| 
            plsmem
          ( | maxx , | 
| maxy , | |
| plotmem ); | 
      Set the memory area to be plotted (with the “mem” or
      “memcairo” driver)
      as the dev member of the stream structure.  Also
      set the number of pixels in the memory passed in
      plotmem, which is a block of memory
      maxy by maxx by 3 bytes
      long, say: 480 x 640 x 3 (Y, X, RGB)
    
This memory will have to be freed by the user!
      Redacted form: plsmem(maxx, maxy, plotmem)
    
This function is not used in any examples.