awaforge

fontTtc

AGPL-3.0-onlyRelease 2L4

TTC/OTC container — Font Collection (OT §5).

Module fontTtc | Source packages/front/office/fonts/src/sfnt/ttc.js | Deps fontErrors, fontsShared, fontReader, fontWriter, fontTag | Worker-safe yes

Reads the ttcf header and exposes each member font. extractFont(bytes, i) reconstructs a standalone TTF/OTF SFNT from the shared offsets.

Exports

Symbol Type Description
TTC_MAGIC const 0x74746366 ('ttcf').
parseTtc function (bytes) => { ttcTag, majorVersion, minorVersion, numFonts, offsets }.
extractFont function (bytes, index) => Uint8Array (standalone SFNT).
ttcFontTagAt function Returns the sfntVersion tag of font #index without extracting it.
fontTtc factory Factory { name, dependencies, factory }.

Usage

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

for (const m of [...fw_require, ...modules]) fw.runtime.register(m);
const { parseTtc, extractFont } = fw.runtime.resolve('fontTtc');
const head = parseTtc(ttcBytes);
const firstFont = extractFont(ttcBytes, 0);

Notes

  • TTC v2 DSIG is ignored (optional field not read).
  • extractFont recomputes searchRange/entrySelector/rangeShift via sfntSearchParams.

See also