Importing missing glyphs in font

Question

I'm using a title font which has very few characters, and I need '+' and '=' for a given title, which are missing. Using fontspec, is it possible to import only these two missing glyphs from another font?

Note: it is a very similar question to this one, but I'd like to know if it can be done easily with fontspec.

That is a good idea, but my title font is scaled (huge is not big enough for my needs), so the math font doesn't scale the same. — raphink, Aug 12 '11 at 11:12
@Ulrike: that would work too, but I wanted to know if there was a cleaner way (just in case). — raphink, Aug 12 '11 at 14:44
The clean way is to use a better font. All other solutions involve a font switch which you can do in various ways (commands, \XeTeXinterclass) but still is a font switch. — Ulrike Fischer, Aug 12 '11 at 15:07

score 3 · Accepted Answer · answered Aug 12 '11 at 20:46

If the symbols are used only in a few cases, the most efficient solution is to define \newcommand{\biggerplus}{{\myplusfont +}}, where \myplusfont is the declaration for choosing the substitute font.

If you really need to use directly + and =, then I suggest

\newfontfamily{\mytitlefont}{Some Font}
\newcommand{\choosetitlefont}{\mytitlefont\mytitlefonttrue}
\newif\ifmytitlefont
\let\pluschar=+
\catcode`+=\active
\protected\def+{\ifmytitlefont{\myplusfont\pluschar}\else\pluschar\fi}
\let\equalschar==
\catcode`==\active
\protected\def={\ifmytitlefont{\myplusfont\equalschar}\else\equalschar\fi}

Instead of calling \mytitlefont for typesetting the titles, you'll call \choosetitlefont.

Solutions with \XeTeXintercharclass would avoid activating the characters, but will have the conditional anyway.

Importing missing glyphs in font

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