/** @format */
import { Decoder, DecoderDecodeOptions } from './decoder.js';
import { IcoInfo } from './ico/ico-info.js';
import { MemoryImage } from '../image/image.js';
import { ImageFormat } from './image-format.js';
/**
 * Class representing an ICO decoder.
 */
export declare class IcoDecoder implements Decoder {
    /**
     * Input buffer for the ICO file.
     */
    private _input?;
    /**
     * Information about the ICO file.
     */
    private _info?;
    /**
     * Gets the image format.
     * @returns {ImageFormat} The image format.
     */
    get format(): ImageFormat;
    /**
     * Gets the number of frames in the ICO file.
     * @returns {number} The number of frames.
     */
    get numFrames(): number;
    /**
     * Checks if the provided bytes represent a valid ICO file.
     * @param {Uint8Array} bytes - The bytes to check.
     * @returns {boolean} True if the bytes represent a valid ICO file, false otherwise.
     */
    isValidFile(bytes: Uint8Array): boolean;
    /**
     * Starts decoding the ICO file.
     * @param {Uint8Array} bytes - The bytes of the ICO file.
     * @returns {IcoInfo | undefined} The information about the ICO file, or undefined if invalid.
     */
    startDecode(bytes: Uint8Array): IcoInfo | undefined;
    /**
     * Decodes the ICO file into a MemoryImage.
     * @param {DecoderDecodeOptions} opt - The decode options.
     * @param {Uint8Array} opt.bytes - The bytes of the ICO file.
     * @param {number} [opt.frameIndex] - The index of the frame to decode.
     * @returns {MemoryImage | undefined} The decoded MemoryImage, or undefined if decoding failed.
     */
    decode(opt: DecoderDecodeOptions): MemoryImage | undefined;
    /**
     * Decodes a specific frame of the ICO file.
     * @param {number} frameIndex - The index of the frame to decode.
     * @returns {MemoryImage | undefined} The decoded MemoryImage, or undefined if decoding failed.
     */
    decodeFrame(frameIndex: number): MemoryImage | undefined;
    /**
     * Decodes the largest frame in the ICO file.
     * @param {Uint8Array} bytes - The bytes of the ICO file.
     * @returns {MemoryImage | undefined} The decoded MemoryImage, or undefined if decoding failed.
     */
    decodeImageLargest(bytes: Uint8Array): MemoryImage | undefined;
}