/** Rectangle describing an APNG frame region. */
export interface ImageFrameRect {
    x: number;
    y: number;
    width: number;
    height: number;
}
/** One APNG frame (decoded pixel data is optional until decompress). */
export interface ImageFrame {
    rect: ImageFrameRect;
    delay: number;
    dispose: number;
    blend: number;
    data?: Uint8Array;
}
export interface ImageTabACTL {
    num_frames: number;
    num_plays: number;
}
export interface ImageTabText {
    [key: string]: string;
}
export interface ImageTabs {
    acTL?: ImageTabACTL;
    pHYs?: number[];
    cHRM?: number[];
    tEXt?: ImageTabText;
    zTXt?: ImageTabText;
    iTXt?: ImageTabText;
    PLTE?: number[];
    hIST?: number[];
    /** Indexed: alpha bytes; grayscale: single sample; RGB: [r,g,b] samples. */
    tRNS?: number | number[];
    gAMA?: number;
    sRGB?: number;
    bKGD?: number | number[];
    CgBI?: Uint8Array;
    /** Animation loop count for encode: 0 = forever, 1 = play once, … */
    loop?: number;
}
/** Decoded PNG / APNG image. `data` is raw unfiltered samples (not RGBA). */
export interface Image {
    width: number;
    height: number;
    depth: number;
    ctype: number;
    frames: ImageFrame[];
    tabs: ImageTabs;
    data: Uint8Array;
}
/** Internal IHDR fields kept only while decompressing. */
export interface DecodeState extends Image {
    compress: number;
    filter: number;
    interlace: number;
}
/** Palette entry produced by `quantize`; `est.rgba` is the packed color. */
export interface QuantizeLeaf {
    est: {
        rgba: number;
    };
}
export interface QuantizeResult {
    abuf: ArrayBuffer;
    inds: Uint8Array;
    plte: QuantizeLeaf[];
}
/** Compressed frame ready for IDAT / fdAT. */
export interface EncodeFrame {
    rect: ImageFrameRect;
    img: Uint8Array;
    blend: number;
    dispose: number;
    bpp: number;
    bpl: number;
    cimg?: Uint8Array;
}
export interface EncodeImage {
    ctype: number;
    depth: number;
    frames: EncodeFrame[];
    plte?: number[];
}
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