/*
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee 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 3 of the License, or
 *  (at your option) any later version.
 * 
 *  RawTherapee 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _IIMAGE_
#define _IIMAGE_

#include <lcms2.h>
#include <glib/gstdio.h>
#include <glibmm.h>
#include <vector>
#include "../rtgui/threadutils.h"
#include "rt_math.h"
#include "alignedbuffer.h"
#include "imagedimensions.h"
#include "LUT.h"
#include "coord2d.h"
#include "procparams.h"
#include "color.h"
#include "colortemp.h"

#define TR_NONE     0
#define TR_R90      1
#define TR_R180     2
#define TR_R270     3
#define TR_VFLIP    4
#define TR_HFLIP    8
#define TR_ROT      3

namespace rtengine {

    extern const char sImage8[];
    extern const char sImage16[];
    extern const char sImagefloat[];

    class ProgressListener;
    class Color;

    enum TypeInterpolation { TI_Nearest, TI_Bilinear };

    // --------------------------------------------------------------------
    //                       Generic classes
    // --------------------------------------------------------------------

    class ImageDatas : virtual public ImageDimensions {
      public:
        template <class S, class D >
        void convertTo (S srcValue, D &dstValue) {
            dstValue = static_cast<D>(srcValue);
        }

        // parameters that will never be used, replaced by the subclasses r, g and b parameters!
        // they are still necessary to implement operator() in this parent class
        virtual ~ImageDatas() {}
        virtual void allocate (int W, int H) {}
        virtual void rotate (int deg) {}
        // free the memory allocated for the image data without deleting the object.
        virtual void flushData () { allocate(0,0); }

        virtual void hflip () {}
        virtual void vflip () {}

        // Read the raw dump of the data
        void readData  (FILE *fh) {}
        // Write a raw dump of the data
        void writeData (FILE *fh) {}

        virtual void normalizeInt (int srcMinVal, int srcMaxVal) {};
        virtual void normalizeFloat (float srcMinVal, float srcMaxVal) {};
        virtual void computeHistogramAutoWB (double &avg_r, double &avg_g, double &avg_b, int &n, LUTu &histogram, int compression) {}
        virtual void getSpotWBData (double &reds, double &greens, double &blues, int &rn, int &gn, int &bn,
                                    std::vector<Coord2D> &red, std::vector<Coord2D> &green, std::vector<Coord2D> &blue,
                                    int tran) {}
        virtual void getAutoWBMultipliers (double &rm, double &gm, double &bm) { rm=gm=bm=1.0; }
        virtual const char* getType () const { return "unknown"; }

    };

    template <>
    inline void ImageDatas::convertTo<unsigned short, unsigned char> (unsigned short srcValue, unsigned char &dstValue) {
        dstValue = (unsigned char)(srcValue >> 8);
    }
    template <>
    inline void ImageDatas::convertTo<unsigned char, int> (unsigned char srcValue, int &dstValue) {
        dstValue = (int)(srcValue) << 8;
    }
    template <>
    inline void ImageDatas::convertTo<unsigned char, unsigned short> (unsigned char srcValue, unsigned short &dstValue) {
        dstValue = (unsigned short)(srcValue) << 8;
    }
    template <>
    inline void ImageDatas::convertTo<float, unsigned char> (float srcValue, unsigned char &dstValue) {
        dstValue = (unsigned char)( (unsigned short)(srcValue) >> 8 );
    }
    template <>
    inline void ImageDatas::convertTo<unsigned char, float> (unsigned char srcValue, float &dstValue) {
        dstValue = float( (unsigned short)(srcValue) << 8 );
    }

    // --------------------------------------------------------------------
    //                       Planar order classes
    // --------------------------------------------------------------------

    template <class T>
    class PlanarPtr {
      protected:
        AlignedBuffer<T*> ab;
      public:
        T** ptrs;

        PlanarPtr() : ptrs (NULL) {}
        bool resize(int newSize) {
            if (ab.resize(newSize)) {
                ptrs=ab.data;
                return true;
            }
            else {
                ptrs=NULL;
                return false;
            }
        }
        void swap (PlanarPtr<T> &other) {
            ab.swap(other.ab);
            T** tmpsPtrs = other.ptrs;
            other.ptrs = ptrs;
            ptrs = tmpsPtrs;
        }

        T*&       operator() (unsigned row)                     { return ptrs[row]; }
        // Will send back the start of a row, starting with a red, green or blue value
        T*        operator() (unsigned row) const               { return ptrs[row]; }
        // Will send back a value at a given row, col position
        T&        operator() (unsigned row, unsigned col)       { return ptrs[row][col]; }
        const T   operator() (unsigned row, unsigned col) const { return ptrs[row][col]; }
    };

    template <class T>
    class PlanarImageData : virtual public ImageDatas {

      private:
        AlignedBuffer<T> abData;

        int rowstride;    // Plan size, in bytes (all padding bytes included)
        int planestride;  // Row length, in bytes (padding bytes included)

      public:
        T* data;
        PlanarPtr<T> r;
        PlanarPtr<T> g;
        PlanarPtr<T> b;

        PlanarImageData() : rowstride(0), planestride(0), data (NULL) {}
        PlanarImageData(int w, int h) : rowstride(0), planestride(0), data (NULL) {
            allocate(w, h);
        }

        // Send back the row stride. WARNING: unit = byte, not element!
        int getRowStride () { return rowstride; }
        // Send back the plane stride. WARNING: unit = byte, not element!
        int getPlaneStride () { return planestride; }

        void swap(PlanarImageData<T> &other) {
            abData.swap(other.abData);
            r.swap(other.r);
            g.swap(other.g);
            b.swap(other.b);
            T* tmpData = other.data;
            other.data = data;
            data = tmpData;
            int tmpWidth = other.width;
            other.width = width;
            width = tmpWidth;
            int tmpHeight = other.height;
            other.height = height;
            height = tmpHeight;
        }

        // use as pointer to data
        //operator void*() { return data; };

        /* If any of the required allocation fails, "width" and "height" are set to -1, and all remaining buffer are freed
         * Can be safely used to reallocate an existing image */
        void allocate (int W, int H) {

            if (W==width && H==height)
                return;

            width=W;
            height=H;

            if (sizeof(T) > 1) {
                // 128 bits memory alignment for >8bits data
                rowstride = ( width*sizeof(T)+15 )/16*16;
                planestride = rowstride * height;
            }
            else {
                // No memory alignment for 8bits data
                rowstride = width*sizeof(T);
                planestride = rowstride * height;
            }

            // find the padding length to ensure a 128 bits alignment for each row
            size_t size = rowstride * 3*height;

            if (size && abData.resize(size, 1)
                     && r.resize(height)
                     && g.resize(height)
                     && b.resize(height) )
            {
                data   = abData.data;
            }
            else {
                // asking for a new size of 0 is safe and will free memory, if any!
                abData.resize(0);
                r.resize(0);
                g.resize(0);
                b.resize(0);
                width = height = -1;
                return;
            }

            char *redstart   = (char*)(data);
            char *greenstart = (char*)(data) +   planestride;
            char *bluestart  = (char*)(data) + 2*planestride;

            for (int i=0; i<height; ++i) {
                int k = i*rowstride;
                r(i) = (T*)(redstart   + k);
                g(i) = (T*)(greenstart + k);
                b(i) = (T*)(bluestart  + k);
            }
        }

        /** Copy the data to another PlanarImageData */
        void copyData(PlanarImageData<T> *dest) {
            assert (dest!=NULL);
            // Make sure that the size is the same, reallocate if necessary
            dest->allocate(width, height);
            for (int i=0; i<height; i++) {
                memcpy (dest->r(i), r(i), width*sizeof(T));
                memcpy (dest->g(i), g(i), width*sizeof(T));
                memcpy (dest->b(i), b(i), width*sizeof(T));
            }
        }

        void rotate (int deg) {

          if (deg==90) {
            PlanarImageData<T> rotatedImg(height, width);  // New image, rotated

            for (int ny=0; ny<rotatedImg.height; ny++) {
              int ox = ny;
              int oy = height-1;
              for (int nx=0; nx<rotatedImg.width; nx++) {
                rotatedImg.r(ny,nx) = r(oy,ox);
                rotatedImg.g(ny,nx) = g(oy,ox);
                rotatedImg.b(ny,nx) = b(oy,ox);
                --oy;
              }
            }
            swap(rotatedImg);
          }
          else if (deg==270) {
            PlanarImageData<T> rotatedImg(height, width);  // New image, rotated

            for (int nx=0; nx<rotatedImg.width; nx++) {
              int oy = nx;
              int ox = width-1;
              for (int ny=0; ny<rotatedImg.height; ny++) {
                rotatedImg.r(ny,nx) = r(oy,ox);
                rotatedImg.g(ny,nx) = g(oy,ox);
                rotatedImg.b(ny,nx) = b(oy,ox);
                --ox;
              }
            }
            swap(rotatedImg);
          }
          else if (deg==180) {
            int height2 = height/2 + (height & 1);

            #ifdef _OPENMP
            // difficult to find a cutoff value where parallelization is counter productive because of processor's data cache collision...
            bool bigImage = width>32 && height>50;
            #pragma omp parallel for schedule(static) if(bigImage)
            #endif
            for (int i=0; i<height2; i++) {
              for (int j=0; j<width; j++) {
                T tmp;
                int x = width-1-j;
                int y = height-1-i;

                tmp = r(i,j);
                r(i,j) = r(y,x);
                r(y,x) = tmp;

                tmp = g(i,j);
                g(i,j) = g(y,x);
                g(y,x) = tmp;

                tmp = b(i,j);
                b(i,j) = b(y,x);
                b(y,x) = tmp;
              }
            }
          }
        }

        template <class IC>
        void resizeImgTo (int nw, int nh, TypeInterpolation interp, IC *imgPtr) {
            //printf("resizeImgTo: resizing %s image data (%d x %d) to %s (%d x %d)\n", getType(), width, height, imgPtr->getType(), imgPtr->width, imgPtr->height);
            if (interp == TI_Nearest) {
                for (int i=0; i<nh; i++) {
                    int ri = i*height/nh;
                    for (int j=0; j<nw; j++) {
                        int ci = j*width/nw;
                        convertTo(r(ri,ci), imgPtr->r(i,j));
                        convertTo(g(ri,ci), imgPtr->g(i,j));
                        convertTo(b(ri,ci), imgPtr->b(i,j));
                    }
                }
            }
            else if (interp == TI_Bilinear) {
                for (int i=0; i<nh; i++) {
                    int sy = i*height/nh;
                    if (sy>=height) sy = height-1;
                    float dy = float(i)*float(height)/float(nh) - float(sy);
                    int ny = sy+1;
                    if (ny>=height) ny = sy;
                    for (int j=0; j<nw; j++) {
                        int sx = j*width/nw;
                        if (sx>=width) sx = width;
                        float dx = float(j)*float(width)/float(nw) - float(sx);
                        int nx = sx+1;
                        if (nx>=width) nx = sx;
                        convertTo(r(sy,sx)*(1.f-dx)*(1.f-dy) + r(sy,nx)*dx*(1.f-dy) + r(ny,sx)*(1.f-dx)*dy + r(ny,nx)*dx*dy, imgPtr->r(i,j));
                        convertTo(g(sy,sx)*(1.f-dx)*(1.f-dy) + g(sy,nx)*dx*(1.f-dy) + g(ny,sx)*(1.f-dx)*dy + g(ny,nx)*dx*dy, imgPtr->g(i,j));
                        convertTo(b(sy,sx)*(1.f-dx)*(1.f-dy) + b(sy,nx)*dx*(1.f-dy) + b(ny,sx)*(1.f-dx)*dy + b(ny,nx)*dx*dy, imgPtr->b(i,j));
                    }
                }
            }
            else {
                // This case should never occur!
                for (int i=0; i<nh; i++) {
                    for (int j=0; j<nw; j++) {
                        r(i,j) = 0;
                        g(i,j) = 0;
                        b(i,j) = 0;
                    }
                }
            }
        }

        void hflip () {
          int width2 = width/2;

          #ifdef _OPENMP
          // difficult to find a cutoff value where parallelization is counter productive because of processor's data cache collision...
          bool bigImage = width>32 && height>50;
          #pragma omp parallel for schedule(static) if(bigImage)
          #endif
          for (int i=0; i<height; i++)
            for (int j=0; j<width2; j++) {
              float temp;
              int x = width-1-j;

              temp = r(i,j);
              r(i,j) = r(i,x);
              r(i,x) = temp;

              temp = g(i,j);
              g(i,j) = g(i,x);
              g(i,x) = temp;

              temp = b(i,j);
              b(i,j) = b(i,x);
              b(i,x) = temp;
            }
        }

        void vflip () {

          int height2 = height/2;

          #ifdef _OPENMP
          // difficult to find a cutoff value where parallelization is counter productive because of processor's data cache collision...
          bool bigImage = width>32 && height>50;
          #pragma omp parallel for schedule(static) if(bigImage)
          #endif
          for (int i=0; i<height2; i++)
            for (int j=0; j<width; j++) {
              T tempR, tempG, tempB;
              int y = height-1-i;

              tempR = r(i,j);
              r(i,j) = r(y,j);
              r(y,j) = tempR;

              tempG = g(i,j);
              g(i,j) = g(y,j);
              g(y,j) = tempG;

              tempB = b(i,j);
              b(i,j) = b(y,j);
              b(y,j) = tempB;
            }
        }

        void calcGrayscaleHist(unsigned int *hist16) {
        for (int row=0; row<height; row++)
            for (int col=0; col<width; col++) {
                unsigned short rIdx, gIdx, bIdx;
                convertTo(r(row,col), rIdx);
                convertTo(g(row,col), gIdx);
                convertTo(b(row,col), bIdx);
                hist16[rIdx]++;
                hist16[gIdx]+=2;  // Bayer 2x green correction
                hist16[bIdx]++;
            }
        }

        void computeAutoHistogram (LUTu & histogram, int& histcompr) {
            histcompr = 3;

            histogram(65536>>histcompr);
            histogram.clear();

            for (int i=0; i<height; i++)
                for (int j=0; j<width; j++) {
                    float r_, g_, b_;
                    convertTo<T, float>(r(i,j), r_);
                    convertTo<T, float>(g(i,j), g_);
                    convertTo<T, float>(b(i,j), b_);
                    histogram[(int)Color::igamma_srgb (r_)>>histcompr]++;
                    histogram[(int)Color::igamma_srgb (g_)>>histcompr]++;
                    histogram[(int)Color::igamma_srgb (b_)>>histcompr]++;
                }
        }

        void computeHistogramAutoWB (double &avg_r, double &avg_g, double &avg_b, int &n, LUTu &histogram, const int compression) {
            histogram.clear();
            avg_r = avg_g = avg_b = 0.;
            n=0;
            for (unsigned int i=0; i<(unsigned int)(height); i++)
                for (unsigned int j=0; j<(unsigned int)(width); j++) {
                    float r_, g_, b_;
                    convertTo<T, float>(r(i,j), r_);
                    convertTo<T, float>(g(i,j), g_);
                    convertTo<T, float>(b(i,j), b_);
                    int rtemp = Color::igamma_srgb (r_);
                    int gtemp = Color::igamma_srgb (g_);
                    int btemp = Color::igamma_srgb (b_);

                    histogram[rtemp>>compression]++;
                    histogram[gtemp>>compression]+=2;
                    histogram[btemp>>compression]++;

                    // autowb computation
                    if (r_>64000.f || g_>64000.f || b_>64000.f) continue;
                    avg_r += double(r_);
                    avg_g += double(g_);
                    avg_b += double(b_);
                    n++;
                }
        }

        void getAutoWBMultipliers (double &rm, double &gm, double &bm) {

            double avg_r = 0.;
            double avg_g = 0.;
            double avg_b = 0.;
            int n = 0;
            //int p = 6;

            for (unsigned int i=0; i<(unsigned int)(height); i++)
                for (unsigned int j=0; j<(unsigned int)(width); j++) {
                    float r_, g_, b_;
                    convertTo<T, float>(r(i,j), r_);
                    convertTo<T, float>(g(i,j), g_);
                    convertTo<T, float>(b(i,j), b_);

                    if (r_>64000.f || g_>64000.f || b_>64000.f) continue;
                    avg_r += double(r_);
                    avg_g += double(g_);
                    avg_b += double(b_);
                    /*avg_r += intpow( (double)r(i, j), p);
                    avg_g += intpow( (double)g(i, j), p);
                    avg_b += intpow( (double)b(i, j), p);*/
                    n++;
                }
            rm = avg_r/double(n);
            gm = avg_g/double(n);
            bm = avg_b/double(n);
        }

        void transformPixel (int x, int y, int tran, int& tx, int& ty) {

            int W = width;
            int H = height;
            int sw = W, sh = H;
            if ((tran & TR_ROT) == TR_R90 || (tran & TR_ROT) == TR_R270) {
                sw = H;
                sh = W;
            }

            int ppx = x, ppy = y;
            if (tran & TR_HFLIP)
                ppx = sw - 1 - x;
            if (tran & TR_VFLIP)
                ppy = sh - 1 - y;

            tx = ppx;
            ty = ppy;

            if ((tran & TR_ROT) == TR_R180) {
                tx = W - 1 - ppx;
                ty = H - 1 - ppy;
            }
            else if ((tran & TR_ROT) == TR_R90) {
                tx = ppy;
                ty = H - 1 - ppx;
            }
            else if ((tran & TR_ROT) == TR_R270) {
                tx = W - 1 - ppy;
                ty = ppx;
            }
        }

        virtual void getSpotWBData (double &reds, double &greens, double &blues, int &rn, int &gn, int &bn,
                            std::vector<Coord2D> &red, std::vector<Coord2D> &green, std::vector<Coord2D> &blue,
                            int tran)
        {
            int x; int y;
            reds = 0, greens = 0, blues = 0;
            rn = 0, gn = 0, bn = 0;
            for (size_t i=0; i<red.size(); i++) {
                transformPixel (red[i].x, red[i].y, tran, x, y);
                if (x>=0 && y>=0 && x<width && y<height) {
                    float v;
                    convertTo<T, float>(this->r(y, x), v);
                    reds += double(v);
                    rn++;
                }
                transformPixel (green[i].x, green[i].y, tran, x, y);
                if (x>=0 && y>=0 && x<width && y<height) {
                    float v;
                    convertTo<T, float>(this->g(y, x), v);
                    greens += double(v);
                    gn++;
                }
                transformPixel (blue[i].x, blue[i].y, tran, x, y);
                if (x>=0 && y>=0 && x<width && y<height) {
                    float v;
                    convertTo<T, float>(this->b(y, x), v);
                    blues += double(v);
                    bn++;
                }
            }
        }

        void readData   (FILE *f) {
            for (int i=0; i<height; i++)
                fread (r(i), sizeof(T), width, f);
            for (int i=0; i<height; i++)
                fread (g(i), sizeof(T), width, f);
            for (int i=0; i<height; i++)
                fread (b(i), sizeof(T), width, f);
        }

        void writeData  (FILE *f) {
            for (int i=0; i<height; i++)
                fwrite (r(i), sizeof(T), width, f);
            for (int i=0; i<height; i++)
                fwrite (g(i), sizeof(T), width, f);
            for (int i=0; i<height; i++)
                fwrite (b(i), sizeof(T), width, f);
        }

    };

    // --------------------------------------------------------------------
    //                       Chunky order classes
    // --------------------------------------------------------------------

    template <class T>
    class ChunkyPtr {
      private:
        T* ptr;
        int width;
      public:
        ChunkyPtr() : ptr (NULL), width(-1) {}
        void init(T* base, int w=-1) { ptr = base; width=w; }
        void swap (ChunkyPtr<T> &other) {
            T* tmpsPtr = other.ptr;
            other.ptr = ptr;
            ptr = tmpsPtr;

            int tmpWidth = other.width;
            other.width = width;
            width = tmpWidth;
        }

        // Will send back the start of a row, starting with a red, green or blue value
        T* operator() (unsigned row) const { return &ptr[3*(row*width)]; }
        // Will send back a value at a given row, col position
        T& operator() (unsigned row, unsigned col) { return ptr[3*(row*width+col)]; }
        const T  operator() (unsigned row, unsigned col) const { return ptr[3*(row*width+col)]; }
    };

    template <class T>
    class ChunkyImageData : virtual public ImageDatas {

      private:
        AlignedBuffer<T> abData;

      public:
        T* data;
        ChunkyPtr<T> r;
        ChunkyPtr<T> g;
        ChunkyPtr<T> b;

        ChunkyImageData() : data (NULL) {}
        ChunkyImageData(int w, int h) : data (NULL) {
            allocate(w, h);
        }

        /** Returns the pixel data, in r/g/b order from top left to bottom right continuously.
          * @return a pointer to the pixel data */
         const T* getData () { return data; }

         void swap(ChunkyImageData<T> &other) {
             abData.swap(other.abData);
             r.swap(other.r);
             g.swap(other.g);
             b.swap(other.b);
             T* tmpData = other.data;
             other.data = data;
             data = tmpData;
             int tmpWidth = other.width;
             other.width = width;
             width = tmpWidth;
             int tmpHeight = other.height;
             other.height = height;
             height = tmpHeight;
         }

        /*
         * If any of the required allocation fails, "width" and "height" are set to -1, and all remaining buffer are freed
         * Can be safely used to reallocate an existing image or to free up it's memory with "allocate (0,0);"
         */
        void allocate (int W, int H) {

            if (W==width && H==height)
                return;

            width=W;
            height=H;

            if (abData.resize(width*height*3)) {
                data = abData.data;
                r.init(data,   width);
                g.init(data+1, width);
                b.init(data+2, width);
            }
            else {
                data = NULL;
                r.init(NULL);
                g.init(NULL);
                b.init(NULL);
                width = height = -1;
            }
        }

        /** Copy the data to another ChunkyImageData */
        void copyData(ChunkyImageData<T> *dest) {
            assert (dest!=NULL);
            // Make sure that the size is the same, reallocate if necessary
            dest->allocate(width, height);
            memcpy (dest->data, data, 3*width*height*sizeof(T));
        }

        void rotate (int deg) {

          if (deg==90) {
            ChunkyImageData<T> rotatedImg(height, width);  // New image, rotated

            for (int ny=0; ny<rotatedImg.height; ny++) {
              int ox = ny;
              int oy = height-1;
              for (int nx=0; nx<rotatedImg.width; nx++) {
                rotatedImg.r(ny,nx) = r(oy,ox);
                rotatedImg.g(ny,nx) = g(oy,ox);
                rotatedImg.b(ny,nx) = b(oy,ox);
                --oy;
              }
            }
            swap(rotatedImg);
          }
          else if (deg==270) {
            ChunkyImageData<T> rotatedImg(height, width);  // New image, rotated

            for (int nx=0; nx<rotatedImg.width; nx++) {
              int oy = nx;
              int ox = width-1;
              for (int ny=0; ny<rotatedImg.height; ny++) {
                rotatedImg.r(ny,nx) = r(oy,ox);
                rotatedImg.g(ny,nx) = g(oy,ox);
                rotatedImg.b(ny,nx) = b(oy,ox);
                --ox;
              }
            }
            swap(rotatedImg);
          }
          else if (deg==180) {
            int height2 = height/2 + (height & 1);

            // Maybe not sufficiently optimized, but will do what it has to do
            for (int i=0; i<height2; i++) {
              for (int j=0; j<width; j++) {
                T tmp;
                int x = width-1-j;
                int y = height-1-i;

                tmp = r(i,j);
                r(i,j) = r(y,x);
                r(y,x) = tmp;

                tmp = g(i,j);
                g(i,j) = g(y,x);
                g(y,x) = tmp;

                tmp = b(i,j);
                b(i,j) = b(y,x);
                b(y,x) = tmp;
              }
            }
          }
        }

        template <class IC>
        void resizeImgTo (int nw, int nh, TypeInterpolation interp, IC *imgPtr) {
            //printf("resizeImgTo: resizing %s image data (%d x %d) to %s (%d x %d)\n", getType(), width, height, imgPtr->getType(), imgPtr->width, imgPtr->height);
            if (interp == TI_Nearest) {
                for (int i=0; i<nh; i++) {
                    int ri = i*height/nh;
                    for (int j=0; j<nw; j++) {
                        int ci = j*width/nw;
                        convertTo(r(ri,ci), imgPtr->r(i,j));
                        convertTo(g(ri,ci), imgPtr->g(i,j));
                        convertTo(b(ri,ci), imgPtr->b(i,j));
                    }
                }
            }
            else if (interp == TI_Bilinear) {
                for (int i=0; i<nh; i++) {
                    int sy = i*height/nh;
                    if (sy>=height) sy = height-1;
                    float dy = float(i)*float(height)/float(nh) - float(sy);
                    int ny = sy+1;
                    if (ny>=height) ny = sy;
                    for (int j=0; j<nw; j++) {
                        int sx = j*width/nw;
                        if (sx>=width) sx = width;
                        float dx = float(j)*float(width)/float(nw) - float(sx);
                        int nx = sx+1;
                        if (nx>=width) nx = sx;
                        T valR = r(sy,sx)*(1.f-dx)*(1.f-dy) + r(sy,nx)*dx*(1.f-dy) + r(ny,sx)*(1.f-dx)*dy + r(ny,nx)*dx*dy;
                        T valG = g(sy,sx)*(1.f-dx)*(1.f-dy) + g(sy,nx)*dx*(1.f-dy) + g(ny,sx)*(1.f-dx)*dy + g(ny,nx)*dx*dy;
                        T valB = b(sy,sx)*(1.f-dx)*(1.f-dy) + b(sy,nx)*dx*(1.f-dy) + b(ny,sx)*(1.f-dx)*dy + b(ny,nx)*dx*dy;
                        convertTo(valR, imgPtr->r(i,j));
                        convertTo(valG, imgPtr->g(i,j));
                        convertTo(valB, imgPtr->b(i,j));
                    }
                }
            }
            else {
                // This case should never occur!
                for (int i=0; i<nh; i++) {
                    for (int j=0; j<nw; j++) {
                        r(i,j) = 0;
                        g(i,j) = 0;
                        b(i,j) = 0;
                    }
                }
            }
        }

        void hflip () {
          int width2 = width/2;

          for (int i=0; i<height; i++) {
            int offsetBegin = 0;
            int offsetEnd = 3*(width-1);

            for (int j=0; j<width2; j++) {
              T temp;

              temp = data[offsetBegin];
              data[offsetBegin] = data[offsetEnd];
              data[offsetEnd] = temp;

              ++offsetBegin;
              ++offsetEnd;

              temp = data[offsetBegin];
              data[offsetBegin] = data[offsetEnd];
              data[offsetEnd] = temp;

              ++offsetBegin;
              ++offsetEnd;

              temp = data[offsetBegin];
              data[offsetBegin] = data[offsetEnd];
              data[offsetEnd] = temp;

              ++offsetBegin;
              offsetEnd -= 5;

            }
          }
        }

        void vflip () {

            AlignedBuffer<T> lBuffer(3*width);
            T* lineBuffer = lBuffer.data;
            size_t size = 3*width*sizeof(T);
            for (int i=0; i<height/2; i++) {
                T *lineBegin1 = r(i);
                T *lineBegin2 = r(height-1-i);
                memcpy (lineBuffer, lineBegin1, size);
                memcpy (lineBegin1, lineBegin2, size);
                memcpy (lineBegin2, lineBuffer, size);
            }
        }

        void calcGrayscaleHist(unsigned int *hist16) {
        for (int row=0; row<height; row++)
            for (int col=0; col<width; col++) {
                unsigned short rIdx, gIdx, bIdx;
                convertTo(r(row,col), rIdx);
                convertTo(g(row,col), gIdx);
                convertTo(b(row,col), bIdx);
                hist16[rIdx]++;
                hist16[gIdx]+=2;  // Bayer 2x green correction
                hist16[bIdx]++;
            }
        }

        void computeAutoHistogram (LUTu & histogram, int& histcompr) {
            histcompr = 3;

            histogram(65536>>histcompr);
            histogram.clear();

            for (int i=0; i<height; i++)
                for (int j=0; j<width; j++) {
                    float r_, g_, b_;
                    convertTo<T, float>(r(i,j), r_);
                    convertTo<T, float>(g(i,j), g_);
                    convertTo<T, float>(b(i,j), b_);
                    histogram[(int)Color::igamma_srgb (r_)>>histcompr]++;
                    histogram[(int)Color::igamma_srgb (g_)>>histcompr]++;
                    histogram[(int)Color::igamma_srgb (b_)>>histcompr]++;
                }
        }

        void computeHistogramAutoWB (double &avg_r, double &avg_g, double &avg_b, int &n, LUTu &histogram, const int compression) {
            histogram.clear();
            avg_r = avg_g = avg_b = 0.;
            n=0;
            for (unsigned int i=0; i<(unsigned int)(height); i++)
                for (unsigned int j=0; j<(unsigned int)(width); j++) {
                    float r_, g_, b_;
                    convertTo<T, float>(r(i,j), r_);
                    convertTo<T, float>(g(i,j), g_);
                    convertTo<T, float>(b(i,j), b_);
                    int rtemp = Color::igamma_srgb (r_);
                    int gtemp = Color::igamma_srgb (g_);
                    int btemp = Color::igamma_srgb (b_);

                    histogram[rtemp>>compression]++;
                    histogram[gtemp>>compression]+=2;
                    histogram[btemp>>compression]++;

                    // autowb computation
                    if (r_>64000.f || g_>64000.f || b_>64000.f) continue;
                    avg_r += double(r_);
                    avg_g += double(g_);
                    avg_b += double(b_);
                    n++;
                }
        }

        void getAutoWBMultipliers (double &rm, double &gm, double &bm) {

            double avg_r = 0.;
            double avg_g = 0.;
            double avg_b = 0.;
            int n = 0;
            //int p = 6;

            for (unsigned int i=0; i<(unsigned int)(height); i++)
                for (unsigned int j=0; j<(unsigned int)(width); j++) {
                    float r_, g_, b_;
                    convertTo<T, float>(r(i,j), r_);
                    convertTo<T, float>(g(i,j), g_);
                    convertTo<T, float>(b(i,j), b_);

                    if (r_>64000.f || g_>64000.f || b_>64000.f) continue;
                    avg_r += double(r_);
                    avg_g += double(g_);
                    avg_b += double(b_);
                    /*avg_r += intpow( (double)r(i, j), p);
                    avg_g += intpow( (double)g(i, j), p);
                    avg_b += intpow( (double)b(i, j), p);*/
                    n++;
                }
            rm = avg_r/double(n);
            gm = avg_g/double(n);
            bm = avg_b/double(n);
        }

        void transformPixel (int x, int y, int tran, int& tx, int& ty) {

            int W = width;
            int H = height;
            int sw = W, sh = H;
            if ((tran & TR_ROT) == TR_R90 || (tran & TR_ROT) == TR_R270) {
                sw = H;
                sh = W;
            }

            int ppx = x, ppy = y;
            if (tran & TR_HFLIP)
                ppx = sw - 1 - x;
            if (tran & TR_VFLIP)
                ppy = sh - 1 - y;

            tx = ppx;
            ty = ppy;

            if ((tran & TR_ROT) == TR_R180) {
                tx = W - 1 - ppx;
                ty = H - 1 - ppy;
            }
            else if ((tran & TR_ROT) == TR_R90) {
                tx = ppy;
                ty = H - 1 - ppx;
            }
            else if ((tran & TR_ROT) == TR_R270) {
                tx = W - 1 - ppy;
                ty = ppx;
            }
        }

        virtual void getSpotWBData (double &reds, double &greens, double &blues, int &rn, int &gn, int &bn,
                            std::vector<Coord2D> &red, std::vector<Coord2D> &green, std::vector<Coord2D> &blue,
                            int tran)
        {
            int x; int y;
            reds = 0, greens = 0, blues = 0;
            rn = 0, gn = 0, bn = 0;
            for (size_t i=0; i<red.size(); i++) {
                transformPixel (red[i].x, red[i].y, tran, x, y);
                if (x>=0 && y>=0 && x<width && y<height) {
                    float v;
                    convertTo<T, float>(this->r(y, x), v);
                    reds += double(v);
                    rn++;
                }
                transformPixel (green[i].x, green[i].y, tran, x, y);
                if (x>=0 && y>=0 && x<width && y<height) {
                    float v;
                    convertTo<T, float>(this->g(y, x), v);
                    greens += double(v);
                    gn++;
                }
                transformPixel (blue[i].x, blue[i].y, tran, x, y);
                if (x>=0 && y>=0 && x<width && y<height) {
                    float v;
                    convertTo<T, float>(this->b(y, x), v);
                    blues += double(v);
                    bn++;
                }
            }
        }

        void readData   (FILE *f) {
            for (int i=0; i<height; i++)
                fread (r(i), sizeof(T), 3*width, f);
        }

        void writeData  (FILE *f) {
            for (int i=0; i<height; i++)
                fwrite (r(i), sizeof(T), 3*width, f);
        }

    };

    // --------------------------------------------------------------------

  /** This class represents an image (the result of the image processing) */
    class IImage : virtual public ImageDimensions {
      public:

        virtual ~IImage() {}
        /** Returns a mutex that can is useful in many situations. No image operations shuold be performed without locking this mutex.
          * @return The mutex */
            virtual MyMutex& getMutex ()=0;
            virtual cmsHPROFILE getProfile ()=0;
        /** Returns the bits per pixel of the image.
          * @return The bits per pixel of the image */
            virtual int getBitsPerPixel ()=0;
        /** Saves the image to file. It autodetects the format (jpg, tif, png are supported).
          * @param fname is the name of the file 
            @return the error code, 0 if none */
            virtual int saveToFile (Glib::ustring fname)=0;
        /** Saves the image to file in a png format.
          * @param fname is the name of the file 
          * @param compression is the amount of compression (0-6), -1 corresponds to the default
          * @param bps can be 8 or 16 depending on the bits per pixels the output file will have
            @return the error code, 0 if none */
            virtual int saveAsPNG  (Glib::ustring fname, int compression = -1, int bps = -1)=0;
        /** Saves the image to file in a jpg format.
          * @param fname is the name of the file 
          * @param quality is the quality of the jpeg (0...100), set it to -1 to use default
            @return the error code, 0 if none */
            virtual int saveAsJPEG (Glib::ustring fname, int quality = 100, int subSamp = 3 )=0;
        /** Saves the image to file in a tif format.
          * @param fname is the name of the file 
          * @param bps can be 8 or 16 depending on the bits per pixels the output file will have
            @return the error code, 0 if none */
            virtual int saveAsTIFF (Glib::ustring fname, int bps = -1, bool uncompressed = false)=0;
        /** Sets the progress listener if you want to follow the progress of the image saving operations (optional).
          * @param pl is the pointer to the class implementing the ProgressListener interface */
            virtual void setSaveProgressListener (ProgressListener* pl)=0;
        /** Free the image */
            virtual void free ()=0;
    };

  /** This class represents an image having a float pixel planar representation.
    The planes are stored as two dimensional arrays. All the rows have a 128 bits alignment. */
    class IImagefloat : public IImage, public PlanarImageData<float> {
      public:
        virtual ~IImagefloat() {}
    };

    /** This class represents an image having a classical 8 bits/pixel representation */
    class IImage8 : public IImage, public ChunkyImageData<unsigned char> {
      public:
        virtual ~IImage8() {}
    };

  /** This class represents an image having a 16 bits/pixel planar representation.
      The planes are stored as two dimensional arrays. All the rows have a 128 bits alignment. */
    class IImage16 : public IImage, public PlanarImageData<unsigned short> {
      public:
        virtual ~IImage16() {}
    };

}

#endif
