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/* Pango
* break-thai.c:
*
* Copyright (C) 2003 Theppitak Karoonboonyanan <thep@linux.thai.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "pango-break.h"
#include "pango-impl-utils.h"
#ifdef HAVE_LIBTHAI
#include <thai/thwchar.h>
#include <thai/thbrk.h>
/* TODO
* LibThai 0.1.23 claims to be thread-safe.
* Check that and avoid locking?
* http://linux.thai.net/node/286
*/
G_LOCK_DEFINE_STATIC (th_brk);
/*
* tis_text is assumed to be large enough to hold the converted string,
* i.e. it must be at least pango_utf8_strlen(text, len)+1 bytes.
*/
static thchar_t *
utf8_to_tis (const char *text, int len, thchar_t *tis_text, int *tis_cnt)
{
thchar_t *tis_p;
const char *text_p;
tis_p = tis_text;
for (text_p = text; text_p < text + len; text_p = g_utf8_next_char (text_p))
*tis_p++ = th_uni2tis (g_utf8_get_char (text_p));
*tis_p++ = '\0';
*tis_cnt = tis_p - tis_text;
return tis_text;
}
#endif
static void
break_thai (const char *text,
int len,
const PangoAnalysis *analysis G_GNUC_UNUSED,
PangoLogAttr *attrs,
int attrs_len G_GNUC_UNUSED)
{
#ifdef HAVE_LIBTHAI
thchar_t tis_stack[512];
int brk_stack[512];
thchar_t *tis_text;
int *brk_pnts;
int cnt;
cnt = pango_utf8_strlen (text, len) + 1;
tis_text = tis_stack;
if (cnt > (int) G_N_ELEMENTS (tis_stack))
tis_text = g_new (thchar_t, cnt);
utf8_to_tis (text, len, tis_text, &cnt);
brk_pnts = brk_stack;
if (cnt > (int) G_N_ELEMENTS (brk_stack))
brk_pnts = g_new (int, cnt);
/* find line break positions */
G_LOCK (th_brk);
len = th_brk (tis_text, brk_pnts, cnt);
G_UNLOCK (th_brk);
for (cnt = 0; cnt < len; cnt++)
if (attrs[brk_pnts[cnt]].is_char_break)
{
/* Only allow additional line breaks if line-breaking is NOT
* prohibited. (The alternative would be to set is_char_break to
* TRUE as well. NOT setting it will break invariants that any
* line break opportunity is also a char break opportunity. */
attrs[brk_pnts[cnt]].is_line_break = TRUE;
attrs[brk_pnts[cnt]].is_word_start = TRUE;
attrs[brk_pnts[cnt]].is_word_end = TRUE;
}
if (brk_pnts != brk_stack)
g_free (brk_pnts);
if (tis_text != tis_stack)
g_free (tis_text);
#endif
}
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