import type { GlyphId, uint16, uint32 } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * Horizontal Metrics Variations table (HVAR)
 * Provides variations for horizontal advance widths and LSB
 */
export interface HvarTable {
    majorVersion: number;
    minorVersion: number;
    itemVariationStore: ItemVariationStore;
    advanceWidthMapping: DeltaSetIndexMap | null;
    lsbMapping: DeltaSetIndexMap | null;
    rsbMapping: DeltaSetIndexMap | null;
}
/**
 * Item Variation Store - stores delta values for variations
 */
export interface ItemVariationStore {
    format: number;
    variationRegions: VariationRegion[];
    itemVariationData: ItemVariationData[];
}
/**
 * Variation region defines the space where deltas apply
 */
export interface VariationRegion {
    regionAxes: RegionAxisCoordinates[];
}
/**
 * Axis coordinates for a region
 */
export interface RegionAxisCoordinates {
    startCoord: number;
    peakCoord: number;
    endCoord: number;
}
/**
 * Item variation data subtable
 */
export interface ItemVariationData {
    itemCount: uint16;
    regionIndexes: uint16[];
    deltaSets: number[][];
}
/**
 * Delta set index map for mapping glyphs to variation data
 */
export interface DeltaSetIndexMap {
    format: number;
    mapCount: uint32;
    entryFormat: number;
    innerIndexBitCount: number;
    mapData: {
        outer: number;
        inner: number;
    }[];
}
/**
 * Parse HVAR table
 */
export declare function parseHvar(reader: Reader): HvarTable;
/**
 * Calculate scalar for a variation region given axis coordinates
 */
export declare function calculateRegionScalar(region: VariationRegion, coords: number[]): number;
/**
 * Get advance width delta for a glyph at given variation coordinates
 */
export declare function getAdvanceWidthDelta(hvar: HvarTable, glyphId: GlyphId, coords: number[]): number;
/**
 * Get left side bearing delta for a glyph at given variation coordinates
 */
export declare function getLsbDelta(hvar: HvarTable, glyphId: GlyphId, coords: number[]): number;
/**
 * Get right side bearing delta for a glyph at given variation coordinates
 */
export declare function getRsbDelta(hvar: HvarTable, glyphId: GlyphId, coords: number[]): number;