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From: | David Nalesnik |
Subject: | Re: How to determine if a font is a fallback font? |
Date: | Tue, 28 Apr 2015 13:16:02 -0500 |
Am 28.04.2015 um 18:14 schrieb Urs Liska:
Am 28.04.2015 um 17:53 schrieb Urs Liska:
I think I have found something.
After some experimenting with a copy of font-config-get-font-file and trying different approaches I could guess from the documentations available I found that replacing an item in the FcPatternGetString call this function returns the font name and not the Postscript name or the font file.
The following preliminary function (if added to font-config-scheme.cc) returns either the Font Name (if the font exists) or "Emmentaler-11" (on my system) if it doesn't exist. I assume it would return other names on other systems:
LY_DEFINE (ly_font_config_font_exists, "ly:font-config-font-exists", 1, 0, 0,
...
Best
Urs
Wrapping this Scheme function around that:
fontExists =
#(define-scheme-function (parser location font-name)(string?)
(string=? font-name (ly:font-config-font-exists font-name)))
shows that my idea is right: The C++ function returns the family name of either the given font or the (system-dependent) fallback font. Now all there would be to it is moving the comparison of the latter Scheme function to the C++ function .
Urs
Last one for this working session: The following function ly:font-config-font-exists will return true or false depending on whether the given font is available.
The only drawback (yet) is that now the comparison is case sensitive. But *that* should be easy now?
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