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/* Pango - Tamil module
* tamil.c:
*
* Copyright (C) 2000 Sivaraj D
*
*/
#include <stdio.h>
#include <glib.h>
#include "pango.h"
#include "pangox.h"
#include "utils.h"
#include "taconv.h"
#define MEMBERS(strct) sizeof(strct) / sizeof(strct[1])
static PangoEngineRange tamil_range[] = {
{ 0x0b80, 0x0bff, "*" },
};
static PangoEngineInfo script_engines[] = {
{
"TamilScriptEngineLang",
PANGO_ENGINE_TYPE_LANG,
PANGO_RENDER_TYPE_NONE,
tamil_range, MEMBERS(tamil_range)
},
{
"TamilScriptEngineX",
PANGO_ENGINE_TYPE_SHAPE,
PANGO_RENDER_TYPE_X,
tamil_range, MEMBERS(tamil_range)
}
};
static gint n_script_engines = MEMBERS (script_engines);
/*
* Language script engine
*/
static void
tamil_engine_break (gchar *text,
gint len,
PangoAnalysis *analysis,
PangoLogAttr *attrs)
{
/* Most of the code comes from pango_break
* only difference is char stop based on modifiers
*/
gchar *cur = text;
gchar *next;
gint i = 0;
GUChar4 wc;
while (*cur)
{
if (!_pango_utf8_iterate (cur, &next, &wc))
return;
if (cur == next)
break;
if ((next - text) > len)
break;
cur = next;
attrs[i].is_white = (wc == ' ' || wc == '\t' || wc == 'n') ? 1 : 0;
attrs[i].is_break = (i > 0 && attrs[i-1].is_white) || attrs[i].is_white;
attrs[i].is_char_stop = (is_uni_modi(wc)) ? 0 : 1;
attrs[i].is_word_stop = (i == 0) || attrs[i-1].is_white;
i++;
}
}
static PangoEngine *
tamil_engine_lang_new ()
{
PangoEngineLang *result;
result = g_new (PangoEngineLang, 1);
result->engine.id = "TamilScriptEngine";
result->engine.type = PANGO_ENGINE_TYPE_LANG;
result->engine.length = sizeof (result);
result->script_break = tamil_engine_break;
return (PangoEngine *)result;
}
/*
* X window system script engine portion
*/
/* We will need some type of kerning support for use with ikaram/iikaaram.
* But we can live with this for time being
*/
static void
set_glyph (PangoGlyphString *glyphs, gint i, PangoCFont *cfont, PangoGlyphIndex glyph)
{
gint width;
glyphs->glyphs[i].font = cfont;
glyphs->glyphs[i].glyph = glyph;
glyphs->geometry[i].x_offset = 0;
glyphs->geometry[i].y_offset = 0;
glyphs->log_clusters[i] = i;
pango_x_glyph_extents (&glyphs->glyphs[i],
NULL, NULL, &width, NULL, NULL, NULL, NULL);
glyphs->geometry[i].width = width * 72;
}
static void
tamil_engine_shape (PangoFont *font,
gchar *text,
gint length,
PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
int n_chars, n_glyph;
int i, j;
char *p, *next;
GUChar4 *wc, *uni_str;
int res;
unsigned char tsc_str[6];
int ntsc, nuni;
PangoCFont *tscii_font = NULL;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
tscii_font = pango_x_find_cfont (font, "tscii-0");
pango_cfont_ref (tscii_font);
n_chars = _pango_utf8_len (text, length);
/* temporarily set the size to 3 times the number of unicode chars */
pango_glyph_string_set_size (glyphs, n_chars * 3);
wc = (GUChar4 *)g_malloc(sizeof(GUChar4)*n_chars);
p = text;
for (i=0; i < n_chars; i++)
{
_pango_utf8_iterate (p, &next, &wc[i]);
p = next;
}
n_glyph = 0;
uni_str = wc;
j = 0;
while (j < n_chars)
{
res = uni2tsc(uni_str, tsc_str, &nuni, &ntsc, n_chars - j, 6);
uni_str = uni_str + nuni;
/* We need to differentiate between different return codes later */
if (res != TA_SUCCESS)
{
set_glyph (glyphs, n_glyph, tscii_font, ' ');
n_glyph++;
j = j + nuni;
continue;
}
for (i = 0; i < ntsc; i++)
{
set_glyph (glyphs, n_glyph, tscii_font, (PangoGlyphIndex) tsc_str[i]);
n_glyph++;
}
j = j + nuni;
}
pango_glyph_string_set_size (glyphs, n_glyph);
if (tscii_font)
pango_cfont_unref (tscii_font);
g_free(wc);
}
static PangoEngine *
tamil_engine_x_new ()
{
PangoEngineShape *result;
result = g_new (PangoEngineShape, 1);
result->engine.id = "TamilScriptEngine";
result->engine.type = PANGO_ENGINE_TYPE_LANG;
result->engine.length = sizeof (result);
result->script_shape = tamil_engine_shape;
return (PangoEngine *)result;
}
/* The following three functions provide the public module API for
* Pango
*/
void
script_engine_list (PangoEngineInfo **engines, gint *n_engines)
{
*engines = script_engines;
*n_engines = n_script_engines;
}
PangoEngine *
script_engine_load (const char *id)
{
if (!strcmp (id, "TamilScriptEngineLang"))
return tamil_engine_lang_new ();
else if (!strcmp (id, "TamilScriptEngineX"))
return tamil_engine_x_new ();
else
return NULL;
}
void
script_engine_unload (PangoEngine *engine)
{
}
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