[tannevaled]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/go-opentype/opentype	v0.17.0 → v0.18.0

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Release Notes

go-opentype/opentype (github.com/go-opentype/opentype)

v0.18.0

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GPOS kerning now follows the spec's two different stopping rules instead of one.

A pair covered by an early kern lookup with an explicit zero reported no kerning at all, because Kern returned at the first lookup whose pair-adjustment subtable covered the pair. OpenType stops at the first matching subtable within a lookup, but processes lookups in LookupList order, each acting on the previous ones' results — so their adjustments add (spec, chapter 2).

Libertinus Serif files four separate kern feature records: its lookup 0 covers A/V with 0 and its lookup 6 covers the same pair with −112. Every AV in that family came out 1.12pt too wide at 10pt.

Kerner.Kerning also now asks whether GPOS covered the pair rather than whether it answered non-zero — a zero in a pair-adjustment lookup is the font saying "no adjustment between these two", which is an answer. A pair no GPOS lookup mentions still falls through to the legacy kern table.

Measured, in font units

pair	before	after
Libertinus Serif AV	0	−112
Libertinus Serif To	0	−63
TeXGyreTermesX AV	−130	−130 (control)
TeXGyreTermesX To	−90	−90 (control)

Downstream, go-tex's \hbox{AV} at 10pt in Libertinus went from 13.47pt to 12.35pt, against XeTeX's 12.35pt.

This is a minor rather than a patch because it changes the kerning a caller gets for any font that files a pair in more than one lookup; a downstream fidelity floor measured against the old values will need re-measuring.

#​63

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v0.17.1

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What's Changed

• README: the OS/2 line metrics, and which set Ascent/Descent belong to by @​tannevaled in #​58
• fix(deps): update module github.com/andybalholm/brotli to v1.2.8 by @​tannevaled in #​60
• NewFaceAt: a face at a fractional size, for a caller that counts finer than a pixel by @​tannevaled in #​62

Full Changelog: go-opentype/opentype@v0.17.0...v0.17.1

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