Unity自帶Recorder

之所以要講Recorder，是因為Recorder的錄像功能實際上就是把屏幕圖像保存成了一幀幀的圖片，而實現的功能，所以我們先看下它的源碼。

public override void RecordFrame(RecordingSession session){if (m_Inputs.Count != 1)throw new Exception("Unsupported number of sources");Texture2D tex = null;if (m_Inputs[0] is GameViewInput)//游戲視窗輸出的圖像{tex = ((GameViewInput)m_Inputs[0]).image;if (m_Settings.outputFormat == ImageRecorderOutputFormat.EXR){var textx = new Texture2D(tex.width, tex.height, TextureFormat.RGBAFloat, false);textx.SetPixels(tex.GetPixels());tex = textx;}else if (m_Settings.outputFormat == ImageRecorderOutputFormat.PNG){var textx = new Texture2D(tex.width, tex.height, TextureFormat.RGB24, false);textx.SetPixels(tex.GetPixels());//直接復制像素信息tex = textx;}}else{var input = (BaseRenderTextureInput)m_Inputs[0];//普通渲染貼圖var width = input.outputRT.width;var height = input.outputRT.height;tex = new Texture2D(width, height, m_Settings.outputFormat != ImageRecorderOutputFormat.EXR ? TextureFormat.RGBA32 : TextureFormat.RGBAFloat, false);var backupActive = RenderTexture.active;RenderTexture.active = input.outputRT;//將貼圖信息輸入到緩存中tex.ReadPixels(new Rect(0, 0, width, height), 0, 0, false);//讀取緩存的像素tex.Apply();//保存應用RenderTexture.active = backupActive;}byte[] bytes;switch (m_Settings.outputFormat)//輸出格式{case ImageRecorderOutputFormat.PNG:bytes = tex.EncodeToPNG();break;case ImageRecorderOutputFormat.JPEG:bytes = tex.EncodeToJPG();break;case ImageRecorderOutputFormat.EXR:bytes = tex.EncodeToEXR();break;default:throw new ArgumentOutOfRangeException();}if(m_Inputs[0] is BaseRenderTextureInput || m_Settings.outputFormat != ImageRecorderOutputFormat.JPEG)UnityHelpers.Destroy(tex);var path = m_Settings.fileNameGenerator.BuildAbsolutePath(session);File.WriteAllBytes( path, bytes);//保存到本地文件}

仿照進行功能實現

1.創建一個相機，將拍攝的圖片保存到RenderTexture上

2.代碼實現

namespace App.System {/// <summary>/// 相機截圖/// </summary>public class CamUI : MonoBehaviour{public Button takeBtn;public RawImage imgCam;public void Start(){takeBtn.onClick.AddListener(OnTakePicture);}#region 事件private void OnTakePicture(){var dicPath = Application.streamingAssetsPath;string path1 = dicPath + $"/VPImg/picture1.png";SaveTexture(path1, (RenderTexture) imgCam.texture);}private void SaveTexture(string path, RenderTexture renderTexture){var width = renderTexture.width;var height = renderTexture.height;Texture2D tex =new Texture2D(width, height, TextureFormat.ARGB32, false); //創建空白貼圖var backupActive = RenderTexture.active;RenderTexture.active = renderTexture; //將渲染貼圖信息放入緩存tex .ReadPixels(new Rect(0, 0, width, height), 0, 0); //復制緩存信息tex .Apply();RenderTexture.active = backupActive;var bytes = tex .EncodeToPNG();//示例保存成png格式File.WriteAllBytes(path, bytes);}#endregion} }

總結

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