Unity 之 Texture和Texture2D部分使用相关

Unity 之 Texture和Texture2D 分享几个实用的方法，，，

---

Texture转换成Texture2D，，，

    /// 

    /// Texture转换成Texture2D...
    /// 
    /// 
    /// 
    Texture2D TextureToTexture2D(Texture texture)
    {
        Texture2D texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);

        RenderTexture currentRT = RenderTexture.active;
  
        RenderTexture renderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 32);
        Graphics.Blit(texture, renderTexture);

        RenderTexture.active = renderTexture;
        texture2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
        texture2D.Apply();

        RenderTexture.active = currentRT;
        RenderTexture.ReleaseTemporary(renderTexture);

        return texture2D;
    }

---

使用Texture2D 的形式截图，，，

/// 

/// 截图...
/// 
/// 截图的区域
/// 
Texture2D CaptureScreenshot(Rect rect) 
{
	// 先创建一个的空纹理，大小可根据实现需要来设置
	Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24,false);
 
	// 读取屏幕像素信息并存储为纹理数据，
	screenShot.ReadPixels(rect, 0, 0);
	screenShot.Apply();
 
	// 然后将这些纹理数据，成一个png图片文件
	byte[] bytes = screenShot.EncodeToPNG();
	string filename = Application.dataPath + "/Screenshot.png";
	System.IO.File.WriteAllBytes(filename, bytes);
	Debug.Log(string.Format("截屏了一张图片: {0}", filename));
 
	// 最后，我返回这个Texture2d对象，这样我们直接，所这个截图图示在游戏中，当然这个根据自己的需求的。
	return screenShot;
}

---

将Texture保存到本地，，，

    /// 

    /// 将Texture转为本地PNG...
    /// 
    /// 
    /// 
    /// 
    public static bool saveMainTextureToPng(string filePath, Texture teture)
    {
        if (teture.GetType() != typeof(Texture2D))
        {
            return false;
        }
        Texture2D savedTexture = (Texture2D)teture;
        try
        {
            Texture2D newTexture = new Texture2D(savedTexture.width, savedTexture.height, TextureFormat.RGBA32, false);
            newTexture.SetPixels(0, 0, savedTexture.width, savedTexture.height, savedTexture.GetPixels());
            newTexture.Apply();
            byte[] bytes = newTexture.EncodeToPNG();
            if (bytes != null && bytes.Length > 0)
            {
                if (File.Exists(filePath))
                {
                    File.Delete(filePath);
                }
                System.IO.File.WriteAllBytes(filePath, bytes);                
            }
        }
        catch (IOException ex)
        {
            return false;
        }

        return true;
    }

---

将本地图片转换为Byte[]数组，，，

    /// 

    /// 将图片转换为byte数组...
    /// 
    /// 图片路径
    /// 
    public static byte[] ReadTexture(string filePath)
    {
        FileStream fileStream = new FileStream(filePath, FileMode.Open, System.IO.FileAccess.Read);
        fileStream.Seek(0, SeekOrigin.Begin);
		//创建byte数组 ...  
        byte[] buffer = new byte[fileStream.Length];  
        fileStream.Read(buffer, 0, (int)fileStream.Length);

        fileStream.Close();
        fileStream.Dispose();
        fileStream = null;
        
        return buffer;
    }