import type { MatchOptions, RawImage } from './types.js';
import { AsciiFrame } from './frame.js';
/** Source descriptor from 64 polarity-adjusted lumas (ALGORITHM.md §18). */
export declare function computeShape6(pl: ArrayLike<number>, out: Int32Array): void;
/** 3-bit quantization → 18-bit LUT index (ALGORITHM.md §18). */
export declare function quantizeShape6(v: ArrayLike<number>): number;
/** Dequantized bucket-center vector for LUT construction. */
export declare function shape6BucketCenter(index: number, out: Float64Array): void;
export declare function matchFrameShape6(source: RawImage, options: MatchOptions): AsciiFrame;
export declare function matchFrameRamp(source: RawImage, options: MatchOptions): AsciiFrame;