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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2007, 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/SVGPatternElement.h"
     25 
     26 #include "core/XLinkNames.h"
     27 #include "core/dom/ElementTraversal.h"
     28 #include "core/rendering/svg/RenderSVGResourcePattern.h"
     29 #include "core/svg/PatternAttributes.h"
     30 #include "platform/transforms/AffineTransform.h"
     31 
     32 namespace WebCore {
     33 
     34 inline SVGPatternElement::SVGPatternElement(Document& document)
     35     : SVGElement(SVGNames::patternTag, document)
     36     , SVGURIReference(this)
     37     , SVGTests(this)
     38     , SVGFitToViewBox(this)
     39     , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
     40     , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
     41     , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(LengthModeWidth), ForbidNegativeLengths))
     42     , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(LengthModeHeight), ForbidNegativeLengths))
     43     , m_patternTransform(SVGAnimatedTransformList::create(this, SVGNames::patternTransformAttr, SVGTransformList::create()))
     44     , m_patternUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX))
     45     , m_patternContentUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternContentUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE))
     46 {
     47     ScriptWrappable::init(this);
     48 
     49     addToPropertyMap(m_x);
     50     addToPropertyMap(m_y);
     51     addToPropertyMap(m_width);
     52     addToPropertyMap(m_height);
     53     addToPropertyMap(m_patternTransform);
     54     addToPropertyMap(m_patternUnits);
     55     addToPropertyMap(m_patternContentUnits);
     56 }
     57 
     58 DEFINE_NODE_FACTORY(SVGPatternElement)
     59 
     60 bool SVGPatternElement::isSupportedAttribute(const QualifiedName& attrName)
     61 {
     62     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     63     if (supportedAttributes.isEmpty()) {
     64         SVGURIReference::addSupportedAttributes(supportedAttributes);
     65         SVGTests::addSupportedAttributes(supportedAttributes);
     66         SVGFitToViewBox::addSupportedAttributes(supportedAttributes);
     67         supportedAttributes.add(SVGNames::patternUnitsAttr);
     68         supportedAttributes.add(SVGNames::patternContentUnitsAttr);
     69         supportedAttributes.add(SVGNames::patternTransformAttr);
     70         supportedAttributes.add(SVGNames::xAttr);
     71         supportedAttributes.add(SVGNames::yAttr);
     72         supportedAttributes.add(SVGNames::widthAttr);
     73         supportedAttributes.add(SVGNames::heightAttr);
     74     }
     75     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     76 }
     77 
     78 void SVGPatternElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     79 {
     80     SVGParsingError parseError = NoError;
     81 
     82     if (!isSupportedAttribute(name)) {
     83         SVGElement::parseAttribute(name, value);
     84     } else if (name == SVGNames::patternUnitsAttr) {
     85         m_patternUnits->setBaseValueAsString(value, parseError);
     86     } else if (name == SVGNames::patternContentUnitsAttr) {
     87         m_patternContentUnits->setBaseValueAsString(value, parseError);
     88     } else if (name == SVGNames::patternTransformAttr) {
     89         m_patternTransform->setBaseValueAsString(value, parseError);
     90     } else if (name == SVGNames::xAttr) {
     91         m_x->setBaseValueAsString(value, parseError);
     92     } else if (name == SVGNames::yAttr) {
     93         m_y->setBaseValueAsString(value, parseError);
     94     } else if (name == SVGNames::widthAttr) {
     95         m_width->setBaseValueAsString(value, parseError);
     96     } else if (name == SVGNames::heightAttr) {
     97         m_height->setBaseValueAsString(value, parseError);
     98     } else if (SVGURIReference::parseAttribute(name, value, parseError)) {
     99     } else if (SVGTests::parseAttribute(name, value)) {
    100     } else if (SVGFitToViewBox::parseAttribute(name, value, document(), parseError)) {
    101     } else {
    102         ASSERT_NOT_REACHED();
    103     }
    104 
    105     reportAttributeParsingError(parseError, name, value);
    106 }
    107 
    108 void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName)
    109 {
    110     if (!isSupportedAttribute(attrName)) {
    111         SVGElement::svgAttributeChanged(attrName);
    112         return;
    113     }
    114 
    115     SVGElement::InvalidationGuard invalidationGuard(this);
    116 
    117     if (attrName == SVGNames::xAttr
    118         || attrName == SVGNames::yAttr
    119         || attrName == SVGNames::widthAttr
    120         || attrName == SVGNames::heightAttr)
    121         updateRelativeLengthsInformation();
    122 
    123     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
    124     if (renderer)
    125         renderer->invalidateCacheAndMarkForLayout();
    126 }
    127 
    128 void SVGPatternElement::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->setNeedsLayoutAndFullPaintInvalidation();
    137 }
    138 
    139 RenderObject* SVGPatternElement::createRenderer(RenderStyle*)
    140 {
    141     return new RenderSVGResourcePattern(this);
    142 }
    143 
    144 static void setPatternAttributes(const SVGPatternElement* element, PatternAttributes& attributes)
    145 {
    146     if (!attributes.hasX() && element->x()->isSpecified())
    147         attributes.setX(element->x()->currentValue());
    148 
    149     if (!attributes.hasY() && element->y()->isSpecified())
    150         attributes.setY(element->y()->currentValue());
    151 
    152     if (!attributes.hasWidth() && element->width()->isSpecified())
    153         attributes.setWidth(element->width()->currentValue());
    154 
    155     if (!attributes.hasHeight() && element->height()->isSpecified())
    156         attributes.setHeight(element->height()->currentValue());
    157 
    158     if (!attributes.hasViewBox() && element->viewBox()->isSpecified() && element->viewBox()->currentValue()->isValid())
    159         attributes.setViewBox(element->viewBox()->currentValue()->value());
    160 
    161     if (!attributes.hasPreserveAspectRatio() && element->preserveAspectRatio()->isSpecified())
    162         attributes.setPreserveAspectRatio(element->preserveAspectRatio()->currentValue());
    163 
    164     if (!attributes.hasPatternUnits() && element->patternUnits()->isSpecified())
    165         attributes.setPatternUnits(element->patternUnits()->currentValue()->enumValue());
    166 
    167     if (!attributes.hasPatternContentUnits() && element->patternContentUnits()->isSpecified())
    168         attributes.setPatternContentUnits(element->patternContentUnits()->currentValue()->enumValue());
    169 
    170     if (!attributes.hasPatternTransform() && element->patternTransform()->isSpecified()) {
    171         AffineTransform transform;
    172         element->patternTransform()->currentValue()->concatenate(transform);
    173         attributes.setPatternTransform(transform);
    174     }
    175 
    176     if (!attributes.hasPatternContentElement() && ElementTraversal::firstWithin(*element))
    177         attributes.setPatternContentElement(element);
    178 }
    179 
    180 void SVGPatternElement::collectPatternAttributes(PatternAttributes& attributes) const
    181 {
    182     HashSet<const SVGPatternElement*> processedPatterns;
    183     const SVGPatternElement* current = this;
    184 
    185     while (true) {
    186         setPatternAttributes(current, attributes);
    187         processedPatterns.add(current);
    188 
    189         // Respect xlink:href, take attributes from referenced element
    190         Node* refNode = SVGURIReference::targetElementFromIRIString(current->hrefString(), treeScope());
    191         if (isSVGPatternElement(refNode)) {
    192             current = toSVGPatternElement(refNode);
    193 
    194             // Cycle detection
    195             if (processedPatterns.contains(current))
    196                 return;
    197         } else {
    198             return;
    199         }
    200     }
    201 
    202     ASSERT_NOT_REACHED();
    203 }
    204 
    205 AffineTransform SVGPatternElement::localCoordinateSpaceTransform(SVGElement::CTMScope) const
    206 {
    207     AffineTransform matrix;
    208     m_patternTransform->currentValue()->concatenate(matrix);
    209     return matrix;
    210 }
    211 
    212 bool SVGPatternElement::selfHasRelativeLengths() const
    213 {
    214     return m_x->currentValue()->isRelative()
    215         || m_y->currentValue()->isRelative()
    216         || m_width->currentValue()->isRelative()
    217         || m_height->currentValue()->isRelative();
    218 }
    219 
    220 }
    221