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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
There are some very specific hacks for Bangle.js graphics: https://github.com/espruino/Espruino/blob/master/libs/graphics/lcd_st7789_8bit.h#L52
But I'd rather not have IFDEFs piled up on top of each other. I guess what we need is to have a more generic way of adding optimisations.
If you want to do optimisation on the Graphics library it'd be great - but ideally try and optimise it such that it benefits everyone, not just one specific use case that you have to compile custom firmware for.