[Fontconfig] Matching font by unicode coverage

[Sam Varshavchik]

Akira TAGOH writes:

> That way is what Pango do to figure out the glyph coverage in fonts. they  
> convert the result into their own structure so that it's not that easy to  
> find out a font that have the certain coverage in fontconfig only.

You mean match by FC_CHARSET? That was the first part of what I'm trying to  
figure out, whether creating an FcCharset containing the unicode characters  
in the text, and then trying to match a font using it, will work.

> On Mon, Jan 19, 2015 at 12:51 PM, Sam Varshavchik <<URL:mailto:mrsam at courier- 
> mta.com>mrsam at courier-mta.com> wrote:
>
>    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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