private void Uninitialize()
{
_initialized = false;
if (_timer != null)
{
_timer.Stop();
_timer.Tick -= DispatcherTimer_Tick;
_timer = null;
}
if (_renderer != null)
{
_renderer.Dispose();
_renderer = null;
}
if (_effect != null)
{
_effect.Dispose();
_effect = null;
}
_filters = null;
_chromaKeyFilter = null;
_rotationFilter = null;
_bitmap = null;
if (_source != null)
{
_source.Dispose();
_source = null;
}
}
private void Cleanup()
{
System.Diagnostics.Debug.WriteLine("Cleaning up scanner");
try
{
_Ready = false;
_Done = true;
_Rendering = true;
_Controller = null;
_ImagePreview = null;
_Effects = null;
_Render.Dispose();
_Render = null;
_Image = null;
_Source.StopPreviewAsync();
_Source.PreviewFrameAvailable -= OnPreviewFrameAvailable;
_Source.Dispose();
_Source = null;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Cleaning up scanner. {0}", ex.Message);
}
}
private void Cleanup()
{
if (!_cleanedUp)
{
// Free all - NECESSARY TO CLEANUP PROPERLY !
_cameraPreviewImageSource.PreviewFrameAvailable -= OnPreviewFrameAvailable;
_capturing = false;
_cameraPreviewImageSource.Dispose();
_writeableBitmapRenderer.Dispose();
_cleanedUp = true;
}
}
/// <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;
}
}
private void Uninitialize()
{
if (_cameraPreviewImageSource != null)
{
_cameraPreviewImageSource.Dispose();
_cameraPreviewImageSource = null;
}
if (_blendEffect != null)
{
_blendEffect.Dispose();
_blendEffect = null;
}
if (_blendImageProvider != null)
{
_blendImageProvider = null;
}
}
private async Task Render()
{
if (!_rendering && !_stop)
{
_rendering = true;
// Render camera preview frame to screen
_writeableBitmapRenderer.Source = _cameraPreviewImageSource;
_writeableBitmapRenderer.WriteableBitmap = _writeableBitmap;
await _writeableBitmapRenderer.RenderAsync();
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(
CoreDispatcherPriority.High, () =>
{
_writeableBitmap.Invalidate();
});
// Write camera preview frame to file if capturing
if (_capturing)
{
if (_sequenceIndex < 20)
{
_jpegRenderer.Source = _cameraPreviewImageSource;
IBuffer jpg = await _jpegRenderer.RenderAsync();
await Save(jpg, _sequenceIndex ++);
}
else
{
StartStopCapture();
}
}
_rendering = false;
}
if (_stop)
{
_capturing = false;
_cameraPreviewImageSource.Dispose();
_writeableBitmapRenderer.Dispose();
_jpegRenderer.Dispose();
}
}
}//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
private void Uninitialize()
{
if (_cameraPreviewImageSource != null)
{
_cameraPreviewImageSource.Dispose();
_cameraPreviewImageSource = null;
}
if (_filterEffect != null)
{
_filterEffect.Dispose();
_filterEffect = null;
}
if (_customEffect != null)
{
_customEffect.Dispose();
_customEffect = null;
}
}