Highlight Alternate Glyphs compares each glyph with required shaping
alone, which turns liga and calt off. Older Arabic fonts (such as the
legacy Arial of the Microsoft core fonts) put the mandatory lam-alef
ligature in liga instead of rlig, so every lam-alef was highlighted.
A lam + alef cluster (any alef form, marks allowed) is now never an
alternate candidate, whatever feature the font uses.
Adds a test font built in code (lam-alef under liga or rlig) and
host-independent regressions. Also two equivalent one-line repairs
strict Clippy needs on main: a nonminimal_bool in the Path Precision
Tools inspect check and is_none() in a gradient panel test.
Given a family and no font style, text.create and text.createInPath
kept the default Regular, and text.setStyle kept the text's previous
style, even when the family has no such style. A family whose styles
are numbered (Hiragino W3, W6) has no Regular, so the file named a
font that isn't installed and opened with Missing Fonts.
They now keep the style when the family has it, else take the
family's closest one, as text.setRangeStyle already did. Its rule
moves to `textedit::fit_font_style`, which the three commands share;
Graph labels styled through text.setStyle follow it too. A style the
caller names is kept as given.
The test builds a family with W3 and W6 and no Regular in code
(`test_fonts::numbered_font`), so no font file is added.
A variable font's COLR layers follow its instance, a colour glyph turns with type on a path, and the canvas draws an SVG glyph's art in its own colours and the type's fill.
a_zero_width_joiner_in_devanagari_asks_for_a_half_form took any
fallback face whose GSUB script list holds dev2 or deva, and then
asserted that Ka takes its half form. A face with the script tag and
no half form for Ka failed the test, although the text was shaped in
the fallback face as the test checks.
The test now takes a fallback face only when the face lists dev2 or
deva and Ka + halant + ZWJ + Ssa set in that face alone starts with
Ka's half form and ends with Ssa. It prints SKIPPED when no installed
face does. A new test runs the filter on two faces built in code that
both list dev2. It takes the face with a half feature and passes
over the face without one.
VectorCraft listed a variable font's named instances as styles, but
type could not be set between or past them. The reference app's
Character panel has a Variable Font control that adjusts a variable
font's axes, such as Weight, Width and Slant.
Type now keeps Variable Font settings by axis tag
(CharStyle::font_axes, saved as fontAxes only when set). text.setFormat
and text.setRangeStyle take fontAxes: each value is clamped to its
axis's range, a tag the font has no axis for is left out, and null
goes back to the style's own setting. Another font or style clears
them, including one from a character style that does not set them. A
character style captured from type sets them, with {} for none.
text.fontList {family, style} lists a font's axes.
Layout, outlines, the substituted-glyph highlight and PDF export use
the font instanced at the settings, and neighboring runs at different
settings are shaped apart, as runs in different fonts are. SVG export
writes them as font-variation-settings, the wght setting as the weight
and the wdth setting as font-stretch, and embeds the font instanced
there; SVG import reads font-variation-settings back. Legacy .ai export
warns that the settings are left out.
The Character panel shows a Variable Font button for a variable font.
It opens a slider and a field for each axis the font does not hide,
labeled with the font's name for the axis, and screen readers get each
slider under that name. A drag is one undo step. Reset Panel leaves
the settings, as it leaves the font and style.
Missing Glyph Protection now keeps the settings and the font version
on the characters that keep their font; before, it kept only the
family and style. A character style applied or redefined with another
font now clears the old font's version, as text.setStyle does, unless
the style sets one. SVG export with embedded fonts warns when faces of
one weight, style and width share characters, which browsers then draw
in one of the faces.
Docs: docs/mcp.md, docs/target-app-parity.md, docs/type-parity.md.
Each style run was shaped on its own, so restyling one character, even
only its fill, dropped the font's kerning pairs at the new run
boundaries. A fill change on the V of 40 pt "AVAV" moved it 0.56 pt and
moved the characters after it 1.12 pt. Manual kerning on a character
also dropped the font's kerning with the character before it.
Adjacent runs that differ only in fill, stroke, underline,
strikethrough, overprint, character style name, leading, baseline
shift, rotation, Character Alignment, kerning, or tracking (as long as
both values leave standard ligatures on or both turn them off) are now
shaped together, and each glyph takes those attributes from its own
run. The font's kerning pairs apply after characters with automatic
kerning: a manual value replaces the pair after its character, and the
pair before it stays, except before a character that All Caps or Small
Caps sets as two letters (ß as SS). A change of font, size, scale or
OpenType features still shapes the characters apart, and a ligature or
a mark still does not join characters in different styles.
Docs: docs/target-app-parity.md.
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>
Don Omondi