[Bug 621445] .conf should use 65-0 to override 65-non-latin TSCu_Paranar

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https://bugzilla.redhat.com/show_bug.cgi?id=621445

--- Comment #3 from K. Sethu <skhome at gmail.com> 2010-08-05 02:34:10 EDT ---
(In reply to comment #2)
> (In reply to comment #6)
> > 
> > 1) The current 66-lohit-tamil.conf does not supersede 65-nonlatin.conf for
> > "sans-serif".  65-nonlatin.conf has TSCu_Paranar font at priority above Lohit
> > Tamil;  and so if TSCu_Paranar Regular and / or TSCu_Paranar Bold are fonts are
> > installed then for sans-serif TSCu_Paranar regular is matched by fontconfig if
> > Regular only or both Regular and Bold are installed. If only Bold is installed
> > then it is matched to sans-serif.   Only if both regular and bold of
> > TSCu_Paranar are NOT installed then Lohit Tamil gets matched to sans-serif.
> 
> Yes, i will fix this by making lohit tamil priority 65-0
> 

To supersede with language specific matching from above (i.e. in
/etc/font/conf.d/ with a config file link name starting with less than 65-n to
supersede 65-nonlatin.conf) there is another method not using mode="prepend" .
That method is not included in the Fedora tips at :
http://fedoraproject.org/wiki/Fontconfig_packaging_tips#Locale-specific_overrides 

For the other method we make 65-lohit-tamil.conf as follows :

-----------------------------------------------------
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Tamil (ta) -->
<match target="font">
        <test name="lang" compare="contains">
                <string>ta</string>
        </test>
        <alias>
                <family>sans-serif</family>
                <prefer>
                        <family>Lohit Tamil</family> 
                </prefer>
 </alias>
</match>

<!-- Tamil (ta) ends -->
</fontconfig>
---------------------------------------------------------

Then since 65-lohit-tamil.conf is less than 65-nonlatin.conf the above should
supersede 65-nonlatin.conf . Though I have not tested yet with 65 (which I will
do later tonight) using 63,  I have found that the above matches sans-serif
with Lohit Tamil for Tamil language contents but not for any other languages,
and regardless of the locale in which desktop is operated. 

> > 
> > 2) Similarly if gnu-free fonts are installed then due to
> > 60-gnu-free-serif.conf, for serif, it is FreeSerif font that is matched by
> > fontconfig.
> 
> This is really bug from gnu-free fonts, they should not use this priority
> see "/usr/share/fontconfig/templates/fontconfig-priorities.txt"
> 
> "65-69 Fonts with less common encodings, ending with fonts that provide,       
> coverage of exotic unicode blocks at the expense of drawing,quality"
> 
> should report bug against them
> 

But in Ubuntus installing the deb package for the same Free Fonts does not pump
in the 60-gnu-free-serif.conf, 60-gnu-free-sans.conf and 60-gnu-free-mono.conf
. Aren't those inclusions in Fedora made by Fedora's packagers for gnu-free ? 

> but one more thing 
> gnu-free providing serif fonts, and lohit is sans
> so it is ok if gnu-free get selected for
> fc-match serif:lang=ta    

There are some contents in web sites, such as some buttons in ta.wikipedia.org
are detected as serif and when FreeSerif is matched to serif those content, if
in bold, do not get rendered since the bold version of Free Serif does not have
Tamil glyphs. Also FreeSerif regular font's coverage of Tamil glyphs is not
comprehensive with many symbols and some late additions to Unicode missing. I
will attach some screen shots later tonight to show those problems.

K. Sethu

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