1/*
2 * Copyright (C) 2006 Oliver Hunt <oliver@nerget.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21
22#include "core/svg/SVGFEDisplacementMapElement.h"
23
24#include "core/SVGNames.h"
25#include "platform/graphics/filters/FilterEffect.h"
26#include "core/svg/graphics/filters/SVGFilterBuilder.h"
27
28namespace blink {
29
30template<> const SVGEnumerationStringEntries& getStaticStringEntries<ChannelSelectorType>()
31{
32    DEFINE_STATIC_LOCAL(SVGEnumerationStringEntries, entries, ());
33    if (entries.isEmpty()) {
34        entries.append(std::make_pair(CHANNEL_R, "R"));
35        entries.append(std::make_pair(CHANNEL_G, "G"));
36        entries.append(std::make_pair(CHANNEL_B, "B"));
37        entries.append(std::make_pair(CHANNEL_A, "A"));
38    }
39    return entries;
40}
41
42inline SVGFEDisplacementMapElement::SVGFEDisplacementMapElement(Document& document)
43    : SVGFilterPrimitiveStandardAttributes(SVGNames::feDisplacementMapTag, document)
44    , m_scale(SVGAnimatedNumber::create(this, SVGNames::scaleAttr, SVGNumber::create(0)))
45    , m_in1(SVGAnimatedString::create(this, SVGNames::inAttr, SVGString::create()))
46    , m_in2(SVGAnimatedString::create(this, SVGNames::in2Attr, SVGString::create()))
47    , m_xChannelSelector(SVGAnimatedEnumeration<ChannelSelectorType>::create(this, SVGNames::xChannelSelectorAttr, CHANNEL_A))
48    , m_yChannelSelector(SVGAnimatedEnumeration<ChannelSelectorType>::create(this, SVGNames::yChannelSelectorAttr, CHANNEL_A))
49{
50    addToPropertyMap(m_scale);
51    addToPropertyMap(m_in1);
52    addToPropertyMap(m_in2);
53    addToPropertyMap(m_xChannelSelector);
54    addToPropertyMap(m_yChannelSelector);
55}
56
57DEFINE_NODE_FACTORY(SVGFEDisplacementMapElement)
58
59bool SVGFEDisplacementMapElement::isSupportedAttribute(const QualifiedName& attrName)
60{
61    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
62    if (supportedAttributes.isEmpty()) {
63        supportedAttributes.add(SVGNames::inAttr);
64        supportedAttributes.add(SVGNames::in2Attr);
65        supportedAttributes.add(SVGNames::xChannelSelectorAttr);
66        supportedAttributes.add(SVGNames::yChannelSelectorAttr);
67        supportedAttributes.add(SVGNames::scaleAttr);
68    }
69    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
70}
71
72void SVGFEDisplacementMapElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
73{
74    if (!isSupportedAttribute(name)) {
75        SVGFilterPrimitiveStandardAttributes::parseAttribute(name, value);
76        return;
77    }
78
79    SVGParsingError parseError = NoError;
80
81    if (name == SVGNames::inAttr)
82        m_in1->setBaseValueAsString(value, parseError);
83    else if (name == SVGNames::in2Attr)
84        m_in2->setBaseValueAsString(value, parseError);
85    else if (name == SVGNames::scaleAttr)
86        m_scale->setBaseValueAsString(value, parseError);
87    else if (name == SVGNames::xChannelSelectorAttr)
88        m_xChannelSelector->setBaseValueAsString(value, parseError);
89    else if (name == SVGNames::yChannelSelectorAttr)
90        m_yChannelSelector->setBaseValueAsString(value, parseError);
91    else
92        ASSERT_NOT_REACHED();
93
94    reportAttributeParsingError(parseError, name, value);
95}
96
97bool SVGFEDisplacementMapElement::setFilterEffectAttribute(FilterEffect* effect, const QualifiedName& attrName)
98{
99    FEDisplacementMap* displacementMap = static_cast<FEDisplacementMap*>(effect);
100    if (attrName == SVGNames::xChannelSelectorAttr)
101        return displacementMap->setXChannelSelector(m_xChannelSelector->currentValue()->enumValue());
102    if (attrName == SVGNames::yChannelSelectorAttr)
103        return displacementMap->setYChannelSelector(m_yChannelSelector->currentValue()->enumValue());
104    if (attrName == SVGNames::scaleAttr)
105        return displacementMap->setScale(m_scale->currentValue()->value());
106
107    ASSERT_NOT_REACHED();
108    return false;
109}
110
111void SVGFEDisplacementMapElement::svgAttributeChanged(const QualifiedName& attrName)
112{
113    if (!isSupportedAttribute(attrName)) {
114        SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
115        return;
116    }
117
118    SVGElement::InvalidationGuard invalidationGuard(this);
119
120    if (attrName == SVGNames::xChannelSelectorAttr || attrName == SVGNames::yChannelSelectorAttr || attrName == SVGNames::scaleAttr) {
121        primitiveAttributeChanged(attrName);
122        return;
123    }
124
125    if (attrName == SVGNames::inAttr || attrName == SVGNames::in2Attr) {
126        invalidate();
127        return;
128    }
129
130    ASSERT_NOT_REACHED();
131}
132
133PassRefPtr<FilterEffect> SVGFEDisplacementMapElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
134{
135    FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
136    FilterEffect* input2 = filterBuilder->getEffectById(AtomicString(m_in2->currentValue()->value()));
137
138    if (!input1 || !input2)
139        return nullptr;
140
141    RefPtr<FilterEffect> effect = FEDisplacementMap::create(filter, m_xChannelSelector->currentValue()->enumValue(), m_yChannelSelector->currentValue()->enumValue(), m_scale->currentValue()->value());
142    FilterEffectVector& inputEffects = effect->inputEffects();
143    inputEffects.reserveCapacity(2);
144    inputEffects.append(input1);
145    inputEffects.append(input2);
146    return effect.release();
147}
148
149} // namespace blink
150