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Modernize code in t4b.py

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Fixes #1265225 [Update Orizon driver](https://bugs.launchpad.net/calibre/+bug/1265225)
This commit is contained in:
Kovid Goyal 2014-01-02 09:24:51 +05:30
parent 39dcf1e4db
commit 8e6ee68bd8
1 changed files with 13 additions and 16 deletions
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29
src/calibre/devices/cybook/t4b.py
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@ -1,20 +1,18 @@
# vim:fileencoding=utf-8
from __future__ import (unicode_literals, division, absolute_import,
print_function)
__license__ = 'GPL v3'
__copyright__ = '2013, Jellby <jellby at yahoo.com>'
'''
Write a t4b file to disk.
'''
import StringIO
from io import BytesIO
DEFAULT_T4B_DATA = ''
DEFAULT_T4B_DATA = b''
def reduce_color(c):
if (c < 0):
return 0
elif (c > 255):
return 15
else:
return c//16
return max(0, min(255, c))//16
def write_t4b(t4bfile, coverdata=None):
'''
@ -22,21 +20,20 @@ def write_t4b(t4bfile, coverdata=None):
coverdata is a string representation of a JPEG file.
'''
from PIL import Image
if coverdata != None:
coverdata = StringIO.StringIO(coverdata)
if coverdata is not None:
coverdata = BytesIO(coverdata)
cover = Image.open(coverdata).convert("L")
cover.thumbnail((96, 144), Image.ANTIALIAS)
t4bcover = Image.new('L', (96, 144), 'white')
x, y = cover.size
t4bcover.paste(cover, ((96-x)/2, (144-y)/2))
t4bcover.paste(cover, ((96-x)//2, (144-y)//2))
pxs = t4bcover.getdata()
t4bfile.write('t4bp')
for i in range(0,len(pxs),2):
byte = reduce_color(pxs[i])
byte = 16*byte + reduce_color(pxs[i+1])
t4bfile.write(chr(byte))
t4bfile.write(b't4bp')
data = (16 * reduce_color(pxs[i]) + reduce_color(pxs[i+1])
for i in xrange(0, len(pxs), 2))
t4bfile.write(bytes(bytearray(data)))
else:
t4bfile.write(DEFAULT_T4B_DATA)