通过GTK或GDK直接绘制到屏幕上

I am working on a demo application for a library me and two colleagues are writing to allow GNOME applications that run audio events though libCanberra to allow users to select visual events to replace them. This is an accessibility-minded effort to help both visually and aurally impaired users gain the benefits of audio alerts and such.I am working on a demo application for a librar