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#if ENABLE(SVG) && ENABLE(FILTERS)
24#include "SVGFEMergeElement.h"
25
26#include "FilterEffect.h"
27#include "SVGFEMergeNodeElement.h"
28#include "SVGFilterBuilder.h"
29#include "SVGNames.h"
30
31namespace WebCore {
32
33inline SVGFEMergeElement::SVGFEMergeElement(const QualifiedName& tagName, Document* document)
34    : SVGFilterPrimitiveStandardAttributes(tagName, document)
35{
36    ASSERT(hasTagName(SVGNames::feMergeTag));
37}
38
39PassRefPtr<SVGFEMergeElement> SVGFEMergeElement::create(const QualifiedName& tagName, Document* document)
40{
41    return adoptRef(new SVGFEMergeElement(tagName, document));
42}
43
44PassRefPtr<FilterEffect> SVGFEMergeElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
45{
46    RefPtr<FilterEffect> effect = FEMerge::create(filter);
47    FilterEffectVector& mergeInputs = effect->inputEffects();
48    for (Node* node = firstChild(); node; node = node->nextSibling()) {
49        if (node->hasTagName(SVGNames::feMergeNodeTag)) {
50            FilterEffect* mergeEffect = filterBuilder->getEffectById(static_cast<SVGFEMergeNodeElement*>(node)->in1());
51            if (!mergeEffect)
52                return 0;
53            mergeInputs.append(mergeEffect);
54        }
55    }
56
57    if (mergeInputs.isEmpty())
58        return 0;
59
60    return effect.release();
61}
62
63}
64
65#endif // ENABLE(SVG)
66