/// ------------------------------------------------------------------------------------
        /// <summary>
        /// Setups the font features.
        /// </summary>
        /// ------------------------------------------------------------------------------------
        private void SetupFontFeatures()
        {
            if (m_fontName == null || m_fontName == "")
            {
                Enabled = false;
                return;
            }
            IRenderEngine renderer;

            if (FontHasGraphiteTables(m_fontName, false, false))
            {
                renderer = FwGrEngineClass.Create();
            }
            else
            {
                renderer = UniscribeEngineClass.Create();
            }
            renderer.WritingSystemFactory = m_wsf;
            HoldDummyGraphics hdg = new HoldDummyGraphics(m_fontName, false, false, CreateGraphics());

            renderer.InitRenderer(hdg.m_vwGraphics, m_fontFeatures);
            m_featureEngine = renderer as IRenderingFeatures;
            if (m_featureEngine == null)
            {
                Enabled = false;
                hdg.Close();
                return;
            }
            int cfid;

            m_featureEngine.GetFeatureIDs(0, null, out cfid);
            if (cfid == 0)
            {
                Enabled = false;
                hdg.Close();
                return;
            }
            if (cfid == 1)
            {
                // What if it's the dummy built-in graphite feature that we ignore?
                // Get the list of features (only 1).
                using (ArrayPtr idsM = MarshalEx.ArrayToNative(cfid, typeof(int)))
                {
                    m_featureEngine.GetFeatureIDs(cfid, idsM, out cfid);
                    int [] ids = (int[])MarshalEx.NativeToArray(idsM, cfid, typeof(int));
                    if (ids[0] == kGrLangFeature)
                    {
                        Enabled = false;
                        hdg.Close();
                        return;
                    }
                }
            }
            Enabled = true;
            hdg.Close();
        }
        /// ------------------------------------------------------------------------------------
        /// <summary>
        /// Setups the font features.
        /// </summary>
        /// ------------------------------------------------------------------------------------
        public void SetupFontFeatures()
        {
            CheckDisposed();

#if __MonoCS__
            // TODO-Linux: Neither Graphite or UniscribeEngine Avaliable
            m_featureEngine = null;
            return;
#else
            if (m_fontName == null || m_fontName == "")
            {
                Enabled          = false;
                m_isGraphiteFont = false;
                return;
            }
            IRenderEngine renderer;
            if (FontHasGraphiteTables(m_fontName, false, false))
            {
                renderer         = FwGrEngineClass.Create();
                m_isGraphiteFont = true;
            }
            else
            {
                renderer         = UniscribeEngineClass.Create();
                m_isGraphiteFont = false;
            }
            renderer.WritingSystemFactory = m_wsf;
            using (HoldDummyGraphics hdg = new HoldDummyGraphics(m_fontName, false, false, this))
            {
                renderer.InitRenderer(hdg.m_vwGraphics, m_fontFeatures);
                m_featureEngine = renderer as IRenderingFeatures;
                if (m_featureEngine == null)
                {
                    Enabled = false;
                    return;
                }
                int cfid;
                m_featureEngine.GetFeatureIDs(0, null, out cfid);
                if (cfid == 0)
                {
                    Enabled = false;
                    return;
                }
                if (cfid == 1)
                {
                    // What if it's the dummy built-in graphite feature that we ignore?
                    // Get the list of features (only 1).
                    using (ArrayPtr idsM = MarshalEx.ArrayToNative <int>(cfid))
                    {
                        m_featureEngine.GetFeatureIDs(cfid, idsM, out cfid);
                        int [] ids = MarshalEx.NativeToArray <int>(idsM, cfid);
                        if (ids[0] == kGrLangFeature)
                        {
                            Enabled = false;
                            return;
                        }
                    }
                }
                Enabled = true;
            }
#endif
        }