diff --git a/util/font-options.hh b/util/font-options.hh index a465b0790..66b910180 100644 --- a/util/font-options.hh +++ b/util/font-options.hh @@ -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,