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  1. JDK
  2. JDK-4984142

REGRESSION:Graphics.copyarea() the overlapped window causes repaint errors

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    • Subcomponent:
    • Resolved In Build:
      b42
    • CPU:
      x86
    • OS:
      linux

      Description


      ###@###.### 2004-01-27

      J2SE Version (please include all output from java -version flag):
        java version "1.5.0-beta"
        Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32)
        Java HotSpot(TM) Client VM (build 1.5.0-beta-b32, mixed mode)

      Does this problem occur on J2SE 1.4 or 1.4.1 or 1.4.2? Yes / No (pick one)
        No. works fine with 1.4.2.

      Operating System Configuration Information (be specific):
        Linux (Debian Unstable), can be reproduced on RedHat 7.3 as well

      Hardware Configuration Information (be specific):
        Dell Inspiron 8500, 1GB RAM, Nvidia graphics adapter


      Bug Description:
        Graphics.copyarea() is used in may scrolling components. The
        documentation states that paint() is invoked for regions that could not
        be copied because they were obscured by an overlapping window:

            * If a portion of the source rectangle lies outside the bounds
            * of the component, or is obscured by another window or component,
            * <code>copyArea</code> will be unable to copy the associated
            * pixels. The area that is omitted can be refreshed by calling
            * the component's <code>paint</code> method.

        This works fine with J2SDK1.4.2 but does no longer work with J2SDK
        1.5.0b32 on Linux. Works fine on Windows.


      Steps to Reproduce (be specific):
        Run the attached program on Linux and try scrolling using either
        scrollbar or mousewheel. Observe that the overlapped window causes
        repaint errors.


      Test program:

      import javax.swing.*;

      public class CopyAreaTest
      {
              public static void main(String[] args)
              {
                      StringBuffer buf = new StringBuffer();
                      for (int i = 0; i < 1000; i++)
                      {
                              buf.append("This is line"+i+"\n");
                      }
                      JTextArea textArea = new JTextArea(buf.toString());
                      JFrame frame = new JFrame("Test");
                      frame.getContentPane().add(new JScrollPane(textArea));
                      frame.pack();
                      frame.setBounds(100,100,500,500);
                      frame.show();
                      JWindow window = new JWindow(frame);
                      window.setBounds(150,150,200,200);
                      window.show();
              }
      }

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              Assignee:
              ant Anton Tarasov
              Reporter:
              tyao Ting-Yun Ingrid Yao (Inactive)
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