private void colorConversionBackgroundWorker()
{
// Grouping the property change notifications in a batch.
List <PropertyChangedEventArgs> changeCache = new List <PropertyChangedEventArgs>();
changeCache.Add(new PropertyChangedEventArgs("CbText"));
changeCache.Add(new PropertyChangedEventArgs("CrText"));
changeCache.Add(new PropertyChangedEventArgs("CrOffset"));
changeCache.Add(new PropertyChangedEventArgs("CbOffset"));
changeCache.Add(new PropertyChangedEventArgs("YOffset"));
changeCache.Add(new PropertyChangedEventArgs("ArgbText"));
changeCache.Add(new PropertyChangedEventArgs("ArgbBrush"));
// Obtain the YCbCr layout settings used by the camera buffer.
var bufferLayout = cam.YCbCrPixelLayout;
// Allocate the appropriately sized preview buffer.
byte[] currentPreviewBuffer = new byte[bufferLayout.RequiredBufferSize];
// Continue processing until asked to stop in OnNavigatingFrom.
while (!bgPleaseExit)
{
// Get the current preview buffer from the camera.
cam.GetPreviewBufferYCbCr(currentPreviewBuffer);
// The output parameters used in the following method.
byte y;
int cr;
int cb;
// Extract details about the pixel where the camera crosshairs meet.
// This location is estimated to be X=320, Y=240. Adjust as desired.
GetYCbCrFromPixel(bufferLayout, currentPreviewBuffer, 320, 240, out y, out cr, out cb);
// Set page-level properties to the new YCbCr values.
Y = y;
Cb = cb;
Cr = cr;
Dispatcher.BeginInvoke(delegate()
{
// not threadsafe, but unlikely to be a problem in this case
// Consolidating change notifications
if (PropertyChanged != null)
{
foreach (var change in changeCache)
{
PropertyChanged(this, change);
}
}
});
}
}
/// <summary>
/// Copies the current viewfinder frame into a buffer for further manipulation.
/// </summary>
/// <param name="pixelData">The pixel data.</param>
/// <remarks>
/// This method is already protected and only called when the service is currently running.
/// </remarks>
protected override void GetPreviewBufferYCbCrFromCamera(byte[] pixelData)
{
_photoCamera.GetPreviewBufferYCbCr(pixelData);
}
/// <summary>
/// Copies the current viewfinder frame into a buffer for further manipulation.
/// </summary>
/// <param name="pixelData">The pixel data.</param>
public void GetPreviewBufferYCbCr(byte[] pixelData)
{
_photoCamera.GetPreviewBufferYCbCr(pixelData);
}