slint font rendering is very poor, how to solve it

[xiacc-cn]

See the picture below

[ogoffart]

Do you know what renderer/backend you are using? There are some differences between skia and femtovg.
I think skia is used in the live preview, while femtovg is the default in a rust application unless you enable skia with a feature flag.

[nproux]

Not OP, but I ran into the same issue and changing to the skia renderer seems to resolve it for me. The font rasterization in the default renderer and default text family (for Windows 11 environment at least) seems to be impressively bad right now. For reproduction I was using English characters at font sizes 20px and 24px, both bold and regular, with a Rust backend. Build and run in release mode and you should notice it right away.

It might be a bug in the renderer rather than Slint itself, but I suggest that what Slint picks as the default renderer should probably be biased towards something that visually looks decent. New users aren't likely to dig into details of how to make things better if their initial testing has pretty poor results. That said your team might have other concerns I'm not aware of that make the current default choice the better tradeoff, so feel free to ignore me on that.