- Subject: [slang-users] Fwd: True Color (24 bit color) escape sequences support
- From: Антон Кочков <anton.kochkov@xxxxxxxxx>
- Date: Fri, 21 Aug 2015 19:50:40 +0300
Good day!
Since there was no answer to my previous message and to this day
support of the TrueColor is wide, I'm sending the new message to this
mailing list, asking to support those 24bit color escape sequences.
Here is the short summary about the current state of the support in
various terminals and programs:
( from this gist - https://gist.github.com/XVilka/8346728 )
Also attaching the patch (not my) for slang to support that.
------------------------------------
It's a common confusion about terminal colors... Actually we have this:
plain ascii
ansi escape codes (16 color codes with bold/italic and background)
256 color palette (216 colors + 16 gray + ansi) (colors are 24bit)
24bit true color ("888" colors (aka 16 milion))
printf "\x1b[${bg};2;${red};${green};${blue}m\n"
The 256 color palete is configured at start, and it's a 666 cube of
colors, each of them defined as a 24bit (888 rgb) color.
This means that current support can only display 256 different colors
in the terminal, while truecolor means that you can display 16 milion
different colors at the same time.
Truecolor escape codes doesnt uses a color palete. It just specifies
the color itself.
Here's a test case:
printf "\x1b[38;2;255;100;0mTRUECOLOR\x1b[0m\n"
or http://github.com/robertknight/konsole/tree/master/tests/color-spaces.pl
or https://git.gnome.org/browse/vte/tree/perf/img.sh?h=vte-0-36
Keep in mind that it is possible to use both ';' and ':' as parameters
delimiter.
According to Wikipedia[1], this is only supported by xterm and konsole.
[1] https://en.wikipedia.org/wiki/ANSI_color
Currently, there is no support for the 24-bit color descriptions in
the terminfo/termcap database and utilites. See the discussion thread
here: https://lists.gnu.org/archive/html/bug-ncurses/2013-10/msg00007.html
Here are terminals discussions:
Now supporting truecolor
st (from suckless) [delimeter: semicolon] -
http://lists.suckless.org/dev/1307/16688.html
konsole [delimeter: colon, semicolon] -
https://bugs.kde.org/show_bug.cgi?id=107487
iterm2 [delimeter: colon, semicolon] - only in the nighties
https://code.google.com/p/iterm2/issues/detail?id=218
qterminal [delimeter: semicolon] -
https://github.com/qterminal/qterminal/issues/78
Tera Term [delimeter: colon, semicolon] - Windows platform
ConEmu [delimeter: semicolon] - Windows platform
FinalTerm [delimeter: semicolon] - abandoned, iTerm2 borrowing it's
ideas and features.
mintty [delimeter: semicolon] Cygwin and MSYS/MSYS2 since commit
https://github.com/mintty/mintty/commit/43f0ed8a46c6549cb9a3ea27abc057b5abe13bdb
(2.0.1 release) - Windows platform
all libvte based terminals (since 0.36 version) [delimeter: colon,
semilocon] - https://bugzilla.gnome.org/show_bug.cgi?id=704449
libvte-based Gnome Terminal
libvte-based sakura
libvte-based Terminator - use GTK+3 version.
libvte-based Lilyterm - since commit
https://github.com/Tetralet/LilyTerm/commit/72536e7ba448ad9ef1126ce45fbde3a3407a271b
libvte-based ROXTerm
libvte-based evilvte - no release yet, version from git
https://github.com/caleb-/evilvte
libvte-based Termit
libvte-based Termite
libvte-based Tilda
libvte-based tinyterm
libvte-based lxterminal - with --enable-gtk3 configure flag.
libvte-based mlterm - with --with-gtk=3.0 configure flag
But there are bunch of libvte-based terminals for GTK2 so they are
listed in the another section.
Parsing ANSI color sequences, but approximating them to 256 palette
xterm (though doing it wrong: "it uses nearest colour in RGB colour
space, with a usualfalse assumption about orthogonal axes")
Note about colour differences: a) RGB axes are not orthogonal, so you
cannot use sqrt(R^2+G^2+B^2) formula, b) for colour differences there
is more correct (but much more complex) CIEDE2000 formula (which may
easily blow up performance if used blindly) [2].
[2] https://github.com/neovim/neovim/issues/793#issuecomment-48106948
NOT supporting truecolor
urxvt (patched version [3] available) -
http://lists.schmorp.de/pipermail/rxvt-unicode/2013q3/001826.html
Terminology (E17) - https://phab.enlightenment.org/T746
mrxvt (looks abandoned) - https://sourceforge.net/p/materm/feature-requests/41/
aterm (looks abandoned) - https://sourceforge.net/p/aterm/feature-requests/23/
fbcon (from linux kernel) - https://bugzilla.kernel.org/show_bug.cgi?id=79551
FreeBSD console - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191652
PuTTY (patched version [4] {xterm-like approximation to 256 colors}
and [5] {real true colors} available) - Windows platform
libvte and GTK2 - based:
libvte-based GTKTerm2
libvte-based stjerm - https://github.com/stjerm/stjerm/issues/39
libvte-based xfce4-terminal - will be solved automatically since Xfce
slowly migrating to the GTK+3
[3] You can download patched version here
https://github.com/spudowiar/rxvt-unicode/tree/24bit
[4] You can download patched version here https://github.com/rdebath/PuTTY
[5] You can download patched version here https://github.com/halcy/PuTTY
Terminal multiplexers
tmux (have workaround[6] and patches[7] and [8]) -
https://github.com/tmux/tmux/issues/34 Older:
https://sourceforge.net/p/tmux/tickets/140/ and
https://www.mail-archive.com/tmux-users@xxxxxxxxxxxxxxxxxxxxx/msg04720.html
screen
[6] Currently you can use tmux_escape option as a workaround if you
want true color in shell run under tmux. No true color in tmux
statusline though.
[7] You can see the patch here
https://gist.github.com/JohnMorales/0579990993f6dec19e83
[8] And here is the more recent patch
https://gist.github.com/zchee/9f6f2ca17acf49e04088
Here are another console programs discussions:
Supporting True Color:
irssi - https://github.com/irssi/irssi/pull/48
neovim - https://github.com/neovim/neovim/commit/8dd415e887923f99ab5daaeba9f0303e173dd1aa
elinks - http://repo.or.cz/w/elinks.git/blob/HEAD:/configure.in#l1410
(./configure --enable-true-color)
Not supporting True Color:
mutt - http://dev.mutt.org/trac/ticket/3674
mc - http://www.midnight-commander.org/ticket/3145#comment:1 - demo
patches attached
s-lang library - http://lists.jedsoft.org/lists/slang-users/2014/0000002.html
ncurses library -
https://lists.gnu.org/archive/html/bug-ncurses/2013-10/msg00007.html
termbox library - https://github.com/nsf/termbox/issues/37
mcabber - https://bitbucket.org/McKael/mcabber-crew/issue/126/support-for-true-color-16-millions-colors
emacs - http://emacs.1067599.n5.nabble.com/RFC-Add-tty-True-Color-support-td299962.html
and http://emacs.1067599.n5.nabble.com/bug-20243-True-color-terminal-support-tc354040.html
vim - https://bitbucket.org/ZyX_I/vim/commits/branch/24-bit-xterm
tig - https://github.com/jonas/tig/issues/227
Best regards,
Anton Kochkov.
diff -ur slang-pre2.3.0-110.orig/src/slang.h slang-pre2.3.0-110/src/slang.h
--- slang-pre2.3.0-110.orig/src/slang.h 2013-12-26 10:42:03.000000000 +0100
+++ slang-pre2.3.0-110/src/slang.h 2014-01-16 00:45:11.001003762 +0100
@@ -1652,14 +1652,14 @@
SL_EXTERN unsigned long SLtt_Num_Chars_Output;
SL_EXTERN int SLtt_Baud_Rate;
-typedef unsigned long SLtt_Char_Type;
+typedef unsigned long long SLtt_Char_Type;
-#define SLTT_BOLD_MASK 0x01000000UL
-#define SLTT_BLINK_MASK 0x02000000UL
-#define SLTT_ULINE_MASK 0x04000000UL
-#define SLTT_REV_MASK 0x08000000UL
-#define SLTT_ALTC_MASK 0x10000000UL
-#define SLTT_ITALIC_MASK 0x20000000UL
+#define SLTT_BOLD_MASK 0x0000000001000000ULL
+#define SLTT_BLINK_MASK 0x0000000002000000ULL
+#define SLTT_ULINE_MASK 0x0000000004000000ULL
+#define SLTT_REV_MASK 0x0000000008000000ULL
+#define SLTT_ALTC_MASK 0x0000000010000000ULL
+#define SLTT_ITALIC_MASK 0x0000000020000000ULL
SL_EXTERN int SLtt_Screen_Rows;
SL_EXTERN int SLtt_Screen_Cols;
diff -ur slang-pre2.3.0-110.orig/src/sldisply.c slang-pre2.3.0-110/src/sldisply.c
--- slang-pre2.3.0-110.orig/src/sldisply.c 2013-09-13 10:42:03.000000000 +0200
+++ slang-pre2.3.0-110/src/sldisply.c 2014-01-16 01:02:49.289047637 +0100
@@ -89,21 +89,44 @@
/* Colors: These definitions are used for the display. However, the
* application only uses object handles which get mapped to this
* internal representation. The mapping is performed by the Color_Map
- * structure below. */
+ * structure below.
+ *
+ * Colors are encoded in 25 bits as follows:
+ * - Values 0-255 for standard palette
+ * - 256 for terminal's default color
+ * - 0x1RRGGBB for true colors
+ *
+ * The bits are split so we can maintain ABI compatibility on 64 bit machines.
+ */
-#define CHAR_MASK 0x000000FF
-#define FG_MASK 0x0000FF00
-#define BG_MASK 0x00FF0000
-#define ATTR_MASK 0x3F000000
-#define BGALL_MASK 0x0FFF0000
+// FIXME: are the CHAR_MASK bits used at all? If not then the color bits can be
+// spread out a little bit more nicely, see the #else branch.
+#if 1
+
+#define CHAR_MASK 0x00000000000000FFULL
+#define FG_MASK_LOW 0x0000000000FFFF00ULL
+#define FG_MASK_HIGH 0x0000007FC0000000ULL
+#define BG_MASK 0xFFFFFF8000000000ULL
+#define ATTR_MASK 0x000000003F000000ULL
+#define CHAR_INVALID 0x4000000000000000ULL
+
+#define GET_FG(fgbg) ((((fgbg) & FG_MASK_HIGH) >> 14) | (((fgbg) & FG_MASK_LOW) >> 8))
+#define GET_BG(fgbg) (((fgbg) & BG_MASK) >> 39)
+#define MAKE_COLOR(fg, bg) ((((fg) << 14) & FG_MASK_HIGH) | (((fg) << 8) & FG_MASK_LOW) | (((bg) << 39) & BG_MASK))
-/* The 0x10000000 bit represents the alternate character set. BGALL_MASK does
- * not include this attribute.
- */
+#else
-#define GET_FG(fgbg) (((fgbg) & FG_MASK) >> 8)
-#define GET_BG(fgbg) (((fgbg) & BG_MASK) >> 16)
-#define MAKE_COLOR(fg, bg) (((fg) | ((bg) << 8)) << 8)
+#define FG_MASK_LOW 0x0000000000FFFFFFULL
+#define FG_MASK_HIGH 0x0200000000000000ULL
+#define BG_MASK 0x01FFFFFF00000000ULL
+#define ATTR_MASK 0x000000003F000000ULL
+#define CHAR_INVALID 0xFFFFFFFFFFFFFFFFULL
+
+#define GET_FG(fgbg) ((((fgbg) & FG_MASK_HIGH) >> 33) | ((fgbg) & FG_MASK_LOW))
+#define GET_BG(fgbg) (((fgbg) & BG_MASK) >> 32)
+#define MAKE_COLOR(fg, bg) ((((fg) << 33) & FG_MASK_HIGH) | ((fg) & FG_MASK_LOW) | (((bg) << 32) & BG_MASK))
+
+#endif
int SLtt_Screen_Cols = 80;
int SLtt_Screen_Rows = 24;
@@ -180,6 +203,8 @@
static SLCONST char *Color_Fg_Str = "\033[3%dm";
static SLCONST char *Color_Bg_Str = "\033[4%dm";
+static SLCONST char *Color_RGB_Fg_Str = "\033[38;2;%d;%d;%dm";
+static SLCONST char *Color_RGB_Bg_Str = "\033[48;2;%d;%d;%dm";
static SLCONST char *Default_Color_Fg_Str = "\033[39m";
static SLCONST char *Default_Color_Bg_Str = "\033[49m";
@@ -247,7 +272,7 @@
static int Cursor_r, Cursor_c; /* 0 based */
/* current attributes --- initialized to impossible value */
-static SLtt_Char_Type Current_Fgbg = 0xFFFFFFFFU;
+static SLtt_Char_Type Current_Fgbg = CHAR_INVALID;
static int Cursor_Set; /* 1 if cursor position known, 0
* if not. -1 if only row is known
@@ -1045,7 +1070,7 @@
}
if ((Del_Eol_Str != NULL)
- && (Can_Background_Color_Erase || ((Current_Fgbg & ~0xFFU) == 0)))
+ && (Can_Background_Color_Erase || ((Current_Fgbg & ~0xFFU) == 0))) // FIXME: do we use CHAR_MASK's bits here?
{
tt_write_string(Del_Eol_Str);
return;
@@ -1062,7 +1087,7 @@
void SLtt_del_eol (void)
{
- if (Current_Fgbg != 0xFFFFFFFFU) SLtt_normal_video ();
+ if (Current_Fgbg != CHAR_INVALID) SLtt_normal_video ();
del_eol ();
}
@@ -1092,7 +1117,7 @@
{"brightmagenta", SLSMG_COLOR_BRIGHT_CYAN},
{"brightcyan", SLSMG_COLOR_BRIGHT_MAGENTA},
{"white", SLSMG_COLOR_BRIGHT_WHITE},
-#define SLSMG_COLOR_DEFAULT 0xFF
+#define SLSMG_COLOR_DEFAULT 0x100
{"default", SLSMG_COLOR_DEFAULT}
};
@@ -1150,7 +1175,7 @@
Brush_Info_Type *b;
if (NULL == (b = get_brush_info (color)))
- return (SLtt_Char_Type)-1;
+ return CHAR_INVALID;
if (SLtt_Use_Ansi_Colors)
return b->fgbg;
@@ -1307,9 +1332,9 @@
if (Max_Terminfo_Colors != 8)
{
- if (f != SLSMG_COLOR_DEFAULT) f %= Max_Terminfo_Colors;
- if (b != SLSMG_COLOR_DEFAULT) b %= Max_Terminfo_Colors;
- return ((f << 8) | (b << 16));
+ if (f != SLSMG_COLOR_DEFAULT && !(f & (1 << 24))) f %= Max_Terminfo_Colors;
+ if (b != SLSMG_COLOR_DEFAULT && !(b & (1 << 24))) b %= Max_Terminfo_Colors;
+ return MAKE_COLOR(f,b);
}
/* Otherwise we have 8 ansi colors. Try to get bright versions
@@ -1331,7 +1356,15 @@
b &= 0x7;
}
- return ((f << 8) | (b << 16) | attr);
+ return MAKE_COLOR(f,b) | attr;
+}
+
+static int parse_hex_digit (char ch)
+{
+ if ('0' <= ch && ch <= '9') return ch - '0';
+ if ('A' <= ch && ch <= 'F') return 10 + ch - 'A';
+ if ('a' <= ch && ch <= 'f') return 10 + ch - 'a';
+ return -1;
}
/* This looks for colors with name form 'colorN'. If color is of this
@@ -1342,6 +1375,27 @@
unsigned int i;
unsigned char ch;
+ if (color[0] == '#')
+ {
+ int h[6];
+ SLtt_Char_Type rgb;
+ color++;
+ if (strlen(color) != 3 && strlen(color) != 6)
+ return -1;
+ for (i = 0; color[i] != '\0'; i++)
+ {
+ h[i] = parse_hex_digit (color[i]);
+ if (h[i] == -1)
+ return -1;
+ }
+ if (i == 3)
+ rgb = (h[0] << 20) | (h[0] << 16) | (h[1] << 12) | (h[1] << 8) | (h[2] << 4) | h[2];
+ else
+ rgb = (h[0] << 20) | (h[1] << 16) | (h[2] << 12) | (h[3] << 8) | (h[4] << 4) | h[5];
+ *f = (1 << 24) | rgb;
+ return 0;
+ }
+
if (strncmp (color, "color", 5))
return -1;
@@ -1420,7 +1474,7 @@
static int make_color_fgbg (SLCONST char *fg, SLCONST char *bg, SLtt_Char_Type *fgbg)
{
- SLtt_Char_Type f = 0xFFFFFFFFU, b = 0xFFFFFFFFU;
+ SLtt_Char_Type f = CHAR_INVALID, b = CHAR_INVALID;
SLCONST char *dfg, *dbg;
unsigned int i;
char bgbuf[16], fgbuf[16];
@@ -1464,7 +1518,7 @@
}
}
- if ((f == 0xFFFFFFFFU) || (b == 0xFFFFFFFFU))
+ if ((f == CHAR_INVALID) || (b == CHAR_INVALID))
return -1;
*fgbg = fb_to_fgbg (f, b) | fattr | battr;
@@ -1509,6 +1563,7 @@
{
int bg0, fg0;
int unknown_attributes;
+ char tmpbuf[32];
if (Worthless_Highlight) return;
if (fgbg == Current_Fgbg) return;
@@ -1557,6 +1612,14 @@
{
if (fg0 == SLSMG_COLOR_DEFAULT)
tt_write_string (Default_Color_Fg_Str);
+ else if (fg0 & (1 << 24))
+ {
+ sprintf (tmpbuf, Color_RGB_Fg_Str,
+ (int) ((fg0 >> 16) & 0xFF),
+ (int) ((fg0 >> 8) & 0xFF),
+ (int) (fg0 & 0xFF));
+ tt_write_string (tmpbuf);
+ }
else
tt_printf (Color_Fg_Str, COLOR_ARG(fg0, Is_Fg_BGR), 0);
}
@@ -1566,6 +1629,14 @@
{
if (bg0 == SLSMG_COLOR_DEFAULT)
tt_write_string (Default_Color_Bg_Str);
+ else if (bg0 & (1 << 24))
+ {
+ sprintf (tmpbuf, Color_RGB_Bg_Str,
+ (int) ((bg0 >> 16) & 0xFF),
+ (int) ((bg0 >> 8) & 0xFF),
+ (int) (bg0 & 0xFF));
+ tt_write_string (tmpbuf);
+ }
else
tt_printf (Color_Bg_Str, COLOR_ARG(bg0, Is_Bg_BGR), 0);
}
@@ -1589,7 +1660,7 @@
tt_write_string (Norm_Vid_Str);
}
else tt_write_string (Rev_Vid_Str);
- Current_Fgbg = 0xFFFFFFFFU;
+ Current_Fgbg = CHAR_INVALID;
return;
}
@@ -3028,7 +3099,7 @@
SLtt_normal_video (); /* MSKermit requires this */
tt_write_string(Norm_Vid_Str);
- Current_Fgbg = 0xFFFFFFFFU;
+ Current_Fgbg = CHAR_INVALID;
SLtt_set_alt_char_set (0);
if (SLtt_Use_Ansi_Colors)
{
@@ -3040,7 +3111,7 @@
else tt_write_string ("\033[0m\033[m");
}
else tt_write_string (Reset_Color_String);
- Current_Fgbg = 0xFFFFFFFFU;
+ Current_Fgbg = CHAR_INVALID;
}
SLtt_erase_line ();
SLtt_deinit_keypad ();
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