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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/SVGLinearGradientElement.h"
     27 
     28 #include "core/rendering/svg/RenderSVGResourceLinearGradient.h"
     29 #include "core/svg/LinearGradientAttributes.h"
     30 #include "core/svg/SVGElementInstance.h"
     31 #include "core/svg/SVGLength.h"
     32 #include "core/svg/SVGTransformList.h"
     33 
     34 namespace WebCore {
     35 
     36 // Animated property definitions
     37 DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::x1Attr, X1, x1)
     38 DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::y1Attr, Y1, y1)
     39 DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::x2Attr, X2, x2)
     40 DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::y2Attr, Y2, y2)
     41 
     42 BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGLinearGradientElement)
     43     REGISTER_LOCAL_ANIMATED_PROPERTY(x1)
     44     REGISTER_LOCAL_ANIMATED_PROPERTY(y1)
     45     REGISTER_LOCAL_ANIMATED_PROPERTY(x2)
     46     REGISTER_LOCAL_ANIMATED_PROPERTY(y2)
     47     REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGradientElement)
     48 END_REGISTER_ANIMATED_PROPERTIES
     49 
     50 inline SVGLinearGradientElement::SVGLinearGradientElement(Document& document)
     51     : SVGGradientElement(SVGNames::linearGradientTag, document)
     52     , m_x1(LengthModeWidth)
     53     , m_y1(LengthModeHeight)
     54     , m_x2(LengthModeWidth, "100%")
     55     , m_y2(LengthModeHeight)
     56 {
     57     // Spec: If the x2 attribute is not specified, the effect is as if a value of "100%" were specified.
     58     ScriptWrappable::init(this);
     59     registerAnimatedPropertiesForSVGLinearGradientElement();
     60 }
     61 
     62 PassRefPtr<SVGLinearGradientElement> SVGLinearGradientElement::create(Document& document)
     63 {
     64     return adoptRef(new SVGLinearGradientElement(document));
     65 }
     66 
     67 bool SVGLinearGradientElement::isSupportedAttribute(const QualifiedName& attrName)
     68 {
     69     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     70     if (supportedAttributes.isEmpty()) {
     71         supportedAttributes.add(SVGNames::x1Attr);
     72         supportedAttributes.add(SVGNames::x2Attr);
     73         supportedAttributes.add(SVGNames::y1Attr);
     74         supportedAttributes.add(SVGNames::y2Attr);
     75     }
     76     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     77 }
     78 
     79 void SVGLinearGradientElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     80 {
     81     SVGParsingError parseError = NoError;
     82 
     83     if (!isSupportedAttribute(name))
     84         SVGGradientElement::parseAttribute(name, value);
     85     else if (name == SVGNames::x1Attr)
     86         setX1BaseValue(SVGLength::construct(LengthModeWidth, value, parseError));
     87     else if (name == SVGNames::y1Attr)
     88         setY1BaseValue(SVGLength::construct(LengthModeHeight, value, parseError));
     89     else if (name == SVGNames::x2Attr)
     90         setX2BaseValue(SVGLength::construct(LengthModeWidth, value, parseError));
     91     else if (name == SVGNames::y2Attr)
     92         setY2BaseValue(SVGLength::construct(LengthModeHeight, value, parseError));
     93     else
     94         ASSERT_NOT_REACHED();
     95 
     96     reportAttributeParsingError(parseError, name, value);
     97 }
     98 
     99 void SVGLinearGradientElement::svgAttributeChanged(const QualifiedName& attrName)
    100 {
    101     if (!isSupportedAttribute(attrName)) {
    102         SVGGradientElement::svgAttributeChanged(attrName);
    103         return;
    104     }
    105 
    106     SVGElementInstance::InvalidationGuard invalidationGuard(this);
    107 
    108     updateRelativeLengthsInformation();
    109 
    110     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
    111     if (renderer)
    112         renderer->invalidateCacheAndMarkForLayout();
    113 }
    114 
    115 RenderObject* SVGLinearGradientElement::createRenderer(RenderStyle*)
    116 {
    117     return new RenderSVGResourceLinearGradient(this);
    118 }
    119 
    120 bool SVGLinearGradientElement::collectGradientAttributes(LinearGradientAttributes& attributes)
    121 {
    122     HashSet<SVGGradientElement*> processedGradients;
    123 
    124     bool isLinear = true;
    125     SVGGradientElement* current = this;
    126 
    127     while (current) {
    128         if (!current->renderer())
    129             return false;
    130 
    131         if (!attributes.hasSpreadMethod() && current->hasAttribute(SVGNames::spreadMethodAttr))
    132             attributes.setSpreadMethod(current->spreadMethodCurrentValue());
    133 
    134         if (!attributes.hasGradientUnits() && current->hasAttribute(SVGNames::gradientUnitsAttr))
    135             attributes.setGradientUnits(current->gradientUnitsCurrentValue());
    136 
    137         if (!attributes.hasGradientTransform() && current->hasAttribute(SVGNames::gradientTransformAttr)) {
    138             AffineTransform transform;
    139             current->gradientTransformCurrentValue().concatenate(transform);
    140             attributes.setGradientTransform(transform);
    141         }
    142 
    143         if (!attributes.hasStops()) {
    144             const Vector<Gradient::ColorStop>& stops(current->buildStops());
    145             if (!stops.isEmpty())
    146                 attributes.setStops(stops);
    147         }
    148 
    149         if (isLinear) {
    150             SVGLinearGradientElement* linear = toSVGLinearGradientElement(current);
    151 
    152             if (!attributes.hasX1() && current->hasAttribute(SVGNames::x1Attr))
    153                 attributes.setX1(linear->x1CurrentValue());
    154 
    155             if (!attributes.hasY1() && current->hasAttribute(SVGNames::y1Attr))
    156                 attributes.setY1(linear->y1CurrentValue());
    157 
    158             if (!attributes.hasX2() && current->hasAttribute(SVGNames::x2Attr))
    159                 attributes.setX2(linear->x2CurrentValue());
    160 
    161             if (!attributes.hasY2() && current->hasAttribute(SVGNames::y2Attr))
    162                 attributes.setY2(linear->y2CurrentValue());
    163         }
    164 
    165         processedGradients.add(current);
    166 
    167         // Respect xlink:href, take attributes from referenced element
    168         Node* refNode = SVGURIReference::targetElementFromIRIString(current->hrefCurrentValue(), document());
    169         if (refNode && (refNode->hasTagName(SVGNames::linearGradientTag) || refNode->hasTagName(SVGNames::radialGradientTag))) {
    170             current = toSVGGradientElement(refNode);
    171 
    172             // Cycle detection
    173             if (processedGradients.contains(current)) {
    174                 current = 0;
    175                 break;
    176             }
    177 
    178             isLinear = current->hasTagName(SVGNames::linearGradientTag);
    179         } else
    180             current = 0;
    181     }
    182 
    183     return true;
    184 }
    185 
    186 bool SVGLinearGradientElement::selfHasRelativeLengths() const
    187 {
    188     return x1CurrentValue().isRelative()
    189         || y1CurrentValue().isRelative()
    190         || x2CurrentValue().isRelative()
    191         || y2CurrentValue().isRelative();
    192 }
    193 
    194 }
    195