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+/* ============================================================
+ *
+ * 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
+
+// TQt includes.
+
+#include <tqsize.h>
+
+// Digikam includes.
+
+#include "dimgthreadedfilter.h"
+
+namespace DigikamDistortionFXImagesPlugin
+{
+
+class DistortionFX : public Digikam::DImgThreadedFilter
+{
+
+public:
+
+    DistortionFX(Digikam::DImg *orgImage, TQObject *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 */