/**
 * Standard Font Metrics — shared between Word layout and PDF rendering.
 *
 * Provides width data for the 14 standard PDF fonts (Helvetica, Times, Courier families).
 * Used for text measurement without requiring actual font files.
 *
 * Character widths are specified in 1/1000 of a text unit. To get the actual width
 * of a character at a given font size:
 *   width_in_points = (charWidth / 1000) * fontSize
 *
 * @see PDF Reference 1.7, Appendix D - Standard Type 1 Fonts
 * @see Adobe Font Metrics files (AFM) for canonical widths
 */
/**
 * Get the width of a character in a given font.
 * @param charCode - Unicode code point (or char code)
 * @param fontName - PDF standard font name
 * @returns Width in thousandths of a unit
 */
export declare function getCharWidth(charCode: number, fontName: string): number;
/**
 * Measure the width of a text string in the given font and size.
 * @param text - The string to measure
 * @param fontName - PDF standard font name
 * @param fontSize - Font size in points
 * @returns Width in points
 */
export declare function measureTextWidth(text: string, fontName: string, fontSize: number): number;
/**
 * Get the font ascent for a given font and size.
 * @param fontName - PDF standard font name
 * @param fontSize - Font size in points
 * @returns Ascent in points (positive, distance above baseline)
 */
export declare function getFontAscent(fontName: string, fontSize: number): number;
/**
 * Get the font descent for a given font and size.
 * @param fontName - PDF standard font name
 * @param fontSize - Font size in points
 * @returns Descent in points (positive value representing distance below baseline)
 */
export declare function getFontDescent(fontName: string, fontSize: number): number;
/**
 * Get the total line height (ascent - descent) for a font.
 * @param fontName - PDF standard font name
 * @param fontSize - Font size in points
 * @returns Line height in points
 */
export declare function getLineHeight(fontName: string, fontSize: number): number;
/**
 * Check if a font name is a known standard PDF font.
 */
export declare function isStandardFont(fontName: string): boolean;
/**
 * Get all supported standard font names.
 */
export declare function getStandardFontNames(): string[];
/**
 * Map common font names (like "Arial", "Calibri") to closest standard font.
 * Returns the input unchanged if it's already a standard font name.
 * Falls back to "Helvetica" for unknown fonts.
 */
export declare function mapToStandardFont(fontName: string): string;
/**
 * Given a standard PDF base font and bold/italic flags, return the matching
 * metric variant name (e.g. "Helvetica" + bold → "Helvetica-Bold"). This keeps
 * width measurement consistent with the glyphs that are actually drawn, so
 * bold/italic runs are measured with their true (wider) metrics rather than
 * the regular ones. Falls back to the base name when a variant is unknown.
 */
export declare function styledFontVariant(baseFont: string, bold?: boolean, italic?: boolean): string;