Source code for PIL.FontFile

#
# The Python Imaging Library
# $Id$
#
# base class for raster font file parsers
#
# history:
# 1997-06-05 fl   created
# 1997-08-19 fl   restrict image width
#
# Copyright (c) 1997-1998 by Secret Labs AB
# Copyright (c) 1997-1998 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#

from __future__ import print_function

import os
from . import Image, _binary

WIDTH = 800


[docs]def puti16(fp, values): # write network order (big-endian) 16-bit sequence for v in values: if v < 0: v += 65536 fp.write(_binary.o16be(v))
## # Base class for raster font file handlers.
[docs]class FontFile(object): bitmap = None def __init__(self): self.info = {} self.glyph = [None] * 256 def __getitem__(self, ix): return self.glyph[ix]
[docs] def compile(self): "Create metrics and bitmap" if self.bitmap: return # create bitmap large enough to hold all data h = w = maxwidth = 0 lines = 1 for glyph in self: if glyph: d, dst, src, im = glyph h = max(h, src[3] - src[1]) w = w + (src[2] - src[0]) if w > WIDTH: lines += 1 w = (src[2] - src[0]) maxwidth = max(maxwidth, w) xsize = maxwidth ysize = lines * h if xsize == 0 and ysize == 0: return "" self.ysize = h # paste glyphs into bitmap self.bitmap = Image.new("1", (xsize, ysize)) self.metrics = [None] * 256 x = y = 0 for i in range(256): glyph = self[i] if glyph: d, dst, src, im = glyph xx = src[2] - src[0] # yy = src[3] - src[1] x0, y0 = x, y x = x + xx if x > WIDTH: x, y = 0, y + h x0, y0 = x, y x = xx s = src[0] + x0, src[1] + y0, src[2] + x0, src[3] + y0 self.bitmap.paste(im.crop(src), s) self.metrics[i] = d, dst, s
[docs] def save(self, filename): "Save font" self.compile() # font data self.bitmap.save(os.path.splitext(filename)[0] + ".pbm", "PNG") # font metrics with open(os.path.splitext(filename)[0] + ".pil", "wb") as fp: fp.write(b"PILfont\n") fp.write((";;;;;;%d;\n" % self.ysize).encode('ascii')) # HACK!!! fp.write(b"DATA\n") for id in range(256): m = self.metrics[id] if not m: puti16(fp, [0] * 10) else: puti16(fp, m[0] + m[1] + m[2])