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[Bug 2017573] Re: Font hinting broken on Plasma 23.04


Thanks for being picky.

I did a more thorough test on Ubuntu (with GNOME). I focused on the
Ubuntu font, disabled antialiasing, tested with hining "none" respective
"full", and studied the rendering of a particular string in GNOME's
Settings menu.

Conclusion: fonts-ubuntu 0.863 — unlike fonts-ubuntu 0.83 — ignores the
font hinting value. That's true both in the 23.04 and the 22.04
environment (with different versions of fontconfig). So, as regards the
Ubuntu font, the problem seems to be with the font itself.

And yes, the problem is apparently not Kubuntu specific.

Now, the Ubuntu font underwent a big redesign in the 23.04 development
cycle. If you look at the attached picture, you see that the new fonts-
ubuntu (which ignores the fonts hinting) looks rather similar to the old
fonts-ubuntu with full hinting. I can't help wondering if hinting
possibly is built-in in the new fonts-ubuntu, and that it has
intentionally been detached from the configured hinting value. If not,
we have identified a fonts-ubuntu bug. And that would be a regression.

As regards other fonts but Ubuntu, where you have found that font
hinting is ignored when rendering: Have you confirmed that font hinting
was respected in e.g. Kubuntu 22.04 for those fonts? (Asking because I
have not yet looked closer at any other fonts myself.)

** Also affects: fonts-ubuntu (Ubuntu)
   Importance: Undecided
       Status: New

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  Font hinting broken on Plasma 23.04

Status in fonts-ubuntu package in Ubuntu:
Status in plasma-desktop package in Ubuntu:

Bug description:
  Just upgraded my laptops to Kubuntu 23.04 Lunar Lobster and hinting
  for all non-commercial fonts seems broken. I used to have decent if
  not perfect hinting on Ubuntu and Ubuntu Mono font, but now the only
  fonts that still hint correctly are Microsoft's Verdana and Tahoma
  etc. Not sure whether the devide is exactly along this line, but it
  stands out.

  Tried regenerating font cache (fc-cache -rv) but that didn't help.

  Operating System: Kubuntu 23.04
  KDE Plasma Version: 5.27.4
  KDE Frameworks Version: 5.104.0
  Qt Version: 5.15.8
  Kernel Version: 6.3.0 (64-bit)
  Graphics Platform: Wayland
  Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz
  Memory: 31.1 GiB of RAM
  Graphics Processor: Mesa Intel® UHD Graphics
  Manufacturer: Notebook
  Product Name: N141CU
  System Version: Not Applicable

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