Avoid Waking Up
If you take a normal application and convert it to a screen saver, you
may find it stops suddenly. The trick is to remove the code that you
added to prevent the screen saver from coming on -- that's now causing
your application that is running as a screen saver to exit!
Use a Direct Screen Buffer
It is possible to get direct access to the screen memory of either the
graphics plane or the video plane. This allows you to draw arbitrary
shapes or colors onto the screen, a common task with screen savers.
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