from __future__ import annotations

import cv2

WINDOW_NAME = "Android Camera (WebRTC)"


def show_frame(image, window_name: str = WINDOW_NAME) -> None:
    """在OpenCV窗口中显示图像帧"""
    cv2.imshow(window_name, image)


def wait_key(delay_ms: int = 1) -> int:
    """等待按键并返回ASCII码"""
    return cv2.waitKey(delay_ms) & 0xFF


def is_esc_pressed() -> bool:
    """检测ESC键是否被按下"""
    return wait_key(1) == 27


def close_window() -> None:
    """关闭所有OpenCV窗口"""
    cv2.destroyAllWindows()