MNT: move font fallback handling into CharacterTracker

tacaswell · tacaswell · commit 7fcde53564f7 · 2022-08-09T17:46:09.000-04:00
diff --git a/lib/matplotlib/backends/_backend_pdf_ps.py b/lib/matplotlib/backends/_backend_pdf_ps.py
@@ -65,7 +65,9 @@ def __init__(self):
 
     def track(self, font, s):
         """Record that string *s* is being typeset using font *font*."""
-        self.used.setdefault(font.fname, set()).update(map(ord, s))
+        char_to_font = font._get_fontmap(s)
+        for _c, _f in char_to_font.items():
+            self.used.setdefault(_f.fname, set()).add(ord(_c))
 
     def track_glyph(self, font, glyph):
         """Record that codepoint *glyph* is being typeset using font *font*."""
