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       display-tile - Divide display into tiles similar to a video wall


       display-tile : [ [-usedb] | [-nodb] ]


       Emulates  one  big  target,  where  one  or  more  areas  are mapped to
       different child visuals.


       For each tile (i.e. child visual or mapped area), the following must be

       offset-x, offset-y
              coordinates (within the parent visual) of the top-left corner of
              the child visual

       size-x, size-y
              width and height of the child visual

              a target spec.  Since target specs can (and  often  do)  contain
              colons, it needs to be enclosed in parentheses.

       The following options apply to the whole display-tile:

       -usedb Enables DirectBuffer emulation. This is the default mode.

              The   contents   of   each  mapped  area  is  blitted  from  the
              DirectBuffer into their  respective  child  visuals  at  regular
              intervals or when the visual is flushed.  DirectBuffer emulation
              works  regardless  of  whether   the   child   visuals   support
              DirectBuffer or not.

       -nodb  Disables  DirectBuffer  emulation.  LibGGI primitives are passed
              to each of the child visuals with  the  necessary  clipping  and
              translation.   Thus,  if a child visual underlying a mapped area
              supports acceleration, then the operation on that area  will  be


       ·   DirectBuffer support depends on the -usedb and -nodb options.

       ·   Accelerated  in  no-DB  mode if the underlying target is, otherwise

              Tip: display-tile  can  be  used  to  emulate  DirectBuffer  for
              obstinate applications that cannot run without it, by specifying
              one tile which maps the whole screen.