third_party/WebKit/Source/core/svg/SVGFEDropShadowElement.cpp

   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/layout/LayoutObject.h"
  25 #include "core/style/ComputedStyle.h"
  26 #include "core/style/SVGComputedStyle.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_TRACE(SVGFEDropShadowElement)
  46 {
  47     visitor->trace(m_dx);
  48     visitor->trace(m_dy);
  49     visitor->trace(m_stdDeviation);
  50     visitor->trace(m_in1);
  51     SVGFilterPrimitiveStandardAttributes::trace(visitor);
  52 }
  53
  54 DEFINE_NODE_FACTORY(SVGFEDropShadowElement)
  55
  56 void SVGFEDropShadowElement::setStdDeviation(float x, float y)
  57 {
  58     stdDeviationX()->baseValue()->setValue(x);
  59     stdDeviationY()->baseValue()->setValue(y);
  60     invalidate();
  61 }
  62
  63 void SVGFEDropShadowElement::svgAttributeChanged(const QualifiedName& attrName)
  64 {
  65     if (attrName == SVGNames::inAttr
  66         || attrName == SVGNames::stdDeviationAttr
  67         || attrName == SVGNames::dxAttr
  68         || attrName == SVGNames::dyAttr) {
  69         SVGElement::InvalidationGuard invalidationGuard(this);
  70         invalidate();
  71         return;
  72     }
  73
  74     SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
  75 }
  76
  77 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
  78 {
  79     LayoutObject* layoutObject = this->layoutObject();
  80     if (!layoutObject)
  81         return nullptr;
  82
  83     if (stdDeviationX()->currentValue()->value() < 0 || stdDeviationY()->currentValue()->value() < 0)
  84         return nullptr;
  85
  86     ASSERT(layoutObject->style());
  87     const SVGComputedStyle& svgStyle = layoutObject->style()->svgStyle();
  88
  89     Color color = svgStyle.floodColor();
  90     float opacity = svgStyle.floodOpacity();
  91
  92     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
  93     if (!input1)
  94         return nullptr;
  95
  96     RefPtrWillBeRawPtr<FilterEffect> effect = FEDropShadow::create(filter, stdDeviationX()->currentValue()->value(), stdDeviationY()->currentValue()->value(), m_dx->currentValue()->value(), m_dy->currentValue()->value(), color, opacity);
  97     effect->inputEffects().append(input1);
  98     return effect.release();
  99 }
 100
 101 } // namespace blink