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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.
@FransM
Hi,
I was looking for a way to render part of an image file.
Idea is to draw a background image as watchface and restore only damaged sections when the clockhand moves.
I've seen the mechanism that is used in imgclock but that one requires an intermediate file which works if the area is always the same, but is not very convenient for clockhands.
Ideally I would like to have some rasterop/bitblt like functionality that could render from file or memory to screen., but I am not sure how easy it is to realise that (in an efficient way).
Then again if the flash is memory mapped it should be feasible.
Anyway: any suggestions on how to achieve selective redraws?
Frans.
PS: I understood from the ST7789VW datasheet that it actuall has an on-chip display data RAM of 240 x 320 x 18 bits. Not sure if our bangle uses the VW version, but if so would it make sense to make the off-screen data ram available? (I didn't go through all of the data sheet but maybe having data on the LCD controller chip could help to implement things in a more efficient way).