A font library can hold two versions of one family and style (a new
Montserrat-Bold.ttf beside an old montserrat.ttf). The font database kept
only the first one loaded, so type set in the other couldn't be matched
when a PDF or .ai was opened: it came in as outlines. Now every version
loads (the first stays the one family and style resolve to), PDF import
tries the other versions when the glyphs differ, and type set in a version
the family and style alone wouldn't pick names it in CharStyle::font_version
(left out when None, so documents without it are unchanged). Layout,
shaping, the substituted-glyph highlight, Find Font, Package and Document
Info follow it; changing the font clears it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Upright glyphs in vertical type advanced one em (or their horizontal
advance, if wider) and turned about a fixed point 0.38 em above the
baseline. Fonts that carry vertical metrics now place them as they ask:
- `FontFace::vertical_glyph`: a glyph's advance down the column (`vmtx`)
and the height of its vertical origin (`VORG`, else the glyph's top
plus its top side bearing, as in TrueType fonts); `None` without
`vhea`/`vmtx` or with values outside a few ems.
`FontFace::ideographic_centre`: the em box centre from an ideograph's
cell, else 0.38.
- The layout advances an upright glyph by its vertical advance and hangs
it from its vertical origin; tate-chu-yoko blocks and point type's
anchor use the font's em box centre. Fonts without vertical metrics
are laid out exactly as before.
- Hiragino's tables give the values the layout assumed (one em, origin
0.88 em), so Japanese vertical type in it renders pixel for pixel the
same; this is the base for proportional vertical metrics (`vpal`) and
for fonts whose em box sits elsewhere.
- `test_fonts::vertical_font`: Source Sans 3 with `vhea`/`vmtx` (and
optionally `VORG`) built in code, one glyph 1.4 em tall hanging from
1.1 em; tested with and without `VORG`.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The font database made one style per font file, so a variable font
such as Figtree[wght].ttf listed only its default instance (Light).
Faces now also yield their fvar named instances, each a style of the
family named by its subfamily name (the default instance is the face
itself; unnamed or duplicate instances are left out; axes and
instances read are capped). The system font scan reads the fvar table
beside the name table, so installed instances are listed before the
file is loaded and found by name and by PostScript name.
An instance face carries its axis settings: skrifa draws its outlines
and reads its metrics and advances at that location, harfrust shapes
with a ShaperInstance, so layout, the canvas, Create Outlines and hit
testing all use the instance. PDF export embeds it through krilla's
Font::new_variable, SVG @font-face through subsetter's
subset_with_variations: both write a static font of that instance.
Tests build a small variable font in code (test_fonts, via
write-fonts; no font file is committed) and check listing, resolving,
glyphs and advances, PDF and SVG export and damaged fvar/gvar tables;
Bahnschrift and Segoe UI Variable are checked where installed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
