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/*****************************************************************************/
// Copyright 2006 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_1d_function.cpp#1 $ */
/* $DateTime: 2012/05/30 13:28:51 $ */
/* $Change: 832332 $ */
/* $Author: tknoll $ */
/*****************************************************************************/
#include "dng_1d_function.h"
#include "dng_utils.h"
/*****************************************************************************/
dng_1d_function::~dng_1d_function ()
{
}
/*****************************************************************************/
bool dng_1d_function::IsIdentity () const
{
return false;
}
/*****************************************************************************/
real64 dng_1d_function::EvaluateInverse (real64 y) const
{
const uint32 kMaxIterations = 30;
const real64 kNearZero = 1.0e-10;
real64 x0 = 0.0;
real64 y0 = Evaluate (x0);
real64 x1 = 1.0;
real64 y1 = Evaluate (x1);
for (uint32 iteration = 0; iteration < kMaxIterations; iteration++)
{
if (Abs_real64 (y1 - y0) < kNearZero)
{
break;
}
real64 x2 = Pin_real64 (0.0,
x1 + (y - y1) * (x1 - x0) / (y1 - y0),
1.0);
real64 y2 = Evaluate (x2);
x0 = x1;
y0 = y1;
x1 = x2;
y1 = y2;
}
return x1;
}
/*****************************************************************************/
bool dng_1d_identity::IsIdentity () const
{
return true;
}
/*****************************************************************************/
real64 dng_1d_identity::Evaluate (real64 x) const
{
return x;
}
/*****************************************************************************/
real64 dng_1d_identity::EvaluateInverse (real64 x) const
{
return x;
}
/*****************************************************************************/
const dng_1d_function & dng_1d_identity::Get ()
{
static dng_1d_identity static_function;
return static_function;
}
/*****************************************************************************/
dng_1d_concatenate::dng_1d_concatenate (const dng_1d_function &function1,
const dng_1d_function &function2)
: fFunction1 (function1)
, fFunction2 (function2)
{
}
/*****************************************************************************/
bool dng_1d_concatenate::IsIdentity () const
{
return fFunction1.IsIdentity () &&
fFunction2.IsIdentity ();
}
/*****************************************************************************/
real64 dng_1d_concatenate::Evaluate (real64 x) const
{
real64 y = Pin_real64 (0.0, fFunction1.Evaluate (x), 1.0);
return fFunction2.Evaluate (y);
}
/*****************************************************************************/
real64 dng_1d_concatenate::EvaluateInverse (real64 x) const
{
real64 y = fFunction2.EvaluateInverse (x);
return fFunction1.EvaluateInverse (y);
}
/*****************************************************************************/
dng_1d_inverse::dng_1d_inverse (const dng_1d_function &f)
: fFunction (f)
{
}
/*****************************************************************************/
bool dng_1d_inverse::IsIdentity () const
{
return fFunction.IsIdentity ();
}
/*****************************************************************************/
real64 dng_1d_inverse::Evaluate (real64 x) const
{
return fFunction.EvaluateInverse (x);
}
/*****************************************************************************/
real64 dng_1d_inverse::EvaluateInverse (real64 y) const
{
return fFunction.Evaluate (y);
}
/*****************************************************************************/
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