<AWT Dev> [11][JDK-8171000]Robot.createScreenCapture() crashes in wayland mode

Manajit Halder manajit.halder at oracle.com
Mon Feb 5 07:45:23 UTC 2018

Looks good to me


> On 05-Feb-2018, at 9:59 AM, Sergey Bylokhov <Sergey.Bylokhov at oracle.com> wrote:
> OK, then it looks fine.
> On 03/02/2018 20:13, Krishna Addepalli wrote:
>> Hi Sergey,
>> I'm aware of the C99 thing, so I looked around in the file before making those changes. For example, within the same function that I modified, I found variable declarations inside the for loop:
>>     for (reg = (image_region_type *) first_in_list( regions); reg;
>>           reg = (image_region_type *) next_in_list( regions))
>>      {
>>                  int32_t rect;
>>                  struct my_XRegion *vis_reg;
>> And also, in couple of other places within the same file, the some variables were declared within if blocks. That's when I moved the variable declarations to the point of use.
>> Thanks,
>> Krishna
>> -----Original Message-----
>> From: Sergey Bylokhov
>> Sent: Saturday, February 3, 2018 1:27 PM
>> To: Krishna Addepalli <krishna.addepalli at oracle.com>; awt-dev at openjdk.java.net
>> Subject: Re: <AWT Dev> [11][JDK-8171000]Robot.createScreenCapture() crashes in wayland mode
>> Hi, Krishna.
>> The change of local types declarations looks reasonable, but I am not sure that C99 will be supported by all compilers which will be used to build jdk where this fix will be used.
>> I suggest to simplify the fix and add only one null check to it.
>> On 01/02/2018 04:06, Krishna Addepalli wrote:
>>> Hi All,
>>> Please review a fix for JDK-8171000:
>>> https://bugs.openjdk.java.net/browse/JDK-8171000
>>> Webrev: http://cr.openjdk.java.net/~kaddepalli/8171000/webrev00/
>>> The crash happens since XGetImage can return NULL in case of Wayland,
>>> which doesnot permit reading screen pixels outside the owning window.
>>> Added a null check to prevent the same, and also refactored and
>>> removed unnecessary code to make the function simpler.
>>> Thanks,
>>> Krishna
>> --
>> Best regards, Sergey.
> -- 
> Best regards, Sergey.

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