src/third_party/WebKit/Source/core/svg/SVGPatternElement.cpp

   1 /*
   2  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@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     parseAttributeNew(name, value);
  79 }
  80
  81 void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName)
  82 {
  83     if (!isSupportedAttribute(attrName)) {
  84         SVGElement::svgAttributeChanged(attrName);
  85         return;
  86     }
  87
  88     SVGElement::InvalidationGuard invalidationGuard(this);
  89
  90     if (attrName == SVGNames::xAttr
  91         || attrName == SVGNames::yAttr
  92         || attrName == SVGNames::widthAttr
  93         || attrName == SVGNames::heightAttr)
  94         updateRelativeLengthsInformation();
  95
  96     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
  97     if (renderer)
  98         renderer->invalidateCacheAndMarkForLayout();
  99 }
 100
 101 void SVGPatternElement::childrenChanged(const ChildrenChange& change)
 102 {
 103     SVGElement::childrenChanged(change);
 104
 105     if (change.byParser)
 106         return;
 107
 108     if (RenderObject* object = renderer())
 109         object->setNeedsLayoutAndFullPaintInvalidation();
 110 }
 111
 112 RenderObject* SVGPatternElement::createRenderer(RenderStyle*)
 113 {
 114     return new RenderSVGResourcePattern(this);
 115 }
 116
 117 static void setPatternAttributes(const SVGPatternElement* element, PatternAttributes& attributes)
 118 {
 119     if (!attributes.hasX() && element->x()->isSpecified())
 120         attributes.setX(element->x()->currentValue());
 121
 122     if (!attributes.hasY() && element->y()->isSpecified())
 123         attributes.setY(element->y()->currentValue());
 124
 125     if (!attributes.hasWidth() && element->width()->isSpecified())
 126         attributes.setWidth(element->width()->currentValue());
 127
 128     if (!attributes.hasHeight() && element->height()->isSpecified())
 129         attributes.setHeight(element->height()->currentValue());
 130
 131     if (!attributes.hasViewBox() && element->viewBox()->isSpecified() && element->viewBox()->currentValue()->isValid())
 132         attributes.setViewBox(element->viewBox()->currentValue()->value());
 133
 134     if (!attributes.hasPreserveAspectRatio() && element->preserveAspectRatio()->isSpecified())
 135         attributes.setPreserveAspectRatio(element->preserveAspectRatio()->currentValue());
 136
 137     if (!attributes.hasPatternUnits() && element->patternUnits()->isSpecified())
 138         attributes.setPatternUnits(element->patternUnits()->currentValue()->enumValue());
 139
 140     if (!attributes.hasPatternContentUnits() && element->patternContentUnits()->isSpecified())
 141         attributes.setPatternContentUnits(element->patternContentUnits()->currentValue()->enumValue());
 142
 143     if (!attributes.hasPatternTransform() && element->patternTransform()->isSpecified()) {
 144         AffineTransform transform;
 145         element->patternTransform()->currentValue()->concatenate(transform);
 146         attributes.setPatternTransform(transform);
 147     }
 148
 149     if (!attributes.hasPatternContentElement() && ElementTraversal::firstWithin(*element))
 150         attributes.setPatternContentElement(element);
 151 }
 152
 153 void SVGPatternElement::collectPatternAttributes(PatternAttributes& attributes) const
 154 {
 155     WillBeHeapHashSet<RawPtrWillBeMember<const SVGPatternElement> > processedPatterns;
 156     const SVGPatternElement* current = this;
 157
 158     while (true) {
 159         setPatternAttributes(current, attributes);
 160         processedPatterns.add(current);
 161
 162         // Respect xlink:href, take attributes from referenced element
 163         Node* refNode = SVGURIReference::targetElementFromIRIString(current->hrefString(), treeScope());
 164         if (isSVGPatternElement(refNode)) {
 165             current = toSVGPatternElement(refNode);
 166
 167             // Cycle detection
 168             if (processedPatterns.contains(current))
 169                 return;
 170         } else {
 171             return;
 172         }
 173     }
 174
 175     ASSERT_NOT_REACHED();
 176 }
 177
 178 AffineTransform SVGPatternElement::localCoordinateSpaceTransform(SVGElement::CTMScope) const
 179 {
 180     AffineTransform matrix;
 181     m_patternTransform->currentValue()->concatenate(matrix);
 182     return matrix;
 183 }
 184
 185 bool SVGPatternElement::selfHasRelativeLengths() const
 186 {
 187     return m_x->currentValue()->isRelative()
 188         || m_y->currentValue()->isRelative()
 189         || m_width->currentValue()->isRelative()
 190         || m_height->currentValue()->isRelative();
 191 }
 192
 193 } // namespace blink