import type { int16, uint16 } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * BASE table - Baseline alignment data
 * Provides baseline offsets for scripts to align mixed-script text
 */
/** Baseline tags */
export declare const BaselineTag: {
    /** Hanging baseline (Devanagari, Tibetan) */
    readonly hang: 1751215719;
    /** Ideographic character face bottom edge (CJK) */
    readonly icfb: 1768121954;
    /** Ideographic character face top edge (CJK) */
    readonly icft: 1768121972;
    /** Ideographic em-box bottom edge (CJK) */
    readonly ideo: 1768187247;
    /** Ideographic em-box top edge */
    readonly idtp: 1768191088;
    /** Mathematical baseline (math layout) */
    readonly math: 1835103336;
    /** Roman baseline (Latin, Greek, Cyrillic) */
    readonly romn: 1919905134;
};
/** A single baseline value */
export interface BaselineValue {
    baselineTag: number;
    coordinate: int16;
}
/** Min/max extent values */
export interface MinMaxRecord {
    minCoord: int16 | null;
    maxCoord: int16 | null;
}
/** Feature-specific min/max values */
export interface FeatMinMaxRecord {
    featureTag: number;
    minCoord: int16 | null;
    maxCoord: int16 | null;
}
/** Base values for a script */
export interface BaseValues {
    defaultBaselineIndex: uint16;
    baseCoords: int16[];
}
/** MinMax values for a language system */
export interface MinMax {
    minCoord: int16 | null;
    maxCoord: int16 | null;
    featMinMaxRecords: FeatMinMaxRecord[];
}
/** Base script record */
export interface BaseScriptRecord {
    scriptTag: number;
    baseValues: BaseValues | null;
    defaultMinMax: MinMax | null;
    baseLangSysRecords: Map<number, MinMax>;
}
/** Axis table (horizontal or vertical) */
export interface AxisTable {
    baseTagList: number[];
    baseScriptList: BaseScriptRecord[];
}
/** BASE table */
export interface BaseTable {
    majorVersion: uint16;
    minorVersion: uint16;
    horizAxis: AxisTable | null;
    vertAxis: AxisTable | null;
}
export declare function parseBase(reader: Reader): BaseTable;
/** Get baseline value for a script */
export declare function getBaselineForScript(base: BaseTable, scriptTag: number, baselineTag: number, horizontal?: boolean): int16 | null;
/** Get default baseline for a script */
export declare function getDefaultBaseline(base: BaseTable, scriptTag: number, horizontal?: boolean): {
    tag: number;
    coordinate: int16;
} | null;
/** Get min/max extent for a script/language */
export declare function getMinMaxExtent(base: BaseTable, scriptTag: number, languageTag?: number, horizontal?: boolean): MinMaxRecord | null;