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Pillow/PIL/ImageFont.py

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#
# The Python Imaging Library.
# $Id$
#
# PIL raster font management
#
# History:
# 1996-08-07 fl created (experimental)
# 1997-08-25 fl minor adjustments to handle fonts from pilfont 0.3
# 1999-02-06 fl rewrote most font management stuff in C
# 1999-03-17 fl take pth files into account in load_path (from Richard Jones)
# 2001-02-17 fl added freetype support
# 2001-05-09 fl added TransposedFont wrapper class
# 2002-03-04 fl make sure we have a "L" or "1" font
# 2002-12-04 fl skip non-directory entries in the system path
# 2003-04-29 fl add embedded default font
# 2003-09-27 fl added support for truetype charmap encodings
#
# Todo:
# Adapt to PILFONT2 format (16-bit fonts, compressed, single file)
#
# Copyright (c) 1997-2003 by Secret Labs AB
# Copyright (c) 1996-2003 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
from . import Image
from ._util import isDirectory, isPath
import os
import sys
class _imagingft_not_installed(object):
# module placeholder
def __getattr__(self, id):
raise ImportError("The _imagingft C module is not installed")
try:
from . import _imagingft as core
except ImportError:
core = _imagingft_not_installed()
# FIXME: add support for pilfont2 format (see FontFile.py)
# --------------------------------------------------------------------
# Font metrics format:
# "PILfont" LF
# fontdescriptor LF
# (optional) key=value... LF
# "DATA" LF
# binary data: 256*10*2 bytes (dx, dy, dstbox, srcbox)
#
# To place a character, cut out srcbox and paste at dstbox,
# relative to the character position. Then move the character
# position according to dx, dy.
# --------------------------------------------------------------------
class ImageFont(object):
"PIL font wrapper"
def _load_pilfont(self, filename):
with open(filename, "rb") as fp:
for ext in (".png", ".gif", ".pbm"):
try:
fullname = os.path.splitext(filename)[0] + ext
image = Image.open(fullname)
except:
pass
else:
if image and image.mode in ("1", "L"):
break
else:
raise IOError("cannot find glyph data file")
self.file = fullname
return self._load_pilfont_data(fp, image)
def _load_pilfont_data(self, file, image):
# read PILfont header
if file.readline() != b"PILfont\n":
raise SyntaxError("Not a PILfont file")
file.readline().split(b";")
self.info = [] # FIXME: should be a dictionary
while True:
s = file.readline()
if not s or s == b"DATA\n":
break
self.info.append(s)
# read PILfont metrics
data = file.read(256*20)
# check image
if image.mode not in ("1", "L"):
raise TypeError("invalid font image mode")
image.load()
self.font = Image.core.font(image.im, data)
# delegate critical operations to internal type
self.getsize = self.font.getsize
self.getmask = self.font.getmask
##
# Wrapper for FreeType fonts. Application code should use the
# <b>truetype</b> factory function to create font objects.
class FreeTypeFont(object):
"FreeType font wrapper (requires _imagingft service)"
def __init__(self, font=None, size=10, index=0, encoding=""):
# FIXME: use service provider instead
self.path = font
self.size = size
self.index = index
self.encoding = encoding
if isPath(font):
self.font = core.getfont(font, size, index, encoding)
else:
self.font_bytes = font.read()
self.font = core.getfont(
"", size, index, encoding, self.font_bytes)
def getname(self):
return self.font.family, self.font.style
def getmetrics(self):
return self.font.ascent, self.font.descent
def getsize(self, text):
size, offset = self.font.getsize(text)
return (size[0] + offset[0], size[1] + offset[1])
def getoffset(self, text):
return self.font.getsize(text)[1]
def getmask(self, text, mode=""):
return self.getmask2(text, mode)[0]
def getmask2(self, text, mode="", fill=Image.core.fill):
size, offset = self.font.getsize(text)
im = fill("L", size, 0)
self.font.render(text, im.id, mode == "1")
return im, offset
def font_variant(self, font=None, size=None, index=None, encoding=None):
"""
Create a copy of this FreeTypeFont object,
using any specified arguments to override the settings.
Parameters are identical to the parameters used to initialize this
object.
:return: A FreeTypeFont object.
"""
return FreeTypeFont(font=self.path if font is None else font,
size=self.size if size is None else size,
index=self.index if index is None else index,
encoding=self.encoding if encoding is None else
encoding)
class TransposedFont(object):
"Wrapper for writing rotated or mirrored text"
def __init__(self, font, orientation=None):
"""
Wrapper that creates a transposed font from any existing font
object.
:param font: A font object.
:param orientation: An optional orientation. If given, this should
be one of Image.FLIP_LEFT_RIGHT, Image.FLIP_TOP_BOTTOM,
Image.ROTATE_90, Image.ROTATE_180, or Image.ROTATE_270.
"""
self.font = font
self.orientation = orientation # any 'transpose' argument, or None
def getsize(self, text):
w, h = self.font.getsize(text)
if self.orientation in (Image.ROTATE_90, Image.ROTATE_270):
return h, w
return w, h
def getmask(self, text, mode=""):
im = self.font.getmask(text, mode)
if self.orientation is not None:
return im.transpose(self.orientation)
return im
def load(filename):
"""
Load a font file. This function loads a font object from the given
bitmap font file, and returns the corresponding font object.
:param filename: Name of font file.
:return: A font object.
:exception IOError: If the file could not be read.
"""
f = ImageFont()
f._load_pilfont(filename)
return f
def truetype(font=None, size=10, index=0, encoding=""):
"""
Load a TrueType or OpenType font file, and create a font object.
This function loads a font object from the given file, and creates
a font object for a font of the given size.
This function requires the _imagingft service.
:param font: A truetype font file. Under Windows, if the file
is not found in this filename, the loader also looks in
Windows :file:`fonts/` directory.
:param size: The requested size, in points.
:param index: Which font face to load (default is first available face).
:param encoding: Which font encoding to use (default is Unicode). Common
encodings are "unic" (Unicode), "symb" (Microsoft
Symbol), "ADOB" (Adobe Standard), "ADBE" (Adobe Expert),
and "armn" (Apple Roman). See the FreeType documentation
for more information.
:return: A font object.
:exception IOError: If the file could not be read.
"""
try:
return FreeTypeFont(font, size, index, encoding)
except IOError:
ttf_filename = os.path.basename(font)
dirs = []
if sys.platform == "win32":
# check the windows font repository
# NOTE: must use uppercase WINDIR, to work around bugs in
# 1.5.2's os.environ.get()
windir = os.environ.get("WINDIR")
if windir:
dirs.append(os.path.join(windir, "fonts"))
elif sys.platform in ('linux', 'linux2'):
lindirs = os.environ.get("XDG_DATA_DIRS", "")
if not lindirs:
# According to the freedesktop spec, XDG_DATA_DIRS should
# default to /usr/share
lindirs = '/usr/share'
dirs += [os.path.join(lindir, "fonts")
for lindir in lindirs.split(":")]
elif sys.platform == 'darwin':
dirs += ['/Library/Fonts', '/System/Library/Fonts',
os.path.expanduser('~/Library/Fonts')]
ext = os.path.splitext(ttf_filename)[1]
first_font_with_a_different_extension = None
for directory in dirs:
for walkroot, walkdir, walkfilenames in os.walk(directory):
for walkfilename in walkfilenames:
if ext and walkfilename == ttf_filename:
fontpath = os.path.join(walkroot, walkfilename)
return FreeTypeFont(fontpath, size, index, encoding)
elif not ext and os.path.splitext(walkfilename)[0] == ttf_filename:
fontpath = os.path.join(walkroot, walkfilename)
if os.path.splitext(fontpath)[1] == '.ttf':
return FreeTypeFont(fontpath, size, index, encoding)
if not ext and first_font_with_a_different_extension is None:
first_font_with_a_different_extension = fontpath
if first_font_with_a_different_extension:
return FreeTypeFont(first_font_with_a_different_extension, size,
index, encoding)
raise
def load_path(filename):
"""
Load font file. Same as :py:func:`~PIL.ImageFont.load`, but searches for a
bitmap font along the Python path.
:param filename: Name of font file.
:return: A font object.
:exception IOError: If the file could not be read.
"""
for directory in sys.path:
if isDirectory(directory):
if not isinstance(filename, str):
if bytes is str:
filename = filename.encode("utf-8")
else:
filename = filename.decode("utf-8")
try:
return load(os.path.join(directory, filename))
except IOError:
pass
raise IOError("cannot find font file")
def load_default():
"""Load a "better than nothing" default font.
.. versionadded:: 1.1.4
:return: A font object.
"""
from io import BytesIO
import base64
f = ImageFont()
f._load_pilfont_data(
# courB08
BytesIO(base64.b64decode(b'''
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'''))))
return f
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