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      1 /*
      2  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
      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 #include "core/svg/SVGFEDropShadowElement.h"
     22 
     23 #include "core/SVGNames.h"
     24 #include "core/rendering/RenderObject.h"
     25 #include "core/rendering/style/RenderStyle.h"
     26 #include "core/rendering/style/SVGRenderStyle.h"
     27 #include "core/svg/SVGParserUtilities.h"
     28 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
     29 
     30 namespace blink {
     31 
     32 inline SVGFEDropShadowElement::SVGFEDropShadowElement(Document& document)
     33     : SVGFilterPrimitiveStandardAttributes(SVGNames::feDropShadowTag, document)
     34     , m_dx(SVGAnimatedNumber::create(this, SVGNames::dxAttr, SVGNumber::create(2)))
     35     , m_dy(SVGAnimatedNumber::create(this, SVGNames::dyAttr, SVGNumber::create(2)))
     36     , m_stdDeviation(SVGAnimatedNumberOptionalNumber::create(this, SVGNames::stdDeviationAttr, 2, 2))
     37     , m_in1(SVGAnimatedString::create(this, SVGNames::inAttr, SVGString::create()))
     38 {
     39     addToPropertyMap(m_dx);
     40     addToPropertyMap(m_dy);
     41     addToPropertyMap(m_stdDeviation);
     42     addToPropertyMap(m_in1);
     43 }
     44 
     45 DEFINE_NODE_FACTORY(SVGFEDropShadowElement)
     46 
     47 void SVGFEDropShadowElement::setStdDeviation(float x, float y)
     48 {
     49     stdDeviationX()->baseValue()->setValue(x);
     50     stdDeviationY()->baseValue()->setValue(y);
     51     invalidate();
     52 }
     53 
     54 bool SVGFEDropShadowElement::isSupportedAttribute(const QualifiedName& attrName)
     55 {
     56     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     57     if (supportedAttributes.isEmpty()) {
     58         supportedAttributes.add(SVGNames::inAttr);
     59         supportedAttributes.add(SVGNames::dxAttr);
     60         supportedAttributes.add(SVGNames::dyAttr);
     61         supportedAttributes.add(SVGNames::stdDeviationAttr);
     62     }
     63     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
     64 }
     65 
     66 void SVGFEDropShadowElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     67 {
     68     parseAttributeNew(name, value);
     69 }
     70 
     71 void SVGFEDropShadowElement::svgAttributeChanged(const QualifiedName& attrName)
     72 {
     73     if (!isSupportedAttribute(attrName)) {
     74         SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
     75         return;
     76     }
     77 
     78     SVGElement::InvalidationGuard invalidationGuard(this);
     79 
     80     if (attrName == SVGNames::inAttr
     81         || attrName == SVGNames::stdDeviationAttr
     82         || attrName == SVGNames::dxAttr
     83         || attrName == SVGNames::dyAttr) {
     84         invalidate();
     85         return;
     86     }
     87 
     88     ASSERT_NOT_REACHED();
     89 }
     90 
     91 PassRefPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
     92 {
     93     RenderObject* renderer = this->renderer();
     94     if (!renderer)
     95         return nullptr;
     96 
     97     if (stdDeviationX()->currentValue()->value() < 0 || stdDeviationY()->currentValue()->value() < 0)
     98         return nullptr;
     99 
    100     ASSERT(renderer->style());
    101     const SVGRenderStyle& svgStyle = renderer->style()->svgStyle();
    102 
    103     Color color = svgStyle.floodColor();
    104     float opacity = svgStyle.floodOpacity();
    105 
    106     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
    107     if (!input1)
    108         return nullptr;
    109 
    110     RefPtr<FilterEffect> effect = FEDropShadow::create(filter, stdDeviationX()->currentValue()->value(), stdDeviationY()->currentValue()->value(), m_dx->currentValue()->value(), m_dy->currentValue()->value(), color, opacity);
    111     effect->inputEffects().append(input1);
    112     return effect.release();
    113 }
    114 
    115 } // namespace blink
    116