freebsd-dev/contrib/groff/font/devutf8/NOTES

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Note that all `charXXX' entity names have been removed from the font files.
They don't make sense for Unicode.
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The following from the original troff manual (by Ossanna and Kernighan) is
unmapped:
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\(bs shaded solid ball (Bell System logo, AT&T logo)
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Character 0x002D has not been given a name because its Unicode name
"HYPHEN-MINUS" is so ambiguous that it's unusable for serious typographic use.
The following, mentioned in the original troff manual, are only approximate:
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\(lk middle part of big left curly brace
\(rk middle part of big right curly brace
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\(wp has been mapped to 0x2118, because according to unicode.org's
NamesList-3.0.0.txt, U+2118 "SCRIPT CAPITAL P" is really a Weierstrass p,
neither SCRIPT not CAPITAL.
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The following line could be added; "space" is known to "devps" but are not
documented and not known to "devdvi" (actually, there is no space glyph
within the TeX system).
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space 24 0 0x0020
The following lines could be added, to define names which are known to e.g.
"devdvi" but are not known to "devps".
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<< 24 0 0x226A
>> 24 0 0x226B
"devps" maps \(a~ and ~ to asciitilde, which is equivalent to 0x02DC, but
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this glyph is just too small. We map them to 0x007E instead.
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"devps" maps \(a^ and ^ to circumflex, which is equivalent to 0x02C6, but
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this glyph is just too small. We map them to 0x005E instead.
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"devps" maps *U to Upsilon1, which is equivalent to 0x03D2. We map it to
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0x03A5 instead.
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"devps" maps *W to Omega, which is equivalent to either 0x2126 or 0x03A9.
We map it to 0x03A9.
"devps" maps *D to Delta, which is equivalent to either 0x2206 or 0x0394.
We map it to 0x0394.
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"devps" maps CR to carriagereturn, which is equivalent to 0x21B5. We map
it to 0x240D instead.
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Using unnamed characters
------------------------
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Assume you want to use a Unicode character not provided in the list, say
U+20AC. You need to do two things:
- Add a line
--- 24 0 0x20AC
(the second column is computed as 24 * wcwidth(0x20AC)) to the file
R.proto, or, when groff is already installed, to the four fonts files in
$(prefix)/share/groff/<version>/font/devutf8/.
- In your source file, use the notation \N'8364' where 8364 is the decimal
representation of 0x20AC.