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- #
- # 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
-
-
- 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.
-
- class FontFile(object):
-
- bitmap = None
-
- def __init__(self):
-
- self.info = {}
- self.glyph = [None] * 256
-
- def __getitem__(self, ix):
- return self.glyph[ix]
-
- 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
-
- 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])
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