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

   1 /*
   2  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2004, 2005, 2006 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/SVGFEMergeElement.h"
  24
  25 #include "core/SVGNames.h"
  26 #include "core/dom/ElementTraversal.h"
  27 #include "core/svg/SVGFEMergeNodeElement.h"
  28 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
  29 #include "platform/graphics/filters/FilterEffect.h"
  30
  31 namespace blink {
  32
  33 inline SVGFEMergeElement::SVGFEMergeElement(Document& document)
  34     : SVGFilterPrimitiveStandardAttributes(SVGNames::feMergeTag, document)
  35 {
  36 }
  37
  38 DEFINE_NODE_FACTORY(SVGFEMergeElement)
  39
  40 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEMergeElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
  41 {
  42     RefPtrWillBeRawPtr<FilterEffect> effect = FEMerge::create(filter);
  43     FilterEffectVector& mergeInputs = effect->inputEffects();
  44     for (SVGFEMergeNodeElement* element = Traversal<SVGFEMergeNodeElement>::firstChild(*this); element; element = Traversal<SVGFEMergeNodeElement>::nextSibling(*element)) {
  45         FilterEffect* mergeEffect = filterBuilder->getEffectById(AtomicString(element->in1()->currentValue()->value()));
  46         if (!mergeEffect)
  47             return nullptr;
  48         mergeInputs.append(mergeEffect);
  49     }
  50
  51     if (mergeInputs.isEmpty())
  52         return nullptr;
  53
  54     return effect.release();
  55 }
  56
  57 }