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       display-file - Render display into image file


       display-file: [-flushcmd=<command>] [-flushframe=<n>]
                     [-flushtime=<t>] <filename>


       Renders  an  image  into  a file.  The file can be a framebuffer device
       (e.g. /dev/fb0), in which case a reasonable representation of the image
       will  be drawn on the console so long as the program’s mode matches the
       framebuffer’s mode.
              Note: This target  generates  no  input.   The  display-multi(7)
              target  can  be  used  in  order  to  see (and control) what the
              program does  (using  a  normal  target)  and  then  generate  a
              snapshot when the program exits.


       filename is the file to render the images to.  If the filename is a PPM
       file (has the extension .ppm), then the  image  will  be  generated  at
       ggiClose(3) time.  Otherwise the file is a custom GGIFILE format and is
       generated continuously.

       The display-file target can be used to  generate  movies  from  running
       LibGGI  applications.  To  do this, set -flushcmd to a shell command to
       execute at the times given by one of the  two  other  parameters.  This
       looks typically like:

       ppmtogif foo.ppm > foo.%04d.gif

       The  command  is passed through a printf(3) which has the current count
       of saved frames as an argument (or rather as 10 arguments  to  allow  a
       few more complex commands).

       This  shell  command  is  either  executed  at every n-th invocation of
       ggiFlush or every t seconds, where t  can  have  fractional  components
       (specified as decimal).

       Note,  that  the  invocation  of  the  shell command will slow down the
       program, so make sure you use  a  reasonable  value,  if  you  use  the
       -flushtime argument.

       The  primary  file  is  updated  before  every  invocation of the shell


       ·   DirectBuffer always available.

       ·   Unaccelerated.