/* analysis->shape_engine has the PangoEngine... */
static void
indic_engine_shape (PangoEngineShape *engine,
PangoFont *font,
const char *text,
gint length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
PangoFcFont *fc_font;
FT_Face face;
PangoOTRuleset *gsub_ruleset, *gpos_ruleset;
PangoOTBuffer *buffer;
glong i, n_chars, n_glyphs;
gulong *tags = NULL;
gunichar *wc_in = NULL, *wc_out = NULL;
glong *utf8_offsets = NULL;
glong *indices = NULL;
IndicEngineFc *indic_shape_engine = NULL;
const PangoIndicInfo *indic_info = NULL;
MPreFixups *mprefixups;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
fc_font = PANGO_FC_FONT (font);
face = pango_fc_font_lock_face (fc_font);
if (!face)
return;
indic_shape_engine = (IndicEngineFc *) engine;
indic_info = indic_shape_engine->indicInfo;
wc_in = expand_text (text, length, &utf8_offsets, &n_chars);
n_glyphs = indic_ot_reorder (wc_in, utf8_offsets, n_chars, indic_info->classTable, NULL, NULL, NULL, NULL);
wc_out = g_new (gunichar, n_glyphs);
indices = g_new (glong, n_glyphs);
tags = g_new (gulong, n_glyphs);
n_glyphs = indic_ot_reorder (wc_in, utf8_offsets, n_chars, indic_info->classTable, wc_out, indices, tags, &mprefixups);
pango_glyph_string_set_size (glyphs, n_glyphs);
buffer = pango_ot_buffer_new (fc_font);
set_glyphs(font, wc_out, tags, n_glyphs, buffer,
(indic_info->classTable->scriptFlags & SF_PROCESS_ZWJ) != 0);
/* do gsub processing */
gsub_ruleset = get_gsub_ruleset (face, indic_info);
if (gsub_ruleset != NULL)
pango_ot_ruleset_substitute (gsub_ruleset, buffer);
/* Fix pre-modifiers for some scripts before base consonant */
if (mprefixups)
{
indic_mprefixups_apply (mprefixups, buffer);
indic_mprefixups_free (mprefixups);
}
/* do gpos processing */
gpos_ruleset = get_gpos_ruleset (face, indic_info);
if (gpos_ruleset != NULL)
pango_ot_ruleset_position (gpos_ruleset, buffer);
pango_ot_buffer_output (buffer, glyphs);
/* Get the right log_clusters values */
for (i = 0; i < glyphs->num_glyphs; i += 1)
glyphs->log_clusters[i] = indices[glyphs->log_clusters[i]];
pango_fc_font_unlock_face (fc_font);
pango_ot_buffer_destroy (buffer);
g_free (tags);
g_free (indices);
g_free (wc_out);
g_free (wc_in);
g_free (utf8_offsets);
}
static void
tibetan_engine_shape (PangoEngineShape *engine,
PangoFont *font,
const char *text,
int length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
PangoFcFont *fc_font;
FT_Face face;
PangoOTRuleset *ruleset;
PangoOTBuffer *buffer;
glong n_chars;
gunichar *wcs;
const char *p;
int i;
glong syllable;
TibetanCharClass charClass;
glong cursor = 0;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
fc_font = PANGO_FC_FONT (font);
face = pango_fc_font_lock_face (fc_font);
if (!face)
return;
buffer = pango_ot_buffer_new (fc_font);
wcs = g_utf8_to_ucs4_fast (text, length, &n_chars);
p = text;
/* This loop only exits when we reach the end of a run, which may contain
* several syllables.
*/
while (cursor < n_chars)
{
syllable = find_syllable (wcs, cursor, n_chars);
/* shall we add a dotted circle?
* If in the position in which the base should be (first char in the string) there is
* a character that has the Dotted circle flag (a character that cannot be a base)
* then write a dotted circle
*/
if (get_char_class (wcs[cursor]) & CF_DOTTED_CIRCLE)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, C_DOTTED_CIRCLE), default_p, p - text);
}
/* If it encounters a digit followed by number pre combining mark, then reorder the two characters
* coeng Ro if they are present
*/
for (i = cursor; i < syllable; i += 1)
{
charClass = get_char_class (wcs[i]);
if ((charClass & CF_DIGIT )
&& ( get_char_class (wcs[i+1]) & CF_PREDIGIT))
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, C_PRE_NUMBER_MARK), pref_p, p - text);
p = g_utf8_next_char (p);
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), pref_p, p - text);
i += 1;
} else {
switch (charClass & CF_POS_MASK)
{
case CF_POS_ABOVE :
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), abvf_p, p - text);
break;
case CF_POS_AFTER :
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), pstf_p, p - text);
break;
case CF_POS_BELOW :
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
default:
/* default - any other characters */
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), default_p, p - text);
break;
} /* switch */
}
p = g_utf8_next_char (p);
} /* for */
cursor = syllable; /* move the pointer to the start of next syllable */
} /* while */
/* do gsub processing */
ruleset = get_ruleset (face);
if (ruleset != NULL)
{
pango_ot_ruleset_substitute (ruleset, buffer);
pango_ot_ruleset_position (ruleset, buffer);
}
pango_ot_buffer_output (buffer, glyphs);
g_free (wcs);
pango_ot_buffer_destroy (buffer);
pango_fc_font_unlock_face (fc_font);
}
static void
khmer_engine_shape (PangoEngineShape *engine,
PangoFont *font,
const char *text,
int length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
PangoFcFont *fc_font;
FT_Face face;
PangoOTRuleset *ruleset;
PangoOTBuffer *buffer;
glong n_chars;
gunichar *wcs;
const char *p;
int i;
glong syllable;
KhmerCharClass charClass;
glong cursor = 0;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
fc_font = PANGO_FC_FONT (font);
face = pango_fc_font_lock_face (fc_font);
if (!face)
return;
buffer = pango_ot_buffer_new (fc_font);
wcs = g_utf8_to_ucs4_fast (text, length, &n_chars);
p = text;
/* This loop only exits when we reach the end of a run, which may contain
* several syllables.
*/
while (cursor < n_chars)
{
/* write a pre vowel or the pre part of a split vowel first
* and look out for coeng + ro. RO is the only vowel of type 2, and
* therefore the only one that requires saving space before the base.
*/
glong coengRo = -1; /* There is no Coeng Ro, if found this value will change */
syllable = find_syllable (wcs, cursor, n_chars);
for (i = cursor; i < syllable; i += 1)
{
charClass = get_char_class (wcs[i]);
/* if a split vowel, write the pre part. In Khmer the pre part
* is the same for all split vowels, same glyph as pre vowel C_VOWEL_E
*/
if (charClass & CF_SPLIT_VOWEL)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, C_VOWEL_E), pref_p, p - text);
break; /* there can be only one vowel */
}
/* if a vowel with pos before write it out */
if (charClass & CF_POS_BEFORE)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), pref_p, p - text);
break; /* there can be only one vowel */
}
/* look for coeng + ro and remember position
* works because coeng + ro is always in front of a vowel (if there is a vowel)
* and because CC_CONSONANT2 is enough to identify it, as it is the only consonant
* with this flag
*/
if ((charClass & CF_COENG) && (i + 1 < syllable) &&
((get_char_class (wcs[i + 1]) & CF_CLASS_MASK) == CC_CONSONANT2))
{
coengRo = i;
}
}
/* write coeng + ro if found */
if (coengRo > -1)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, C_COENG), pref_p, p - text);
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, C_RO), pref_p, p - text);
}
/* shall we add a dotted circle?
* If in the position in which the base should be (first char in the string) there is
* a character that has the Dotted circle flag (a character that cannot be a base)
* then write a dotted circle
*/
if (get_char_class (wcs[cursor]) & CF_DOTTED_CIRCLE)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, C_DOTTED_CIRCLE), default_p, p - text);
}
/* copy what is left to the output, skipping before vowels and
* coeng Ro if they are present
*/
for (i = cursor; i < syllable; i += 1)
{
charClass = get_char_class (wcs[i]);
/* skip a before vowel, it was already processed */
if (charClass & CF_POS_BEFORE)
{
p = g_utf8_next_char (p);
continue;
}
/* skip coeng + ro, it was already processed */
if (i == coengRo)
{
p = g_utf8_next_char (p);
i += 1;
p = g_utf8_next_char (p);
continue;
}
switch (charClass & CF_POS_MASK)
{
case CF_POS_ABOVE :
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), abvf_p, p - text);
break;
case CF_POS_AFTER :
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), pstf_p, p - text);
break;
case CF_POS_BELOW :
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
default:
/* assign the correct flags to a coeng consonant
* Consonants of type 3 are taged as Post forms and those type 1 as below forms
*/
if ((charClass & CF_COENG) && i + 1 < syllable)
{
if ((get_char_class (wcs[i + 1]) & CF_CLASS_MASK) == CC_CONSONANT3)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), pstf_p, p - text);
p = g_utf8_next_char (p);
i += 1;
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), pstf_p, p - text);
break;
}
else
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
p = g_utf8_next_char (p);
i += 1;
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
}
}
/* if a shifter is followed by an above vowel change the shifter to below form,
* an above vowel can have two possible positions i + 1 or i + 3
* (position i+1 corresponds to unicode 3, position i+3 to Unicode 4)
* and there is an extra rule for C_VOWEL_AA + C_SIGN_NIKAHIT also for two
* different positions, right after the shifter or after a vowel (Unicode 4)
*/
if ((charClass & CF_SHIFTER) && (i + 1 < syllable))
{
if (get_char_class (wcs[i + 1]) & CF_ABOVE_VOWEL)
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
}
if (i + 2 < syllable &&
(wcs[i + 1] == C_VOWEL_AA) &&
(wcs[i + 2] == C_SIGN_NIKAHIT) )
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
}
if (i + 3 < syllable && (get_char_class (wcs[i + 3]) & CF_ABOVE_VOWEL) )
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
}
if (i + 4 < syllable &&
(wcs[i + 3] == C_VOWEL_AA) &&
(wcs[i + 4] == C_SIGN_NIKAHIT) )
{
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), blwf_p, p - text);
break;
}
}
/* default - any other characters */
pango_ot_buffer_add_glyph (buffer, get_index (fc_font, wcs[i]), default_p, p - text);
break;
} /* switch */
p = g_utf8_next_char (p);
} /* for */
cursor = syllable; /* move the pointer to the start of next syllable */
} /* while */
/* do gsub processing */
ruleset = get_ruleset (face);
if (ruleset != NULL)
{
pango_ot_ruleset_substitute (ruleset, buffer);
pango_ot_ruleset_position (ruleset, buffer);
}
pango_ot_buffer_output (buffer, glyphs);
g_free (wcs);
pango_ot_buffer_destroy (buffer);
pango_fc_font_unlock_face (fc_font);
}
static void
syriac_engine_shape (PangoEngineShape *engine,
PangoFont *font,
const char *text,
gint length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
PangoFcFont *fc_font;
FT_Face face;
PangoOTRulesetDescription desc;
const PangoOTRuleset *ruleset;
PangoOTBuffer *buffer;
gulong *properties = NULL;
glong n_chars;
gunichar *wcs;
const char *p;
int cluster = 0;
int i;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
fc_font = PANGO_FC_FONT (font);
face = pango_fc_font_lock_face (fc_font);
if (!face)
return;
buffer = pango_ot_buffer_new (fc_font);
pango_ot_buffer_set_rtl (buffer, analysis->level % 2 != 0);
pango_ot_buffer_set_zero_width_marks (buffer, TRUE);
wcs = g_utf8_to_ucs4_fast (text, length, &n_chars);
properties = g_new0 (gulong, n_chars);
syriac_assign_properties (wcs, properties, n_chars);
g_free (wcs);
p = text;
for (i=0; i < n_chars; i++)
{
gunichar wc;
PangoGlyph glyph;
wc = g_utf8_get_char (p);
if (g_unichar_type (wc) != G_UNICODE_NON_SPACING_MARK)
cluster = p - text;
if (pango_is_zero_width (wc))
glyph = PANGO_GLYPH_EMPTY;
else
{
gunichar c = wc;
if (analysis->level % 2)
g_unichar_get_mirror_char (c, &c);
glyph = pango_fc_font_get_glyph (fc_font, c);
}
if (!glyph)
glyph = PANGO_GET_UNKNOWN_GLYPH (wc);
pango_ot_buffer_add_glyph (buffer, glyph, properties[i], cluster);
p = g_utf8_next_char (p);
}
g_free (properties);
desc.script = analysis->script;
desc.language = analysis->language;
desc.n_static_gsub_features = G_N_ELEMENTS (gsub_features);
desc.static_gsub_features = gsub_features;
desc.n_static_gpos_features = G_N_ELEMENTS (gpos_features);
desc.static_gpos_features = gpos_features;
/* TODO populate other_features from analysis->extra_attrs */
desc.n_other_features = 0;
desc.other_features = NULL;
ruleset = pango_ot_ruleset_get_for_description (pango_ot_info_get (face), &desc);
pango_ot_ruleset_substitute (ruleset, buffer);
pango_ot_ruleset_position (ruleset, buffer);
pango_ot_buffer_output (buffer, glyphs);
pango_ot_buffer_destroy (buffer);
pango_fc_font_unlock_face (fc_font);
}
