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;
}
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;
}
/**
* hb_ot_layout_collect_lookups:
*
* Since: 0.9.8
**/
void
hb_ot_layout_collect_lookups (hb_face_t *face,
hb_tag_t table_tag,
const hb_tag_t *scripts,
const hb_tag_t *languages,
const hb_tag_t *features,
hb_set_t *lookup_indexes /* OUT */)
{
if (!scripts)
{
/* All scripts */
unsigned int count = hb_ot_layout_table_get_script_tags (face,
table_tag,
0, NULL, NULL);
for (unsigned int script_index = 0; script_index < count; script_index++)
_hb_ot_layout_collect_lookups_languages (face,
table_tag,
script_index,
languages,
features,
lookup_indexes);
}
else
{
for (; *scripts; scripts++)
{
unsigned int script_index;
if (hb_ot_layout_table_find_script (face,
table_tag,
*scripts,
&script_index))
_hb_ot_layout_collect_lookups_languages (face,
table_tag,
script_index,
languages,
features,
lookup_indexes);
}
}
}
bool OpenTypeCapsSupport::supportsOpenTypeFeature(
hb_script_t script,
uint32_t tag) const
{
hb_face_t* face = hb_font_get_face(m_harfBuzzFace->getScaledFont());
ASSERT(face);
ASSERT((tag == HB_TAG('s', 'm', 'c', 'p')
|| tag == HB_TAG('c', '2', 's', 'c')
|| tag == HB_TAG('p', 'c', 'a', 'p')
|| tag == HB_TAG('c', '2', 'p', 'c')
|| tag == HB_TAG('s', 'u', 'p', 's')
|| tag == HB_TAG('s', 'u', 'b', 's')
|| tag == HB_TAG('t', 'i', 't', 'l')
|| tag == HB_TAG('u', 'n', 'i', 'c')
|| tag == HB_TAG('v', 'e', 'r', 't')));
bool result = false;
if (!hb_ot_layout_has_substitution(face))
return false;
// Get the OpenType tag(s) that match this script code
const size_t kMaxScriptTags = 4;
hb_tag_t scriptTags[kMaxScriptTags] = {
HB_TAG_NONE,
HB_TAG_NONE,
HB_TAG_NONE,
HB_TAG_NONE
};
hb_ot_tags_from_script(static_cast<hb_script_t>(script),
&scriptTags[0],
&scriptTags[1]);
// Replace the first remaining NONE with DEFAULT
for (size_t i = 0; i < kMaxScriptTags; ++i) {
if (scriptTags[i] == HB_TAG_NONE) {
scriptTags[i] = HB_OT_TAG_DEFAULT_SCRIPT;
break;
}
}
// Now check for 'smcp' under the first of those scripts that is present
const hb_tag_t kGSUB = HB_TAG('G', 'S', 'U', 'B');
for (size_t j = 0; j < kMaxScriptTags; ++j) {
if (scriptTags[j] == HB_TAG_NONE)
break;
unsigned scriptIndex;
if (hb_ot_layout_table_find_script(face,
kGSUB,
scriptTags[j],
&scriptIndex)) {
if (hb_ot_layout_language_find_feature(face, kGSUB,
scriptIndex,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
tag, nullptr)) {
result = true;
}
break;
}
}
return result;
}
