TurboWavelets/OrderWavelet2D.cs

// 
// OrderWavelet2D.cs
//  
// Author:
//       Stefan Moebius
// Date:
//       2016-04-24
// 
// Copyright (c) 2016 Stefan Moebius
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

namespace TurboWavelets
{
    public class OrderWavelet2D : Wavelet2D
    {
        protected const int AllowedMinSize = 2;

        public OrderWavelet2D (int width, int height)
            : base(AllowedMinSize, AllowedMinSize, width, height)
        {   
        }

        public OrderWavelet2D (int width, int height, int minSize)
            : base(minSize, AllowedMinSize, width, height)
        {
        }

        #pragma warning disable 1591 // do not show compiler warnings of the missing descriptions
        override protected void TransformRow (float[,] src, float[,] dst, int y, int length)
        {
            if (length >= AllowedMinSize) {
                int half = length >> 1;
                int offSrc = 0;
                // number of low-pass values
                int numLFValues = half + (length & 1);

                for (int i = 0; i < half; i++) {
                    dst [i, y] = src [offSrc, y];
                    dst [i + numLFValues, y] = src [offSrc + 1, y];
                    offSrc += 2;
                }                           
                if ((length & 1) != 0)
                    dst [numLFValues - 1, y] = src [length - 1, y];
            } else {
                for (int i = 0; i < length; i++)
                    dst [i, y] = src [i, y];
            }
        }

        override protected void TransformCol (float[,] src, float[,] dst, int x, int length)
        {
            if (length >= AllowedMinSize) {
                int half = length >> 1;
                int offSrc = 0;
                // number of low-pass values
                int numLFValues = half + (length & 1);

                for (int i = 0; i < half; i++) {
                    dst [x, i] = src [x, offSrc];
                    dst [x, i + numLFValues] = src [x, offSrc + 1];
                    offSrc += 2;
                }                           
                if ((length & 1) != 0)
                    dst [x, numLFValues - 1] = src [x, length - 1];
            } else {
                for (int i = 0; i < length; i++)
                    dst [x, i] = src [x, i];
            }
        }

        override protected void InvTransformRow (float[,] src, float[,] dst, int y, int length)
        {
            if (length >= AllowedMinSize) {
                int half = length >> 1;
                int offDst = 0;
                // number of low-pass values
                int numLFValues = half + (length & 1);

                for (int i = 0; i < half; i++) {
                    dst [offDst, y] = src [i, y];
                    dst [offDst + 1, y] = src [i + numLFValues, y];
                    offDst += 2;
                }                           
                if ((length & 1) != 0)
                    dst [length - 1, y] = src [numLFValues - 1, y]; 
            } else {
                for (int i = 0; i < length; i++)
                    dst [i, y] = src [i, y];
            }
        }

        override protected void InvTransformCol (float[,] src, float[,] dst, int x, int length)
        {
            if (length >= AllowedMinSize) {
                int half = length >> 1;
                int offDst = 0;
                // number of low-pass values
                int numLFValues = half + (length & 1);

                for (int i = 0; i < half; i++) {
                    dst [x, offDst] = src [x, i];
                    dst [x, offDst + 1] = src [x, i + numLFValues];
                    offDst += 2;
                }                           
                if ((length & 1) != 0)
                    dst [x, length - 1] = src [x, numLFValues - 1]; 
            } else {
                for (int i = 0; i < length; i++)
                    dst [x, i] = src [x, i];
            }
        }
        #pragma warning restore 1591
    }
}