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();
}
}