import { AbstractImageAdapter } from "./AbstractImageAdapter";
import type { ImageAdapter } from "./ImageAdapter";
import type { Color } from "../types";
/**
 * Canvas element or offscreen canvas.
 */
export type BrowserCanvas = HTMLCanvasElement | OffscreenCanvas;
/**
 * Browser canvas rendering context 2d.
 */
export type BrowserCanvasContext2d = CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D;
/**
 * ImageAdapter implementation for distortion using HTML5 Canvas objects.
 */
export declare class Canvas extends AbstractImageAdapter<BrowserCanvas> implements ImageAdapter<BrowserCanvas> {
    /**
     * Browser canvas (HTMLCanvasElement or OffscreenCanvas) with image resource.
     */
    protected canvas: BrowserCanvas;
    /**
     * ImageData object to work with.
     */
    protected imageData: ImageData;
    /**
     * ImageData.data array stored for faster access.
     */
    protected data: Uint8ClampedArray;
    /**
     * Canvas constructor.
     *
     * @param canvas HTML5 Canvas or offscreen canvas with image data.
     */
    constructor(canvas: BrowserCanvas);
    /**
     * Creates new instance using CanvasImageSource.
     *
     * @param image
     */
    static createFromImage(image: CanvasImageSource & {
        width: number;
        height: number;
    }): Canvas;
    /**
     * Asynchronously creates Canvas instance from image url.
     *
     * @param url
     */
    static createFromUrl(url: string): Promise<Canvas>;
    /**
     * Asynchronously creates Canvas instance from Blob or File.
     *
     * @param blob
     */
    static createFromBlob(blob: Blob): Promise<Canvas>;
    /**
     * @inheritDoc
     */
    getPixelColor(x: number, y: number): Color;
    /**
     * @inheritDoc
     */
    setPixelColor(x: number, y: number, color: Color): void;
    /**
     * @inheritDoc
     */
    getAverageColor(): Color;
    /**
     * @inheritDoc
     */
    protected resize(width: number, height: number): Canvas;
    /**
     * @inheritDoc
     */
    getResource(): BrowserCanvas;
    /**
     * @inheritDoc
     */
    protected prepareBlank(width: number, height: number): Canvas;
    /**
     * @inheritDoc
     */
    commit(): void;
    /**
     * Returns true if underlying canvas resource is OffscreenCanvas
     */
    isOffscreen(): boolean;
}