unity 截图压缩处理

/****************************************************
*
* unity屏幕截图，并转换成Base64码
* 作者: lyb
* 日期：2017年7月25日
*
*****************************************************/

using System;
using System.IO;
using UnityEngine;
using System.Collections;

public class Tools_TexScreenshot : MonoBehaviour
{
public delegate void WeChatTexScreenShotDelegate(bool isSucc);
public WeChatTexScreenShotDelegate WeChatTexScreenShotCallBack;

private static Tools_TexScreenshot _Instance;
public static Tools_TexScreenshot Instance
{
get { return _Instance; }
}

void Awake()
{
_Instance = this;
}

void OnDestroy()
{
_Instance = null;

Texture_ShotDelete();
}

/// <summary>
/// 截图图片保存路径
/// </summary>
private string texShotPath
{
get
{
return projectQ.PathHelper.PersistentPath + "/screencapture.jpg";
}
}
/// <summary>
/// 压缩后的截图图片保存路径
/// </summary>
private string texZipShotPath
{
get
{
return projectQ.PathHelper.PersistentPath + "/texShare.jpg";
}
}

public byte[] GetCaptureTexture(Texture2D _tex2d)
{
_tex2d.Compress(false);
Texture2D texZip = Tools_TexGzip.TexGzipBegin(_tex2d, 0.5f);
return texZip.EncodeToJPG();
}

/// <summary>
/// 屏幕截图保存
/// </summary>
/// <param name="startPoint">截图起点坐标</param>
/// <param name="shotSize">截图大小</param>
public void Texture_Screenshot(Vector2 startPoint, Vector2 shotSize, WeChatTexScreenShotDelegate shotBack)
{
StartCoroutine(GetCapture(startPoint, shotSize, shotBack));
}

IEnumerator GetCapture(Vector2 startPoint, Vector2 shotSize, WeChatTexScreenShotDelegate shotBack)
{
// 截屏之前，删除截屏缓存文件
Texture_ShotDelete();

yield return new WaitForEndOfFrame();

int width = (int)shotSize.x;

int height = (int)shotSize.y;

Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

tex.ReadPixels(new Rect(startPoint.x, startPoint.y, width, height), 0, 0, true);

//对屏幕缓存进行压缩
tex.Compress(false);

//对图片进行压缩
Texture2D texZip = Tools_TexGzip.TexGzipBegin(tex, 0.5f);

//转化为jpg图
byte[] imagebytes = texZip.EncodeToJPG();

//存储png图
File.WriteAllBytes(texShotPath, imagebytes);

yield return null;

if (shotBack != null)
{
shotBack(true);
}
}

/// <summary>
/// 图片压缩
/// </summary>
void Texture_Gzip(int height, int width, WeChatTexScreenShotDelegate shotBack)
{
if (shotBack != null)
{
shotBack(true);
}
}

/// <summary>
/// 将图片数据转换为Base64字符串
/// </summary>
public string Texture_ToBase64()
{
if (!System.IO.File.Exists(texShotPath))
{
Debug.Log(" 图片路径无效： " + texShotPath);
return null;
}

var base64Img = Convert.ToBase64String(System.IO.File.ReadAllBytes(texShotPath));

Debug.Log(" #[图片转换成Base64]# 成功图片信息" + base64Img);

// 分享完成，图片删除
Texture_ShotDelete();

return base64Img.ToString();
}

/// <summary>
/// 将指定路径图片转换为Base64字符串
/// </summary>
public string Texture_FixedToBase64(string texFixedPath)
{
var base64Img = Convert.ToBase64String(System.IO.File.ReadAllBytes(texFixedPath));

return base64Img.ToString();
}

/// <summary>
/// 将本地图片转换为Base64字符串
/// </summary>
public string Texture_LocalToBase64(byte[] _bytes)
{
var base64Img = Convert.ToBase64String(_bytes);

return base64Img.ToString();
}

/// <summary>
/// 将保存下来的用于分享的图片删除掉
/// </summary>
public void Texture_ShotDelete()
{
if (File.Exists(texShotPath))
{
Debug.Log(" #[如果截图的图片还在则删掉]# ");

File.Delete(texShotPath);
}

if (File.Exists(texZipShotPath))
{
Debug.Log(" #[图片转换成Base64成功后删除]# ");

File.Delete(texZipShotPath);
}
}
}

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