[Bug 52254] New: Cold Steel Subs: Application is not transparent (relies on DwmExtendFrameIntoClientArea)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52254

Bug ID: 52254
           Summary: Cold Steel Subs: Application is not transparent
                    (relies on DwmExtendFrameIntoClientArea)
           Product: Wine
           Version: 7.0-rc2
          Hardware: x86-64
               URL: https://zerofield.net/2020/09/30/hajimari-no-kiseki-sp
                    readsheet-translation/
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dwmapi
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 71376
  --> https://bugs.winehq.org/attachment.cgi?id=71376
ColdSteelSubs transparency code (currently not in the distributed application)

This application provides a transparent clickthrough overlay to show English
translations on top of the original Japanese source.

It relies on layered windows and DwmExtendFrameIntoClientArea to handle the
transparent display.

Currently, the main UI elements show, but the game (or any other application)
does not show through.  This seems to be because DwmExtendFrameIntoClientArea
is only a stub. I'm not sure if that's the only reason it's not transparent,
but it's at least one of the reasons.

The program itself uses the unity3d engine along with some native dll calls to
the relevant user32 apis to handle the transparency.

I was able to get a copy of the relevant code (but not the whole application),
of which I will attach.

Since I can't get all of the code, I've been using an unity sample application
to try to figure out some parts myself (the relevant code is here
https://github.com/pheonise/Unity3D-Desktop-Overlay/blob/master/Assets/Scrip...).

This unity3d application works as expected on windows, but is not transparent
via  wine (as expected).  When i comment the call to
DwmExtendFrameIntoClientArea, then it its also no longer transparent on windows
as well.

It seems that if the sample application works, then I can make sure the dev
applies to the same technique to the overlay application.

Please let me know If i can provide any more information.

[Bug 52254] Cold Steel Subs: Application is not transparent (relies on DwmExtendFrameIntoClientArea)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52254

--- Comment #1 from Johnny Robeson  ---
I've built the desktop overlay application and uploaded it here:
https://www.dropbox.com/s/mi1g5nlif3hhsq8/Unity3D-Desktop-Overlay.tar.gz

[Bug 52254] Cold Steel Subs: Application is not transparent (relies on DwmExtendFrameIntoClientArea)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52254

--- Comment #2 from Johnny Robeson  ---
Created attachment 71378
  --> https://bugs.winehq.org/attachment.cgi?id=71378
simple win32 application that uses DwmExtendFrameIntoClientArea

I'm not sure how helpful this is, but i attached simple example of a win32
application hat uses DwmExtendFrameIntoClientArea and almost nothing else.

[Bug 52254] Cold Steel Subs: Application is not transparent (relies on DwmExtendFrameIntoClientArea)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52254

--- Comment #3 from Johnny Robeson  ---
Sorry, i realized i didn't mention that the application itself is free to use
and does not require the game to run. You can just download it and run the
executable.