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LRF Output: Disable the table as image option
Implementing it using WebEngine is too painful and LRF is a useless format anyway.
This commit is contained in:
Kovid Goyal
parent
6f86896da8
commit
a6576f0eff
@ -117,8 +117,7 @@ class LRFOutput(OutputFormatPlugin):
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),
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OptionRecommendation(name='render_tables_as_images',
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recommended_value=False,
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help=_('Render tables in the HTML as images (useful if the '
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'document has large or complex tables)')
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help=_('This option has no effect')
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),
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OptionRecommendation(name='text_size_multiplier_for_rendered_tables',
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recommended_value=1.0,
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@ -1727,44 +1727,18 @@ class HTMLConverter(object):
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self.previous_text = ' '
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self.process_children(tag, tag_css, tag_pseudo_css)
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elif tagname == 'table' and not self.ignore_tables and not self.in_table:
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if self.render_tables_as_images:
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print('Rendering table...')
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from calibre.ebooks.lrf.html.table_as_image import render_table
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pheight = int(self.current_page.pageStyle.attrs['textheight'])
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pwidth = int(self.current_page.pageStyle.attrs['textwidth'])
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images = render_table(self.soup, tag, tag_css,
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os.path.dirname(self.target_prefix),
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pwidth, pheight, self.profile.dpi,
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self.text_size_multiplier_for_rendered_tables)
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for path, width, height in images:
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stream = ImageStream(path, encoding='PNG')
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im = Image(stream, x0=0, y0=0, x1=width, y1=height,
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xsize=width, ysize=height)
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pb = self.current_block
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self.end_current_para()
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self.process_alignment(tag_css)
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self.current_para.append(Plot(im, xsize=width*720./self.profile.dpi,
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ysize=height*720./self.profile.dpi))
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self.current_block.append(self.current_para)
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self.current_page.append(self.current_block)
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self.current_block = self.book.create_text_block(
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textStyle=pb.textStyle,
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blockStyle=pb.blockStyle)
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self.current_para = Paragraph()
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else:
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tag_css = self.tag_css(tag)[0] # Table should not inherit CSS
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try:
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self.process_table(tag, tag_css)
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except Exception as err:
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self.log.warning(_('An error occurred while processing a table: %s. Ignoring table markup.')%repr(err))
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self.log.exception('')
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self.log.debug(_('Bad table:\n%s')%unicode_type(tag)[:300])
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self.in_table = False
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self.process_children(tag, tag_css, tag_pseudo_css)
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finally:
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if self.minimize_memory_usage:
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tag.extract()
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tag_css = self.tag_css(tag)[0] # Table should not inherit CSS
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try:
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self.process_table(tag, tag_css)
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except Exception as err:
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self.log.warning(_('An error occurred while processing a table: %s. Ignoring table markup.')%repr(err))
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self.log.exception('')
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self.log.debug(_('Bad table:\n%s')%unicode_type(tag)[:300])
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self.in_table = False
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self.process_children(tag, tag_css, tag_pseudo_css)
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finally:
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if self.minimize_memory_usage:
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tag.extract()
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else:
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self.process_children(tag, tag_css, tag_pseudo_css)
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finally:
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@ -1,102 +0,0 @@
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#!/usr/bin/env python2
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from __future__ import absolute_import, division, print_function, unicode_literals
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__license__ = 'GPL v3'
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__copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
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__docformat__ = 'restructuredtext en'
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'''
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Render HTML tables as images.
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'''
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import os, tempfile, atexit, shutil
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from PyQt5.Qt import QUrl, QApplication, QSize, QEventLoop, \
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QPainter, QImage, QObject, Qt
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from PyQt5.QtWebKitWidgets import QWebPage
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from polyglot.builtins import unicode_type
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class HTMLTableRenderer(QObject):
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def __init__(self, html, base_dir, width, height, dpi, factor):
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'''
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`width, height`: page width and height in pixels
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`base_dir`: The directory in which the HTML file that contains the table resides
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'''
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from calibre.gui2 import secure_web_page
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QObject.__init__(self)
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self.app = None
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self.width, self.height, self.dpi = width, height, dpi
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self.base_dir = base_dir
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self.images = []
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self.tdir = tempfile.mkdtemp(prefix='calibre_render_table')
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self.loop = QEventLoop()
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self.page = QWebPage()
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secure_web_page(self.page.settings())
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self.page.loadFinished.connect(self.render_html)
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self.page.mainFrame().setTextSizeMultiplier(factor)
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self.page.mainFrame().setHtml(html,
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QUrl('file:'+os.path.abspath(self.base_dir)))
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def render_html(self, ok):
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try:
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if not ok:
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return
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cwidth, cheight = self.page.mainFrame().contentsSize().width(), self.page.mainFrame().contentsSize().height()
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self.page.setViewportSize(QSize(cwidth, cheight))
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factor = float(self.width)/cwidth if cwidth > self.width else 1
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cutoff_height = int(self.height/factor)-3
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image = QImage(self.page.viewportSize(), QImage.Format_ARGB32)
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image.setDotsPerMeterX(self.dpi*(100/2.54))
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image.setDotsPerMeterY(self.dpi*(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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cheight = image.height()
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cwidth = image.width()
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pos = 0
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while pos < cheight:
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img = image.copy(0, pos, cwidth, min(cheight-pos, cutoff_height))
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pos += cutoff_height-20
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if cwidth > self.width:
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img = img.scaledToWidth(self.width, Qt.SmoothTransform)
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f = os.path.join(self.tdir, '%d.png'%pos)
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img.save(f)
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self.images.append((f, img.width(), img.height()))
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finally:
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QApplication.quit()
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def render_table(soup, table, css, base_dir, width, height, dpi, factor=1.0):
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head = ''
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for e in soup.findAll(['link', 'style']):
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head += unicode_type(e)+'\n\n'
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style = ''
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for key, val in css.items():
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style += key + ':%s;'%val
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html = '''\
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<html>
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<head>
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%s
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</head>
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<body style="width: %dpx; background: white">
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<style type="text/css">
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table {%s}
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</style>
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%s
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</body>
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</html>
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'''%(head, width-10, style, unicode_type(table))
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images, tdir = do_render(html, base_dir, width, height, dpi, factor)
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atexit.register(shutil.rmtree, tdir)
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return images
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def do_render(html, base_dir, width, height, dpi, factor):
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from calibre.gui2 import is_ok_to_use_qt
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if not is_ok_to_use_qt():
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raise Exception('Not OK to use Qt')
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tr = HTMLTableRenderer(html, base_dir, width, height, dpi, factor)
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tr.loop.exec_()
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return tr.images, tr.tdir
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