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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 #if ENABLE(SVG)
     25 #include "SVGGradientElement.h"
     26 
     27 #include "Attribute.h"
     28 #include "CSSStyleSelector.h"
     29 #include "RenderSVGHiddenContainer.h"
     30 #include "RenderSVGPath.h"
     31 #include "RenderSVGResourceLinearGradient.h"
     32 #include "RenderSVGResourceRadialGradient.h"
     33 #include "SVGNames.h"
     34 #include "SVGStopElement.h"
     35 #include "SVGTransformList.h"
     36 #include "SVGTransformable.h"
     37 #include "SVGUnitTypes.h"
     38 
     39 namespace WebCore {
     40 
     41 // Animated property definitions
     42 DEFINE_ANIMATED_ENUMERATION(SVGGradientElement, SVGNames::spreadMethodAttr, SpreadMethod, spreadMethod)
     43 DEFINE_ANIMATED_ENUMERATION(SVGGradientElement, SVGNames::gradientUnitsAttr, GradientUnits, gradientUnits)
     44 DEFINE_ANIMATED_TRANSFORM_LIST(SVGGradientElement, SVGNames::gradientTransformAttr, GradientTransform, gradientTransform)
     45 DEFINE_ANIMATED_STRING(SVGGradientElement, XLinkNames::hrefAttr, Href, href)
     46 DEFINE_ANIMATED_BOOLEAN(SVGGradientElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
     47 
     48 SVGGradientElement::SVGGradientElement(const QualifiedName& tagName, Document* document)
     49     : SVGStyledElement(tagName, document)
     50     , m_gradientUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
     51 {
     52 }
     53 
     54 void SVGGradientElement::parseMappedAttribute(Attribute* attr)
     55 {
     56     if (attr->name() == SVGNames::gradientUnitsAttr) {
     57         if (attr->value() == "userSpaceOnUse")
     58             setGradientUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
     59         else if (attr->value() == "objectBoundingBox")
     60             setGradientUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
     61     } else if (attr->name() == SVGNames::gradientTransformAttr) {
     62         SVGTransformList newList;
     63         if (!SVGTransformable::parseTransformAttribute(newList, attr->value()))
     64             newList.clear();
     65 
     66         detachAnimatedGradientTransformListWrappers(newList.size());
     67         setGradientTransformBaseValue(newList);
     68     } else if (attr->name() == SVGNames::spreadMethodAttr) {
     69         if (attr->value() == "reflect")
     70             setSpreadMethodBaseValue(SpreadMethodReflect);
     71         else if (attr->value() == "repeat")
     72             setSpreadMethodBaseValue(SpreadMethodRepeat);
     73         else if (attr->value() == "pad")
     74             setSpreadMethodBaseValue(SpreadMethodPad);
     75     } else {
     76         if (SVGURIReference::parseMappedAttribute(attr))
     77             return;
     78         if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
     79             return;
     80 
     81         SVGStyledElement::parseMappedAttribute(attr);
     82     }
     83 }
     84 
     85 void SVGGradientElement::svgAttributeChanged(const QualifiedName& attrName)
     86 {
     87     SVGStyledElement::svgAttributeChanged(attrName);
     88 
     89     RenderObject* object = renderer();
     90     if (!object)
     91         return;
     92 
     93     if (attrName == SVGNames::gradientUnitsAttr
     94         || attrName == SVGNames::gradientTransformAttr
     95         || attrName == SVGNames::spreadMethodAttr
     96         || SVGURIReference::isKnownAttribute(attrName)
     97         || SVGExternalResourcesRequired::isKnownAttribute(attrName)
     98         || SVGStyledElement::isKnownAttribute(attrName))
     99         object->setNeedsLayout(true);
    100 }
    101 
    102 void SVGGradientElement::synchronizeProperty(const QualifiedName& attrName)
    103 {
    104     SVGStyledElement::synchronizeProperty(attrName);
    105 
    106     if (attrName == anyQName()) {
    107         synchronizeGradientUnits();
    108         synchronizeGradientTransform();
    109         synchronizeSpreadMethod();
    110         synchronizeExternalResourcesRequired();
    111         synchronizeHref();
    112         return;
    113     }
    114 
    115     if (attrName == SVGNames::gradientUnitsAttr)
    116         synchronizeGradientUnits();
    117     else if (attrName == SVGNames::gradientTransformAttr)
    118         synchronizeGradientTransform();
    119     else if (attrName == SVGNames::spreadMethodAttr)
    120         synchronizeSpreadMethod();
    121     else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
    122         synchronizeExternalResourcesRequired();
    123     else if (SVGURIReference::isKnownAttribute(attrName))
    124         synchronizeHref();
    125 }
    126 
    127 void SVGGradientElement::fillPassedAttributeToPropertyTypeMap(AttributeToPropertyTypeMap& attributeToPropertyTypeMap)
    128 {
    129     SVGStyledElement::fillPassedAttributeToPropertyTypeMap(attributeToPropertyTypeMap);
    130 
    131     attributeToPropertyTypeMap.set(SVGNames::spreadMethodAttr, AnimatedEnumeration);
    132     attributeToPropertyTypeMap.set(SVGNames::gradientUnitsAttr, AnimatedEnumeration);
    133     attributeToPropertyTypeMap.set(SVGNames::gradientTransformAttr, AnimatedTransformList);
    134     attributeToPropertyTypeMap.set(XLinkNames::hrefAttr, AnimatedString);
    135 }
    136 
    137 void SVGGradientElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
    138 {
    139     SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
    140 
    141     if (changedByParser)
    142         return;
    143 
    144     if (RenderObject* object = renderer())
    145         object->setNeedsLayout(true);
    146 }
    147 
    148 Vector<Gradient::ColorStop> SVGGradientElement::buildStops()
    149 {
    150     Vector<Gradient::ColorStop> stops;
    151 
    152     float previousOffset = 0.0f;
    153     for (Node* n = firstChild(); n; n = n->nextSibling()) {
    154         SVGElement* element = n->isSVGElement() ? static_cast<SVGElement*>(n) : 0;
    155         if (!element || !element->isGradientStop())
    156             continue;
    157 
    158         SVGStopElement* stop = static_cast<SVGStopElement*>(element);
    159         Color color = stop->stopColorIncludingOpacity();
    160 
    161         // Figure out right monotonic offset
    162         float offset = stop->offset();
    163         offset = std::min(std::max(previousOffset, offset), 1.0f);
    164         previousOffset = offset;
    165 
    166         // Extract individual channel values
    167         // FIXME: Why doesn't ColorStop take a Color and an offset??
    168         float r, g, b, a;
    169         color.getRGBA(r, g, b, a);
    170 
    171         stops.append(Gradient::ColorStop(offset, r, g, b, a));
    172     }
    173 
    174     return stops;
    175 }
    176 
    177 }
    178 
    179 #endif // ENABLE(SVG)
    180