Thanks Omair. Now the problem is clear. And your last fix looks great.
I've just filed
6987945: XDecoratedPeer shouldn't allow to resize a frame to zero size
so that you could push your fix. Thanks!
--
best regards,
Anthony
On 09/27/2010 08:36 PM, Omair Majid wrote:
Hi Anthony,
On 09/24/2010 04:27 PM, Anthony Petrov wrote:
Hi Omair,
On 9/24/2010 6:12 PM, Omair Majid wrote:
While trying out a Java program, I noticed that some BadValue X errors
were being reported (I had to set -Dsun.awt.noisyerrorhandler=True
first). The webrev at
http://cr.openjdk.java.net/~omajid/webrevs/x11-bad-widths-heights/webrev.00/
attempts to fix the issue.
Updated webrev at
http://cr.openjdk.java.net/~omajid/webrevs/x11-bad-widths-heights/webrev.01/
Please make sure you put the true-branches of the if statements into {}
blocks.
I noticed that XBaseWindow is already doing a check like this using the
constant MIN_SIZE and the math library. So I switched to that instead. I
will keep this style guideline in mind for any future patches.
Do I understand correctly that we're fixing an issue with top-level
windows only? If so, then I suggest to not touch the code in the
XBasWindow, but rather tweak the bounds in the XWindowPeer where we add
them to the create params map. (and perhaps in the XDecoratedPeer - need
to check if their logic of initializing the params is separate or not.)
Yes, I can only create this issue with top-level windows. The issue does
not happen on initialization (checkParams in XBaseWindow takes care of
that). It only happens on resizing after initialization.
checkShellRectSize() in XDecoratedPeer is supposed to correct the size,
but it misses out the corner case where widths and heights are exactly
zero. XWindowPeer (and other X peers) call xSetBounds which already
takes care of the zero case.
For the sake of consistency, I have made sure that all the places which
check for the widht or height <= 0 case use Math.max(MIN_SIZE, width)
just like XBaseWindow.checkParams().
The problem is that there are some cases where the jdk is creating or
resizing windows and setting widths and/or heights to 0. The man page
What are the exact cases?
The attached program, when run with -Dsun.awt.noisyerrorhandler=True
prints out a BadValue error caused by X_ConfigureWindow. Before
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6678385, this would
have caused the process to crash. Currently the resize in the test
program does not do anything; with the fix applied it would set it to
the smallest size possible.
Thanks,
Omair
--
best regards,
Anthony
for XResizeWindow states "If either width or height is zero, a BadValue
error results". I looked at the source code for xorg-xserver and it
appears that specifying a height or width of 0 for pretty much any X
call will cause a BadValue error.
The patch takes an approach similar to what is currently being done in
XBaseWindow.xSetBounds(). It checks heights and widths, setting them to
1 if needed.
Any comments?
Cheers,
Omair
