WPF Color Picker Construction Kit

using System;
using System.Windows;
using System.Windows.Media;

namespace ColorPicker.ColorModels.Lab
{
 public  sealed class A : NormalComponent 
    {
        private const double D65X = 0.9505;
        private const double D65Y = 1.0;
        private const double D65Z = 1.0890;

        private static LabModel sModel = new LabModel();
        public override bool IsNormalIndependantOfColor
        {
            get { return false; }
        }

        public override void UpdateNormalBitmap(System.Windows.Media.Imaging.WriteableBitmap bitmap, Color color)
        {
            unsafe
            {
                bitmap.Lock();
                int currentPixel = -1;
                byte* pStart = (byte*)(void*)bitmap.BackBuffer;
                double iRowUnit = (double) (MaxValue - MinValue )/bitmap.PixelHeight ;
                double iRowCurrent = 100;
                double l = sModel.LComponent(color);
                double b = sModel.BComponent(color);
                for (int iRow = 0; iRow < bitmap.PixelHeight; iRow++)
                {

                    Color lightness = sModel.Color(l, iRowCurrent, b);
                    for (int iCol = 0; iCol < bitmap.PixelWidth; iCol++)
                    {
                        currentPixel++;
                        *(pStart + currentPixel * 3 + 0) = lightness.B; //Blue
                        *(pStart + currentPixel * 3 + 1) = lightness.G; //Green 
                        *(pStart + currentPixel * 3 + 2) = lightness.R; //red
                    }

                    iRowCurrent -= iRowUnit;

                }

                bitmap.AddDirtyRect(new Int32Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight));
                bitmap.Unlock();
            }
        }

        public override void UpdateColorPlaneBitmap(System.Windows.Media.Imaging.WriteableBitmap bitmap, int normalComponentValue)
        {
            unsafe
            {
                bitmap.Lock();
                byte* pStart = (byte*)(void*)bitmap.BackBuffer;
                int currentPixel = -1;
                double iRowUnit = (double)100/bitmap.PixelHeight ;
                var iColUnit = (double)1;
                double iRowCurrent = 100;


                var a = (double)normalComponentValue;
                for (int iRow = 0; iRow < bitmap.PixelHeight; iRow++)
                {
                    double l = iRowCurrent;
                    double iColCurrent = -128;
                    for (int iCol = 0; iCol < bitmap.PixelWidth; iCol++)
                    {
                        double theta = 6.0 / 29.0;
                        double b = iColCurrent;
                        double fy = (l + 16) / 116.0;
                        double fx = fy + (a / 500.0);
                        double fz = fy - (b / 200.0);

                        var x = (fx > theta) ? D65X * (fx * fx * fx) : (fx - 16.0 / 116.0) * 3 * (theta * theta) * D65X;
                        var y = (fy > theta) ? D65Y * (fy * fy * fy) : (fy - 16.0 / 116.0) * 3 * (theta * theta) * D65Y;
                        var z = (fz > theta) ? D65Z * (fz * fz * fz) : (fz - 16.0 / 116.0) * 3 * (theta * theta) * D65Z;

                        x = (x > 0.9505) ? 0.9505 : ((x < 0) ? 0 : x);
                        y = (y > 1.0) ? 1.0 : ((y < 0) ? 0 : y);
                        z = (z > 1.089) ? 1.089 : ((z < 0) ? 0 : z);

                        double[] Clinear = new double[3];
                        Clinear[0] = x * 3.2410 - y * 1.5374 - z * 0.4986; // red
                        Clinear[1] = -x * 0.9692 + y * 1.8760 - z * 0.0416; // green
                        Clinear[2] = x * 0.0556 - y * 0.2040 + z * 1.0570; // blue

                        for (int i = 0; i < 3; i++)
                        {
                            Clinear[i] = (Clinear[i] <= 0.0031308) ? 12.92 * Clinear[i] : (1 + 0.055) * Math.Pow(Clinear[i], (1.0 / 2.4)) - 0.055;
                            Clinear[i] = Math.Min(Clinear[i], 1);
                            Clinear[i] = Math.Max(Clinear[i], 0);

                        }


                        currentPixel++;
                        *(pStart + currentPixel * 3 + 0) = Convert.ToByte(Clinear[2] * 255); //Blue
                        *(pStart + currentPixel * 3 + 1) = Convert.ToByte(Clinear[1] * 255); //Green 
                        *(pStart + currentPixel * 3 + 2) = Convert.ToByte(Clinear[0] * 255); //red
                        iColCurrent += iColUnit;
                    }
                    iRowCurrent -= iRowUnit;
                }
                bitmap.AddDirtyRect(new Int32Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight));
                bitmap.Unlock();
            }
        }

        public override Color ColorAtPoint(Point selectionPoint, int colorComponentValue)
        {
            var l = (100 - selectionPoint.Y*100/256);
             var a =  colorComponentValue;
            var b =selectionPoint.X - 128;
           
            return sModel.Color(l, a, b);
        }

        public override Point PointFromColor(Color color)
        {
            int x = 128 + Convert.ToInt32(sModel.BComponent(color));
            int y = 100 - Convert.ToInt32(sModel.LComponent(color));
            return new Point(x, y);
        }

        public override int MinValue
        {
            get { return -128; }
        }

        public override int MaxValue
        {
            get { return 127; }
        }

        public override int Value(Color color)
        {
           return Convert.ToInt32( sModel.AComponent( color ));
        }

        public override string Name
        {
            get {return "LAB_A"; }
        }
    }
}