hb_tag_t
getIndFeature(XeTeXFont font, hb_tag_t script, hb_tag_t language, unsigned int index)
{
hb_tag_t rval = 0;
hb_face_t* face = hb_font_get_face(((XeTeXFontInst*)font)->getHbFont());
for (int i = 0; i < 2; ++i) {
unsigned int scriptIndex, langIndex = 0;
hb_tag_t tableTag = i == 0 ? HB_OT_TAG_GSUB : HB_OT_TAG_GPOS;
if (hb_ot_layout_table_find_script(face, tableTag, script, &scriptIndex)) {
if (hb_ot_layout_script_find_language(face, tableTag, scriptIndex, language, &langIndex) || language == 0) {
unsigned int featCount = hb_ot_layout_language_get_feature_tags(face, tableTag, scriptIndex, langIndex, 0, NULL, NULL);
hb_tag_t* featList = (hb_tag_t*) xcalloc(featCount, sizeof(hb_tag_t*));
hb_ot_layout_language_get_feature_tags(face, tableTag, scriptIndex, langIndex, 0, &featCount, featList);
if (index < featCount) {
rval = featList[index];
break;
}
index -= featCount;
}
}
}
return rval;
}
static void
_hb_ot_layout_collect_lookups_languages (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
const hb_tag_t *languages,
const hb_tag_t *features,
hb_set_t *lookup_indexes /* OUT */)
{
_hb_ot_layout_collect_lookups_features (face,
table_tag,
script_index,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
features,
lookup_indexes);
if (!languages)
{
/* All languages */
unsigned int count = hb_ot_layout_script_get_language_tags (face,
table_tag,
script_index,
0, NULL, NULL);
for (unsigned int language_index = 0; language_index < count; language_index++)
_hb_ot_layout_collect_lookups_features (face,
table_tag,
script_index,
language_index,
features,
lookup_indexes);
}
else
{
for (; *languages; languages++)
{
unsigned int language_index;
if (hb_ot_layout_script_find_language (face,
table_tag,
script_index,
*languages,
&language_index))
_hb_ot_layout_collect_lookups_features (face,
table_tag,
script_index,
language_index,
features,
lookup_indexes);
}
}
}
unsigned int
countFeatures(XeTeXFont font, hb_tag_t script, hb_tag_t language)
{
unsigned int rval = 0;
hb_face_t* face = hb_font_get_face(((XeTeXFontInst*)font)->getHbFont());
for (int i = 0; i < 2; ++i) {
unsigned int scriptIndex, langIndex = 0;
hb_tag_t tableTag = i == 0 ? HB_OT_TAG_GSUB : HB_OT_TAG_GPOS;
if (hb_ot_layout_table_find_script(face, tableTag, script, &scriptIndex)) {
if (hb_ot_layout_script_find_language(face, tableTag, scriptIndex, language, &langIndex) || language == 0) {
rval += hb_ot_layout_language_get_feature_tags(face, tableTag, scriptIndex, langIndex, 0, NULL, NULL);
}
}
}
return rval;
}
