import { IImageData } from './types.ts';
/**
 * Icon object.
 */
export declare abstract class Icon {
    /**
     * Icon constructor.
     */
    constructor();
    /**
     * Decode PNG data to RGBA image.
     *
     * @param data PNG data.
     * @returns Image data.
     */
    protected _decodePngToRgba(data: Readonly<Uint8Array>): Promise<IImageData>;
    /**
     * Encode RGBA image to PNG data.
     *
     * @param imageData Image data.
     * @param srgb SRGB mode.
     * @returns PNG data.
     */
    protected _encodeRgbaToPng(imageData: Readonly<IImageData>, srgb?: number | null): Promise<Uint8Array>;
    /**
     * Encode icon.
     *
     * @returns Encoded icon.
     */
    abstract encode(): Uint8Array;
}