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Dont use WebKit to render HTML for EPUB covers
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Kovid Goyal
parent
27798beaf6
commit
6f86896da8
@ -8,8 +8,8 @@ Code for the conversion of ebook formats and the reading of metadata
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from various formats.
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'''
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import traceback, os, re, numbers
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from calibre import CurrentDir, prints
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import os, re, numbers, sys
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from calibre import prints
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from calibre.ebooks.chardet import xml_to_unicode
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from polyglot.builtins import unicode_type
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@ -41,40 +41,6 @@ BOOK_EXTENSIONS = ['lrf', 'rar', 'zip', 'rtf', 'lit', 'txt', 'txtz', 'text', 'ht
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'textile', 'markdown', 'ibook', 'ibooks', 'iba', 'azw3', 'ps', 'kepub', 'kfx']
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class HTMLRenderer(object):
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def __init__(self, page, loop):
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self.page, self.loop = page, loop
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self.data = ''
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self.exception = self.tb = None
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def __call__(self, ok):
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from PyQt5.Qt import QImage, QPainter, QByteArray, QBuffer
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try:
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if not ok:
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raise RuntimeError('Rendering of HTML failed.')
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de = self.page.mainFrame().documentElement()
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pe = de.findFirst('parsererror')
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if not pe.isNull():
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raise ParserError(pe.toPlainText())
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image = QImage(self.page.viewportSize(), QImage.Format_ARGB32)
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image.setDotsPerMeterX(96*(100/2.54))
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image.setDotsPerMeterY(96*(100/2.54))
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painter = QPainter(image)
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self.page.mainFrame().render(painter)
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painter.end()
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ba = QByteArray()
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buf = QBuffer(ba)
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buf.open(QBuffer.WriteOnly)
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image.save(buf, 'JPEG')
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self.data = ba.data()
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except Exception as e:
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self.exception = e
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self.traceback = traceback.format_exc()
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finally:
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self.loop.exit(0)
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def return_raster_image(path):
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from calibre.utils.imghdr import what
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if os.access(path, os.R_OK):
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@ -145,63 +111,33 @@ def render_html_svg_workaround(path_to_html, log, width=590, height=750):
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pass
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if data is None:
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from calibre.gui2 import is_ok_to_use_qt
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if is_ok_to_use_qt():
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data = render_html_data(path_to_html, width, height)
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else:
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from calibre.utils.ipc.simple_worker import fork_job, WorkerError
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try:
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result = fork_job('calibre.ebooks',
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'render_html_data',
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(path_to_html, width, height),
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no_output=True)
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data = result['result']
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except WorkerError as err:
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prints(err.orig_tb)
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except:
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traceback.print_exc()
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data = render_html_data(path_to_html, width, height)
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return data
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def render_html_data(path_to_html, width, height):
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renderer = render_html(path_to_html, width, height)
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return getattr(renderer, 'data', None)
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from calibre.ptempfile import TemporaryDirectory
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from calibre.utils.ipc.simple_worker import fork_job, WorkerError
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def report_error(text=''):
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prints('Failed to render', path_to_html, 'with errors:', file=sys.stderr)
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if text:
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prints(text, file=sys.stderr)
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if result['stdout_stderr']:
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with open(result['stdout_stderr'], 'rb') as f:
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prints(f.read(), file=sys.stderr)
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def render_html(path_to_html, width=590, height=750, as_xhtml=True):
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from PyQt5.QtWebKitWidgets import QWebPage
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from PyQt5.Qt import QEventLoop, QPalette, Qt, QUrl, QSize
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from calibre.gui2 import is_ok_to_use_qt, secure_web_page
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if not is_ok_to_use_qt():
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return None
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path_to_html = os.path.abspath(path_to_html)
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with CurrentDir(os.path.dirname(path_to_html)):
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page = QWebPage()
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settings = page.settings()
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secure_web_page(settings)
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pal = page.palette()
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pal.setBrush(QPalette.Background, Qt.white)
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page.setPalette(pal)
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page.setViewportSize(QSize(width, height))
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page.mainFrame().setScrollBarPolicy(Qt.Vertical, Qt.ScrollBarAlwaysOff)
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page.mainFrame().setScrollBarPolicy(Qt.Horizontal, Qt.ScrollBarAlwaysOff)
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loop = QEventLoop()
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renderer = HTMLRenderer(page, loop)
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page.loadFinished.connect(renderer, type=Qt.QueuedConnection)
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if as_xhtml:
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page.mainFrame().setContent(open(path_to_html, 'rb').read(),
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'application/xhtml+xml', QUrl.fromLocalFile(path_to_html))
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with TemporaryDirectory('-render-html') as tdir:
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try:
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result = fork_job('calibre.ebooks.render_html', 'main', args=(path_to_html, tdir, 'jpeg'))
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except WorkerError as e:
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report_error(e.orig_tb)
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else:
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page.mainFrame().load(QUrl.fromLocalFile(path_to_html))
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loop.exec_()
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renderer.loop = renderer.page = None
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page.loadFinished.disconnect()
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del page
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del loop
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if isinstance(renderer.exception, ParserError) and as_xhtml:
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return render_html(path_to_html, width=width, height=height,
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as_xhtml=False)
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return renderer
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if result['result']:
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with open(os.path.join(tdir, 'rendered.jpeg'), 'rb') as f:
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return f.read()
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else:
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report_error()
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def check_ebook_format(stream, current_guess):
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@ -10,13 +10,11 @@ __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
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import io
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import os
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import posixpath
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import re
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from contextlib import closing
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from lxml import etree
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from calibre import CurrentDir, walk
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from calibre.constants import isosx
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from calibre import CurrentDir
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from calibre.ebooks.metadata.opf import (
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get_metadata as get_metadata_from_opf, set_metadata as set_metadata_opf
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)
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@ -198,39 +196,6 @@ def render_cover(cpage, zf, reader=None):
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cpage = os.path.join(tdir, cpage)
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if not os.path.exists(cpage):
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return
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if isosx:
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# On OS X trying to render a HTML cover which uses embedded
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# fonts more than once in the same process causes a crash in Qt
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# so be safe and remove the fonts as well as any @font-face
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# rules
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for f in walk('.'):
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if os.path.splitext(f)[1].lower() in ('.ttf', '.otf'):
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os.remove(f)
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ffpat = re.compile(br'@font-face.*?{.*?}',
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re.DOTALL|re.IGNORECASE)
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with lopen(cpage, 'r+b') as f:
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raw = f.read()
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f.truncate(0)
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f.seek(0)
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raw = ffpat.sub(b'', raw)
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f.write(raw)
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from calibre.ebooks.chardet import xml_to_unicode
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raw = xml_to_unicode(raw,
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strip_encoding_pats=True, resolve_entities=True)[0]
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from lxml import html
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for link in html.fromstring(raw).xpath('//link'):
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href = link.get('href', '')
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if href:
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path = os.path.join(os.path.dirname(cpage), href)
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if os.path.exists(path):
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with lopen(path, 'r+b') as f:
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raw = f.read()
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f.truncate(0)
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f.seek(0)
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raw = ffpat.sub(b'', raw)
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f.write(raw)
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return render_html_svg_workaround(cpage, default_log)
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@ -82,7 +82,7 @@ def read_info(outputdir, get_cover):
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return ans
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def page_images(pdfpath, outputdir, first=1, last=1):
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def page_images(pdfpath, outputdir='.', first=1, last=1, image_format='jpeg', prefix='page-images'):
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pdftoppm = get_tools()[1]
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outputdir = os.path.abspath(outputdir)
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args = {}
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@ -90,9 +90,10 @@ def page_images(pdfpath, outputdir, first=1, last=1):
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import win32process as w
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args['creationflags'] = w.HIGH_PRIORITY_CLASS | w.CREATE_NO_WINDOW
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try:
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subprocess.check_call([pdftoppm, '-cropbox', '-jpeg', '-f', unicode_type(first),
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'-l', unicode_type(last), pdfpath,
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os.path.join(outputdir, 'page-images')], **args)
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subprocess.check_call([
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pdftoppm, '-cropbox', '-' + image_format, '-f', unicode_type(first),
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'-l', unicode_type(last), pdfpath, os.path.join(outputdir, prefix)
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], **args)
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except subprocess.CalledProcessError as e:
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raise ValueError('Failed to render PDF, pdftoppm errorcode: %s'%e.returncode)
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58
src/calibre/ebooks/render_html.py
Normal file
58
src/calibre/ebooks/render_html.py
Normal file
@ -0,0 +1,58 @@
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#!/usr/bin/env python2
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# vim:fileencoding=utf-8
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# License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
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from __future__ import absolute_import, division, print_function, unicode_literals
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import os
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import sys
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from PyQt5.Qt import QApplication, QMarginsF, QPageLayout, QPageSize, Qt, QUrl
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from PyQt5.QtWebEngineWidgets import QWebEnginePage
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from calibre.ebooks.metadata.pdf import page_images
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from calibre.gui2 import must_use_qt
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from calibre.gui2.webengine import secure_webengine
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class Render(QWebEnginePage):
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def __init__(self):
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QWebEnginePage.__init__(self)
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secure_webengine(self)
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self.loadFinished.connect(self.load_finished, type=Qt.QueuedConnection)
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self.pdfPrintingFinished.connect(self.print_finished)
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def load_finished(self, ok):
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if ok:
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self.start_print()
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else:
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QApplication.instance().exit(1)
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def start_print(self):
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margins = QMarginsF(0, 0, 0, 0)
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page_layout = QPageLayout(QPageSize(QPageSize.A4), QPageLayout.Portrait, margins)
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self.printToPdf('rendered.pdf', page_layout)
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def print_finished(self, path, ok):
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QApplication.instance().exit(0 if ok else 2)
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def main(path_to_html, tdir, image_format='jpeg'):
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if image_format not in ('jpeg', 'png'):
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raise ValueError('Image format must be either jpeg or png')
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must_use_qt()
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path_to_html = os.path.abspath(path_to_html)
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os.chdir(tdir)
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renderer = Render()
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renderer.load(QUrl.fromLocalFile(path_to_html))
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ret = QApplication.instance().exec_()
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if ret == 0:
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page_images('rendered.pdf', image_format=image_format)
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ext = {'jpeg': 'jpg'}.get(image_format, image_format)
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os.rename('page-images-1.' + ext, 'rendered.' + image_format)
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return ret == 0
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if __name__ == '__main__':
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main(sys.argv[-1], '.')
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@ -23,6 +23,8 @@ def secure_webengine(view_or_page_or_settings, for_viewer=False):
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if not for_viewer:
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a(s.JavascriptEnabled, False)
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s.setUnknownUrlSchemePolicy(s.DisallowUnknownUrlSchemes)
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if hasattr(view_or_page_or_settings, 'setAudioMuted'):
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view_or_page_or_settings.setAudioMuted(True)
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a(s.JavascriptCanOpenWindows, False)
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a(s.JavascriptCanAccessClipboard, False)
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# ensure javascript cannot read from local files
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