Pillow/PIL/ImageFont.py

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2010-07-31 06:52:47 +04:00
#
# 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 __future__ import print_function
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from PIL import Image
import os, sys
try:
import warnings
except ImportError:
warnings = None
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class _imagingft_not_installed:
# module placeholder
def __getattr__(self, id):
raise ImportError("The _imagingft C module is not installed")
try:
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import _imagingft as core
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except ImportError:
core = _imagingft_not_installed()
if bytes is str:
def isStringType(t):
return isinstance(t, basestring)
else:
def isStringType(t):
return isinstance(t, str)
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# 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.
# --------------------------------------------------------------------
##
# The <b>ImageFont</b> module defines a class with the same name.
# Instances of this class store bitmap fonts, and are used with the
# <b>text</b> method of the <b>ImageDraw</b> class.
# <p>
# PIL uses it's own font file format to store bitmap fonts. You can
# use the <b>pilfont</b> utility to convert BDF and PCF font
# descriptors (X window font formats) to this format.
# <p>
# Starting with version 1.1.4, PIL can be configured to support
# TrueType and OpenType fonts. For earlier version, TrueType
# support is only available as part of the imToolkit package
#
# @see ImageDraw#ImageDraw.text
# @see pilfont
class ImageFont:
"PIL font wrapper"
def _load_pilfont(self, filename):
file = open(filename, "rb")
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(file, image)
def _load_pilfont_data(self, file, image):
# read PILfont header
if file.readline() != b"PILfont\n":
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raise SyntaxError("Not a PILfont file")
d = file.readline().split(b";")
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self.info = [] # FIXME: should be a dictionary
while True:
s = file.readline()
if not s or s == b"DATA\n":
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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:
"FreeType font wrapper (requires _imagingft service)"
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def __init__(self, font=None, size=10, index=0, encoding="", file=None):
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# FIXME: use service provider instead
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if file:
if warnings:
warnings.warn('file parameter deprecated, please use font parameter instead.', DeprecationWarning)
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font = file
if isStringType(font):
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self.font = core.getfont(font, size, index, encoding)
else:
self.font_bytes = font.read()
self.font = core.getfont("", size, index, encoding, self.font_bytes)
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def getname(self):
return self.font.family, self.font.style
def getmetrics(self):
return self.font.ascent, self.font.descent
def getsize(self, text):
return self.font.getsize(text)[0]
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
##
# 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.
class TransposedFont:
"Wrapper for writing rotated or mirrored text"
def __init__(self, font, orientation=None):
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
##
# Load 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.
def load(filename):
"Load a font file."
f = ImageFont()
f._load_pilfont(filename)
return f
##
# 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.
# <p>
# This function requires the _imagingft service.
#
# @param filename A truetype font file. Under Windows, if the file
# is not found in this filename, the loader also looks in Windows
# <b>fonts</b> 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.
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def truetype(font=None, size=10, index=0, encoding="", filename=None):
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"Load a truetype font file."
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if filename:
if warnings:
warnings.warn('filename parameter deprecated, please use font parameter instead.', DeprecationWarning)
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font = filename
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try:
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return FreeTypeFont(font, size, index, encoding)
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except IOError:
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:
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filename = os.path.join(windir, "fonts", font)
return FreeTypeFont(font, size, index, encoding)
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raise
##
# Load font file. Same as 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.
# @see #load
def load_path(filename):
"Load a font file, searching along the Python path."
for dir in sys.path:
if Image.isDirectory(dir):
try:
return load(os.path.join(dir, filename))
except IOError:
pass
raise IOError("cannot find font file")
##
# Load a (probably rather ugly) default font.
#
# @return A font object.
def load_default():
"Load a default font."
from io import BytesIO
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import base64
f = ImageFont()
f._load_pilfont_data(
# courB08
BytesIO(base64.decodestring(b'''
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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//kABQABADcAAAA7AAgABgAAAAD/+QAFAAAAOwAAAEAABwAGAAAAAP/5AAYAAABAAAAARgAHAAYA
AAAA//kABQAAAEYAAABLAAcABgAAAAD/+QAFAAAASwAAAFAABwAGAAAAAP/5AAYAAABQAAAAVgAH
AAYAAAAA//kABQAAAFYAAABbAAcABgAAAAD/+QAFAAAAWwAAAGAABwAGAAAAAP/5AAUAAABgAAAA
ZQAHAAYAAAAA//kABQAAAGUAAABqAAcABgAAAAD/+QAFAAAAagAAAG8ABwAGAAAAAf/8AAMAAABv
AAAAcQAEAAYAAAAA//wAAwACAHEAAAB0AAYABgAAAAD/+gAE//8AdAAAAHgABQAGAAAAAP/7AAT/
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AP/6AAUAAACYAAAAnQAGAAYAAP////oABQAAAJ0AAACjAAYABgAA////+gAFAAAAowAAAKkABgAG
AAD////6AAUAAACpAAAArwAGAAYAAAAA//oABQAAAK8AAAC0AAYABgAA////+gAGAAAAtAAAALsA
BgAGAAAAAP/6AAQAAAC7AAAAvwAGAAYAAP////oABQAAAL8AAADFAAYABgAA////+gAGAAAAxQAA
AMwABgAGAAD////6AAUAAADMAAAA0gAGAAYAAP////oABQAAANIAAADYAAYABgAA////+gAGAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYAAAAB
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AABKAAoATwASAAYAAAAA//gABQAAAE8ACgBUABIABgAAAAD/+AAFAAAAVAAKAFkAEgAGAAAAAP/5
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EgAGAAAAAP/4AAUAAACMAAoAkQASAAYAAAAA//gABQAAAJEACgCWABIABgAAAAD/+QAFAAAAlgAK
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+QAGAAIAzgAKANUAEw==
''')), Image.open(BytesIO(base64.decodestring(b'''
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iVBORw0KGgoAAAANSUhEUgAAAx4AAAAUAQAAAAArMtZoAAAEwElEQVR4nABlAJr/AHVE4czCI/4u
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Bu2WfgPoAwzRAABAAAAAAACQgLz/3Uv4Gv+gX7BJgDeeGP6AAAD1NMDzKHD7ANWr3loYbxsAD791
NAADfcoIDyP44K/jv4Y63/Z+t98Ovt+ub4T48LAAAAD//wBlAJr/AuplMlADJAAAAGuAphWpqhMx
in0A/fRvAYBABPgBwBUgABBQ/sYAyv9g0bCHgOLoGAAAAAAAREAAwI7nr0ArYpow7aX8//9LaP/9
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AAD//2Ji2FrkY3iYpYC5qDeGgeEMAwPDvwQBBoYvcTwOVLMEAAAA//9isDBgkP///0EOg9z35v//
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w7IkEbzhVQAAAABJRU5ErkJggg==
'''))))
return f
if __name__ == "__main__":
# create font data chunk for embedding
import base64, os, sys
font = "../Images/courB08"
print(" f._load_pilfont_data(")
print(" # %s" % os.path.basename(font))
print(" BytesIO(base64.decodestring(b'''")
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base64.encode(open(font + ".pil", "rb"), sys.stdout)
print("''')), Image.open(BytesIO(base64.decodestring(b'''")
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base64.encode(open(font + ".pbm", "rb"), sys.stdout)
print("'''))))")