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Add hb_face_get_table_tags() 

New API:
hb_face_get_table_tags()

Fixes https://github.com/behdad/harfbuzz/issues/560
This commit is contained in:
Behdad Esfahbod 2017-10-11 17:22:44 +02:00
parent e1b6d92302
commit 94b3cafc3a
3 changed files with 52 additions and 0 deletions
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29
src/hb-face.cc
View File

@ -474,4 +474,33 @@ hb_face_t::load_num_glyphs (void) const
hb_blob_destroy (maxp_blob);
}
/**
* hb_face_get_table_tags:
* @face: a face.
*
* Retrieves table tags for a face, if possible.
*
* Return value: total number of tables, or 0 if not possible to list.
*
* Since: 1.6.0
**/
unsigned int
hb_face_get_table_tags (hb_face_t *face,
unsigned int start_offset,
unsigned int *table_count, /* IN/OUT */
hb_tag_t *table_tags /* OUT */)
{
if (face->destroy != _hb_face_for_data_closure_destroy)
{
if (table_count)
*table_count = 0;
return 0;
}
hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) face->user_data;
const OT::OpenTypeFontFile &ot_file = *OT::Sanitizer<OT::OpenTypeFontFile>::lock_instance (data->blob);
const OT::OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
return ot_face.get_table_tags (start_offset, table_count, table_tags);
}

5
src/hb-face.h
View File

@ -111,6 +111,11 @@ hb_face_set_glyph_count (hb_face_t *face,
HB_EXTERN unsigned int
hb_face_get_glyph_count (hb_face_t *face);
HB_EXTERN unsigned int
hb_face_get_table_tags (hb_face_t *face,
unsigned int start_offset,
unsigned int *table_count, /* IN/OUT */
hb_tag_t *table_tags /* OUT */);
HB_END_DECLS

18
src/hb-open-file-private.hh
View File

@ -79,6 +79,24 @@ typedef struct OffsetTable
if (unlikely (i >= numTables)) return Null(TableRecord);
return tables[i];
}
inline unsigned int get_table_tags (unsigned int start_offset,
unsigned int *table_count, /* IN/OUT */
hb_tag_t *table_tags /* OUT */) const
{
if (table_count)
{
if (start_offset >= numTables)
*table_count = 0;
else
*table_count = MIN (*table_count, numTables - start_offset);
const TableRecord *sub_tables = tables + start_offset;
unsigned int count = *table_count;
for (unsigned int i = 0; i < count; i++)
table_tags[i] = sub_tables[i].tag;
}
return numTables;
}
inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
{
Tag t;