TriFan and TriStrip were added in 1.12, so we need to have that code
conditional to support older versions of Xorg.

There were a bunch of parameters that weren't properly added to the
man pages when the features were added. Make sure everything is
properly in sync.

They share a lot of settings, so make sure the documentation is
identical in those cases.

The funcationality was removed in 6e49e95, so let's also clean up
the documentation referring to it.

We had overlooked a few so we didn't track all screen changes properly.

We need to flip the dimensions in the case the monitor is rotated
90° or they won't map correctly to the framebuffer.

No longer tolerate loading the VNC extension but not being able to
initialize it. This avoids a lot of error prone checking to see
if the extension has started fully or not.

The normal Xorg server doesn't check this field, so neither can we
as there are applications relying on this leniancy.

It was moved to the common code in f8e3b34c6, but it was unreliable
because the state could sometimes get out of sync. Push it back in
to Xvnc since it isn't necessarily something all servers will have.

Otherwise we'll wedge the desktop object which expects an approval
or rejection to eventually show up.

It was only used by WinVNC, so push it there instead.

This adds the basic infrastructure and handshake for the QEMU
Extended Key Events extension. No viewer or server makes use of
the extra functionality yet though.

Based on QEMU's behaviour.

This will allow us to use better formats that preserve the entire
alpha channel.

The functions might change so we need to also make sure we grab
the updated value after each call. Clean up the code to use the
same style as the rest of the Xorg code.

One was missing a call to register the fd with the X server, and
one forgot to set it to non-blocking. One result of this was a crash
when hitting the blacklist.

xserver 1.19's OsInit will create a pollfd, followed by checking if fd 2 /
stderr is writable and if it is not, replacing fd 2 with /dev/null.

Since we close stderr in inetd mode to avoid xserver messages being send
to the client as vnc data, the pollfd becomes fd 2, only to be replaced
by /dev/null since a pollfd is not writable.

This commit fixes this by opening /dev/null directly after the close(2),
avoiding that the pollfd becomes fd 2.

Alan Coopersmith: Change to use dup2() for atomic switch of fd

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

ChangeWindowProperty() was removed upstream because it was redundant,
and dixChangeWindowProperty() has been around since 1.5 so we can
safely use that.

Use the new X server API as the reference system and emulate it on
the older API. Avoids a lot of code duplication.

Xvnc didn't handle multiple screens properly as it forgot to place
them without overlap and didn't handle cursor movement between them.

Pointer are global, not screen specific. Hence so is also the cursor
sprite.

The client is not aware of where the screen is placed so it will give
us screen relative coordinates. Convert to and from these and absolute
coordinates before interacting with the input layer.

It is possible to set pointer coordinate using absolute numbers, but
getting them back will always give us screen relative ones. Do the
necessary calculations manually so we return sane values to the caller.

Complie error on RHEL7 for missing depency libos.

It was previously controlled by vncconfig which had no restrictions,
so at least include the relevant settings in the default list of
overrides.

What to do when a socket is writeable should be handled in the
RFB core code as there may be other events we want to fire off
when this happens.

GetMaster() wasn't exported until Xorg 1.18 so it is unsafe to use
from libvnc.so for older versions.

xserver118.patch is identical to xserver117.patch by content.

Allows to specify which configuration parameters can be modified on runtime.