public void RefreshMostRecentFrame()
{
if (mostRecentFrame == null)
{
return;
}
//Prepare the temp frame for annotations
if (tempFrame == null || !tempFrame.SameSizeAs(mostRecentFrame))
{
tempFrame = mostRecentFrame.Clone();
}
else
{
tempFrame.DrawFrame(mostRecentFrame);
}
tempFrame.FrameIndex = mostRecentFrame.FrameIndex;
tempFrame.ProcessorResult = mostRecentFrame.ProcessorResult;
if (OnRefreshMostRecentFrame != null)
{
OnRefreshMostRecentFrame(tempFrame);
}
tempFrame.CopyToWriteableBitmap(canvasBuffer);
}
private void ShowFrame(Filters.Frame frame)
{
if (isDrawing)
{
return;
}
if (Application.Current == null)
{
return;
}
Application.Current.Dispatcher.Invoke(new Action(() =>
{
if (Application.Current == null)
{
return;
}
isDrawing = true;
//Create WriteableBitmap the first time
if (canvasBuffer == null || canvasBuffer.Height != frame.Height || canvasBuffer.Width != frame.Width)
{
canvasBuffer = new WriteableBitmap(frame.Width, frame.Height, 96, 96, PixelFormats.Bgr24, null);
Canvas.Source = canvasBuffer;
mostRecentFrame = frame.Clone();
}
//Limit frame rate shown
if ((DateTime.Now - prevFrameTime).TotalMilliseconds >= 1000.0 / maxFps)
{
//Save the most recent frame
mostRecentFrame.DrawFrame(frame);
mostRecentFrame.ProcessorResult = frame.ProcessorResult;
mostRecentFrame.FrameIndex = frame.FrameIndex;
if (OnShowFrame != null)
{
OnShowFrame(frame);
}
RefreshMostRecentFrame();
prevFrameTime = DateTime.Now;
}
_sliderValueChangedByCode = true;
sliderTime.Value = frame.FramePercentage * 1000;
lblTime.Content = frame.FrameTime.ToString();
//Compute FPS
var now = DateTime.Now;
fpsHist.AddLast(now);
lblFPS.Content = string.Format("FPS: {0:n1}", fpsHist.Count / 1.0);
while ((now - fpsHist.First()).TotalMilliseconds > 1000)
{
fpsHist.RemoveFirst();
}
isDrawing = false;
}));
}
