Function:     GDI_GRREAD

Purpose:      Gets the graphics data.

Category:     DISPLAY

File:         gdilib.c

Author:       K.G. Begeman

Use:          INTEGER GDI_GRREAD( GDI_ID ,     Input     INTEGER
                                  DATA ,       Input     INTEGER ARRAY
                                  NDATA ,      Input	INTEGER
                                  PACKED )     Input     INTEGER

              GDI_GRREAD     Returns zero on success, negative on error.
              GDI_ID         Id of display.
              DATA           Array containing graphics data packed
                             according to the PACKED code.
              NDATA          Number of graphics data packed into DATA.
              PACKED         Number of graphics data per integer.
                             The least significant part of the
                             integer contains the most left graphics
                             datum. A value of zero means that
                             DATA contains plain bytes.

Updates:      Jan  3, 1991: KGB Document created.