import type { PixelPlane } from './pixels';
/**
 * Direction search over an 8x8 block. Returns the best direction (0..7) and
 * writes the variance into `varOut[0]`.
 */
export declare function cdefFindDir(img: PixelPlane, off: number, stride: number, varOut: Int32Array, bitDepth?: number): number;
/**
 * CDEF filter one w×h block in place. `left` holds the 2 pre-filter samples to
 * the left of each row; `top`/`bottom` point at the pre-filter neighbor rows.
 */
export declare function cdefFilterBlock(dst: PixelPlane, dstOff: number, dstStride: number, left: Int32Array, top: PixelPlane, topOff: number, bottom: PixelPlane, botOff: number, priStrength: number, secStrength: number, dir: number, damping: number, w: number, h: number, edges: number, src?: PixelPlane, srcOff?: number, srcStride?: number, bitDepth?: number): void;
/**
 * Apply CDEF across the whole frame. Reads pre-CDEF neighbor samples from a
 * copy of each plane and writes filtered pixels back. 64x64-superblock,
 * single-tile, non-superres path.
 */
export declare function applyCdef(buf: CdefPlanes, data: CdefData, opts: {
    enableCdef: boolean
    damping: number
    bits: number
    yPri: number[]
    ySec: number[]
    uvPri: number[]
    uvSec: number[]
    monochrome: boolean
    ssHor: number
    ssVer: number
    layout: number
    bitDepth?: number
  }): void;
export declare const CDEF_HAVE_LEFT: 1;
export declare const CDEF_HAVE_RIGHT: 2;
export declare const CDEF_HAVE_TOP: 4;
export declare const CDEF_HAVE_BOTTOM: 8;
declare interface CdefPlanes {
  y: PixelPlane
  u: PixelPlane
  v: PixelPlane
  yStride: number
  uvStride: number
}
/**
 * Per-frame CDEF metadata recorded during decode: the cdef index per 64x64
 * superblock, and per-4x4 non-skip flags (CDEF only filters 8x8 blocks that
 * carry coded coefficients).
 */
export declare class CdefData {
  idx: Int8Array;
  noskip: Uint8Array;
  readonly sb64w: number;
  readonly miCols: number;
  readonly miRows: number;
  constructor(miCols: number, miRows: number);
}