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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2008 Eric Seidel <eric (at) webkit.org>
      5  * Copyright (C) 2008 Dirk Schulze <krit (at) webkit.org>
      6  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  */
     23 
     24 #include "config.h"
     25 
     26 #include "core/svg/SVGRadialGradientElement.h"
     27 
     28 #include "core/rendering/svg/RenderSVGResourceRadialGradient.h"
     29 #include "core/svg/RadialGradientAttributes.h"
     30 #include "core/svg/SVGTransformList.h"
     31 
     32 namespace blink {
     33 
     34 inline SVGRadialGradientElement::SVGRadialGradientElement(Document& document)
     35     : SVGGradientElement(SVGNames::radialGradientTag, document)
     36     , m_cx(SVGAnimatedLength::create(this, SVGNames::cxAttr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
     37     , m_cy(SVGAnimatedLength::create(this, SVGNames::cyAttr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
     38     , m_r(SVGAnimatedLength::create(this, SVGNames::rAttr, SVGLength::create(LengthModeOther), ForbidNegativeLengths))
     39     , m_fx(SVGAnimatedLength::create(this, SVGNames::fxAttr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
     40     , m_fy(SVGAnimatedLength::create(this, SVGNames::fyAttr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
     41     , m_fr(SVGAnimatedLength::create(this, SVGNames::frAttr, SVGLength::create(LengthModeOther), ForbidNegativeLengths))
     42 {
     43     // Spec: If the cx/cy/r attribute is not specified, the effect is as if a value of "50%" were specified.
     44     m_cx->setDefaultValueAsString("50%");
     45     m_cy->setDefaultValueAsString("50%");
     46     m_r->setDefaultValueAsString("50%");
     47 
     48     // SVG2-Draft Spec: If the fr attributed is not specified, the effect is as if a value of "0%" were specified.
     49     m_fr->setDefaultValueAsString("0%");
     50 
     51     addToPropertyMap(m_cx);
     52     addToPropertyMap(m_cy);
     53     addToPropertyMap(m_r);
     54     addToPropertyMap(m_fx);
     55     addToPropertyMap(m_fy);
     56     addToPropertyMap(m_fr);
     57 }
     58 
     59 DEFINE_NODE_FACTORY(SVGRadialGradientElement)
     60 
     61 bool SVGRadialGradientElement::isSupportedAttribute(const QualifiedName& attrName)
     62 {
     63     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     64     if (supportedAttributes.isEmpty()) {
     65         supportedAttributes.add(SVGNames::cxAttr);
     66         supportedAttributes.add(SVGNames::cyAttr);
     67         supportedAttributes.add(SVGNames::fxAttr);
     68         supportedAttributes.add(SVGNames::fyAttr);
     69         supportedAttributes.add(SVGNames::rAttr);
     70         supportedAttributes.add(SVGNames::frAttr);
     71     }
     72     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     73 }
     74 
     75 void SVGRadialGradientElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     76 {
     77     SVGParsingError parseError = NoError;
     78 
     79     if (!isSupportedAttribute(name))
     80         SVGGradientElement::parseAttribute(name, value);
     81     else if (name == SVGNames::cxAttr)
     82         m_cx->setBaseValueAsString(value, parseError);
     83     else if (name == SVGNames::cyAttr)
     84         m_cy->setBaseValueAsString(value, parseError);
     85     else if (name == SVGNames::rAttr)
     86         m_r->setBaseValueAsString(value, parseError);
     87     else if (name == SVGNames::fxAttr)
     88         m_fx->setBaseValueAsString(value, parseError);
     89     else if (name == SVGNames::fyAttr)
     90         m_fy->setBaseValueAsString(value, parseError);
     91     else if (name == SVGNames::frAttr)
     92         m_fr->setBaseValueAsString(value, parseError);
     93     else
     94         ASSERT_NOT_REACHED();
     95 
     96     reportAttributeParsingError(parseError, name, value);
     97 }
     98 
     99 void SVGRadialGradientElement::svgAttributeChanged(const QualifiedName& attrName)
    100 {
    101     if (!isSupportedAttribute(attrName)) {
    102         SVGGradientElement::svgAttributeChanged(attrName);
    103         return;
    104     }
    105 
    106     SVGElement::InvalidationGuard invalidationGuard(this);
    107 
    108     updateRelativeLengthsInformation();
    109 
    110     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
    111     if (renderer)
    112         renderer->invalidateCacheAndMarkForLayout();
    113 }
    114 
    115 RenderObject* SVGRadialGradientElement::createRenderer(RenderStyle*)
    116 {
    117     return new RenderSVGResourceRadialGradient(this);
    118 }
    119 
    120 static void setGradientAttributes(SVGGradientElement* element, RadialGradientAttributes& attributes, bool isRadial = true)
    121 {
    122     if (!attributes.hasSpreadMethod() && element->spreadMethod()->isSpecified())
    123         attributes.setSpreadMethod(element->spreadMethod()->currentValue()->enumValue());
    124 
    125     if (!attributes.hasGradientUnits() && element->gradientUnits()->isSpecified())
    126         attributes.setGradientUnits(element->gradientUnits()->currentValue()->enumValue());
    127 
    128     if (!attributes.hasGradientTransform() && element->gradientTransform()->isSpecified()) {
    129         AffineTransform transform;
    130         element->gradientTransform()->currentValue()->concatenate(transform);
    131         attributes.setGradientTransform(transform);
    132     }
    133 
    134     if (!attributes.hasStops()) {
    135         const Vector<Gradient::ColorStop>& stops(element->buildStops());
    136         if (!stops.isEmpty())
    137             attributes.setStops(stops);
    138     }
    139 
    140     if (isRadial) {
    141         SVGRadialGradientElement* radial = toSVGRadialGradientElement(element);
    142 
    143         if (!attributes.hasCx() && radial->cx()->isSpecified())
    144             attributes.setCx(radial->cx()->currentValue());
    145 
    146         if (!attributes.hasCy() && radial->cy()->isSpecified())
    147             attributes.setCy(radial->cy()->currentValue());
    148 
    149         if (!attributes.hasR() && radial->r()->isSpecified())
    150             attributes.setR(radial->r()->currentValue());
    151 
    152         if (!attributes.hasFx() && radial->fx()->isSpecified())
    153             attributes.setFx(radial->fx()->currentValue());
    154 
    155         if (!attributes.hasFy() && radial->fy()->isSpecified())
    156             attributes.setFy(radial->fy()->currentValue());
    157 
    158         if (!attributes.hasFr() && radial->fr()->isSpecified())
    159             attributes.setFr(radial->fr()->currentValue());
    160     }
    161 }
    162 
    163 bool SVGRadialGradientElement::collectGradientAttributes(RadialGradientAttributes& attributes)
    164 {
    165     if (!renderer())
    166         return false;
    167 
    168     WillBeHeapHashSet<RawPtrWillBeMember<SVGGradientElement> > processedGradients;
    169     SVGGradientElement* current = this;
    170 
    171     setGradientAttributes(current, attributes);
    172     processedGradients.add(current);
    173 
    174     while (true) {
    175         // Respect xlink:href, take attributes from referenced element
    176         Node* refNode = SVGURIReference::targetElementFromIRIString(current->href()->currentValue()->value(), treeScope());
    177         if (refNode && isSVGGradientElement(*refNode)) {
    178             current = toSVGGradientElement(refNode);
    179 
    180             // Cycle detection
    181             if (processedGradients.contains(current))
    182                 break;
    183 
    184             if (!current->renderer())
    185                 return false;
    186 
    187             setGradientAttributes(current, attributes, isSVGRadialGradientElement(*current));
    188             processedGradients.add(current);
    189         } else {
    190             break;
    191         }
    192     }
    193 
    194     // Handle default values for fx/fy
    195     if (!attributes.hasFx())
    196         attributes.setFx(attributes.cx());
    197 
    198     if (!attributes.hasFy())
    199         attributes.setFy(attributes.cy());
    200 
    201     return true;
    202 }
    203 
    204 bool SVGRadialGradientElement::selfHasRelativeLengths() const
    205 {
    206     return m_cx->currentValue()->isRelative()
    207         || m_cy->currentValue()->isRelative()
    208         || m_r->currentValue()->isRelative()
    209         || m_fx->currentValue()->isRelative()
    210         || m_fy->currentValue()->isRelative()
    211         || m_fr->currentValue()->isRelative();
    212 }
    213 
    214 } // namespace blink
    215