import type { Fixed, Tag } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * Font Variations table (fvar)
 * Defines axes of variation in a variable font
 */
export interface FvarTable {
    majorVersion: number;
    minorVersion: number;
    axes: VariationAxis[];
    instances: NamedInstance[];
}
/**
 * Variation axis definition
 */
export interface VariationAxis {
    /** 4-byte axis tag (e.g., 'wght', 'wdth', 'ital') */
    tag: Tag;
    /** Minimum coordinate value */
    minValue: Fixed;
    /** Default coordinate value */
    defaultValue: Fixed;
    /** Maximum coordinate value */
    maxValue: Fixed;
    /** Axis qualifiers (flags) */
    flags: number;
    /** Name ID for this axis */
    axisNameId: number;
}
/**
 * Named instance (predefined variation)
 */
export interface NamedInstance {
    /** Name ID for this instance */
    subfamilyNameId: number;
    /** Flags */
    flags: number;
    /** Coordinate values for each axis */
    coordinates: Fixed[];
    /** PostScript name ID (optional) */
    postScriptNameId?: number;
}
/**
 * Common axis tags
 */
export declare const AxisTags: {
    /** Weight (100-900, default 400) */
    readonly wght: 2003265652;
    /** Width (50-200%, default 100) */
    readonly wdth: 2003072104;
    /** Italic (0-1) */
    readonly ital: 1769234796;
    /** Slant (-90 to 90 degrees) */
    readonly slnt: 1936486004;
    /** Optical size (in points) */
    readonly opsz: 1869640570;
};
/**
 * Parse fvar table - font variations defining axes and named instances
 * @param reader - Reader positioned at start of fvar table
 * @returns Parsed fvar table with variation axes and instances
 */
export declare function parseFvar(reader: Reader): FvarTable;
/**
 * Normalize axis value to range [-1, 1]
 */
export declare function normalizeAxisValue(axis: VariationAxis, value: number): number;
/**
 * Get axis by tag
 */
export declare function getAxis(fvar: FvarTable, axisTag: Tag): VariationAxis | null;
/**
 * Get axis index by tag
 */
export declare function getAxisIndex(fvar: FvarTable, axisTag: Tag): number;
/**
 * Debug: Print axis info
 */
export declare function formatAxis(axis: VariationAxis): string;