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[ui] ImageGallery: faster thumbnail dispatch using caller ID

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mugulmd 2023-01-16 06:21:48 -08:00
parent 8551135514
commit 80174e22af
3 changed files with 19 additions and 15 deletions
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20
meshroom/ui/components/thumbnail.py
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@ -49,8 +49,10 @@ class ThumbnailCache(QObject):
maxThumbnailsOnDisk = 100000
# Signal to notify listeners that a thumbnail was created and written on disk
# This signal has one argument: the url of the image that the thumbnail is associated to
thumbnailCreated = Signal(QUrl)
# This signal has two argument:
# - the url of the image that the thumbnail is associated to
# - an identifier for the caller, e.g. the component that sent the request (useful for faster dispatch in QML)
thumbnailCreated = Signal(QUrl, int)
# Thread pool for running createThumbnail asynchronously on a fixed number of worker threads
pool = ThreadPool(processes=3)
@ -93,15 +95,16 @@ class ThumbnailCache(QObject):
path = os.path.join(ThumbnailCache.thumbnailDir, f'{digest}.jpg')
return path
@Slot(QUrl, result=QUrl)
def thumbnail(self, imgSource):
@Slot(QUrl, int, result=QUrl)
def thumbnail(self, imgSource, callerID):
"""Retrieve the filepath of the thumbnail corresponding to a given image.
If the thumbnail does not exist on disk, it will be created asynchronously.
When this is done, the createdThumbnail signal is emitted.
When this is done, the thumbnailCreated signal is emitted.
Args:
imgSource (QUrl): location of the input image
callerID (int): identifier for the object that requested the thumbnail
Returns:
QUrl: location of the corresponding thumbnail if it exists, otherwise None
@ -121,14 +124,15 @@ class ThumbnailCache(QObject):
# Thumbnail does not exist
# create it in a worker thread to avoid UI freeze
ThumbnailCache.pool.apply_async(self.createThumbnail, args=(imgSource,))
ThumbnailCache.pool.apply_async(self.createThumbnail, args=(imgSource,callerID,))
return None
def createThumbnail(self, imgSource):
def createThumbnail(self, imgSource, callerID):
"""Load an image, resize it to thumbnail dimensions and save the result in the cache directory.
Args:
imgSource (QUrl): location of the input image
callerID (int): identifier for the object that requested the thumbnail
"""
imgPath = imgSource.toLocalFile()
path = ThumbnailCache.thumbnailPath(imgPath)
@ -155,7 +159,7 @@ class ThumbnailCache(QObject):
logging.error(f'[ThumbnailCache] Error when writing thumbnail: {writer.errorString()}')
# Notify listeners
self.thumbnailCreated.emit(imgSource)
self.thumbnailCreated.emit(imgSource, callerID)
@staticmethod
def clean():