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 #include "core/svg/SVGPatternElement.h"
  24
  25 #include "core/XLinkNames.h"
  26 #include "core/dom/ElementTraversal.h"
  27 #include "core/layout/svg/LayoutSVGResourcePattern.h"
  28 #include "core/svg/PatternAttributes.h"
  29 #include "platform/transforms/AffineTransform.h"
  30
  31 namespace blink {
  32
  33 inline SVGPatternElement::SVGPatternElement(Document& document)
  34     : SVGElement(SVGNames::patternTag, document)
  35     , SVGURIReference(this)
  36     , SVGTests(this)
  37     , SVGFitToViewBox(this)
  38     , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
  39     , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
  40     , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(SVGLengthMode::Width), ForbidNegativeLengths))
  41     , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(SVGLengthMode::Height), ForbidNegativeLengths))
  42     , m_patternTransform(SVGAnimatedTransformList::create(this, SVGNames::patternTransformAttr, SVGTransformList::create()))
  43     , m_patternUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX))
  44     , m_patternContentUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternContentUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE))
  45 {
  46     addToPropertyMap(m_x);
  47     addToPropertyMap(m_y);
  48     addToPropertyMap(m_width);
  49     addToPropertyMap(m_height);
  50     addToPropertyMap(m_patternTransform);
  51     addToPropertyMap(m_patternUnits);
  52     addToPropertyMap(m_patternContentUnits);
  53 }
  54
  55 DEFINE_TRACE(SVGPatternElement)
  56 {
  57     visitor->trace(m_x);
  58     visitor->trace(m_y);
  59     visitor->trace(m_width);
  60     visitor->trace(m_height);
  61     visitor->trace(m_patternTransform);
  62     visitor->trace(m_patternUnits);
  63     visitor->trace(m_patternContentUnits);
  64     SVGElement::trace(visitor);
  65     SVGURIReference::trace(visitor);
  66     SVGTests::trace(visitor);
  67     SVGFitToViewBox::trace(visitor);
  68 }
  69
  70 DEFINE_NODE_FACTORY(SVGPatternElement)
  71
  72 void SVGPatternElement::svgAttributeChanged(const QualifiedName& attrName)
  73 {
  74     bool isLengthAttr = attrName == SVGNames::xAttr
  75         || attrName == SVGNames::yAttr
  76         || attrName == SVGNames::widthAttr
  77         || attrName == SVGNames::heightAttr;
  78
  79     if (isLengthAttr
  80         || attrName == SVGNames::patternUnitsAttr
  81         || attrName == SVGNames::patternContentUnitsAttr
  82         || attrName == SVGNames::patternTransformAttr
  83         || SVGFitToViewBox::isKnownAttribute(attrName)
  84         || SVGURIReference::isKnownAttribute(attrName)
  85         || SVGTests::isKnownAttribute(attrName)) {
  86         SVGElement::InvalidationGuard invalidationGuard(this);
  87
  88         if (isLengthAttr)
  89             updateRelativeLengthsInformation();
  90
  91         LayoutSVGResourceContainer* layoutObject = toLayoutSVGResourceContainer(this->layoutObject());
  92         if (layoutObject)
  93             layoutObject->invalidateCacheAndMarkForLayout();
  94
  95         return;
  96     }
  97
  98     SVGElement::svgAttributeChanged(attrName);
  99 }
 100
 101 void SVGPatternElement::childrenChanged(const ChildrenChange& change)
 102 {
 103     SVGElement::childrenChanged(change);
 104
 105     if (change.byParser)
 106         return;
 107
 108     if (LayoutObject* object = layoutObject())
 109         object->setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::ChildChanged);
 110 }
 111
 112 LayoutObject* SVGPatternElement::createLayoutObject(const ComputedStyle&)
 113 {
 114     return new LayoutSVGResourcePattern(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
 165         // Only consider attached SVG pattern elements.
 166         if (!isSVGPatternElement(refNode) || !refNode->layoutObject())
 167             break;
 168
 169         current = toSVGPatternElement(refNode);
 170
 171         // Cycle detection
 172         if (processedPatterns.contains(current))
 173             break;
 174     }
 175 }
 176
 177 AffineTransform SVGPatternElement::localCoordinateSpaceTransform(SVGElement::CTMScope) const
 178 {
 179     AffineTransform matrix;
 180     m_patternTransform->currentValue()->concatenate(matrix);
 181     return matrix;
 182 }
 183
 184 bool SVGPatternElement::selfHasRelativeLengths() const
 185 {
 186     return m_x->currentValue()->isRelative()
 187         || m_y->currentValue()->isRelative()
 188         || m_width->currentValue()->isRelative()
 189         || m_height->currentValue()->isRelative();
 190 }
 191
 192 } // namespace blink