System.Drawing.Drawing2D.GraphicsPath.AddBeziers C# (CSharp) Method

        public void AddBeziers(params Point[] points)
        {
            if (points == null)
                throw new ArgumentNullException ("points");

            int count = points.Length;

            /* first bezier requires 4 points, other 3 more points */
            if ((count < 4) || ((count % 3) != 1))
                throw new ArgumentException ("points");

            AddBeziers (points.ToFloat ());
        }

        public static RectangleF AddWindowsFontOutline(this GraphicsPath graphicsPath, FontOutline outline, float size, PointF origin, bool enableHorizontalCenteringMode)
        {
            if (outline is null || outline.Polygons.Length == 0)
            {
                return(new RectangleF(origin, SizeF.Empty));
            }

            float horizontalOffset = enableHorizontalCenteringMode ? outline.GlyphMetrics.CalcHorizontalCenteringOffset(outline.EmSquare) : 0;

            var scaleFactor = size / outline.EmSquare;

            foreach (var polygon in outline.Polygons)
            {
                graphicsPath.StartFigure();

                var startPoint = polygon.StartPoint;

                foreach (var curve in polygon.Curves)
                {
                    var points = curve.ToGraphicsPathPoint(ref startPoint, horizontalOffset, scaleFactor, origin);

                    if (curve.PrimitiveType == TtPrimitiveTypes.Line)
                    {
                        graphicsPath.AddLines(points);
                    }
                    else if (curve.PrimitiveType == TtPrimitiveTypes.CubicBezierSpline)
                    {
                        graphicsPath.AddBeziers(points);
                    }
                    else if (curve.PrimitiveType == TtPrimitiveTypes.QuadraticBezierSpline)
                    {
                        var curveCount = (points.Length - 1) / 2;

                        var cubicBezierPoints = new PointF[points.Length + curveCount];

                        for (int i = 0; i < curveCount; i++)
                        {
                            var c0 = points[i * 3 + 0];
                            var c1 = points[i * 3 + 1];
                            var c2 = points[i * 3 + 2];

                            cubicBezierPoints[i * 4 + 0] = c0;
                            cubicBezierPoints[i * 4 + 1] = Add(Mul(c0, 1 / 3f), Mul(c1, 2 / 3f));
                            cubicBezierPoints[i * 4 + 2] = Add(Mul(c2, 1 / 3f), Mul(c1, 2 / 3f));
                            cubicBezierPoints[i * 4 + 3] = c2;
                        }

                        graphicsPath.AddBeziers(cubicBezierPoints);
                    }
                }

                graphicsPath.CloseFigure();
            }


            return(new RectangleF(origin, new SizeF(outline.EmSquare, outline.EmSquare)));
        }