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/* Pango - Arabic module
* arabic module
*
* (C) 2000 Karl Koehler<koehler@or.uni-bonn.de>
* Owen Taylor <otaylor@redhat.com>
*
*/
#include <stdio.h>
#include <glib.h>
#include <string.h>
#include "pango.h"
#include "pangox.h"
#include "arconv.h"
#include "mulefont.h"
#include "langboxfont.h"
#include "naqshfont.h"
/* #define DEBUG */
#ifdef DEBUG
#include <stdio.h>
#endif
static PangoEngineRange arabic_range[] = {
{ 0x060B, 0x06D3, "*" } /* 0x060B, 0x06D3 */
};
static PangoEngineInfo script_engines[] = {
{
"ArabicScriptEngineX",
PANGO_ENGINE_TYPE_SHAPE,
PANGO_RENDER_TYPE_X,
arabic_range, G_N_ELEMENTS(arabic_range)
}
};
static gint n_script_engines = G_N_ELEMENTS (script_engines);
/*
* X window system script engine portion
*/
static ArabicFontInfo*
arabic_unicodeinit(PangoFont *font, PangoXSubfont subfont)
{
ArabicFontInfo *fs = NULL;
if (subfont != 0)
{
if ( pango_x_has_glyph /* Alif-Madda */
(font,PANGO_X_MAKE_GLYPH(subfont,0xFE81)))
{
fs = g_new (ArabicFontInfo,1);
fs->level = ar_standard | ar_unifont;
fs->subfonts[0] = subfont;
if ( pango_x_has_glyph /* Shadda+Kasra */
(font,PANGO_X_MAKE_GLYPH(subfont,0xFC62)))
{
fs->level |= ar_composedtashkeel;
/* extra vowels in font, hopefully */
}
if ( pango_x_has_glyph /* Lam-Min alone */
(font,PANGO_X_MAKE_GLYPH(subfont,0xFC42)))
{
fs->level |= ar_lig;
/* extra ligatures in font, hopefully */
}
}
}
return fs;
}
static ArabicFontInfo*
find_unic_font (PangoFont *font)
{
static char *charsets[] = {
"iso10646-1",
"iso8859-6.8x",
"mulearabic-2",
"urdunaqsh-0",
/* "symbol-0" */
};
ArabicFontInfo *fs = NULL;
PangoXSubfont *subfonts;
int *subfont_charsets;
int n_subfonts;
int i;
GQuark info_id = g_quark_from_string ("arabic-font-info");
fs = g_object_get_qdata (G_OBJECT (font), info_id);
if (fs) return fs;
n_subfonts = pango_x_list_subfonts (font, charsets, 4,
&subfonts, &subfont_charsets);
for (i=0; i < n_subfonts; i++)
{
if ( !strcmp (charsets[subfont_charsets[i]], "mulearabic-2"))
{
#ifdef DEBUG
if (getenv("PANGO_AR_NOMULEFONT") == NULL )
#endif
fs = arabic_muleinit(font);
}
else if ( !strcmp (charsets[subfont_charsets[i]], "iso8859-6.8x"))
{
#ifdef DEBUG
if (getenv("PANGO_AR_NOLBOXFONT") == NULL )
#endif
fs = arabic_lboxinit(font);
}
else if ( !strcmp (charsets[subfont_charsets[i]], "urdunaqsh-0"))
{
#ifdef DEBUG
if (getenv("PANGO_AR_NONQFONT") == NULL )
#endif
fs = urdu_naqshinit(font);
}
else
{
#ifdef DEBUG
if (getenv("PANGO_AR_NOUNIFONT") == NULL )
#endif
fs = arabic_unicodeinit(font,subfonts[i]);
}
if (fs){
g_object_set_qdata_full (G_OBJECT (font), info_id,
fs, (GDestroyNotify)g_free);
break;
}
}
g_free (subfonts);
g_free (subfont_charsets);
return fs;
}
static void
set_glyph (PangoGlyphString *glyphs,
PangoFont *font, PangoXSubfont subfont,
int i, int cluster_start, int glyph, int is_vowel)
{
PangoRectangle logical_rect;
glyphs->glyphs[i].glyph = PANGO_X_MAKE_GLYPH (subfont, glyph);
glyphs->glyphs[i].geometry.x_offset = 0;
glyphs->glyphs[i].geometry.y_offset = 0;
pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph, NULL, &logical_rect);
glyphs->log_clusters[i] = cluster_start;
if (is_vowel)
{
glyphs->glyphs[i].geometry.width = 0;
}
else
{
glyphs->glyphs[i].geometry.width = logical_rect.width;
}
}
/* The following thing is actually critical ... */
static void
arabic_engine_shape (PangoFont *font,
const char *text,
int length,
PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
PangoXSubfont subfont;
int n_chars;
int i;
ArabicFontInfo *fs;
const char *p;
const char *pold;
gunichar *wc;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
/* We hope there is a suitible font installed ..
*/
if (! (fs = find_unic_font (font)) )
{
PangoGlyph unknown_glyph = pango_x_get_unknown_glyph (font);
n_chars = g_utf8_strlen(text,length);
pango_glyph_string_set_size (glyphs, n_chars);
p = text;
for (i=0; i<n_chars; i++)
{
set_glyph (glyphs, font,
PANGO_X_GLYPH_SUBFONT (unknown_glyph), i,
p - text, PANGO_X_GLYPH_INDEX (unknown_glyph),0);
p = g_utf8_next_char (p);
}
return;
}
p = text;
if (analysis->level % 2 == 0)
{
wc = g_utf8_to_ucs4(text,length);
n_chars = g_utf8_strlen(text,length);
/* We were called on a LTR directional run (e.g. some numbers);
fallback as simple as possible */
pango_glyph_string_set_size (glyphs, n_chars);
}
else
{
wc = (gunichar *)g_malloc(sizeof(gunichar)* (length) ); /* length is succicient: all arabic chars use at
least 2 bytes in utf-8 encoding */
n_chars = length;
arabic_reshape(&n_chars,text,wc,fs->level);
pango_glyph_string_set_size (glyphs, n_chars);
};
p = text;
pold = p;
i = 0;
subfont = fs->subfonts[0];
while(i < n_chars)
{
if (wc[i] == 0)
{
p = g_utf8_next_char (p);
#ifdef DEBUG
fprintf(stderr,"NULL-character detected in generated string.!");
#endif
i++;
}
else
{
int cluster_start ;
int is_vowel = arabic_isvowel(wc[i]);
cluster_start = is_vowel ? pold - text : p - text;
if ( fs->level & ar_mulefont )
{
arabic_mule_recode(&subfont,&(wc[i]),
fs->subfonts);
}
else if ( fs->level & ar_lboxfont )
{
if (( i < n_chars-1 )&&(wc[i+1] == 0))
{
arabic_lbox_recode(&subfont,&(wc[i]),
&(wc[i+1]),
fs->subfonts);
}
else
arabic_lbox_recode(&subfont,&(wc[i]),NULL,
fs->subfonts);
}
else if ( fs->level & ar_naqshfont )
{
if (( i < n_chars-1 )&&(wc[i+1] == 0))
{
urdu_naqsh_recode(&subfont,&(wc[i]),
&(wc[i+1]),
fs->subfonts);
}
else
urdu_naqsh_recode(&subfont,&(wc[i]),NULL,
fs->subfonts);
}
set_glyph(glyphs, font, subfont, n_chars - i - 1,
cluster_start, wc[i], is_vowel);
pold = p;
p = g_utf8_next_char (p);
i++;
}
}
g_free(wc);
}
static PangoCoverage *
arabic_engine_get_coverage (PangoFont *font,
const char *lang)
{
gunichar i;
PangoCoverage *result = pango_coverage_new ();
for (i = 0x60B; i <= 0x66D; i++)
pango_coverage_set (result, i, PANGO_COVERAGE_EXACT);
for (i = 0x670; i <= 0x6D3; i++)
pango_coverage_set (result, i, PANGO_COVERAGE_EXACT);
return result;
}
static PangoEngine *
arabic_engine_x_new ()
{
PangoEngineShape *result;
result = g_new (PangoEngineShape, 1);
result->engine.id = "ArabicScriptEngine";
result->engine.type = PANGO_ENGINE_TYPE_SHAPE;
result->engine.length = sizeof (result);
result->script_shape = arabic_engine_shape;
result->get_coverage = arabic_engine_get_coverage;
return (PangoEngine *)result;
}
/* The following three functions provide the public module API for
* Pango
*/
#ifdef MODULE_PREFIX
#define MODULE_ENTRY(func) _pango_arabic_##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, "ArabicScriptEngineX"))
return arabic_engine_x_new ();
else
return NULL;
}
void
MODULE_ENTRY(script_engine_unload) (PangoEngine *engine)
{
}
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