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 Filter_h
22#define Filter_h
23
24#if ENABLE(FILTERS)
25#include "FloatRect.h"
26#include "FloatSize.h"
27#include "ImageBuffer.h"
28#include <wtf/RefCounted.h>
29
30namespace WebCore {
31
32class FilterEffect;
33
34class Filter : public RefCounted<Filter> {
35public:
36    Filter(const AffineTransform& absoluteTransform)
37        : m_absoluteTransform(absoluteTransform)
38        , m_renderingMode(Unaccelerated)
39    { }
40    virtual ~Filter() { }
41
42    void setSourceImage(PassOwnPtr<ImageBuffer> sourceImage) { m_sourceImage = sourceImage; }
43    ImageBuffer* sourceImage() { return m_sourceImage.get(); }
44
45    FloatSize filterResolution() const { return m_filterResolution; }
46    void setFilterResolution(const FloatSize& filterResolution) { m_filterResolution = filterResolution; }
47
48    const AffineTransform& absoluteTransform() const { return m_absoluteTransform; }
49    FloatPoint mapAbsolutePointToLocalPoint(const FloatPoint& point) const { return m_absoluteTransform.inverse().mapPoint(point); }
50
51    RenderingMode renderingMode() const { return m_renderingMode; }
52    void setRenderingMode(RenderingMode renderingMode) { m_renderingMode = renderingMode; }
53
54    virtual float applyHorizontalScale(float value) const { return value * m_filterResolution.width(); }
55    virtual float applyVerticalScale(float value) const { return value * m_filterResolution.height(); }
56
57    virtual FloatRect sourceImageRect() const = 0;
58    virtual FloatRect filterRegion() const = 0;
59
60private:
61    OwnPtr<ImageBuffer> m_sourceImage;
62    FloatSize m_filterResolution;
63    AffineTransform m_absoluteTransform;
64    RenderingMode m_renderingMode;
65};
66
67} // namespace WebCore
68
69#endif // ENABLE(FILTERS)
70
71#endif // Filter_h
72