LT-22638: Show OpenType feature names and multi-valued variants#1029
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LT-22638: Show OpenType feature names and multi-valued variants#1029jasonleenaylor wants to merge 1 commit into
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- Read the font-supplied names and named options from GSUB featureParams and the name table so features are comprehensible and character variants are selectable, as with Graphite. - Add OpenTypeFontFeatureInfoReader adapted from Paratext's OpenTypeFeatures.Ttf. - Add OpenTypeFeatureCatalog registered-feature hidden and default-on classification plus English names. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
NUnit Tests 1 files ± 0 1 suites ±0 10m 51s ⏱️ + 2m 38s Results for commit b8a2dd1. ± Comparison against base commit ac89f08. This pull request removes 2 and adds 34 tests. Note that renamed tests count towards both. |
Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #1029 +/- ##
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+ Coverage 33.02% 33.09% +0.07%
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Files 1202 1204 +2
Lines 278232 278559 +327
Branches 37169 37226 +57
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+ Hits 91880 92196 +316
+ Misses 158502 158493 -9
- Partials 27850 27870 +20
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Summary
Fixes LT-22638. Makes OpenType font
features usable in Font Options: features show human-readable names from the
font (or a registered-feature catalog), and character variants with multiple
named alternates are selectable instead of a single On/Off toggle — parity with
the existing Graphite experience, with no change to the dropdown menu, so both
the Writing System and Styles font dialogs inherit it.
What changed
OpenTypeFontFeatureInfoReader(FwUtils) — parses GSUB/GPOS featurelists,
featureParams, and thenametable via a table-source delegate (GDIGetFontDatain the app, font-file bytes in tests). Bounds-checked; malformedfonts degrade to tag-only records. Adapted from Paratext's
OpenTypeFeatures.Ttf.OpenTypeFeatureCatalog(FwUtils) — classifies registered features(hidden / default-on) and supplies English names, seeded from Paratext and
audited against the OpenType registry (
dligvisible,aalthidden,kerndefault-on).
FontFeaturesButton— character variantswith named options become "None + option" submenus stored as
cvNN=k; labelsresolve font-supplied → resx → catalog → numbered fallback; default-on features
initialize enabled; hidden features filtered.
aalt,ccmp) and entries orphaned by the rewrite (ss01–ss05,ValueOff/ValueOn).Docs/opentype-font-features.mdupdated.Storage, rendering, and CSS/Word export are untouched — the renderer-neutral
tag=valuestring already carried multi-values.Testing
cv43"Capital Eng" + 3options,
ss01"Single-story a and g", GPOSmark/mkmk) and ScheherazadeNew (
cv70"Damma").priority, hidden filtering,
cv43=2round-trip, resx↔catalog consistency.catalog/info 100%, reader 86%.
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