!7

cmodule VectorImageStream > DynImageSurfaceAndEnabled {
  transient S fpsText;
  transient new PerSecondCounter fpsCounter;
  
  start {
    enableDoubleBuffering(); // flickers when partially obscured otherwise
    dm_vmBus_onMessage_q vectorSDK_gotLine((mod, s) -> handleLine((S) s));
    dm_doEvery(1.0, r {
      setField(fpsText := print(fpsCounter.getLast() + " fps"));
    });
  }
  
  void handleLine(S s) {
    S prefix = "img: ";
    if (!enabled || !startsWith(s, prefix)) ret;
    fpsCounter.inc();
    setImage(imageFromBytes(base64decode(substring(s, prefix))));
  }
  
  void startStream enter {
    dm_call vectorSDK('startCamStream);
  }
  
  JPanel makeControlArea() {
    JPanel buttons = super.makeControlArea();
    addComponent_inFront(buttons, jbutton("Start stream", rThread startStream));
    ret centerAndEastWithMargin(dm_label fpsText(), buttons);
  }
}