Re: F38 proposal: Noto CJK Variable Fonts (Self-Contained Change proposal)

Hi,

Seems that some changes mentioned below just hit
fedora:fedora/38/x86_64/testing/silverblue today in version
38.20230314.0. And ostree diff is below (changes between 38.20230313.0
and 38.20230314.0, filtered to show only fontconfig files for CJK):

D    /usr/etc/fonts/conf.d/65-0-google-noto-sans-cjk-ttc.conf
D    /usr/etc/fonts/conf.d/65-google-noto-cjk-fonts.conf
D    /usr/share/fontconfig/conf.avail/65-0-google-noto-sans-cjk-
ttc.conf
D    /usr/share/fontconfig/conf.avail/65-google-noto-cjk-fonts.conf
A    /usr/etc/fonts/conf.d/65-0-google-noto-sans-cjk-vf-fonts.conf
A    /usr/etc/fonts/conf.d/65-google-noto-sans-cjk-mono-vf-fonts.conf
A    /usr/etc/fonts/conf.d/65-google-noto-sans-cjk-vf-fonts.conf
A    /usr/share/fontconfig/conf.avail/65-0-google-noto-sans-cjk-vf-
fonts.conf
A    /usr/share/fontconfig/conf.avail/65-google-noto-sans-cjk-mono-vf-
fonts.conf
A    /usr/share/fontconfig/conf.avail/65-google-noto-sans-cjk-vf-
fonts.conf

But I am noticing some font being very thin, including English fonts in
Evince when not using embed fonts and all non-UI text in Telegram (both
Evince and Telegram is installed from flatpak). 

I don't know if this should be considered as a bug from this change or
just several applications not being compatible with VF fonts and should
be reported to their upstream separately.

Cheers,
Qiyu Yan

---
This is an example of a random PDF file not being rendered correctly:
https://texdoc.org/serve/latexmk/0

Firefox can correctly render fonts with different weight while Evince
will produce equal-weight result.

在 2023-01-09星期一的 13:28 -0500，Ben Cotton写道：
>  https://fedoraproject.org/wiki/Changes/Noto_CJK_Variable_Fonts
>  
>  This document represents a proposed Change. As part of the Changes
>  process, proposals are publicly announced in order to receive
>  community feedback. This proposal will only be implemented if
>  approved
>  by the Fedora Engineering Steering Committee.
>  
>  
>  == Summary ==
>  Switch the default Noto CJK fonts for Chinese, Japanese and Korean
>  from static to variable fonts.
>  
>  == Owner ==
>  * Name: [[User:pwu| Peng Wu]]
>  * Email: pwu(a)redhat.com
>  
>  
>  == Detailed Description ==
>  In order to reduce the font size in Noto CJK fonts, we plan to switch
>  to use the variable fonts by default.
>  
>  # Split the google-noto-cjk-fonts package into
>  google-noto-sans-cjk-fonts and google-noto-serif-cjk-fonts, and
>  provide the variable fonts in google-noto-sans-cjk-vf-fonts and
>  google-noto-serif-cjk-vf-fonts.
>  # Drop several sub packages which are not installed by default from
>  the google-noto-cjk-fonts package.
>  ## Like google-noto-sans-cjk-*-fonts, google-noto-sans-*-fonts,
>  google-noto-sans-mono-cjk-*-fonts, google-noto-serif-cjk-*-fonts and
>  google-noto-serif-*-fonts
>  # Install the Noto CJK Variable Fonts by default.
>  
>  Fedora Copr for testing:
>  https://copr.fedorainfracloud.org/coprs/pwu/noto-cjk/
>  
>  == Feedback ==
>  
>  
>  == Benefit to Fedora ==
>  The variable fonts will reduce the disk space usage and live image
>  size compared to the static fonts.
>  
>  {| class="wikitable"
>  > + RPM Size
>  > -
>  !  Size (bytes) !! Noto Sans CJK !! Noto Serif CJK
>  > -
>  > Static Fonts || 130674365 || 181621033
>  > -
>  > Variable Fonts || 64613100 || 56924710
>  > }
>  
>  == Scope ==
>  * Proposal owners:
>  ** Package four font packages for Noto CJK fonts
>  ** Retire google-noto-cjk-fonts in Fedora rawhide
>  ** Switch to install variable fonts by default in fedora-comps and
>  langpacks
>  ** Submit pull request to lorax templates to use
>  google-noto-sans-cjk-fonts in the boot.iso
>  
>  * Other developers:
>  
>  * Release engineering:
>  * Policies and guidelines: N/A (not needed for this Change)
>  * Trademark approval: N/A (not needed for this Change)
>  * Alignment with Objectives:
>  
>  
>  == Upgrade/compatibility impact ==
>  
>  When upgrade, the variable fonts will be installed by default.
>  
>  == How To Test ==
>  
>  * Please upgrade to Fedora 38 or rawhide to get the latest fonts
>  * Install the variable fonts: google-noto-sans-cjk-vf-fonts and
>  google-noto-serif-cjk-vf-fonts
>  ** Check the google-noto-sans-cjk-ttc-fonts and
>  google-noto-serif-cjk-ttc-fonts packages are replaced
>  * Then use CJK locales to check if the new fonts have any problem
>  
>  == User Experience ==
>  
>  This new variable fonts will reduce the disk space usage and live
>  image size.
>  
>  == Dependencies ==
>  
>  
>  == Contingency Plan ==
>  
>  * Contingency mechanism: Use the static fonts by default -
>  google-noto-sans-cjk-fonts and google-noto-serif-cjk-fonts
>  * Contingency deadline: N/A
>  * Blocks release? N/A
>  
>  
>  == Documentation ==
>  N/A (not a System Wide Change)
>  
>  == Release Notes ==
>  
>  This new variable fonts will reduce the disk space usage and live
>  image size.
>  
>  
>  -- 
>  Ben Cotton
>  He / Him / His
>  Fedora Program Manager
>  Red Hat
>  TZ=America/Indiana/Indianapolis
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