/** @format */
import { InputBuffer } from '../common/input-buffer.js';
import { MemoryImage } from '../image/image.js';
import { BmpInfo } from './bmp/bmp-info.js';
import { Decoder, DecoderDecodeOptions } from './decoder.js';
import { ImageFormat } from './image-format.js';
/**
 * Class representing a BMP decoder.
 */
export declare class BmpDecoder implements Decoder {
    /**
     * Input buffer for the BMP data.
     */
    protected _input?: InputBuffer<Uint8Array>;
    /**
     * Information about the BMP file.
     */
    protected _info?: BmpInfo;
    /**
     * Flag to force RGBA format.
     */
    protected _forceRgba: boolean;
    /**
     * Get the image format.
     * @returns {ImageFormat} The image format.
     */
    get format(): ImageFormat;
    /**
     * Get the number of frames in the BMP image.
     * @returns {number} The number of frames.
     */
    get numFrames(): number;
    /**
     * Create a BMP decoder.
     * @param {boolean} [forceRgba=false] - Flag to force RGBA format.
     */
    constructor(forceRgba?: boolean);
    /**
     * Check if the given file is a valid BMP image.
     * @param {Uint8Array} bytes - The file bytes.
     * @returns {boolean} True if the file is a valid BMP image, false otherwise.
     */
    isValidFile(bytes: Uint8Array): boolean;
    /**
     * Start decoding the BMP file.
     * @param {Uint8Array} bytes - The file bytes.
     * @returns {BmpInfo | undefined} The BMP information or undefined if invalid.
     */
    startDecode(bytes: Uint8Array): BmpInfo | undefined;
    /**
     * Decode a single frame from the BMP file.
     * @param {number} _frameIndex - The index of the frame to decode.
     * @returns {MemoryImage | undefined} The decoded image or undefined if there was an error.
     */
    decodeFrame(_frameIndex: number): MemoryImage | undefined;
    /**
     * Decode the BMP file and extract a single image from it.
     * If the file is animated, the specified frameIndex will be decoded.
     * @param {DecoderDecodeOptions} opt - The decode options.
     * @param {Uint8Array} opt.bytes - The file bytes.
     * @param {number} [opt.frameIndex=0] - The index of the frame to decode.
     * @returns {MemoryImage | undefined} The decoded image or undefined if there was an error.
     */
    decode(opt: DecoderDecodeOptions): MemoryImage | undefined;
}