import type { GlyphId, int16, uint16 } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * Legacy kern table for kerning pairs
 * Used when GPOS kerning is not available
 */
export interface KernTable {
    version: number;
    subtables: KernSubtable[];
}
export type KernSubtable = KernFormat0 | KernFormat2;
/**
 * Format 0: Ordered list of kerning pairs
 */
export interface KernFormat0 {
    format: 0;
    coverage: KernCoverage;
    pairs: Map<number, int16>;
}
/**
 * Format 2: Class-based kerning (two-dimensional array)
 */
export interface KernFormat2 {
    format: 2;
    coverage: KernCoverage;
    rowWidth: uint16;
    leftClassTable: Map<GlyphId, uint16>;
    rightClassTable: Map<GlyphId, uint16>;
    kerningValues: int16[][];
}
export interface KernCoverage {
    horizontal: boolean;
    minimum: boolean;
    crossStream: boolean;
    override: boolean;
}
/**
 * Parse kern table
 */
export declare function parseKern(reader: Reader): KernTable;
/**
 * Get kerning value from kern table
 */
export declare function getKernValue(kern: KernTable, left: GlyphId, right: GlyphId): number;