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[PATCH v3 3/4] Let user turn 24-bit terminal colors on.
From: |
Rami Ylimäki |
Subject: |
[PATCH v3 3/4] Let user turn 24-bit terminal colors on. |
Date: |
Tue, 14 Feb 2017 17:58:21 +0200 |
From: Rami Ylimäki <address@hidden>
ITU-T T.412 9.1.4 and ITU-T T.416 13.1.8 specify control function for
changing terminal foreground and background colors. One possible format
for the control function parameters is: 2:n:r:g:b, where 2 is color
access mode indicating direct RGB space, n is an indentifier that gives
detailed information about the color space and r, g, b are the color
values.
Most 24-bit terminals implement this function as 2;r;g;b. Color space
identifier has been omitted because of its complexity and rgb values are
assumed to be in range 0-255. Parameters are separated by semicolons
instead of colons for historical reasons.
The terminfo database supports only indexed color control functions and
can't be used to determine whether a terminal has implemented direct
color control functions.
However, this can be worked around by creating user defined functions
for setting 24-bit foreground and background colors. This can be done by
creating a terminfo source file with the required capabilities and
compiling a custom terminal type definition.
For example:
$ cat terminfo-24bit.src
# Replace semicolons with colons in setb24 and setf24 on terminals
# that use ITU-T separators (iTerm2). A 24-bit integer (p1) is given
# as a parameter to the control functions which calculate rgb
# component values with following formulas:
# r = p1 / 65536, g = (p1 / 256) & 255, b = p1 & 255
xterm-24bits|xterm with 16777216 colors,
use=xterm-256color,
setb24=\E[48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%dm,
setf24=\E[38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%dm,
$ tic -x -o ~/.terminfo terminfo-24bit.src
$ TERM=xterm-24bits emacs
* src/term.c (init_tty): Use 24-bit terminal colors if corresponding
foreground and background functions are present in terminal type
definition.
* src/tparam.h: Define prototype for tigetstr.
---
src/term.c | 14 ++++++++++++++
src/tparam.h | 4 ++++
2 files changed, 18 insertions(+)
diff --git a/src/term.c b/src/term.c
index b0ff9cb..35fa8c9 100644
--- a/src/term.c
+++ b/src/term.c
@@ -4131,6 +4131,20 @@ use the Bourne shell command 'TERM=...; export TERM'
(C-shell:\n\
tty->TN_max_colors = tgetnum ("Co");
+#ifdef TERMINFO
+ /* Non-standard support for 24-bit colors. */
+ {
+ const char* fg = tigetstr ("setf24");
+ const char* bg = tigetstr ("setb24");
+ if (fg && bg && fg != (char *)-1 && bg != (char *)-1)
+ {
+ tty->TS_set_foreground = fg;
+ tty->TS_set_background = bg;
+ tty->TN_max_colors = 16777216;
+ }
+ }
+#endif
+
tty->TN_no_color_video = tgetnum ("NC");
if (tty->TN_no_color_video == -1)
tty->TN_no_color_video = 0;
diff --git a/src/tparam.h b/src/tparam.h
index 15664d6..02136b6 100644
--- a/src/tparam.h
+++ b/src/tparam.h
@@ -36,4 +36,8 @@ extern char PC;
extern char *BC;
extern char *UP;
+#ifdef TERMINFO
+char *tigetstr(const char *);
+#endif
+
#endif /* EMACS_TPARAM_H */
--
2.7.4
- [PATCH v3 0/4] Support 24-bit terminal colors., Rami Ylimäki, 2017/02/14
- [PATCH v3 1/4] Remove unused terminal color pair count., Rami Ylimäki, 2017/02/14
- [PATCH v3 3/4] Let user turn 24-bit terminal colors on.,
Rami Ylimäki <=
- [PATCH v3 2/4] Support 24-bit terminal colors., Rami Ylimäki, 2017/02/14
- [PATCH v3 4/4] Update documentation regarding 24-bit TTY colors., Rami Ylimäki, 2017/02/14
- Re: [PATCH v3 0/4] Support 24-bit terminal colors., Eli Zaretskii, 2017/02/18
- Re: [PATCH v3 0/4] Support 24-bit terminal colors., Tino Calancha, 2017/02/18
- Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.), Kaushal Modi, 2017/02/18
- Re: Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.), Kaushal Modi, 2017/02/18
- Re: Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.), Tino Calancha, 2017/02/19
- Re: Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.), Kaushal Modi, 2017/02/19
- Re: Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.), Rami Ylimäki, 2017/02/19
- Re: Black and white emacs -nw (WAS: Re: [PATCH v3 0/4] Support 24-bit terminal colors.), Kaushal Modi, 2017/02/19