Re: Terminfo: 24-Bit/3-byte Color Support

[Thomas Dickey]

On Tue, Oct 15, 2013 at 02:07:01PM +0200, Rüdiger Sonderfeld wrote:
> On Tuesday 15 October 2013 06:50:14 Thomas Dickey wrote:
> > On Tue, Oct 15, 2013 at 12:06:26PM +0200, Rüdiger Sonderfeld wrote:
> > >     colors#16777216,
> > 
> > That won't work with terminfo, which uses signed 16-bit numbers.
> > 
> > If slang used ncurses' terminfo interface (it does not),
> > I might consider making an extension,
> > but I'd get too much interference from packagers to consider that.
> > 
> > Compatibility bites.
> 
> Changing terminfo to wider integers is probably not necessary.  This could be 
> treated completely as an extension when setrgbf/setrgbb are added.
> 
> > >     setrgbf=\E[38;2;#1%d;#2%d;#3%dm,
> > >     setrgbb=\E[48;2;#1%d;#2%d;#3%dm,
> > 
> > initc seems to do what's already needed - even for this item.
> 
> But initc is still limited to the 256 color index table.  Even if colors is 
> extended then it is limited to 32767 colors (signed 16-bit).

yes/no: initc doesn't care what its parameters are.  curses uses the 
information -
and it has public data structures for storing it.

Also, to know how to do its job, curses maintains a table with all of the color 
pairs.
Doesn't sound efficient (the few applications which I can see would use those
escape sequences would have a palette of only a few hundred choices - or they
would have the same problem in handling repaints of the screen).

-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

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