export declare function getMaskingViewSize(): {
    maxWidth: number;
    maxHeight: number;
};
/**
 * 绘制蒙层
 * @param context 需要进行绘制canvas
 * @param imgData 屏幕截图canvas容器
 */
export declare function drawMasking(context: CanvasRenderingContext2D, imgData?: HTMLCanvasElement): void;