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List:       openjdk-2d-dev
Subject:    Re: RFR: 8187759: Background not refreshed when painting over a transparent JFrame
From:       Tejesh R <tr () openjdk ! org>
Date:       2023-12-19 5:08:39
Message-ID: swvZsjJVMWgIYz-UB2l8vMb5ioSb_pbVBHS909HzZE0=.24679a7c-ec1f-4dfb-b4f9-bd03b44d82d0 () github ! com
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On Mon, 18 Dec 2023 16:15:09 GMT, Alexey Ivanov <aivanov@openjdk.org> wrote:

> > > > This is happening in linux
> > > > Is it the Linux only? If yes why it cannot be reproduced on macOS and \
> > > > Windows?
> > 
> > 
> > Yes, This is happening only in linux. The paintToOffScreen is done by \
> > BufferStrategyPaintManager rather than RepaintManager (which is the case in macOS \
> > and Windows).
> 
> Renjith @Renjithkannath worked on a similar bug, \
> [JDK-8256639](https://bugs.openjdk.org/browse/JDK-8256639): _Test \
> `javax/swing/JPopupMenu/7160604/bug7160604.java` fails on Ubuntu_, and he \
> reproduced the problem on macOS too, yet you have to make popups lightweight, \
> they're heavyweight on macOS by default. 
> He tracked it down to the same root cause. His suggested fix was very similar to \
> the one that @TejeshR13 proposes here. I wasn't convinced at that time that it was \
> the best fix but I hadn't had time to look into it further. 
> Neither have I looked at this code review thoroughly yet.
> 
> Unfortunately, JDK-8256639 cannot be opened because it contains confidential \
> information in its description.

Yeah, looks like both the issue has the same root cause... As per my analysis in \
bufferStrategyManager the Graphics used is `bsg` rather than what is passed down from \
Component. I confirmed the root cause by passing down the component Graphics to \
Offscreen painting where the issue didn't reproduce. Hence clearing the `bsg` \
Graphics solves the issue.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/17081#issuecomment-1862124907


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