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

#ifndef RGBIMAGE_H
#define RGBIMAGE_H

#include "subWindow.h"

#include <stdlib.h>
#include <string.h>

class floatImage;
class bwImage;

#define R 0
#define G 1
#define B 2

class rgbImage
{
public:
  rgbImage( int w, int h );
  rgbImage( floatImage *srcR, floatImage *srcG, floatImage *srcB,
	    bool scaleFromZeroUp=true );
  rgbImage( unsigned char *data, int w, int h );             // shallow copy
  rgbImage( unsigned char *data, int w, int h, bool deep );  // deep copy
  ~rgbImage();  // deallocates data irrespective of shallow/deep

  
public:
  int getWidth() const   { return width_; }
  int getHeight() const  { return height_; }
  int getSize() const    { return size_; }
  int getMemSize() const { return memSize_; }

  void clampInImage( int &x, int &y );
  
  unsigned char *rawData() const { return data_; }
  
  unsigned char *pixel( int x, int y ) { return &data_[(y*width_+x)*3]; }

  void extractRGBComponents( bwImage *&rImg, bwImage *&gImg, bwImage *&bImg );
  
public:
  void addSquare( int x1, int y1, int x2, int y2,
		  char r, char g, char b, float trans=1.0f,
		  bool checkInBounds=false );
  void addSquare( const subWindow &src,
		  char r, char g, char b, float trans=1.0f,
		  bool checkInBounds=false );
  // line specified by ax+by+c=0
  void addLine( float ax, float by, float c,
		char r, char g, char b, float trans=1.0f,
		int clipXmin=0, int clipYmin=0, int clipXmax=0, int clipYmax=0 );
  void addLineSegment( int x1, int y1, int x2, int y2,
		       char r, char g, char b, float trans=1.0f );

  void paste( int x, int y, rgbImage *src );

  
public:
  // fast gradient (standard technique)
  // (allocates the memory for the floatImages - user should use delete
  //  when finished)
  // Gradient based on pixel instensities ( (R+G+B)/3 )
  void imgGrad( floatImage *&gradImgX, floatImage *&gradImgY );
  // Gradient calculated for each colour component individually
  void imgGrad( floatImage *&compXR, floatImage *&compXG, floatImage *&compXB,
		floatImage *&compYR, floatImage *&compYG, floatImage *&compYB );
  
  // quality gradient (Toulouse's technique)
  // (allocates the memory for the floatImages - user should use delete
  //  when finished)
  // Gradient based on pixel instensities ( (R+G+B)/3 )
  void imgGradToulouse( floatImage *&gradImgX, floatImage *&gradImgY );
  // Gradient calculated for each colour component individually
  void imgGradToulouse(
    floatImage *&compXR, floatImage *&compXG, floatImage *&compXB,
    floatImage *&compYR, floatImage *&compYG, floatImage *&compYB );

  // Harris Corner Detector (takes image gradient as input)
  // computes corner response for each colour individually and then finds
  // the magnitude of the RGB responses at each pixel
  static
  floatImage *harrisCornerDetect(
    floatImage *&compXR, floatImage *&compXG, floatImage *&compXB,
    floatImage *&compYR, floatImage *&compYG, floatImage *&compYB,
    int responseWindow );
  
  floatImage *harrisCornerDetect( int responseWindow );
  floatImage *harrisCornerDetect_T( int responseWindow );


private:
  void gradToulouse( int x, int y, float &grdX, float &grdY, int comp );
  
  
private:
  int width_, height_, size_, memSize_;
  unsigned char *data_;
};

inline
rgbImage::rgbImage( int w, int h )
  : width_(w), height_(h), size_(w*h),
    memSize_(size_*3*sizeof(unsigned char))
{
  data_ = (unsigned char*)malloc(memSize_);
}

inline
rgbImage::rgbImage( unsigned char *data, int w, int h )
  : data_(data), width_(w), height_(h), size_(w*h),
    memSize_(size_*3*sizeof(unsigned char))
{
}

inline
rgbImage::rgbImage( unsigned char *data, int w, int h, bool deep )
  : width_(w), height_(h), size_(w*h),
    memSize_(size_*3*sizeof(unsigned char))
{
  if ( (data_=(unsigned char*)malloc(memSize_))!=0 )
  {
    memcpy( data_, data, memSize_ );
  }
}

inline
rgbImage::~rgbImage()
{
  if ( data_!=0 ) free( data_ );
}

inline void 
rgbImage::clampInImage( int &x, int &y )
{
  if ( x<0 ) x=0;
  else if (x>=width_) x=width_-1;
  if ( y<0 ) y=0;
  else if (y>=height_) y=height_-1;
}

#endif // RGBIMAGE_H
rgbImage.h
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