Rockbox Ports are now being developed for various digital audio players!
If you used true type font format, what you see will be different from what you get. Use the Rockbox format or bdf.
Why do you need to convert? Rockbox contains code for handling the fonts already. If you want it to be what you see is what you get you should be using identical algorithms to Rockbox. You could use the simulator as a starting point.
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