writem(3G)writem(3G)NAMEwritem - grants write permission to bitplanes
FORTRAN 77 SPECIFICATION
subroutine writem(wtm)
integer*4 wtm
PARAMETERS
wtm expects a mask whose bits control which bitplanes are available for
drawing and which are read only.
The mask contains one bit per available bitplane. If a bit is set
in the writemask, the system writes the current color index into
the corresponding bitplane. If a bit is set to zero in the
writemask, the corresponding bitplane is read-only.
DESCRIPTION
Use writem to reserve bitplanes for special purposes. When the writemask
marks a bitplane as read-only, that bitplane is write protected from
ordinary drawing routines.
Use RGBwri in RGB mode.
SEE ALSO
color, drawmo, RGBwri
BUGSwritem does not work properly on the IRIS-4D VGX, VGXT and SKYWRITER
models when the current drawmode is not NORMDR.
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