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Pillow/PIL/ImageFont.py

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Forking PIL
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.
#
py3k: print is a function Seriously, if you didn't know that, you've been in a freaking cave, man.
2012-10-16 06:27:35 +04:00
from __future__ import print_function
Fix imports
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from PIL import Image
py3k: Use string methods instead of string module First, we go for the obvious stuff. The string module methods are gone in 3.0, so we translate them to the appropriate methods on the string class.
2012-10-11 02:11:13 +04:00
import os, sys
Better unity with Image.py file (on string type testing and warnings)
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try:
import warnings
except ImportError:
warnings = None
Forking PIL
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class _imagingft_not_installed:
# module placeholder
def __getattr__(self, id):
raise ImportError("The _imagingft C module is not installed")
try:
Better import of _imagingft
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import _imagingft as core
Forking PIL
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except ImportError:
core = _imagingft_not_installed()
Better unity with Image.py file (on string type testing and warnings)
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if bytes is str:
def isStringType(t):
return isinstance(t, basestring)
else:
def isStringType(t):
return isinstance(t, str)
Adding Python3 basestring compatibility without changing basestring
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Forking PIL
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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
py3k: The big push There are two main issues fixed with this commit: * bytes vs. str: All file, image, and palette data are now handled as bytes. A new _binary module consolidates the hacks needed to do this across Python versions. tostring/fromstring methods have been renamed to tobytes/frombytes, but the Python 2.6/2.7 versions alias them to the old names for compatibility. Users should move to tobytes/frombytes. One other potentially-breaking change is that text data in image files (such as tags, comments) are now explicitly handled with a specific character encoding in mind. This works well with the Unicode str in Python 3, but may trip up old code expecting a straight byte-for-byte translation to a Python string. This also required a change to Gohlke's tags tests (in Tests/test_file_png.py) to expect Unicode strings from the code. * True div vs. floor div: Many division operations used the "/" operator to do floor division, which is now the "//" operator in Python 3. These were fixed. As of this commit, on the first pass, I have one failing test (improper handling of a slice object in a C module, test_imagepath.py) in Python 3, and three that that I haven't tried running yet (test_imagegl, test_imagegrab, and test_imageqt). I also haven't tested anything on Windows. All but the three skipped tests run flawlessly against Pythons 2.6 and 2.7.
2012-10-21 01:01:53 +04:00
if file.readline() != b"PILfont\n":
Forking PIL
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raise SyntaxError("Not a PILfont file")
py3k: The big push There are two main issues fixed with this commit: * bytes vs. str: All file, image, and palette data are now handled as bytes. A new _binary module consolidates the hacks needed to do this across Python versions. tostring/fromstring methods have been renamed to tobytes/frombytes, but the Python 2.6/2.7 versions alias them to the old names for compatibility. Users should move to tobytes/frombytes. One other potentially-breaking change is that text data in image files (such as tags, comments) are now explicitly handled with a specific character encoding in mind. This works well with the Unicode str in Python 3, but may trip up old code expecting a straight byte-for-byte translation to a Python string. This also required a change to Gohlke's tags tests (in Tests/test_file_png.py) to expect Unicode strings from the code. * True div vs. floor div: Many division operations used the "/" operator to do floor division, which is now the "//" operator in Python 3. These were fixed. As of this commit, on the first pass, I have one failing test (improper handling of a slice object in a C module, test_imagepath.py) in Python 3, and three that that I haven't tried running yet (test_imagegl, test_imagegrab, and test_imageqt). I also haven't tested anything on Windows. All but the three skipped tests run flawlessly against Pythons 2.6 and 2.7.
2012-10-21 01:01:53 +04:00
d = file.readline().split(b";")
Forking PIL
2010-07-31 06:52:47 +04:00
self.info = [] # FIXME: should be a dictionary
while True:
s = file.readline()
py3k: The big push There are two main issues fixed with this commit: * bytes vs. str: All file, image, and palette data are now handled as bytes. A new _binary module consolidates the hacks needed to do this across Python versions. tostring/fromstring methods have been renamed to tobytes/frombytes, but the Python 2.6/2.7 versions alias them to the old names for compatibility. Users should move to tobytes/frombytes. One other potentially-breaking change is that text data in image files (such as tags, comments) are now explicitly handled with a specific character encoding in mind. This works well with the Unicode str in Python 3, but may trip up old code expecting a straight byte-for-byte translation to a Python string. This also required a change to Gohlke's tags tests (in Tests/test_file_png.py) to expect Unicode strings from the code. * True div vs. floor div: Many division operations used the "/" operator to do floor division, which is now the "//" operator in Python 3. These were fixed. As of this commit, on the first pass, I have one failing test (improper handling of a slice object in a C module, test_imagepath.py) in Python 3, and three that that I haven't tried running yet (test_imagegl, test_imagegrab, and test_imageqt). I also haven't tested anything on Windows. All but the three skipped tests run flawlessly against Pythons 2.6 and 2.7.
2012-10-21 01:01:53 +04:00
if not s or s == b"DATA\n":
Forking PIL
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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)"
Removing buffer from imagefont
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def __init__(self, font=None, size=10, index=0, encoding="", file=None):
Forking PIL
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# FIXME: use service provider instead
Removing buffer from imagefont
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if file:
Better unity with Image.py file (on string type testing and warnings)
2013-04-26 00:32:43 +04:00
if warnings:
warnings.warn('file parameter deprecated, please use font parameter instead.', DeprecationWarning)
Removing buffer from imagefont
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font = file
Better unity with Image.py file (on string type testing and warnings)
2013-04-26 00:32:43 +04:00
if isStringType(font):
Removing buffer from imagefont
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self.font = core.getfont(font, size, index, encoding)
else:
Buffer lifetime needs to be the same as the font lifetime
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self.font_bytes = font.read()
self.font = core.getfont("", size, index, encoding, self.font_bytes)
Forking PIL
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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.
Removing buffer from imagefont
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def truetype(font=None, size=10, index=0, encoding="", filename=None):
Forking PIL
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"Load a truetype font file."
Removing buffer from imagefont
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if filename:
Better unity with Image.py file (on string type testing and warnings)
2013-04-26 00:32:43 +04:00
if warnings:
warnings.warn('filename parameter deprecated, please use font parameter instead.', DeprecationWarning)
Removing buffer from imagefont
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font = filename
Forking PIL
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try:
Removing buffer from imagefont
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return FreeTypeFont(font, size, index, encoding)
Forking PIL
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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:
Removing buffer from imagefont
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filename = os.path.join(windir, "fonts", font)
return FreeTypeFont(font, size, index, encoding)
Forking PIL
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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."
py3k: Convert StringIO.StringIO to io.BytesIO io.BytesIO is already in 2.6. Some of the more obvious bytes literals are marked in this commit.
2012-10-17 07:01:19 +04:00
from io import BytesIO
Forking PIL
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import base64
f = ImageFont()
f._load_pilfont_data(
# courB08
py3k: Convert StringIO.StringIO to io.BytesIO io.BytesIO is already in 2.6. Some of the more obvious bytes literals are marked in this commit.
2012-10-17 07:01:19 +04:00
BytesIO(base64.decodestring(b'''
Forking PIL
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py3k: Convert StringIO.StringIO to io.BytesIO io.BytesIO is already in 2.6. Some of the more obvious bytes literals are marked in this commit.
2012-10-17 07:01:19 +04:00
''')), Image.open(BytesIO(base64.decodestring(b'''
Forking PIL
2010-07-31 06:52:47 +04:00
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'''))))
return f
if __name__ == "__main__":
# create font data chunk for embedding
import base64, os, sys
font = "../Images/courB08"
py3k: print is a function Seriously, if you didn't know that, you've been in a freaking cave, man.
2012-10-16 06:27:35 +04:00
print(" f._load_pilfont_data(")
print(" # %s" % os.path.basename(font))
py3k: Convert StringIO.StringIO to io.BytesIO io.BytesIO is already in 2.6. Some of the more obvious bytes literals are marked in this commit.
2012-10-17 07:01:19 +04:00
print(" BytesIO(base64.decodestring(b'''")
Forking PIL
2010-07-31 06:52:47 +04:00
base64.encode(open(font + ".pil", "rb"), sys.stdout)
py3k: Convert StringIO.StringIO to io.BytesIO io.BytesIO is already in 2.6. Some of the more obvious bytes literals are marked in this commit.
2012-10-17 07:01:19 +04:00
print("''')), Image.open(BytesIO(base64.decodestring(b'''")
Forking PIL
2010-07-31 06:52:47 +04:00
base64.encode(open(font + ".pbm", "rb"), sys.stdout)
py3k: print is a function Seriously, if you didn't know that, you've been in a freaking cave, man.
2012-10-16 06:27:35 +04:00
print("'''))))")
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