/// <summary>
/// Initialize and start the camera preview
/// </summary>
public async Task InitializeAsync()
{
Status = "Starting camera...";
// Create a camera preview image source (from Imaging SDK)
_cameraPreviewImageSource = new CameraPreviewImageSource();
await _cameraPreviewImageSource.InitializeAsync(string.Empty);
var properties = await _cameraPreviewImageSource.StartPreviewAsync();
// Create a preview bitmap with the correct aspect ratio
var width = 640.0;
var height = (width / properties.Width) * properties.Height;
var bitmap = new WriteableBitmap((int)width, (int)height);
PreviewBitmap = bitmap;
// Create a filter effect to be used with the source (no filters yet)
_effect = new FilterEffect(_cameraPreviewImageSource);
_writeableBitmapRenderer = new WriteableBitmapRenderer(_effect, _writeableBitmap);
// Attach preview frame delegate
_cameraPreviewImageSource.PreviewFrameAvailable += OnPreviewFrameAvailable;
Status = _filterList[_index].Name;
Initialized = true;
NextFilterCommand.RaiseCanExecuteChanged();
PreviousFilterCommand.RaiseCanExecuteChanged();
}
public MainPageViewModel()
{
NextFilterCommand = new RelayCommand(
() =>
{
if (_index < _filterList.Count - 1)
{
_index++;
_changeFilterRequest = true;
NextFilterCommand.RaiseCanExecuteChanged();
PreviousFilterCommand.RaiseCanExecuteChanged();
}
},
() =>
{
return(Initialized && _index < _filterList.Count - 1);
});
PreviousFilterCommand = new RelayCommand(
() =>
{
if (_index > 0)
{
_index--;
_changeFilterRequest = true;
NextFilterCommand.RaiseCanExecuteChanged();
PreviousFilterCommand.RaiseCanExecuteChanged();
}
},
() =>
{
return(Initialized && _index > 0);
});
}
