Rotate90.cs

using System;
 
namespace IdApp.Cv.Transformations.Linear
{
    public static partial class LinearTransformationOperations
    {
        public static Matrix<T> Rotate90<T>(this Matrix<T> M)
            where T : struct
        {
            int w = M.Width;
            int h = M.Height;
            Matrix<T> Result = new(h, w);
            T[] Src = M.Data;
            int SrcIndex;
            int SrcRowSize = M.RowSize;
            T[] Dest = Result.Data;
            int DestIndex = 0;
            int x, y;
 
            for (y = 0; y < w; y++)
            {
                SrcIndex = M.StartIndex(y, h - 1);
                for (x = 0; x < h; x++)
                {
                    Dest[DestIndex++] = Src[SrcIndex];
                    SrcIndex -= SrcRowSize;
                }
            }
 
            return Result;
        }
 
        public static IMatrix Rotate90(this IMatrix M)
        {
            if (M is Matrix<float> M2)
                return M2.Rotate90();
            else if (M is Matrix<int> M3)
                return M3.Rotate90();
            else if (M is Matrix<uint> M4)
                return M4.Rotate90();
            else if (M is Matrix<byte> M5)
                return M5.Rotate90();
            else
                throw new ArgumentException("Unsupported type: " + M.GetType().FullName, nameof(M));
        }
    }
}