awaforge

aatAnkr

AGPL-3.0-onlyRelease 2L4

Table ankr — Anchor Points (Apple TT RM06).

Module aatAnkr | Source packages/front/office/fonts/src/extra/apple-aat/ankr.js | Deps fontErrors, fontReader | Worker-safe yes

Per-glyph anchor coordinates that kerx format 4 references. Header + lookup table (only its 2-byte lookupFormat is read — the AAT lookup formats 0/2/4/6/8/10 themselves are not decoded, no gid → block offset resolution ships) + glyph data blocks.

Exports

Symbol Type Description
parseAnkr function (bytes) => { version, flags, lookupTableOffset, glyphDataTableOffset, lookupFormat, lookupBytes, glyphDataBytes } — lookupFormat (the lookup table's first uint16) was missing from a previous revision of this page (ankr.js lines 70–80).
readAnchorBlock function (glyphDataBytes, offset) => Array<{x,y}> — a plain array, not { numAnchors, anchors } (ankr.js lines 86–98: return out;, where out is the anchor array itself).
aatAnkr factory Factory.

Usage

import fw from '@awacloud/fw';
import { fw_require, modules, extras } from '@awacloud/fonts';

for (const m of [...fw_require, ...modules, ...extras]) fw.runtime.register(m);
const { parseAnkr, readAnchorBlock } = fw.runtime.resolve('aatAnkr');
const ankr = parseAnkr(sfnt.tables.ankr.bytes);

Notes

  • No parsed/reason field signals the stub-ness of the AAT lookup decode — see ./README.md. A consumer must not assume parseAnkr's lookupBytes can be resolved from gid to a glyph-data-block offset today.
  • Requires the fonts-apple-aat bundle.

See also