/// <summary>
/// Retrieves the cursor information contained in the currently duplicated frame, populating the specified desktop frame.
/// </summary>
/// <param name="frame"></param>
/// <param name="frameInfo"></param>
public void RetrieveCursorMetadata(DesktopFrame frame, OutduplFrameInfo frameInfo)
{
// A non-zero mouse update timestamp indicates that there is a mouse position update and optionally a shape change
if (frameInfo.LastMouseUpdateTime == 0)
{
frame.PointerPosition.Visible = _pointerInfo.Visible;
frame.PointerPosition.X = _pointerInfo.Position.X;
frame.PointerPosition.Y = _pointerInfo.Position.Y;
return;
}
bool updatePosition = true;
// Make sure we don't update pointer position wrongly
// If pointer is invisible, make sure we did not get an update from another output that the last time that said pointer
// was visible, if so, don't set it to invisible or update.
if (!frameInfo.PointerPosition.Visible && (_pointerInfo.WhoUpdatedPositionLast != _outputDeviceIndex))
{
updatePosition = false;
}
// If two outputs both say they have a visible, only update if new update has newer timestamp
if (frameInfo.PointerPosition.Visible && _pointerInfo.Visible &&
(_pointerInfo.WhoUpdatedPositionLast != _outputDeviceIndex) &&
(_pointerInfo.LastTimeStamp > frameInfo.LastMouseUpdateTime))
{
updatePosition = false;
}
// Update position
if (updatePosition)
{
_pointerInfo.Position = new Point(frameInfo.PointerPosition.Position.X, frameInfo.PointerPosition.Position.Y);
_pointerInfo.WhoUpdatedPositionLast = _outputDeviceIndex;
_pointerInfo.LastTimeStamp = frameInfo.LastMouseUpdateTime;
_pointerInfo.Visible = frameInfo.PointerPosition.Visible;
}
frame.PointerPosition.Visible = _pointerInfo.Visible;
frame.PointerPosition.X = _pointerInfo.Position.X;
frame.PointerPosition.Y = _pointerInfo.Position.Y;
// No new shape
if (frameInfo.PointerShapeBufferSize == 0)
{
return;
}
if (_pointerInfo.ShapeBuffer == null || frameInfo.PointerShapeBufferSize != _pointerInfo.ShapeBuffer.Length)
{
_pointerInfo.ShapeBuffer = new byte[frameInfo.PointerShapeBufferSize];
}
try
{
// Create a new pinned region of memory, copy the contents of the PtrShapeBuffer to it, use it to retrieve the pointer shape and then free the pinned region.
unsafe
{
fixed(byte *ptrShapeBufferPtr = _pointerInfo.ShapeBuffer)
{
_outputDuplication.GetFramePointerShape(frameInfo.PointerShapeBufferSize, (IntPtr)ptrShapeBufferPtr, out int bufferSize, out _pointerInfo.ShapeInfo);
}
}
}
catch (SharpGenException ex)
{
if (ex.ResultCode.Failure)
{
throw new DesktopDuplicationException("Failed to get frame pointer shape.");
}
}
var pointerShapeSpan = new ReadOnlySpan <byte>(_pointerInfo.ShapeBuffer);
if (!pointerShapeSpan.Trim((byte)0x00).IsEmpty)
{
frame.PointerShape.Width = _pointerInfo.ShapeInfo.Width;
frame.PointerShape.Height = _pointerInfo.ShapeInfo.Height;
frame.PointerShape.Pitch = _pointerInfo.ShapeInfo.Pitch;
frame.PointerShape.Type = _pointerInfo.ShapeInfo.Type;
frame.PointerShape.HotSpotX = _pointerInfo.ShapeInfo.HotSpot.X;
frame.PointerShape.HotSpotY = _pointerInfo.ShapeInfo.HotSpot.Y;
frame.PointerShapeBuffer = _pointerInfo.ShapeBuffer;
}
}
