112 lines
2.7 KiB
Python
112 lines
2.7 KiB
Python
|
#
|
||
|
|
# 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.
|
||
|
|
#
|
||
|
|
|
||
|
|
|
||
|
|
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))
|
||
|
|
|
||
|
|
|
||
|
|
class FontFile:
|
||
|
|
"""Base class for raster font file handlers."""
|
||
|
|
|
||
|
|
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(f";;;;;;{self.ysize};\n".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])
|