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Created August 7, 2017 21:25
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Noto CJK font fix
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<!--
Problem: After installing the Noto fonts (on my Debian `stretch`
system, with `apt install fonts-noto`), Japanese text in my
browser ends up displayed in the "Medium" style of the font
rather than the "Regular" style. The "Medium" style is too
heavy for normal text.
Solution: Configure fontconfig to look specifically for Regular.
This can't be done with just the `style` property in the
pattern, because Medium has `style=Medium,Regular` and
Regular just has `style=Regular`, and there doesn't seem to be
a pattern that will prefer the latter over the former.
So we use `weight`, but there's a bug in the font metadata
where DemiLight has the same weight as Regular, which causes
us to get DemiLight. Fix that bug too.
To use:
1. Put this file in place at `/etc/fonts/conf.d/71-noto-fix.conf`.
2. Run `sudo dpkg-reconfigure fontconfig` to rebuild the
fontconfig cache. (Otherwise the `target=pattern` rules will
take effect, but not the `target=scan` rules.)
3. (Optional) Run `fc-match "Noto Sans CJK JP"` and observe that
you now get the Regular variant.
-->
<fontconfig>
<match target="pattern">
<test name="family" compare="contains">
<string>Noto Sans CJK</string>
</test>
<edit name="weight">
<const>regular</const>
</edit>
</match>
<match target="pattern">
<test name="family" compare="contains">
<string>Noto Sans Mono CJK</string>
</test>
<edit name="weight">
<const>regular</const>
</edit>
</match>
<!-- Regular has weight 80. For a corrected DemiLight weight, we
pick 55, somewhat arbitrarily but because that's the
"demilight" value mentioned in the fontconfig manual:
https://www.freedesktop.org/software/fontconfig/fontconfig-user.html
-->
<match target="scan">
<test name="family" compare="contains">
<string>Noto Sans CJK</string>
</test>
<test name="style">
<string>DemiLight</string>
</test>
<edit name="weight">
<int>55</int>
</edit>
</match>
<!-- Similarly Thin is at 50, same as Light. -->
<match target="scan">
<test name="family" compare="contains">
<string>Noto Sans CJK</string>
</test>
<test name="style">
<string>Thin</string>
</test>
<edit name="weight">
<int>40</int>
</edit>
</match>
</fontconfig>
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