    *   Due to *PATENTS* covering subpixel rendering, this function doesn't    *   do anything except returning `FT_Err_Unimplemented_Feature' if the    *   configuration macro FT_CONFIG_OPTION_SUBPIXEL_RENDERING is not    *   defined in your build of the library, which should correspond to all    *   default builds of FreeType.    *    * @since:    *   0.0.0    */   FT_EXPORT( FT_Error )   FT_Library_SetLcdFilter