[RFC wayland-protocols v2] Screensaver/blanking inhibition

[Bryce Harrington]

A "screensaver inhibition protocol" is on the set of needed enhancements
for Wayland.  This should turn off screen blanking and any running
screensaver for a period, then re-enabling it later.

An obvious use case is giving presentations.  Other use cases include
games, kiosk, automotive infotainment systems.

I'd like to take a shot at defining the protocol for this and
implementing it for Weston.  The design I have in mind mostly follows
xdg-screensaver and the DBUS screensaver API[1], which provide a
desktop-neutral 'inhibit' mechanism to temporarily disable the
screensaver/screenblanker on a per-process basis, except that it will be
per-surface instead of per-process.

So, after issuing the inhibit request for a surface, the screensaver
(and screenblanking) will be blocked until the surface is destroyed,
disabled, or otherwise loses visibility or becomes occluded.

---

v2: Stripped away most of the extraneous ideas.  So this is now strictly
just the inhibition request, which affects only the display(s) the
surface is actually visible on.

Bryce Harrington (1):
  Add screensaver inhibition protocol

 Makefile.am                                        |  1 +
 unstable/screensaver-inhibit/README                |  4 ++
 .../screensaver-inhibit-unstable-v1.xml            | 80 ++++++++++++++++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 unstable/screensaver-inhibit/README
 create mode 100644 unstable/screensaver-inhibit/screensaver-inhibit-unstable-v1.xml

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1.9.1