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[hb-shape/view] Print feature names in --list-features

This commit is contained in:
Behdad Esfahbod 2023-01-15 22:34:14 -07:00
parent cc6a9bfa6f
commit 32d439596d
1 changed files with 38 additions and 3 deletions
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41
util/font-options.hh
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@ -179,6 +179,8 @@ static G_GNUC_NORETURN void
_list_features (hb_face_t *face)
{
hb_set_t *features = hb_set_create ();
hb_map_t *feature_index = hb_map_create ();
hb_map_t *feature_table = hb_map_create ();
hb_tag_t table_tags[] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS, HB_TAG_NONE};
for (unsigned int i = 0; table_tags[i]; i++)
@ -192,20 +194,53 @@ _list_features (hb_face_t *face)
start_offset,
&feature_count,
feature_array);
start_offset += feature_count;
for (unsigned j = 0; j < feature_count; j++)
hb_set_add (features, feature_array[j]);
{
hb_set_add (features, feature_array[j]);
hb_map_set (feature_index, feature_array[j], start_offset + j);
hb_map_set (feature_table, feature_array[j], table_tags[i]);
}
start_offset += feature_count;
}
while (feature_count == sizeof feature_array / sizeof feature_array[0]);
}
auto language = hb_language_get_default ();
for (hb_codepoint_t tag = HB_SET_VALUE_INVALID;
hb_set_next (features, &tag);)
{
printf ("%c%c%c%c\n", HB_UNTAG (tag));
hb_ot_name_id_t label_id;
hb_ot_layout_feature_get_name_ids (face,
hb_map_get (feature_table, tag),
hb_map_get (feature_index, tag),
&label_id,
nullptr,
nullptr,
nullptr,
nullptr);
char name[64];
unsigned name_len = sizeof name;
hb_ot_name_get_utf8 (face, label_id,
language,
&name_len, name);
printf ("%c%c%c%c", HB_UNTAG (tag));
if (*name)
printf (" %s", name);
printf ("\n");
}
hb_set_destroy (features);
hb_map_destroy (feature_index);
hb_map_destroy (feature_table);
exit (0);
}