import { ImageDataLike, WasmSource } from "./common.js";
export declare enum Subsampling {
    YUV444 = 1,
    YUV422 = 2,
    YUV420 = 3,
    YUV400 = 4
}
export declare enum AVIFTune {
    Auto = 0,
    PSNR = 1,
    SSIM = 2
}
export interface Options {
    /**
     * [0 - 100], 0 = worst quality, 100 = lossless
     *
     * @default 50
     */
    quality?: number;
    /**
     * As above, but -1 means 'use quality'
     *
     * @default -1
     */
    qualityAlpha?: number;
    /**
     * Range: [-1, 10], 0 = slowest, 10 = fastest, slower should make for a better quality image in less bytes.
     * A combination of settings are tweaked to simulate this speed range.
     *
     * @default 6
     */
    speed?: number;
    /**
     * Chrome subsampling type.
     *
     * @default YUV420
     */
    subsample?: Subsampling;
    /**
     * If true, ignores `tileRowsLog2` and `tileColsLog2` and automatically chooses suitable tiling values.
     *
     * @default false
     */
    autoTiling?: boolean;
    /**
     * [0 - 6], Creates 2^n tiles in that dimension
     *
     * @default 0
     */
    tileRowsLog2?: number;
    tileColsLog2?: number;
    /**
     * Extra chroma compression, cannot be used in lossless mode.
     *
     * @default false
     */
    chromaDeltaQ?: boolean;
    /**
     * Bias towards block sharpness in rate-distortion optimization of transform coefficients [0, 7]
     *
     * @default 0
     */
    sharpness?: number;
    /**
     * Amount of noise (from 0 = don't denoise, to 50)
     *
     * @default 0
     */
    denoiseLevel?: number;
    /**
     * Distortion metric tuned with.
     *
     * @default AVIFTune.Auto
     */
    tune?: AVIFTune;
    /**
     * Use libsharpyuv for RGB->YUV conversion if needed.
     *
     * @default false
     */
    sharpYUV?: boolean;
}
export declare const defaultOptions: Required<Options>;
export declare const mimeType = "image/avif";
export declare const extension = "avif";
export declare const bitDepth: number[];
export declare function loadEncoder(input?: WasmSource): Promise<any>;
export declare function loadDecoder(input?: WasmSource): Promise<any>;
export declare function encode(image: ImageDataLike, options?: Options): Uint8Array;
export declare function decode(input: BufferSource): ImageData;