corrade-vassal – Rev 1

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/// <summary>**************************************************************************
/// 
/// $Id: LookUpTable8Interp.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 8 bit lut
        /// 
        /// </summary>
        /// <version>   1.0
        /// </version>
        /// <author>    Bruce A.Kern
        /// </author>
        public class LookUpTable8Interp:LookUpTable8
        {
                
                /// <summary> Construct the lut from the curve data</summary>
                /// <oaram>   curve the data </oaram>
                /// <oaram>   dwNumInput the lut size </oaram>
                /// <oaram>   dwMaxOutput the lut max value </oaram>
                public LookUpTable8Interp(ICCCurveType curve, int dwNumInput, byte dwMaxOutput):base(curve, dwNumInput, dwMaxOutput)
                {
                        
                        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
                        double dfOut; // Output LUT value
                        
                        dfRatio = (double) (curve.count - 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)
                                        dfOut = ICCCurveType.CurveToDouble(curve.entry(dwLowIndex));
                                else
                                {
                                        dfLow = ICCCurveType.CurveToDouble(curve.entry(dwLowIndex));
                                        dfHigh = ICCCurveType.CurveToDouble(curve.entry(dwHighIndex));
                                        dfOut = dfLow + (dfHigh - dfLow) * (dfTargetIndex - dfLowIndex);
                                }
                                
                                //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] = (byte) System.Math.Floor(dfOut * dwMaxOutput + 0.5);
                        }
                }
                
                /* end class LookUpTable8Interp */
        }
}

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