import * as THREE from 'three/webgpu';
export type FontCanvas = HTMLCanvasElement | OffscreenCanvas;
export type FontCanvasRenderingContext = CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D;
export interface FontGlyphMetrics {
    char: string;
    data: Uint8ClampedArray;
    width: number;
    height: number;
    glyphWidth: number;
    glyphHeight: number;
    glyphTop: number;
    glyphLeft: number;
    glyphAdvance: number;
}
export interface FontAtlasGlyph extends FontGlyphMetrics {
    atlasX: number;
    atlasY: number;
}
export interface FontLayoutGlyph extends FontAtlasGlyph {
    left: number;
    top: number;
    boxTop: number;
    boxHeight: number;
}
export interface FontLayoutInfo {
    glyphs: FontLayoutGlyph[];
    width: number;
    height: number;
}
export type FontGlyphCache = Map<string, FontAtlasGlyph>;
/**
 * Manages text layout and an SDF font atlas for vectorized rendering based on Valve's '07 SIGGRAPH paper.
 * @see https://steamcdn-a.akamaihd.net/apps/valve/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf
 */
export declare class FontManager {
    fontFamily: string;
    fontWeight: string;
    fontStyle: string;
    fontSize: number;
    width: number;
    height: number;
    glyphs: FontGlyphCache;
    texture: THREE.DataTexture;
    version: number;
    canvas: FontCanvas | null;
    ctx: FontCanvasRenderingContext | null | undefined;
    _alphabet: string | undefined;
    lineHeight: number | undefined;
    maxAscent: number | undefined;
    margin: number | undefined;
    glyphSize: number | undefined;
    needsUpdate: boolean | undefined;
    _gridOuter: Float64Array | undefined;
    _gridInner: Float64Array | undefined;
    _f: Float64Array | undefined;
    _z: Float64Array | undefined;
    _v: Uint16Array | undefined;
    constructor();
    getGlyphInfo(char: string): FontGlyphMetrics | null;
    initCanvas(): void;
    update(chars: string): void;
    getLayoutInfo(text?: string): FontLayoutInfo;
}