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Do not modify anything other than the titlepage when processing covers in EPUB files.

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This speeds up book preparation by not requiring book wide link
replacement.
This commit is contained in:
Kovid Goyal 2019-10-22 08:52:13 +05:30
parent 75dd89722a
commit 29e20d8b59
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 39 additions and 28 deletions
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67
src/calibre/srv/render_book.py
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@ -31,7 +31,7 @@ from calibre.ebooks.oeb.base import (
from calibre.ebooks.oeb.iterator.book import extract_book
from calibre.ebooks.oeb.polish.container import Container as ContainerBase
from calibre.ebooks.oeb.polish.cover import (
find_cover_image, has_epub_cover, set_epub_cover
find_cover_image, find_cover_image_in_page, find_cover_page
)
from calibre.ebooks.oeb.polish.css import transform_inline_styles
from calibre.ebooks.oeb.polish.toc import from_xpaths, get_landmarks, get_toc
@ -238,7 +238,35 @@ class SimpleContainer(ContainerBase):
tweak_mode = True
def create_cover_page(container, input_fmt, allow_no_cover, book_metadata=None):
def find_epub_cover(container):
cover_image = find_cover_image(container)
marked_title_page = find_cover_page(container)
cover_image_in_first_page = None
first_page_name = next(container.spine_names)[0]
if not marked_title_page:
cover_image_in_first_page = find_cover_image_in_page(container, first_page_name)
has_epub_cover = cover_image or marked_title_page or cover_image_in_first_page
if not has_epub_cover:
return None, None
if marked_title_page and cover_image:
return marked_title_page, cover_image
if marked_title_page:
if cover_image:
return marked_title_page, cover_image
cover_image = find_cover_image_in_page(container, marked_title_page)
if cover_image:
return marked_title_page, cover_image
return None, None
if cover_image_in_first_page:
return first_page_name, cover_image_in_first_page
return None, None
def create_cover_page(container, input_fmt, is_comic, book_metadata=None):
templ = '''
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head><style>
@ -263,33 +291,16 @@ def create_cover_page(container, input_fmt, allow_no_cover, book_metadata=None):
return BLANK_JPEG
if input_fmt == 'epub':
def image_callback(cover_image, wrapped_image):
if cover_image:
image_callback.cover_data = container.raw_data(cover_image, decode=False)
if wrapped_image and not getattr(image_callback, 'cover_data', None):
image_callback.cover_data = container.raw_data(wrapped_image, decode=False)
def cover_path(action, data):
if action == 'write_image':
cdata = getattr(image_callback, 'cover_data', None) or generic_cover()
data.write(cdata)
if allow_no_cover and not has_epub_cover(container):
return None, None
raster_cover_name, titlepage_name = set_epub_cover(
container, cover_path, (lambda *a: None), options={'template':templ},
image_callback=image_callback)
raster_cover_name, titlepage_name = find_epub_cover(container)
if raster_cover_name and titlepage_name:
raw = templ % prepare_string_for_xml(container.name_to_href(raster_cover_name, titlepage_name), True)
with container.open(titlepage_name, 'wb') as f:
f.write(raw.encode('utf-8'))
else:
raster_cover_name = find_cover_image(container, strict=True)
if raster_cover_name is None:
if allow_no_cover:
return None, None
item = container.generate_item(name='cover.jpeg', id_prefix='cover')
raster_cover_name = container.href_to_name(item.get('href'), container.opf_name)
with container.open(raster_cover_name, 'wb') as dest:
dest.write(generic_cover())
if container.is_comic:
return None, None
if is_comic:
return raster_cover_name, None
item = container.generate_item(name='titlepage.html', id_prefix='titlepage')
titlepage_name = container.href_to_name(item.get('href'), container.opf_name)
@ -535,7 +546,7 @@ def process_book_files(names, container_dir, opfpath, virtualize_resources, link
def process_exploded_book(
book_fmt, opfpath, input_fmt, tdir, render_manager, log=None, book_hash=None, save_bookmark_data=False,
book_metadata=None, allow_no_cover=True, virtualize_resources=True
book_metadata=None, virtualize_resources=True
):
log = log or default_log
container = SimpleContainer(tdir, opfpath, log)
@ -555,7 +566,7 @@ def process_exploded_book(
name for name, mt in iteritems(container.mime_map) if
name == container.opf_name or mt == guess_type('a.ncx') or name.startswith('META-INF/') or
name == 'mimetype' or not container.has_name_and_is_not_empty(name)}
raster_cover_name, titlepage_name = create_cover_page(container, input_fmt.lower(), allow_no_cover, book_metadata)
raster_cover_name, titlepage_name = create_cover_page(container, input_fmt.lower(), is_comic, book_metadata)
toc = get_toc(container, verify_destinations=False).to_dict(count())
if not toc or not toc.get('children'):