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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 blink {
     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     addToPropertyMap(m_x);
     48     addToPropertyMap(m_y);
     49     addToPropertyMap(m_width);
     50     addToPropertyMap(m_height);
     51     addToPropertyMap(m_patternTransform);
     52     addToPropertyMap(m_patternUnits);
     53     addToPropertyMap(m_patternContentUnits);
     54 }
     55 
     56 DEFINE_NODE_FACTORY(SVGPatternElement)
     57 
     58 bool SVGPatternElement::isSupportedAttribute(const QualifiedName& attrName)
     59 {
     60     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     61     if (supportedAttributes.isEmpty()) {
     62         SVGURIReference::addSupportedAttributes(supportedAttributes);
     63         SVGTests::addSupportedAttributes(supportedAttributes);
     64         SVGFitToViewBox::addSupportedAttributes(supportedAttributes);
     65         supportedAttributes.add(SVGNames::patternUnitsAttr);
     66         supportedAttributes.add(SVGNames::patternContentUnitsAttr);
     67         supportedAttributes.add(SVGNames::patternTransformAttr);
     68         supportedAttributes.add(SVGNames::xAttr);
     69         supportedAttributes.add(SVGNames::yAttr);
     70         supportedAttributes.add(SVGNames::widthAttr);
     71         supportedAttributes.add(SVGNames::heightAttr);
     72     }
     73     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     74 }
     75 
     76 void SVGPatternElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     77 {
     78     SVGParsingError parseError = NoError;
     79 
     80     if (!isSupportedAttribute(name)) {
     81         SVGElement::parseAttribute(name, value);
     82     } else if (name == SVGNames::patternUnitsAttr) {
     83         m_patternUnits->setBaseValueAsString(value, parseError);
     84     } else if (name == SVGNames::patternContentUnitsAttr) {
     85         m_patternContentUnits->setBaseValueAsString(value, parseError);
     86     } else if (name == SVGNames::patternTransformAttr) {
     87         m_patternTransform->setBaseValueAsString(value, parseError);
     88     } else if (name == SVGNames::xAttr) {
     89         m_x->setBaseValueAsString(value, parseError);
     90     } else if (name == SVGNames::yAttr) {
     91         m_y->setBaseValueAsString(value, parseError);
     92     } else if (name == SVGNames::widthAttr) {
     93         m_width->setBaseValueAsString(value, parseError);
     94     } else if (name == SVGNames::heightAttr) {
     95         m_height->setBaseValueAsString(value, parseError);
     96     } else if (SVGURIReference::parseAttribute(name, value, parseError)) {
     97     } else if (SVGTests::parseAttribute(name, value)) {
     98     } else if (SVGFitToViewBox::parseAttribute(name, value, document(), parseError)) {
     99     } else {
    100         ASSERT_NOT_REACHED();
    101     }
    102 
    103     reportAttributeParsingError(parseError, name, value);
    104 }
    105 
    106 void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName)
    107 {
    108     if (!isSupportedAttribute(attrName)) {
    109         SVGElement::svgAttributeChanged(attrName);
    110         return;
    111     }
    112 
    113     SVGElement::InvalidationGuard invalidationGuard(this);
    114 
    115     if (attrName == SVGNames::xAttr
    116         || attrName == SVGNames::yAttr
    117         || attrName == SVGNames::widthAttr
    118         || attrName == SVGNames::heightAttr)
    119         updateRelativeLengthsInformation();
    120 
    121     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
    122     if (renderer)
    123         renderer->invalidateCacheAndMarkForLayout();
    124 }
    125 
    126 void SVGPatternElement::childrenChanged(const ChildrenChange& change)
    127 {
    128     SVGElement::childrenChanged(change);
    129 
    130     if (change.byParser)
    131         return;
    132 
    133     if (RenderObject* object = renderer())
    134         object->setNeedsLayoutAndFullPaintInvalidation();
    135 }
    136 
    137 RenderObject* SVGPatternElement::createRenderer(RenderStyle*)
    138 {
    139     return new RenderSVGResourcePattern(this);
    140 }
    141 
    142 static void setPatternAttributes(const SVGPatternElement* element, PatternAttributes& attributes)
    143 {
    144     if (!attributes.hasX() && element->x()->isSpecified())
    145         attributes.setX(element->x()->currentValue());
    146 
    147     if (!attributes.hasY() && element->y()->isSpecified())
    148         attributes.setY(element->y()->currentValue());
    149 
    150     if (!attributes.hasWidth() && element->width()->isSpecified())
    151         attributes.setWidth(element->width()->currentValue());
    152 
    153     if (!attributes.hasHeight() && element->height()->isSpecified())
    154         attributes.setHeight(element->height()->currentValue());
    155 
    156     if (!attributes.hasViewBox() && element->viewBox()->isSpecified() && element->viewBox()->currentValue()->isValid())
    157         attributes.setViewBox(element->viewBox()->currentValue()->value());
    158 
    159     if (!attributes.hasPreserveAspectRatio() && element->preserveAspectRatio()->isSpecified())
    160         attributes.setPreserveAspectRatio(element->preserveAspectRatio()->currentValue());
    161 
    162     if (!attributes.hasPatternUnits() && element->patternUnits()->isSpecified())
    163         attributes.setPatternUnits(element->patternUnits()->currentValue()->enumValue());
    164 
    165     if (!attributes.hasPatternContentUnits() && element->patternContentUnits()->isSpecified())
    166         attributes.setPatternContentUnits(element->patternContentUnits()->currentValue()->enumValue());
    167 
    168     if (!attributes.hasPatternTransform() && element->patternTransform()->isSpecified()) {
    169         AffineTransform transform;
    170         element->patternTransform()->currentValue()->concatenate(transform);
    171         attributes.setPatternTransform(transform);
    172     }
    173 
    174     if (!attributes.hasPatternContentElement() && ElementTraversal::firstWithin(*element))
    175         attributes.setPatternContentElement(element);
    176 }
    177 
    178 void SVGPatternElement::collectPatternAttributes(PatternAttributes& attributes) const
    179 {
    180     WillBeHeapHashSet<RawPtrWillBeMember<const SVGPatternElement> > processedPatterns;
    181     const SVGPatternElement* current = this;
    182 
    183     while (true) {
    184         setPatternAttributes(current, attributes);
    185         processedPatterns.add(current);
    186 
    187         // Respect xlink:href, take attributes from referenced element
    188         Node* refNode = SVGURIReference::targetElementFromIRIString(current->hrefString(), treeScope());
    189         if (isSVGPatternElement(refNode)) {
    190             current = toSVGPatternElement(refNode);
    191 
    192             // Cycle detection
    193             if (processedPatterns.contains(current))
    194                 return;
    195         } else {
    196             return;
    197         }
    198     }
    199 
    200     ASSERT_NOT_REACHED();
    201 }
    202 
    203 AffineTransform SVGPatternElement::localCoordinateSpaceTransform(SVGElement::CTMScope) const
    204 {
    205     AffineTransform matrix;
    206     m_patternTransform->currentValue()->concatenate(matrix);
    207     return matrix;
    208 }
    209 
    210 bool SVGPatternElement::selfHasRelativeLengths() const
    211 {
    212     return m_x->currentValue()->isRelative()
    213         || m_y->currentValue()->isRelative()
    214         || m_width->currentValue()->isRelative()
    215         || m_height->currentValue()->isRelative();
    216 }
    217 
    218 } // namespace blink
    219