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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 "XLinkNames.h"
     27 #include "core/dom/Attribute.h"
     28 #include "core/rendering/svg/RenderSVGHiddenContainer.h"
     29 #include "core/rendering/svg/RenderSVGPath.h"
     30 #include "core/rendering/svg/RenderSVGResourceLinearGradient.h"
     31 #include "core/rendering/svg/RenderSVGResourceRadialGradient.h"
     32 #include "core/svg/SVGElementInstance.h"
     33 #include "core/svg/SVGStopElement.h"
     34 #include "core/svg/SVGTransformList.h"
     35 
     36 namespace WebCore {
     37 
     38 // Animated property definitions
     39 DEFINE_ANIMATED_ENUMERATION(SVGGradientElement, SVGNames::spreadMethodAttr, SpreadMethod, spreadMethod, SVGSpreadMethodType)
     40 DEFINE_ANIMATED_ENUMERATION(SVGGradientElement, SVGNames::gradientUnitsAttr, GradientUnits, gradientUnits, SVGUnitTypes::SVGUnitType)
     41 DEFINE_ANIMATED_TRANSFORM_LIST(SVGGradientElement, SVGNames::gradientTransformAttr, GradientTransform, gradientTransform)
     42 DEFINE_ANIMATED_STRING(SVGGradientElement, XLinkNames::hrefAttr, Href, href)
     43 DEFINE_ANIMATED_BOOLEAN(SVGGradientElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
     44 
     45 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGGradientElement)
     46     REGISTER_LOCAL_ANIMATED_PROPERTY(spreadMethod)
     47     REGISTER_LOCAL_ANIMATED_PROPERTY(gradientUnits)
     48     REGISTER_LOCAL_ANIMATED_PROPERTY(gradientTransform)
     49     REGISTER_LOCAL_ANIMATED_PROPERTY(href)
     50     REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
     51     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGElement)
     52 END_REGISTER_ANIMATED_PROPERTIES
     53 
     54 SVGGradientElement::SVGGradientElement(const QualifiedName& tagName, Document& document)
     55     : SVGElement(tagName, document)
     56     , m_spreadMethod(SVGSpreadMethodPad)
     57     , m_gradientUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
     58 {
     59     ScriptWrappable::init(this);
     60     registerAnimatedPropertiesForSVGGradientElement();
     61 }
     62 
     63 bool SVGGradientElement::isSupportedAttribute(const QualifiedName& attrName)
     64 {
     65     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     66     if (supportedAttributes.isEmpty()) {
     67         SVGURIReference::addSupportedAttributes(supportedAttributes);
     68         SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
     69         supportedAttributes.add(SVGNames::gradientUnitsAttr);
     70         supportedAttributes.add(SVGNames::gradientTransformAttr);
     71         supportedAttributes.add(SVGNames::spreadMethodAttr);
     72     }
     73     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     74 }
     75 
     76 void SVGGradientElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     77 {
     78     if (!isSupportedAttribute(name)) {
     79         SVGElement::parseAttribute(name, value);
     80         return;
     81     }
     82 
     83     if (name == SVGNames::gradientUnitsAttr) {
     84         SVGUnitTypes::SVGUnitType propertyValue = SVGPropertyTraits<SVGUnitTypes::SVGUnitType>::fromString(value);
     85         if (propertyValue > 0)
     86             setGradientUnitsBaseValue(propertyValue);
     87         return;
     88     }
     89 
     90     if (name == SVGNames::gradientTransformAttr) {
     91         SVGTransformList newList;
     92         newList.parse(value);
     93         detachAnimatedGradientTransformListWrappers(newList.size());
     94         setGradientTransformBaseValue(newList);
     95         return;
     96     }
     97 
     98     if (name == SVGNames::spreadMethodAttr) {
     99         SVGSpreadMethodType propertyValue = SVGPropertyTraits<SVGSpreadMethodType>::fromString(value);
    100         if (propertyValue > 0)
    101             setSpreadMethodBaseValue(propertyValue);
    102         return;
    103     }
    104 
    105     if (SVGURIReference::parseAttribute(name, value))
    106         return;
    107     if (SVGExternalResourcesRequired::parseAttribute(name, value))
    108         return;
    109 
    110     ASSERT_NOT_REACHED();
    111 }
    112 
    113 void SVGGradientElement::svgAttributeChanged(const QualifiedName& attrName)
    114 {
    115     if (!isSupportedAttribute(attrName)) {
    116         SVGElement::svgAttributeChanged(attrName);
    117         return;
    118     }
    119 
    120     SVGElementInstance::InvalidationGuard invalidationGuard(this);
    121 
    122     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
    123     if (renderer)
    124         renderer->invalidateCacheAndMarkForLayout();
    125 }
    126 
    127 void SVGGradientElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
    128 {
    129     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
    130 
    131     if (changedByParser)
    132         return;
    133 
    134     if (RenderObject* object = renderer())
    135         object->setNeedsLayout();
    136 }
    137 
    138 Vector<Gradient::ColorStop> SVGGradientElement::buildStops()
    139 {
    140     Vector<Gradient::ColorStop> stops;
    141 
    142     float previousOffset = 0.0f;
    143     for (Node* n = firstChild(); n; n = n->nextSibling()) {
    144         SVGElement* element = n->isSVGElement() ? toSVGElement(n) : 0;
    145         if (!element || !element->isGradientStop())
    146             continue;
    147 
    148         SVGStopElement* stop = toSVGStopElement(element);
    149         Color color = stop->stopColorIncludingOpacity();
    150 
    151         // Figure out right monotonic offset
    152         float offset = stop->offsetCurrentValue();
    153         offset = std::min(std::max(previousOffset, offset), 1.0f);
    154         previousOffset = offset;
    155 
    156         // Extract individual channel values
    157         // FIXME: Why doesn't ColorStop take a Color and an offset??
    158         float r, g, b, a;
    159         color.getRGBA(r, g, b, a);
    160 
    161         stops.append(Gradient::ColorStop(offset, r, g, b, a));
    162     }
    163 
    164     return stops;
    165 }
    166 
    167 }
    168