[Fontconfig] Application fonts with Pango+fontconfig

Behdad Esfahbod behdad at behdad.org
Tue May 12 13:20:24 PDT 2015

On 15-05-12 01:17 PM, Behdad Esfahbod wrote:
> On 15-05-10 12:10 PM, Khaled Hosny wrote:
>> On Fri, May 01, 2015 at 07:19:11PM -0400, Behdad Esfahbod wrote:
>>> Hi all,
>>> I am at the Libre Graphics Meeting in Toronto this week, which meant that I
>>> got to talk to GIMP and Inkscape developers after many years, and was reminded
>>> that Pango still doesn't make it easy to use custom (aka application fonts),
>>> and it still does not allow one to turn OpenType features on or off.  So I
>>> ended up doing a complete review of the stack, fixed small stuff, filed many
>>> bugs, and documented it all.  Details here:
>>> http://mces.blogspot.ca/2015/05/how-to-use-custom-application-fonts.html
>>> Hopefully we can make the next release of the stack much better, and work with
>>> app developers to integrate these.
>> I gave it a try[1] and it seems to work for my use case (I don’t even
>> need to select a Pango font, since might is the only one Pango seems to
>> just pick it), with one glitch: If the font gets changed while the
>> viewer is open (e.g. adding or removing glyphs), Pango will start
>> drawing garbage glyphs (seems to be using the old glyph indices) even
>> though I recreate the config, fontmap, layout and everything. This is
>> specially important for this application as I use it to test fonts while
>> I’m working on them, not sure if it is that relevant for common use
>> cases.
> That's so weird.  How do you test this?
> I just ran it, and if I copy a new font on top of the filename, the app
> instantly picks it up (I'm not sure how!), but there doesn't seem to any issue
> with glyph numbers.  I tested copying NotoNastaliq and IranNastaliq on top of
> each other and it works just fine.

Ignore that.  I was testing with an old binary apparently.  Let me fix this.

>> This seems to be a general Pango issue, if I modify a font while
>> an application is using it, I get similar issues. 
>> Regards,
>> Khaled
>> 1. https://github.com/khaledhosny/fontview/commit/0353750


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