static hb_script_t findScriptForVerticalGlyphSubstitution(hb_face_t* face) {
static const unsigned maxCount = 32;
unsigned scriptCount = maxCount;
hb_tag_t scriptTags[maxCount];
hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, 0, &scriptCount,
scriptTags);
for (unsigned scriptIndex = 0; scriptIndex < scriptCount; ++scriptIndex) {
unsigned languageCount = maxCount;
hb_tag_t languageTags[maxCount];
hb_ot_layout_script_get_language_tags(face, HB_OT_TAG_GSUB, scriptIndex, 0,
&languageCount, languageTags);
for (unsigned languageIndex = 0; languageIndex < languageCount;
++languageIndex) {
unsigned featureIndex;
if (hb_ot_layout_language_find_feature(
face, HB_OT_TAG_GSUB, scriptIndex, languageIndex,
HarfBuzzFace::vertTag, &featureIndex) ||
hb_ot_layout_language_find_feature(
face, HB_OT_TAG_GSUB, scriptIndex, languageIndex,
HarfBuzzFace::vrt2Tag, &featureIndex))
return hb_ot_tag_to_script(scriptTags[scriptIndex]);
}
}
return HB_SCRIPT_INVALID;
}
static hb_script_t findScriptForVerticalGlyphSubstitution(hb_face_t* face)
{
static const unsigned maxCount = 32;
unsigned scriptCount = maxCount;
hb_tag_t scriptTags[maxCount];
hb_ot_layout_table_get_script_tags(face, HB_OT_TAG_GSUB, 0, &scriptCount, scriptTags);
for (unsigned scriptIndex = 0; scriptIndex < scriptCount; ++scriptIndex) {
unsigned languageCount = maxCount;
hb_tag_t languageTags[maxCount];
hb_ot_layout_script_get_language_tags(face, HB_OT_TAG_GSUB, scriptIndex, 0, &languageCount, languageTags);
unsigned featureIndex;
for (unsigned languageIndex = 0; languageIndex < languageCount; ++languageIndex) {
if (hb_ot_layout_language_find_feature(face, HB_OT_TAG_GSUB, scriptIndex, languageIndex, HarfBuzzFace::vertTag, &featureIndex))
return hb_ot_tag_to_script(scriptTags[scriptIndex]);
}
// Try DefaultLangSys if all LangSys failed.
if (hb_ot_layout_language_find_feature(face, HB_OT_TAG_GSUB, scriptIndex, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX, HarfBuzzFace::vertTag, &featureIndex))
return hb_ot_tag_to_script(scriptTags[scriptIndex]);
}
return HB_SCRIPT_INVALID;
}
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;
}
static void
_hb_ot_layout_collect_lookups_features (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
const hb_tag_t *features,
hb_set_t *lookup_indexes /* OUT */)
{
if (!features)
{
unsigned int required_feature_index;
if (hb_ot_layout_language_get_required_feature (face,
table_tag,
script_index,
language_index,
&required_feature_index,
NULL))
_hb_ot_layout_collect_lookups_lookups (face,
table_tag,
required_feature_index,
lookup_indexes);
/* All features */
unsigned int feature_indices[32];
unsigned int offset, len;
offset = 0;
do {
len = ARRAY_LENGTH (feature_indices);
hb_ot_layout_language_get_feature_indexes (face,
table_tag,
script_index,
language_index,
offset, &len,
feature_indices);
for (unsigned int i = 0; i < len; i++)
_hb_ot_layout_collect_lookups_lookups (face,
table_tag,
feature_indices[i],
lookup_indexes);
offset += len;
} while (len == ARRAY_LENGTH (feature_indices));
}
else
{
for (; *features; features++)
{
unsigned int feature_index;
if (hb_ot_layout_language_find_feature (face,
table_tag,
script_index,
language_index,
*features,
&feature_index))
_hb_ot_layout_collect_lookups_lookups (face,
table_tag,
feature_index,
lookup_indexes);
}
}
}
