touch-packages team mailing list archive

[Pat McGowan <pat.mcgowan@xxxxxxxxxxxxx>]

** Changed in: canonical-devices-system-image
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1460993

Title:
  Multiple thumbnail requests for a single image

Status in the base for Ubuntu mobile products:
  Fix Released
Status in Gallery App:
  In Progress
Status in gallery-app package in Ubuntu:
  In Progress

Bug description:
  I just took two short videos and four photos on the phone. When I look
  at the events page in the gallery app, I see thumbnails for the these
  just fine. I'm also tracing the requests that are made to the
  thumbnailer. When I tap on one of the photos, I see the following
  requests fired at the thumbnailer all at once (within one or two
  tenths of a second):

  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(216, 216)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(216, -1)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(231, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(256, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(291, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(341, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(402, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(477, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(558, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(657, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(768, 0)
  Create thumbnail for "/home/phablet/Pictures/com.ubuntu.camera/image20150602_073643136.jpg" at size QSize(768, 1222)

  This is horribly wasteful because the app retrieves the same image a
  dozen times. But, worse, we will cache thumbnailer in twelve different
  sizes for that same single image because we are being asked for a
  different size each time.

  Also note that requests with width or height < 0 are interpreted to
  mean "as large as possible". The second request above consequently
  causes the image to be cached in its full size (unless it's larger
  than 1920, in which case we limit it to 1920x1920 bounding box).

  Something seems definitely wrong here. The multiple requests are
  wasteful, and the different sizes mean that the cache is far less
  effective than it could be.

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