d99b9ff0f2
Add support for per client randr-resolution change emulation using viewport, for apps which want to change the resolution when going fullscreen. Partly based on earlier work on this by Robert Mader <robert.mader@posteo.de> Note SDL2 and SFML do not restore randr resolution when going from fullscreen -> windowed, I believe this is caused by us still reporting the desktop resolution when they query the resolution. This is not a problem because when windowed the toplevel window size includes the window-decorations so it never matches the emulated resolution. One exception would be the window being resizable in Windowed mode and the user resizing the window so that including decorations it matches the emulated resolution *and* the window being at pos 0x0. But this is an extreme corner case. Still I will submit patches upstream to SDL2 and SFML to always restore the desktop resolution under Xwayland, disabling resolution emulation all together when going windowed. Reviewed-by: Olivier Fourdan <ofourdan@redhat.com> Acked-by: Michel Dänzer <mdaenzer@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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