[GRASS5] Color code cleanup

[Glynn Clements]

Cedric Shock wrote:

> Display code might want to tack on another indexed color for the non-standard 
> color table. This does avoid lookup of RGB value in a table on an indexed 
> display, right? Setting colors seems to be being done fairly infrequently so 
> this probably isn't a big performance concern.
> 
> Is there any R_ protocol command for none. Something that just turns off 
> drawing until another color gets set?

No.

The notion of "none" is only applicable to the raster operations,
where index zero can optionally indicate transparent (used by e.g. 
"d.rast -o ...").

-- 
Glynn Clements <glynn at gclements.plus.com>