[Deck] Tofu Issue with CJK Languages in Steam

[szescxz]

Only affects Steam, in both Game Mode and Desktop Mode.

More info: ValveSoftware/steam-for-linux#9418

Workaround (for some reason it does not work for Korean and also the update screen before entering Game Mode):

$ rpm-ostree override remove google-noto-sans-cjk-vf-fonts
$ rpm-ostree install google-noto-sans-cjk-fonts

[KyleGospo]

Thank you!
c87d9fe

[szescxz]

Located the fix for the tofus on Steam update screen ("Steam Bootstrapper") as well - I believe Valve has hardcoded the path to the font files. Game Mode is CEF-based so doesn't have such issue (and actually uses the correct region-specific glpyh).

$ strings $HOME/.local/share/Steam/ubuntu12_32/steam

Search for CJK in the output for a quick proof. Read on for digged details after reverse engineering.

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In addition to $HOME/.steam/root//tenfoot/resource/fonts/tenfoot.uifont (sic) and /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf (see also negativo17/steamos-base-files#1), Steam is expecting one of these font files:

NotoSansCJK-Medium.ttc
NotoSansCJK-Light.ttc
NotoSansCJK-Regular.ttc # <- looking for this one first

under either of the following path:

/usr/share/fonts/noto-cjk # <- path used in Arch Linux (including SteamOS 3.x)
/usr/share/fonts/opentype/noto # <- path used in Debian-based distros

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Working PoC:

$ sudo ostree admin unlock
$ sudo ln -s /usr/share/fonts/google-noto-sans-cjk-fonts /usr/share/fonts/noto-cjk

[KyleGospo]

7dd9580

[szescxz]

@KyleGospo
Things are broken again in F39. I believe patches applied to F38 in ublue-os/main#334 needs to be applied to F39 as well.

• Right now Droid Sans Fallback (provided by google-droid-sans-fonts) gets picked by the Game Mode UI; fine with Chinese and Japanese but still broken with Korean
• Symlink I proposed is broken on F39 as google-noto-sans-cjk-fonts is not installed, causing the tofus on the Steam Bootstrapper screen again

Fixed by rpm-ostree install google-noto-sans-cjk-fonts; no need to remove any packages (google-noto-sans-cjk-vf-fonts is already removed, and even not installable on my device).