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/* Pango - Myanmar module
* myanmar.c:
*
* Copyright (C) 2000 SuSE Linux Ltd
* Author: Robert Brady <robert@suse.co.uk>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* This is the renderer for the Burmese (Myanmar) script. This
* script is used to write the following languages :
*
* my Burmese
* shn Shan
* mkh Mon
* pi Pali
*
*/
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include "pangox.h"
#include "pango-indic.h"
#include "pango-engine.h"
#define RANGE_START 0x1000
#define RANGE_SIZE 0x80
#define SCRIPT_STRING "Myanmar"
#define SCRIPT_ENGINE_NAME SCRIPT_STRING "ScriptEngineX"
#define VIRAMA 0x1039
#include "pango-indic-script.h"
static gboolean is_prefixing_vowel (gunichar i);
static gboolean is_vowel_sign (gunichar i);
static gunichar vowel_sign_to_matra (gunichar i);
static PangoIndicScript script = {
SCRIPT_STRING,
&is_prefixing_vowel,
&is_vowel_sign,
&vowel_sign_to_matra,
};
static char *default_charset = "iso10646-brm";
static PangoEngineRange pango_indic_range[] =
{
{RANGE_START, RANGE_END, "*"},
};
SCRIPT_ENGINE_DEFINITION
static PangoCoverage *
pango_engine_get_coverage (PangoFont * font, const char *lang)
{
gunichar i;
PangoCoverage *result = pango_coverage_new ();
PangoXSubfont subfont;
int dev_font = pango_x_find_first_subfont (font, &default_charset, 1, &subfont);
if (dev_font)
{
for (i = RANGE_START; i <= RANGE_END; i++)
pango_coverage_set (result, i, PANGO_COVERAGE_EXACT);
}
return result;
}
static gboolean
is_vowel_sign (gunichar i)
{
/* one that combines, whether or not it spaces */
return (i >= 0x102c && i <= 0x1032) || (i >= 0x1056 && i <= 0x1059);
}
static gunichar
vowel_sign_to_matra (gunichar i)
{
if (i >= 0x102d && i <= 0x1032)
return i - 0x102d + 0x1023;
return i;
}
static int
is_consonant (int i)
{
return (i >= 0x1000 && i <= 0x1020) || (i >= 0x1052 && i <= 0x1053);
}
static int
is_ind_vowel (int i)
{
return (i >= 0x1021 && i <= 0x102a);
}
static int
is_prefixing_vowel (gunichar what)
{
return (what == 0x1031);
}
static void
pango_engine_shape (PangoFont * font,
const char *text,
int length,
PangoAnalysis * analysis, PangoGlyphString * glyphs)
{
PangoXSubfont subfont;
int n_chars, n_glyph;
int lvl;
int i;
gunichar *wc;
int sb;
int n_syls;
gunichar **syls = g_malloc (sizeof (gunichar **));
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
n_chars = n_glyph = g_utf8_strlen (text, length);
lvl = pango_x_find_first_subfont (font, &default_charset, 1, &subfont);
if (!lvl)
{
pango_x_fallback_shape (font, glyphs, text, n_chars);
return;
}
pango_indic_split_out_characters (&script, text, n_chars, &wc,
&n_glyph, glyphs);
pango_indic_convert_vowels (&script, FALSE, &n_glyph, wc, FALSE);
n_syls = 1;
syls[0] = wc;
sb = glyphs->log_clusters[0];
for (i = 0; i < n_glyph; i++)
{
if (i && (is_consonant (wc[i]) | is_ind_vowel (wc[i]))
&& wc[i - 1] != VIRAMA)
{
syls = g_realloc (syls, ((n_syls + 2) * sizeof (gunichar **)));
syls[n_syls] = wc + i;
n_syls++;
sb = glyphs->log_clusters[i];
}
glyphs->log_clusters[i] = sb;
}
syls[n_syls] = wc + i;
for (i = 0; i < n_syls; i++)
{
pango_indic_shift_vowels (&script, syls[i], syls[i + 1]);
}
pango_indic_compact (&script, &n_glyph, wc, glyphs->log_clusters);
while ((i=pango_x_apply_ligatures (font, subfont, &wc, &n_glyph, &glyphs->log_clusters)))
{
pango_indic_compact (&script, &n_glyph, wc, glyphs->log_clusters);
}
pango_indic_compact (&script, &n_glyph, wc, glyphs->log_clusters);
pango_glyph_string_set_size (glyphs, n_glyph);
for (i = 0; i < n_glyph; i++)
{
PangoRectangle logical_rect;
glyphs->glyphs[i].glyph = PANGO_X_MAKE_GLYPH (subfont, wc[i]);
pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph,
NULL, &logical_rect);
glyphs->glyphs[i].geometry.x_offset = 0;
glyphs->glyphs[i].geometry.y_offset = 0;
glyphs->glyphs[i].geometry.width = logical_rect.width;
}
g_free (syls);
}
static PangoEngine *
pango_engine_x_new ()
{
PangoEngineShape *result;
result = g_new (PangoEngineShape, 1);
result->engine.id = SCRIPT_ENGINE_NAME;
result->engine.type = PANGO_ENGINE_TYPE_SHAPE;
result->engine.length = sizeof (result);
result->script_shape = pango_engine_shape;
result->get_coverage = pango_engine_get_coverage;
return (PangoEngine *) result;
}
#ifdef MYANMAR_X_MODULE_PREFIX
#define MODULE_ENTRY(func) _pango_myanmar_x_##func
#else
#define MODULE_ENTRY(func) func
#endif
void
MODULE_ENTRY(script_engine_list) (PangoEngineInfo ** engines, int *n_engines)
{
*engines = script_engines;
*n_engines = n_script_engines;
}
PangoEngine *
MODULE_ENTRY(script_engine_load) (const char *id)
{
if (!strcmp (id, SCRIPT_ENGINE_NAME))
return pango_engine_x_new ();
else
return NULL;
}
void
MODULE_ENTRY(script_engine_unload) (PangoEngine * engine)
{
}
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