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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 "SVGNames.h"
     26 #include "core/rendering/svg/RenderSVGGradientStop.h"
     27 #include "core/rendering/svg/RenderSVGResource.h"
     28 #include "core/svg/SVGElementInstance.h"
     29 
     30 namespace WebCore {
     31 
     32 // Animated property definitions
     33 DEFINE_ANIMATED_NUMBER(SVGStopElement, SVGNames::offsetAttr, Offset, offset)
     34 
     35 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGStopElement)
     36     REGISTER_LOCAL_ANIMATED_PROPERTY(offset)
     37     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGElement)
     38 END_REGISTER_ANIMATED_PROPERTIES
     39 
     40 inline SVGStopElement::SVGStopElement(const QualifiedName& tagName, Document* document)
     41     : SVGElement(tagName, document)
     42     , m_offset(0)
     43 {
     44     ASSERT(hasTagName(SVGNames::stopTag));
     45     ScriptWrappable::init(this);
     46     registerAnimatedPropertiesForSVGStopElement();
     47 }
     48 
     49 PassRefPtr<SVGStopElement> SVGStopElement::create(const QualifiedName& tagName, Document* document)
     50 {
     51     return adoptRef(new SVGStopElement(tagName, document));
     52 }
     53 
     54 bool SVGStopElement::isSupportedAttribute(const QualifiedName& attrName)
     55 {
     56     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     57     if (supportedAttributes.isEmpty())
     58         supportedAttributes.add(SVGNames::offsetAttr);
     59     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     60 }
     61 
     62 void SVGStopElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     63 {
     64     if (!isSupportedAttribute(name)) {
     65         SVGElement::parseAttribute(name, value);
     66         return;
     67     }
     68 
     69     if (name == SVGNames::offsetAttr) {
     70         if (value.endsWith('%'))
     71             setOffsetBaseValue(value.string().left(value.length() - 1).toFloat() / 100.0f);
     72         else
     73             setOffsetBaseValue(value.toFloat());
     74         return;
     75     }
     76 
     77     ASSERT_NOT_REACHED();
     78 }
     79 
     80 void SVGStopElement::svgAttributeChanged(const QualifiedName& attrName)
     81 {
     82     if (!isSupportedAttribute(attrName)) {
     83         SVGElement::svgAttributeChanged(attrName);
     84         return;
     85     }
     86 
     87     SVGElementInstance::InvalidationGuard invalidationGuard(this);
     88 
     89     if (!renderer())
     90         return;
     91 
     92     if (attrName == SVGNames::offsetAttr) {
     93         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer());
     94         return;
     95     }
     96 
     97     ASSERT_NOT_REACHED();
     98 }
     99 
    100 RenderObject* SVGStopElement::createRenderer(RenderStyle*)
    101 {
    102     return new RenderSVGGradientStop(this);
    103 }
    104 
    105 bool SVGStopElement::rendererIsNeeded(const NodeRenderingContext&)
    106 {
    107     return true;
    108 }
    109 
    110 Color SVGStopElement::stopColorIncludingOpacity() const
    111 {
    112     RenderStyle* style = renderer() ? renderer()->style() : 0;
    113     // FIXME: This check for null style exists to address Bug WK 90814, a rare crash condition in
    114     // which the renderer or style is null. This entire class is scheduled for removal (Bug WK 86941)
    115     // and we will tolerate this null check until then.
    116     if (!style || !style->svgStyle())
    117         return Color(Color::transparent); // Transparent black.
    118 
    119     const SVGRenderStyle* svgStyle = style->svgStyle();
    120     return colorWithOverrideAlpha(svgStyle->stopColor().rgb(), svgStyle->stopOpacity());
    121 }
    122 
    123 }
    124