Request for review and advice on wqy-bitmap-fonts fontconfig settings
Qianqian Fang
fangqq at gmail.com
Fri Nov 30 00:08:45 UTC 2007
hi
I am making some progress using the syntax in
SIGs/Fonts/Packaging/Fontconfig
<http://fedoraproject.org/wiki/SIGs/Fonts/Packaging/Fontconfig#local-specific-default-font-overrides>,
however,
there are still problems. I hope either of you can help me find out
what's wrong.
the new fontconfig file is attached. I used <alias><prefer> environments,
and renamed the file from 85 to 61 (it does not work at 85), inserted
between
60-latin and 64-nonlatin-fedora.
Now, for en locale, almost perfect, except that the last two
blocks did not seem to work (i.e. replacing WenQuanYi Bitmap Song by
Uming when pixelsize>16 and <11). You can browse
http://wqy.sourceforge.net/cgi-bin/eindex.cgi?WQYTest
to test.
For zh locales, in addition to the above problem, under monospace
(gnome-terminal),
the Latin glyphs were rendered by the wqy bitmap glyphs. I expect
those are rendered by Dejavu Sans Mono or Bitstream Sans Mono.
in either case, the output of
FC_DEBUG=4 fc-match "monospace:lang=zh-cn:pixelsize=10px"
always put wqy as the first one, this is not consistent with what
Firefox actually displayed under en locales.
Can any of you help me to find out how to get around these problems?
thank you
Qianqian
Qianqian Fang wrote:
> hi Nicolas
>
> the syntax described in Fonts/Packaging/Fontconfig
> <http://fedoraproject.org/wiki/SIGs/Fonts/Packaging/Fontconfig> seems
> not sufficient
> to accomplish the desired substitution rules.
>
> First, we want to set wqy-bitmap-fonts as the default font for
> displaying Chinese characters (for example U4E00-U9FA5, and
> U3400-U4D86 and some punctuations), for all aliases (sans/serif/mono),
> and all locales (maybe except ja/ko), only at 10px to 16px. This can
> not be done with <alias><prefer></prefer></alias> syntax (I just
> tested, it used the Latin part in wqy-bitmap-fonts in mono, and can
> not use Uming/ukai for above/below 10-16px, both of these are bad).
>
> Second, I want the system preferred Latin fonts to display the non-CJK
> part. The provided syntax, in my own opinion, can not do this either.
>
> You mention "no business touching non CJK locales," I don't fully
> agree. The default fontconfig setup for rendering Chinese webpages
> under non-zh locales is terrible. You can test this using en or other
> non CJK locales, by browsing http://wenq.org , you will see a mixed
> text rendered by Japanese fonts, uming, ukai and some Japanese/Korean
> bitmap X core fonts. In my opinion, that is non-usable. To tell the
> truth, en_US is my default locale for both office and at home. I don't
> want my desktop looks non-legible by my colleagues. However, I do want
> it to process Chinese properly. Most my Chinese friends working in the
> US have the same set up for the same reason. The default en (or non
> CJK) Chinese rendering does need to be improved (it might be more
> appropriate to handle this with Fedora font committee or some sort,
> but improving the situation by installing an additional font package
> may not a bad solution either: those who don't like it just uninstall
> this font, and everything will back to the default way).
>
> Last, the link that you mentioned does look promising:
> http://fedoraproject.org/wiki/SIGs/Fonts/Packaging/Fontconfig#local-specific-default-font-overrides
> <http://fedoraproject.org/wiki/SIGs/Fonts/Packaging/Fontconfig#local-specific-default-font-overrides>
> However, my question is, how can I make sure that the preferred Latin
> fonts (not necessarily Vera/Dejavu, could be something that user chose
> as in Andreas's case in bug #381311) overrides the Latin part of wqy?
>
> Thank you and I would be glad to hear further instructions.
>
> Qianqian
>
>
> On Nov 24, 2007 9:21 AM, Nicolas Mailhot <nicolas.mailhot at gmail.com
> <mailto:nicolas.mailhot at gmail.com>> wrote:
>
>
> Le vendredi 23 novembre 2007 à 23:25 -0500, Qianqian Fang a écrit :
>
> Hi Qianqian,
>
> > 4. Questions
> >
> > That's all I want to learn from you: do you see a robust
> implementation
> > of fontconfig font selection mechanism to achieve my goals above?
> > if yes, how? if no, to whom should I file bug reports to?
>
> I'm not sure if I've assimilated all your goals, but here are some
> comments on your fontconfig file:
>
> > <?xml version=" 1.0"?>
> > <!DOCTYPE fontconfig SYSTEM "fonts.dtd">
>
> You probably want ../fonts.dtd there but that's general XML fontconfig
> brokenness most everyone is guilty of.
>
> > <match target="pattern">
>
> I suppose this is protected by the selectfont pattern before but I'd
> avoid playing any complex substitution games when the name of an
> existing on-system font is given, and only substitute either fonts
> not
> available at all or synthetic fonts like sans-serif and friends.
>
> Also, please use a simple match with a test for family inside
> instead of
> this pattern indirection, as documented on:
> http://fedoraproject.org/wiki/SIGs/Fonts/Packaging/Fontconfig
>
> > <test equal="any" compare="eq" name="lang">
>
> > <string>en</string>
> > <string>en-us</string>
>
> You have no business touching non CJK locales, please remove this. If
> for some reason an app does not tag text with the correct locale,
> complain to its authors.
>
> http://fedoraproject.org/wiki/SIGs/Fonts/Dev/LanguageAwarenessProblem
>
> These two lines are probably responsible for most of your problem
> reports.
>
> > <string>zh-cn</string>
> > <string>zh-tw</string>
> > <string>zh-hk</string>
> > <string>zh-sg</string>
> > </test>
>
> > <test compare="more_eq" name="pixelsize">
> > <double>11</double>
> > </test>
> > <test compare="less_eq" name="pixelsize">
> > <double>16</double>
> > </test>
>
> Are you sure of the 11-16 pixel range?
>
> > <edit name="family" mode="prepend_first">
> > <string>WenQuanYi Bitmap Song</string>
> > </edit>
> > </match>
>
> > <match target="pattern">
>
> […]
>
> > <test compare="more_eq" name="size">
> > <double>8</double>
> > </test>
> > <test compare="less_eq" name="size">
> > <double>12</double>
> > </test>
>
> Point sizes have no meaning for bitmap fonts, unless you assume a
> fixed
> point/pixel ratio, which is not hardware reality. Dump this match
> block
> it's actively evil.
>
> > <edit name="family" mode="prepend_first">
> > <string>WenQuanYi Bitmap Song</string>
> > </edit>
> > </match>
>
>
> > <match target="pattern">
> > <test equal="any" compare="eq" name="family">
> > <string>WenQuanYi Bitmap Song</string>
> > </test>
> > <test equal="any" compare="eq" name="family">
> > <string>monospace</string>
> > </test>
> > <edit name="family" mode="prepend">
> > <string>Bitstream Vera Sans Mono</string>
> > </edit>
> > <edit name="family" mode="prepend" binding="strong">
> > <string>DejaVu LGC Sans Mono</string>
> > </edit>
> > </match>
>
> If you didn't touch non-CJK locales before you wouldn't need this
> bandaid. Also you're assuming some other fonts are present on system
> which may not be the case. Our default latin font list is dynamic and
> changes from release to release, and depending on what font packages
> users actually install.
>
> If you really want Vera or DejaVu to override WenQuanYi Bitmap Song
> contents, the override should be added to the fontconfig file those
> fonts ship.
>
> Wouldn't a simple
> http://fedoraproject.org/wiki/SIGs/Fonts/Packaging/Fontconfig#local-specific-default-font-overrides
> rule with additional pixel range restriction be sufficient for your
> needs?
>
>
> Regards,
>
> --
> Nicolas Mailhot
>
>
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