import { ParsedTtf } from './ttf-parser.js';
/**
 * Subset a TrueType font to the glyphs in `usedGids` (plus their composite
 * components and GID 0). All tables are kept intact so the CIDFontType2
 * `/CIDToGIDMap /Identity` contract holds; only `glyf`/`loca` are rebuilt, with
 * unused glyphs zero-length.
 *
 * @param parsed   The parsed source font (must have `glyf` + `loca`).
 * @param usedGids The glyph ids actually used.
 * @returns The subset font bytes.
 * @throws Error when the font has no `glyf`/`loca` (e.g. a CFF/OTF font).
 */
export declare function subsetTtf(parsed: ParsedTtf, usedGids: Iterable<number>): Uint8Array;
/**
 * The glyph ids actually present in a subset for `usedGids`: the seeds, their
 * composite components (transitively) and GID 0. With Identity CID↔GID this is
 * exactly the CID set of the embedded subset, used to build the PDF/A `/CIDSet`
 * (ISO 19005-1 §6.3.5). Mirrors {@link subsetTtf}'s own closure.
 *
 * @param parsed   The parsed font.
 * @param usedGids The seed glyph ids.
 * @returns The closed set of glyph ids.
 */
export declare function glyphClosure(parsed: ParsedTtf, usedGids: Iterable<number>): Set<number>;