Current File : //usr/lib/calibre/calibre/ebooks/docx/writer/fonts.py
#!/usr/bin/env python3
__license__ = 'GPL v3'
__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
from collections import defaultdict
from uuid import uuid4
from calibre.ebooks.oeb.base import OEB_STYLES
from calibre.ebooks.oeb.transforms.subset import find_font_face_rules
def obfuscate_font_data(data, key):
prefix = bytearray(data[:32])
key = bytearray(reversed(key.bytes))
prefix = bytes(bytearray(prefix[i]^key[i % len(key)] for i in range(len(prefix))))
return prefix + data[32:]
class FontsManager:
def __init__(self, namespace, oeb, opts):
self.namespace = namespace
self.oeb, self.log, self.opts = oeb, oeb.log, opts
def serialize(self, text_styles, fonts, embed_relationships, font_data_map):
makeelement = self.namespace.makeelement
font_families, seen = set(), set()
for ts in text_styles:
if ts.font_family:
lf = ts.font_family.lower()
if lf not in seen:
seen.add(lf)
font_families.add(ts.font_family)
family_map = {}
for family in sorted(font_families):
family_map[family] = makeelement(fonts, 'w:font', w_name=family)
embedded_fonts = []
for item in self.oeb.manifest:
if item.media_type in OEB_STYLES and hasattr(item.data, 'cssRules'):
embedded_fonts.extend(find_font_face_rules(item, self.oeb))
num = 0
face_map = defaultdict(set)
rel_map = {}
for ef in embedded_fonts:
ff = ef['font-family'][0]
if ff not in font_families:
continue
num += 1
bold = ef['weight'] > 400
italic = ef['font-style'] != 'normal'
tag = 'Regular'
if bold or italic:
tag = 'Italic'
if bold and italic:
tag = 'BoldItalic'
elif bold:
tag = 'Bold'
if tag in face_map[ff]:
continue
face_map[ff].add(tag)
font = family_map[ff]
key = uuid4()
item = ef['item']
rid = rel_map.get(item)
if rid is None:
rel_map[item] = rid = 'rId%d' % num
fname = 'fonts/font%d.odttf' % num
makeelement(embed_relationships, 'Relationship', Id=rid, Type=self.namespace.names['EMBEDDED_FONT'], Target=fname)
font_data_map['word/' + fname] = obfuscate_font_data(item.data, key)
makeelement(font, 'w:embed' + tag, r_id=rid,
w_fontKey='{%s}' % key.urn.rpartition(':')[-1].upper(),
w_subsetted="true" if self.opts.subset_embedded_fonts else "false")
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