SubPixel Font Rendering

How-to
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1

Description

What MCU/Processor/Board and compiler are you using?

ESP32S3 on a WT32-SC01-PLUS

What LVGL version are you using?

Version 9.0.0

What do you want to achieve?

I’m trying to use custom fonts on my display. Most of them are working fine (using TinyTTF).
Now I’m going a step further and want to use SubPixel Rendered Fonts - as it worked in lvl 8.3.x for me.
But in Version 9 the setting in lvl.con ist gone — and if I use (Online-) converted fonts with
Horizontal subpixel rendering the text ist rendered very - uhm - strange.

What have you tried so far?

Added old entry to lv_conf.h didn’t work.

2

@kisvegabor
This question appears unanswered, but I also experienced the same issue. I am slowly converting to 9.2.0 from 8.3.6, and have several custom fonts. I used the latest online font generator to ‘regenerate’ the same font files at 4 bits per pixel and with horizontal sub-pixel rendering enabled (no compression). When I run the app, the fonts are rendering oddly, but if I regen the font files without sub-pixel rendering, they render correctly.

Is there some guidance around the differences between v8 and v9 that we need to be aware of for sub-pixel rendering to work?