import { PdfDict } from '../pdf/objects.js';
import { PdfFile, PdfPage } from './document.js';
import { Loss } from '../core/ir/index.js';
import { FontRegistry } from '../core/font/index.js';
/**
 * Every embedded TrueType program the pages use, by the name a run will ask for
 * — the `/BaseFont` lowercased, with the subset prefix dropped.
 *
 * Each PDF font object becomes its OWN entry rather than being folded into a
 * family: `Arial-BoldMT` is a different program from `ArialMT` and the run that
 * uses it names it exactly, so nothing has to guess at weights or match faces
 * up. A face the reader cannot parse is left out and the writer substitutes for
 * it as before.
 *
 * Only `/FontFile2` is read. A CFF program (`/FontFile3`) and a Type 1 one
 * (`/FontFile`) are different formats that the layout's parser does not take;
 * those keep their substitute.
 *
 * And only one whose OUTLINES this pipeline can carry: a program with no
 * `glyf`/`loca` cannot be subset, and a face offered here is one the writer
 * will be asked to embed. bug1186827.pdf ships an OpenType/CFF program under
 * `/FontFile2`, which parses like any other and then killed the whole
 * conversion — "Subsetting requires a TrueType font with glyf+loca tables" —
 * rather than losing one face.
 *
 * @param file   The owning file.
 * @param pages  The pages whose fonts are wanted.
 * @param losses Appended to for a face the page embeds and this cannot carry.
 * @returns Name → a one-face registry holding that program.
 */
export declare function collectEmbeddedFonts(file: PdfFile, pages: ReadonlyArray<PdfPage>, losses?: Array<Loss>): Map<string, FontRegistry>;
/**
 * The name a run set in `fontDict` will ask for: its `/BaseFont` without the
 * six-capital subset prefix (§9.6.4), lowercased.
 *
 * @param file     The owning file.
 * @param fontDict A `/Font` dictionary.
 * @returns The name, or `undefined` when the font states none.
 */
export declare function embeddedFontName(file: PdfFile, fontDict: PdfDict): string | undefined;
/**
 * Whether this font carries a program this pipeline can set the page in.
 *
 * Only `/FontFile2` is liftable, and a run in such a face is filed under the
 * face's own name — so that name must be left exactly as it is. Every other
 * face is SUBSTITUTED, and its name is free to say what it is.
 *
 * @param file     The document.
 * @param fontDict The font dictionary.
 */
export declare function hasLiftableProgram(file: PdfFile, fontDict: PdfDict): boolean;