NAME

       X11::Protocol::Ext::XINERAMA - multi-monitor display information

SYNOPSIS

        use X11::Protocol;
        my $X = X11::Protocol->new;
        $X->init_extension('XINERAMA')
          or print "XINERAMA extension not available";

DESCRIPTION

       Xinerama puts together two or more physical monitors to make a single large screen.  The XINERAMA
       extension allows clients to enquire about the setup.

       The 1.0 "PanoramiX" requests take a $window parameter apparently to allow for more than one X screen made
       up of multiple physical monitors, but in practice the servers have only made one screen this way and the
       1.1 "Xinerama" requests don't have that.

       See examples/xinerama-info.pl for a sample program dumping the Xinerama state information.

REQUESTS

       The following requests are made available with an "init_extension()" per "EXTENSIONS" in X11::Protocol.

           my $bool = $X->init_extension('XINERAMA');

   Xinerama 1.0
       "($server_major, $server_minor) = $X->PanoramiXQueryVersion ($client_major, $client_minor)"
           Negotiate a protocol version with the server.  $client_major and $client_minor is what the client
           would like, the returned $server_major and $server_minor is what the server will do, which might be
           less than requested (but not more).

           The current code in this module supports up to 1.1.  The intention would be to automatically
           negotiate within "init_extension()" if/when necessary,

       "$flag = $X->PanoramiXGetState ($window)"
           Return non-zero if Xinerama is active on the screen of $window (an XID).

       "$count = $X->PanoramiXGetScreenCount ($window)"
           Return the number of physical monitors on the screen of $window (an XID).

       "($width, $height) = $X->PanoramiXGetScreenSize ($window, $monitor)"
           Return the size in pixels of physical monitor number $monitor (integer, 0 for the first monitor) on
           the screen of $window (an XID).

   Xinerama 1.1
       "$bool = $X->XineramaIsActive ()"
           Return non-zero if Xinerama is active on the $X server.

       "@rectangles = $X->XineramaQueryScreens ()"
           Return the rectangular areas made up by the physical monitors.  The return is a list of arrayrefs,

               [ $x,$y, $width,$height ]

           $x,$y is the top-left corner of the monitor in the combined screen.

BUGS

   "Xsun"
       Rumour has it the "Xsun" server with Xinerama 1.0 had a different request number 4 than the
       "XineramaIsActive" of Xinerama 1.1 above.

           <http://blogs.sun.com/alanc/entry/xinerama_protocol_clashes_on_solaris>

       There's no attempt to do anything about this here, as yet.  If "PanoramiXQueryVersion()" reports 1.0 then
       you shouldn't use "XineramaIsActive()" anyway, so no clash.  If you do and it's the "Xsun" server then
       expect either a Length error reply, or the server to adapt itself to the request length and behave as
       "XineramaIsActive".

   "PanoramiXGetScreenSize()" Buffer Overrun
       Early server code such as X11R6.4 might not range check the monitor number in "PanoramiXGetScreenSize()".
       Did big values read out fragments of arbitrary memory, or cause a segfault?  Don't do that.

           X.org some time post 1.5.x, "Prevent buffer overrun in ProcPanoramiXGetScreenSize",
           <http://cgit.freedesktop.org/xorg/xserver/commit/?id=2b266eda6e23d16116f8a8e258192df353970279>

OTHER NOTES

       To simulate some Xinerama for testing the "Xdmx" server can multiplex together two or more other servers
       to present one big screen.  Those sub-servers can even be "Xnest" or "Xephyr" windows on an existing X
       display.  For example running up "Xdmx" as display ":102",

           Xephyr :5 -screen 200x100 &
           Xephyr :6 -screen 190x110 &
           sleep 1
           Xdmx -display :5 -display :6 +xinerama -input :5 -input :6 :102

       "Xephyr" implements some extensions natively, whereas "Xnest" relies on the target server capabilities.
       Or to run up without bothering to look at anything "Xvfb" in memory or a disk file.

SEE ALSO

       X11::Protocol

       Initial technical details "http://www.kernel.org/doc/als1999/Conference/IMcCartney/xinerama.html"

HOME PAGE

       <http://user42.tuxfamily.org/x11-protocol-other/index.html>

LICENSE

       Copyright 2011, 2012, 2013, 2014, 2017 Kevin Ryde

       X11-Protocol-Other is free software; you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation; either version 3, or (at your
       option) any later version.

       X11-Protocol-Other is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
       even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
       Public License for more details.

       You should have received a copy of the GNU General Public License along with X11-Protocol-Other.  If not,
       see <http://www.gnu.org/licenses/>.