Пример #1
0
        /// <devdoc>
        ///     Creates a WindowsRegion from a System.Drawing.Region.
        /// </devdoc>
        public static WindowsRegion FromRegion(Region region, Graphics g)
        {
            if (region.IsInfinite(g))
            {
                // An infinite region would cover the entire device region which is the same as
                // not having a clipping region. Observe that this is not the same as having an
                // empty region, which when clipping to it has the effect of excluding the entire
                // device region.
                // To remove the clip region from a dc the SelectClipRgn() function needs to be
                // called with a null region ptr - that's why we use the empty constructor here.
                // GDI+ will return IntPtr.Zero for Region.GetHrgn(Graphics) when the region is
                // Infinite.
                return(new WindowsRegion());
            }

            return(WindowsRegion.FromHregion(region.GetHrgn(g), true));
        }