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Move convert_PIL_image_to_pixmap to the GUI thread

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Charles Haley 2024-01-26 20:35:44 +00:00
parent 3960e6a8d5
commit d6f5384b8a
1 changed files with 23 additions and 17 deletions
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36
src/calibre/gui2/library/alternate_views.py
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@ -1005,16 +1005,16 @@ class GridView(QListView):
def make_thumbnail(self, cover_tuple):
# Render the cover image data to the thumbnail size and correct format.
# Rendering isn't needed if the cover came from the cache and the cache
# is valid. Put a newly rendered image into the cache. Returns a
# QPixmap. This method is called on the cover thread.
# is valid. Put a newly rendered image into the cache. Returns the
# thumbnail as a PIL Image. This method is called on the cover thread.
cdata = cover_tuple.cdata
book_id = cover_tuple.book_id
tc = self.thumbnail_cache
thumb = None
# thumb = None
if cover_tuple.has_cover:
# The book has a cover. Render the cover data as needed to get the
# thumbnail that will be cached.
# cdata contains either the resized thumbnail, the full cover.jpg,
# or None if cover.jpg isn't valid
if cdata.getbbox() is None and cover_tuple.cache_valid:
# Something wrong with the cover data in the cache. Remove it
# from the cache and render it again.
@ -1040,13 +1040,14 @@ class GridView(QListView):
# The PIL thumbnail operation works in-place, changing
# the source image.
cdata.thumbnail((int(nwidth), int(nheight)))
thumb = cdata
# Put the new thumbnail into the cache.
try:
with BytesIO() as buf:
cdata.save(buf, format=CACHE_FORMAT)
# use getbuffer() instead of getvalue() to avoid a copy
tc.insert(book_id, cover_tuple.timestamp, buf.getbuffer())
thumb = convert_PIL_image_to_pixmap(cdata)
thumb = cdata
except Exception:
tc.invalidate((book_id,))
import traceback
@ -1055,22 +1056,27 @@ class GridView(QListView):
# The cover data isn't valid. Remove it from the cache
tc.invalidate((book_id,))
else:
# The data from the cover cache is valid. the QPixmap to pass to
# the GUI
thumb = convert_PIL_image_to_pixmap(cdata)
elif cover_tuple.cache_valid is not None:
# The data from the cover cache is valid and is already a thumb.
thumb = cdata
else:
# The book doesn't have a cover.
if cover_tuple.cache_valid is not None:
# Cover was removed, but it exists in cache. Remove it from the cache
tc.invalidate((book_id,))
# Return the thumbnail, which is either None or a QPixmap. This can
# result in putting None into the cache so re-rendering doesn't try
# again.
thumb = None
# Return the thumbnail, which is either None or a PIL Image. If not None
# the image will be converted to a QPixmap on the GUI thread. Putting
# None into the CoverCache ensures re-rendering won't try again.
return thumb
def re_render(self, book_id, thumb):
# This is called on the GUI thread when a cover thumbnail is not in the
# CoverCache. The parameter "thumb" is None if there is no cover or a
# QPixmap of the correctly scaled cover
# CoverCache. The parameter "thumb" is either None if there is no cover
# or a PIL Image of the thumbnail.
self.delegate.cover_cache.clear_staging()
if thumb is not None:
# Convert the image to a QPixmap
thumb = convert_PIL_image_to_pixmap(thumb)
self.delegate.cover_cache.set(book_id, thumb)
m = self.model()
try: