/* ============================================================
 *
 * This file is a part of digiKam project
 * http://www.digikam.org
 *
 * Date        : 2005-07-18
 * Description : Distortion FX threaded image filter.
 *
 * Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
 * Copyright (C) 2006-2007 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 *
 * Original Distortion algorithms copyrighted 2004-2005 by 
 * Pieter Z. Voloshyn <pieter dot voloshyn at gmail dot com>.
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option)
 * any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * ============================================================ */
  
#ifndef DISTORTION_FX_H
#define DISTORTION_FX_H

// Qt includes

#include <QSize>

// Local includes

#include "dimgthreadedfilter.h"

namespace DigikamDistortionFXImagesPlugin
{

class DistortionFX : public Digikam::DImgThreadedFilter
{

public:

    DistortionFX(Digikam::DImg *orgImage, QObject *parent=0, int effectType=0,
                 int level=0, int iteration=0, bool antialiasing=true);

    ~DistortionFX(){};

public:

    enum DistortionFXTypes
    {
        FishEye=0,
        Twirl,
        CilindricalHor,
        CilindricalVert,
        CilindricalHV,
        Caricature,
        MultipleCorners,
        WavesHorizontal,
        WavesVertical,
        BlockWaves1,
        BlockWaves2,
        CircularWaves1,
        CircularWaves2,
        PolarCoordinates,
        UnpolarCoordinates,
        Tile
    };

private:

    virtual void filterImage(void);

    // Backported from ImageProcessing version 2
    void fisheye(Digikam::DImg *orgImage, Digikam::DImg *destImage, double Coeff, bool AntiAlias=true);
    void twirl(Digikam::DImg *orgImage, Digikam::DImg *destImage, int Twirl, bool AntiAlias=true);
    void cilindrical(Digikam::DImg *orgImage, Digikam::DImg *destImage, double Coeff, 
                     bool Horizontal, bool Vertical, bool AntiAlias=true);
    void multipleCorners(Digikam::DImg *orgImage, Digikam::DImg *destImage, int Factor, bool AntiAlias=true);
    void polarCoordinates(Digikam::DImg *orgImage, Digikam::DImg *destImage, bool Type, bool AntiAlias=true);
    void circularWaves(Digikam::DImg *orgImage, Digikam::DImg *destImage, int X, int Y, double Amplitude, 
                       double Frequency, double Phase, bool WavesType, bool AntiAlias=true);

    // Backported from ImageProcessing version 1
    void waves(Digikam::DImg *orgImage, Digikam::DImg *destImage, int Amplitude, int Frequency, 
               bool FillSides, bool Direction);
    void blockWaves(Digikam::DImg *orgImage, Digikam::DImg *destImage, int Amplitude, int Frequency, bool Mode);
    void tile(Digikam::DImg *orgImage, Digikam::DImg *destImage, int WSize, int HSize, int Random);

    void setPixelFromOther(int Width, int Height, bool sixteenBit, int bytesDepth,
                           uchar *data, uchar *pResBits,
                           int w, int h, double nw, double nh, bool AntiAlias);
    /*
    //UNUSED

    inline double maximumRadius(int Height, int Width, double Angle);

    // This function does the same thing that ShadeColors function but using double variables.
    inline double proportionalValue (double DestValue, double SrcValue, double Shade)
    {
        if (Shade == 0.0) return DestValue;
        if (Shade == 255.0) return SrcValue;
        return ((DestValue * (255.0 - Shade) + SrcValue * Shade) / 256.0);
    };
    */

    // Return the limit defined the max and min values.
    inline int Lim_Max(int Now, int Up, int Max) 
    {
        --Max;
        while (Now > Max - Up) --Up;
        return (Up);
    };

    inline bool isInside (int Width, int Height, int X, int Y)
    {
        bool bIsWOk = ((X < 0) ? false : (X >= Width ) ? false : true);
        bool bIsHOk = ((Y < 0) ? false : (Y >= Height) ? false : true);
        return (bIsWOk && bIsHOk);
    };

    inline int getOffset(int Width, int X, int Y, int bytesDepth)
    {
        return (Y * Width * bytesDepth) + (X * bytesDepth);
    };

    inline int getOffsetAdjusted(int Width, int Height, int X, int Y, int bytesDepth)
    {
        X = (X < 0) ?  0  :  ((X >= Width ) ? (Width  - 1) : X);
        Y = (Y < 0) ?  0  :  ((Y >= Height) ? (Height - 1) : Y);
        return getOffset(Width, X, Y, bytesDepth);
    };

private:

    bool m_antiAlias;

    int  m_level;
    int  m_iteration;
    int  m_effectType;
};

}  // namespace DigikamDistortionFXImagesPlugin

#endif /* DISTORTION_FX_H */
