[Fontconfig-bugs] [Bug 81453] New: Support more font weights?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81453

          Priority: medium
            Bug ID: 81453
          Assignee: fontconfig-bugs at lists.freedesktop.org
           Summary: Support more font weights?
        QA Contact: freedesktop at behdad.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: kanru at kanru.info
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: library
           Product: fontconfig

Recently Adobe & Google released a open-source pan-CJK font, Source Han Sans
from Adobe or Noto Sans CJK from Google.

This font family features 7 font weights: ExtraLight, Light, Normal, Regular,
Meidum, Bold, Heavy and their os2 weight are: 100, 300, 350, 400, 500, 700, 900
respectively.

However, in fontconfig, os2 weight class 350 and 400 both maps to weight 80 and
I think this makes fontconfig or pango confuse about how to choose the default
font.

In particular in the GktFontChooser user can't choose one of these fonts. To
fix this we probably also have to fix Pango.

This issue is also reported to the source-han-sans project:
https://github.com/adobe-fonts/source-han-sans/issues/5

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