一些针对wpf的升级

[yangjieshao]

1. 增加是否连接摄像头成功判断的函数
2. 增加获取帧画面byte[]的函数(camera.GetBitmapBuffer) 用于更快的更新wpf的WriteableBitmap
3. 根据needOldData配置获取过的帧画面下次获取是否返回(可用于判断是否断开连接)
4. camera.GetBitmap 改为 可能返回 <null>

[yangjieshao]

PropertyChanged.Fody.nupkg WriteableBitmapHelper.cs ScreenBrushViewModel.cs can use like this

<Border
       Width="256"
       Height="256"
       Background="{Binding ScreenBrush.Brush}"
       CornerRadius="128" />

 private void OpenUsbCamera()
        {
            var deviceInfos = UsbCamera.FindDeviceInfos();
            if (deviceInfos.Count > 0)
            {
                ViewModel.ScreenBrush.CameraInfo =new CameraInfoViewModel
                {
                    Name = deviceInfos[0].Name,
                    Id = deviceInfos[0].DevicePath,
                    CameraIndex = 0
                };
            }
        }

[yangjieshao]

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