various updates and improvements for v0.3.0

[phip1611]

• merge of Use proper font metrics for calculating line height & update fonts #16
• prepare v0.3.0
• dependency updates
• code improvements
• example improvements

[phip1611]

Hm. @toothbrush7777777 I can't merge it like this, unfortunately. :/

If you run cargo run --example show_chars_in_window --features all, you will see:

The � character is pretty wide. How do we want to solve this nicely? Jetbrains IDEs solve
it is like this:

They just center it and cut it at the edges.

[toothbrush7777777]

@phip1611 Okay, I'll add some extra code to check if the character is too wide. The main issue seems to be that the font doesn't contain the replacement symbol (�); I'm not sure where that comes from. Do you want to scale the character down (e.g using image) or use only the centre part?

[phip1611]

The main issue seems to be that the font doesn't contain the replacement symbol

I don't understand why you say that. The replacement character is there? It is just cut of on the right side?

I'm not sure what's the right strategy to handle very wide characters, either. If it's not too complicated, you can try to make the symbol smaller. Otherwise, we should center it and cut it at the edges

[phip1611]

@toothbrush7777777 Any update?

[toothbrush7777777]

I don't think that the Noto Sans Mono font contains the replacement character glyph because I see an outlined box, not the glyph that you see.
I tried a couple of things with centring the glyph, which seems to work as far as I can tell. I'll try it on another Linux system which has the full desktop to double-check.

[toothbrush7777777]

Anyway, I've fixed it in #18 by centring the glyphs. Scaling the replacement character down looked terrible at sizes smaller than 24px.

[phip1611]

Thank you so much for working on this! I'll merge it as soon as I'm back from my long vacation in March

[phip1611]

I still have this on my list! Sorry for the long delay

[phip1611]

This is a screenshot of the current rendering in https://github.com/rust-osdev/bootloader (on the right). The left side shows my system's default mono space rendering using Source Code Pro as font:

So either something that we do or Noto Sans Mono itself causes the high line height. Nevertheless, I think that this is the best that we can get - for what it is.