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Speedup loading of QImage from book cover file

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Kovid Goyal 2022-06-09 14:36:34 +05:30
parent 57612b4536
commit c428c6bbc0
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 9 additions and 6 deletions
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15
src/calibre/db/cache.py
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@ -891,7 +891,7 @@ class Cache:
@api
def cover(self, book_id,
as_file=False, as_image=False, as_path=False):
as_file=False, as_image=False, as_path=False, as_pixmap=False):
'''
Return the cover image or None. By default, returns the cover as a
bytestring.
@ -902,6 +902,7 @@ class Cache:
:param as_file: If True return the image as an open file object (a SpooledTemporaryFile)
:param as_image: If True return the image as a QImage object
:param as_pixmap: If True return the image as a QPixmap object
:param as_path: If True return the image as a path pointing to a
temporary file
'''
@ -916,16 +917,18 @@ class Cache:
if not self.copy_cover_to(book_id, pt):
return
ret = pt.name
elif as_pixmap or as_image:
from qt.core import QPixmap, QImage
ret = QImage() if as_image else QPixmap()
with self.safe_read_lock:
path = self._format_abspath(book_id, '__COVER_INTERNAL__')
if path:
ret.load(path)
else:
buf = BytesIO()
if not self.copy_cover_to(book_id, buf):
return
ret = buf.getvalue()
if as_image:
from qt.core import QImage
i = QImage()
i.loadFromData(ret)
ret = i
return ret
@read_api