[Indlinux-group] [Fwd]: Font autoinstallation meeting

[Mahesh T. Pai]

----- Forwarded message from Behdad Esfahbod <behdad at behdad.org> -----

 > Hi guys,
 > 
 > Lets meet Monday June 9th 17:00 UTC in ##fonts on freenode to discuss
 > font autoinstallation in Fedora.
 > 
 > I've recently committed patches to GTK+ and gnome-settings-daemon (the
 > latter not committed just yet, but expect to commit today or tomorrow)
 > to detect fontconfig configuration changes and react to it [1].  By
 > react, I mean:
 > 
 >   - Make fontconfig reread its configuration, seeing newly installed
 > fonts, changed configs, etc,
 >   - Make Pango fontmap drop its fontset caches,
 >   - Redraw all widgets.
 > 
 > With these in place, you can install a font rpm and all running
 > applications will pick it up withing 5 seconds.
 > 
 > Next logical step is to detect when fonts are missing for some language,
 > and let PackageKit offer installing them.  That's what I want to discuss
 > at the meeting.
 > 
 > To get us started, this is the very rough design I have in mind right
 > now:
 > 
 > 
 >   - Hook into PangoFcFontMap's load_fontset method, and if the font
 > pattern for the first font in the just-loaded fontset does not cover the
 > asked language, signal missing fonts for language.
 > 
 >   - The signal will be propagated to PackageKit over D-BUS
 > 
 >   - PackageKit will show a notification suggesting to install fonts for
 > langauge.  In a further dialog it will list all font packages covering
 > the missing language(s?) and let user choose which ones to install.
 > 
 > 
 > Discussion:
 > 
 >   - I don't like making Pango do much.  My previous idea was to add a
 > missing-fonts hook in Pango that another module can hook into.  I don't
 > like that idea much now.  Hooks are in general very unscalable in the
 > long run.
 > 
 >   - Here's another way to handle it:  I'm going to make some changes to
 > PangoFontMap handling.  The part relevant here is that one can call
 > pango_cairo_font_map_set_default() to change the default font map.
 > Then:
 > 
 >   - PackageKit-gnome will install a gtk-module that upon loading, gets
 > the current pangocairo defaultfontmap, subclasses it anonymously (that's
 > perfectly possible), overrides the load_fontset method, creates an
 > instance of it, and sets it as the new default pangocairo fontmap.
 > 
 >   - The hook then is responsible for using D-BUS or any other means
 > (xsettings?!) to notify PackageKit of missing fonts and at that point
 > I'm done :).
 > 
 > 
 > 
 > For this to work, it's easiest if font packages provided names like
 > font-lang-fa, font-lang-fa_IR, font-lang-az_IR, etc.  We can develop a
 > script to automatically generate that at package build time.  Fontconfig
 > already has that list.
 > 
 > 
 > Anyway, further discussion during the meeting :).
 > 
 > 
 > Cheers,
 > 
 > behdad
 > 
 > [1] http://mces.blogspot.com/2008/06/online-font-installation.html
 > 
 > _______________________________________________
 > gtk-i18n-list mailing list
 > gtk-i18n-list at gnome.org
 > http://mail.gnome.org/mailman/listinfo/gtk-i18n-list

----- End forwarded message -----

-- 
 Mahesh T. Pai <<>> http://paivakil.blogspot.com/
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