public FreeTypeGlyphSlot LockGlyph(uint glyphIndex, FT_LoadFlags loadFlags)
 {
     if (lockedGlyph != null)
     {
         throw new Exception("A glyph is already locked, use Dispose() or using { }");
     }
     FT.assert(FT.Load_Glyph(face, glyphIndex, loadFlags));
     updateFaceRec();
     lockedGlyph = new FreeTypeGlyphSlot(this, face_rec.glyph);
     return lockedGlyph;
 }
 public static extern FT_Error Load_Glyph(FT_Face face, FT_UInt glyph_index, FT_LoadFlags load_flags);