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[Florian Boucault <florian.boucault@xxxxxxxxxxxxx>]

** Changed in: camera-app
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1517260

Title:
  Two thumbnail requests for each image in photo roll view

Status in camera-app:
  Confirmed
Status in thumbnailer package in Ubuntu:
  Triaged

Bug description:
  I'm seeing two requests for thumbnails when scrolling in the photo
  roll view.

  thumbnailer-service: [23:45:47.191] "thumbnail: /home/phablet/Pictures/com.ubuntu.camera/image20151104_043132332.jpg (248,0): 0.027926 sec (MISS)"
  thumbnailer-service: [23:45:47.201] "thumbnail: /home/phablet/Pictures/com.ubuntu.camera/image20151104_043132332.jpg (248,248): 0.036288 sec (MISS)"
  thumbnailer-service: [23:45:47.608] "thumbnail: /home/phablet/Pictures/com.ubuntu.camera/image20151104_043130161.jpg (248,0): 0.025118 sec (MISS)"
  thumbnailer-service: [23:45:47.619] "thumbnail: /home/phablet/Pictures/com.ubuntu.camera/image20151104_043130161.jpg (248,248): 0.034762 sec (MISS)"

  Note that, for each image, one requests is for (248,0), followed by
  another request for (248,248).

  This is decidedly sub-optimal because it makes two round-trips to the
  thumbnailer for each image and causes the thumbnailer to cache two
  thumbnails. This reduces the effectiveness of the cache and wastes
  CPU.

  To reproduce, take around 30 photos. In a shell on the device, run

  thumbnailer-admin clear

  Run a

  tail -f ~/.cache/upstart/dbus.log

  Now start the camera app. Change to the photo roll view and slowly
  scroll down. As each new image comes into view, there are two requests
  sent to the thumbnailer for each image.

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