[Fontconfig-bugs] [Bug 90330] Preserve binding when preparing patterns

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90330

Akira TAGOH <akira at tagoh.org> changed:

           What    |Removed                     |Added
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                 CC|                            |akira at tagoh.org

--- Comment #13 from Akira TAGOH <akira at tagoh.org> ---
The idea sounds good but:

(In reply to Behdad Esfahbod from comment #9)
> I can think of four different levels of matchness:
> 
> 1. match: user requested Arial and I found it,
> 
> 2. approximate: user requested Arial and I found Liberation Sans,
> 
> 3. fallback: user requested Arial and I found this sans-serif Persian font,
> 
> 4. no match: user requested Arial, here's some font that covers some
> characters no other font supports, and it doesn't have anything to do with
> Arial.

If we don't consider to drop adding sans-serif like we do in 49-sansserif.conf,
we won't see the result in 4. that will be always shown as a fallback in 3
then.

or we could make it conditional to query a font without a fallback perhaps
like:

<match target="pattern">
   <test name="fallback">
      <bool>true</bool>
   </test>
   <test qual="all" name="family" compare="not_eq">
        <string>sans-serif</string>
   </test>
   ...
</match>

> 
> The last one is easy to add, it's just all the matching fonts that have
> score 0 for both family-strong and family-weak match.  First one is also
> easy, that's what my patch does.
> 
> Right now 2 is also marked as match, that's because 30-metric-aliases.conf
> does binding="same".  If we remove that, then 2 and 3 will become the same. 
> I like to try to distinguish them.
> 
> So, yes, I think adding more levels to the bindings is possible.  We can
> then decide how to bucket them.  We can still bucket them into strong and
> weak and have the exact same matching algorithm that we have right now, or
> if we really wanted to, we can add more buckets.

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