matplotlib
diff --git a/‎lib/matplotlib/dviread.py‎
Lines changed: 35 additions & 11 deletions b/‎lib/matplotlib/dviread.py‎
Lines changed: 35 additions & 11 deletions
diff --git a/‎lib/matplotlib/textpath.py‎
Lines changed: 2 additions & 28 deletions b/‎lib/matplotlib/textpath.py‎
Lines changed: 2 additions & 28 deletions
diff --git a/‎src/ft2font_wrapper.cpp‎
Lines changed: 28 additions & 0 deletions b/‎src/ft2font_wrapper.cpp‎
Lines changed: 28 additions & 0 deletions
@@ -31,7 +31,7 @@
 
 import numpy as np
 
-from matplotlib import _api, cbook
+from matplotlib import _api, cbook, font_manager
 
 _log = logging.getLogger(__name__)
 
@@ -579,7 +579,7 @@ class DviFont:
        Size of the font in Adobe points, converted from the slightly
        smaller TeX points.
     """
-    __slots__ = ('texname', 'size', '_scale', '_vf', '_tfm')
+    __slots__ = ('texname', 'size', '_scale', '_vf', '_tfm', '_encoding')
 
     def __init__(self, scale, tfm, texname, vf):
         _api.check_isinstance(bytes, texname=texname)
@@ -588,6 +588,7 @@ def __init__(self, scale, tfm, texname, vf):
         self.texname = texname
         self._vf = vf
         self.size = scale * (72.0 / (72.27 * 2**16))
+        self._encoding = None
 
     widths = _api.deprecated("3.11")(property(lambda self: [
         (1000 * self._tfm.width.get(char, 0)) >> 20
@@ -630,6 +631,35 @@ def _height_depth_of(self, char):
             hd[-1] = 0
         return hd
 
+    # TODO: Make this public when {xe,lua}tex support is merged; simultaneously
+    # deprecate Text.glyph_name_or_index.
+    def _index_dvi_to_freetype(self, idx):
+        """Convert dvi glyph indices to FreeType ones."""
+        # Glyphs indices stored in the dvi file map to FreeType glyph indices
+        # (i.e., which can be passed to FT_Load_Glyph) in various ways:
+        # - if pdftex.map specifies an ".enc" file for the font, that file maps
+        #   dvi indices to Adobe glyph names, which can then be converted to
+        #   FreeType glyph indices with FT_Get_Name_Index.
+        # - if no ".enc" file is specified, then the font must be a Type 1
+        #   font, and dvi indices directly index into the font's CharStrings
+        #   vector.
+        # - (xetex & luatex, currently unsupported, can also declare "native
+        #   fonts", for which dvi indices are equal to FreeType indices.)
+        if self._encoding is None:
+            psfont = PsfontsMap(find_tex_file("pdftex.map"))[self.texname]
+            if psfont.filename is None:
+                raise ValueError("No usable font file found for {} ({}); "
+                                 "the font may lack a Type-1 version"
+                                 .format(psfont.psname.decode("ascii"),
+                                         psfont.texname.decode("ascii")))
+            face = font_manager.get_font(psfont.filename)
+            if psfont.encoding:
+                self._encoding = [face.get_name_index(name)
+                                  for name in _parse_enc(psfont.encoding)]
+            else:
+                self._encoding = face._get_type1_encoding_vector()
+        return self._encoding[idx]
+
 
 class Vf(Dvi):
     r"""
@@ -1023,8 +1053,7 @@ def _parse_enc(path):
     Returns
     -------
     list
-        The nth entry of the list is the PostScript glyph name of the nth
-        glyph.
+        The nth list item is the PostScript glyph name of the nth glyph.
     """
     no_comments = re.sub("%.*", "", Path(path).read_text(encoding="ascii"))
     array = re.search(r"(?s)\[(.*)\]", no_comments).group(1)
@@ -1155,15 +1184,10 @@ def _print_fields(*args):
                 print(f"font: {font.texname.decode('latin-1')} "
                       f"(scale: {font._scale / 2 ** 20}) at {fontpath}")
                 face = FT2Font(fontpath)
-                TextToPath._select_native_charmap(face)
                 _print_fields("x", "y", "glyph", "chr", "w")
                 for text in group:
-                    if psfont.encoding:
-                        glyph_name = _parse_enc(psfont.encoding)[text.glyph]
-                    else:
-                        glyph_name = face.get_glyph_name(
-                            face.get_char_index(text.glyph))
-                    glyph_str = fontTools.agl.toUnicode(glyph_name)
+                    glyph_str = fontTools.agl.toUnicode(
+                        face.get_glyph_name(font._index_dvi_to_freetype(text.glyph)))
                     _print_fields(text.x, text.y, text.glyph, glyph_str, text.width)
             if page.boxes:
                 print("--- BOXES ---")
 
@@ -238,17 +238,8 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
             if char_id not in glyph_map:
                 font.clear()
                 font.set_size(self.FONT_SCALE, self.DPI)
-                glyph_name_or_index = text.glyph_name_or_index
-                if isinstance(glyph_name_or_index, str):
-                    index = font.get_name_index(glyph_name_or_index)
-                    font.load_glyph(index, flags=LoadFlags.TARGET_LIGHT)
-                elif isinstance(glyph_name_or_index, int):
-                    self._select_native_charmap(font)
-                    font.load_char(
-                        glyph_name_or_index, flags=LoadFlags.TARGET_LIGHT)
-                else:  # Should not occur.
-                    raise TypeError(f"Glyph spec of unexpected type: "
-                                    f"{glyph_name_or_index!r}")
+                idx = text.font._index_dvi_to_freetype(text.glyph)
+                font.load_glyph(idx, flags=LoadFlags.TARGET_LIGHT)
                 glyph_map_new[char_id] = font.get_path()
 
             glyph_ids.append(char_id)
@@ -269,23 +260,6 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
         return (list(zip(glyph_ids, xpositions, ypositions, sizes)),
                 glyph_map_new, myrects)
 
-    @staticmethod
-    def _select_native_charmap(font):
-        # Select the native charmap. (we can't directly identify it but it's
-        # typically an Adobe charmap).
-        for charmap_code in [
-                1094992451,  # ADOBE_CUSTOM.
-                1094995778,  # ADOBE_STANDARD.
-        ]:
-            try:
-                font.select_charmap(charmap_code)
-            except (ValueError, RuntimeError):
-                pass
-            else:
-                break
-        else:
-            _log.warning("No supported encoding in font (%s).", font.fname)
-
 
 text_to_path = TextToPath()
 
 
@@ -1431,6 +1431,32 @@ PyFT2Font_get_image(PyFT2Font *self)
     return py::array_t<unsigned char>(dims, im.get_buffer());
 }
 
+const char *PyFT2Font__get_type1_encoding_vector__doc__ = R"""(
+    Return a list mapping CharString indices of a Type 1 font to FreeType glyph indices.
+
+    Returns
+    -------
+    list[int]
+)""";
+
+static std::array<FT_UInt, 256>
+PyFT2Font__get_type1_encoding_vector(PyFT2Font *self)
+{
+    auto face = self->x->get_face();
+    auto indices = std::array<FT_UInt, 256>{};
+    for (auto i = 0; i < indices.size(); ++i) {
+        auto len = FT_Get_PS_Font_Value(face, PS_DICT_ENCODING_ENTRY, i, nullptr, 0);
+        if (len == -1) {
+            throw std::runtime_error{
+                "FT_Get_PS_Font_Value tried to access a non-existent value"};
+        }
+        auto buf = std::unique_ptr<char[]>{new char[len]};
+        FT_Get_PS_Font_Value(face, PS_DICT_ENCODING_ENTRY, i, buf.get(), len);
+        indices[i] = FT_Get_Name_Index(face, buf.get());
+    }
+    return indices;
+}
+
 static const char *
 PyFT2Font_postscript_name(PyFT2Font *self)
 {
@@ -1761,6 +1787,8 @@ PYBIND11_MODULE(ft2font, m, py::mod_gil_not_used())
              PyFT2Font_get_sfnt_table__doc__)
         .def("get_path", &PyFT2Font_get_path, PyFT2Font_get_path__doc__)
         .def("get_image", &PyFT2Font_get_image, PyFT2Font_get_image__doc__)
+        .def("_get_type1_encoding_vector", &PyFT2Font__get_type1_encoding_vector,
+             PyFT2Font__get_type1_encoding_vector__doc__)
 
         .def_property_readonly("postscript_name", &PyFT2Font_postscript_name,
                                "PostScript name of the font.")