import type { FWord, int16, uint16 } from "../../types.ts";
import type { Reader } from "../binary/reader.ts";
/**
 * Vertical Header table (vhea)
 * Contains information for vertical layout
 */
export interface VheaTable {
    /** Table version (1.0 or 1.1) */
    version: {
        major: number;
        minor: number;
    };
    /** Typographic ascent (vertical) */
    ascender: FWord;
    /** Typographic descent (vertical) */
    descender: FWord;
    /** Typographic line gap (vertical) */
    lineGap: FWord;
    /** Maximum advance height */
    advanceHeightMax: uint16;
    /** Minimum top side bearing */
    minTopSideBearing: FWord;
    /** Minimum bottom side bearing */
    minBottomSideBearing: FWord;
    /** Maximum y extent (yMax - yMin) */
    yMaxExtent: FWord;
    /** Caret slope rise (for vertical text) */
    caretSlopeRise: int16;
    /** Caret slope run */
    caretSlopeRun: int16;
    /** Caret offset */
    caretOffset: int16;
    /** Metric data format (0 for current) */
    metricDataFormat: int16;
    /** Number of vertical metrics in vmtx */
    numberOfVMetrics: uint16;
}
/**
 * Parse vhea table
 */
export declare function parseVhea(reader: Reader): VheaTable;