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PDF Output: Add support for font-family aliasing in @font-face rules. Fixes #1395176 [truetype fonts with formatting not translating from EPUB to PDF](https://bugs.launchpad.net/calibre/+bug/1395176)

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This commit is contained in:
Kovid Goyal 2014-11-22 08:56:11 +05:30
parent e3d95929ac
commit b2d36cfcf0
1 changed files with 26 additions and 62 deletions
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88
src/calibre/ebooks/conversion/plugins/pdf_output.py
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@ -157,29 +157,26 @@ class PDFOutput(OutputFormatPlugin):
self.cover_data = item.data
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.
'''
''' On windows, Qt uses GDI which does not support OpenType
(CFF) fonts, so we need to nuke references to OpenType
fonts. Qt's directwrite text backend is not mature.
Also make sure all fonts are embeddable. '''
from calibre.ebooks.oeb.base import urlnormalize
from calibre.utils.fonts.utils import remove_embed_restriction
from PyQt5.Qt import QFontDatabase, QByteArray, QRawFont, QFont
from PyQt5.Qt import QByteArray, QRawFont
# First find all @font-face rules and remove them, adding the embedded
# fonts to Qt
family_map = {}
font_warnings = set()
processed = set()
is_cff = {}
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)
@ -187,62 +184,29 @@ class PDFOutput(OutputFormatPlugin):
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:
raw = nraw = ff.data
if path not in processed:
processed.add(path)
try:
family_name = unicode(QFontDatabase.applicationFontFamilies(fid)[0])
except (IndexError, KeyError):
pass
if family_name:
family_map[icu_lower(font_family)] = family_name
nraw = remove_embed_restriction(raw)
except:
continue
if nraw != raw:
ff.data = nraw
self.oeb.container.write(path, nraw)
if iswindows:
if path not in is_cff:
f = QRawFont(QByteArray(nraw), 12)
is_cff[path] = f.isValid() and len(f.fontTable('head')) == 0
if is_cff[path]:
if path not in font_warnings:
font_warnings.add(path)
self.log.warn('CFF OpenType fonts are not supported on windows, ignoring: %s' % path)
remove.add(i)
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 convert_text(self, oeb_book):
from calibre.ebooks.metadata.opf2 import OPF
if self.opts.old_pdf_engine: