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[hb-shape/hb-view] Better --list-features

This commit is contained in:
Behdad Esfahbod 2023-01-16 10:54:23 -07:00
parent 32d439596d
commit f25e3696eb
1 changed files with 77 additions and 44 deletions
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121
util/font-options.hh
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@ -178,69 +178,102 @@ font_options_t::post_parse (GError **error)
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};
auto language = hb_language_get_default ();
hb_set_t *features = hb_set_create ();
for (unsigned int i = 0; table_tags[i]; i++)
{
printf ("Table: %c%c%c%c\n", HB_UNTAG (table_tags[i]));
hb_tag_t script_array[32];
unsigned script_count = sizeof script_array / sizeof script_array[0];
unsigned script_offset = 0;
do
{
hb_ot_layout_table_get_script_tags (face, table_tags[i],
script_offset,
&script_count,
script_array);
for (unsigned script_index = 0; script_index < script_count; script_index++)
{
printf (" Script: %c%c%c%c\n", HB_UNTAG (script_array[script_index]));
hb_tag_t language_array[32];
unsigned language_count = sizeof language_array / sizeof language_array[0];
unsigned language_offset = 0;
do
{
hb_ot_layout_script_get_language_tags (face, table_tags[i],
script_offset + script_index,
language_offset,
&language_count,
language_array);
for (unsigned language_index = 0; language_index < language_count; language_index++)
{
printf (" Language: %c%c%c%c\n", HB_UNTAG (language_array[language_index]));
}
language_offset += language_count;
}
while (language_count == sizeof language_array / sizeof language_array[0]);
}
script_offset += script_count;
}
while (script_count == sizeof script_array / sizeof script_array[0]);
hb_tag_t feature_array[32];
unsigned feature_count = sizeof feature_array / sizeof feature_array[0];
unsigned start_offset = 0;
unsigned feature_offset = 0;
do
{
hb_ot_layout_table_get_feature_tags (face, table_tags[i],
start_offset,
feature_offset,
&feature_count,
feature_array);
for (unsigned j = 0; j < feature_count; j++)
for (unsigned feature_index = 0; feature_index < feature_count; feature_index++)
{
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]);
if (hb_set_has (features, feature_array[feature_index]))
continue;
hb_set_add (features, feature_array[feature_index]);
hb_ot_name_id_t label_id;
hb_ot_layout_feature_get_name_ids (face,
table_tags[i],
feature_offset + feature_index,
&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 (" Feature: %c%c%c%c", HB_UNTAG (feature_array[feature_index]));
if (*name)
printf (" %s", name);
printf ("\n");
}
start_offset += feature_count;
feature_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);)
{
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);
}