Bind hb_font_funcs_set_variation_glyph_func()

src/uharfbuzz/_harfbuzz.pyx

@@ -971,6 +971,17 @@ cdef hb_bool_t _nominal_glyph_func(hb_font_t* font, void* font_data,
     # If the glyph is .notdef, return false, else return true
     return int(glyph[0] != 0)
 
+cdef hb_bool_t _variation_glyph_func(hb_font_t* font, void* font_data,
+                                   hb_codepoint_t unicode,
+                                   hb_codepoint_t variation_selector,
+                                   hb_codepoint_t* glyph,
+                                   void* user_data) noexcept:
+    cdef Font py_font = <Font>font_data
+    glyph[0] = (<FontFuncs>py_font.funcs)._variation_glyph_func(
+        py_font, unicode, variation_selector, <object>user_data)
+    # If the glyph is .notdef, return false, else return true
+    return int(glyph[0] != 0)
+
 
 cdef hb_bool_t _font_h_extents_func(hb_font_t* font, void* font_data,
                                     hb_font_extents_t *extents,
@@ -1013,6 +1024,7 @@ cdef class FontFuncs:
     cdef object _glyph_v_origin_func
     cdef object _glyph_name_func
     cdef object _nominal_glyph_func
+    cdef object _variation_glyph_func
     cdef object _font_h_extents_func
     cdef object _font_v_extents_func
 
@@ -1083,6 +1095,18 @@ cdef class FontFuncs:
             self._hb_ffuncs, _nominal_glyph_func, <void*>user_data, NULL)
         self._nominal_glyph_func = func
 
+    def set_variation_glyph_func(self,
+                               func: Callable[[
+                                   Font,
+                                   int,  # unicode
+                                   int,  # variation_selector
+                                   object,  # user_data
+                               ], int],  # gid
+                               user_data: object = None) -> None:
+        hb_font_funcs_set_variation_glyph_func(
+            self._hb_ffuncs, _variation_glyph_func, <void*>user_data, NULL)
+        self._variation_glyph_func = func
+
     def set_font_h_extents_func(self,
                                 func: Callable[[
                                     Font,

src/uharfbuzz/charfbuzz.pxd

@@ -252,6 +252,12 @@ cdef extern from "hb.h":
         hb_codepoint_t unicode,
         hb_codepoint_t* glyph,
         void* user_data)
+    ctypedef hb_bool_t (*hb_font_get_variation_glyph_func_t) (
+        hb_font_t *font, void *font_data,
+        hb_codepoint_t unicode,
+        hb_codepoint_t variation_selector,
+        hb_codepoint_t *glyph,
+        void *user_data)
     ctypedef hb_position_t (*hb_font_get_glyph_advance_func_t) (
         hb_font_t* font, void* font_data,
         hb_codepoint_t glyph,
@@ -313,6 +319,10 @@ cdef extern from "hb.h":
         hb_font_funcs_t* ffuncs,
         hb_font_get_nominal_glyph_func_t func,
         void* user_data, hb_destroy_func_t destroy)
+    void hb_font_funcs_set_variation_glyph_func(
+        hb_font_funcs_t *ffuncs,
+        hb_font_get_variation_glyph_func_t func,
+        void *user_data, hb_destroy_func_t destroy)
     void hb_font_funcs_set_font_h_extents_func(
         hb_font_funcs_t *ffuncs,
         hb_font_get_font_h_extents_func_t func,

tests/test_uharfbuzz.py

@@ -487,6 +487,24 @@ def nominal_glyph_func(font, code_point, data):
         infos = [g.codepoint for g in buf.glyph_infos]
         assert infos == expected
 
+    def test_variation_glyph_func(self, blankfont):
+        string = "a\uFE00"
+        expected = [ord("a") + 0xFE00]
+        buf = hb.Buffer()
+        buf.add_str(string)
+        buf.guess_segment_properties()
+
+        def variation_glyph_func(font, unicode, variation_selector, data):
+            return unicode + variation_selector
+
+        funcs = hb.FontFuncs.create()
+        funcs.set_variation_glyph_func(variation_glyph_func)
+        blankfont.funcs = funcs
+
+        hb.shape(blankfont, buf)
+        infos = [g.codepoint for g in buf.glyph_infos]
+        assert infos == expected
+
     def test_glyph_h_advance_func(self, blankfont):
         string = "abcde"
         expected = [456, 456, 456, 456, 456]