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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2005 Eric Seidel <eric (at) webkit.org>
      5  * Copyright (C) 2009 Dirk Schulze <krit (at) webkit.org>
      6  * Copyright (C) 2010 Renata Hodovan <reni (at) inf.u-szeged.hu>
      7  * Copyright (C) 2013 Google Inc. All rights reserved.
      8  *
      9  * This library is free software; you can redistribute it and/or
     10  * modify it under the terms of the GNU Library General Public
     11  * License as published by the Free Software Foundation; either
     12  * version 2 of the License, or (at your option) any later version.
     13  *
     14  * This library is distributed in the hope that it will be useful,
     15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     17  * Library General Public License for more details.
     18  *
     19  * You should have received a copy of the GNU Library General Public License
     20  * along with this library; see the file COPYING.LIB.  If not, write to
     21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     22  * Boston, MA 02110-1301, USA.
     23  */
     24 
     25 #ifndef FETurbulence_h
     26 #define FETurbulence_h
     27 
     28 #include "core/platform/graphics/filters/Filter.h"
     29 #include "core/platform/graphics/filters/FilterEffect.h"
     30 
     31 namespace WebCore {
     32 
     33 enum TurbulenceType {
     34     FETURBULENCE_TYPE_UNKNOWN = 0,
     35     FETURBULENCE_TYPE_FRACTALNOISE = 1,
     36     FETURBULENCE_TYPE_TURBULENCE = 2
     37 };
     38 
     39 class FETurbulence : public FilterEffect {
     40 public:
     41     static PassRefPtr<FETurbulence> create(Filter*, TurbulenceType, float, float, int, float, bool);
     42 
     43     TurbulenceType type() const;
     44     bool setType(TurbulenceType);
     45 
     46     float baseFrequencyY() const;
     47     bool setBaseFrequencyY(float);
     48 
     49     float baseFrequencyX() const;
     50     bool setBaseFrequencyX(float);
     51 
     52     float seed() const;
     53     bool setSeed(float);
     54 
     55     int numOctaves() const;
     56     bool setNumOctaves(int);
     57 
     58     bool stitchTiles() const;
     59     bool setStitchTiles(bool);
     60 
     61     static void fillRegionWorker(void*);
     62 
     63     virtual void determineAbsolutePaintRect() { setAbsolutePaintRect(enclosingIntRect(maxEffectRect())); }
     64 
     65     virtual TextStream& externalRepresentation(TextStream&, int indention) const;
     66 
     67 private:
     68     static const int s_blockSize = 256;
     69     static const int s_blockMask = s_blockSize - 1;
     70 
     71     static const int s_minimalRectDimension = (100 * 100); // Empirical data limit for parallel jobs.
     72 
     73     struct PaintingData {
     74         PaintingData(long paintingSeed, const IntSize& paintingSize)
     75             : seed(paintingSeed)
     76             , filterSize(paintingSize)
     77         {
     78         }
     79 
     80         long seed;
     81         int latticeSelector[2 * s_blockSize + 2];
     82         float gradient[4][2 * s_blockSize + 2][2];
     83         IntSize filterSize;
     84 
     85         inline long random();
     86     };
     87 
     88     struct StitchData {
     89         StitchData()
     90             : width(0)
     91             , wrapX(0)
     92             , height(0)
     93             , wrapY(0)
     94         {
     95         }
     96 
     97         int width; // How much to subtract to wrap for stitching.
     98         int wrapX; // Minimum value to wrap.
     99         int height;
    100         int wrapY;
    101     };
    102 
    103     template<typename Type>
    104     friend class ParallelJobs;
    105 
    106     struct FillRegionParameters {
    107         FETurbulence* filter;
    108         Uint8ClampedArray* pixelArray;
    109         PaintingData* paintingData;
    110         int startY;
    111         int endY;
    112         float baseFrequencyX;
    113         float baseFrequencyY;
    114     };
    115 
    116     static void fillRegionWorker(FillRegionParameters*);
    117 
    118     FETurbulence(Filter*, TurbulenceType, float, float, int, float, bool);
    119 
    120     virtual void applySoftware() OVERRIDE;
    121     virtual bool applySkia() OVERRIDE;
    122     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
    123     SkShader* createShader(const IntRect& filterRegion);
    124 
    125     inline void initPaint(PaintingData&);
    126     float noise2D(int channel, PaintingData&, StitchData&, const FloatPoint&);
    127     unsigned char calculateTurbulenceValueForPoint(int channel, PaintingData&, StitchData&, const FloatPoint&, float, float);
    128     inline void fillRegion(Uint8ClampedArray*, PaintingData&, int, int, float, float);
    129 
    130     TurbulenceType m_type;
    131     float m_baseFrequencyX;
    132     float m_baseFrequencyY;
    133     int m_numOctaves;
    134     float m_seed;
    135     bool m_stitchTiles;
    136 };
    137 
    138 } // namespace WebCore
    139 
    140 #endif // FETurbulence_h
    141