Bug 1531986

Summary: UMing considers itself half a sans-serif and lacks provisions for zh_CN
Product: [Fedora] Fedora Reporter: Mingye Wang <arthur200126>
Component: cjkuni-uming-fontsAssignee: Peng Wu <pwu>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: unspecified    
Version: 27CC: i18n-bugs, kent.neo, petersen, pswo10680, pwu
Target Milestone: ---Keywords: i18n
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Last Closed: 2018-11-30 20:49:58 UTC Type: Bug
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Description Mingye Wang 2018-01-07 02:56:50 UTC
Description of problem:
UMing as packaged by Fedora comes with a fontconfig file 65-ttf-arphic-uming.conf that prepends it to a number of families in a number of locales. This file has problems.

Version-Release number of selected component (if applicable):

How reproducible:
Always (text-editor level).

Steps to Reproduce:
1. gedit /usr/share/fontconfig/conf.avail/65-ttf-arphic-uming.conf

Actual results:
This file wants to prepend UMing, a serif, to the good list of sans-serifs. This file also misses AR PL UMing CN for zh_CN.

Expected results:
UMing should not be prepended as a sans-serif. An entry similar to HK and TW for UMing CN should be added.

Additional info:
Current default fonts are way ahead of them in precedence, so this problem on its own shouldn't cause anything bad unless someone uninstalled all of them...

Comment 1 Peng Wu 2018-01-08 05:06:07 UTC
I think maybe good to not change default Chinese fonts by installing fonts packages.

If you want to change default Chinese fonts, please try fonts-tweak-tool.

UMing/UKai fonts are for Traditional Chinese, not for Simplified Chinese.

Compared to Source Han Sans CN, both UMing and UKai are Serif fonts, I think.

Comment 2 Mingye Wang 2018-01-08 06:03:41 UTC
> I think maybe good to not change default Chinese fonts by installing fonts packages.

UMing is attempting to do so with the "prepend" directives its fontconfig file. It fails because Fedora has other defaults. Parts of its attempts -- those adding it to sans-serif -- are nevertheless wrong. And "Sans" is short for sans-serif FYI.

> UMing/UKai fonts are for Traditional Chinese, not for Simplified Chinese.

There are CN variants. You might be thinking it is for Trad. because it is not complying well with Chinese standards, but guess what it's not very TW/HK-compliant either. And people still use it in TW and HK!

If you are thinking it's not for Simp. because it's called a "Ming", then nobody should be using Source Han Serif for Trad and Japanese because it's called a "Song".

> Compared to Source Han Sans CN, both UMing and UKai are Serif fonts, I think.

Fontconfig uses generic families beyond sans-serif, serif, and monospace. You can read those files numbered 60 to 69 in conf.avail for a sense of it. There's "cursive" for handwritten stuff[^1] like Kai and Comic Sans. There's also "fantasy" for crazy-looking things like "impact".

  [^1]: my bad, I've been calling it "script". I will re-test 1531985.

Comment 3 Cheng-Chia Tseng 2018-01-08 07:23:14 UTC
Since the rules in the fontconfig file of AR PL UMing package try to prepend itself in the generic Sans-serif and Monospace font candidate list besides Serif one, installing the package will definitely affect the default Chinese font behavior.

There three main thoughts on this issue:
1. UMing is a 明體/宋體 typeface which is grossly referred to the generic Serif font family. It must not claim itself as a candidate font to prepend to the generic "Sans-serif" or "Monospace" font family or it creates unexpected result for everyone who install the package.

The rules to claim AR PL UMing as a generic sans-serif or monospace font family should be removed

2. AR PL UMing provides AR PL UMing CN variant for China, although the glyph in TW, HK and CN are all the same. The project planned to support different variants of the glyph in different regions but failed to do so after the initial commit. The project latter stopped and is not maintained anymore.
However, we can still map AR PL UMing CN to map zh-cn language tag for the users to let applications using fontconfig technology can see AR PL UMing as a generic Serif font family.

3. As we are using Source Han Serif font as the default Chinese font candidate in the generic Serif font family, we should make sure that installing AR PL UMing package won't change the default Chinese font behavior.

In my f27 installation with traditional Chinese environment, I installed AR PL UMing package as well, and the output of fc-match -s Serif still see Source Han Serif TW font as the first Chinese candidate, so the Chinese font candidate list seems to work as expected.

$ fc-match -s Serif
SourceHanSerifTW-Regular.otf: "思源宋體 TW" "Regular"
DejaVuSerif.ttf: "DejaVu Serif" "Book"
DejaVuSerif-Bold.ttf: "DejaVu Serif" "Bold"
DejaVuSerif-Italic.ttf: "DejaVu Serif" "Italic"
DejaVuSerif-BoldItalic.ttf: "DejaVu Serif" "Bold Italic"
NimbusRoman-Regular.t1: "Nimbus Roman" "Regular"
StandardSymbolsPS.t1: "Standard Symbols PS" "Regular"
STIX-Regular.otf: "STIX" "Regular"
STIX-Bold.otf: "STIX" "Bold"
STIX-Italic.otf: "STIX" "Italic"
STIX-BoldItalic.otf: "STIX" "Bold Italic"
Caladea-Regular.ttf: "Caladea" "Regular"
SourceHanSerifCN-Regular.otf: "思源宋体 CN" "Regular"
Symbola.ttf: "Symbola" "Regular"
mingliu.ttc: "新細明體" "Regular"
Lohit-Bengali.ttf: "Lohit Bengali" "Regular"
Lohit-Gujarati.ttf: "Lohit Gujarati" "Regular"
Lohit-Tamil.ttf: "Lohit Tamil" "Regular"
Meera.ttf: "Meera" "Regular"
Lohit-Kannada.ttf: "Lohit Kannada" "Regular"
Lohit-Telugu.ttf: "Lohit Telugu" "Regular"
uming.ttc: "AR PL UMing TW" "Light"

In all, the rules of the fontconfig file provided by cjk-uming-fonts package should be modified to remove the "sans-serif" and "monospace" part. It would be better to add "AR PL UMing CN" for "zh-cn" language to let programs see it as a Serif font in zh-cn environment as well.

Comment 4 Mingye Wang 2018-01-08 07:29:15 UTC
Tseng, I don't have that much problem with the monospace part as UMing, like all the old Chinese fonts, is indeed a monospace. It's just I won't use it as one because my eyes would hurt…

PS: UKai has the same latin characters as UMing.

Comment 5 Cheng-Chia Tseng 2018-01-08 07:36:27 UTC
Oh, sorry that I don't find it as a Monospace font as well. :P 
Just checked, the Latin glyph width of AR PL UMing IS half the the Chinese one, so the "monospace" part can be reserved. 

The rules which should be removed are the ones about generic "sans-serif" font family.

Comment 6 Ben Cotton 2018-11-27 16:18:58 UTC
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Comment 7 Ben Cotton 2018-11-30 20:49:58 UTC
Fedora 27 changed to end-of-life (EOL) status on 2018-11-30. Fedora 27 is
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