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Extend libteken to support CJK fullwidth characters.

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Introduce a new formatting bit (TF_CJK_RIGHT) that is set when putting a
cell that is the right part of a CJK fullwidth character. This will
allow drivers like vt(9) to support fullwidth characters properly.

emaste@ has a patch to extend vt(9)'s font handling to increase the
number of Unicode -> glyph maps from 2 ({normal,bold)} to 4
({normal,bold} x {left,right}). This will need to use this formatting
bit to determine whether to draw the left or right glyph.

Reviewed by:	emaste
This commit is contained in:
Ed Schouten 2013-12-20 21:31:50 +00:00
parent 5c3c610835
commit a6c26592f1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=259667
7 changed files with 34 additions and 20 deletions
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7
sys/dev/syscons/scterm-teken.c
View File

@ -553,7 +553,14 @@ scteken_putchar(void *arg, const teken_pos_t *tp, teken_char_t c,
vm_offset_t p;
int cursor, attr;
/*
* No support for printing right hand sides for CJK fullwidth
* characters. Simply print a space and assume that the left
* hand side describes the entire character.
*/
attr = scteken_attr(a) << 8;
if (a->ta_format & TF_CJK_RIGHT)
c = ' ';
#ifdef TEKEN_UTF8
scteken_get_cp437(&c, &attr);
#endif /* TEKEN_UTF8 */

8
sys/dev/vt/vt_font.c
View File

@ -87,7 +87,15 @@ vtfont_lookup(const struct vt_font *vf, term_char_t c)
uint16_t dst;
size_t stride;
/*
* No support for printing right hand sides for CJK fullwidth
* characters. Simply print a space and assume that the left
* hand side describes the entire character.
*/
src = TCHAR_CHARACTER(c);
if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
src = ' ';
if (TCHAR_FORMAT(c) & TF_BOLD) {
dst = vtfont_bisearch(vf->vf_bold, vf->vf_bold_length, src);
if (dst != 0)

2
sys/kern/subr_terminal.c
View File

@ -128,7 +128,7 @@ static const teken_attr_t default_message = {
};
#define TCHAR_CREATE(c, a) ((c) | \
(a)->ta_format << 22 | \
(a)->ta_format << 21 | \
teken_256to8((a)->ta_fgcolor) << 26 | \
teken_256to8((a)->ta_bgcolor) << 29)

5
sys/sys/terminal.h
View File

@ -62,15 +62,14 @@ struct tty;
*
* Bits Meaning
* 0-20: Character value
* 21: Unused
* 22-25: Bold, underline, blink, reverse
* 21-25: Bold, underline, blink, reverse, right part of CJK fullwidth character
* 26-28: Foreground color
* 29-31: Background color
*/
typedef uint32_t term_char_t;
#define TCHAR_CHARACTER(c) ((c) & 0x1fffff)
#define TCHAR_FORMAT(c) (((c) >> 22) & 0xf)
#define TCHAR_FORMAT(c) (((c) >> 21) & 0x1f)
#define TCHAR_FGCOLOR(c) (((c) >> 26) & 0x7)
#define TCHAR_BGCOLOR(c) ((c) >> 29)

7
sys/teken/demo/teken_demo.c
View File

@ -86,9 +86,10 @@ printchar(const teken_pos_t *p)
assert(p->tp_row < NROWS);
assert(p->tp_col < NCOLS);
getyx(stdscr, y, x);
px = &buffer[p->tp_col][p->tp_row];
/* No need to print right hand side of CJK character manually. */
if (px->a.ta_format & TF_CJK_RIGHT)
return;
/* Convert Unicode to UTF-8. */
if (px->c < 0x80) {
@ -118,8 +119,8 @@ printchar(const teken_pos_t *p)
bkgdset(attr | COLOR_PAIR(teken_256to8(px->a.ta_fgcolor) +
8 * teken_256to8(px->a.ta_bgcolor)));
getyx(stdscr, y, x);
mvaddstr(p->tp_row, p->tp_col, str);
move(y, x);
}

9
sys/teken/teken.h
View File

@ -41,10 +41,11 @@
typedef uint32_t teken_char_t;
typedef unsigned short teken_unit_t;
typedef unsigned char teken_format_t;
#define TF_BOLD 0x01
#define TF_UNDERLINE 0x02
#define TF_BLINK 0x04
#define TF_REVERSE 0x08
#define TF_BOLD 0x01 /* Bold character. */
#define TF_UNDERLINE 0x02 /* Underline character. */
#define TF_BLINK 0x04 /* Blinking character. */
#define TF_REVERSE 0x08 /* Reverse rendered character. */
#define TF_CJK_RIGHT 0x10 /* Right-hand side of CJK character. */
typedef unsigned char teken_color_t;
#define TC_BLACK 0
#define TC_RED 1

16
sys/teken/teken_subr.h
View File

@ -791,21 +791,19 @@ teken_subr_do_putchar(teken_t *t, const teken_pos_t *tp, teken_char_t c,
teken_funcs_copy(t, &ctr, &ctp);
}
teken_funcs_putchar(t, tp, c, &t->t_curattr);
if (width == 2 && tp->tp_col + 1 < t->t_winsize.tp_col) {
teken_pos_t tp2;
teken_attr_t attr;
/*
* Store a space behind double width characters before
* actually printing them. This prevents artifacts when
* the consumer doesn't render it using double width
* glyphs.
*/
/* Print second half of CJK fullwidth character. */
tp2.tp_row = tp->tp_row;
tp2.tp_col = tp->tp_col + 1;
teken_funcs_putchar(t, &tp2, BLANK, &t->t_curattr);
attr = t->t_curattr;
attr.ta_format |= TF_CJK_RIGHT;
teken_funcs_putchar(t, &tp2, c, &attr);
}
teken_funcs_putchar(t, tp, c, &t->t_curattr);
}
static void