8000 Cache various dviread constructs globally. · matplotlib/matplotlib@85fb163 · GitHub
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Cache various dviread constructs globally.
Previously, caching was done at the level of the renderer, so new renderers would have to reconstruct the PsfontsMap and Adobe encoding tables. Using a global cache greatly improves the performance: something like rcdefaults() gca().text(.5, .5, "$foo$", usetex=True) %timeit savefig("/tmp/test.svg") goes from ~187ms to ~37ms. %timeit savefig("/tmp/test.pdf") goes from ~124ms to ~53ms. Also moves TextToPath's _get_ps_font_map_and_encoding to use a standard lru_cache.
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‎doc/api/next_api_changes/2018-02-15-AL-deprecations.rst

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Original file line numberDiff line numberDiff line change
@@ -11,6 +11,7 @@ The following modules are deprecated:
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The following classes, methods, functions, and attributes are deprecated:
1212

1313
- ``afm.parse_afm``,
14+
- ``backend_pdf.PdfFile.texFontMap``,
1415
- ``backend_wx.FigureCanvasWx.macros``,
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- ``cbook.GetRealpathAndStat``, ``cbook.Locked``,
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- ``cbook.is_numlike`` (use ``isinstance(..., numbers.Number)`` instead),
@@ -20,6 +21,7 @@ The following classes, methods, functions, and attributes are deprecated:
2021
- ``font_manager.TempCache``,
2122
- ``mathtext.unichr_safe`` (use ``chr`` instead),
2223
- ``testing.ImageComparisonTest``,
24+
- ``textpath.TextToPath.tex_font_map``,
2325
- ``FigureCanvasWx.macros``,
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- ``_ImageBase.iterpnames``, use the ``interpolation_names`` property instead.
2527
(this affects classes that inherit from ``_ImageBase`` including

‎lib/matplotlib/backends/backend_pdf.py

Lines changed: 4 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -655,14 +655,11 @@ def fontName(self, fontprop):
655655
return Fx
656656

657657
@property
658+
@cbook.deprecated("3.0")
658659
def texFontMap(self):
659660
# lazy-load texFontMap, it takes a while to parse
660661
# and usetex is a relatively rare use case
661-
if self._texFontMap is None:
662-
self._texFontMap = dviread.PsfontsMap(
663-
dviread.find_tex_file('pdftex.map'))
664-
665-
return self._texFontMap
662+
return dviread.PsfontsMap(dviread.find 8000 _tex_file('pdftex.map'))
666663

667664
def dviFontName(self, dvifont):
668665
"""
@@ -675,7 +672,8 @@ def dviFontName(self, dvifont):
675672
if dvi_info is not None:
676673
return dvi_info.pdfname
677674

678-
psfont = self.texFontMap[dvifont.texname]
675+
tex_font_map = dviread.PsfontsMap(dviread.find_tex_file('pdftex.map'))
676+
psfont = tex_font_map[dvifont.texname]
679677
if psfont.filename is None:
680678
raise ValueError(
681679
"No usable font file found for {} (TeX: {}); "

‎lib/matplotlib/dviread.py

Lines changed: 13 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -15,8 +15,8 @@
1515
...
1616
for x,y,height,width in page.boxes:
1717
...
18-
1918
"""
19+
2020
from collections import namedtuple
2121
import enum
2222
from functools import lru_cache, partial, wraps
@@ -34,6 +34,10 @@
3434

3535
_log = logging.getLogger(__name__)
3636

37+
# Many dvi related files are looked for by external processes, require
38+
# additional parsing, and are used many times per rendering, which is why they
39+
# are cached using lru_cache().
40+
3741
# Dvi is a bytecode format documented in
3842
# http://mirrors.ctan.org/systems/knuth/dist/texware/dvitype.web
3943
# http://texdoc.net/texmf-dist/doc/generic/knuth/texware/dvitype.pdf
@@ -808,14 +812,14 @@ class PsfontsMap(object):
808812
"""
809813
__slots__ = ('_font', '_filename')
810814

811-
def __init__(self, filename):
815+
@lru_cache()
816+
def __new__(cls, filename):
817+
self = object.__new__(cls)
812818
self._font = {}
813-
self._filename = filename
814-
if isinstance(filename, bytes):
815-
encoding = sys.getfilesystemencoding() or 'utf-8'
816-
self._filename = filename.decode(encoding, errors='replace')
819+
self._filename = os.fsdecode(filename)
817820
with open(filename, 'rb') as file:
818821
self._parse(file)
822+
return self
819823

820824
def __getitem__(self, texname):
821825
assert isinstance(texname, bytes)
@@ -956,7 +960,8 @@ def __init__(self, filename):
956960
def __iter__(self):
957961
yield from self.encoding
958962

959-
def _parse(self, file):
963+
@staticmethod
964+
def _parse(file):
960965
result = []
961966

962967
lines = (line.split(b'%', 1)[0].strip() for line in file)
@@ -975,6 +980,7 @@ def _parse(self, file):
975980
return re.findall(br'/([^][{}<>\s]+)', data)
976981

977982

983+
@lru_cache()
978984
def find_tex_file(filename, format=None):
979985
"""
980986
Find a file in the texmf tree.
@@ -1016,10 +1022,6 @@ def find_tex_file(filename, format=None):
10161022
return result.decode('ascii')
10171023

10181024

1019-
# With multiple text objects per figure (e.g., tick labels) we may end
1020-
# up reading the same tfm and vf files many times, so we implement a
1021-
# simple cache. TODO: is this worth making persistent?
1022-
10231025
@lru_cache()
10241026
def _fontfile(cls, suffix, texname):
10251027
filename = find_tex_file(texname + suffix)

‎lib/matplotlib/texmanager.py

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -29,17 +29,13 @@
2929
"""
3030

3131
import copy
32-
import distutils.version
3332
import glob
3433
import hashlib
3534
import logging
3635
import os
3736
from pathlib import Path
3837
import re
39-
import shutil
4038
import subprocess
41-
import sys
42-
import warnings
4339

4440
import numpy as np
4541

‎lib/matplotlib/textpath.py

Lines changed: 54 additions & 66 deletions
Original file line numberDiff line numberDiff line change
@@ -1,20 +1,26 @@
11
from collections import OrderedDict
2+
import functools
23
import urllib.parse
34
import warnings
45

56
import numpy as np
67

7-
from matplotlib.path import Path
8-
from matplotlib import rcParams
9-
import matplotlib.font_manager as font_manager
10-
from matplotlib.ft2font import KERNING_DEFAULT, LOAD_NO_HINTING
11-
from matplotlib.ft2font import LOAD_TARGET_LIGHT
12-
from matplotlib.mathtext import MathTextParser
13-
import matplotlib.dviread as dviread
8+
from matplotlib import cbook, dviread, font_manager, rcParams
149
from matplotlib.font_manager import FontProperties, get_font
10+
from matplotlib.ft2font import (
11+
KERNING_DEFAULT, LOAD_NO_HINTING, LOAD_TARGET_LIGHT)
12+
from matplotlib.mathtext import MathTextParser
13+
from matplotlib.path import Path
1514
from matplotlib.transforms import Affine2D
1615

1716

17+
@functools.lru_cache(1)
18+
def _get_adobe_standard_encoding():
19+
enc_name = dviread.find_tex_file('8a.enc')
20+
enc = dviread.Encoding(enc_name)
21+
return {c: i for i, c in enumerate(enc.encoding)}
22+
23+
1824
class TextToPath(object):
1925
"""
2026
A class that convert a given text to a path using ttf fonts.
@@ -25,19 +31,11 @@ class TextToPath(object):
2531

2632
def __init__(self):
2733
self.mathtext_parser = MathTextParser('path')
28-
self.tex_font_map = None
29-
30-
from matplotlib.cbook import maxdict
31-
self._ps_fontd = maxdict(50)
32-
3334
self._texmanager = None
3435

35-
self._adobe_standard_encoding = None
36-
37-
def _get_adobe_standard_encoding(self):
38-
enc_name = dviread.find_tex_file('8a.enc')
39-
enc = dviread.Encoding(enc_name)
40-
return {c: i for i, c in enumerate(enc.encoding)}
36+
@cbook.deprecated("3.0")
37+
def tex_font_map(self):
38+
return dviread.PsfontsMap(dviread.find_tex_file('pdftex.map'))
4139

4240
def _get_font(self, prop):
4341
"""
@@ -287,13 +285,6 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
287285

288286
texmanager = self.get_texmanager()
289287

290-
if self.tex_font_map is None:
291-
self.tex_font_map = dviread.PsfontsMap(
292-
dviread.find_tex_file('pdftex.map'))
293-
294-
if self._adobe_standard_encoding is None:
295-
self._adobe_standard_encoding = self._get_adobe_standard_encoding()
296-
297288
fontsize = prop.get_size_in_points()
298289
if hasattr(texmanager, "get_dvi"):
299290
dvifilelike = texmanager.get_dvi(s, self.FONT_SCALE)
@@ -318,46 +309,7 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
318309
# characters into strings.
319310
# oldfont, seq = None, []
320311
for x1, y1, dvifont, glyph, width in page.text:
321-
font_and_encoding = self._ps_fontd.get(dvifont.texname)
322-
font_bunch = self.tex_font_map[dvifont.texname]
323-
324-
if font_and_encoding is None:
325-
if font_bunch.filename is None:
326-
raise ValueError(
327-
("No usable font file found for %s (%s). "
328-
"The font may lack a Type-1 version.")
329-
% (font_bunch.psname, dvifont.texname))
330-
331-
font = get_font(font_bunch.filename)
332-
333-
for charmap_name, charmap_code in [("ADOBE_CUSTOM",
334-
1094992451),
335-
("ADOBE_STANDARD",
336-
1094995778)]:
337-
try:
338-
font.select_charmap(charmap_code)
339-
except (ValueError, RuntimeError):
340-
pass
341-
else:
342-
break
343-
else:
344-
charmap_name = ""
345-
warnings.warn("No supported encoding in font (%s)." %
346-
font_bunch.filename)
347-
348-
if charmap_name == "ADOBE_STANDARD" and font_bunch.encoding:
349-
enc0 = dviread.Encoding(font_bunch.encoding)
350-
enc = {i: self._adobe_standard_encoding.get(c, None)
351-
for i, c in enumerate(enc0.encoding)}
352-
else:
353-
enc = {}
354-
self._ps_fontd[dvifont.texname] = font, enc
355-
356-
else:
357-
font, enc = font_and_encoding
358-
359-
ft2font_flag = LOAD_TARGET_LIGHT
360-
312+
font, enc = self._get_ps_font_and_encoding(dvifont.texname)
361313
char_id = self._get_char_id_ps(font, glyph)
362314

363315
if char_id not in glyph_map:
@@ -368,12 +320,13 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
368320
else:
369321
charcode = glyph
370322

323+
ft2font_flag = LOAD_TARGET_LIGHT
371324
if charcode is not None:
372325
glyph0 = font.load_char(charcode, flags=ft2font_flag)
373326
else:
374327
warnings.warn("The glyph (%d) of font (%s) cannot be "
375328
"converted with the encoding. Glyph may "
376-
"be wrong" % (glyph, font_bunch.filename))
329+
"be wrong" % (glyph, font.fname))
377330

378331
glyph0 = font.load_char(glyph, flags=ft2font_flag)
379332

@@ -397,6 +350,41 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
397350
return (list(zip(glyph_ids, xpositions, ypositions, sizes)),
398351
glyph_map_new, myrects)
399352

353+
@staticmethod
354+
@functools.lru_cache(50)
355+
def _get_ps_font_and_encoding(texname):
356+
tex_font_map = dviread.PsfontsMap(dviread.find_tex_file('pdftex.map'))
357+
font_bunch = tex_font_map[texname]
358+
if font_bunch.filename is None:
359+
raise ValueError(
360+
("No usable font file found for %s (%s). "
361+
"The font may lack a Type-1 version.")
362+
% (font_bunch.psname, texname))
363+
364+
font = get_font(font_bunch.filename)
365+
366+
for charmap_name, charmap_code in [("ADOBE_CUSTOM", 1094992451),
367+
("ADOBE_STANDARD", 1094995778)]:
368+
try:
369+
font.select_charmap(charmap_code)
370+
except (ValueError, RuntimeError):
371+
pass
372+
else:
373+
break
374+
else:
375+
charmap_name = ""
376+
warnings.warn("No supported encoding in font (%s)." %
377+
font_bunch.filename)
378+
379+
if charmap_name == "ADOBE_STANDARD" and font_bunch.encoding:
380+
enc0 = dviread.Encoding(font_bunch.encoding)
381+
enc = {i: _get_adobe_standard_encoding().get(c, None)
382+
for i, c in enumerate(enc0.encoding)}
383+
else:
384+
enc = {}
385+
386+
return font, enc
387+
400388

401389
text_to_path = TextToPath()
402390

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