如何创建透明Unity window + OS的屏幕截图

using UnityEngine;

public class ScreenshotCapture : MonoBehaviour
{
    private Texture2D screenshotTexture;

    private void Start()
    {
        // 设置窗口为透明
        Application.runInBackground = true;
        Application.targetFrameRate = -1;
        Screen.SetResolution(1, 1, false);
        Screen.fullScreen = false;
        Screen.sleepTimeout = SleepTimeout.NeverSleep;
        Screen.showCursor = false;

        // 创建一个纹理来保存屏幕截图
        screenshotTexture = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
    }

    private void Update()
    {
        // 按下指定的按键来触发屏幕截图
        if (Input.GetKeyDown(KeyCode.S))
        {
            CaptureScreenshot();
        }
    }

    private void CaptureScreenshot()
    {
        // 通过RenderTexture捕捉屏幕截图
        RenderTexture renderTexture = new RenderTexture(Screen.width, Screen.height, 24);
        Camera.main.targetTexture = renderTexture;
        Camera.main.Render();

        // 读取RenderTexture的像素数据并保存到纹理中
        RenderTexture.active = renderTexture;
        screenshotTexture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
        screenshotTexture.Apply();

        // 将纹理保存为PNG文件
        byte[] screenshotBytes = screenshotTexture.EncodeToPNG();
        System.IO.File.WriteAllBytes(Application.dataPath + "/Screenshot.png", screenshotBytes);

        // 重置相机和纹理
        Camera.main.targetTexture = null;
        RenderTexture.active = null;
        Destroy(renderTexture);

        Debug.Log("Screenshot captured!");
    }
}