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When rendering EPUB covers on OS X remove @font-face rules as well to prevent multi-render crashes

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This commit is contained in:
Kovid Goyal 2012-02-06 10:10:42 +05:30
parent 1f97500e84
commit 86ad40298a
1 changed files with 30 additions and 7 deletions
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37
src/calibre/ebooks/metadata/epub.py
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@ -142,17 +142,40 @@ def render_cover(opf, opf_path, zf, reader=None):
with TemporaryDirectory('_epub_meta') as tdir: with TemporaryDirectory('_epub_meta') as tdir:
with CurrentDir(tdir): with CurrentDir(tdir):
zf.extractall() zf.extractall()
if isosx:
# On OS X trying to render an HTML cover which uses embedded
# fonts more than once in the same process causes a crash in Qt
# so be safe and remove the fonts.
for f in walk('.'):
if os.path.splitext(f)[1].lower() in ('.ttf', '.otf'):
os.remove(f)
opf_path = opf_path.replace('/', os.sep) opf_path = opf_path.replace('/', os.sep)
cpage = os.path.join(tdir, os.path.dirname(opf_path), cpage) cpage = os.path.join(tdir, os.path.dirname(opf_path), cpage)
if not os.path.exists(cpage): if not os.path.exists(cpage):
return return
if isosx:
# On OS X trying to render a HTML cover which uses embedded
# fonts more than once in the same process causes a crash in Qt
# so be safe and remove the fonts as well as any @font-face
# rules
for f in walk('.'):
if os.path.splitext(f)[1].lower() in ('.ttf', '.otf'):
os.remove(f)
ffpat = re.compile(br'@font-face.*?{.*?}',
re.DOTALL|re.IGNORECASE)
with open(cpage, 'r+b') as f:
raw = f.read()
f.truncate(0)
raw = ffpat.sub(b'', raw)
f.write(raw)
from calibre.ebooks.chardet import xml_to_unicode
raw = xml_to_unicode(raw,
strip_encoding_pats=True, resolve_entities=True)[0]
from lxml import html
for link in html.fromstring(raw).xpath('//link'):
href = link.get('href', '')
if href:
path = os.path.join(os.path.dirname(cpage), href)
if os.path.exists(path):
with open(path, 'r+b') as f:
raw = f.read()
f.truncate(0)
raw = ffpat.sub(b'', raw)
f.write(raw)
return render_html_svg_workaround(cpage, default_log) return render_html_svg_workaround(cpage, default_log)
def get_cover(opf, opf_path, stream, reader=None): def get_cover(opf, opf_path, stream, reader=None):