background for analog watch face in lvgl

[minacode]

Alternative to #1819.

This commit removes the background image for the WatchFaceAnalog and replaces it with lvgl widgets. It aims to keep the original look.

The refresh is almost instant now.

I am not sure at how much places the background image has to be removed. If someone knows more about that, please have a look at it.

Colors are up to debate 😁

• runs currently on my watch without problems

[github-actions]

Build size and comparison to main:

Section	Size	Difference
text	395204B	-14096B
data	996B	0B
bss	63372B	0B

[FintasticMan]

Looks good! You should just be able to remove the bg_clock.c file from CMakeLists.txt, then delete the file itself.

[FintasticMan]

I quite like this with the current colours. It might be nice to keep the 'PineTime' text, but I'm not sure we have the right font to make it look good. I would like some other people's opinions on how it looks before I approve this.

[minacode]

I tried it with 'PineTime' first and can confirm that it does not look good with the current font 😄

[NeroBurner]

It would be interesting what the ram usage at runtime difference between this new and the old one with the background image is

[minacode]

Which number do you need?

Memory heap
Free 19576
Min free 9896

[FintasticMan]

It would be better to use a label to display the current free memory on the watch face itself, because the face is unloaded when you go to the about page to look at the memory. (assuming you don't have a debugger connected)

[minacode]

Makes sense. How can I get the current free memory?

[FintasticMan]

xPortGetFreeHeapSize()

[88572]

I tried it with 'PineTime' first and can confirm that it does not look good with the current font 😄

Personally, I would like Fredoka 600 from Google Fonts.

[minacode]

Tbh, I like the watch face more without some brand label. Isn't it also possible (or at least a goal) to run InfiniTime on non-PineTime watches?

[FintasticMan]

You're right, it is possible to run InfiniTime on other watches, currently only variations of the Colmi P8.

[Boteium]

Great Job !
It's a really clever use of lv_lmeter.
I would never think of it and would implement this in several lvgl objects.

[minacode]

Here are the measurements:
New watch face: 16904 once, then 16744 constantly
Old watch face: 17536 once, then 17472 constantly

[JF002]

Great job! This effectively frees ~14KB in flash, which is not insignificant at all!

Here is a picture showing the original analog watchface and this one:

They look quite similar, IMO, except for the font size, obviously.

This PR also improve the drawing speed of the watchface :

infinitime-analog-comparison-l.mp4

RAM usage at runtime looks good. It allocates ~2.8KB in RAM (from the freeRTOS heap). The casio watchface (the one with the heaviest RAM usage) allocates ~12KB, so I guess we're good!

[JF002]

This new implementation of the watch face looks good! I think the small visual differences are very much compensated by the amount of freed flash memory!

[FintasticMan]

I agree.