import { DataReader } from '../data-reader.ts';
import { type DataWriter } from '../data-writer.ts';
import { TableBuilder } from '../table-builder.ts';
/**
 * An encoding record in the 'cmap' table.
 */
export type EncodingRecord = {
    /** The platform ID for this encoding record. */
    readonly platformID: number;
    /** The encoding ID for this encoding record. */
    readonly encodingID: number;
    /** Reads the subtable for this encoding record. */
    readonly readSubtable: () => CmapSubtable;
};
/**
 * A subtable in the 'cmap' table.
 */
export type CmapSubtable = {
    /** The format of this cmap subtable. */
    readonly format: number;
    /** The language of this cmap subtable. */
    readonly language: number;
    /** Reads the mapping of character codes to glyph indices. */
    readonly readGlyphMapping: () => ReadonlyMap<number, number>;
};
/**
 * The 'cmap' table maps character codes to glyph indices.
 */
export declare class CmapTable {
    /** The encoding records in this 'cmap' table. */
    readonly encodingRecords: ReadonlyArray<EncodingRecord>;
    /**
     * Reads a 'cmap' table from the given DataView.
     */
    static read(data: DataView): CmapTable;
    private constructor();
}
/**
 * Returns the most appropriate cmap subtable for Unicode text.
 */
export declare function selectBestCmapSubtable(cmapTable: CmapTable): CmapSubtable | undefined;
declare abstract class CmapSubtableWriter {
    readonly platformID: number;
    readonly encodingID: number;
    abstract writeSubtable(writer: DataWriter): void;
    constructor(platformID: number, encodingID: number);
}
export declare class CmapTableWriter {
    subtables: CmapSubtableWriter[];
    addSubtable(subtable: CmapSubtableWriter): void;
    writeTable(writer: DataWriter): void;
}
export declare function readCmapSubtableFormat0(reader: DataReader): CmapSubtable;
export declare function readCmapSubtableFormat4(reader: DataReader): CmapSubtable;
type CmapFormat4Segment = {
    startCode: number;
    endCode: number;
    idDelta?: number;
    glyphIdOffset?: number;
};
export declare class CmapSubtable4Writer extends CmapSubtableWriter {
    language: number;
    segments: CmapFormat4Segment[];
    glyphIds: number[];
    constructor(platformID: number, encodingID: number, segments: CmapFormat4Segment[], glyphIds: number[]);
    writeSubtable(writer: DataWriter): void;
}
export declare function readCmapSubtableFormat6(reader: DataReader): CmapSubtable;
export declare function readCmapSubtableFormat10(reader: DataReader): CmapSubtable;
export declare function readCmapSubtableFormat12Or13(reader: DataReader, format: 12 | 13): CmapSubtable;
export type CmapFormat12Group = {
    startCharCode: number;
    endCharCode: number;
    startGlyphID: number;
};
export declare class CmapSubtable12Writer extends CmapSubtableWriter {
    readonly groups: CmapFormat12Group[];
    language: number;
    constructor(platformID: number, encodingID: number, groups: CmapFormat12Group[]);
    writeSubtable(writer: DataWriter): void;
}
/**
 * Builder for the 'cmap' table.
 */
export declare class CmapTableBuilder extends TableBuilder {
    private readonly writer;
    constructor();
    /**
     * Adds a format 4 subtable to the cmap table.
     */
    addSubtable4(platformID: number, encodingID: number, segments: CmapFormat4Segment[], glyphIds: number[]): void;
    /**
     * Adds a format 12 subtable to the cmap table.
     */
    addSubtable12(platformID: number, encodingID: number, groups: CmapFormat12Group[]): void;
    writeTable(writer: DataWriter): void;
}
export {};