/***************************************************************************
 * E-Com Technology Ltd.
 *
 * ECOMPACS DICOM Network Transport Libraries * Version 0.1 Beta
 ***************************************************************************/

#ifndef __IMAGE_LOOKUP_TABLE__
#define __IMAGE_LOOKUP_TABLE__


#pragma warning (disable : 4251)


class RealImage;

class DICOM_API LookupTable
{
public:
	Array <int>	MinForkCalibArray;
	Array <int>	MaxForkCalibArray;

	int			MinForkCalib;		// current min fork position (Calib value)
	int			MaxForkCalib;		// current max fork position (Calib value)

	BOOL		BlackSaturated;		// flag for black saturation
									// The current curve is supposed to be constant 
									// between minSpaceCalib and minForkCalib and between
									// maxForkCalib and maxSpaceCalib and is varying 
									// between minForkCalib and maxForkCalib.
public:
	 LookupTable ();
	 LookupTable ( const LookupTable & LUT);

	 LookupTable (int	minSpaceRaw, 
				 int	maxSpaceRaw, 
				 float	offset, 
				 float	slope, 
				 int	wwCal,		// window width
				 int	wlCal)		// window level
	 {
		 Init (minSpaceRaw, maxSpaceRaw, offset, slope, wwCal, wlCal);
	 }

	~LookupTable ();

public:
	void Init (	int		minSpaceRaw, 
				int		maxSpaceRaw, 
				float	offset, 
				float	slope, 
				int		wwCal,		// window width
				int		wlCal);		// window level

	void AddMinMaxFork (int minForkCal, int maxForkCal)
	{
		if (minForkCal < MinSpaceCalib) minForkCal = MinSpaceCalib;
		else
		if (minForkCal > MaxSpaceCalib) minForkCal = MaxSpaceCalib;

		if (maxForkCal < MinSpaceCalib) maxForkCal = MinSpaceCalib;
		else
		if (maxForkCal > MaxSpaceCalib) maxForkCal = MaxSpaceCalib;

		MinForkCalibArray.Add (minForkCal);
		MaxForkCalibArray.Add (maxForkCal);
	}

	void	SetMinMaxFork (int minForkCal, int maxForkCal)
	{
		if (minForkCal < MinSpaceCalib) minForkCal = MinSpaceCalib;
		else
		if (minForkCal > MaxSpaceCalib) minForkCal = MaxSpaceCalib;

		if (maxForkCal < MinSpaceCalib) maxForkCal = MinSpaceCalib;
		else
		if (maxForkCal > MaxSpaceCalib) maxForkCal = MaxSpaceCalib;

		MinForkCalib = minForkCal;
		MaxForkCalib = maxForkCal;
	}

	int		GetMinSpaceCalib () const { return MinSpaceCalib; }
	int		GetMaxSpaceCalib () const { return MaxSpaceCalib; }
	int		GetMinSpaceRaw ()	const { return MinSpaceRaw; }
	int		GetMaxSpaceRaw ()	const { return MaxSpaceRaw; }
	int		GetImageRangeRaw () const { return ImageRangeRaw; }
	
	float	GetIntercept ()		const { return Intercept; }
	float	GetSlope ()			const { return Slope; }

	//**************************************************************************
	// Purpose: Create and compute the color transformation table that 
	//          translates the real image values into the pixmap ones,
	//          (first apply the min and max, then apply the curve then 
	//          convert it from 256 to 240 color levels). 
	//          The created transformation tab is returned as the result 
	//          of the method.
	//**************************************************************************
	BYTE	*	CreateLookupTable (int depth) const;
	BYTE	*	CreateLookupTableEx (int depth) const;

	//**************************************************************************
	// Name: ComputeCalibratedValue
	//
	// Purpose: Translates from screen value to calibrated value.
	//**************************************************************************
	int ComputeCalibratedValue (int screenValue) const
	{
		return (int) (((((float) (MaxSpaceRaw - MinSpaceRaw) *
					 	 (float) (screenValue) / 255.0) +
						 (float) MinSpaceRaw) * Slope) + Intercept);

	}

	//**************************************************************************
	// Name: ComputeScreenValue
	//
	// Purpose: Translates from calibrated value to screen value.
	//**************************************************************************
	int ComputeScreenValue (int calibratedValue) const
	{
		return (int) (((( (float) calibratedValue - Intercept) / Slope) -
						  (float) MinSpaceRaw) * 255.0 /
						  (float) (MaxSpaceRaw - MinSpaceRaw + 1));
	}

	//**************************************************************************
	// Name: FromRawToCalibrated
	//
	// Purpose: Translates from raw value to calibrated one.
	//**************************************************************************
	int FromRawToCalibrated (int Raw) const
	{
		return (int) (((float) Raw * Slope) + Intercept);
	}

	//**************************************************************************
	// Name: FromCalibratedToRaw
	//
	// Purpose: Translates from Calibrated value to raw one.
	//**************************************************************************
	int FromCalibratedToRaw (int Cal) const
	{
		return (int) (((float) Cal - Intercept) / Slope);
	}

private:
	RealImage * RealImage;

	int			MaxSpaceCalib;		// maximum intensity of the image (Calib value)
	int			MinSpaceCalib;		// minimum intensity of the image (Calib value)

	int			MaxSpaceRaw;		// maximum intensity of the image (Raw value)
	int			MinSpaceRaw;		// minimum intensity of the image (Raw value)

	int         MinSpaceSet;		// min pixel value of the set of images
	int         MaxSpaceSet;		// max pixel value of the set of images

	int			ImageRangeRaw;		// the image dynamic
	
	float		Intercept;			// offset for the real pixel values
	float		Slope;				// factor for real pixel slope

private:
	friend class ImageProcess;
	friend class DICOMImage;
	friend class RealImage;
	friend class RealImage8;
	friend class RealImage16;
	friend class RealImageRGB;
};

#endif