Bind hb_face_reference_table APIs

src/uharfbuzz/_harfbuzz.pyx

@@ -635,6 +635,14 @@ cdef class Face:
             raise MemoryError()
         return Blob.from_ptr(blob)
 
+    def reference_table(self, tag: str) -> Blob:
+        cdef bytes packed = tag.encode()
+        cdef hb_tag_t hb_tag = hb_tag_from_string(<char*>packed, -1)
+        cdef hb_blob_t* blob = hb_face_reference_table(self._hb_face, hb_tag)
+        if blob is NULL:
+            raise MemoryError()
+        return Blob.from_ptr(blob)
+
     @property
     def table_tags(self) -> List[str]:
         cdef unsigned int tag_count = STATIC_ARRAY_SIZE

src/uharfbuzz/charfbuzz.pxd

@@ -241,6 +241,7 @@ cdef extern from "hb.h":
         hb_bool_t replace)
     void hb_face_destroy(hb_face_t* face)
     hb_blob_t* hb_face_reference_blob(hb_face_t *face)
+    hb_blob_t* hb_face_reference_table(hb_face_t *face,hb_tag_t tag)
     hb_face_t* hb_face_reference(hb_face_t *face)
     hb_face_t* hb_face_get_empty()
     unsigned int hb_face_get_table_tags(

tests/test_uharfbuzz.py

@@ -786,6 +786,14 @@ def test_list_names_with_user_names(self, mutatorsans):
             "MutatorMathTest-Medium_Narrow_I",
         ]
 
+    def test_reference_table(self, blankfont):
+        face = blankfont.face
+        if "OS/2" in face.table_tags:
+            blob = face.reference_table("OS/2")
+            assert len(blob.data) == 96
+        if "head" in face.table_tags:
+            blob = face.reference_table("head")
+            assert len(blob.data) == 54
 
 class TestFont:
     def test_get_glyph_extents(self, opensans):