src/third_party/WebKit/Source/core/svg/SVGFEComponentTransferElement.cpp

   1 /*
   2  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public License
  16  * along with this library; see the file COPYING.LIB.  If not, write to
  17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  * Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include "config.h"
  22
  23 #include "core/svg/SVGFEComponentTransferElement.h"
  24
  25 #include "core/SVGNames.h"
  26 #include "core/dom/ElementTraversal.h"
  27 #include "core/svg/SVGFEFuncAElement.h"
  28 #include "core/svg/SVGFEFuncBElement.h"
  29 #include "core/svg/SVGFEFuncGElement.h"
  30 #include "core/svg/SVGFEFuncRElement.h"
  31 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
  32 #include "platform/graphics/filters/FilterEffect.h"
  33
  34 namespace blink {
  35
  36 inline SVGFEComponentTransferElement::SVGFEComponentTransferElement(Document& document)
  37     : SVGFilterPrimitiveStandardAttributes(SVGNames::feComponentTransferTag, document)
  38     , m_in1(SVGAnimatedString::create(this, SVGNames::inAttr, SVGString::create()))
  39 {
  40     addToPropertyMap(m_in1);
  41 }
  42
  43 DEFINE_NODE_FACTORY(SVGFEComponentTransferElement)
  44
  45 bool SVGFEComponentTransferElement::isSupportedAttribute(const QualifiedName& attrName)
  46 {
  47     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
  48     if (supportedAttributes.isEmpty())
  49         supportedAttributes.add(SVGNames::inAttr);
  50     return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
  51 }
  52
  53 void SVGFEComponentTransferElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
  54 {
  55     parseAttributeNew(name, value);
  56 }
  57
  58 PassRefPtr<FilterEffect> SVGFEComponentTransferElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
  59 {
  60     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
  61
  62     if (!input1)
  63         return nullptr;
  64
  65     ComponentTransferFunction red;
  66     ComponentTransferFunction green;
  67     ComponentTransferFunction blue;
  68     ComponentTransferFunction alpha;
  69
  70     for (SVGElement* element = Traversal<SVGElement>::firstChild(*this); element; element = Traversal<SVGElement>::nextSibling(*element)) {
  71         if (isSVGFEFuncRElement(*element))
  72             red = toSVGFEFuncRElement(*element).transferFunction();
  73         else if (isSVGFEFuncGElement(*element))
  74             green = toSVGFEFuncGElement(*element).transferFunction();
  75         else if (isSVGFEFuncBElement(*element))
  76             blue = toSVGFEFuncBElement(*element).transferFunction();
  77         else if (isSVGFEFuncAElement(*element))
  78             alpha = toSVGFEFuncAElement(*element).transferFunction();
  79     }
  80
  81     RefPtr<FilterEffect> effect = FEComponentTransfer::create(filter, red, green, blue, alpha);
  82     effect->inputEffects().append(input1);
  83     return effect.release();
  84 }
  85
  86 }