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[John McAleely <1407640@xxxxxxxxxxxxxxxxxx>]

** Also affects: canonical-devices-system-image
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1407640

Title:
  Preview generation should not rely on glReadPixels

Status in the base for Ubuntu mobile products:
  New
Status in qtvideo-node package in Ubuntu:
  New

Bug description:
  Right now, snapshot/preview generation relies on a call to
  QGlFramebufferObject::toImage to obtain a QImage in
  http://bazaar.launchpad.net/~phablet-team/qtvideo-
  node/trunk/view/head:/src/snapshotgenerator.cpp#L118. Ultimately, this
  results in a very expensive call to glReadPixels, blocking the buffer
  processing of the camera app. Instead, we should avoid mapping the
  pixels to main memory and just copy the texture.

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