[Fontconfig] Detecting whether a font is a fallback

[Jean Abou Samra]

Hi,

Suppose I call FcFontMatch on a font pattern with a family name that doesn't exist on my system. I get some default system font.

Is there a reliable way to tell whether the FcPattern I get is for a fallback font like this? I could compare the two FC_FAMILY values, but it seems that Fontconfig does some case transformations —
and possibly other things like replacing dashes? Is there a simple way to know if two FC_FAMILY strings match? Is there a better approach that I'm missing?

This is for LilyPond, which has ways of configuring fonts, and where we'd like to display a warning if a font is not found (unlike a GUI application, which just wants to display the text even if it's
in a suboptimal font).

Thanks,

Jean

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