1/*
2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
3 * Copyright (C) 2013 Google Inc. All rights reserved.
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#ifndef SourceAlpha_h
22#define SourceAlpha_h
23
24#include "platform/graphics/filters/Filter.h"
25#include "platform/graphics/filters/FilterEffect.h"
26
27namespace blink {
28
29class PLATFORM_EXPORT SourceAlpha : public FilterEffect {
30public:
31    static PassRefPtr<SourceAlpha> create(Filter*);
32
33    static const AtomicString& effectName();
34
35    virtual FloatRect determineAbsolutePaintRect(const FloatRect& requestedRect) OVERRIDE;
36
37    virtual FilterEffectType filterEffectType() const OVERRIDE { return FilterEffectTypeSourceInput; }
38
39    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
40    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
41
42private:
43    SourceAlpha(Filter* filter)
44        : FilterEffect(filter)
45    {
46    }
47
48    virtual void applySoftware() OVERRIDE;
49};
50
51} // namespace blink
52
53#endif // SourceAlpha_h
54