** Changed in: canonical-devices-system-image
Assignee: John McAleely (john.mcaleely) => (unassigned)
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https://bugs.launchpad.net/bugs/1407640
Title:
Preview generation should not rely on glReadPixels
Status in Canonical System Image:
Confirmed
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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