import { IImageData, IPngIhdr } from './types.ts';
/**
 * Hash data with CRC32.
 *
 * @param data Data to be hashed.
 * @returns Data hash.
 */
export declare function crc32(data: Readonly<Uint8Array>): number;
/**
 * Concatenate multiple Uint8Array together.
 *
 * @param arrays Uint8Array arrays.
 * @returns Uint8Array array.
 */
export declare function concatUint8Arrays(arrays: readonly Readonly<Uint8Array>[]): Uint8Array;
/**
 * Decode PNG data to RGBA image.
 *
 * @param data PNG data.
 * @returns Image data.
 */
export declare function decodePngToRgba(data: Readonly<Uint8Array>): Promise<IImageData>;
/**
 * Encode RGBA image to PNG data.
 *
 * @param imageData Image data.
 * @param srgb SRGB mode.
 * @returns PNG data.
 */
export declare function encodeRgbaToPng(imageData: Readonly<IImageData>, srgb?: number | null): Promise<Uint8Array>;
/**
 * Read PNG file tags.
 *
 * @param data PNG data.
 * @yields PNG tags.
 */
export declare function pngReader(data: Readonly<Uint8Array>): Generator<[number, Uint8Array, number], void, unknown>;
/**
 * Encode PNG from tags.
 *
 * @param tags PNG tags and data.
 * @returns PNG data.
 */
export declare function pngEncode(tags: readonly [number, Readonly<Uint8Array>][]): Uint8Array;
/**
 * Repack PNG tag data with a single IDAT.
 *
 * @param data PNG data.
 * @param srgb Set an SRGB value.
 * @returns PNG data.
 */
export declare function pngRepack(data: Readonly<Uint8Array>, srgb?: number | null): Uint8Array;
/**
 * Read PNG IHDR data.
 *
 * @param data PNG data.
 * @returns PNG IHDR.
 */
export declare function pngIhdr(data: Readonly<Uint8Array>): IPngIhdr;
/**
 * Encode data using PackBits ICNS compression.
 *
 * @param data Data to be compressed.
 * @returns Compressed data.
 */
export declare function packBitsIcns(data: Readonly<Uint8Array>): Uint8Array;