/// <summary>
/// Updates the image in the picture box from the Pi system.
/// Image must be available in the Pi system when this method is executing.
/// </summary>
public void UpdateImage()
{
if (PiImage != null)
{
long w = 0;
long h = 0;
long d = 0;
ImageDataType dt;
IntPtr data = PiImage.GetData(out w, out h, out d, out dt);
if (w > int.MaxValue)
{
throw new InvalidOperationException("Image width is too large to be shown.");
}
if (h > int.MaxValue)
{
throw new InvalidOperationException("Image height is too large to be shown.");
}
if (d > int.MaxValue)
{
throw new InvalidOperationException("Image depth is too large to be shown.");
}
CopyFromPointerToTemp(data, (int)w, (int)h, (int)d, dt);
}
else
{
CopyFromPointerToTemp(IntPtr.Zero, 0, 0, 0, ImageDataType.UInt8);
}
UpdateScreen();
}
private void CopyFromPiTask(CancellationToken cancellationToken)
{
try
{
if (PiImage != null)
{
// NOTE: This can be used for testing the task system responsiveness
//for (int n = 0; n < 100; n++)
//{
// cancellationToken.ThrowIfCancellationRequested();
// Thread.Sleep(1);
//}
long w = 0;
long h = 0;
long d = 0;
ImageDataType dt;
IntPtr data = PiImage.GetData(out w, out h, out d, out dt);
cancellationToken.ThrowIfCancellationRequested();
TemporaryBitmapData.CopyFromPointerToTemp(data, w, h, d, dt, Slice, cancellationToken);
}
else
{
TemporaryBitmapData.CopyFromPointerToTemp(IntPtr.Zero, 0, 0, 0, ImageDataType.UInt8, Slice, cancellationToken);
}
cancellationToken.ThrowIfCancellationRequested();
// Swap the bitmaps in the UI thread
sync.Post(new SendOrPostCallback(o =>
{
// NOTE: Here we are in the UI thread but a new loading task might have started before we get here.
// Proceed only if a new loading task has not been started, i.e. the token source is the same than
// what it was when this task was started.
if (canc != null && canc.Token == cancellationToken)
{
var temp = ActiveBitmapData;
ActiveBitmapData = TemporaryBitmapData;
TemporaryBitmapData = temp;
UpdateScreen();
if (ImageLoaded != null)
{
ImageLoaded(this, EventArgs.Empty);
}
}
}), new object());
}
catch (TaskCanceledException)
{
throw;
}
}
