[Fontconfig] Matching font by unicode coverage

[Sam Varshavchik]

I'm learning the fontconfig API, and I'm trying to figure out how to do the  
following.

I have arbitrary Unicode text, and I would like to match a reasonable font  
to use for displaying it. It's possible that I might need more than one font  
if, say, the text is a mixture of Latin characters and Asian ideographs.

I see that FC_CHARSET is an option to FcPattern. Does this sound like I'm on  
the right track:

A) Construct an FcCharset and add all unicode characters in the text to  
display

B) Add it as a FC_CHARSET value to an FcPattern.

C) Use FcFontList() to search for the matching font.

The developer reference contains the following statement: "Fontconfig uses  
some of these properties for font matching and font completion. Others are  
provided as a convenience for the application's rendering mechanism."

So, I guess I'm trying to clarify whether I can use the FC_CHARSET property  
to search for fonts that have coverage for my unicode text, or if this a non- 
searchable property, only.

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