private async void Clean()
{
if (_cameraPreviewImageSource != null)
{
await _cameraPreviewImageSource.StopPreviewAsync();
_cameraPreviewImageSource.PreviewFrameAvailable -= OnPreviewFrameAvailable;
}
if (_timer != null)
{
_timer.Stop();
}
}
public async Task PausePreviewAsync()
{
if (_initialized)
{
await _cameraPreviewImageSource.StopPreviewAsync();
}
}
private async void Dispose()
{
if (_cameraPreviewImageSource != null)
{
await _cameraPreviewImageSource.StopPreviewAsync();
}
if (_timer != null)
{
_timer.Stop();
}
}
public override async Task StopScanning()
{
_Done = true;
_Ready = false;
// wait for render cycle to end
DateTime start = DateTime.Now;
while (_Rendering)
{
if (DateTime.Now.Subtract(start).TotalMilliseconds > 1000)
{
break;
}
await Task.Delay(10);
}
await _Source.StopPreviewAsync();
Cleanup();
}
/// <summary>
/// Initialize and start the camera preview
/// </summary>
public async Task InitializeAsync()
{
if (CaptureButton.Content.ToString().Equals("Capture and Canny"))
{
CaptureButton.Content = "Stop";
// Create a camera preview image source (from Imaging SDK)
if (_cameraPreviewImageSource == null)
{
_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);
_writeableBitmap = bitmap;
// Create a filter effect to be used with the source (e.g. used to correct rotation)
//_effect = new FilterEffect(_cameraPreviewImageSource);
//_effect.Filters = new IFilter[] { new RotationFilter(90.0) };
//_writeableBitmapRenderer = new WriteableBitmapRenderer(_effect, _writeableBitmap);
RotationEffect rotation = new RotationEffect(_cameraPreviewImageSource, 90);
_writeableBitmapRenderer = new WriteableBitmapRenderer(rotation, _writeableBitmap);
//_writeableBitmapRenderer.Source = new EffectList() { _cameraPreviewImageSource, rotation };
//_writeableBitmapRenderer.WriteableBitmap = _writeableBitmap;
ImageView.Source = _writeableBitmap;
// Attach preview frame delegate
_cameraPreviewImageSource.PreviewFrameAvailable += OnPreviewFrameAvailable;
}
else
{
if (CaptureButton.Content.ToString().Equals("Stop"))
{
await _cameraPreviewImageSource.StopPreviewAsync();
_cameraPreviewImageSource.Dispose();
_cameraPreviewImageSource = null;
}
CaptureButton.Content = "Capture and Canny";
ImageView.Source = null;
}
}
/// <summary>
/// Initialize and start the camera preview
/// </summary>
public async Task InitializeAsync()
{
if (CaptureButton.Content.ToString().Equals("Capture and Canny"))
{
LoadButton.Visibility = Visibility.Collapsed;
CaptureButton.Content = "Stop";
// Create a camera preview image source (from Imaging SDK)
if (_cameraPreviewImageSource == null)
{
_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);
_writeableBitmap = bitmap;
// Create a filter effect to be used with the source (no filters yet)
//_effect = new FilterEffect(_cameraPreviewImageSource);
//_writeableBitmapRenderer = new WriteableBitmapRenderer(_effect, _writeableBitmap);
_writeableBitmapRenderer = new WriteableBitmapRenderer(_cameraPreviewImageSource, _writeableBitmap);
ImageView.Source = _writeableBitmap;
// Attach preview frame delegate
_cameraPreviewImageSource.PreviewFrameAvailable += OnPreviewFrameAvailable;
}
else
{
if (CaptureButton.Content.ToString().Equals("Stop"))
{
await _cameraPreviewImageSource.StopPreviewAsync();
_cameraPreviewImageSource.Dispose();
_cameraPreviewImageSource = null;
}
CaptureButton.Content = "Capture and Canny";
LoadButton.Visibility = Visibility.Visible;
ImageView.Source = null;
}
}
}//hide progressBar
private async Task DisposeResourcesAsync()
{
HideCommandBar();
DisposeArray();
if (bitmapRenderer != null)
{
bitmapRenderer.Dispose();
}
bitmapRenderer = null;
if (isPreviewing && (cameraSource != null))
{
await cameraSource.StopPreviewAsync();
cameraSource.Dispose();
}
cameraSource = null;
GC.Collect();
}//dispose page resources