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Move Qt initialization to earlier in the conversion pipeline

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Kovid Goyal 2019-07-08 09:37:05 +05:30
parent 9315b2bec4
commit d52134a6cd
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1 changed files with 15 additions and 3 deletions
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18
src/calibre/ebooks/conversion/plugins/pdf_output.py
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@ -156,15 +156,27 @@ class PDFOutput(OutputFormatPlugin):
} }
def specialize_options(self, log, opts, input_fmt): def specialize_options(self, log, opts, input_fmt):
# Ensure Qt is setup to be used with WebEngine
# specialize_options is called early enough in the pipeline
# that hopefully no Qt application has been constructed as yet
from PyQt5.QtWebEngineCore import QWebEngineUrlScheme
from PyQt5.QtWebEngineWidgets import QWebEnginePage # noqa
from calibre.gui2 import must_use_qt, load_builtin_fonts
from calibre.constants import FAKE_PROTOCOL
scheme = QWebEngineUrlScheme(FAKE_PROTOCOL.encode('ascii'))
scheme.setSyntax(QWebEngineUrlScheme.Syntax.Host)
scheme.setFlags(QWebEngineUrlScheme.SecureScheme)
QWebEngineUrlScheme.registerScheme(scheme)
must_use_qt()
load_builtin_fonts()
self.input_fmt = input_fmt
if opts.pdf_use_document_margins: if opts.pdf_use_document_margins:
# Prevent the conversion pipeline from overwriting document margins # Prevent the conversion pipeline from overwriting document margins
opts.margin_left = opts.margin_right = opts.margin_top = opts.margin_bottom = -1 opts.margin_left = opts.margin_right = opts.margin_top = opts.margin_bottom = -1
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
self.stored_page_margins = getattr(opts, '_stored_page_margins', {}) self.stored_page_margins = getattr(opts, '_stored_page_margins', {})
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