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unifont.py
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unifont.py
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import PIL.Image as Im
from numpy import *
import struct
REC_LEN = 33
BLANK = '0' * 32
def _bits(num):
return [num >> i & 1 for i in range(8)]
def bits(byte):
out = ''
try:
num = int(byte, 16)
except ValueError:
print '"%s"' % byte, 'HERE'
raise
for i in range(3, -1, -1):
bit = (num >> i) & 1
out += '-@'[bit]
return out
def bitstr(bytes):
return ''.join([bits(b) for b in bytes])
FILLER = chr(0) * 16
def reverse_chr(v):
out = 0
for i in range(8):
out += ((v >> i) & 1) << (7 - i);
return chr(out)
v = ord('v')
k = ord('k')
assert reverse_chr(ord(reverse_chr(v))) == chr(v)
assert not ord(reverse_chr(k)) == chr(k)
assert reverse_chr(ord(reverse_chr(k))) == chr(k)
def repack(s):
'''
return a struct packed string in 4-byte ints
'''
N = len(s)
vals = []
for i in range(0, N, 2):
val = int(s[i:i+2], 16)
vals.append(val)
out = ''.join(map(reverse_chr, vals))
if len(out) == 16:
out = chr(len(out)) + out + FILLER ## pad short chars
else:
assert len(out) == 32, '%s is not 16 or 32?! %s\n %s\n %s' % (len(out), s, out, vals)
out = chr(len(out)) + out
assert len(out) == REC_LEN, '%s != %s' % (len(out), REC_LEN)
return out
def unpack(s):
unic, data = s.strip().split(':')
unic = int(unic, 16)
N = len(data)
out = []
if N == 32:
w = 2
else:
w = 4
for i in range(16):
l = data[i * w:(i + 1) * w]
print ' ', bitstr(l)
print
HEX_FILE = open('unifont.hex')
def create_index(filename='unifont.index'):
index = open(filename, 'w')
n = 0
last = 0
for l in HEX_FILE.readlines():
unic = l[:4]
dec = int(unic, 16)
while last < dec - 1:
last += 1
print >> index, '%04x:ffffff' % (last,)
print >> index, '%s:%06x' % (unic, n)
n += len(l)
last = dec
def check_index(f, wff_filename='unifont.index'):
w = 12
HEX_FILE.seek(0)
index = open(wff_filename).readlines()
for i, l in enumerate(index):
unic, offset = l.split(':')
offset = int(offset, 16)
HEX_FILE.seek(offset)
if i != int(unic, 16):
print 'off in line %x' % i
# assert i == int(unic, 16), 'off in line %x' % i
def create_wff(out_filename='unifont.wff'):
'''
create a font file with each char the same taking up the same size: REC_LEN byes.
'''
import struct
wff = open(out_filename, 'wb')
last = 0
HEX_FILE.seek(0)
for l in HEX_FILE.readlines():
l = l.strip()
unic = l[:4]
dec = int(unic, 16)
data = l[5:]
while last < dec - 1: ## write blanks for all skipped chars
last += 1
wff.write(repack(BLANK))
wff.write(repack(data))
last = dec
print 'created', out_filename
# create_wff() ##only need to call once
def wff_to_hex(wff_file, idx):
'''
convert a wff char back into hex format
'''
wff_file.seek(idx * REC_LEN)
dat = wff_file.read(REC_LEN)
n_byte = ord(dat[0])
data = [ord(b) for b in dat[1:]]
s = ''.join(['%02x' % d for d in data])
return '%04x:%s' % (idx, s)
def to_array(wff_file, idx):
'''
read charcter at given index into an array
'''
wff_file.seek(idx * REC_LEN)
dat = wff_file.read(REC_LEN)
n_byte = ord(dat[0])
# width = 8 * (n_byte / 16) ### not used
dat = dat[1:1 + n_byte]
data = array([_bits(ord(b)) for b in dat])
return reshape(data, (16, -1))
def paste_char(wff_file, img, unic, x, y):
'''
paste a bitmap of char at unic indix at pos x, y into img
'''
dat = to_array(wff_file, unic)
ones = zeros((dat.shape[0], dat.shape[1]), 'uint8')
ones += (1 - dat) * 255
im = Im.fromarray(ones)
img.paste(im, (x, y))
return dat.shape[1]
def check_wff(wff_filename='unifont.wff'):
wff_file = open(wff_filename)
# bigIm = Im.new('RGBA', (260 * 16, 260 * 16), (255, 255, 255, 255)) ## was
bigIm = Im.new('1', (260 * 16, 260 * 16), 255)
for j in range(256):
paste_char(wff_file, bigIm, ord('%x' % (j // 16)), (j + 2) * 16, 0)
paste_char(wff_file, bigIm, ord('%x' % (j % 16)), (j + 2) * 16, 16)
for i in range(256):
paste_char(wff_file, bigIm, ord('%x' % (i // 16)), 0, (i + 2) * 16)
paste_char(wff_file, bigIm, ord('%x' % (i % 16)), 8, (i + 2) * 16)
## 79 -- 0-20
for i in range(256):
for j in range(256):
try:
paste_char(wff_file, bigIm, i * 256 + j, (j + 1) * 16, (i + 2) * 16)
except:
break
# bigIm.show()
bigIm.save('unifont.jpg')
print 'wrote unifont.jpg'
# check_wff() ## only call once
def addText(text, wff_file, im, x, y, bigascii=False):
'''
paste an image of text into im at position x, y.
if bigascii == True, then use large chars near end of UNIFONT file
'''
if bigascii:
utxt = ''.join([unichr(ord(c) + 0xfee0) for c in text])
addText(utxt, wff_file, im, x, y, bigascii=False)
else:
for unic in text:
x += paste_char(wff_file, im, ord(unic), x, y)
def addText__test__():
wff_file = open('unifont.wff')
im = Im.new('1', (264, 175), 255)
addText('JUSTIN', wff_file, im, 0, 0)
txt = 'Justin'
addText(txt, wff_file, im, 0, 20, bigascii=True)
im.show()
# addText__test__()