[Bug 768160] qtplugins: How to implement qmlglsrc.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768160

--- Comment #5 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #1)
> qmlglsrc as a screen grabber of the qml scene graph is in general a bad idea
> for performance reasons as you have to perform a readback (bad) of the GL
> front buffer (also bad).  If possible, you should attempt to retrieve your
> rendering before qmlglsink and pass that downstream.
> 
> That being said, it's possible that screen grabbing may be your only option
> so something like that would be useful.

Any comments for my code?

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