import type { Detail, FaceLayer, Pose } from './model.js';
import { type Gaze } from './gaze.js';
export type Point = {
    x: number;
    y: number;
};
/** Stable winding, anchor and perimeter correspondence; never align against a live blend. */
export declare function contour(points: Point[]): Point[];
export declare const traitWeight: (layers: FaceLayer[], predicate: (pose: FaceLayer['traits']) => boolean) => number;
export declare function blendContours(contours: Point[][], layers: FaceLayer[]): Point[];
export declare function isLineEye(pose: Pick<Pose, 'eye' | 'mouth'>, side: number, detail: Detail): boolean;
export declare function eyeContour(pose: Pose, r: number, side: number, blink: number, detail: Detail): Point[];
export declare function mouthGeometry(pose: Pose): {
    outline: Point[];
    opening: Point[];
    width: number;
    height: number;
};
export declare function drawMorphEye(ctx: CanvasRenderingContext2D, pose: Pose, layers: FaceLayer[], r: number, side: number, blink: number, detail: Detail, ink: string, iris: boolean, gaze: Gaze): void;
/** Find the lower contour at the drool's right-side attachment point. Using
 * the rendered outline keeps it attached throughout mouth-shape morphs. */
export declare function droolAnchor(outline: Point[], width: number): Point;
export declare function drawDrool(ctx: CanvasRenderingContext2D, anchor: Point, amount?: number): void;
export declare function drawMorphMouth(ctx: CanvasRenderingContext2D, pose: Pose, layers: FaceLayer[], ink: string): void;
export declare function drawMorphBrow(ctx: CanvasRenderingContext2D, layers: FaceLayer[], r: number, side: number, ink: string, stroke?: number, length?: number): void;
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