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Revision as of 11:21, 16 June 2018 by Tagoh (talk | contribs) (Update test cases)

CJK Default Fonts To Noto


Changes the default fonts for CJK to Google Noto.


Current status

  • Targeted release: Fedora 29
  • Last updated: 2018-06-16
  • Tracker bug: <will be assigned by the Wrangler>

Detailed Description

This proposal is to change the default fonts for CJK to Google Noto. typefaces and the size consumptions will be changed as the follow:

Language Sans-serif Serif Monospace
ja VL Gothic -> Noto Sans CJK JP (No default serif) -> Noto Serif CJK JP VL Gothic -> Noto Sans Mono CJK JP
ko NanumGothic -> Noto Sans CJK KR (No default serif) -> Noto Serif CJK KR (No default monospace) -> Noto Sans Mono CJK KR
zh-CN Source Han Sans CN -> Noto Sans CJK SC Source Han Serif CN -> Noto Serif CJK SC Source Han Sans CN -> Noto Sans Mono CJK SC
zh-TW Source Han Sans TW -> Noto Sans CJK TC Source Han Serif TW -> Noto Serif CJK TC Source Han Sans TW -> Noto Sans Mono CJK TC

Note that all CJK fonts will be unified into one OpenType collection format file per weight-variants so there are no detailed estimation for f29. all of CJK languages' fonts will be covered by one package. the size consumptions are calculated from the font file size:

\ ja ko zh-CN zh-TW Total
f28 3.9M 13.8M 133.1M 77.4M 228.2M
f29 - - - - 288M

Benefit to Fedora

This change will provides better quality of rendering for all of CJK characters. we will have default serif and monospace fonts for Japanese and Korean and keep consistensies in look among those typefaces.


  • Proposal owners:
    • Update packages with the proper priority of fontconfig config files.
    • Update fonts group in comps
  • Other developers: N/A (not a System Wide Change)
  • Policies and guidelines: N/A
  • Trademark approval: N/A

Upgrade/compatibility impact

This change will be done by installing the updated packages. no need to update/modify any configuration files by the hand. the sort of this change may has the objective preference. they can revert this by uninstalling font packages like this:

# dnf uninstall google-noto-sans-cjk-ttc-fonts google-noto-serif-cjk-ttc-fonts

How To Test

  • Check if the default font is changed to Noto:
    • ja
      • LANG=ja_JP.UTF-8 fc-match sans-serif:lang=ja
      • LANG=ja_JP.UTF-8 fc-match serif:lang=ja
      • LANG=ja_JP.UTF-8 fc-match monospace:lang=ja
    • ko
      • LANG=ko_KR.UTF-8 fc-match sans-serif:lang=ko
      • LANG=ko_KR.UTF-8 fc-match serif:lang=ko
      • LANG=ko_KR.UTF-8 fc-match monospace:lang=ko
    • zh-cn
      • LANG=zh_CN.UTF-8 fc-match sans-serif:lang=zh-cn
      • LANG=zh_CN.UTF-8 fc-match serif:lang=zh-cn
      • LANG=zh_CN.UTF-8 fc-match monospace:lang=zh-cn
    • zh-tw
      • LANG=zh_TW.UTF-8 fc-match sans-serif:lang=zh-tw
      • LANG=zh_TW.UTF-8 fc-match serif:lang=zh-tw
      • LANG=zh_TW.UTF-8 fc-match monospace:lang=zh-tw
  • Check the following items on applications (GTK+: gedit, gnome-terminal etc, Qt: kate, konsole etc, X/Xft: xterm etc, Others: LibreOffice, firefox etc)
    • Check applications preference if the above fonts are visible
    • Check applications if the above fonts are rendered properly
    • Check applications if those fonts are chosen as the default font for certain language when the generic family names like sans-serif, serif, and monospace is selected.
      • See the above table for mapping between language and families

User Experience

Users will see better quality of rendering for CJK characters on applications and on desktops.



Contingency Plan

  • Contingency mechanism: (What to do? Who will do it?) revert all of changes in packages and comps
  • Contingency deadline: Beta freeze
  • Blocks release? No


N/A (not a System Wide Change)

Release Notes