matplotlib/lib/matplotlib/font_manager.py at v3.1.x · matplotlib/matplotlib · GitHub

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"""

A module for finding, managing, and using fonts across platforms.

This module provides a single :class:`FontManager` instance that can

be shared across backends and platforms. The :func:`findfont`

function returns the best TrueType (TTF) font file in the local or

system font path that matches the specified :class:`FontProperties`

instance. The :class:`FontManager` also handles Adobe Font Metrics

(AFM) font files for use by the PostScript backend.

The design is based on the `W3C Cascading Style Sheet, Level 1 (CSS1)

font specification <http://www.w3.org/TR/1998/REC-CSS2-19980512/>`_.

Future versions may implement the Level 2 or 2.1 specifications.

"""

# KNOWN ISSUES

# - documentation

# - font variant is untested

# - font stretch is incomplete

# - font size is incomplete

# - default font algorithm needs improvement and testing

# - setWeights function needs improvement

# - 'light' is an invalid weight value, remove it.

from functools import lru_cache

import json

import logging

from numbers import Number

import os

from pathlib import Path

import subprocess

import sys

try:

from threading import Timer

except ImportError:

from dummy_threading import Timer

import matplotlib as mpl

from matplotlib import afm, cbook, ft2font, rcParams

from matplotlib.fontconfig_pattern import (

parse_fontconfig_pattern, generate_fontconfig_pattern)

_log = logging.getLogger(__name__)

font_scalings = {

'xx-small' : 0.579,

'x-small' : 0.694,

'small' : 0.833,

'medium' : 1.0,

'large' : 1.200,

'x-large' : 1.440,

'xx-large' : 1.728,

'larger' : 1.2,

'smaller' : 0.833,

None : 1.0}

stretch_dict = {

'ultra-condensed' : 100,

'extra-condensed' : 200,

'condensed' : 300,

'semi-condensed' : 400,

'normal' : 500,

'semi-expanded' : 600,

'expanded' : 700,

'extra-expanded' : 800,

'ultra-expanded' : 900}

weight_dict = {

'ultralight' : 100,

'light' : 200,

'normal' : 400,

'regular' : 400,

'book' : 400,

'medium' : 500,

'roman' : 500,

'semibold' : 600,

'demibold' : 600,

'demi' : 600,

'bold' : 700,

'heavy' : 800,

'extra bold' : 800,

'black' : 900}

font_family_aliases = {

'serif',

'sans-serif',

'sans serif',

'cursive',

'fantasy',

'monospace',

'sans'}

# OS Font paths

MSFolders = \

r'Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders'

MSFontDirectories = [

r'SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts',

r'SOFTWARE\Microsoft\Windows\CurrentVersion\Fonts']

MSUserFontDirectories = [

os.path.join(str(Path.home()), r'AppData\Local\Microsoft\Windows\Fonts'),

os.path.join(str(Path.home()), r'AppData\Roaming\Microsoft\Windows\Fonts')]

X11FontDirectories = [

# an old standard installation point

"/usr/X11R6/lib/X11/fonts/TTF/",

"/usr/X11/lib/X11/fonts",

# here is the new standard location for fonts

"/usr/share/fonts/",

# documented as a good place to install new fonts

"/usr/local/share/fonts/",

# common application, not really useful

"/usr/lib/openoffice/share/fonts/truetype/",

# user fonts

str(Path(os.environ.get('XDG_DATA_HOME',

Path.home() / ".local/share")) / "fonts"),

str(Path.home() / ".fonts"),

]

OSXFontDirectories = [

"/Library/Fonts/",

"/Network/Library/Fonts/",

"/System/Library/Fonts/",

# fonts installed via MacPorts

"/opt/local/share/fonts",

# user fonts

str(Path.home() / "Library/Fonts"),

]

def get_fontext_synonyms(fontext):

"""

Return a list of file extensions extensions that are synonyms for

the given file extension *fileext*.

"""

return {

'afm': ['afm'],

'otf': ['otf', 'ttc', 'ttf'],

'ttc': ['otf', 'ttc', 'ttf'],

'ttf': ['otf', 'ttc', 'ttf'],

}[fontext]

def list_fonts(directory, extensions):

"""

Return a list of all fonts matching any of the extensions, found

recursively under the directory.

"""

extensions = ["." + ext for ext in extensions]

return [os.path.join(dirpath, filename)

# os.walk ignores access errors, unlike Path.glob.

for dirpath, _, filenames in os.walk(directory)

for filename in filenames

if Path(filename).suffix.lower() in extensions]

def win32FontDirectory():

r"""

Return the user-specified font directory for Win32. This is

looked up from the registry key::

\\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Fonts

If the key is not found, ``%WINDIR%\Fonts`` will be returned.

"""

import winreg

try:

with winreg.OpenKey(winreg.HKEY_CURRENT_USER, MSFolders) as user:

return winreg.QueryValueEx(user, 'Fonts')[0]

except OSError:

return os.path.join(os.environ['WINDIR'], 'Fonts')

def _win32RegistryFonts(reg_domain, base_dir):

r"""

Searches for fonts in the Windows registry.

Parameters

----------

reg_domain : int

The top level registry domain (e.g. HKEY_LOCAL_MACHINE).

base_dir : str

The path to the folder where the font files are usually located (e.g.

C:\Windows\Fonts). If only the filename of the font is stored in the

registry, the absolute path is built relative to this base directory.

Returns

-------

`set`

`pathlib.Path` objects with the absolute path to the font files found.

"""

import winreg

items = set()

for reg_path in MSFontDirectories:

try:

with winreg.OpenKey(reg_domain, reg_path) as local:

for j in range(winreg.QueryInfoKey(local)[1]):

# value may contain the filename of the font or its

# absolute path.

key, value, tp = winreg.EnumValue(local, j)

if not isinstance(value, str):

continue

# Work around for https://bugs.python.org/issue25778, which

# is fixed in Py>=3.6.1.

value = value.split("\0", 1)[0]

try:

# If value contains already an absolute path, then it

# is not changed further.

path = Path(base_dir, value).resolve()

except RuntimeError:

# Don't fail with invalid entries.

continue

items.add(path)

except (OSError, MemoryError):

continue

return items

def win32InstalledFonts(directory=None, fontext='ttf'):

"""

Search for fonts in the specified font directory, or use the

system directories if none given. Additionally, it is searched for user

fonts installed. A list of TrueType font filenames are returned by default,

or AFM fonts if *fontext* == 'afm'.

"""

import winreg

if directory is None:

directory = win32FontDirectory()

fontext = ['.' + ext for ext in get_fontext_synonyms(fontext)]

items = set()

# System fonts

items.update(_win32RegistryFonts(winreg.HKEY_LOCAL_MACHINE, directory))

# User fonts

for userdir in MSUserFontDirectories:

items.update(_win32RegistryFonts(winreg.HKEY_CURRENT_USER, userdir))

# Keep only paths with matching file extension.

return [str(path) for path in items if path.suffix.lower() in fontext]

@cbook.deprecated("3.1")

def OSXInstalledFonts(directories=None, fontext='ttf'):

"""Get list of font files on OS X."""

if directories is None:

directories = OSXFontDirectories

return [path

for directory in directories

for path in list_fonts(directory, get_fontext_synonyms(fontext))]

@lru_cache()

def _call_fc_list():

"""Cache and list the font filenames known to `fc-list`.

"""

# Delay the warning by 5s.

timer = Timer(5, lambda: _log.warning(

'Matplotlib is building the font cache using fc-list. '

'This may take a moment.'))

timer.start()

try:

out = subprocess.check_output(['fc-list', '--format=%{file}\\n'])

except (OSError, subprocess.CalledProcessError):

return []

finally:

timer.cancel()

return [os.fsdecode(fname) for fname in out.split(b'\n')]

def get_fontconfig_fonts(fontext='ttf'):

"""List the font filenames known to `fc-list` having the given extension.

"""

fontext = ['.' + ext for ext in get_fontext_synonyms(fontext)]

return [fname for fname in _call_fc_list()

if Path(fname).suffix.lower() in fontext]

def findSystemFonts(fontpaths=None, fontext='ttf'):

"""

Search for fonts in the specified font paths. If no paths are

given, will use a standard set of system paths, as well as the

list of fonts tracked by fontconfig if fontconfig is installed and

available. A list of TrueType fonts are returned by default with

AFM fonts as an option.

"""

fontfiles = set()

fontexts = get_fontext_synonyms(fontext)

if fontpaths is None:

if sys.platform == 'win32':

fontpaths = MSUserFontDirectories + [win32FontDirectory()]

# now get all installed fonts directly...

fontfiles.update(win32InstalledFonts(fontext=fontext))

else:

fontpaths = X11FontDirectories

if sys.platform == 'darwin':

fontpaths = [*X11FontDirectories, *OSXFontDirectories]

fontfiles.update(get_fontconfig_fonts(fontext))

elif isinstance(fontpaths, str):

fontpaths = [fontpaths]

for path in fontpaths:

fontfiles.update(map(os.path.abspath, list_fonts(path, fontexts)))

return [fname for fname in fontfiles if os.path.exists(fname)]

class FontEntry(object):

"""

A class for storing Font properties. It is used when populating

the font lookup dictionary.

"""

def __init__(self,

fname ='',

name ='',

style ='normal',

variant='normal',

weight ='normal',

stretch='normal',

size ='medium',

self.fname = fname

self.name = name

self.style = style

self.variant = variant

self.weight = weight

self.stretch = stretch

try:

self.size = str(float(size))

except ValueError:

self.size = size

def __repr__(self):

return "<Font '%s' (%s) %s %s %s %s>" % (

self.name, os.path.basename(self.fname), self.style, self.variant,

self.weight, self.stretch)

def ttfFontProperty(font):

"""

Extract information from a TrueType font file.

Parameters

----------

font : `.FT2Font`

The TrueType font file from which information will be extracted.

Returns

-------

`FontEntry`

The extracted font properties.

"""

name = font.family_name

# Styles are: italic, oblique, and normal (default)

sfnt = font.get_sfnt()

# These tables are actually mac_roman-encoded, but mac_roman support may be

# missing in some alternative Python implementations and we are only going

# to look for ASCII substrings, where any ASCII-compatible encoding works

# - or big-endian UTF-16, since important Microsoft fonts use that.

sfnt2 = (sfnt.get((1, 0, 0, 2), b'').decode('latin-1').lower() or

sfnt.get((3, 1, 0x0409, 2), b'').decode('utf_16_be').lower())

sfnt4 = (sfnt.get((1, 0, 0, 4), b'').decode('latin-1').lower() or

sfnt.get((3, 1, 0x0409, 4), b'').decode('utf_16_be').lower())

if sfnt4.find('oblique') >= 0:

style = 'oblique'

elif sfnt4.find('italic') >= 0:

style = 'italic'

elif sfnt2.find('regular') >= 0:

style = 'normal'

elif font.style_flags & ft2font.ITALIC:

style = 'italic'

else:

style = 'normal'

# Variants are: small-caps and normal (default)

# !!!! Untested

if name.lower() in ['capitals', 'small-caps']:

variant = 'small-caps'

else:

variant = 'normal'

weight = next((w for w in weight_dict if sfnt4.find(w) >= 0), None)

if not weight:

if font.style_flags & ft2font.BOLD:

weight = 700

else:

weight = 400

# Stretch can be absolute and relative

# Absolute stretches are: ultra-condensed, extra-condensed, condensed,

# semi-condensed, normal, semi-expanded, expanded, extra-expanded,

# and ultra-expanded.

# Relative stretches are: wider, narrower

# Child value is: inherit

if (sfnt4.find('narrow') >= 0 or sfnt4.find('condensed') >= 0 or

sfnt4.find('cond') >= 0):

stretch = 'condensed'

elif sfnt4.find('demi cond') >= 0:

stretch = 'semi-condensed'

elif sfnt4.find('wide') >= 0 or sfnt4.find('expanded') >= 0:

stretch = 'expanded'

else:

stretch = 'normal'

# Sizes can be absolute and relative.

# Absolute sizes are: xx-small, x-small, small, medium, large, x-large,

# and xx-large.

# Relative sizes are: larger, smaller

# Length value is an absolute font size, e.g., 12pt

# Percentage values are in 'em's. Most robust specification.

if not font.scalable:

raise NotImplementedError("Non-scalable fonts are not supported")

size = 'scalable'

return FontEntry(font.fname, name, style, variant, weight, stretch, size)

def afmFontProperty(fontpath, font):

"""

Extract information from an AFM font file.

Parameters

----------

font : `.AFM`

The AFM font file from which information will be extracted.

Returns

-------

`FontEntry`

The extracted font properties.

"""

name = font.get_familyname()

fontname = font.get_fontname().lower()

# Styles are: italic, oblique, and normal (default)

if font.get_angle() != 0 or 'italic' in name.lower():

style = 'italic'

elif 'oblique' in name.lower():

style = 'oblique'

else:

style = 'normal'

# Variants are: small-caps and normal (default)

# !!!! Untested

if name.lower() in ['capitals', 'small-caps']:

variant = 'small-caps'

else:

variant = 'normal'

weight = font.get_weight().lower()

if weight not in weight_dict:

weight = 'normal'

# Stretch can be absolute and relative

# Absolute stretches are: ultra-condensed, extra-condensed, condensed,

# semi-condensed, normal, semi-expanded, expanded, extra-expanded,

# and ultra-expanded.

# Relative stretches are: wider, narrower

# Child value is: inherit

if 'demi cond' in fontname:

stretch = 'semi-condensed'

elif 'narrow' in fontname or 'cond' in fontname:

stretch = 'condensed'

elif 'wide' in fontname or 'expanded' in fontname:

stretch = 'expanded'

else:

stretch = 'normal'

# Sizes can be absolute and relative.

# Absolute sizes are: xx-small, x-small, small, medium, large, x-large,

# and xx-large.

# Relative sizes are: larger, smaller

# Length value is an absolute font size, e.g., 12pt

# Percentage values are in 'em's. Most robust specification.

# All AFM fonts are apparently scalable.

size = 'scalable'

return FontEntry(fontpath, name, style, variant, weight, stretch, size)

def createFontList(fontfiles, fontext='ttf'):

"""

A function to create a font lookup list. The default is to create

a list of TrueType fonts. An AFM font list can optionally be

created.

"""

fontlist = []

# Add fonts from list of known font files.

seen = set()

for fpath in fontfiles:

_log.debug('createFontDict: %s', fpath)

fname = os.path.split(fpath)[1]

if fname in seen:

continue

if fontext == 'afm':

try:

with open(fpath, 'rb') as fh:

font = afm.AFM(fh)

except EnvironmentError:

_log.info("Could not open font file %s", fpath)

continue

except RuntimeError:

_log.info("Could not parse font file %s", fpath)

continue

try:

prop = afmFontProperty(fpath, font)

except KeyError as exc:

_log.info("Could not extract properties for %s: %s",

fpath, exc)

continue

else:

try:

font = ft2font.FT2Font(fpath)

except (OSError, RuntimeError) as exc:

_log.info("Could not open font file %s: %s", fpath, exc)

continue

except UnicodeError:

_log.info("Cannot handle unicode filenames")

continue

try:

prop = ttfFontProperty(font)

except (KeyError, RuntimeError, ValueError,

NotImplementedError) as exc:

_log.info("Could not extract properties for %s: %s",

fpath, exc)

continue

fontlist.append(prop)

seen.add(fname)

return fontlist

class FontProperties(object):

"""

A class for storing and manipulating font properties.

The font properties are those described in the `W3C Cascading

Style Sheet, Level 1

<http://www.w3.org/TR/1998/REC-CSS2-19980512/>`_ font

specification. The six properties are:

- family: A list of font names in decreasing order of priority.

The items may include a generic font family name, either

'serif', 'sans-serif', 'cursive', 'fantasy', or 'monospace'.

In that case, the actual font to be used will be looked up

from the associated rcParam.

- style: Either 'normal', 'italic' or 'oblique'.

- variant: Either 'normal' or 'small-caps'.

- stretch: A numeric value in the range 0-1000 or one of

'ultra-condensed', 'extra-condensed', 'condensed',

'semi-condensed', 'normal', 'semi-expanded', 'expanded',

'extra-expanded' or 'ultra-expanded'

- weight: A numeric value in the range 0-1000 or one of

'ultralight', 'light', 'normal', 'regular', 'book', 'medium',

'roman', 'semibold', 'demibold', 'demi', 'bold', 'heavy',

'extra bold', 'black'

- size: Either an relative value of 'xx-small', 'x-small',

'small', 'medium', 'large', 'x-large', 'xx-large' or an

absolute font size, e.g., 12

The default font property for TrueType fonts (as specified in the

default rcParams) is::

sans-serif, normal, normal, normal, normal, scalable.

Alternatively, a font may be specified using an absolute path to a

.ttf file, by using the *fname* kwarg.

The preferred usage of font sizes is to use the relative values,

e.g., 'large', instead of absolute font sizes, e.g., 12. This

approach allows all text sizes to be made larger or smaller based

on the font manager's default font size.

This class will also accept a fontconfig_ pattern_, if it is the only

argument provided. This support does not require fontconfig to be

installed. We are merely borrowing its pattern syntax for use here.

.. _fontconfig: https://www.freedesktop.org/wiki/Software/fontconfig/

.. _pattern:

https://www.freedesktop.org/software/fontconfig/fontconfig-user.html

Note that Matplotlib's internal font manager and fontconfig use a

different algorithm to lookup fonts, so the results of the same pattern

may be different in Matplotlib than in other applications that use

fontconfig.

"""

def __init__(self,

family = None,

style = None,

variant= None,

weight = None,

stretch= None,

size = None,

fname = None, # if set, it's a hardcoded filename to use

self._family = _normalize_font_family(rcParams['font.family'])

self._slant = rcParams['font.style']

self._variant = rcParams['font.variant']

self._weight = rcParams['font.weight']

self._stretch = rcParams['font.stretch']

self._size = rcParams['font.size']

self._file = None

if isinstance(family, str):

# Treat family as a fontconfig pattern if it is the only

# parameter provided.

if (style is None and

variant is None and

weight is None and

stretch is None and

size is None and

fname is None):

self.set_fontconfig_pattern(family)

return

self.set_family(family)

self.set_style(style)

self.set_variant(variant)

self.set_weight(weight)

self.set_stretch(stretch)

self.set_file(fname)

self.set_size(size)

def _parse_fontconfig_pattern(self, pattern):

return parse_fontconfig_pattern(pattern)

def __hash__(self):

l = (tuple(self.get_family()),

self.get_slant(),

self.get_variant(),

self.get_weight(),

self.get_stretch(),

self.get_size_in_points(),

self.get_file())

return hash(l)

def __eq__(self, other):

return hash(self) == hash(other)

def __str__(self):

return self.get_fontconfig_pattern()

def get_family(self):

"""

Return a list of font names that comprise the font family.

"""

return self._family

def get_name(self):

"""

Return the name of the font that best matches the font properties.

"""

return get_font(findfont(self)).family_name

def get_style(self):

"""

Return the font style. Values are: 'normal', 'italic' or 'oblique'.

"""

return self._slant

get_slant = get_style

def get_variant(self):

"""

Return the font variant. Values are: 'normal' or 'small-caps'.

"""

return self._variant

def get_weight(self):

"""

Set the font weight. Options are: A numeric value in the

range 0-1000 or one of 'light', 'normal', 'regular', 'book',

'medium', 'roman', 'semibold', 'demibold', 'demi', 'bold',

'heavy', 'extra bold', 'black'

"""

return self._weight

def get_stretch(self):

"""

Return the font stretch or width. Options are: 'ultra-condensed',

'extra-condensed', 'condensed', 'semi-condensed', 'normal',

'semi-expanded', 'expanded', 'extra-expanded', 'ultra-expanded'.

"""

return self._stretch

def get_size(self):

"""

Return the font size.

"""

return self._size

def get_size_in_points(self):

return self._size

def get_file(self):

"""

Return the filename of the associated font.

"""

return self._file

def get_fontconfig_pattern(self):

"""

Get a fontconfig_ pattern_ suitable for looking up the font as

specified with fontconfig's ``fc-match`` utility.

This support does not require fontconfig to be installed or

support for it to be enabled. We are merely borrowing its

pattern syntax for use here.

"""

return generate_fontconfig_pattern(self)

def set_family(self, family):

"""

Change the font family. May be either an alias (generic name

is CSS parlance), such as: 'serif', 'sans-serif', 'cursive',

'fantasy', or 'monospace', a real font name or a list of real

font names. Real font names are not supported when

`text.usetex` is `True`.

"""

if family is None:

family = rcParams['font.family']

self._family = _normalize_font_family(family)

set_name = set_family

def set_style(self, style):

"""

Set the font style. Values are: 'normal', 'italic' or 'oblique'.

"""

if style is None:

style = rcParams['font.style']

cbook._check_in_list(['normal', 'italic', 'oblique'], style=style)

self._slant = style

set_slant = set_style

def set_variant(self, variant):

"""

Set the font variant. Values are: 'normal' or 'small-caps'.

"""

if variant is None:

variant = rcParams['font.variant']

cbook._check_in_list(['normal', 'small-caps'], variant=variant)

self._variant = variant

def set_weight(self, weight):

"""

Set the font weight. May be either a numeric value in the

range 0-1000 or one of 'ultralight', 'light', 'normal',

'regular', 'book', 'medium', 'roman', 'semibold', 'demibold',

'demi', 'bold', 'heavy', 'extra bold', 'black'

"""

if weight is None:

weight = rcParams['font.weight']

try:

weight = int(weight)

if weight < 0 or weight > 1000:

raise ValueError()

except ValueError:

if weight not in weight_dict:

raise ValueError("weight is invalid")

self._weight = weight

def set_stretch(self, stretch):

"""

Set the font stretch or width. Options are: 'ultra-condensed',

'extra-condensed', 'condensed', 'semi-condensed', 'normal',

'semi-expanded', 'expanded', 'extra-expanded' or

'ultra-expanded', or a numeric value in the range 0-1000.

"""

if stretch is None:

stretch = rcParams['font.stretch']

try:

stretch = int(stretch)

if stretch < 0 or stretch > 1000:

raise ValueError()

except ValueError:

if stretch not in stretch_dict:

raise ValueError("stretch is invalid")

self._stretch = stretch

def set_size(self, size):

"""

Set the font size. Either an relative value of 'xx-small',

'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'

or an absolute font size, e.g., 12.

"""

if size is None:

size = rcParams['font.size']

try:

size = float(size)

except ValueError:

try:

scale = font_scalings[size]

except KeyError:

raise ValueError(

"Size is invalid. Valid font size are "

+ ", ".join(map(str, font_scalings)))

else:

size = scale * FontManager.get_default_size()

if size < 1.0:

_log.info('Fontsize %1.2f < 1.0 pt not allowed by FreeType. '

'Setting fontsize = 1 pt', size)

size = 1.0

self._size = size

def set_file(self, file):

"""

Set the filename of the fontfile to use. In this case, all

other properties will be ignored.

"""

self._file = file

def set_fontconfig_pattern(self, pattern):

"""

Set the properties by parsing a fontconfig_ *pattern*.

This support does not require fontconfig to be installed or

support for it to be enabled. We are merely borrowing its

pattern syntax for use here.

"""

for key, val in self._parse_fontconfig_pattern(pattern).items():

if type(val) == list:

getattr(self, "set_" + key)(val[0])

else:

getattr(self, "set_" + key)(val)

def copy(self):

"""Return a copy of self."""

new = type(self)()

vars(new).update(vars(self))

return new

class JSONEncoder(json.JSONEncoder):

def default(self, o):

if isinstance(o, FontManager):

return dict(o.__dict__, __class__='FontManager')

elif isinstance(o, FontEntry):

d = dict(o.__dict__, __class__='FontEntry')

try:

# Cache paths of fonts shipped with mpl relative to the mpl

# data path, which helps in the presence of venvs.

d["fname"] = str(

Path(d["fname"]).relative_to(mpl.get_data_path()))

except ValueError:

pass

return d

else:

return super().default(o)

def _json_decode(o):

cls = o.pop('__class__', None)

if cls is None:

return o

elif cls == 'FontManager':

r = FontManager.__new__(FontManager)

r.__dict__.update(o)

return r

elif cls == 'FontEntry':

r = FontEntry.__new__(FontEntry)

r.__dict__.update(o)

if not os.path.isabs(r.fname):

r.fname = os.path.join(mpl.get_data_path(), r.fname)

return r

else:

raise ValueError("don't know how to deserialize __class__=%s" % cls)

def json_dump(data, filename):

"""

Dumps a data structure as JSON in the named file.

Handles FontManager and its fields. File paths that are children of the

Matplotlib data path (typically, fonts shipped with Matplotlib) are stored

relative to that data path (to remain valid across virtualenvs).

"""

with open(filename, 'w') as fh:

try:

json.dump(data, fh, cls=JSONEncoder, indent=2)

except OSError as e:

_log.warning('Could not save font_manager cache {}'.format(e))

def json_load(filename):

"""

Loads a data structure as JSON from the named file.

Handles FontManager and its fields. Relative file paths are interpreted

as being relative to the Matplotlib data path, and transformed into

absolute paths.

"""

with open(filename, 'r') as fh:

return json.load(fh, object_hook=_json_decode)

def _normalize_font_family(family):

if isinstance(family, str):

family = [family]

return family

@cbook.deprecated("3.0")

class TempCache(object):

"""

A class to store temporary caches that are (a) not saved to disk

and (b) invalidated whenever certain font-related

rcParams---namely the family lookup lists---are changed or the

font cache is reloaded. This avoids the expensive linear search

through all fonts every time a font is looked up.

"""

# A list of rcparam names that, when changed, invalidated this

# cache.

invalidating_rcparams = (

'font.serif', 'font.sans-serif', 'font.cursive', 'font.fantasy',

'font.monospace')

def __init__(self):

self._lookup_cache = {}

self._last_rcParams = self.make_rcparams_key()

def make_rcparams_key(self):

return [id(fontManager)] + [

rcParams[param] for param in self.invalidating_rcparams]

def get(self, prop):

key = self.make_rcparams_key()

if key != self._last_rcParams:

self._lookup_cache = {}

self._last_rcParams = key

return self._lookup_cache.get(prop)

def set(self, prop, value):

key = self.make_rcparams_key()

if key != self._last_rcParams:

self._lookup_cache = {}

self._last_rcParams = key

self._lookup_cache[prop] = value

class FontManager(object):

"""

On import, the :class:`FontManager` singleton instance creates a

list of TrueType fonts based on the font properties: name, style,

variant, weight, stretch, and size. The :meth:`findfont` method

does a nearest neighbor search to find the font that most closely

matches the specification. If no good enough match is found, a

default font is returned.

"""

# Increment this version number whenever the font cache data

# format or behavior has changed and requires a existing font

# cache files to be rebuilt.

__version__ = 310

def __init__(self, size=None, weight='normal'):

self._version = self.__version__

self.__default_weight = weight

self.default_size = size

paths = [os.path.join(rcParams['datapath'], 'fonts', 'ttf'),

os.path.join(rcParams['datapath'], 'fonts', 'afm'),

os.path.join(rcParams['datapath'], 'fonts', 'pdfcorefonts')]

# Create list of font paths

for pathname in ['TTFPATH', 'AFMPATH']:

if pathname in os.environ:

ttfpath = os.environ[pathname]

if ttfpath.find(';') >= 0: # win32 style

View remainder of file in raw view

matplotlib/lib/matplotlib/font_manager.py at v3.1.x · matplotlib/matplotlib · GitHub

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