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
31namespace blink {
32
33inline SVGFEMergeElement::SVGFEMergeElement(Document& document)
34    : SVGFilterPrimitiveStandardAttributes(SVGNames::feMergeTag, document)
35{
36}
37
38DEFINE_NODE_FACTORY(SVGFEMergeElement)
39
40PassRefPtr<FilterEffect> SVGFEMergeElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
41{
42    RefPtr<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}
58