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 FEMorphology_h
24#define FEMorphology_h
25
26#include "platform/graphics/filters/Filter.h"
27#include "platform/graphics/filters/FilterEffect.h"
28
29namespace blink {
30
31enum MorphologyOperatorType {
32    FEMORPHOLOGY_OPERATOR_UNKNOWN = 0,
33    FEMORPHOLOGY_OPERATOR_ERODE = 1,
34    FEMORPHOLOGY_OPERATOR_DILATE = 2
35};
36
37class PLATFORM_EXPORT FEMorphology : public FilterEffect {
38public:
39    static PassRefPtr<FEMorphology> create(Filter*, MorphologyOperatorType, float radiusX, float radiusY);
40    MorphologyOperatorType morphologyOperator() const;
41    bool setMorphologyOperator(MorphologyOperatorType);
42
43    float radiusX() const;
44    bool setRadiusX(float);
45
46    float radiusY() const;
47    bool setRadiusY(float);
48
49    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
50
51    virtual FloatRect mapRect(const FloatRect&, bool forward = true) OVERRIDE FINAL;
52
53    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
54
55    struct PaintingData {
56        Uint8ClampedArray* srcPixelArray;
57        Uint8ClampedArray* dstPixelArray;
58        int width;
59        int height;
60        int radiusX;
61        int radiusY;
62    };
63
64    static const int s_minimalArea = (300 * 300); // Empirical data limit for parallel jobs
65
66    struct PlatformApplyParameters {
67        FEMorphology* filter;
68        int startY;
69        int endY;
70        PaintingData* paintingData;
71    };
72
73private:
74    FEMorphology(Filter*, MorphologyOperatorType, float radiusX, float radiusY);
75
76    virtual void applySoftware() OVERRIDE;
77
78    MorphologyOperatorType m_type;
79    float m_radiusX;
80    float m_radiusY;
81};
82
83} // namespace blink
84
85#endif // FEMorphology_h
86