1/* 2 * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org> 3 * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org> 4 * Copyright (C) 2008 Eric Seidel <eric@webkit.org> 5 * Copyright (C) 2008 Dirk Schulze <krit@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#include "SVGLinearGradientElement.h" 26 27#include "Attribute.h" 28#include "Document.h" 29#include "FloatPoint.h" 30#include "LinearGradientAttributes.h" 31#include "RenderSVGResourceLinearGradient.h" 32#include "SVGElementInstance.h" 33#include "SVGLength.h" 34#include "SVGNames.h" 35#include "SVGTransform.h" 36#include "SVGTransformList.h" 37#include "SVGUnitTypes.h" 38#include <wtf/NeverDestroyed.h> 39 40namespace WebCore { 41 42// Animated property definitions 43DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::x1Attr, X1, x1) 44DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::y1Attr, Y1, y1) 45DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::x2Attr, X2, x2) 46DEFINE_ANIMATED_LENGTH(SVGLinearGradientElement, SVGNames::y2Attr, Y2, y2) 47 48BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGLinearGradientElement) 49 REGISTER_LOCAL_ANIMATED_PROPERTY(x1) 50 REGISTER_LOCAL_ANIMATED_PROPERTY(y1) 51 REGISTER_LOCAL_ANIMATED_PROPERTY(x2) 52 REGISTER_LOCAL_ANIMATED_PROPERTY(y2) 53 REGISTER_PARENT_ANIMATED_PROPERTIES(SVGGradientElement) 54END_REGISTER_ANIMATED_PROPERTIES 55 56inline SVGLinearGradientElement::SVGLinearGradientElement(const QualifiedName& tagName, Document& document) 57 : SVGGradientElement(tagName, document) 58 , m_x1(LengthModeWidth) 59 , m_y1(LengthModeHeight) 60 , m_x2(LengthModeWidth, "100%") 61 , m_y2(LengthModeHeight) 62{ 63 // Spec: If the x2 attribute is not specified, the effect is as if a value of "100%" were specified. 64 ASSERT(hasTagName(SVGNames::linearGradientTag)); 65 registerAnimatedPropertiesForSVGLinearGradientElement(); 66} 67 68PassRefPtr<SVGLinearGradientElement> SVGLinearGradientElement::create(const QualifiedName& tagName, Document& document) 69{ 70 return adoptRef(new SVGLinearGradientElement(tagName, document)); 71} 72 73bool SVGLinearGradientElement::isSupportedAttribute(const QualifiedName& attrName) 74{ 75 static NeverDestroyed<HashSet<QualifiedName>> supportedAttributes; 76 if (supportedAttributes.get().isEmpty()) { 77 supportedAttributes.get().add(SVGNames::x1Attr); 78 supportedAttributes.get().add(SVGNames::x2Attr); 79 supportedAttributes.get().add(SVGNames::y1Attr); 80 supportedAttributes.get().add(SVGNames::y2Attr); 81 } 82 return supportedAttributes.get().contains<SVGAttributeHashTranslator>(attrName); 83} 84 85void SVGLinearGradientElement::parseAttribute(const QualifiedName& name, const AtomicString& value) 86{ 87 SVGParsingError parseError = NoError; 88 89 if (!isSupportedAttribute(name)) 90 SVGGradientElement::parseAttribute(name, value); 91 else if (name == SVGNames::x1Attr) 92 setX1BaseValue(SVGLength::construct(LengthModeWidth, value, parseError)); 93 else if (name == SVGNames::y1Attr) 94 setY1BaseValue(SVGLength::construct(LengthModeHeight, value, parseError)); 95 else if (name == SVGNames::x2Attr) 96 setX2BaseValue(SVGLength::construct(LengthModeWidth, value, parseError)); 97 else if (name == SVGNames::y2Attr) 98 setY2BaseValue(SVGLength::construct(LengthModeHeight, value, parseError)); 99 else 100 ASSERT_NOT_REACHED(); 101 102 reportAttributeParsingError(parseError, name, value); 103} 104 105void SVGLinearGradientElement::svgAttributeChanged(const QualifiedName& attrName) 106{ 107 if (!isSupportedAttribute(attrName)) { 108 SVGGradientElement::svgAttributeChanged(attrName); 109 return; 110 } 111 112 SVGElementInstance::InvalidationGuard invalidationGuard(this); 113 114 updateRelativeLengthsInformation(); 115 116 if (RenderObject* object = renderer()) 117 object->setNeedsLayout(); 118} 119 120RenderPtr<RenderElement> SVGLinearGradientElement::createElementRenderer(PassRef<RenderStyle> style) 121{ 122 return createRenderer<RenderSVGResourceLinearGradient>(*this, WTF::move(style)); 123} 124 125static void setGradientAttributes(SVGGradientElement& element, LinearGradientAttributes& attributes, bool isLinear = true) 126{ 127 if (!attributes.hasSpreadMethod() && element.hasAttribute(SVGNames::spreadMethodAttr)) 128 attributes.setSpreadMethod(element.spreadMethod()); 129 130 if (!attributes.hasGradientUnits() && element.hasAttribute(SVGNames::gradientUnitsAttr)) 131 attributes.setGradientUnits(element.gradientUnits()); 132 133 if (!attributes.hasGradientTransform() && element.hasAttribute(SVGNames::gradientTransformAttr)) { 134 AffineTransform transform; 135 element.gradientTransform().concatenate(transform); 136 attributes.setGradientTransform(transform); 137 } 138 139 if (!attributes.hasStops()) { 140 const Vector<Gradient::ColorStop>& stops(element.buildStops()); 141 if (!stops.isEmpty()) 142 attributes.setStops(stops); 143 } 144 145 if (isLinear) { 146 SVGLinearGradientElement* linear = toSVGLinearGradientElement(&element); 147 148 if (!attributes.hasX1() && element.hasAttribute(SVGNames::x1Attr)) 149 attributes.setX1(linear->x1()); 150 151 if (!attributes.hasY1() && element.hasAttribute(SVGNames::y1Attr)) 152 attributes.setY1(linear->y1()); 153 154 if (!attributes.hasX2() && element.hasAttribute(SVGNames::x2Attr)) 155 attributes.setX2(linear->x2()); 156 157 if (!attributes.hasY2() && element.hasAttribute(SVGNames::y2Attr)) 158 attributes.setY2(linear->y2()); 159 } 160} 161 162bool SVGLinearGradientElement::collectGradientAttributes(LinearGradientAttributes& attributes) 163{ 164 if (!renderer()) 165 return false; 166 167 HashSet<SVGGradientElement*> processedGradients; 168 SVGGradientElement* current = this; 169 170 setGradientAttributes(*current, attributes); 171 processedGradients.add(current); 172 173 while (true) { 174 // Respect xlink:href, take attributes from referenced element 175 Node* refNode = SVGURIReference::targetElementFromIRIString(current->href(), document()); 176 if (refNode && isSVGGradientElement(*refNode)) { 177 current = toSVGGradientElement(refNode); 178 179 // Cycle detection 180 if (processedGradients.contains(current)) 181 return true; 182 183 if (!current->renderer()) 184 return false; 185 186 setGradientAttributes(*current, attributes, current->hasTagName(SVGNames::linearGradientTag)); 187 processedGradients.add(current); 188 } else 189 return true; 190 } 191 192 ASSERT_NOT_REACHED(); 193 return false; 194} 195 196bool SVGLinearGradientElement::selfHasRelativeLengths() const 197{ 198 return x1().isRelative() 199 || y1().isRelative() 200 || x2().isRelative() 201 || y2().isRelative(); 202} 203 204} 205