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/*
* Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
* Copyright (C) 2005 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) 2010 Renata Hodovan <reni@inf.u-szeged.hu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef FETurbulence_h
#define FETurbulence_h
#if ENABLE(FILTERS)
#include "FilterEffect.h"
#include "Filter.h"
namespace WebCore {
enum TurbulanceType {
FETURBULENCE_TYPE_UNKNOWN = 0,
FETURBULENCE_TYPE_FRACTALNOISE = 1,
FETURBULENCE_TYPE_TURBULENCE = 2
};
class FETurbulence : public FilterEffect {
public:
static PassRefPtr<FETurbulence> create(TurbulanceType, float, float, int, float, bool);
TurbulanceType type() const;
void setType(TurbulanceType);
float baseFrequencyY() const;
void setBaseFrequencyY(float);
float baseFrequencyX() const;
void setBaseFrequencyX(float);
float seed() const;
void setSeed(float);
int numOctaves() const;
void setNumOctaves(bool);
bool stitchTiles() const;
void setStitchTiles(bool);
virtual void apply(Filter*);
virtual void dump();
virtual void determineAbsolutePaintRect(Filter*) { setAbsolutePaintRect(maxEffectRect()); }
virtual TextStream& externalRepresentation(TextStream&, int indention) const;
private:
static const int s_blockSize = 256;
static const int s_blockMask = s_blockSize - 1;
struct PaintingData {
long seed;
int latticeSelector[2 * s_blockSize + 2];
float gradient[4][2 * s_blockSize + 2][2];
int width; // How much to subtract to wrap for stitching.
int height;
int wrapX; // Minimum value to wrap.
int wrapY;
int channel;
IntSize filterSize;
PaintingData(long paintingSeed, const IntSize& paintingSize);
inline long random();
};
FETurbulence(TurbulanceType, float, float, int, float, bool);
inline void initPaint(PaintingData&);
float noise2D(PaintingData&, const FloatPoint&);
unsigned char calculateTurbulenceValueForPoint(PaintingData&, const FloatPoint&);
TurbulanceType m_type;
float m_baseFrequencyX;
float m_baseFrequencyY;
int m_numOctaves;
float m_seed;
bool m_stitchTiles;
};
} // namespace WebCore
#endif // ENABLE(FILTERS)
#endif // FETurbulence_h
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