Re: How to determine if a font is a fallback font?

[Urs Liska]

Am 28.04.2015 um 16:50 schrieb Cynthia Karl:
> > Message: 6
> > Date: Tue, 28 Apr 2015 09:48:51 +0200
> > From: Urs Liska <address@hidden>
> > To: Werner LEMBERG <address@hidden>
> > Subject: Re: How to determine if a font is a fallback font?
> >
> > Am 28.04.2015 um 09:38 schrieb Werner LEMBERG:
> > > > Is there a function to retrieve the "font name" from a given file
> > > > name?  It would be a viable approach if I could compare the result
> > > > of that request with the original font name.
> > > For TTFs and TTCs (either with TrueType outlines or embedded CFFs) you
> > > can use `ly:ttf-ps-name'.
> > Thanks that seems to work perfectly. Try
> >
> > \version  "2.19.19"
> >
> > fontExists =
> > #(define-void-function  (parser location font-name)(string?)
> >     (let*  ((font-file (ly:font-config-get-font-file  font-name))
> >            (reverse-font-name (ly:ttf-ps-name  font-file))
> >            (font-exists (string=?  font-name reverse-font-name)))
> >       (ly:message  (format  "\nGiven font name: ~a"  font-name))
> >       (ly:message  (format  "Determined font file: ~a"  font-file))
> >       (ly:message  (format  "Actual font in that file: ~a"  reverse-font-name))
> >       (ly:message  (format  "Given font is present: ~a"  font-exists))))
> >
> > \fontExists  "Emmentaler-13"
> > \fontExists  "Fancy-Font"
> >
> >
> > > Looking into lilypond's code, however, I don't see why this shouldn't
> > > work for Type1 fonts (or even pure CFFs) also.  It's worth a try ? and
> > > if it works, we should provide an alias name for `ly:ttf-ps-name'.
> > I don't know how to proceed with this.
> >
> > However, in the context of my current patch I will add a variant of the
> > above function to font.scm.
> I tried the above snippet with:
>
> \fontExists  "Emmentaler-13"
> \fontExists  "Fancy-Font"
> \fontExists "Ariel"
> \fontExists "Ariel Black"
> \fontExists "LucindaGrande"
> \fontExists "Feta-13"
> \fontExists "Minion Pro"
> \fontExists "Century Schoolbook"
> \fontExists “Avenir”
>
> In each case, even for the case “LucindaGrande”, I get (with the correct Given 
> font name):
>
> Given font name: LucindaGrande
> Determined font file: /System/Library/Fonts/LucidaGrande.ttc
> Actual font in that file: LucidaGrande
> Given font is present: #f
>
> That doesn’t seem right.  Any clues?  Or is it right?

I see that you give "LucindaGrande" and the retrieved font name is 
"LucidaGrande" without the *n*.
Therefore the comparison returns #f.

But anyway this appraoch is flawed as its input is a "font name" and its 
output the "Postscript name".

Currently I'm trying to wrap my head around this and try to convince 
Freetype/fontconfig (or C++) to determine if there is actually a 
non-replaced font available and to modify the return value accordingly.

Urs

> > Re: How to determine if a fon
> >
> > Urs