I suggest some simple glReadPixels is sufficient :)
Mir's current screen{shot,cast} infrastructure is a bit complicated and
designed on the assumption that rendering everything twice is faster
than rendering everything once with a glReadPixels in the loop. I think
that assumption may yet be proven false. So a simple glReadPixels could
work (even from inside QtMir).
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https://bugs.launchpad.net/bugs/1369644
Title:
[enhancement] Should be possible to take a screen shot on the phone
from the phone itself
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