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[hb-info] Implement script/language-sensitive --list-features 

I'm not very confident in the implementation.
This commit is contained in:
Behdad Esfahbod 2023-01-19 18:39:32 -07:00
parent a67b6aad92
commit edd5a37e79
1 changed files with 97 additions and 9 deletions
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106
util/hb-info.cc
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@ -514,14 +514,8 @@ struct info_t
}
void
_list_features ()
_list_features_no_script ()
{
if (verbose)
{
separator ();
printf ("Layout features information:\n\n");
}
hb_tag_t table_tags[] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS, HB_TAG_NONE};
hb_set_t *features = hb_set_create ();
@ -537,8 +531,6 @@ struct info_t
unsigned feature_offset = 0;
do
{
// TODO Select features based on script/language
hb_ot_layout_table_get_feature_tags (face, table_tags[i],
feature_offset,
&feature_count,
@ -586,6 +578,102 @@ struct info_t
hb_set_destroy (features);
}
void
_list_features ()
{
if (verbose)
{
separator ();
printf ("Layout features information:\n\n");
}
hb_tag_t table_tags[] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS, HB_TAG_NONE};
if (script == HB_SCRIPT_INVALID)
{
_list_features_no_script ();
return;
}
for (unsigned int i = 0; table_tags[i]; i++)
{
if (verbose) printf ("Table: ");
printf ("%c%c%c%c\n", HB_UNTAG (table_tags[i]));
auto table_tag = table_tags[i];
hb_tag_t script_tags[HB_OT_MAX_TAGS_PER_SCRIPT];
hb_tag_t language_tags[HB_OT_MAX_TAGS_PER_LANGUAGE];
unsigned script_count = HB_OT_MAX_TAGS_PER_SCRIPT;
unsigned language_count = HB_OT_MAX_TAGS_PER_LANGUAGE;
hb_ot_tags_from_script_and_language (script, language,
&script_count, script_tags,
&language_count, language_tags);
unsigned script_index;
hb_ot_layout_table_select_script (face, table_tag,
script_count, script_tags,
&script_index, nullptr);
unsigned language_index;
hb_ot_layout_script_select_language (face, table_tag,
script_index,
language_count, language_tags,
&language_index);
unsigned feature_array[32];
unsigned feature_count = sizeof feature_array / sizeof feature_array[0];
unsigned feature_offset = 0;
do
{
hb_ot_layout_language_get_feature_indexes (face, table_tag,
script_index, language_index,
feature_offset,
&feature_count,
feature_array);
for (unsigned feature_index = 0; feature_index < feature_count; feature_index++)
{
hb_ot_name_id_t label_id;
hb_ot_layout_feature_get_name_ids (face,
table_tags[i],
feature_array[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 (" ");
if (verbose) printf ("Feature: ");
hb_tag_t feature_tag;
unsigned f_count = 1;
hb_ot_layout_table_get_feature_tags (face, table_tag,
feature_array[feature_index],
&f_count, &feature_tag);
printf ("%c%c%c%c", HB_UNTAG (feature_tag));
if (*name)
printf (" %s", name);
printf ("\n");
}
feature_offset += feature_count;
}
while (feature_count == sizeof feature_array / sizeof feature_array[0]);
}
}
#ifndef HB_NO_VAR
void
_list_variations ()