rgbwritem(3g) — 4D1 2.0



     RGBwritemask(3G)                                 RGBwritemask(3G)



     NAME

          RGBwritemask - grants write access to a subset of the

          available bitplanes


     SPECIFICATION

          C         RGBwritemask(red, green, blue)

                    short red, green, blue;




          FORTRAN   subroutine RGBwri(red, green, blue)

                    integer*4 red, green, blue


     DESCRIPTION

          RGBwritemask shields bitplanes that are not used for

          ordinary drawing routines in RGB mode.  red, green, blue are

          masks for each of the three sets of bitplanes.  Wherever the

          digit 1 is in the writemask, the system writes the

          corresponding bits in the RGB color into the bitplanes.

          Zeros in the writemask mark bitplanes as read-only.  These

          bitplanes are not changed, regardless of the bits in the RGB

          color.


     SEE ALSO

          gRGBmask, RGBcolor, writemask


          Programming Guide, Section 6.7, Writemasks





























     Page 1                                          (printed 8/20/87)
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