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+.\" $XFree86$
+.\"
+.\" Copyright 2004 Red Hat Inc., Durham, North Carolina.
+.\" All Rights Reserved.
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation on the rights to use, copy, modify, merge,
+.\" publish, distribute, sublicense, and/or sell copies of the Software,
+.\" and to permit persons to whom the Software is furnished to do so,
+.\" subject to the following conditions:
+.\"
+.\" he above copyright notice and this permission notice (including the
+.\" next paragraph) shall be included in all copies or substantial
+.\" portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+.\" NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+.\" BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+.\" ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+.\" CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+.\" SOFTWARE.
+.TH DMXGetWindowAttributes 3X __vendorversion__
+.SH NAME
+DMXGetWindowAttributes \- determine back-end window attributes
+.SH SYNOPSIS
+.B #include <X11/extensions/dmxext.h>
+.sp
+.nf
+.BI "Bool DMXGetWindowAttributes(Display " *dpy ,
+.BI "                            Window " window ,
+.BI "                            int " *screen_count ,
+.BI "                            int " available_count ,
+.BI "                            DMXWindowAttributes " *attr );
+.fi
+.SH DESCRIPTION
+When calling
+.BR DMXGetWindowAttributes() ,
+.I window
+specifies the window ID of a window on the
+.BR Xdmx (1)
+server and
+.I available_count
+specifies the length of
+.I attr.
+.PP
+The number of screens for which information is available will be
+returned in
+.I screen_count
+and information about those screen will be returned in
+.IR attr .
+If
+.I screen_count
+is less than
+.IR available_count ,
+then information for all of the screens will be returned.  Otherwise,
+information for the first
+.I available_count
+screens will be returned.
+.PP
+The
+.I DMXWindowAttributes
+structure is:
+.sp
+.nf
+typedef struct {
+    int          screen;
+    Window       window;
+    XRectangle   pos, vis;
+} DMXWindowAttributes;
+.fi
+.PP
+For each back-end X server that displays a portion of
+.IR window ,
+this structure contains the physical
+.I screen
+containing that portion, the
+.I window
+ID on the back-end X server of the window containing that portion, the
+position and dimensions of the window on the back-end
+.RI ( pos ,
+in screen coordinates), and the visible area of the window on the
+back-end
+.RI ( vis ,
+in window-relative coordinates -- all zeros if the window is not visible
+on the backend).
+.PP
+To obtain more information about the physical screen use the
+.BR DMXGetScreenAttributes (3X)
+call.
+.PP
+Note that DMX allows multiple back-end windows to overlap in their
+view of the DMX logical window.  Further, a logical window does not
+have to be completely covered by back-end windows -- there may be
+gaps.
+.PP
+As an example, consider a 500x500 window that spans the top two
+1024x768 back-end displays (A and B) of a 2048x1536 DMX display
+composed of 4 1024x768 back-end displays arranged in a cube:
+.sp
+.nf
+    A B
+    C D
+.fi
+.sp
+In this case, the DMXGetWindowAttributes call would return the
+following information for the 500x500 window:
+.sp
+.nf
+display A: 500x500 window at 1024-250,0 (relative to back end)
+           with 250x500 visible at 0,0 (relative to window origin)
+
+display B: 500x500 window at -250,0 (relative to back end)
+           with 250x500 visible at 250,0 (relative to window origin)
+
+display C: 500x500 window at 1024-250,-768 with 0x0 visible at 0,0
+
+display D: 500x500 window at -250,-768 with 0x0 visible at 0,0
+.fi
+.SH "RETURN VALUE"
+.B DMXGetWindowAttributes()
+returns
+.B True
+unless there is a protocol error.
+.PP
+.B DMXGetWindowAttributes()
+can generate
+.B BadWindow
+and
+.B BadAlloc
+errors.
+.SH NOTES
+Because this call transports a great deal of information over the wire,
+please call
+.BR DMXGetScreenCount (3X)
+first, and make sure
+.I attr
+is sufficiently large.
+.PP
+On a particular back-end server, it is possible that the associated
+window has not yet been mapped because the
+.BR XMapWindow (3X)
+call that will eventually map the window had been buffered by Xlib's
+normal buffering system.  To avoid this race condition, please call
+.BR DMXSync (3X)
+before communicating directly with the back-end X server.
+.SH "SEE ALSO"
+.BR DMXGetScreenCount "(3X), "
+.BR DMXSync "(3X), "
+.BR DMXGetScreenAttributes "(3X), "
+.BR DMX "(3X), " Xdmx (1)