Performance optimization for image refresh
I would like to understand how to get the fastest possible effective frame rate when performing continuous image updates as described below. There is some network traffic that seems unnecessary and I wonder if I can get Wt to avoid it. ¶
During session initialization:
mpTheImage = new WImage(WLink(), "alternate text", root());
The handler ImageDisplayApp::HandleImageRequest() renders the next frame's pixels and then:
WLink vLink.setResource(mpImageResource); // mpImageResource points to a WMemoryResource in heap
After the first frame is rendered, I see on the network that the onload event causes a POST command from the browser, a server response, and then a GET for the image resource. This means 2 round trips for each frame. Can this be avoided, perhaps by getting the imageLoaded event to issue a GET directly, or maybe a POST for the image resource directly without an intermediate step?
If standard Wt steps can't do this, do you have support for sockets so I could implement my own streamlined protocol?
Thanks for helping.