Algorithmix.Preprocessing.Preprocessing.RotateImg C# (CSharp) Method

        public static Bitmap RotateImg(Bitmap bmp, float angle, Color bkColor)
        {
            int w = bmp.Width;
            int h = bmp.Height;
            System.Drawing.Imaging.PixelFormat pf = default(System.Drawing.Imaging.PixelFormat);
            if (bkColor == Color.Transparent)
            {
                pf = System.Drawing.Imaging.PixelFormat.Format32bppArgb;
            }
            else
            {
                pf = bmp.PixelFormat;
            }

            Bitmap tempImg = new Bitmap(w, h, pf);
            Graphics g = Graphics.FromImage(tempImg);
            g.Clear(bkColor);
            g.DrawImageUnscaled(bmp, 1, 1);
            g.Dispose();

            System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
            path.AddRectangle(new RectangleF(0f, 0f, w, h));
            System.Drawing.Drawing2D.Matrix mtrx = new System.Drawing.Drawing2D.Matrix();
            mtrx.Rotate(angle);
            RectangleF rct = path.GetBounds(mtrx);
            Bitmap newImg = new Bitmap(Convert.ToInt32(rct.Width), Convert.ToInt32(rct.Height), pf);
            g = Graphics.FromImage(newImg);
            g.Clear(bkColor);
            g.TranslateTransform(-rct.X, -rct.Y);
            g.RotateTransform(angle);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
            g.DrawImageUnscaled(tempImg, 0, 0);
            g.Dispose();
            tempImg.Dispose();
            return newImg;
        }