Re: Format of -dshow-available-fonts output

[Urs Liska]

Hi Aaron, thanks for the hints.


Am 17.07.2018 um 16:14 schrieb Aaron Hill:
> On 2018-07-17 02:27, Urs Liska wrote:
> > Hi, when running with the -dshow-available-fonts option I get (among
> > others) a list of font familes with entries like the following:
> >
> > family Verdana
> >
> > Verdana:style=Standard,Normal,obyčejné,Κανονικά,Regular,Normaali,Normál,Normale,Standaard,Normalny,Обычный,Normálne,Navadno,Arrunta 
> >
> > family Kepler Std
> >  Kepler Std,Kepler Std Light Cn Disp:style=Light Condensed 
> > Display,Regular
> >
> > What do the different output formats refer to: some with a ":style="
> > part, some with direct font names.
> >
> > And in some cases I find multiple entries for a font family
> >
> > family Helvetica LT Std
> >  Helvetica LT Std:style=Oblique,Italic
> > family Helvetica LT Std
> >  Helvetica LT Std,Helvetica LT Std Cond:style=Bold Condensed,Bold
> > family Helvetica LT Std
> >  Helvetica LT Std,Helvetica LT Std Cond:style=Condensed,Regular
> >
> > (with many more entries in this case).
> >
> > And these mixes of font name conventions:
> >
> > family Helvetica Neue LT Std
> >  Helvetica Neue LT Std,HelveticaNeueLT Std Cn:style=77 Bold Condensed
> > Oblique,Bold Italic
> >
> > I'm somewhat confused what to make out of this diverse information.
> >
> > I'm looking into this because I'd like to try making a better dialog
> > for showing fonts in Frescobaldi.
>
> Here is documentation on FontConfig's naming convention:
>
> https://www.freedesktop.org/software/fontconfig/fontconfig-user.html#AEN36 
>
>
> LilyPond's output is similar to what you get from `fc-list : family 
> style`.

Unfortunately I still don't get it.

If I have a family of "Libre Baskerville Condensed" and the detail 
string "Libre Baskerville Condensed:style=Italic"
this probably means the italic variant of that font. And in fact there 
are three instances of that font with three different styles.

And "Monotype Modern Std,Modern MT Std Condensed:style=Condensed,Regular"
Is it possible that the styles are listed in reverse order?

> Oddly, LilyPond has support to show the file path for a font, but it 
> doesn't select that property when building the object set.  In 
> font-config-scheme.cc:85 (as of 2.19.82), the call to FcObjectSetBuild 
> probably should include FC_FILE as well.
>
> On your system, try running `fc-list : file family style`.  You can 
> see if the file paths are unique for the apparent duplicates you are 
> seeing, which is what I would expect to be the case.

Well, it seems apart from the fact that some font files seem to be 
duplicated on my system it seems that many font families are not 
reported in one step but in multiple steps that have to be merged manually.

I'll do some tests and may report back.
Urs

> -- Aaron Hill
>
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