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Diffstat (limited to 'PIL/ImageFont.py')
| -rw-r--r-- | PIL/ImageFont.py | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/PIL/ImageFont.py b/PIL/ImageFont.py new file mode 100644 index 0000000..b987a33 --- /dev/null +++ b/PIL/ImageFont.py @@ -0,0 +1,377 @@ +# +# The Python Imaging Library. +# $Id: ImageFont.py 2813 2006-10-07 10:11:35Z fredrik $ +# +# 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. +# + +import Image +import os, string, sys + +# 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() != "PILfont\n": + raise SyntaxError("Not a PILfont file") + d = string.split(file.readline(), ";") + self.info = [] # FIXME: should be a dictionary + s = file.readline() + while s and s != "DATA\n": + 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)" + + def __init__(self, file, size, index=0, encoding=""): + # FIXME: use service provider instead + import _imagingft + self.font = _imagingft.getfont(file, size, index, encoding) + + 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. + +def truetype(filename, size, index=0, encoding=""): + "Load a truetype font file." + try: + return FreeTypeFont(filename, size, index, encoding) + 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: + filename = os.path.join(windir, "fonts", filename) + return FreeTypeFont(filename, size, index, encoding) + 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 StringIO import StringIO + import base64 + f = ImageFont() + f._load_pilfont_data( + # courB08 + StringIO(base64.decodestring(''' +UElMZm9udAo7Ozs7OzsxMDsKREFUQQoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA +AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA +AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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+AAD//2Ji2FrkY3iYpYC5qDeGgeEMAwPDvwQBBoYvcTwOVLMEAAAA//9isDBgkP///0EOg9z35v// +Gc/eeW7BwPj5+QGZhANUswMAAAD//2JgqGBgYGBgqEMXlvhMPUsAAAAA//8iYDd1AAAAAP//AwDR +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 " StringIO(base64.decodestring('''" + base64.encode(open(font + ".pil", "rb"), sys.stdout) + print "''')), Image.open(StringIO(base64.decodestring('''" + base64.encode(open(font + ".pbm", "rb"), sys.stdout) + print "'''))))" |