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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>matplotlib.type1font — Matplotlib 3.4.1 documentation</title>

title="Search within Matplotlib 3.4.1 documentation"

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<li class="nav-item nav-item-this"><a href="">matplotlib.type1font</a></li>

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<h1>Source code for matplotlib.type1font</h1><div class="highlight"><pre>

"""

A class representing a Type 1 font.

This version reads pfa and pfb files and splits them for embedding in

pdf files. It also supports SlantFont and ExtendFont transformations,

similarly to pdfTeX and friends. There is no support yet for subsetting.

Usage::

>>> font = Type1Font(filename)

>>> clear_part, encrypted_part, finale = font.parts

>>> slanted_font = font.transform({'slant': 0.167})

>>> extended_font = font.transform({'extend': 1.2})

Sources:

* Adobe Technical Note #5040, Supporting Downloadable PostScript

Language Fonts.

* Adobe Type 1 Font Format, Adobe Systems Incorporated, third printing,

v1.1, 1993. ISBN 0-201-57044-0.

"""

import binascii

import enum

import itertools

import re

import struct

import numpy as np

from matplotlib.cbook import _format_approx

# token types

_TokenType = enum.Enum('_TokenType',

'whitespace name string delimiter number')

<div class="viewcode-block" id="Type1Font"><a class="viewcode-back" href="../../api/type1font.html#matplotlib.type1font.Type1Font">[docs]</a>class Type1Font:

"""

A class representing a Type-1 font, for use by backends.

Attributes

----------

parts : tuple

A 3-tuple of the cleartext part, the encrypted part, and the finale of

zeros.

prop : dict[str, Any]

A dictionary of font properties.

"""

__slots__ = ('parts', 'prop')

def __init__(self, input):

"""

Initialize a Type-1 font.

Parameters

----------

input : str or 3-tuple

Either a pfb file name, or a 3-tuple of already-decoded Type-1

font `~.Type1Font.parts`.

"""

if isinstance(input, tuple) and len(input) == 3:

self.parts = input

else:

with open(input, 'rb') as file:

data = self._read(file)

self.parts = self._split(data)

self._parse()

def _read(self, file):

"""Read the font from a file, decoding into usable parts."""

rawdata = file.read()

if not rawdata.startswith(b'\x80'):

return rawdata

data = b''

while rawdata:

raise RuntimeError('Broken pfb file (expected byte 128, '

'got %d)' % rawdata[0])

type = rawdata[1]

if type in (1, 2):

length, = struct.unpack('<i', rawdata[2:6])

segment = rawdata[6:6 + length]

rawdata = rawdata[6 + length:]

if type == 1: # ASCII text: include verbatim

data += segment

elif type == 2: # binary data: encode in hexadecimal

data += binascii.hexlify(segment)

elif type == 3: # end of file

break

else:

raise RuntimeError('Unknown segment type %d in pfb file' %

type)

return data

def _split(self, data):

"""

Split the Type 1 font into its three main parts.

The three parts are: (1) the cleartext part, which ends in a

eexec operator; (2) the encrypted part; (3) the fixed part,

which contains 512 ASCII zeros possibly divided on various

lines, a cleartomark operator, and possibly something else.

"""

# Cleartext part: just find the eexec and skip whitespace

idx = data.index(b'eexec')

idx += len(b'eexec')

while data[idx] in b' \t\r\n':

idx += 1

len1 = idx

# Encrypted part: find the cleartomark operator and count

# zeros backward

idx = data.rindex(b'cleartomark') - 1

zeros = 512

while zeros and data[idx] in b'0' or data[idx] in b'\r\n':

if data[idx] in b'0':

zeros -= 1

idx -= 1

if zeros:

raise RuntimeError('Insufficiently many zeros in Type 1 font')

# Convert encrypted part to binary (if we read a pfb file, we may end

# up converting binary to hexadecimal to binary again; but if we read

# a pfa file, this part is already in hex, and I am not quite sure if

# even the pfb format guarantees that it will be in binary).

binary = binascii.unhexlify(data[len1:idx+1])

return data[:len1], binary, data[idx+1:]

_whitespace_re = re.compile(br'[\0\t\r\014\n ]+')

_token_re = re.compile(br'/{0,2}[^]\0\t\r\v\n ()<>{}/%[]+')

_comment_re = re.compile(br'%[^\r\n\v]*')

_instring_re = re.compile(br'[()\\]')

@classmethod

def _tokens(cls, text):

"""

A PostScript tokenizer. Yield (token, value) pairs such as

(_TokenType.whitespace, ' ') or (_TokenType.name, '/Foobar').

"""

pos = 0

while pos < len(text):

match = (cls._comment_re.match(text[pos:]) or

cls._whitespace_re.match(text[pos:]))

if match:

yield (_TokenType.whitespace, match.group())

pos += match.end()

elif text[pos] == b'(':

start = pos

pos += 1

depth = 1

while depth:

match = cls._instring_re.search(text[pos:])

if match is None:

return

pos += match.end()

if match.group() == b'(':

depth += 1

elif match.group() == b')':

depth -= 1

else: # a backslash - skip the next character

pos += 1

yield (_TokenType.string, text[start:pos])

elif text[pos:pos + 2] in (b'<<', b'>>'):

yield (_TokenType.delimiter, text[pos:pos + 2])

pos += 2

start = pos

pos += text[pos:].index(b'>')

else:

match = cls._token_re.match(text[pos:])

if match:

try:

float(match.group())

yield (_TokenType.number, match.group())

except ValueError:

yield (_TokenType.name, match.group())

pos += match.end()

else:

pos += 1

def _parse(self):

"""

Find the values of various font properties. This limited kind

of parsing is described in Chapter 10 "Adobe Type Manager

Compatibility" of the Type-1 spec.

"""

# Start with reasonable defaults

prop = {'weight': 'Regular', 'ItalicAngle': 0.0, 'isFixedPitch': False,

'UnderlinePosition': -100, 'UnderlineThickness': 50}

filtered = ((token, value)

for token, value in self._tokens(self.parts[0])

if token is not _TokenType.whitespace)

# The spec calls this an ASCII format; in Python 2.x we could

# just treat the strings and names as opaque bytes but let's

# turn them into proper Unicode, and be lenient in case of high bytes.

def convert(x): return x.decode('ascii', 'replace')

for token, value in filtered:

if token is _TokenType.name and value.startswith(b'/'):

key = convert(value[1:])

token, value = next(filtered)

if token is _TokenType.name:

if value in (b'true', b'false'):

value = value == b'true'

else:

elif token is _TokenType.string:

value = convert(value.lstrip(b'(').rstrip(b')'))

elif token is _TokenType.number:

if b'.' in value:

value = float(value)

else:

value = int(value)

else: # more complicated value such as an array

value = None

if key != 'FontInfo' and value is not None:

prop[key] = value

# Fill in the various *Name properties

if 'FontName' not in prop:

prop['FontName'] = (prop.get('FullName') or

prop.get('FamilyName') or

'Unknown')

if 'FullName' not in prop:

prop['FullName'] = prop['FontName']

if 'FamilyName' not in prop:

'(ultra)?light|extra|condensed))+$')

prop['FamilyName'] = re.sub(extras, '', prop['FullName'])

self.prop = prop

@classmethod

def _transformer(cls, tokens, slant, extend):

def fontname(name):

result = name

if slant:

result += b'_Slant_%d' % int(1000 * slant)

if extend != 1.0:

result += b'_Extend_%d' % int(1000 * extend)

return result

def italicangle(angle):

return b'%a' % round(

float(angle) - np.arctan(slant) / np.pi * 180,

5

)

def fontmatrix(array):

array = array.lstrip(b'[').rstrip(b']').split()

array = [float(x) for x in array]

oldmatrix = np.eye(3, 3)

oldmatrix[0:3, 0] = array[::2]

oldmatrix[0:3, 1] = array[1::2]

modifier = np.array([[extend, 0, 0],

[slant, 1, 0],

[0, 0, 1]])

newmatrix = np.dot(modifier, oldmatrix)

array[::2] = newmatrix[0:3, 0]

array[1::2] = newmatrix[0:3, 1]

return (

'[%s]' % ' '.join(_format_approx(x, 6) for x in array)

).encode('ascii')

def replace(fun):

def replacer(tokens):

yield value

while token is _TokenType.whitespace:

yield value

if value != b'[': # name/number/etc.

yield fun(value)

else: # array, e.g., [1 2 3]

result = b''

while value != b']':

result += value

yield fun(result)

return replacer

def suppress(tokens):

for _ in itertools.takewhile(lambda x: x[1] != b'def', tokens):

pass

yield b''

table = {b'/FontName': replace(fontname),

b'/ItalicAngle': replace(italicangle),

b'/FontMatrix': replace(fontmatrix),

b'/UniqueID': suppress}

for token, value in tokens:

if token is _TokenType.name and value in table:

yield from table[value](

itertools.chain([(token, value)], tokens))

else:

yield value

<div class="viewcode-block" id="Type1Font.transform"><a class="viewcode-back" href="../../api/type1font.html#matplotlib.type1font.Type1Font.transform">[docs]</a> def transform(self, effects):

"""

Return a new font that is slanted and/or extended.

Parameters

----------

effects : dict

A dict with optional entries:

- 'slant' : float, default: 0

Tangent of the angle that the font is to be slanted to the

right. Negative values slant to the left.

- 'extend' : float, default: 1

Scaling factor for the font width. Values less than 1 condense

the glyphs.

Returns

-------

`Type1Font`

"""

tokenizer = self._tokens(self.parts[0])

transformed = self._transformer(tokenizer,

slant=effects.get('slant', 0.0),

extend=effects.get('extend', 1.0))

return Type1Font((b"".join(transformed), self.parts[1], self.parts[2]))</div></div>

</pre></div>

</div>

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Last updated on Mar 31, 2021.

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