corrade-vassal – Rev 1
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/// <summary>**************************************************************************
///
/// $Id: LookUpTableFPInterp.java,v 1.1 2002/07/25 14:56:48 grosbois Exp $
///
/// Copyright Eastman Kodak Company, 343 State Street, Rochester, NY 14650
/// $Date $
/// ***************************************************************************
/// </summary>
using System;
using ICCCurveType = CSJ2K.Icc.Tags.ICCCurveType;
namespace CSJ2K.Icc.Lut
{
/// <summary> An interpolated floating point lut
///
/// </summary>
/// <version> 1.0
/// </version>
/// <author> Bruce A.Kern
/// </author>
public class LookUpTableFPInterp:LookUpTableFP
{
/// <summary> Create an abbreviated string representation of a 16 bit lut.</summary>
/// <returns> the lut as a String
/// </returns>
public override System.String ToString()
{
System.Text.StringBuilder rep = new System.Text.StringBuilder("[LookUpTable32 ").Append(" nentries= " + lut.Length);
return rep.Append("]").ToString();
}
/// <summary> Construct the lut from the curve data</summary>
/// <oaram> curve the data </oaram>
/// <oaram> dwNumInput the lut size </oaram>
public LookUpTableFPInterp(ICCCurveType curve, int dwNumInput):base(curve, dwNumInput)
{
int dwLowIndex, dwHighIndex; // Indices of interpolation points
double dfLowIndex, dfHighIndex; // FP indices of interpolation points
double dfTargetIndex; // Target index into interpolation table
double dfRatio; // Ratio of LUT input points to curve values
double dfLow, dfHigh; // Interpolation values
dfRatio = (double) (curve.nEntries - 1) / (double) (dwNumInput - 1);
for (int i = 0; i < dwNumInput; i++)
{
dfTargetIndex = (double) i * dfRatio;
dfLowIndex = System.Math.Floor(dfTargetIndex);
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
dwLowIndex = (int) dfLowIndex;
dfHighIndex = System.Math.Ceiling(dfTargetIndex);
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
dwHighIndex = (int) dfHighIndex;
if (dwLowIndex == dwHighIndex)
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
lut[i] = (float) ICCCurveType.CurveToDouble(curve.entry(dwLowIndex));
}
else
{
dfLow = ICCCurveType.CurveToDouble(curve.entry(dwLowIndex));
dfHigh = ICCCurveType.CurveToDouble(curve.entry(dwHighIndex));
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
lut[i] = (float) (dfLow + (dfHigh - dfLow) * (dfTargetIndex - dfLowIndex));
}
}
}
/* end class LookUpTableFPInterp */
}
}
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