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       DMXGetScreenAttributes - determine back-end screen attributes


       #include <X11/extensions/dmxext.h>

       Bool DMXGetScreenAttributes(Display *dpy,
                                   int screen,
                                   DMXScreenAttributes *attr);


       DMXGetScreenAttributes()  returns  the  attributes  for  the single DMX
       screen specified in screen.

       The DMXScreenAttributes structure is:

       typedef struct {
           char         *displayName;
           int          logicalScreen;

           unsigned int screenWindowWidth;
           unsigned int screenWindowHeight;
           int          screenWindowXoffset;
           int          screenWindowYoffset;

           unsigned int rootWindowWidth;
           unsigned int rootWindowHeight;
           int          rootWindowXoffset;
           int          rootWindowYoffset;

           int          rootWindowXorigin;
           int          rootWindowYorigin;
       } DMXScreenAttributes;

       displayName is the name used to  open  the  display,  either  from  the
       Xdmx(1) command-line or from the configuration file.

       logicalScreen  is  the  value  of  the  screen that that Xdmx(1) server
       exports to clients.  When Xinerama is in use, this value is typically 0
       for   all   values   of   physicalScreen.    If  Xinerama  is  in  use,
       rootWindowXorigin and  rootWindowYorigin  specify  where  the  physical
       screen   is  positioned  in  the  global  Xinerama  coordinate  system.
       Otherwise, these values are set to 0.

       screenWindowWidth,   screenWindowHeight,    screenWindowXoffset,    and
       screenWindowYoffset  are  a  geometry specification (see X(7x)) for the
       location of the DMX screen on  the  back-end  screen.   The  coordinant
       system of the back-end display is used for these values.

       rootWindowWidth,      rootWindowHeight,      rootWindowXoffset,     and
       rootWindowYoffset are a geometry  specification  (see  X(7x))  for  the
       location  of  the  root  window  on  the screen window.  The coordinant
       system of the screen window is used.  In most cases,  the  root  window
       will  have  the same geometry as the DMX screen window, and will occupy
       the same area of the back-end display.  (This would not  be  the  case,
       for example, if automatic projector alignment is used.)


       DMXGetScreenAttributes() returns True unless there is a protocol error.

       DMXGetScreenAttributes() can generate BadValue errors.


       DMXGetScreenCount(3), DMXChangeScreenAttributes(3), DMX(3), Xdmx(1)