diff --git a/src/uharfbuzz/_harfbuzz.pyx b/src/uharfbuzz/_harfbuzz.pyx
index 0f6aca7..1ffcd26 100644
--- a/src/uharfbuzz/_harfbuzz.pyx
+++ b/src/uharfbuzz/_harfbuzz.pyx
@@ -1335,6 +1335,25 @@ def ot_layout_get_baseline(font: Font,
     else:
         return None
 
+def ot_layout_has_glyph_classes(face: Face) -> bool:
+    return hb_ot_layout_has_glyph_classes(face._hb_face)
+
+def ot_layout_has_positioning(face: Face) -> bool:
+    return hb_ot_layout_has_positioning(face._hb_face)
+
+def ot_layout_has_substitution(face: Face) -> bool:
+    return hb_ot_layout_has_substitution(face._hb_face)
+
+class OTLayoutGlyphClass(IntEnum):
+    UNCLASSIFIED = HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED
+    BASE_GLYPH = HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH
+    LIGATURE = HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE
+    MARK = HB_OT_LAYOUT_GLYPH_CLASS_MARK
+    COMPONENT = HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT
+
+def ot_layout_get_glyph_class(face: Face, glyph: int) -> OTLayoutGlyphClass:
+    return OTLayoutGlyphClass(hb_ot_layout_get_glyph_class(face._hb_face, glyph))
+
 
 def ot_color_has_palettes(face: Face) -> bool:
     return hb_ot_color_has_palettes(face._hb_face)
diff --git a/src/uharfbuzz/charfbuzz.pxd b/src/uharfbuzz/charfbuzz.pxd
index d7a7c1c..90e96d7 100644
--- a/src/uharfbuzz/charfbuzz.pxd
+++ b/src/uharfbuzz/charfbuzz.pxd
@@ -939,6 +939,18 @@ cdef extern from "hb-ot.h":
         hb_tag_t language_tag,
         hb_position_t* coord)  # out
 
+    hb_bool_t hb_ot_layout_has_glyph_classes(hb_face_t *face)
+    hb_bool_t hb_ot_layout_has_positioning(hb_face_t *face)
+    hb_bool_t hb_ot_layout_has_substitution(hb_face_t *face)
+
+    ctypedef enum hb_ot_layout_glyph_class_t:
+        HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED
+        HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH
+        HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE
+        HB_OT_LAYOUT_GLYPH_CLASS_MARK
+        HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT
+    hb_ot_layout_glyph_class_t hb_ot_layout_get_glyph_class(hb_face_t *face, hb_codepoint_t glyph)
+
     # hb-ot-font.h
     void hb_ot_font_set_funcs(hb_font_t* font)
 
diff --git a/tests/test_uharfbuzz.py b/tests/test_uharfbuzz.py
index f023951..aedbf8a 100644
--- a/tests/test_uharfbuzz.py
+++ b/tests/test_uharfbuzz.py
@@ -957,7 +957,7 @@ def message(self, message):
         pass
 
 
-class TestGetBaseline:
+class TestOTLayout:
     # The test font contains a BASE table with some test values
     def test_ot_layout_get_baseline_invalid_tag(self, blankfont):
         with pytest.raises(ValueError):
@@ -994,8 +994,6 @@ def test_ot_layout_get_baseline(
         )
         assert value == expected_value
 
-
-class TestGetTags:
     def test_ot_layout_language_get_feature_tags(self, blankfont):
         tags = hb.ot_layout_language_get_feature_tags(blankfont.face, "GPOS")
         assert tags == ["kern"]
@@ -1010,13 +1008,33 @@ def test_ot_layout_script_get_language_tags(self, blankfont):
         tags = hb.ot_layout_script_get_language_tags(blankfont.face, "GPOS", 0)
         assert tags == []
 
-
-class TestGetAlternates:
     def test_ot_layout_lookup_get_glyph_alternates(self, blankfont):
         gid = blankfont.get_nominal_glyph(ord("c"))
         alternates = hb.ot_layout_lookup_get_glyph_alternates(blankfont.face, 1, gid)
         assert alternates == [1]
 
+    def test_ot_layout_has_glyph_classes(self, opensans):
+        assert hb.ot_layout_has_glyph_classes(opensans.face)
+
+    def test_ot_layout_has_no_glyph_classes(self, blankfont):
+        assert hb.ot_layout_has_glyph_classes(blankfont.face) == False
+
+    def test_ot_layout_get_glyph_class(self, opensans):
+        glyph_class = hb.ot_layout_get_glyph_class(opensans.face, 1)
+        assert glyph_class == hb.OTLayoutGlyphClass.BASE_GLYPH
+
+    def test_ot_layout_has_positioning(self, opensans):
+        assert hb.ot_layout_has_positioning(opensans.face)
+
+    def test_ot_layout_has_no_positioning(self, mathfont):
+        assert hb.ot_layout_has_positioning(mathfont.face) == False
+
+    def test_ot_layout_has_substitution(self, opensans):
+        assert hb.ot_layout_has_substitution(opensans.face)
+
+    def test_ot_layout_has_no_substitution(self, mathfont):
+        assert hb.ot_layout_has_substitution(mathfont.face) == False
+
 
 class TestOTColor:
     def test_ot_color_has_palettes(self, colorv0font):