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[face-builder] Implement get_table_tags func

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Part of https://github.com/harfbuzz/harfbuzz/issues/4821
This commit is contained in:
Behdad Esfahbod 2024-08-06 07:39:10 -06:00
parent ff04f28b23
commit 76770eb00f
1 changed files with 51 additions and 3 deletions
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54
src/hb-face-builder.cc
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@ -153,6 +153,47 @@ _hb_face_builder_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void
return hb_blob_reference (data->tables[tag].data);
}
static unsigned
_hb_face_builder_get_table_tags (const hb_face_t *face HB_UNUSED,
unsigned int start_offset,
unsigned int *table_count,
hb_tag_t *table_tags,
void *user_data)
{
hb_face_builder_data_t *data = (hb_face_builder_data_t *) user_data;
unsigned population = data->tables.get_population ();
if (!table_count)
return population;
if (unlikely (start_offset >= population))
{
if (table_count)
*table_count = 0;
return population;
}
// Sort the tags the same way we do in reference_blob().
hb_vector_t<hb_pair_t <hb_tag_t, face_table_info_t>> sorted_entries;
data->tables.iter () | hb_sink (sorted_entries);
if (unlikely (sorted_entries.in_error ()))
{
// Not much to do...
}
sorted_entries.qsort (compare_entries);
auto array = sorted_entries.as_array ().sub_array (start_offset, table_count);
auto out = hb_array (table_tags, *table_count);
+ array.iter ()
| hb_map (hb_first)
| hb_sink (out)
;
return population;
}
/**
* hb_face_builder_create:
@ -171,9 +212,16 @@ hb_face_builder_create ()
hb_face_builder_data_t *data = _hb_face_builder_data_create ();
if (unlikely (!data)) return hb_face_get_empty ();
return hb_face_create_for_tables (_hb_face_builder_reference_table,
data,
_hb_face_builder_data_destroy);
hb_face_t *face = hb_face_create_for_tables (_hb_face_builder_reference_table,
data,
_hb_face_builder_data_destroy);
hb_face_set_get_table_tags_func (face,
_hb_face_builder_get_table_tags,
data,
nullptr);
return face;
}
/**