Zdrojový kód pro calibre.ebooks.oeb.polish.cover

# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
from __future__ import (unicode_literals, division, absolute_import,

__license__   = 'GPL v3'
__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
__docformat__ = 'restructuredtext en'

import shutil, re, os

from calibre.ebooks.oeb.base import OPF, OEB_DOCS, XPath, XLINK, xml2text
from calibre.ebooks.oeb.polish.replace import replace_links, get_recommended_folders
from calibre.utils.imghdr import identify
from polyglot.builtins import iteritems

def set_azw3_cover(container, cover_path, report, options=None):
    existing_image = options is not None and options.get('existing_image', False)
    name = None
    found = True
    for gi in container.opf_xpath('//opf:guide/opf:reference[@href and contains(@type, "cover")]'):
        href = gi.get('href')
        name = container.href_to_name(href, container.opf_name)
    if existing_image:
        name = cover_path
        found = False
        if name is None or not container.has_name(name):
            item = container.generate_item(name='cover.jpeg', id_prefix='cover')
            name = container.href_to_name(item.get('href'), container.opf_name)
            found = False
    href = container.name_to_href(name, container.opf_name)
    guide = container.opf_xpath('//opf:guide')[0]
    container.insert_into_xml(guide, guide.makeelement(
        OPF('reference'), href=href, type='cover'))
    if not existing_image:
        with lopen(cover_path, 'rb') as src, container.open(name, 'wb') as dest:
            shutil.copyfileobj(src, dest)
    report(_('Cover updated') if found else _('Cover inserted'))

def get_azw3_raster_cover_name(container):
    items = container.opf_xpath('//opf:guide/opf:reference[@href and contains(@type, "cover")]')
    if items:
        return container.href_to_name(items[0].get('href'))

def mark_as_cover_azw3(container, name):
    href = container.name_to_href(name, container.opf_name)
    found = False
    for item in container.opf_xpath('//opf:guide/opf:reference[@href and contains(@type, "cover")]'):
        item.set('href', href)
        found = True
    if not found:
        for guide in container.opf_xpath('//opf:guide'):
            container.insert_into_xml(guide, guide.makeelement(
                OPF('reference'), href=href, type='cover'))

def get_raster_cover_name(container):
    if container.book_type == 'azw3':
        return get_azw3_raster_cover_name(container)
    return find_cover_image(container, strict=True)

def get_cover_page_name(container):
    if container.book_type == 'azw3':
    return find_cover_page(container)

[dokumentace]def set_cover(container, cover_path, report=None, options=None): ''' Set the cover of the book to the image pointed to by cover_path. :param cover_path: Either the absolute path to an image file or the canonical name of an image in the book. When using an image in the book, you must also set options, see below. :param report: An optional callable that takes a single argument. It will be called with information about the tasks being processed. :param options: None or a dictionary that controls how the cover is set. The dictionary can have entries: **keep_aspect**: True or False (Preserve aspect ratio of covers in EPUB) **no_svg**: True or False (Use an SVG cover wrapper in the EPUB titlepage) **existing**: True or False (``cover_path`` refers to an existing image in the book) ''' report = report or (lambda x:x) if container.book_type == 'azw3': set_azw3_cover(container, cover_path, report, options=options) else: set_epub_cover(container, cover_path, report, options=options)
[dokumentace]def mark_as_cover(container, name): ''' Mark the specified image as the cover image. ''' if name not in container.mime_map: raise ValueError('Cannot mark %s as cover as it does not exist' % name) mt = container.mime_map[name] if not is_raster_image(mt): raise ValueError('Cannot mark %s as the cover image as it is not a raster image' % name) if container.book_type == 'azw3': mark_as_cover_azw3(container, name) else: mark_as_cover_epub(container, name)
############################################################################### # The delightful EPUB cover processing def is_raster_image(media_type): return media_type and media_type.lower() in { 'image/png', 'image/jpeg', 'image/jpg', 'image/gif'} COVER_TYPES = { 'coverimagestandard', 'other.ms-coverimage-standard', 'other.ms-titleimage-standard', 'other.ms-titleimage', 'other.ms-coverimage', 'other.ms-thumbimage-standard', 'other.ms-thumbimage', 'thumbimagestandard', 'cover'} def find_cover_image2(container, strict=False): manifest_id_map = container.manifest_id_map mm = container.mime_map for meta in container.opf_xpath('//opf:meta[@name="cover" and @content]'): item_id = meta.get('content') name = manifest_id_map.get(item_id, None) media_type = mm.get(name, None) if is_raster_image(media_type): return name # First look for a guide item with type == 'cover' guide_type_map = container.guide_type_map for ref_type, name in iteritems(guide_type_map): if ref_type.lower() == 'cover' and is_raster_image(mm.get(name, None)): return name if strict: return # Find the largest image from all possible guide cover items largest_cover = (None, 0) for ref_type, name in iteritems(guide_type_map): if ref_type.lower() in COVER_TYPES and is_raster_image(mm.get(name, None)): path = container.name_path_map.get(name, None) if path: sz = os.path.getsize(path) if sz > largest_cover[1]: largest_cover = (name, sz) if largest_cover[0]: return largest_cover[0] def find_cover_image3(container): for name in container.manifest_items_with_property('cover-image'): return name manifest_id_map = container.manifest_id_map mm = container.mime_map for meta in container.opf_xpath('//opf:meta[@name="cover" and @content]'): item_id = meta.get('content') name = manifest_id_map.get(item_id, None) media_type = mm.get(name, None) if is_raster_image(media_type): return name def find_cover_image(container, strict=False): 'Find a raster image marked as a cover in the OPF' ver = container.opf_version_parsed if ver.major < 3: return find_cover_image2(container, strict=strict) else: return find_cover_image3(container) def get_guides(container): guides = container.opf_xpath('//opf:guide') if not guides: container.insert_into_xml(container.opf, container.opf.makeelement( OPF('guide'))) guides = container.opf_xpath('//opf:guide') return guides def mark_as_cover_epub(container, name): mmap = {v:k for k, v in iteritems(container.manifest_id_map)} if name not in mmap: raise ValueError('Cannot mark %s as cover as it is not in manifest' % name) mid = mmap[name] ver = container.opf_version_parsed # Remove all entries from the opf that identify a raster image as cover for meta in container.opf_xpath('//opf:meta[@name="cover" and @content]'): container.remove_from_xml(meta) for ref in container.opf_xpath('//opf:guide/opf:reference[@href and @type]'): if ref.get('type').lower() not in COVER_TYPES: continue rname = container.href_to_name(ref.get('href'), container.opf_name) mt = container.mime_map.get(rname, None) if is_raster_image(mt): container.remove_from_xml(ref) if ver.major < 3: # Add reference to image in <metadata> for metadata in container.opf_xpath('//opf:metadata'): m = metadata.makeelement(OPF('meta'), name='cover', content=mid) container.insert_into_xml(metadata, m) # If no entry for cover exists in guide, insert one that points to this # image if not container.opf_xpath('//opf:guide/opf:reference[@type="cover"]'): for guide in get_guides(container): container.insert_into_xml(guide, guide.makeelement( OPF('reference'), type='cover', href=container.name_to_href(name, container.opf_name))) else: container.apply_unique_properties(name, 'cover-image') container.dirty(container.opf_name)
[dokumentace]def mark_as_titlepage(container, name, move_to_start=True): ''' Mark the specified HTML file as the titlepage of the EPUB. :param move_to_start: If True the HTML file is moved to the start of the spine ''' ver = container.opf_version_parsed if move_to_start: for item, q, linear in container.spine_iter: if name == q: break if not linear: item.set('linear', 'yes') if item.getparent().index(item) > 0: container.insert_into_xml(item.getparent(), item, 0) if ver.major < 3: for ref in container.opf_xpath('//opf:guide/opf:reference[@type="cover"]'): ref.getparent().remove(ref) for guide in get_guides(container): container.insert_into_xml(guide, guide.makeelement( OPF('reference'), type='cover', href=container.name_to_href(name, container.opf_name))) else: container.apply_unique_properties(name, 'calibre:title-page') container.dirty(container.opf_name)
def find_cover_page(container): 'Find a document marked as a cover in the OPF' ver = container.opf_version_parsed mm = container.mime_map if ver.major < 3: guide_type_map = container.guide_type_map for ref_type, name in iteritems(guide_type_map): if ref_type.lower() == 'cover' and mm.get(name, '').lower() in OEB_DOCS: return name else: for name in container.manifest_items_with_property('calibre:title-page'): return name from calibre.ebooks.oeb.polish.toc import get_landmarks for landmark in get_landmarks(container): if landmark['type'] == 'cover' and mm.get(landmark['dest'], '').lower() in OEB_DOCS: return landmark['dest'] def fix_conversion_titlepage_links_in_nav(container): from calibre.ebooks.oeb.polish.toc import find_existing_nav_toc cover_page_name = find_cover_page(container) if not cover_page_name: return nav_page_name = find_existing_nav_toc(container) if not nav_page_name: return for elem in container.parsed(nav_page_name).xpath('//*[@data-calibre-removed-titlepage]'): elem.attrib.pop('data-calibre-removed-titlepage') elem.set('href', container.name_to_href(cover_page_name, nav_page_name)) container.dirty(nav_page_name) def find_cover_image_in_page(container, cover_page): root = container.parsed(cover_page) body = XPath('//h:body')(root) if len(body) != 1: return body = body[0] images = [] for img in XPath('descendant::h:img[@src]|descendant::svg:svg/descendant::svg:image')(body): href = img.get('src') or img.get(XLINK('href')) if href: name = container.href_to_name(href, base=cover_page) images.append(name) text = re.sub(r'\s+', '', xml2text(body)) if text or len(images) > 1: # Document has more content than a single image return if images: return images[0] def clean_opf(container): 'Remove all references to covers from the OPF' manifest_id_map = container.manifest_id_map for meta in container.opf_xpath('//opf:meta[@name="cover" and @content]'): name = manifest_id_map.get(meta.get('content', None), None) container.remove_from_xml(meta) if name and name in container.name_path_map: yield name gtm = container.guide_type_map for ref in container.opf_xpath('//opf:guide/opf:reference[@type]'): typ = ref.get('type', '') if typ.lower() in COVER_TYPES: container.remove_from_xml(ref) name = gtm.get(typ, None) if name and name in container.name_path_map: yield name ver = container.opf_version_parsed if ver.major > 2: removed_names = container.apply_unique_properties(None, 'cover-image', 'calibre:title-page')[0] for name in removed_names: yield name container.dirty(container.opf_name) def create_epub_cover(container, cover_path, existing_image, options=None): from calibre.ebooks.conversion.config import load_defaults from calibre.ebooks.oeb.transforms.cover import CoverManager try: ext = cover_path.rpartition('.')[-1].lower() except Exception: ext = 'jpeg' cname, tname = 'cover.' + ext, 'titlepage.xhtml' recommended_folders = get_recommended_folders(container, (cname, tname)) if existing_image: raster_cover = existing_image manifest_id = {v:k for k, v in iteritems(container.manifest_id_map)}[existing_image] raster_cover_item = container.opf_xpath('//opf:manifest/*[@id="%s"]' % manifest_id)[0] else: folder = recommended_folders[cname] if folder: cname = folder + '/' + cname raster_cover_item = container.generate_item(cname, id_prefix='cover') raster_cover = container.href_to_name(raster_cover_item.get('href'), container.opf_name) with container.open(raster_cover, 'wb') as dest: if callable(cover_path): cover_path('write_image', dest) else: with lopen(cover_path, 'rb') as src: shutil.copyfileobj(src, dest) if options is None: opts = load_defaults('epub_output') keep_aspect = opts.get('preserve_cover_aspect_ratio', False) no_svg = opts.get('no_svg_cover', False) else: keep_aspect = options.get('keep_aspect', False) no_svg = options.get('no_svg', False) if no_svg: style = 'style="height: 100%%"' templ = CoverManager.NONSVG_TEMPLATE.replace('__style__', style) has_svg = False else: if callable(cover_path): templ = (options or {}).get('template', CoverManager.SVG_TEMPLATE) has_svg = 'xlink:href' in templ else: width, height = 600, 800 has_svg = True try: if existing_image: width, height = identify(container.raw_data(existing_image, decode=False))[1:] else: with lopen(cover_path, 'rb') as csrc: width, height = identify(csrc)[1:] except: container.log.exception("Failed to get width and height of cover") ar = 'xMidYMid meet' if keep_aspect else 'none' templ = CoverManager.SVG_TEMPLATE.replace('__ar__', ar) templ = templ.replace('__viewbox__', '0 0 %d %d'%(width, height)) templ = templ.replace('__width__', str(width)) templ = templ.replace('__height__', str(height)) folder = recommended_folders[tname] if folder: tname = folder + '/' + tname titlepage_item = container.generate_item(tname, id_prefix='titlepage') titlepage = container.href_to_name(titlepage_item.get('href'), container.opf_name) raw = templ%container.name_to_href(raster_cover, titlepage).encode('utf-8') with container.open(titlepage, 'wb') as f: f.write(raw) # We have to make sure the raster cover item has id="cover" for the moron # that wrote the Nook firmware if raster_cover_item.get('id') != 'cover': from calibre.ebooks.oeb.base import uuid_id newid = uuid_id() for item in container.opf_xpath('//*[@id="cover"]'): item.set('id', newid) for item in container.opf_xpath('//*[@idref="cover"]'): item.set('idref', newid) raster_cover_item.set('id', 'cover') spine = container.opf_xpath('//opf:spine')[0] ref = spine.makeelement(OPF('itemref'), idref=titlepage_item.get('id')) container.insert_into_xml(spine, ref, index=0) ver = container.opf_version_parsed if ver.major < 3: guide = container.opf_get_or_create('guide') container.insert_into_xml(guide, guide.makeelement( OPF('reference'), type='cover', title=_('Cover'), href=container.name_to_href(titlepage, base=container.opf_name))) metadata = container.opf_get_or_create('metadata') meta = metadata.makeelement(OPF('meta'), name='cover') meta.set('content', raster_cover_item.get('id')) container.insert_into_xml(metadata, meta) else: container.apply_unique_properties(raster_cover, 'cover-image') container.apply_unique_properties(titlepage, 'calibre:title-page') if has_svg: container.add_properties(titlepage, 'svg') return raster_cover, titlepage def remove_cover_image_in_page(container, page, cover_images): for img in container.parsed(page).xpath('//*[local-name()="img" and @src]'): href = img.get('src') name = container.href_to_name(href, page) if name in cover_images: img.getparent().remove(img) break def set_epub_cover(container, cover_path, report, options=None): existing_image = options is not None and options.get('existing_image', False) if existing_image: existing_image = cover_path cover_image = find_cover_image(container) cover_page = find_cover_page(container) wrapped_image = extra_cover_page = None updated = False log = container.log possible_removals = set(clean_opf(container)) possible_removals # TODO: Handle possible_removals and also iterate over links in the removed # pages and handle possibly removing stylesheets referred to by them. spine_items = tuple(container.spine_items) if cover_page is None and spine_items: # Check if the first item in the spine is a simple cover wrapper candidate = container.abspath_to_name(spine_items[0]) if find_cover_image_in_page(container, candidate) is not None: cover_page = candidate if cover_page is not None: log('Found existing cover page') wrapped_image = find_cover_image_in_page(container, cover_page) if len(spine_items) > 1: # Look for an extra cover page c = container.abspath_to_name(spine_items[1]) if c != cover_page: candidate = find_cover_image_in_page(container, c) if candidate and candidate in {wrapped_image, cover_image}: log('Found an extra cover page that is a simple wrapper, removing it') # This page has only a single image and that image is the # cover image, remove it. container.remove_item(c) extra_cover_page = c spine_items = spine_items[:1] + spine_items[2:] elif candidate is None: # Remove the cover image if it is the first image in this # page remove_cover_image_in_page(container, c, {wrapped_image, cover_image}) if wrapped_image is not None: # The cover page is a simple wrapper around a single cover image, # we can remove it safely. log('Existing cover page is a simple wrapper, removing it') container.remove_item(cover_page) if wrapped_image != existing_image: container.remove_item(wrapped_image) updated = True if cover_image and cover_image != wrapped_image: # Remove the old cover image if cover_image != existing_image: container.remove_item(cover_image) # Insert the new cover raster_cover, titlepage = create_epub_cover(container, cover_path, existing_image, options=options) report(_('Cover updated') if updated else _('Cover inserted')) # Replace links to the old cover image/cover page link_sub = {s:d for s, d in iteritems({ cover_page:titlepage, wrapped_image:raster_cover, cover_image:raster_cover, extra_cover_page:titlepage}) if s is not None and s != d} if link_sub: replace_links(container, link_sub, frag_map=lambda x, y:None) return raster_cover, titlepage