
     81     }
     82 
     83     ASSERT_NOT_REACHED();
     84 }
     85 
     86 RenderObject* SVGStopElement::createRenderer(RenderStyle*)
     87 {
     88     return new RenderSVGGradientStop(this);
     89 }
     90 
     91 bool SVGStopElement::rendererIsNeeded(const RenderStyle&)
     92 {
     93     return true;
     94 }
     95 
     96 Color SVGStopElement::stopColorIncludingOpacity() const
     97 {
     98     RenderStyle* style = renderer() ? renderer()->style() : 0;
     99     // FIXME: This check for null style exists to address Bug WK 90814, a rare crash condition in
    100     // which the renderer or style is null. This entire class is scheduled for removal (Bug WK 86941)
    101     // and we will tolerate this null check until then.
    102     if (!style || !style->svgStyle())
    103         return Color(Color::transparent); // Transparent black.
    104 
    105     const SVGRenderStyle* svgStyle = style->svgStyle();
    106     return svgStyle->stopColor().combineWithAlpha(svgStyle->stopOpacity());
    107 }
    108 
    109 }
    110