/**
 * 性能监控模块
 * 提供FPS监控和弹幕性能监控功能
 */
type PerformanceWarningCallback = (data: {
    count: number;
    threshold: number;
    message: string;
}) => void;
type FpsDropCallback = (data: {
    fps: number;
    threshold: number;
}) => void;
/**
 * FPS监控类
 */
declare class FpsMonitor {
    private fpsMonitorTimer;
    private lastTime;
    private frames;
    private fps;
    private fpsThreshold;
    private running;
    private onFpsDrop;
    constructor(fpsThreshold?: number, onFpsDrop?: FpsDropCallback);
    /**
     * 开始监控FPS
     */
    start(): void;
    /**
     * 停止监控FPS
     */
    stop(): void;
    /**
     * 获取当前FPS
     */
    getCurrentFps(): number;
    /**
     * 设置FPS下降回调函数
     */
    setFpsDropCallback(callback: FpsDropCallback): void;
    /**
     * 设置FPS阈值
     */
    setFpsThreshold(threshold: number): void;
}
/**
 * 弹幕性能监控器
 */
declare class DanmakuPerformanceMonitor {
    private warningThreshold;
    private onPerformanceWarning;
    constructor(warningThreshold?: number, onPerformanceWarning?: PerformanceWarningCallback);
    /**
     * 检查弹幕数量是否超过阈值
     * @param count 当前弹幕数量
     */
    checkPerformance(count: number): void;
    /**
     * 设置性能警告回调函数
     */
    setWarningCallback(callback: PerformanceWarningCallback): void;
    /**
     * 设置警告阈值
     */
    setWarningThreshold(threshold: number): void;
}
/**
 * 创建FPS监控器
 * @param fpsThreshold FPS阈值，低于此值触发回调
 * @param onFpsDrop FPS下降回调函数
 */
export declare function createFpsMonitor(fpsThreshold?: number, onFpsDrop?: FpsDropCallback): FpsMonitor;
/**
 * 创建弹幕性能监控器
 * @param warningThreshold 弹幕数量警告阈值
 * @param onPerformanceWarning 性能警告回调函数
 */
export declare function createDanmakuPerformanceMonitor(warningThreshold?: number, onPerformanceWarning?: PerformanceWarningCallback): DanmakuPerformanceMonitor;
/**
 * 为vue-danmaku组件创建性能监控
 * 便捷方法，同时创建FPS监控和弹幕性能监控
 * @param options 配置选项
 */
export declare function createDanmakuMonitor(options?: {
    fpsThreshold?: number;
    warningThreshold?: number;
    onFpsDrop?: FpsDropCallback;
    onPerformanceWarning?: PerformanceWarningCallback;
}): {
    fpsMonitor: FpsMonitor;
    performanceMonitor: DanmakuPerformanceMonitor;
    startAll(): void;
    stopAll(): void;
    checkDanmakuCount(count: number): void;
};
export declare const PERFORMANCE_CONSTANTS: {
    DEFAULT_FPS_THRESHOLD: number;
    DEFAULT_WARNING_DANMU_COUNT: number;
};
export type { FpsDropCallback, PerformanceWarningCallback };