1fab978a95
The timing of PresentCompleteNotify events is inaccurate when a driver uses TearFree because there's no way to know exactly when a presentation will appear on the display without receiving a notification directly from the driver indicating that the TearFree flip containing a presentation's pixmap is actually visible on the display. To fix the inaccurate PresentCompleteNotify timing, make use of the new assumption that drivers which export TearFree permit a NULL pixmap to be passed to their flip callback in order to make a presentation track the exact TearFree flip responsible for rendering it onto the display. Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com> Acked-by: Martin Roukala <martin.roukala@mupuf.org>
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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