1/*
2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2013 Google Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23#ifndef FEDisplacementMap_h
24#define FEDisplacementMap_h
25
26#include "platform/graphics/filters/Filter.h"
27#include "platform/graphics/filters/FilterEffect.h"
28#include "wtf/text/WTFString.h"
29
30namespace blink {
31
32enum ChannelSelectorType {
33    CHANNEL_UNKNOWN = 0,
34    CHANNEL_R = 1,
35    CHANNEL_G = 2,
36    CHANNEL_B = 3,
37    CHANNEL_A = 4
38};
39
40class PLATFORM_EXPORT FEDisplacementMap : public FilterEffect {
41public:
42    static PassRefPtr<FEDisplacementMap> create(Filter*, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float);
43
44    ChannelSelectorType xChannelSelector() const;
45    bool setXChannelSelector(const ChannelSelectorType);
46
47    ChannelSelectorType yChannelSelector() const;
48    bool setYChannelSelector(const ChannelSelectorType);
49
50    float scale() const;
51    bool setScale(float);
52
53    virtual void setResultColorSpace(ColorSpace) OVERRIDE;
54    virtual void transformResultColorSpace(FilterEffect*, const int) OVERRIDE;
55
56    virtual FloatRect mapPaintRect(const FloatRect&, bool forward = true) OVERRIDE FINAL;
57
58    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
59
60    FloatRect determineAbsolutePaintRect(const FloatRect& requestedRect) OVERRIDE;
61
62private:
63    FEDisplacementMap(Filter*, ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, float);
64
65    virtual void applySoftware() OVERRIDE;
66
67    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
68
69    ChannelSelectorType m_xChannelSelector;
70    ChannelSelectorType m_yChannelSelector;
71    float m_scale;
72};
73
74} // namespace blink
75
76#endif // FEDisplacementMap_h
77