Op 23/12/2015 om 20:32 schreef Konstantin Tokarev:
Hi all,
I'm running QML on embedded device (IPTV set-top box) which has separate
hardware layer fo video output, placed under UI layer where QML paints.
Now I'd like create QML item providing transparent "hole", i.e. transparent rect hich
would not blend with content underneath, but "erasing" it (so that video layer becomes
unobscured).
In widgets API I could draw transparent rect with QPainter using
CompositionMode_Clear. Is it possible to achieve the same thing in QML?
Solution (ab)using private APIs is acceptable for me.
Couldn't you just not have items in your scenegraph in that rect?
Otherwise a solution using a shader to just delete the fragments
(pixels) in the area of interest comes to mind, but I have no experience
writing those. ShaderEffect may be of help there.
André
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