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From "Chunrong Lai (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4591) [classlib][awt] 0 bits color model with hardware acceleration?
Date Thu, 02 Aug 2007 04:22:52 GMT
[classlib][awt] 0 bits color model with hardware acceleration?
--------------------------------------------------------------

                 Key: HARMONY-4591
                 URL: https://issues.apache.org/jira/browse/HARMONY-4591
             Project: Harmony
          Issue Type: Bug
          Components: Classlib
         Environment: win32
            Reporter: Chunrong Lai



 Swing application may crash in some platforms with info of awt.26B (The number of bits in
the pixel values is less than 1) if turning on hardware accelerations.
 I can reproduce this issue in my win32+Sis651 Video card.
 I see that WinGraphicsDevice.getConfigurations return 36 configurations if without hardware
accelerations. where 24 of them are enabled later because the other 12 have pixeltype of WindowsDefs.PFD_TYPE_COLORINDEX.
If turning on the hardware acceleration I can see 48 configurations totally. I still see 12
of them have pixeltypes of PFD_TYPE_COLORINDEX. However I also see 6 configurations with get_cColorBits()
equals to 0 which lead to later exception in creating ColorModel.
 A simple fix is to modify winGraphicsConfiguration.<init> as follows

    private void init(Win32.PIXELFORMATDESCRIPTOR pfd) {
        flags = pfd.get_dwFlags();
        pixelType = pfd.get_iPixelType();
        if ((pixelType & WindowsDefs.PFD_TYPE_COLORINDEX) == WindowsDefs.PFD_TYPE_COLORINDEX)
{
            cm = null;
            return;
        }
 
        bits = pfd.get_cColorBits();
+       if (bits == 0) {
+            cm = null;
+            return;
+       }
        redBits = pfd.get_cRedBits();
        .......    
 

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