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PDF Output: Turn off font hinting in WebKit

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Requires a patched Qt WebKit, which will be available in the calibre 3
binary builds.
This commit is contained in:
Kovid Goyal 2016-09-02 14:45:56 +05:30
parent be785b1143
commit 01c21e3a2b
1 changed files with 26 additions and 21 deletions
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47
src/calibre/ebooks/conversion/plugins/pdf_output.py
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@ -120,29 +120,34 @@ class PDFOutput(OutputFormatPlugin):
def convert(self, oeb_book, output_path, input_plugin, opts, log): def convert(self, oeb_book, output_path, input_plugin, opts, log):
from calibre.gui2 import must_use_qt, load_builtin_fonts from calibre.gui2 import must_use_qt, load_builtin_fonts
must_use_qt() # Turn off hinting in WebKit (requires a patched build of QtWebKit)
load_builtin_fonts() os.environ['CALIBRE_WEBKIT_NO_HINTING'] = '1'
try:
must_use_qt()
load_builtin_fonts()
self.oeb = oeb_book self.oeb = oeb_book
self.input_plugin, self.opts, self.log = input_plugin, opts, log self.input_plugin, self.opts, self.log = input_plugin, opts, log
self.output_path = output_path self.output_path = output_path
from calibre.ebooks.oeb.base import OPF, OPF2_NS from calibre.ebooks.oeb.base import OPF, OPF2_NS
from lxml import etree from lxml import etree
from io import BytesIO from io import BytesIO
package = etree.Element(OPF('package'), package = etree.Element(OPF('package'),
attrib={'version': '2.0', 'unique-identifier': 'dummy'}, attrib={'version': '2.0', 'unique-identifier': 'dummy'},
nsmap={None: OPF2_NS}) nsmap={None: OPF2_NS})
from calibre.ebooks.metadata.opf2 import OPF from calibre.ebooks.metadata.opf2 import OPF
self.oeb.metadata.to_opf2(package) self.oeb.metadata.to_opf2(package)
self.metadata = OPF(BytesIO(etree.tostring(package))).to_book_metadata() self.metadata = OPF(BytesIO(etree.tostring(package))).to_book_metadata()
self.cover_data = None self.cover_data = None
if input_plugin.is_image_collection: if input_plugin.is_image_collection:
log.debug('Converting input as an image collection...') log.debug('Converting input as an image collection...')
self.convert_images(input_plugin.get_images()) self.convert_images(input_plugin.get_images())
else: else:
log.debug('Converting input as a text based book...') log.debug('Converting input as a text based book...')
self.convert_text(oeb_book) self.convert_text(oeb_book)
finally:
os.environ.pop('CALIBRE_WEBKIT_NO_HINTING', None)
def convert_images(self, images): def convert_images(self, images):
from calibre.ebooks.pdf.writer import ImagePDFWriter from calibre.ebooks.pdf.writer import ImagePDFWriter