There are approximately a billion ways of achieving what you vaguely describe, so, more details would be nice.
In no particular order:
* If it's standard document types you're working with, KOReader has an auto-turn plugin.
* I'm pretty sure people have written multiple things related to sending synthetic button/touch events in the past, so, that's an option too in stock-land.
* If you do intend to work with stock screensaver, the ScreenSaver's hack cover mode is essentially generating a screensaver at runtime. The trick being, if there's only one file in the pool, it'll get picked up, so just update that one file over and over.
* Otherwise, DIY w/ FBInk in C/C++/Python/Lua/Go/(shell), in which case, sky's the limit.
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