ComponentFactory.Krypton.Toolkit.RenderGlassHelpers.DrawBackGlassSimplePercent C# (CSharp) Method

        private static IDisposable DrawBackGlassSimplePercent(RenderContext context,
                                                              Rectangle rect,
                                                              Color backColor1,
                                                              Color backColor2,
                                                              VisualOrientation orientation,
                                                              GraphicsPath path,
                                                              float glassPercent,
                                                              IDisposable memento)
        {
            using (Clipping clip = new Clipping(context.Graphics, path))
            {
                MementoDouble cache;

                if ((memento == null) || !(memento is MementoDouble))
                {
                    if (memento != null)
                        memento.Dispose();

                    cache = new MementoDouble();
                    memento = cache;
                }
                else
                    cache = (MementoDouble)memento;

                // Get the drawing rectangle for the path
                RectangleF drawRect = new RectangleF(rect.X, rect.Y, rect.Width, rect.Height);

                // Draw the border as a lighter version of the inside
                cache.first = DrawBackGlassLinear(drawRect, drawRect,
                                                  backColor2,
                                                  backColor2,
                                                  _glassColorBottomDD,
                                                  _glassColorBottomDD,
                                                  orientation,
                                                  context.Graphics,
                                                  0,
                                                  cache.first);

                // Reduce by 1 pixel on all edges to get the inside
                RectangleF insetRect = drawRect;
                insetRect.Inflate(-1f, -1f);

                // Draw the inside area
                cache.second = DrawBackGlassLinear(insetRect, drawRect,
                                                   backColor1,
                                                   CommonHelper.MergeColors(backColor1, 0.5f, backColor2, 0.5f),
                                                   _glassColorTopDD,
                                                   _glassColorBottomDD,
                                                   orientation,
                                                   context.Graphics,
                                                   glassPercent,
                                                   cache.second);
            }

            return memento;
        }