/// <reference types="node" />
export interface PNGProcessor {
    /**
     * Crop a screenshot to the specified dimensions.
     *
     * Will throw {@link OutOfBoundsError} if trying to crop outside of the image.
     *
     * @param img PNG encoded buffer.
     * @param x Top left coordinate in pixels.
     * @param y Top left coordinate in pixels.
     * @param w Width in pixels.
     * @param h Height in pixels.
     */
    crop: (img: Buffer, x: number, y: number, w: number, h: number) => Promise<Buffer>;
    /**
     * Draw a colored rectangle over the screenshot.
     *
     * @param img PNG encoded buffer.
     * @param x Top left coordinate in pixels.
     * @param y Top left coordinate in pixels.
     * @param w Width in pixels.
     * @param h Height in pixels.
     * @param c Hex color e.g. `#ff00ff`.
     */
    paint: (img: Buffer, x: number, y: number, w: number, h: number, c: string) => Promise<Buffer>;
}
export declare class OutOfBoundsError extends Error {
    constructor(x1: number, y1: number, w1: number, h1: number, w2: number, h2: number);
}