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 FEGaussianBlur_h
24#define FEGaussianBlur_h
25
26#include "platform/graphics/filters/Filter.h"
27#include "platform/graphics/filters/FilterEffect.h"
28
29namespace WebCore {
30
31class PLATFORM_EXPORT FEGaussianBlur : public FilterEffect {
32public:
33    static PassRefPtr<FEGaussianBlur> create(Filter*, float, float);
34
35    float stdDeviationX() const;
36    void setStdDeviationX(float);
37
38    float stdDeviationY() const;
39    void setStdDeviationY(float);
40
41    virtual FloatRect mapRect(const FloatRect&, bool forward = true) OVERRIDE FINAL;
42    virtual FloatRect determineAbsolutePaintRect(const FloatRect& requestedRect) OVERRIDE;
43    static IntSize calculateKernelSize(Filter*, const FloatPoint& std);
44    static IntSize calculateUnscaledKernelSize(const FloatPoint& std);
45
46    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
47
48private:
49    static const int s_minimalRectDimension = 100 * 100; // Empirical data limit for parallel jobs
50
51    template<typename Type>
52    friend class ParallelJobs;
53
54    struct PlatformApplyParameters {
55        FEGaussianBlur* filter;
56        RefPtr<Uint8ClampedArray> srcPixelArray;
57        RefPtr<Uint8ClampedArray> dstPixelArray;
58        int width;
59        int height;
60        unsigned kernelSizeX;
61        unsigned kernelSizeY;
62    };
63
64    FEGaussianBlur(Filter*, float, float);
65
66    virtual void applySoftware() OVERRIDE;
67
68    virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
69
70    float m_stdX;
71    float m_stdY;
72};
73
74} // namespace WebCore
75
76#endif // FEGaussianBlur_h
77