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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
The issue is that the 9341 driver is one-way - it never actually reads anything back from the 9341 at all (in fact on a few devices I've seen I don't think the MISO pin is connected at all) - so it has absolutely no way of getting the current pixel colour.
It'd be much easier to use the current background colour. After all, presumably you as the programmer know what colour the background will be where you're writing text, and can set it accordingly.