import type { Space } from './core/convert.js';
/** A gamut-boundary curve to stroke over the plane. */
export interface BoundarySpec {
    points: {
        x: number;
        y: number;
    }[];
    color: string;
    lineWidth: number;
    dash: number[];
}
/** Sample an evenly-spaced [0,1]-indexed curve at `t`, linearly interpolated. */
export declare function sampleCurve(curve: Float64Array, t: number): number;
export interface AreaRequest {
    hue: number;
    cssW: number;
    cssH: number;
    dpr: number;
    supportsP3: boolean;
    /** Gamut stretched to fill the canvas width. The plugin passes 'srgb' (the
     *  sRGB-bound modes) or 'p3' (every wide mode); the primitive also accepts
     *  wider. Every narrower gamut is drawn as an inner boundary line. */
    stretch: Space;
}
export interface AreaResult {
    pixels: Uint8ClampedArray;
    W: number;
    H: number;
    backingW: number;
    backingH: number;
    /** Per-lightness max-chroma curve for the stretch gamut, for thumb placement. */
    chromaCurve: Float64Array;
    boundaries: BoundarySpec[];
}
/** Compute the plane: subsampled gradient pixels + full-res boundary lines. */
export declare function computeArea(req: AreaRequest): AreaResult;