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/* Pango
* thai-x.c:
*
* Copyright (C) 1999 Red Hat Software
* Author: Owen Taylor <otaylor@redhat.com>
*
* Software and Language Engineering Laboratory, NECTEC
* Author: Theppitak Karoonboonyanan <thep@links.nectec.or.th>
*
* Copyright (c) 1996-2000 by Sun Microsystems, Inc.
* Author: Chookij Vanatham <Chookij.Vanatham@Eng.Sun.COM>
*
* 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.
*/
#include "config.h"
#include <string.h>
#include <glib.h>
#include "pango-engine.h"
#include "thai-shaper.h"
#define SCRIPT_ENGINE_NAME "ThaiScriptEngineX"
/* We handle the range U+0e01 to U+0e5b exactly
*/
static PangoEngineRange thai_ranges[] = {
{ 0x0e01, 0x0e5b, "*" }, /* Thai */
};
static PangoEngineInfo script_engines[] = {
{
SCRIPT_ENGINE_NAME,
PANGO_ENGINE_TYPE_SHAPE,
PANGO_RENDER_TYPE_X,
thai_ranges, G_N_ELEMENTS(thai_ranges)
}
};
static PangoGlyph
thai_x_make_glyph (ThaiFontInfo *font_info, unsigned int c)
{
return PANGO_X_MAKE_GLYPH (font_info->subfont, c);
}
static PangoGlyph
thai_x_make_unknown_glyph (ThaiFontInfo *font_info, unsigned int c)
{
return pango_x_get_unknown_glyph (font_info->font);
}
static gboolean
thai_x_has_glyph (ThaiFontInfo *font_info, PangoGlyph glyph)
{
return pango_x_has_glyph (font_info->font, glyph);
}
/* Returns a structure with information we will use to rendering given the
* #PangoFont. This is computed once per font and cached for later retrieval.
*/
static ThaiFontInfo *
thai_x_get_font_info (PangoFont *font)
{
static const char *charsets[] = {
"tis620-2",
"tis620-1",
"tis620-0",
"xtis620.2529-1",
"xtis-0",
"tis620.2533-1",
"tis620.2529-1",
"iso8859-11",
"iso10646-1",
};
static const int charset_types[] = {
THAI_FONT_TIS_WIN,
THAI_FONT_TIS_MAC,
THAI_FONT_TIS,
THAI_FONT_XTIS,
THAI_FONT_XTIS,
THAI_FONT_TIS,
THAI_FONT_TIS,
THAI_FONT_TIS,
THAI_FONT_ISO10646
};
ThaiFontInfo *font_info;
GQuark info_id = g_quark_from_string ("thai-font-info");
font_info = g_object_get_qdata (G_OBJECT (font), info_id);
if (!font_info)
{
/* No cached information not found, so we need to compute it
* from scratch
*/
PangoXSubfont *subfont_ids;
gint *subfont_charsets;
gint n_subfonts, i;
font_info = g_new (ThaiFontInfo, 1);
font_info->font = font;
font_info->font_set = THAI_FONT_NONE;
g_object_set_qdata_full (G_OBJECT (font), info_id, font_info, (GDestroyNotify)g_free);
n_subfonts = pango_x_list_subfonts (font, (char **)charsets, G_N_ELEMENTS (charsets),
&subfont_ids, &subfont_charsets);
for (i=0; i < n_subfonts; i++)
{
ThaiFontSet font_set = charset_types[subfont_charsets[i]];
if (font_set != THAI_FONT_ISO10646 ||
pango_x_has_glyph (font, PANGO_X_MAKE_GLYPH (subfont_ids[i], 0xe01)))
{
font_info->font_set = font_set;
font_info->subfont = subfont_ids[i];
break;
}
}
g_free (subfont_ids);
g_free (subfont_charsets);
font_info->make_glyph = thai_x_make_glyph;
font_info->make_unknown_glyph = thai_x_make_unknown_glyph;
font_info->has_glyph = thai_x_has_glyph;
}
return font_info;
}
static void
thai_engine_x_shape (PangoFont *font,
const char *text,
gint length,
PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
ThaiFontInfo *font_info;
font_info = thai_x_get_font_info (font);
thai_engine_shape(font_info, text, length, analysis, glyphs);
}
static PangoCoverage *
thai_engine_x_get_coverage (PangoFont *font,
PangoLanguage *lang)
{
PangoCoverage *result = pango_coverage_new ();
ThaiFontInfo *font_info = thai_x_get_font_info (font);
if (font_info->font_set != THAI_FONT_NONE)
{
gunichar wc;
for (wc = 0xe01; wc <= 0xe3a; wc++)
pango_coverage_set (result, wc, PANGO_COVERAGE_EXACT);
for (wc = 0xe3f; wc <= 0xe5b; wc++)
pango_coverage_set (result, wc, PANGO_COVERAGE_EXACT);
}
return result;
}
static PangoEngine *
thai_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 = thai_engine_x_shape;
result->get_coverage = thai_engine_x_get_coverage;
return (PangoEngine *)result;
}
/* The following three functions provide the public module API for
* Pango. If we are compiling it is a module, then we name the
* entry points script_engine_list, etc. But if we are compiling
* it for inclusion directly in Pango, then we need them to
* to have distinct names for this module, so we prepend
* _pango_thai_x_
*/
#ifdef X_MODULE_PREFIX
#define MODULE_ENTRY(func) _pango_thai_x_##func
#else
#define MODULE_ENTRY(func) func
#endif
/* List the engines contained within this module
*/
void
MODULE_ENTRY(script_engine_list) (PangoEngineInfo **engines, gint *n_engines)
{
*engines = script_engines;
*n_engines = G_N_ELEMENTS (script_engines);
}
/* Load a particular engine given the ID for the engine
*/
PangoEngine *
MODULE_ENTRY(script_engine_load) (const char *id)
{
if (!strcmp (id, SCRIPT_ENGINE_NAME))
return thai_engine_x_new ();
else
return NULL;
}
void
MODULE_ENTRY(script_engine_unload) (PangoEngine *engine)
{
}
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