import type { int16, uint8, uint16, uint32 } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * OS/2 table - Font metrics and classification
 * Contains Windows-specific metrics and font embedding information
 */
export interface Os2Table {
    version: uint16;
    xAvgCharWidth: int16;
    usWeightClass: uint16;
    usWidthClass: uint16;
    fsType: uint16;
    ySubscriptXSize: int16;
    ySubscriptYSize: int16;
    ySubscriptXOffset: int16;
    ySubscriptYOffset: int16;
    ySuperscriptXSize: int16;
    ySuperscriptYSize: int16;
    ySuperscriptXOffset: int16;
    ySuperscriptYOffset: int16;
    yStrikeoutSize: int16;
    yStrikeoutPosition: int16;
    sFamilyClass: int16;
    panose: uint8[];
    ulUnicodeRange1: uint32;
    ulUnicodeRange2: uint32;
    ulUnicodeRange3: uint32;
    ulUnicodeRange4: uint32;
    achVendID: string;
    fsSelection: uint16;
    usFirstCharIndex: uint16;
    usLastCharIndex: uint16;
    sTypoAscender: int16;
    sTypoDescender: int16;
    sTypoLineGap: int16;
    usWinAscent: uint16;
    usWinDescent: uint16;
    ulCodePageRange1?: uint32;
    ulCodePageRange2?: uint32;
    sxHeight?: int16;
    sCapHeight?: int16;
    usDefaultChar?: uint16;
    usBreakChar?: uint16;
    usMaxContext?: uint16;
    usLowerOpticalPointSize?: uint16;
    usUpperOpticalPointSize?: uint16;
}
/** Weight class constants */
export declare const WeightClass: {
    readonly Thin: 100;
    readonly ExtraLight: 200;
    readonly Light: 300;
    readonly Normal: 400;
    readonly Medium: 500;
    readonly SemiBold: 600;
    readonly Bold: 700;
    readonly ExtraBold: 800;
    readonly Black: 900;
};
/** Width class constants */
export declare const WidthClass: {
    readonly UltraCondensed: 1;
    readonly ExtraCondensed: 2;
    readonly Condensed: 3;
    readonly SemiCondensed: 4;
    readonly Normal: 5;
    readonly SemiExpanded: 6;
    readonly Expanded: 7;
    readonly ExtraExpanded: 8;
    readonly UltraExpanded: 9;
};
/** Font selection flags (fsSelection) */
export declare const FsSelection: {
    readonly Italic: 1;
    readonly Underscore: 2;
    readonly Negative: 4;
    readonly Outlined: 8;
    readonly Strikeout: 16;
    readonly Bold: 32;
    readonly Regular: 64;
    readonly UseTypoMetrics: 128;
    readonly WWS: 256;
    readonly Oblique: 512;
};
/** Font embedding permissions (fsType) */
export declare const FsType: {
    readonly InstallableEmbedding: 0;
    readonly RestrictedLicense: 2;
    readonly PreviewAndPrint: 4;
    readonly Editable: 8;
    readonly NoSubsetting: 256;
    readonly BitmapOnly: 512;
};
/**
 * Parse OS/2 table - Windows-specific metrics, weight, width, and classification
 * @param reader - Reader positioned at start of OS/2 table
 * @returns Parsed OS/2 table
 */
export declare function parseOs2(reader: Reader): Os2Table;
/** Check if font is italic */
export declare function isItalic(os2: Os2Table): boolean;
/** Check if font is bold */
export declare function isBold(os2: Os2Table): boolean;
/** Check if USE_TYPO_METRICS flag is set */
export declare function useTypoMetrics(os2: Os2Table): boolean;
/** Get embedding permission level */
export declare function getEmbeddingPermission(os2: Os2Table): "installable" | "restricted" | "preview" | "editable";