import type { GeometricMaskShape, ICreateCanvas, SegmentationInputType, TextShapeMask } from '../interface/wordcloud';
import type { IPointLike } from '@visactor/vutils';
export declare const generateIsEmptyPixel: (backgroundColor?: string, options?: {
    threshold?: number;
    invert?: boolean;
}, createCanvas?: ICreateCanvas) => (imageData: ImageData, y: number, x: number) => boolean;
export declare const generateMaskCanvas: (shape: TextShapeMask | GeometricMaskShape, width: number, height: number, cacheCanvas?: HTMLCanvasElement, invert?: boolean, createCanvas?: ICreateCanvas) => {
    width: number;
    height: number;
    setAttribute: (key: string, val: string) => void;
    getContext: (contextId: string, params?: {
        willReadFrequently?: boolean;
    }) => any;
};
export declare const generatePoints: (center: IPointLike, radius: number, startAngle: number, count: number) => {
    x: number;
    y: number;
}[];
export declare const generateCardioidPoints: (center: IPointLike, radius: number, startAngle: number, count: number) => {
    x: number;
    y: number;
}[];
export declare const drawRegularPolygon: (ctx: CanvasRenderingContext2D, points: IPointLike[]) => void;
export declare const drawCardioid: (ctx: CanvasRenderingContext2D, points: IPointLike[]) => void;
export declare function segmentation(segmentationInput: SegmentationInputType): SegmentationInputType & {
    segmentation: {
        regions: {
            label: number;
            boundary: any;
            area: any;
            center: any;
            maxPoint: any;
            maxR: any;
            ratio: any;
        }[];
        labels: any[];
        labelNumber: number;
    };
    shapeBounds: {
        x1: number;
        x2: number;
        y1: number;
        y2: number;
        width: number;
        height: number;
    };
    shapeMaxR: number;
    shapeRatio: number;
    shapeCenter: number[];
    shapeArea: number;
};
export declare function removeBorder(image: any, canvas: HTMLCanvasElement | any, isEmptyPixel: (imageData: ImageData, i: number, j: number) => boolean): any;
export declare function scaleAndMiddleShape(image: any, size: [number, number]): {
    x: number;
    y: number;
    width: number;
    height: number;
    scale: number;
};