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) 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/SVGGradientElement.h"
25
26#include "core/XLinkNames.h"
27#include "core/dom/Attribute.h"
28#include "core/dom/ElementTraversal.h"
29#include "core/rendering/svg/RenderSVGPath.h"
30#include "core/rendering/svg/RenderSVGResourceLinearGradient.h"
31#include "core/rendering/svg/RenderSVGResourceRadialGradient.h"
32#include "core/svg/SVGStopElement.h"
33#include "core/svg/SVGTransformList.h"
34
35namespace blink {
36
37template<> const SVGEnumerationStringEntries& getStaticStringEntries<SVGSpreadMethodType>()
38{
39    DEFINE_STATIC_LOCAL(SVGEnumerationStringEntries, entries, ());
40    if (entries.isEmpty()) {
41        entries.append(std::make_pair(SVGSpreadMethodPad, "pad"));
42        entries.append(std::make_pair(SVGSpreadMethodReflect, "reflect"));
43        entries.append(std::make_pair(SVGSpreadMethodRepeat, "repeat"));
44    }
45    return entries;
46}
47
48SVGGradientElement::SVGGradientElement(const QualifiedName& tagName, Document& document)
49    : SVGElement(tagName, document)
50    , SVGURIReference(this)
51    , m_gradientTransform(SVGAnimatedTransformList::create(this, SVGNames::gradientTransformAttr, SVGTransformList::create()))
52    , m_spreadMethod(SVGAnimatedEnumeration<SVGSpreadMethodType>::create(this, SVGNames::spreadMethodAttr, SVGSpreadMethodPad))
53    , m_gradientUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::gradientUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX))
54{
55    addToPropertyMap(m_gradientTransform);
56    addToPropertyMap(m_spreadMethod);
57    addToPropertyMap(m_gradientUnits);
58}
59
60bool SVGGradientElement::isSupportedAttribute(const QualifiedName& attrName)
61{
62    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
63    if (supportedAttributes.isEmpty()) {
64        SVGURIReference::addSupportedAttributes(supportedAttributes);
65        supportedAttributes.add(SVGNames::gradientUnitsAttr);
66        supportedAttributes.add(SVGNames::gradientTransformAttr);
67        supportedAttributes.add(SVGNames::spreadMethodAttr);
68    }
69    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
70}
71
72void SVGGradientElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
73{
74    parseAttributeNew(name, value);
75}
76
77void SVGGradientElement::svgAttributeChanged(const QualifiedName& attrName)
78{
79    if (!isSupportedAttribute(attrName)) {
80        SVGElement::svgAttributeChanged(attrName);
81        return;
82    }
83
84    SVGElement::InvalidationGuard invalidationGuard(this);
85
86    RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
87    if (renderer)
88        renderer->invalidateCacheAndMarkForLayout();
89}
90
91void SVGGradientElement::childrenChanged(const ChildrenChange& change)
92{
93    SVGElement::childrenChanged(change);
94
95    if (change.byParser)
96        return;
97
98    if (RenderObject* object = renderer())
99        object->setNeedsLayoutAndFullPaintInvalidation();
100}
101
102Vector<Gradient::ColorStop> SVGGradientElement::buildStops()
103{
104    Vector<Gradient::ColorStop> stops;
105
106    float previousOffset = 0.0f;
107    for (SVGStopElement* stop = Traversal<SVGStopElement>::firstChild(*this); stop; stop = Traversal<SVGStopElement>::nextSibling(*stop)) {
108        // Figure out right monotonic offset
109        float offset = stop->offset()->currentValue()->value();
110        offset = std::min(std::max(previousOffset, offset), 1.0f);
111        previousOffset = offset;
112
113        stops.append(Gradient::ColorStop(offset, stop->stopColorIncludingOpacity()));
114    }
115
116    return stops;
117}
118
119}
120