Built-in fonts

[nagyrobi]

Built-in fonts

[nagyrobi]

OK, after reading a bit, compressed and subpx can be ditched.

TLDR;
https://docs.lvgl.io/8/overview/font.html#subpixel-rendering this looks as something pretty hardware-specific:

Subpixel rendering works only if the color channels of the pixels have a horizontal layout. That is the R, G, B channels are next each other and not above each other.

You can't rotate the screen because of this. I guess this is targeted in LVGL to speciality hardware which is developed with a certain screen in mind.

We could ditch montserrat_12_subpx, also because this subpixel font is only available in12px size. It also requires special parameters at compile time. Imho if anyone wants to play with subpixel rendering in ESPHome, should try on a dedicated branch with custom fonts rendered.

https://docs.lvgl.io/8/overview/font.html#compress-fonts compressed fonts have a compromise:

The compression is more effective with larger fonts and higher bpp. However, it's about 30% slower to render the compressed fonts. Therefore it's recommended to compress only the largest fonts of user interface, because

• they need the most memory
• they can be compressed better
• and probably they are used less frequently then the medium sized fonts, so the performance cost is smaller.

Don't think this is appropriate for ESP's, or the platforms ESPHome targets. I thinbk montserrat_28_compressed is the only one included (just like montserrat_12_subpx) just to demonstrate that these featrues are doable in LVGL, but imho ESPHome doesn't need these.

[clydebarrow]

Done