[Fontconfig] Streamlining fontconfig scanning

[Behdad Esfahbod]

On Tue, Aug 8, 2017 at 3:44 PM, Jerry Casiano <jerrycasiano at gmail.com>
wrote:

> Nice!
>
> I assume FcCharset is here to stay even if it might not be as accurate as
> it was before, correct?
>

Of course.  That's the main machinery for fallback.


> I'm guessing FcBlanks just wasn't something anybody used anyway.
>

Right.  It was only useful to the extent that we did not trust fonts to
have correct cmap.


> On Aug 7, 2017 1:31 PM, "Behdad Esfahbod" <behdad at behdad.org> wrote:
>
>> Hi everyone,
>>
>> I have a proposed patchset speeding up fontconfig scanning by 10x, simply
>> by not loading glyphs at all, and trusting fonts having correct cmap:
>>
>>   https://bugs.freedesktop.org/show_bug.cgi?id=64766#c56
>>
>> If no one has comments, I like to merge this and get it out for testing
>> in the wild.
>>
>> After this, I think we should fix the relocatable feature to not touch
>> mmaped cache files.  Here's my proposed approach:
>>
>>   https://bugs.freedesktop.org/show_bug.cgi?id=101889#c17
>>
>> After that, we should clean up the cache race patches and remove the
>> locking.  We should accept that cache updates will always remain racy,
>> simply because we don't have or want to use the kinds of synchronization
>> primitives that guarantee no race.  With scanning 10x faster this shouldn't
>> be a problem in practice.  I like to get back to each process trying to
>> update the cache and possibly discarding its result if another process
>> already did...
>>
>> Cheers,
>>
>> --
>> behdad
>> http://behdad.org/
>>
>> _______________________________________________
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>> Fontconfig at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/fontconfig
>>
>>


-- 
behdad
http://behdad.org/
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