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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 "platform/graphics/filters/Filter.h"
     29 #include "platform/graphics/filters/FilterEffect.h"
     30 
     31 namespace blink {
     32 
     33 enum TurbulenceType {
     34     FETURBULENCE_TYPE_UNKNOWN = 0,
     35     FETURBULENCE_TYPE_FRACTALNOISE = 1,
     36     FETURBULENCE_TYPE_TURBULENCE = 2
     37 };
     38 
     39 class PLATFORM_EXPORT 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 TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
     64 
     65 private:
     66     static const int s_blockSize = 256;
     67     static const int s_blockMask = s_blockSize - 1;
     68 
     69     static const int s_minimalRectDimension = (100 * 100); // Empirical data limit for parallel jobs.
     70 
     71     struct PaintingData {
     72         PaintingData(long paintingSeed, const IntSize& paintingSize)
     73             : seed(paintingSeed)
     74             , filterSize(paintingSize)
     75         {
     76         }
     77 
     78         long seed;
     79         int latticeSelector[2 * s_blockSize + 2];
     80         float gradient[4][2 * s_blockSize + 2][2];
     81         IntSize filterSize;
     82 
     83         inline long random();
     84     };
     85 
     86     struct StitchData {
     87         StitchData()
     88             : width(0)
     89             , wrapX(0)
     90             , height(0)
     91             , wrapY(0)
     92         {
     93         }
     94 
     95         int width; // How much to subtract to wrap for stitching.
     96         int wrapX; // Minimum value to wrap.
     97         int height;
     98         int wrapY;
     99     };
    100 
    101     template<typename Type>
    102     friend class ParallelJobs;
    103 
    104     struct FillRegionParameters {
    105         FETurbulence* filter;
    106         Uint8ClampedArray* pixelArray;
    107         PaintingData* paintingData;
    108         int startY;
    109         int endY;
    110         float baseFrequencyX;
    111         float baseFrequencyY;
    112     };
    113 
    114     static void fillRegionWorker(FillRegionParameters*);
    115 
    116     FETurbulence(Filter*, TurbulenceType, float, float, int, float, bool);
    117 
    118     virtual void applySoftware() OVERRIDE;
    119     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
    120     SkShader* createShader();
    121 
    122     inline void initPaint(PaintingData&);
    123     float noise2D(int channel, PaintingData&, StitchData&, const FloatPoint&);
    124     unsigned char calculateTurbulenceValueForPoint(int channel, PaintingData&, StitchData&, const FloatPoint&, float, float);
    125     inline void fillRegion(Uint8ClampedArray*, PaintingData&, int, int, float, float);
    126 
    127     TurbulenceType m_type;
    128     float m_baseFrequencyX;
    129     float m_baseFrequencyY;
    130     int m_numOctaves;
    131     float m_seed;
    132     bool m_stitchTiles;
    133 };
    134 
    135 } // namespace blink
    136 
    137 #endif // FETurbulence_h
    138