JDK-2177444 : Translucent windows are completely repainted on every paint event, on Windows
  • Type: Backport
  • Backport of: JDK-6794764
  • Component: client-libs
  • Sub-Component: java.awt
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2009-04-30
  • Updated: 2011-03-07
  • Resolved: 2011-03-07
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JDK 6 JDK 7
6u18Fixed 7 b60Fixed
Comments
EVALUATION Not approved for JDK 7 M3. This non-critical performance fix can wait until M4.
04-05-2009
EVALUATION The fix is to reuse TranslucentWindowPainter back buffer when painting into perpixel translucent windows. Roughly, the fix is: WWindowPeer.java: + @Override + public Graphics getGraphics() { + if (isOpaque) { + return super.getGraphics(); + } else { + return painter.getBackBuffer(false).getGraphics(); + } + } Another issue I noticed while working on the fix is that on Windows (and X11 as well) platform it is AWT who is responsible for filling the background for perpixel translucent windows. This was not a problem for 6u10, but it should be taken into consideration when the translucency mode is controlled with Window.setBackground() method.
30-04-2009