DMXGetWindowAttributes man page on aLinux

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DMXGetWindowAttributes(3)			     DMXGetWindowAttributes(3)

NAME
       DMXGetWindowAttributes - determine back-end window attributes

SYNOPSIS
       #include <X11/extensions/dmxext.h>

       Bool DMXGetWindowAttributes(Display *dpy,
				   Window window,
				   int *screen_count,
				   int available_count,
				   DMXWindowAttributes *attr);

DESCRIPTION
       When  calling  DMXGetWindowAttributes(), window specifies the window ID
       of a window on the Xdmx(1) server  and  available_count	specifies  the
       length of attr.

       The  number  of	screens	 for  which  information  is available will be
       returned in screen_count and information about  those  screen  will  be
       returned	 in  attr.  If screen_count is less than available_count, then
       information for all of the screens will be returned.  Otherwise, infor‐
       mation for the first available_count screens will be returned.

       The DMXWindowAttributes structure is:

       typedef struct {
	   int		screen;
	   Window	window;
	   XRectangle	pos, vis;
       } DMXWindowAttributes;

       For  each  back-end  X  server  that displays a portion of window, this
       structure contains the physical screen  containing  that	 portion,  the
       window  ID  on the back-end X server of the window containing that por‐
       tion, the position and dimensions of the window on the  back-end	 (pos,
       in screen coordinates), and the visible area of the window on the back-
       end (vis, in window-relative coordinates -- all zeros if the window  is
       not visible on the backend).

       To   obtain   more  information	about  the  physical  screen  use  the
       DMXGetScreenAttributes(3) call.

       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.

       As an example, consider	a  500x500  window  that  spans	 the  top  two
       1024x768	 back-end  displays  (A and B) of a 2048x1536 DMX display com‐
       posed of 4 1024x768 back-end displays arranged in a cube:

	   A B
	   C D

       In this case, the DMXGetWindowAttributes call would return the  follow‐
       ing information for the 500x500 window:

       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

RETURN VALUE
       DMXGetWindowAttributes() returns True unless there is a protocol error.

       DMXGetWindowAttributes() can generate BadWindow and BadAlloc errors.

NOTES
       Because this call transports a great deal of information over the wire,
       please call DMXGetScreenCount(3) first, and make sure  attr  is	suffi‐
       ciently large.

       On  a  particular  back-end  server, it is possible that the associated
       window has not yet been mapped because the XMapWindow(3) call that will
       eventually  map the window had been buffered by Xlib's normal buffering
       system.	To avoid this race condition, please  call  DMXSync(3)	before
       communicating directly with the back-end X server.

SEE ALSO
       DMXGetScreenCount(3),  DMXSync(3),  DMXGetScreenAttributes(3),  DMX(3),
       Xdmx(1)

X Version 11			 libdmx 1.0.2	     DMXGetWindowAttributes(3)
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