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font-match v2: fingerprint the comp lettering and pick candidates from a Google Fonts catalog index

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lib/font-fingerprint.mjs replaces the three-number fingerprint with
size-invariant shape features (x-height ratio, stroke contrast, stem width,
run-length quantiles, roundness, serif signal, width spread) and a
noise-normalized distance; family recall on a held-out self-test rose from
13% to 72% top-5. data/font-index.json carries the whole Google Fonts
catalog (3,092 faces at two cap sizes, 707 KB); font-match --rank fingerprints
the comp crop, takes the 25 nearest faces from the index (plus the model's
own names), renders them at the comp's cap height, ranks by the same
distance, and prints a proof sheet and the CSS to use. scripts/build-font-
index.mjs rebuilds the index at release time.

AI-assisted (Claude).

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Paul Bakaus
2026-08-28 06:13:59 +05:00
committed by Abdul Wahab
co-authored by Claude
parent cacb2868ac
commit 95294e464a
6 changed files with 330 additions and 7 deletions
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scripts/test-suites.mjs
+2 -1
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@@ -26,7 +26,7 @@ export const SUITES = {
triggers: [
...COMMON_INFRA_PATTERNS,
/^scripts\/(?!benchmark-detector|build-browser-detector|build-extension)/,
/^skill\/(SKILL\.src\.md|agents\/|reference\/|scripts\/(cleanup-deprecated|comp-diff|comp-spec|build-phase|font-match|concept-seed|context|context-signals|critique-storage|design-parser|doctor|hook|impeccable-paths|is-generated|lib\/(artifact-schema|png|raster|image-metrics|composition-catalog|concept-catalog|provider|staleness|staleness-deep|staleness-notice|surface-briefs|target-slug|template-extensions)|pin|surface-brief))/,
/^skill\/(SKILL\.src\.md|agents\/|reference\/|scripts\/(cleanup-deprecated|comp-diff|comp-spec|build-phase|font-match|data\/font-index|concept-seed|context|context-signals|critique-storage|design-parser|doctor|hook|impeccable-paths|is-generated|lib\/(artifact-schema|png|raster|image-metrics|font-fingerprint|font-index|composition-catalog|concept-catalog|provider|staleness|staleness-deep|staleness-notice|surface-briefs|target-slug|template-extensions)|pin|surface-brief))/,
/^README(\.npm)?\.md$/,
/^cli\/bin\//,
],
@@ -56,6 +56,7 @@ export const SUITES = {
'tests/concept-seed.test.mjs',
'tests/comp-diff.test.mjs',
'tests/build-phase.test.mjs',
'tests/font-match.test.mjs',
'tests/serve-question.test.mjs',
'tests/context.test.mjs',
'tests/context-signals.test.mjs',