Just so you can test - here's @allObjects' code in the emulator (using the 120x120 gfx mode to double up pixels): https://www.espruino.com/ide/emulator.html?gist=d1b9f19415fe7d58dff5fe8bedf7fbd4&upload
@Raik thanks - that code looks great. It does say public domain, and honestly it's pretty simple and I'm sure I've seen similar pseudocode in a bunch of places. I'll reimplement it for Espruino with the same basic logic (ideally the final rendering stage would use Espruino's fillRect anyway) just to avoid any potential issues.
... I also wonder how hard it'd be to add antialiasing to that. Probably not that painful at all :)
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