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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  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  */
     23 
     24 #ifndef FETurbulence_h
     25 #define FETurbulence_h
     26 
     27 #if ENABLE(FILTERS)
     28 #include "FilterEffect.h"
     29 #include "Filter.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     virtual void apply();
     62     virtual void dump();
     63 
     64     virtual void determineAbsolutePaintRect() { setAbsolutePaintRect(enclosingIntRect(maxEffectRect())); }
     65 
     66     virtual TextStream& externalRepresentation(TextStream&, int indention) const;
     67 
     68 private:
     69     static const int s_blockSize = 256;
     70     static const int s_blockMask = s_blockSize - 1;
     71 
     72     struct PaintingData {
     73         long seed;
     74         int latticeSelector[2 * s_blockSize + 2];
     75         float gradient[4][2 * s_blockSize + 2][2];
     76         int width; // How much to subtract to wrap for stitching.
     77         int height;
     78         int wrapX; // Minimum value to wrap.
     79         int wrapY;
     80         int channel;
     81         IntSize filterSize;
     82 
     83         PaintingData(long paintingSeed, const IntSize& paintingSize);
     84         inline long random();
     85     };
     86 
     87     FETurbulence(Filter*, TurbulenceType, float, float, int, float, bool);
     88 
     89     inline void initPaint(PaintingData&);
     90     float noise2D(PaintingData&, const FloatPoint&);
     91     unsigned char calculateTurbulenceValueForPoint(PaintingData&, const FloatPoint&);
     92 
     93     TurbulenceType m_type;
     94     float m_baseFrequencyX;
     95     float m_baseFrequencyY;
     96     int m_numOctaves;
     97     float m_seed;
     98     bool m_stitchTiles;
     99 };
    100 
    101 } // namespace WebCore
    102 
    103 #endif // ENABLE(FILTERS)
    104 
    105 #endif // FETurbulence_h
    106