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EPUB metadata: Extract the cover image from the html it is embededd in if possible, instead of rendering the html. Removes the white margins on covers and speeds up cover extraction

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This commit is contained in:
Kovid Goyal 2010-02-07 12:49:54 -07:00
parent 6a24c74e50
commit a1365513dd
1 changed files with 18 additions and 0 deletions
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18
src/calibre/ebooks/__init__.py
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@ -70,6 +70,19 @@ def extract_cover_from_embedded_svg(html, base, log):
if href and os.access(path, os.R_OK):
return open(path, 'rb').read()
def extract_calibre_cover(raw, base, log):
from calibre.ebooks.BeautifulSoup import BeautifulSoup
soup = BeautifulSoup(raw)
matches = soup.find(name=['h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'p', 'span',
'font', 'br'])
images = soup.findAll('img')
if matches is None and len(images) == 1 and \
images[0].get('alt', '')=='cover':
img = images[0]
img = os.path.join(base, *img['src'].split('/'))
if os.path.exists(img):
return open(img, 'rb').read()
def render_html_svg_workaround(path_to_html, log, width=590, height=750):
from calibre.ebooks.oeb.base import SVG_NS
raw = open(path_to_html, 'rb').read()
@ -80,6 +93,11 @@ def render_html_svg_workaround(path_to_html, log, width=590, height=750):
os.path.dirname(path_to_html), log)
except:
pass
if data is None:
try:
data = extract_calibre_cover(raw, os.path.dirname(path_to_html), log)
except:
pass
if data is None:
renderer = render_html(path_to_html, width, height)
data = getattr(renderer, 'data', None)