source/dng_spline.h

/*****************************************************************************/
// Copyright 2006-2007 Adobe Systems Incorporated
// All Rights Reserved.
//
// NOTICE:  Adobe permits you to use, modify, and distribute this file in
// accordance with the terms of the Adobe license agreement accompanying it.
/*****************************************************************************/

/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_spline.h#1 $ */ 
/* $DateTime: 2012/05/30 13:28:51 $ */
/* $Change: 832332 $ */
/* $Author: tknoll $ */

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#ifndef __dng_spline__
#define __dng_spline__

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#include "dng_1d_function.h"
#include "dng_memory.h"

#include <vector>

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inline real64 EvaluateSplineSegment (real64 x,
								     real64 x0,
								     real64 y0,
								     real64 s0,
								     real64 x1,
								     real64 y1,
								     real64 s1)
	{
	
	real64 A = x1 - x0;

	real64 B = (x - x0) / A;

	real64 C = (x1 - x) / A;

	real64 D = ((y0 * (2.0 - C + B) + (s0 * A * B)) * (C * C)) +
			   ((y1 * (2.0 - B + C) - (s1 * A * C)) * (B * B));
			   
	return D;
	
	}

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class dng_spline_solver: public dng_1d_function
	{
	
	protected:
	
		dng_std_vector<real64> X;
		dng_std_vector<real64> Y;
		
		dng_std_vector<real64> S;
		
	public:
	
		dng_spline_solver ();
		
		virtual ~dng_spline_solver ();
			
		void Reset ();

		void Add (real64 x, real64 y);

		virtual void Solve ();

		virtual bool IsIdentity () const;

		virtual real64 Evaluate (real64 x) const;

	};

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#endif
	
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