private bool JudgeTransparentPic(TextureFormat format)
    {
        //所有貼圖格式帶alpha通道的格式，帶alpha通道的貼圖才為透明貼圖
        string[] transparentFormat = 
        {
            TextureFormat.Alpha8.ToString(),TextureFormat.ARGB32.ToString(),
            TextureFormat.ARGB4444.ToString(),TextureFormat.ATC_RGBA8.ToString(),
            TextureFormat.ATF_RGBA_JPG.ToString(),TextureFormat.BGRA32.ToString(),
            TextureFormat.PVRTC_RGBA2.ToString(),TextureFormat.PVRTC_RGBA4.ToString(),
            TextureFormat.RGBA32.ToString(),TextureFormat.RGBA4444.ToString(),
        };
        string selfFormat = format.ToString();
        for (int i = 0; i < transparentFormat.Length; i++)
        {
            if (selfFormat == transparentFormat[i])
            {
                return true;
            }
        }
        return false;
    }