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      1 /*
      2  * Copyright (C) 2006 Oliver Hunt <oliver (at) 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 
     28 namespace blink {
     29 
     30 template<> 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 
     42 inline 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 
     57 DEFINE_NODE_FACTORY(SVGFEDisplacementMapElement)
     58 
     59 bool 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 
     72 void 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 
     97 bool 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 
    111 void 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 
    133 PassRefPtr<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