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ebook-converter/ebook_converter/ebooks/conversion/plugins/pdf_output.py
gryf 0f9792df36 Convert calibre modules to ebook_converter. 
Here is the first batch of modules, which are needed for converting
several formats to LRF. Some of the logic has been change, more cleanups
will follow.
2020-04-19 15:16:48 +02:00

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# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function, unicode_literals
__license__ = 'GPL 3'
__copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
__docformat__ = 'restructuredtext en'
'''
Convert OEB ebook format to PDF.
'''
import glob, os
from ebook_converter.customize.conversion import (OutputFormatPlugin,
OptionRecommendation)
from ebook_converter.ptempfile import TemporaryDirectory
from ebook_converter.polyglot.builtins import iteritems, unicode_type
UNITS = ('millimeter', 'centimeter', 'point', 'inch' , 'pica' , 'didot',
'cicero', 'devicepixel')
PAPER_SIZES = ('a0', 'a1', 'a2', 'a3', 'a4', 'a5', 'a6', 'b0', 'b1',
'b2', 'b3', 'b4', 'b5', 'b6', 'legal', 'letter')
class PDFOutput(OutputFormatPlugin):
name = 'PDF Output'
author = 'Kovid Goyal'
file_type = 'pdf'
commit_name = 'pdf_output'
ui_data = {'paper_sizes': PAPER_SIZES, 'units': UNITS, 'font_types': ('serif', 'sans', 'mono')}
options = {
OptionRecommendation(name='use_profile_size', recommended_value=False,
help=_('Instead of using the paper size specified in the PDF Output options,'
' use a paper size corresponding to the current output profile.'
' Useful if you want to generate a PDF for viewing on a specific device.')),
OptionRecommendation(name='unit', recommended_value='inch',
level=OptionRecommendation.LOW, short_switch='u', choices=UNITS,
help=_('The unit of measure for page sizes. Default is inch. Choices '
'are {} '
'Note: This does not override the unit for margins!').format(', '.join(UNITS))),
OptionRecommendation(name='paper_size', recommended_value='letter',
level=OptionRecommendation.LOW, choices=PAPER_SIZES,
help=_('The size of the paper. This size will be overridden when a '
'non default output profile is used. Default is letter. Choices '
'are {}').format(', '.join(PAPER_SIZES))),
OptionRecommendation(name='custom_size', recommended_value=None,
help=_('Custom size of the document. Use the form widthxheight '
'e.g. `123x321` to specify the width and height. '
'This overrides any specified paper-size.')),
OptionRecommendation(name='preserve_cover_aspect_ratio',
recommended_value=False,
help=_('Preserve the aspect ratio of the cover, instead'
' of stretching it to fill the full first page of the'
' generated pdf.')),
OptionRecommendation(name='pdf_serif_family',
recommended_value='Times', help=_(
'The font family used to render serif fonts. Will work only if the font is available system-wide.')),
OptionRecommendation(name='pdf_sans_family',
recommended_value='Helvetica', help=_(
'The font family used to render sans-serif fonts. Will work only if the font is available system-wide.')),
OptionRecommendation(name='pdf_mono_family',
recommended_value='Courier', help=_(
'The font family used to render monospace fonts. Will work only if the font is available system-wide.')),
OptionRecommendation(name='pdf_standard_font', choices=ui_data['font_types'],
recommended_value='serif', help=_(
'The font family used to render monospace fonts')),
OptionRecommendation(name='pdf_default_font_size',
recommended_value=20, help=_(
'The default font size')),
OptionRecommendation(name='pdf_mono_font_size',
recommended_value=16, help=_(
'The default font size for monospaced text')),
OptionRecommendation(name='pdf_hyphenate', recommended_value=False,
help=_('Break long words at the end of lines. This can give the text at the right margin a more even appearance.')),
OptionRecommendation(name='pdf_mark_links', recommended_value=False,
help=_('Surround all links with a red box, useful for debugging.')),
OptionRecommendation(name='pdf_page_numbers', recommended_value=False,
help=_('Add page numbers to the bottom of every page in the generated PDF file. If you '
'specify a footer template, it will take precedence '
'over this option.')),
OptionRecommendation(name='pdf_footer_template', recommended_value=None,
help=_('An HTML template used to generate %s on every page.'
' The strings _PAGENUM_, _TITLE_, _AUTHOR_ and _SECTION_ will be replaced by their current values.')%_('footers')),
OptionRecommendation(name='pdf_header_template', recommended_value=None,
help=_('An HTML template used to generate %s on every page.'
' The strings _PAGENUM_, _TITLE_, _AUTHOR_ and _SECTION_ will be replaced by their current values.')%_('headers')),
OptionRecommendation(name='pdf_add_toc', recommended_value=False,
help=_('Add a Table of Contents at the end of the PDF that lists page numbers. '
'Useful if you want to print out the PDF. If this PDF is intended for electronic use, use the PDF Outline instead.')),
OptionRecommendation(name='toc_title', recommended_value=None,
help=_('Title for generated table of contents.')
),
OptionRecommendation(name='pdf_page_margin_left', recommended_value=72.0,
level=OptionRecommendation.LOW,
help=_('The size of the left page margin, in pts. Default is 72pt.'
' Overrides the common left page margin setting.')
),
OptionRecommendation(name='pdf_page_margin_top', recommended_value=72.0,
level=OptionRecommendation.LOW,
help=_('The size of the top page margin, in pts. Default is 72pt.'
' Overrides the common top page margin setting, unless set to zero.')
),
OptionRecommendation(name='pdf_page_margin_right', recommended_value=72.0,
level=OptionRecommendation.LOW,
help=_('The size of the right page margin, in pts. Default is 72pt.'
' Overrides the common right page margin setting, unless set to zero.')
),
OptionRecommendation(name='pdf_page_margin_bottom', recommended_value=72.0,
level=OptionRecommendation.LOW,
help=_('The size of the bottom page margin, in pts. Default is 72pt.'
' Overrides the common bottom page margin setting, unless set to zero.')
),
OptionRecommendation(name='pdf_use_document_margins', recommended_value=False,
help=_('Use the page margins specified in the input document via @page CSS rules.'
' This will cause the margins specified in the conversion settings to be ignored.'
' If the document does not specify page margins, the conversion settings will be used as a fallback.')
),
OptionRecommendation(name='pdf_page_number_map', recommended_value=None,
help=_('Adjust page numbers, as needed. Syntax is a JavaScript expression for the page number.'
' For example, "if (n < 3) 0; else n - 3;", where n is current page number.')
),
OptionRecommendation(name='uncompressed_pdf',
recommended_value=False, help=_(
'Generate an uncompressed PDF, useful for debugging.')
),
OptionRecommendation(name='pdf_odd_even_offset', recommended_value=0.0,
level=OptionRecommendation.LOW,
help=_(
'Shift the text horizontally by the specified offset (in pts).'
' On odd numbered pages, it is shifted to the right and on even'
' numbered pages to the left. Use negative numbers for the opposite'
' effect. Note that this setting is ignored on pages where the margins'
' are smaller than the specified offset. Shifting is done by setting'
' the PDF CropBox, not all software respects the CropBox.'
)
),
}
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 ebook_converter.gui2 import must_use_qt
from ebook_converter.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()
self.input_fmt = input_fmt
if opts.pdf_use_document_margins:
# Prevent the conversion pipeline from overwriting document margins
opts.margin_left = opts.margin_right = opts.margin_top = opts.margin_bottom = -1
def convert(self, oeb_book, output_path, input_plugin, opts, log):
self.stored_page_margins = getattr(opts, '_stored_page_margins', {})
self.oeb = oeb_book
self.input_plugin, self.opts, self.log = input_plugin, opts, log
self.output_path = output_path
from ebook_converter.ebooks.oeb.base import OPF, OPF2_NS
from lxml import etree
from io import BytesIO
package = etree.Element(OPF('package'),
attrib={'version': '2.0', 'unique-identifier': 'dummy'},
nsmap={None: OPF2_NS})
from ebook_converter.ebooks.metadata.opf2 import OPF
self.oeb.metadata.to_opf2(package)
self.metadata = OPF(BytesIO(etree.tostring(package))).to_book_metadata()
self.cover_data = None
if input_plugin.is_image_collection:
log.debug('Converting input as an image collection...')
self.convert_images(input_plugin.get_images())
else:
log.debug('Converting input as a text based book...')
self.convert_text(oeb_book)
def convert_images(self, images):
from ebook_converter.ebooks.pdf.image_writer import convert
convert(images, self.output_path, self.opts, self.metadata, self.report_progress)
def get_cover_data(self):
oeb = self.oeb
if (oeb.metadata.cover and unicode_type(oeb.metadata.cover[0]) in oeb.manifest.ids):
cover_id = unicode_type(oeb.metadata.cover[0])
item = oeb.manifest.ids[cover_id]
self.cover_data = item.data
def process_fonts(self):
''' Make sure all fonts are embeddable '''
from ebook_converter.ebooks.oeb.base import urlnormalize
from ebook_converter.utils.fonts.utils import remove_embed_restriction
processed = set()
for item in list(self.oeb.manifest):
if not hasattr(item.data, 'cssRules'):
continue
for i, rule in enumerate(item.data.cssRules):
if rule.type == rule.FONT_FACE_RULE:
try:
s = rule.style
src = s.getProperty('src').propertyValue[0].uri
except:
continue
path = item.abshref(src)
ff = self.oeb.manifest.hrefs.get(urlnormalize(path), None)
if ff is None:
continue
raw = nraw = ff.data
if path not in processed:
processed.add(path)
try:
nraw = remove_embed_restriction(raw)
except:
continue
if nraw != raw:
ff.data = nraw
self.oeb.container.write(path, nraw)
def convert_text(self, oeb_book):
import json
from ebook_converter.ebooks.pdf.html_writer import convert
self.get_cover_data()
self.process_fonts()
if self.opts.pdf_use_document_margins and self.stored_page_margins:
for href, margins in iteritems(self.stored_page_margins):
item = oeb_book.manifest.hrefs.get(href)
if item is not None:
root = item.data
if hasattr(root, 'xpath') and margins:
root.set('data-calibre-pdf-output-page-margins', json.dumps(margins))
with TemporaryDirectory('_pdf_out') as oeb_dir:
from ebook_converter.customize.ui import plugin_for_output_format
oeb_dir = os.path.realpath(oeb_dir)
oeb_output = plugin_for_output_format('oeb')
oeb_output.convert(oeb_book, oeb_dir, self.input_plugin, self.opts, self.log)
opfpath = glob.glob(os.path.join(oeb_dir, '*.opf'))[0]
convert(
opfpath, self.opts, metadata=self.metadata, output_path=self.output_path,
log=self.log, cover_data=self.cover_data, report_progress=self.report_progress
)
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