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Subject: Re: Fullscreen application with Cygwin/X in multiwindow mode
To: cygwin AT cygwin DOT com, David Chamberlain <dc46and2 AT gmail DOT com>
References: <CAHvVhSvJVtmNXQLxKNvhWUxH6MzCeaq-ZchCR9hcHk54yRDx3w AT mail DOT gmail DOT com> <9494ede9-ec64-bb79-8f8f-9bfb37c12f3b AT dronecode DOT org DOT uk> <CAHvVhSsKLVVZZ7W6wES6btb9oad4ixxQqBAR6xXisLVtmsKgyQ AT mail DOT gmail DOT com> <1265548510 DOT 20161129143736 AT yandex DOT ru>
From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID: <b133f87a-3c84-9085-03cd-926ae0dcb1f6@dronecode.org.uk>
Date: Thu, 1 Dec 2016 12:23:38 +0000
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On 29/11/2016 11:37, Andrey Repin wrote:
>>> But ideally this would be fixed by adding support for
>>> _NET_WM_STATE_FULLSCREEN to the WM.
>
>> Any idea how much effort would be required to implement the fullscreen
>> support? Any major hurdles to overcome? It may be something I could
>> work on in my spare time.

Patches are always welcome.

I think this should be pretty straightforward to add, although it might 
be a bit tedious.

[1],[2] should help you get started :)

Looking at this in a little more detail, I wasn't quite accurate in my 
statement above: There is very limited support for this state, in that 
windows which are created with it are probably shown correctly.

I think what's needed is extend the handling of _NET_WM_STATE messages 
so it can handle a window being changed to _NET_WM_STATE_FULLSCREEN. (At 
the moment _NET_WM_STATE is, only handled when it can be mapped down to 
an equivalent WM_CHANGE_STATE message, see [3])

[1] https://x.cygwin.com/docs/cg/cygwin-x-cg.html
[2] https://specifications.freedesktop.org/wm-spec/wm-spec-latest.html
[3] 
https://cgit.freedesktop.org/~jturney/xserver/commit/?h=cygwin-release-1.19&id=55c2ca8cd9287850077102d4ba662cfd2c571ca9

> Depends, what you mean by "fullscreen". All too often people say "fullscreen"
> when in fact they mean "borderless windowed".
> The difference is crucial.
> For the latter, you don't do anything short of setting some additional flags
> on your window and size it to display resolution.

In this context, _NET_WM_STATE_FULLSCREEN means 'borderless maximized'


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