public async void capture(bool get_preview, bool register)
{
if (get_preview == true)
{
_camera.GetPreviewBufferArgb(preview_image);
}
// Take a picture. Flag busy meanwhile.
cam_busy = true;
// If register mode is enabled, sleep for 500ms.
if (register == true)
{
await System.Threading.Tasks.Task.Delay(500);
}
await _camsequence.StartCaptureAsync();
cam_busy = false;
transmit = true;
imstream.Seek(0, SeekOrigin.Begin);
}
/// <summary>
/// Asynchronously captures a frame for further usage.
/// </summary>
private async Task CaptureAsync()
{
if (!_focusing && !_capturing)
{
_capturing = true;
ProgressBar.IsIndeterminate = true;
ProgressBar.Visibility = Visibility.Visible;
var stream = new MemoryStream();
try
{
var sequence = _device.CreateCaptureSequence(1);
sequence.Frames[0].CaptureStream = stream.AsOutputStream();
await _device.PrepareCaptureSequenceAsync(sequence);
// Freeze preview image to avoid viewfinder showing live feed during/after capture
var freezeBitmap = new WriteableBitmap((int)_device.PreviewResolution.Width, (int)_device.PreviewResolution.Height);
_device.GetPreviewBufferArgb(freezeBitmap.Pixels);
freezeBitmap.Invalidate();
FreezeImage.Source = freezeBitmap;
FreezeImage.Visibility = Visibility.Visible;
await sequence.StartCaptureAsync();
}
catch (Exception)
{
stream.Close();
}
ProgressBar.Visibility = Visibility.Collapsed;
ProgressBar.IsIndeterminate = false;
_capturing = false;
if (stream.CanRead)
{
PhotoModel.Singleton.FromNewImage(stream, PhotoOrigin.Camera);
if (_picker)
{
NavigationService.GoBack();
}
else
{
if (_lens)
{
NavigationService.Navigate(new Uri("/Pages/MagnifierPage.xaml?editor", UriKind.Relative));
}
else
{
NavigationService.Navigate(new Uri("/Pages/MagnifierPage.xaml", UriKind.Relative));
}
}
}
else
{
FreezeImage.Visibility = Visibility.Collapsed;
FreezeImage.Source = null;
}
}
}
