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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) Research In Motion Limited 2010. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #include "core/svg/SVGGradientElement.h"
     25 
     26 #include "SVGNames.h"
     27 #include "XLinkNames.h"
     28 #include "core/dom/Attribute.h"
     29 #include "core/rendering/svg/RenderSVGHiddenContainer.h"
     30 #include "core/rendering/svg/RenderSVGPath.h"
     31 #include "core/rendering/svg/RenderSVGResourceLinearGradient.h"
     32 #include "core/rendering/svg/RenderSVGResourceRadialGradient.h"
     33 #include "core/svg/SVGElementInstance.h"
     34 #include "core/svg/SVGStopElement.h"
     35 #include "core/svg/SVGTransformList.h"
     36 #include "core/svg/SVGTransformable.h"
     37 
     38 namespace WebCore {
     39 
     40 // Animated property definitions
     41 DEFINE_ANIMATED_ENUMERATION(SVGGradientElement, SVGNames::spreadMethodAttr, SpreadMethod, spreadMethod, SVGSpreadMethodType)
     42 DEFINE_ANIMATED_ENUMERATION(SVGGradientElement, SVGNames::gradientUnitsAttr, GradientUnits, gradientUnits, SVGUnitTypes::SVGUnitType)
     43 DEFINE_ANIMATED_TRANSFORM_LIST(SVGGradientElement, SVGNames::gradientTransformAttr, GradientTransform, gradientTransform)
     44 DEFINE_ANIMATED_STRING(SVGGradientElement, XLinkNames::hrefAttr, Href, href)
     45 DEFINE_ANIMATED_BOOLEAN(SVGGradientElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
     46 
     47 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGGradientElement)
     48     REGISTER_LOCAL_ANIMATED_PROPERTY(spreadMethod)
     49     REGISTER_LOCAL_ANIMATED_PROPERTY(gradientUnits)
     50     REGISTER_LOCAL_ANIMATED_PROPERTY(gradientTransform)
     51     REGISTER_LOCAL_ANIMATED_PROPERTY(href)
     52     REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     53     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGElement)
     54 END_REGISTER_ANIMATED_PROPERTIES
     55 
     56 SVGGradientElement::SVGGradientElement(const QualifiedName& tagName, Document* document)
     57     : SVGElement(tagName, document)
     58     , m_spreadMethod(SVGSpreadMethodPad)
     59     , m_gradientUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
     60 {
     61     ScriptWrappable::init(this);
     62     registerAnimatedPropertiesForSVGGradientElement();
     63 }
     64 
     65 bool SVGGradientElement::isSupportedAttribute(const QualifiedName& attrName)
     66 {
     67     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     68     if (supportedAttributes.isEmpty()) {
     69         SVGURIReference::addSupportedAttributes(supportedAttributes);
     70         SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
     71         supportedAttributes.add(SVGNames::gradientUnitsAttr);
     72         supportedAttributes.add(SVGNames::gradientTransformAttr);
     73         supportedAttributes.add(SVGNames::spreadMethodAttr);
     74     }
     75     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     76 }
     77 
     78 void SVGGradientElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     79 {
     80     if (!isSupportedAttribute(name)) {
     81         SVGElement::parseAttribute(name, value);
     82         return;
     83     }
     84 
     85     if (name == SVGNames::gradientUnitsAttr) {
     86         SVGUnitTypes::SVGUnitType propertyValue = SVGPropertyTraits<SVGUnitTypes::SVGUnitType>::fromString(value);
     87         if (propertyValue > 0)
     88             setGradientUnitsBaseValue(propertyValue);
     89         return;
     90     }
     91 
     92     if (name == SVGNames::gradientTransformAttr) {
     93         SVGTransformList newList;
     94         newList.parse(value);
     95         detachAnimatedGradientTransformListWrappers(newList.size());
     96         setGradientTransformBaseValue(newList);
     97         return;
     98     }
     99 
    100     if (name == SVGNames::spreadMethodAttr) {
    101         SVGSpreadMethodType propertyValue = SVGPropertyTraits<SVGSpreadMethodType>::fromString(value);
    102         if (propertyValue > 0)
    103             setSpreadMethodBaseValue(propertyValue);
    104         return;
    105     }
    106 
    107     if (SVGURIReference::parseAttribute(name, value))
    108         return;
    109     if (SVGExternalResourcesRequired::parseAttribute(name, value))
    110         return;
    111 
    112     ASSERT_NOT_REACHED();
    113 }
    114 
    115 void SVGGradientElement::svgAttributeChanged(const QualifiedName& attrName)
    116 {
    117     if (!isSupportedAttribute(attrName)) {
    118         SVGElement::svgAttributeChanged(attrName);
    119         return;
    120     }
    121 
    122     SVGElementInstance::InvalidationGuard invalidationGuard(this);
    123 
    124     if (RenderObject* object = renderer())
    125         object->setNeedsLayout();
    126 }
    127 
    128 void SVGGradientElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
    129 {
    130     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
    131 
    132     if (changedByParser)
    133         return;
    134 
    135     if (RenderObject* object = renderer())
    136         object->setNeedsLayout();
    137 }
    138 
    139 Vector<Gradient::ColorStop> SVGGradientElement::buildStops()
    140 {
    141     Vector<Gradient::ColorStop> stops;
    142 
    143     float previousOffset = 0.0f;
    144     for (Node* n = firstChild(); n; n = n->nextSibling()) {
    145         SVGElement* element = n->isSVGElement() ? toSVGElement(n) : 0;
    146         if (!element || !element->isGradientStop())
    147             continue;
    148 
    149         SVGStopElement* stop = toSVGStopElement(element);
    150         Color color = stop->stopColorIncludingOpacity();
    151 
    152         // Figure out right monotonic offset
    153         float offset = stop->offsetCurrentValue();
    154         offset = std::min(std::max(previousOffset, offset), 1.0f);
    155         previousOffset = offset;
    156 
    157         // Extract individual channel values
    158         // FIXME: Why doesn't ColorStop take a Color and an offset??
    159         float r, g, b, a;
    160         color.getRGBA(r, g, b, a);
    161 
    162         stops.append(Gradient::ColorStop(offset, r, g, b, a));
    163     }
    164 
    165     return stops;
    166 }
    167 
    168 }
    169