Re: [PATCH v3 0/3] MR1003: gdiplus: Use atomic write for releasing GpImage lock.

[Esme Povirk (＠madewokherd)]

On Sun Oct 23 15:41:11 2022 +0000, Jinoh Kang wrote:
> According to https://testbot.winehq.org/JobDetails.pl?Key=125324, GDI+
> acts weird when the bitmap is rotate-flipped while being locked.
> Some observations:
> - GdipImageRotateFlip succeeds after GdipBitmapLockBits.
> - After rotate-flip, the bitmap is still in locked state.
> - GdipBitmapUnlockBits fails with error 7 (Win32Error) after GdipImageRotateFlip.
> - Subsequent attempts to access the pixels or lock bits succeeds, but
>
> the Scan0 is different from the initial BitmapData.
> Normally I'd add these to tests, but I'm afraid I'm actually running
> into undefined behaviour.  Perhaps test in a child process?

I think that behavior is strange enough that we shouldn't worry about it, at least not until we see a real app doing this. Thank you for checking.