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  1. JDK
  2. JDK-8089313

Transparent stage resize flickers on Mac



    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Cannot Reproduce
    • Affects Version/s: fx2.0.2
    • Fix Version/s: None
    • Component/s: javafx
    • Labels:
    • Environment:

      Mac OS X Lion
      Apple Cinema Display (more than full HD resolution).
      High performance multicore Mac Pro with recent Radeon 5870 graphics card.


      Resizing the stage causes window flickering on Mac OS X Lion.

      To confirm that this is not just our application, I ran the "Advanced Area Chart" demo of the Ensemble application. Resizing the Ensemble window very fast on my Apple LED Cinema display at high resolution, caused moderate flickering - I could resize it perhaps 10-12 times moving my mouse back and forth rapidly and then it would do a full window flicker where the window is all black for perhaps 100 milliseconds.

      I am testing on a new high performance Mac Pro with a 1GB Radeon 5870 graphics card, so I expect the results to be worse on other systems.

      In my own application, the background is transparent because we render a window with rounded corners. In this app, the flickering looks extreme. Even just slowly dragging the resize handle of the window leads to constant full window flickering - it looks as if the window paints all transparent every second frame and fully rendered every other frame.

      I realize that the clear difference between my app and the Ensemble demo could prove that this is application specific. But it could also prove that running an application with


      in general causes flickering on the Mac, because as soon as I remove the initStyle call, the flickering is reduced to what is seen in the Ensemble app.

      With StageStyle.TRANSPARENT I tried simplifying our app by removing all but one of my tabbed panes and showing only very little content, and the flickering is still extreme. I even restyled the app to replace the large gradient background with a solid color. Still the same extreme flickering.

      I improved the situation by adding
      to the root node of the scene. Now if I resize the window from 1920x1080 down to half the size, it flickers only perhaps 3-4 times in the process, and not every other frame as before. But it still flickers from fully transparent to fully painted and often enough to look pretty bad.

      I sincerely hope we will be able to fix this before our application is shown to customers, but I am afraid it is a bug in JavaFX.


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              ckyang Chien Yang (Inactive)
              risaksen Randahl Isaksen
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