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freebsd-nq/sys/teken/teken.c
Bruce Evans 2610c9f2b2 Add teken_256to16() to convert xterm-256 256-color codes to xterm 16-color 
codes.  This will be used to fix bright colors.

Improve teken_256to8().  Use a lookup table instead of calculations.  The
calculations were inaccurate since they used indexes into the xterm-256
6x6x6 color map instead of actual xterm colors.  Also, change the threshold
for converting to a primary color: require the primary's component to be
2 or more higher instead of just higher.  This affects about 1/5 of the
table entries and gives uniformly distributed colors in the 6x6x6 submap
except for greys (35 entries each for red, green, blue, cyan, brown and
magenta, instead of approx. only 15 each for the mixed colors).  Even
more mixed colors would be better for matching colors, but uniform
distribution is best for preserving contrast.

For teken_256to16(), bright colors are just the ones with luminosity >=
60%.  These are actually light colors (more white instead of more
saturation), while xterm bright colors except for white itself are
actually saturated with no white, so have luminosity only 50%.

These functions are layering violations.  teken cannot do correct
conversions since it shouldn't know the color maps of anything except
xterm.  Translating through xterm-16 colors loses information.  This
gives bugs like xterm-256 near-brown -> xterm-16 red -> VGA red.
2017-03-16 16:40:54 +00:00

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/*-
* Copyright (c) 2008-2009 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#if defined(__FreeBSD__) && defined(_KERNEL)
#include <sys/param.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/systm.h>
#define teken_assert(x) MPASS(x)
#else /* !(__FreeBSD__ && _KERNEL) */
#include <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define teken_assert(x) assert(x)
#endif /* __FreeBSD__ && _KERNEL */
/* debug messages */
#define teken_printf(x,...)
/* Private flags for t_stateflags. */
#define TS_FIRSTDIGIT 0x0001 /* First numeric digit in escape sequence. */
#define TS_INSERT 0x0002 /* Insert mode. */
#define TS_AUTOWRAP 0x0004 /* Autowrap. */
#define TS_ORIGIN 0x0008 /* Origin mode. */
#define TS_WRAPPED 0x0010 /* Next character should be printed on col 0. */
#define TS_8BIT 0x0020 /* UTF-8 disabled. */
#define TS_CONS25 0x0040 /* cons25 emulation. */
#define TS_INSTRING 0x0080 /* Inside string. */
#define TS_CURSORKEYS 0x0100 /* Cursor keys mode. */
/* Character that blanks a cell. */
#define BLANK ' '
#include "teken.h"
#include "teken_wcwidth.h"
#include "teken_scs.h"
static teken_state_t teken_state_init;
/*
* Wrappers for hooks.
*/
static inline void
teken_funcs_bell(teken_t *t)
{
t->t_funcs->tf_bell(t->t_softc);
}
static inline void
teken_funcs_cursor(teken_t *t)
{
teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
}
static inline void
teken_funcs_putchar(teken_t *t, const teken_pos_t *p, teken_char_t c,
const teken_attr_t *a)
{
teken_assert(p->tp_row < t->t_winsize.tp_row);
teken_assert(p->tp_col < t->t_winsize.tp_col);
t->t_funcs->tf_putchar(t->t_softc, p, c, a);
}
static inline void
teken_funcs_fill(teken_t *t, const teken_rect_t *r,
const teken_char_t c, const teken_attr_t *a)
{
teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
t->t_funcs->tf_fill(t->t_softc, r, c, a);
}
static inline void
teken_funcs_copy(teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
{
teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);
t->t_funcs->tf_copy(t->t_softc, r, p);
}
static inline void
teken_funcs_param(teken_t *t, int cmd, unsigned int value)
{
t->t_funcs->tf_param(t->t_softc, cmd, value);
}
static inline void
teken_funcs_respond(teken_t *t, const void *buf, size_t len)
{
t->t_funcs->tf_respond(t->t_softc, buf, len);
}
#include "teken_subr.h"
#include "teken_subr_compat.h"
/*
* Programming interface.
*/
void
teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
{
teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };
t->t_funcs = tf;
t->t_softc = softc;
t->t_nextstate = teken_state_init;
t->t_stateflags = 0;
t->t_utf8_left = 0;
t->t_defattr.ta_format = 0;
t->t_defattr.ta_fgcolor = TC_WHITE;
t->t_defattr.ta_bgcolor = TC_BLACK;
teken_subr_do_reset(t);
teken_set_winsize(t, &tp);
}
static void
teken_input_char(teken_t *t, teken_char_t c)
{
/*
* There is no support for DCS and OSC. Just discard strings
* until we receive characters that may indicate string
* termination.
*/
if (t->t_stateflags & TS_INSTRING) {
switch (c) {
case '\x1B':
t->t_stateflags &= ~TS_INSTRING;
break;
case '\a':
t->t_stateflags &= ~TS_INSTRING;
return;
default:
return;
}
}
switch (c) {
case '\0':
break;
case '\a':
teken_subr_bell(t);
break;
case '\b':
teken_subr_backspace(t);
break;
case '\n':
case '\x0B':
teken_subr_newline(t);
break;
case '\x0C':
teken_subr_newpage(t);
break;
case '\x0E':
if (t->t_stateflags & TS_CONS25)
t->t_nextstate(t, c);
else
t->t_curscs = 1;
break;
case '\x0F':
if (t->t_stateflags & TS_CONS25)
t->t_nextstate(t, c);
else
t->t_curscs = 0;
break;
case '\r':
teken_subr_carriage_return(t);
break;
case '\t':
teken_subr_horizontal_tab(t);
break;
default:
t->t_nextstate(t, c);
break;
}
/* Post-processing assertions. */
teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
/* Origin region has to be window size or the same as scrollreg. */
teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
(t->t_originreg.ts_begin == 0 &&
t->t_originreg.ts_end == t->t_winsize.tp_row));
}
static void
teken_input_byte(teken_t *t, unsigned char c)
{
/*
* UTF-8 handling.
*/
if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
/* One-byte sequence. */
t->t_utf8_left = 0;
teken_input_char(t, c);
} else if ((c & 0xe0) == 0xc0) {
/* Two-byte sequence. */
t->t_utf8_left = 1;
t->t_utf8_partial = c & 0x1f;
} else if ((c & 0xf0) == 0xe0) {
/* Three-byte sequence. */
t->t_utf8_left = 2;
t->t_utf8_partial = c & 0x0f;
} else if ((c & 0xf8) == 0xf0) {
/* Four-byte sequence. */
t->t_utf8_left = 3;
t->t_utf8_partial = c & 0x07;
} else if ((c & 0xc0) == 0x80) {
if (t->t_utf8_left == 0)
return;
t->t_utf8_left--;
t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
if (t->t_utf8_left == 0) {
teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
teken_input_char(t, t->t_utf8_partial);
}
}
}
void
teken_input(teken_t *t, const void *buf, size_t len)
{
const char *c = buf;
while (len-- > 0)
teken_input_byte(t, *c++);
}
const teken_pos_t *
teken_get_cursor(teken_t *t)
{
return (&t->t_cursor);
}
void
teken_set_cursor(teken_t *t, const teken_pos_t *p)
{
/* XXX: bounds checking with originreg! */
teken_assert(p->tp_row < t->t_winsize.tp_row);
teken_assert(p->tp_col < t->t_winsize.tp_col);
t->t_cursor = *p;
}
const teken_attr_t *
teken_get_curattr(teken_t *t)
{
return (&t->t_curattr);
}
void
teken_set_curattr(teken_t *t, const teken_attr_t *a)
{
t->t_curattr = *a;
}
const teken_attr_t *
teken_get_defattr(teken_t *t)
{
return (&t->t_defattr);
}
void
teken_set_defattr(teken_t *t, const teken_attr_t *a)
{
t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
}
const teken_pos_t *
teken_get_winsize(teken_t *t)
{
return (&t->t_winsize);
}
static void
teken_trim_cursor_pos(teken_t *t, const teken_pos_t *new)
{
const teken_pos_t *cur;
cur = &t->t_winsize;
if (cur->tp_row < new->tp_row || cur->tp_col < new->tp_col)
return;
if (t->t_cursor.tp_row >= new->tp_row)
t->t_cursor.tp_row = new->tp_row - 1;
if (t->t_cursor.tp_col >= new->tp_col)
t->t_cursor.tp_col = new->tp_col - 1;
}
void
teken_set_winsize(teken_t *t, const teken_pos_t *p)
{
teken_trim_cursor_pos(t, p);
t->t_winsize = *p;
teken_subr_do_reset(t);
}
void
teken_set_winsize_noreset(teken_t *t, const teken_pos_t *p)
{
teken_trim_cursor_pos(t, p);
t->t_winsize = *p;
teken_subr_do_resize(t);
}
void
teken_set_8bit(teken_t *t)
{
t->t_stateflags |= TS_8BIT;
}
void
teken_set_cons25(teken_t *t)
{
t->t_stateflags |= TS_CONS25;
}
/*
* State machine.
*/
static void
teken_state_switch(teken_t *t, teken_state_t *s)
{
t->t_nextstate = s;
t->t_curnum = 0;
t->t_stateflags |= TS_FIRSTDIGIT;
}
static int
teken_state_numbers(teken_t *t, teken_char_t c)
{
teken_assert(t->t_curnum < T_NUMSIZE);
if (c >= '0' && c <= '9') {
if (t->t_stateflags & TS_FIRSTDIGIT) {
/* First digit. */
t->t_stateflags &= ~TS_FIRSTDIGIT;
t->t_nums[t->t_curnum] = c - '0';
} else if (t->t_nums[t->t_curnum] < UINT_MAX / 100) {
/*
* There is no need to continue parsing input
* once the value exceeds the size of the
* terminal. It would only allow for integer
* overflows when performing arithmetic on the
* cursor position.
*
* Ignore any further digits if the value is
* already UINT_MAX / 100.
*/
t->t_nums[t->t_curnum] =
t->t_nums[t->t_curnum] * 10 + c - '0';
}
return (1);
} else if (c == ';') {
if (t->t_stateflags & TS_FIRSTDIGIT)
t->t_nums[t->t_curnum] = 0;
/* Only allow a limited set of arguments. */
if (++t->t_curnum == T_NUMSIZE) {
teken_state_switch(t, teken_state_init);
return (1);
}
t->t_stateflags |= TS_FIRSTDIGIT;
return (1);
} else {
if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
/* Finish off the last empty argument. */
t->t_nums[t->t_curnum] = 0;
t->t_curnum++;
} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
/* Also count the last argument. */
t->t_curnum++;
}
}
return (0);
}
#define k TC_BLACK
#define b TC_BLUE
#define y TC_BROWN
#define c TC_CYAN
#define g TC_GREEN
#define m TC_MAGENTA
#define r TC_RED
#define w TC_WHITE
#define K (TC_BLACK | TC_LIGHT)
#define B (TC_BLUE | TC_LIGHT)
#define Y (TC_BROWN | TC_LIGHT)
#define C (TC_CYAN | TC_LIGHT)
#define G (TC_GREEN | TC_LIGHT)
#define M (TC_MAGENTA | TC_LIGHT)
#define R (TC_RED | TC_LIGHT)
#define W (TC_WHITE | TC_LIGHT)
/**
* The xterm-256 color map has steps of 0x28 (in the range 0-0xff), except
* for the first step which is 0x5f. Scale to the range 0-6 by dividing
* by 0x28 and rounding down. The range of 0-5 cannot represent the
* larger first step.
*
* This table is generated by the follow rules:
* - if all components are equal, the result is black for (0, 0, 0) and
* (2, 2, 2), else white; otherwise:
* - subtract the smallest component from all components
* - if this gives only one nonzero component, then that is the color
* - else if one component is 2 or more larger than the other nonzero one,
* then that component gives the color
* - else there are 2 nonzero components. The color is that of a small
* equal mixture of these components (cyan, yellow or magenta). E.g.,
* (0, 5, 6) (Turquoise2) is a much purer cyan than (0, 2, 3)
* (DeepSkyBlue4), but we map both to cyan since we can't represent
* delicate shades of either blue or cyan and blue would be worse.
* Here it is important that components of 1 never occur. Blue would
* be twice as large as green in (0, 1, 2).
*/
static const teken_color_t teken_256to8tab[] = {
/* xterm-16+ 8 dark colors: */
0, r, g, y, b, m, c, w,
/* xterm-16+ 8 light colors: */
0, R, G, Y, B, M, C, W,
/* Red0 submap. */
k, b, b, b, b, b,
g, c, c, b, b, b,
g, c, c, c, b, b,
g, g, c, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red2 submap. */
r, m, m, b, b, b,
y, k, b, b, b, b,
y, g, c, c, b, b,
g, g, c, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red3 submap. */
r, m, m, m, b, b,
y, r, m, m, b, b,
y, y, w, b, b, b,
y, y, g, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red4 submap. */
r, r, m, m, m, b,
r, r, m, m, m, b,
y, y, r, m, m, b,
y, y, y, w, b, b,
y, y, y, g, c, c,
g, g, g, g, c, c,
/* Red5 submap. */
r, r, r, m, m, m,
r, r, r, m, m, m,
r, r, r, m, m, m,
y, y, y, r, m, m,
y, y, y, y, w, b,
y, y, y, y, g, c,
/* Red6 submap. */
r, r, r, r, m, m,
r, r, r, r, m, m,
r, r, r, r, m, m,
r, r, r, r, m, m,
y, y, y, y, r, m,
y, y, y, y, y, w,
/* Grey submap. */
k, k, k, k, k, k,
k, k, k, k, k, k,
w, w, w, w, w, w,
w, w, w, w, w, w,
};
/*
* This table is generated from the previous one by setting TC_LIGHT for
* entries whose luminosity in the xterm256 color map is 60% or larger.
* Thus the previous table is currently not really needed. It will be
* used for different fine tuning of the tables.
*/
static const teken_color_t teken_256to16tab[] = {
/* xterm-16+ 8 dark colors: */
0, r, g, y, b, m, c, w,
/* xterm-16+ 8 light colors: */
0, R, G, Y, B, M, C, W,
/* Red0 submap. */
k, b, b, b, b, b,
g, c, c, b, b, b,
g, c, c, c, b, b,
g, g, c, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red2 submap. */
r, m, m, b, b, b,
y, K, b, b, B, B,
y, g, c, c, B, B,
g, g, c, c, C, B,
g, G, G, C, C, C,
g, G, G, G, C, C,
/* Red3 submap. */
r, m, m, m, b, b,
y, r, m, m, B, B,
y, y, w, B, B, B,
y, y, G, C, C, B,
g, G, G, C, C, C,
g, G, G, G, C, C,
/* Red4 submap. */
r, r, m, m, m, b,
r, r, m, m, M, B,
y, y, R, M, M, B,
y, y, Y, W, B, B,
y, Y, Y, G, C, C,
g, G, G, G, C, C,
/* Red5 submap. */
r, r, r, m, m, m,
r, R, R, M, M, M,
r, R, R, M, M, M,
y, Y, Y, R, M, M,
y, Y, Y, Y, W, B,
y, Y, Y, Y, G, C,
/* Red6 submap. */
r, r, r, r, m, m,
r, R, R, R, M, M,
r, R, R, R, M, M,
r, R, R, R, M, M,
y, Y, Y, Y, R, M,
y, Y, Y, Y, Y, W,
/* Grey submap. */
k, k, k, k, k, k,
K, K, K, K, K, K,
w, w, w, w, w, w,
W, W, W, W, W, W,
};
#undef k
#undef b
#undef y
#undef c
#undef g
#undef m
#undef r
#undef w
#undef K
#undef B
#undef Y
#undef C
#undef G
#undef M
#undef R
#undef W
teken_color_t
teken_256to8(teken_color_t c)
{
return (teken_256to8tab[c % 256]);
}
teken_color_t
teken_256to16(teken_color_t c)
{
return (teken_256to16tab[c % 256]);
}
static const char * const special_strings_cons25[] = {
[TKEY_UP] = "\x1B[A", [TKEY_DOWN] = "\x1B[B",
[TKEY_LEFT] = "\x1B[D", [TKEY_RIGHT] = "\x1B[C",
[TKEY_HOME] = "\x1B[H", [TKEY_END] = "\x1B[F",
[TKEY_INSERT] = "\x1B[L", [TKEY_DELETE] = "\x7F",
[TKEY_PAGE_UP] = "\x1B[I", [TKEY_PAGE_DOWN] = "\x1B[G",
[TKEY_F1] = "\x1B[M", [TKEY_F2] = "\x1B[N",
[TKEY_F3] = "\x1B[O", [TKEY_F4] = "\x1B[P",
[TKEY_F5] = "\x1B[Q", [TKEY_F6] = "\x1B[R",
[TKEY_F7] = "\x1B[S", [TKEY_F8] = "\x1B[T",
[TKEY_F9] = "\x1B[U", [TKEY_F10] = "\x1B[V",
[TKEY_F11] = "\x1B[W", [TKEY_F12] = "\x1B[X",
};
static const char * const special_strings_ckeys[] = {
[TKEY_UP] = "\x1BOA", [TKEY_DOWN] = "\x1BOB",
[TKEY_LEFT] = "\x1BOD", [TKEY_RIGHT] = "\x1BOC",
[TKEY_HOME] = "\x1BOH", [TKEY_END] = "\x1BOF",
};
static const char * const special_strings_normal[] = {
[TKEY_UP] = "\x1B[A", [TKEY_DOWN] = "\x1B[B",
[TKEY_LEFT] = "\x1B[D", [TKEY_RIGHT] = "\x1B[C",
[TKEY_HOME] = "\x1B[H", [TKEY_END] = "\x1B[F",
[TKEY_INSERT] = "\x1B[2~", [TKEY_DELETE] = "\x1B[3~",
[TKEY_PAGE_UP] = "\x1B[5~", [TKEY_PAGE_DOWN] = "\x1B[6~",
[TKEY_F1] = "\x1BOP", [TKEY_F2] = "\x1BOQ",
[TKEY_F3] = "\x1BOR", [TKEY_F4] = "\x1BOS",
[TKEY_F5] = "\x1B[15~", [TKEY_F6] = "\x1B[17~",
[TKEY_F7] = "\x1B[18~", [TKEY_F8] = "\x1B[19~",
[TKEY_F9] = "\x1B[20~", [TKEY_F10] = "\x1B[21~",
[TKEY_F11] = "\x1B[23~", [TKEY_F12] = "\x1B[24~",
};
const char *
teken_get_sequence(teken_t *t, unsigned int k)
{
/* Cons25 mode. */
if (t->t_stateflags & TS_CONS25 &&
k < sizeof special_strings_cons25 / sizeof(char *))
return (special_strings_cons25[k]);
/* Cursor keys mode. */
if (t->t_stateflags & TS_CURSORKEYS &&
k < sizeof special_strings_ckeys / sizeof(char *))
return (special_strings_ckeys[k]);
/* Default xterm sequences. */
if (k < sizeof special_strings_normal / sizeof(char *))
return (special_strings_normal[k]);
return (NULL);
}
#include "teken_state.h"
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