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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 #include "core/svg/SVGElementInstance.h"
     28 
     29 namespace WebCore {
     30 
     31 // Animated property definitions
     32 DEFINE_ANIMATED_NUMBER(SVGStopElement, SVGNames::offsetAttr, Offset, offset)
     33 
     34 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGStopElement)
     35     REGISTER_LOCAL_ANIMATED_PROPERTY(offset)
     36     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGElement)
     37 END_REGISTER_ANIMATED_PROPERTIES
     38 
     39 inline SVGStopElement::SVGStopElement(Document& document)
     40     : SVGElement(SVGNames::stopTag, document)
     41     , m_offset(0)
     42 {
     43     ScriptWrappable::init(this);
     44     registerAnimatedPropertiesForSVGStopElement();
     45 }
     46 
     47 PassRefPtr<SVGStopElement> SVGStopElement::create(Document& document)
     48 {
     49     return adoptRef(new SVGStopElement(document));
     50 }
     51 
     52 bool SVGStopElement::isSupportedAttribute(const QualifiedName& attrName)
     53 {
     54     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     55     if (supportedAttributes.isEmpty())
     56         supportedAttributes.add(SVGNames::offsetAttr);
     57     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     58 }
     59 
     60 void SVGStopElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     61 {
     62     if (!isSupportedAttribute(name)) {
     63         SVGElement::parseAttribute(name, value);
     64         return;
     65     }
     66 
     67     if (name == SVGNames::offsetAttr) {
     68         if (value.endsWith('%'))
     69             setOffsetBaseValue(value.string().left(value.length() - 1).toFloat() / 100.0f);
     70         else
     71             setOffsetBaseValue(value.toFloat());
     72         return;
     73     }
     74 
     75     ASSERT_NOT_REACHED();
     76 }
     77 
     78 void SVGStopElement::svgAttributeChanged(const QualifiedName& attrName)
     79 {
     80     if (!isSupportedAttribute(attrName)) {
     81         SVGElement::svgAttributeChanged(attrName);
     82         return;
     83     }
     84 
     85     SVGElementInstance::InvalidationGuard invalidationGuard(this);
     86 
     87     if (!renderer())
     88         return;
     89 
     90     if (attrName == SVGNames::offsetAttr) {
     91         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer());
     92         return;
     93     }
     94 
     95     ASSERT_NOT_REACHED();
     96 }
     97 
     98 RenderObject* SVGStopElement::createRenderer(RenderStyle*)
     99 {
    100     return new RenderSVGGradientStop(this);
    101 }
    102 
    103 bool SVGStopElement::rendererIsNeeded(const RenderStyle&)
    104 {
    105     return true;
    106 }
    107 
    108 Color SVGStopElement::stopColorIncludingOpacity() const
    109 {
    110     RenderStyle* style = renderer() ? renderer()->style() : 0;
    111     // FIXME: This check for null style exists to address Bug WK 90814, a rare crash condition in
    112     // which the renderer or style is null. This entire class is scheduled for removal (Bug WK 86941)
    113     // and we will tolerate this null check until then.
    114     if (!style || !style->svgStyle())
    115         return Color(Color::transparent, true); // Transparent black.
    116 
    117     const SVGRenderStyle* svgStyle = style->svgStyle();
    118     return colorWithOverrideAlpha(svgStyle->stopColor().rgb(), svgStyle->stopOpacity());
    119 }
    120 
    121 }
    122