matplotlib · jklymak · Aug 13, 2020 · Jun 8, 2020 · Jun 8, 2020
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
@@ -42,7 +42,6 @@
 from matplotlib.path import Path
 from matplotlib.dates import UTC
 from matplotlib import _path
-from matplotlib import _ttconv
 from . import _backend_pdf_ps
 
 _log = logging.getLogger(__name__)
@@ -556,6 +555,52 @@ def _flush(self):
             self.compressobj = None
 
 
+def _get_pdf_charprocs(font_path, glyph_ids):
+    font = get_font(font_path, hinting_factor=1)
+    conv = 1000 / font.units_per_EM  # Conversion to PS units (1/1000's).
+    procs = {}
+    for glyph_id in glyph_ids:
+        g = font.load_glyph(glyph_id, LOAD_NO_SCALE)
+        # NOTE: We should be using round(), but instead use
+        # "(x+.5).astype(int)" to keep backcompat with the old ttconv code
+        # (this is different for negative x's).
+        d1 = (np.array([g.horiAdvance, 0, *g.bbox]) * conv + .5).astype(int)
+        v, c = font.get_path()
+        v = (v * 64).astype(int)  # Back to TrueType's internal units (1/64's).
+        # Backcompat with old ttconv code: control points between two quads are
+        # omitted if they are exactly at the midpoint between the control of
+        # the quad before and the quad after, but ttconv used to interpolate
+        # *after* conversion to PS units, causing floating point errors.  Here
+        # we reproduce ttconv's logic, detecting these "implicit" points and
+        # re-interpolating them.  Note that occasionally (e.g. with DejaVu Sans
+        # glyph "0") a point detected as "implicit" is actually explicit, and
+        # will thus be shifted by 1.
+        quads, = np.nonzero(c == 3)
+        quads_on = quads[1::2]
+        quads_mid_on = np.array(
+            sorted({*quads_on} & {*(quads - 1)} & {*(quads + 1)}), int)
+        implicit = quads_mid_on[
+            (v[quads_mid_on]  # As above, use astype(int), not // division
+             == ((v[quads_mid_on - 1] + v[quads_mid_on + 1]) / 2).astype(int))
+            .all(axis=1)]
+        if (font.postscript_name, glyph_id) in [
+                ("DejaVuSerif-Italic", 77),  # j
+                ("DejaVuSerif-Italic", 135),  # \AA
+        ]:
+            v[:, 0] -= 1  # Hard-coded backcompat (FreeType shifts glyph by 1).
+        v = (v * conv + .5).astype(int)  # As above re: truncation vs rounding.
+        v[implicit] = ((  # Fix implicit points; again, truncate.
+            (v[implicit - 1] + v[implicit + 1]) / 2).astype(int))
+        procs[font.get_glyph_name(glyph_id)] = (
+            " ".join(map(str, d1)).encode("ascii") + b" d1\n"
+            + _path.convert_to_string(
+                Path(v, c), None, None, False, None, -1,
+                # no code for quad Beziers triggers auto-conversion to cubics.
+                [b"m", b"l", b"", b"c", b"h"], True)
+            + b"f")
+    return procs
+
+
 class PdfFile:
     """PDF file object."""
 
@@ -1089,15 +1134,8 @@ def get_char_width(charcode):
                 differencesArray.append(Name(name))
                 last_c = c
 
-            # Make the charprocs array (using ttconv to generate the
-            # actual outlines)
-            try:
-                rawcharprocs = _ttconv.get_pdf_charprocs(
-                    os.fsencode(filename), glyph_ids)
-            except RuntimeError:
-                _log.warning("The PDF backend does not currently support the "
-                             "selected font.")
-                raise
+            # Make the charprocs array.
+            rawcharprocs = _get_pdf_charprocs(filename, glyph_ids)
             charprocs = {}
             for charname in sorted(rawcharprocs):
                 stream = rawcharprocs[charname]

diff --git a/lib/matplotlib/tests/baseline_images/test_figure/figure_align_labels.pdf b/lib/matplotlib/tests/baseline_images/test_figure/figure_align_labels.pdf
diff --git a/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_69.svg b/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_69.svg