def handle_embedded_fonts(self):
'''
Because of QtWebKit's inability to handle embedded fonts correctly, we
remove the embedded fonts and make them available system wide instead.
If you ever move to Qt WebKit 2.3+ then this will be unnecessary.
'''
from calibre.ebooks.oeb.base import urlnormalize
from calibre.utils.fonts.utils import remove_embed_restriction
from PyQt5.Qt import QFontDatabase, QByteArray, QRawFont, QFont
# First find all @font-face rules and remove them, adding the embedded
# fonts to Qt
family_map = {}
for item in list(self.oeb.manifest):
if not hasattr(item.data, 'cssRules'):
continue
remove = set()
for i, rule in enumerate(item.data.cssRules):
if rule.type == rule.FONT_FACE_RULE:
remove.add(i)
try:
s = rule.style
src = s.getProperty('src').propertyValue[0].uri
font_family = s.getProperty('font-family').propertyValue[0].value
except:
continue
path = item.abshref(src)
ff = self.oeb.manifest.hrefs.get(urlnormalize(path), None)
if ff is None:
continue
raw = ff.data
self.oeb.manifest.remove(ff)
try:
raw = remove_embed_restriction(raw)
except:
continue
fid = QFontDatabase.addApplicationFontFromData(QByteArray(raw))
family_name = None
if fid > -1:
try:
family_name = unicode(QFontDatabase.applicationFontFamilies(fid)[0])
except (IndexError, KeyError):
pass
if family_name:
family_map[icu_lower(font_family)] = family_name
for i in sorted(remove, reverse=True):
item.data.cssRules.pop(i)
# Now map the font family name specified in the css to the actual
# family name of the embedded font (they may be different in general).
font_warnings = set()
for item in self.oeb.manifest:
if not hasattr(item.data, 'cssRules'):
continue
for i, rule in enumerate(item.data.cssRules):
if rule.type != rule.STYLE_RULE:
continue
ff = rule.style.getProperty('font-family')
if ff is None:
continue
val = ff.propertyValue
for i in xrange(val.length):
try:
k = icu_lower(val[i].value)
except (AttributeError, TypeError):
val[i].value = k = 'times'
if k in family_map:
val[i].value = family_map[k]
if iswindows:
# On windows, Qt uses GDI which does not support OpenType
# (CFF) fonts, so we need to nuke references to OpenType
# fonts. Note that you could compile QT with configure
# -directwrite, but that requires atleast Vista SP2
for i in xrange(val.length):
family = val[i].value
if family:
f = QRawFont.fromFont(QFont(family))
if len(f.fontTable('head')) == 0:
if family not in font_warnings:
self.log.warn('Ignoring unsupported font: %s'
%family)
font_warnings.add(family)
# Either a bitmap or (more likely) a CFF font
val[i].value = 'times'
def handle_embedded_fonts(self):
'''
Because of QtWebKit's inability to handle embedded fonts correctly, we
remove the embedded fonts and make them available system wide instead.
If you ever move to Qt WebKit 2.3+ then this will be unnecessary.
'''
from calibre.ebooks.oeb.base import urlnormalize
from calibre.utils.fonts.utils import remove_embed_restriction
from PyQt5.Qt import QFontDatabase, QByteArray, QRawFont, QFont
# First find all @font-face rules and remove them, adding the embedded
# fonts to Qt
family_map = {}
for item in list(self.oeb.manifest):
if not hasattr(item.data, 'cssRules'):
continue
remove = set()
for i, rule in enumerate(item.data.cssRules):
if rule.type == rule.FONT_FACE_RULE:
remove.add(i)
try:
s = rule.style
src = s.getProperty('src').propertyValue[0].uri
font_family = s.getProperty(
'font-family').propertyValue[0].value
except:
continue
path = item.abshref(src)
ff = self.oeb.manifest.hrefs.get(urlnormalize(path), None)
if ff is None:
continue
raw = ff.data
self.oeb.manifest.remove(ff)
try:
raw = remove_embed_restriction(raw)
except:
continue
fid = QFontDatabase.addApplicationFontFromData(
QByteArray(raw))
family_name = None
if fid > -1:
try:
family_name = unicode(
QFontDatabase.applicationFontFamilies(fid)[0])
except (IndexError, KeyError):
pass
if family_name:
family_map[icu_lower(font_family)] = family_name
for i in sorted(remove, reverse=True):
item.data.cssRules.pop(i)
# Now map the font family name specified in the css to the actual
# family name of the embedded font (they may be different in general).
font_warnings = set()
for item in self.oeb.manifest:
if not hasattr(item.data, 'cssRules'):
continue
for i, rule in enumerate(item.data.cssRules):
if rule.type != rule.STYLE_RULE:
continue
ff = rule.style.getProperty('font-family')
if ff is None:
continue
val = ff.propertyValue
for i in xrange(val.length):
try:
k = icu_lower(val[i].value)
except (AttributeError, TypeError):
val[i].value = k = 'times'
if k in family_map:
val[i].value = family_map[k]
if iswindows:
# On windows, Qt uses GDI which does not support OpenType
# (CFF) fonts, so we need to nuke references to OpenType
# fonts. Note that you could compile QT with configure
# -directwrite, but that requires atleast Vista SP2
for i in xrange(val.length):
family = val[i].value
if family:
f = QRawFont.fromFont(QFont(family))
if len(f.fontTable('head')) == 0:
if family not in font_warnings:
self.log.warn(
'Ignoring unsupported font: %s' %
family)
font_warnings.add(family)
# Either a bitmap or (more likely) a CFF font
val[i].value = 'times'
