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

This commit is contained in:
Behdad Esfahbod 2023-01-15 13:54:27 -07:00
parent 40a8145acc
commit 8a6ecc5c89
1 changed files with 39 additions and 0 deletions
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39
util/font-options.hh
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@ -56,6 +56,7 @@ struct font_options_t : face_options_t
void post_parse (GError **error);
hb_bool_t sub_font = false;
hb_bool_t list_features = false;
#ifndef HB_NO_VAR
hb_bool_t list_variations = false;
hb_variation_t *variations = nullptr;
@ -89,6 +90,7 @@ static struct supported_font_funcs_t {
};
static G_GNUC_NORETURN void _list_features (hb_face_t *face);
#ifndef HB_NO_VAR
static G_GNUC_NORETURN void _list_variations (hb_face_t *face);
#endif
@ -164,12 +166,48 @@ font_options_t::post_parse (GError **error)
hb_font_destroy (old_font);
}
if (list_features)
_list_features (face);
#ifndef HB_NO_VAR
if (list_variations)
_list_variations (face);
#endif
}
static G_GNUC_NORETURN void
_list_features (hb_face_t *face)
{
hb_set_t *features = hb_set_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++)
{
hb_tag_t feature_array[32];
unsigned feature_count = sizeof feature_array / sizeof feature_array[0];
unsigned start_offset = 0;
do
{
hb_ot_layout_table_get_feature_tags (face, table_tags[i],
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]);
}
while (feature_count == sizeof feature_array / sizeof feature_array[0]);
}
for (hb_codepoint_t tag = HB_SET_VALUE_INVALID;
hb_set_next (features, &tag);)
{
printf ("%c%c%c%c\n", HB_UNTAG (tag));
}
exit (0);
}
#ifndef HB_NO_VAR
static G_GNUC_NORETURN void
@ -376,6 +414,7 @@ font_options_t::add_options (option_parser_t *parser)
{"sub-font", 0, G_OPTION_FLAG_HIDDEN,
G_OPTION_ARG_NONE, &this->sub_font, "Create a sub-font (default: false)", "boolean"},
{"ft-load-flags", 0, 0, G_OPTION_ARG_INT, &this->ft_load_flags, "Set FreeType load-flags (default: 2)", "integer"},
{"list-features", 0, 0, G_OPTION_ARG_NONE, &this->list_features, "List available font features and quit", nullptr},
{nullptr}
};
parser->add_group (entries,