Hello,
I've noticed some inconsistency in what is currently exported as 'zpos'
DRM propery to userspace. Currently we create three planes, where the
zpos maps to the mixer 'win' (is this simply short for window?).
But this is wrong since the mixer layer configuration is currently done
in this way (in mixer_win_reset()):
layer1 (win[1]) > layer0 (win[0]) > video (win[2])
So layer1 is at the top of our stack, and the video layer is at the
bottom. So regardless on how you interpret the zpos property (0 being
the top, or 0 being bottom), it doesn't give you accurate information on
how the planes are ordered.
Related to this is the issue of how to blend planes. When should
blending of layer be enabled? We probably want to based this on three
states:
- which layer are enabled
- which pixelformats are associated to the layers
- in which order are the layers (*)
(*) So in the case of 'layer1 > layer0 > video', layer1 disabled,
layer0/video enabled, layer0 having alpha-pixelformat, we want to blend
layer0 and the video layer (so effectively making layer0 translucent).
I'm trying to come up with a proposition for that issue in the next
days, but it would really help to hear thoughts of you guys.
With best wishes,
Tobias
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