import type { GlyphId, int16, uint16 } from "../../types.ts";
import { Reader } from "../binary/reader.ts";
/**
 * Glyph Variations table (gvar)
 * Contains variation data for TrueType glyph outlines
 */
export interface GvarTable {
    majorVersion: uint16;
    minorVersion: uint16;
    axisCount: uint16;
    sharedTupleCount: uint16;
    sharedTuples: number[][];
    glyphVariationData: GlyphVariationData[];
}
/**
 * Variation data for a single glyph
 */
export interface GlyphVariationData {
    tupleVariationHeaders: TupleVariationHeader[];
}
/**
 * Tuple variation header
 */
export interface TupleVariationHeader {
    variationDataSize: uint16;
    tupleIndex: uint16;
    peakTuple: number[] | null;
    intermediateStartTuple: number[] | null;
    intermediateEndTuple: number[] | null;
    serializedData: Uint8Array;
    pointNumbers: number[] | null;
    deltas: PointDelta[];
}
/**
 * Delta values for a point
 */
export interface PointDelta {
    x: int16;
    y: int16;
}
/**
 * Parse gvar table - glyph variations for TrueType outlines in variable fonts
 * @param reader - Reader positioned at start of gvar table
 * @param _numGlyphs - Number of glyphs (currently unused)
 * @returns Parsed gvar table with per-glyph variation data
 */
export declare function parseGvar(reader: Reader, _numGlyphs: number, getGlyphPointCount?: (glyphId: GlyphId) => number): GvarTable;
/**
 * Parse packed deltas
 */
export declare function parsePackedDeltas(reader: Reader, count: number): number[];
/**
 * Calculate the scalar for a tuple given axis coordinates
 * Determines how much a variation tuple contributes based on current axis values
 * @param peakTuple - Peak coordinates for each axis where variation is at maximum
 * @param axisCoords - Current normalized axis coordinates
 * @param intermediateStart - Start of intermediate region (null if not used)
 * @param intermediateEnd - End of intermediate region (null if not used)
 * @returns Scalar value between 0 and 1 indicating variation contribution
 */
export declare function calculateTupleScalar(peakTuple: number[], axisCoords: number[], intermediateStart: number[] | null, intermediateEnd: number[] | null): number;
/**
 * Get delta for a glyph point at given variation coordinates
 */
export declare function getGlyphDelta(gvar: GvarTable, glyphId: GlyphId, pointIndex: number, axisCoords: number[]): PointDelta;
export declare function getTupleDeltas(header: TupleVariationHeader, numPoints: number): PointDelta[];