export type SDFCanvas = HTMLCanvasElement | OffscreenCanvas;
export type SDFViewBox = readonly [
    minX: number,
    minY: number,
    maxX: number,
    maxY: number
];
export type SDFChannel = 0 | 1 | 2 | 3;
export interface SDFGenerationResult {
    readonly timing: number;
}
export type WarmableSDFCanvas = SDFCanvas & {
    _warm?: boolean;
};
/**
 * Generate an SDF texture image for a single glyph path, placing the result into a webgl canvas at a
 * given location and channel. Utilizes the webgl-sdf-generator external package for GPU-accelerated SDF
 * generation when supported.
 */
export declare function generateSDF(width: number, height: number, path: string, viewBox: SDFViewBox, distance: number, exponent: number, canvas: SDFCanvas, x: number, y: number, channel: SDFChannel, useWebGL?: boolean): Promise<SDFGenerationResult>;
export declare function warmUpSDFCanvas(canvas: WarmableSDFCanvas): void;
export declare const resizeWebGLCanvasWithoutClearing: (canvas: SDFCanvas, newWidth: number, newHeight: number) => void;