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Administrator
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Dear community,
This is an advisory about two changes
to the font-specific metadata format that will be published in the next
revision of the SMuFL specification, which is coming soon.
1. Additional 'alternateFor' key
in the 'sets' structure.
The "sets" structure defines
a short, predefined list of specific sets of alternate glyphs. At present,
the five valid sets are for straight flags, short flags (to avoid augmentation
dots), optically-sized variants for small staff sizes, large time signature
digits, and oversized noteheads (the latter being the most recent addition).
Here is an example of a bit of this structure:
{
...
"sets": {
"ss05":
{
"description": "Noteheads at larger optical size
",
"glyphs": [
{
"alternateFor": "noteheadDoubleWhole",
"codepoint": "U+F4BA",
"name": "noteheadDoubleWholeOversized"
},
...
],
"type": "noteheadsLarge"
}
}
...
}
The new 'alternateFor' field lists the
glyph name of the recommended character for which this specific glyph is
an alternate.
Note that the generate_font_metadata.py
script does not export the "sets" structure at all. Font designers
should adapt the "sets" structure from the bravura_metadata.json
file that is distributed along with Bravura, substituting the appropriate
code points for the new font in the optional range for the ones from Bravura.
2. New 'optionalGlyphs' structure.
The new "optionalGlyphs" structure
is intended to list the name, code point, and (optionally) the class of
every glyph in the optional range (U+F400–U+FFFF), so that consuming applications
can get an overview of the non-core glyphs included in the font. This is
what a bit of this structure looks like:
{
...
"optionalGlyphs":
{
"4stringTabClefSerif":
{
"classes": [
"clefs"
],
"codepoint": "U+F40D"
},
"accdnPushAlt":
{
"classes": [],
"codepoint": "U+F45B"
},
...
}
...
}
The structure uses the glyph name of
each optional glyph as the primary key.
We have uploaded an update to the generate_font_metadata.py
FontLab script that will export this structure, provided each glyph has
its name entered as a "note" (right-click the glyph and choose
Add Note... to edit the note for each glyph). It cannot export the "classes"
data, as that is not encoded in the font itself, but hopefully it won't
be too much of a hardship to add the class names manually.
If you have any questions about these
additions, let me know.
Daniel
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Steinberg Media Technologies GmbH, Frankenstrasse 18b, D-20097 Hamburg, Germany
Phone: +49 (40) 21035-0 | Fax: +49 (40) 21035-300 | www.steinberg.net
President: Andreas Stelling | Managing Director: Hiroshi Sasaki, Hirofumi Osawa
Registration Court: Hamburg HRB 86534
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