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Use expected escape sequence for terminfo Tc and COLORTERM=truecolor

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When the non-standard terminfo capability Tc is present, or the
environment variable COLORTERM is set to truecolor, use a
hard-coded escape sequence that addresses all colors directly by
their RGB values.

Previously we used escape sequences cribbed from terminfo's
setaf/setab for direct color, that expect that we will only try to
use colors 000000 to 000007 for the first eight indexed colors.
This isn't something we currently handle.

* doc/misc/efaq.texi (Colors on a TTY): Fix off-by-one error in list
of indexed colors for terminfo RGB terminals.
* src/term.c (init_tty): Don’t use any indexed colors with terminfo
Tc capability or COLORTERM=truecolor environment variable (bug#70941).
This commit is contained in:
Peter Oliver 2026-04-05 00:24:33 +01:00 committed by Eli Zaretskii
parent 4e165cc2d0
commit 84ae97f865
2 changed files with 12 additions and 6 deletions
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2
doc/misc/efaq.texi
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@ -1973,7 +1973,7 @@ If Terminfo database is not available, but 24-bit direct color mode is
supported, it can still be enabled by defining the environment
variable @env{COLORTERM} to @samp{truecolor}.
Terminals with @samp{RGB} capability treat pixels #000001 - #000007 as
Terminals with @samp{RGB} capability treat pixels #000000 - #000007 as
indexed colors to maintain backward compatibility with applications
that are unaware of direct color mode. Therefore the seven darkest
blue shades may not be available. If this is a problem, you can

16
src/term.c
View file

@ -4605,16 +4605,22 @@ use the Bourne shell command 'TERM=...; export TERM' (C-shell:\n\
signed values, tgetnum("Co") and tigetnum("colors")
could return 32767. */
tty->TN_max_colors = 16777216;
/* FIXME: When the RGB terminfo capability is given, we
should avoid trying to use colors 000000 to 000007 as if
they were RGB values. The escape sequences given by
setaf and setab treat them as the first eight indexed
ANSI colors. */
}
/* Fall back to xterm+direct (semicolon version) if Tc is set
(de-facto standard introduced by tmux) or if requested by
the COLORTERM environment variable. */
/* Fall back to direct colour by RGB value (semicolon version)
if Tc is set (de-facto standard introduced by tmux) or if
requested by the COLORTERM environment variable. */
else if ((tigetflag ("Tc") > 0)
|| ((bg = getenv ("COLORTERM")) != NULL
&& strcasecmp (bg, "truecolor") == 0))
{
tty->TS_set_foreground = "\033[%?%p1%{8}%<%t3%p1%d%e38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
tty->TS_set_background = "\033[%?%p1%{8}%<%t4%p1%d%e48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
tty->TS_set_foreground = "\033[38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
tty->TS_set_background = "\033[48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
tty->TN_max_colors = 16777216;
}
}