unity3d压缩截图

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1、Unity3D压缩截图Unity3D截图用Application.CaptureScreenshot函数，截出来的图超过1mb。如果直接用来分享微信朋友圈会失败的，所以需要压缩截图。压缩截图，如果用C#的System.Drawing，在Android上又报缺少gdiplus.dll库bug，好麻烦。所以用纯代码的压缩类，才什么问题都没有。于是我在网上找到了JPGEncoder.cs纯代码压缩类。最后压出来的图片竟然才130kb。压缩方法步骤如下：一、添加函数1二、在MonoBehaviour类调用2三、将JPGEncoder.cs添加进工程2一

2、、添加函数IEnumeratorCaptureScreenshotJPG(Rectrect){yieldreturnnewWaitForEndOfFrame();//先创建一个的空纹理，大小可根据实现需要来设置TextureFormataTextureFormat;;aTextureFormat=TextureFormat.RGB24;Texture2DscreenShot=newTexture2D((int)(rect.width),(int)(rect.height),aTextureFormat,false);//读取屏幕像素信息并存储为

3、纹理数据，screenShot.ReadPixels(rect,0,0);screenShot.Apply();JPGEncoderencoder=newJPGEncoder(screenShot,20);//质量1~100encoder.doEncoding();while(!encoder.isDone)yieldreturnnull;stringfilename=Application.persistentDataPath+"/"+"screenName.png";System.IO.File.WriteAllBytes(filename

4、,encoder.GetBytes());Debug.Log(string.Format("截屏了一张图片:{0}",filename));}二、在MonoBehaviour类调用调用StartCoroutine(CaptureScreenshotJPG(newRect(0,0,Screen.width,Screen.height)));三、将JPGEncoder.cs添加进工程。可以从http://mcain.bluehoststaff.com/gamedesignftp/backup_Corey/Mega-Fiers/Scripts/Meg

5、aGrab/JPGEncoder.cs拷贝。下面JPGEncoder.cs是我从上面链接拷贝下来，修改过的。建议用下面的JPGEncoder.cs#if!UNITY_FLASHusingUnityEngine;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.IO;//Copyfromhttp://mcain.bluehoststaff.com/gamedesignftp/backup_Corey/Mega-Fiers/Scripts/MegaGrab/JPG

6、Encoder.cspublicclassByteArrayTool{privateMemoryStreamstream;privateBinaryWriterwriter;publicByteArrayTool(){stream=newMemoryStream();writer=newBinaryWriter(stream);}/***FunctionfromAS3--addabytetoourstream*/publicvoidwriteByte(bytevalue){writer.Write(value);}/***Spitbackall

7、bytes--toeitherpassviaWWWorsavetodisk*/publicbyte[]GetAllBytes(){byte[]buffer=newbyte[stream.Length];stream.Position=0;stream.Read(buffer,0,buffer.Length);returnbuffer;}}/***Thisshouldreallybeastruct--ifyoucare,declareitinC#*/classBitString{publicintlen=0;publicintval=0;}/**

8、*Anotherflashclass--emulatingthestufftheencoderuses*/publicclassBitmapData{