/**
 * Holds font metadata including names character range width table and style flags.
 *
 * @private
 */
export declare class _PdfFontMetrics {
    /**
     * Specifies the human readable font name.
     *
     * @private
     */
    _name: string;
    /**
     * Stores the PostScript name used to identify the font program.
     *
     * @private
     */
    _postScriptName: string;
    /**
     * Code of the first supported character.
     *
     * @private
     */
    _firstChar: number;
    /**
     * Code of the last supported character.
     *
     * @private
     */
    _lastChar: number;
    /**
     * Scaling factor applied to compute subscript size.
     *
     * @private
     */
    _subScriptSizeFactor: number;
    /**
     * Scaling factor applied to compute superscript size.
     *
     * @private
     */
    _superscriptSizeFactor: number;
    /**
     * Width table used to resolve glyph advance widths.
     *
     * @private
     */
    _widthTable: _WidthTable;
    /**
     * Indicates whether this font uses Unicode encoding.
     *
     * @private
     */
    _isUnicodeFont: boolean;
    /**
     * Indicates whether the font is bold.
     *
     * @private
     */
    _isBold: boolean;
}
/**
 * Base type for width lookup tables that provide character width access and serialization.
 *
 * @private
 */
export declare abstract class _WidthTable {
    /**
     * Returns the width for the requested character code.
     *
     * @private
     * @param {number} index Character code (0 based or code point based on table).
     * @returns {number} width.
     */
    abstract _itemAt(index: number): number;
    /**
     * Returns the flattened width data for serialization.
     *
     * @private
     * @returns {number[]} array.
     */
    abstract _toArray(): number[];
}
/**
 * Stores per character widths with direct indexed access.
 *
 * @private
 */
export declare class _StandardWidthTable extends _WidthTable {
    widths: number[];
    constructor(widths: number[]);
    /**
     * Returns the width for the requested character code with bounds validation.
     *
     * @private
     * @param {number} index Character code index.
     * @returns {number} width.
     */
    _itemAt(index: number): number;
    /**
     * Returns the underlying widths array without transformation.
     *
     * @private
     * @returns {number[]} widths.
     */
    _toArray(): number[];
}
/**
 * Manages CJK width ranges with a default width and range overrides.
 *
 * @private
 */
export declare class _CjkWidthTable extends _WidthTable {
    widths: _CjkWidth[];
    /**
     * Default glyph width used when no specific width is defined.
     *
     * @private
     */
    _defaultWidth: number;
    constructor(defaultWidth: number);
    /**
     * Returns the width for the requested code using default and matching range entries.
     *
     * @private
     * @param {number} index Character code.
     * @returns {number} width.
     */
    _itemAt(index: number): number;
    /**
     * Produces a compact array representation of all range width data.
     *
     * @private
     * @returns {number[]} array.
     */
    _toArray(): number[];
    /**
     * Adds a CJK width range entry to the table.
     *
     * @private
     * @param {_CjkWidth} width Range entry.
     * @returns {void} nothing.
     */
    _add(width: _CjkWidth): void;
}
/**
 * Represents a CJK width range entry that exposes bounds and width accessors.
 *
 * @private
 */
export declare abstract class _CjkWidth {
    /**
     * Gets the starting code of the range.
     *
     * @private
     * @returns {number} from.
     */
    abstract readonly _from: number;
    /**
     * Gets the ending code of the range.
     *
     * @private
     * @returns {number} to.
     */
    abstract readonly _to: number;
    /**
     * Returns the width for a code within the range.
     *
     * @private
     * @param {number} index Character code.
     * @returns {number} width.
     */
    abstract _itemAt(index: number): number;
    /**
     * Appends the encoded range information to the output array.
     *
     * @private
     * @param {number[]} array Output array.
     * @returns {void} nothing.
     */
    abstract _appendToArray(array: number[]): void;
}
/**
 * Describes a CJK range where all codes share the same width.
 *
 * @private
 */
export declare class _CjkSameWidth extends _CjkWidth {
    /**
     * Starting character code for which the width applies.
     *
     * @private
     */
    _widthFrom: number;
    /**
     * Ending character code for which the width applies.
     *
     * @private
     */
    _widthTo: number;
    /**
     * Width value applied to all codes in the specified range.
     *
     * @private
     */
    _width: number;
    constructor(from: number, to: number, width: number);
    /**
     * Gets the starting code of the uniform width range.
     *
     * @private
     * @returns {number} from.
     */
    readonly _from: number;
    /**
     * Gets the ending code of the uniform width range.
     *
     * @private
     * @returns {number} to.
     */
    readonly _to: number;
    /**
     * Returns the uniform width for any code within the range.
     *
     * @private
     * @param {number} index Character code.
     * @returns {number} width.
     */
    _itemAt(index: number): number;
    /**
     * Appends the range using start end and width triplet.
     *
     * @private
     * @param {number[]} array Output array.
     * @returns {void} nothing.
     */
    _appendToArray(array: number[]): void;
}
/**
 * Describes a CJK range where codes have varying widths.
 *
 * @private
 */
export declare class _CjkDifferentWidth extends _CjkWidth {
    /**
     * Starting character code for the widths array.
     *
     * @private
     */
    _widthFrom: number;
    /**
     * List of widths corresponding to consecutive character codes.
     *
     * @private
     */
    _widths: number[];
    constructor(from: number, widths: number[]);
    /**
     * Gets the starting code of the varying width range.
     *
     * @private
     * @returns {number} from.
     */
    readonly _from: number;
    /**
     * Gets the ending code of the varying width range.
     *
     * @private
     * @returns {number} to.
     */
    readonly _to: number;
    /**
     * Returns the width for a code within the varying range.
     *
     * @private
     * @param {number} index Character code.
     * @returns {number} width.
     */
    _itemAt(index: number): number;
    /**
     * Appends the starting code followed by the widths for the range.
     *
     * @private
     * @param {number[]} array Output array.
     * @returns {void} nothing.
     */
    _appendToArray(array: number[]): void;
}