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
26#if ENABLE(SVG)
27#include "SVGLinearGradientElement.h"
28
29#include "Attribute.h"
30#include "Document.h"
31#include "FloatPoint.h"
32#include "LinearGradientAttributes.h"
33#include "RenderSVGResourceLinearGradient.h"
34#include "SVGLength.h"
35#include "SVGNames.h"
36#include "SVGTransform.h"
37#include "SVGTransformList.h"
38#include "SVGUnitTypes.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
48inline SVGLinearGradientElement::SVGLinearGradientElement(const QualifiedName& tagName, Document* document)
49    : SVGGradientElement(tagName, document)
50    , m_x1(LengthModeWidth)
51    , m_y1(LengthModeHeight)
52    , m_x2(LengthModeWidth, "100%")
53    , m_y2(LengthModeHeight)
54{
55    // Spec: If the x2 attribute is not specified, the effect is as if a value of "100%" were specified.
56}
57
58PassRefPtr<SVGLinearGradientElement> SVGLinearGradientElement::create(const QualifiedName& tagName, Document* document)
59{
60    return adoptRef(new SVGLinearGradientElement(tagName, document));
61}
62
63void SVGLinearGradientElement::parseMappedAttribute(Attribute* attr)
64{
65    if (attr->name() == SVGNames::x1Attr)
66        setX1BaseValue(SVGLength(LengthModeWidth, attr->value()));
67    else if (attr->name() == SVGNames::y1Attr)
68        setY1BaseValue(SVGLength(LengthModeHeight, attr->value()));
69    else if (attr->name() == SVGNames::x2Attr)
70        setX2BaseValue(SVGLength(LengthModeWidth, attr->value()));
71    else if (attr->name() == SVGNames::y2Attr)
72        setY2BaseValue(SVGLength(LengthModeHeight, attr->value()));
73    else
74        SVGGradientElement::parseMappedAttribute(attr);
75}
76
77void SVGLinearGradientElement::svgAttributeChanged(const QualifiedName& attrName)
78{
79    SVGGradientElement::svgAttributeChanged(attrName);
80
81    if (attrName == SVGNames::x1Attr
82        || attrName == SVGNames::y1Attr
83        || attrName == SVGNames::x2Attr
84        || attrName == SVGNames::y2Attr) {
85        updateRelativeLengthsInformation();
86
87        RenderObject* object = renderer();
88        if (!object)
89            return;
90
91        object->setNeedsLayout(true);
92    }
93}
94
95void SVGLinearGradientElement::synchronizeProperty(const QualifiedName& attrName)
96{
97    SVGGradientElement::synchronizeProperty(attrName);
98
99    if (attrName == anyQName()) {
100        synchronizeX1();
101        synchronizeY1();
102        synchronizeX2();
103        synchronizeY2();
104        return;
105    }
106
107    if (attrName == SVGNames::x1Attr)
108        synchronizeX1();
109    else if (attrName == SVGNames::y1Attr)
110        synchronizeY1();
111    else if (attrName == SVGNames::x2Attr)
112        synchronizeX2();
113    else if (attrName == SVGNames::y2Attr)
114        synchronizeY2();
115}
116
117AttributeToPropertyTypeMap& SVGLinearGradientElement::attributeToPropertyTypeMap()
118{
119    DEFINE_STATIC_LOCAL(AttributeToPropertyTypeMap, s_attributeToPropertyTypeMap, ());
120    return s_attributeToPropertyTypeMap;
121}
122
123void SVGLinearGradientElement::fillAttributeToPropertyTypeMap()
124{
125    AttributeToPropertyTypeMap& attributeToPropertyTypeMap = this->attributeToPropertyTypeMap();
126
127    SVGGradientElement::fillPassedAttributeToPropertyTypeMap(attributeToPropertyTypeMap);
128    attributeToPropertyTypeMap.set(SVGNames::x1Attr, AnimatedLength);
129    attributeToPropertyTypeMap.set(SVGNames::y1Attr, AnimatedLength);
130    attributeToPropertyTypeMap.set(SVGNames::x2Attr, AnimatedLength);
131    attributeToPropertyTypeMap.set(SVGNames::y2Attr, AnimatedLength);
132}
133
134RenderObject* SVGLinearGradientElement::createRenderer(RenderArena* arena, RenderStyle*)
135{
136    return new (arena) RenderSVGResourceLinearGradient(this);
137}
138
139void SVGLinearGradientElement::collectGradientAttributes(LinearGradientAttributes& attributes)
140{
141    HashSet<SVGGradientElement*> processedGradients;
142
143    bool isLinear = true;
144    SVGGradientElement* current = this;
145
146    while (current) {
147        if (!attributes.hasSpreadMethod() && current->hasAttribute(SVGNames::spreadMethodAttr))
148            attributes.setSpreadMethod((GradientSpreadMethod) current->spreadMethod());
149
150        if (!attributes.hasBoundingBoxMode() && current->hasAttribute(SVGNames::gradientUnitsAttr))
151            attributes.setBoundingBoxMode(current->gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
152
153        if (!attributes.hasGradientTransform() && current->hasAttribute(SVGNames::gradientTransformAttr)) {
154            AffineTransform transform;
155            current->gradientTransform().concatenate(transform);
156            attributes.setGradientTransform(transform);
157        }
158
159        if (!attributes.hasStops()) {
160            const Vector<Gradient::ColorStop>& stops(current->buildStops());
161            if (!stops.isEmpty())
162                attributes.setStops(stops);
163        }
164
165        if (isLinear) {
166            SVGLinearGradientElement* linear = static_cast<SVGLinearGradientElement*>(current);
167
168            if (!attributes.hasX1() && current->hasAttribute(SVGNames::x1Attr))
169                attributes.setX1(linear->x1());
170
171            if (!attributes.hasY1() && current->hasAttribute(SVGNames::y1Attr))
172                attributes.setY1(linear->y1());
173
174            if (!attributes.hasX2() && current->hasAttribute(SVGNames::x2Attr))
175                attributes.setX2(linear->x2());
176
177            if (!attributes.hasY2() && current->hasAttribute(SVGNames::y2Attr))
178                attributes.setY2(linear->y2());
179        }
180
181        processedGradients.add(current);
182
183        // Respect xlink:href, take attributes from referenced element
184        Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href()));
185        if (refNode && (refNode->hasTagName(SVGNames::linearGradientTag) || refNode->hasTagName(SVGNames::radialGradientTag))) {
186            current = static_cast<SVGGradientElement*>(refNode);
187
188            // Cycle detection
189            if (processedGradients.contains(current)) {
190                current = 0;
191                break;
192            }
193
194            isLinear = current->hasTagName(SVGNames::linearGradientTag);
195        } else
196            current = 0;
197    }
198}
199
200void SVGLinearGradientElement::calculateStartEndPoints(const LinearGradientAttributes& attributes, FloatPoint& startPoint, FloatPoint& endPoint)
201{
202    // Determine gradient start/end points
203    if (attributes.boundingBoxMode()) {
204        startPoint = FloatPoint(attributes.x1().valueAsPercentage(), attributes.y1().valueAsPercentage());
205        endPoint = FloatPoint(attributes.x2().valueAsPercentage(), attributes.y2().valueAsPercentage());
206    } else {
207        startPoint = FloatPoint(attributes.x1().value(this), attributes.y1().value(this));
208        endPoint = FloatPoint(attributes.x2().value(this), attributes.y2().value(this));
209    }
210}
211
212bool SVGLinearGradientElement::selfHasRelativeLengths() const
213{
214    return x1().isRelative()
215        || y1().isRelative()
216        || x2().isRelative()
217        || y2().isRelative();
218}
219
220}
221
222#endif // ENABLE(SVG)
223