Globally cache single TexManager and TextToPath instances.

anntzer · anntzer · commit 8cb06a8ecd67 · 2019-01-05T23:41:30.000+01:00
This allows sharing their caches across renderer instances.

(If it was up to me these classes would be replaced by module-level
functions and a module-level cache, but heh.)
diff --git a/lib/matplotlib/texmanager.py b/lib/matplotlib/texmanager.py
@@ -29,6 +29,7 @@
 """
 
 import copy
+import functools
 import glob
 import hashlib
 import logging
@@ -48,6 +49,8 @@
 class TexManager(object):
     """
     Convert strings to dvi files using TeX, caching the results to a directory.
+
+    Repeated calls to this constructor always return the same instance.
     """
 
     cachedir = mpl.get_cachedir()
@@ -95,6 +98,10 @@ class TexManager(object):
         ('text.latex.preamble', 'text.latex.unicode', 'text.latex.preview',
          'font.family') + tuple('font.' + n for n in font_families))
 
+    @functools.lru_cache()  # Always return the same instance.
+    def __new__(cls):
+        return object.__new__(cls)
+
     def __init__(self):
 
         if self.texcache is None:
diff --git a/lib/matplotlib/textpath.py b/lib/matplotlib/textpath.py
@@ -25,12 +25,18 @@ def _get_adobe_standard_encoding():
 
 class TextToPath(object):
     """
-    A class that convert a given text to a path using ttf fonts.
+    A class that converts strings to paths.
+
+    Repeated calls to this constructor always return the same instance.
     """
 
     FONT_SCALE = 100.
     DPI = 72
 
+    @functools.lru_cache()  # Always return the same instance.
+    def __new__(cls):
+        return object.__new__(cls)
+
     def __init__(self):
         self.mathtext_parser = MathTextParser('path')
         self._texmanager = None
