Alpha (masking) display output

Registered by reltnek on 2017-12-04

For external video mixing, an alpha channel is very useful. In one case, the text can be overlaid on a video background. Another case is picture-in-picture, where the OpenLP output can disappear when the blanked (https://www.youtube.com/watch?v=M4Dk_zx07PI). This feature would require a third screen output that matches the second screen. The output on this would be a greyscale image where black means transparent and white means opaque. It is proposed that the alpha channel output could have two separate options (check boxes):
1. transparent alpha (whole window) when blank (not blank to desktop or blank to theme)
2. transparent alpha where background is transparent

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
reltnek
Direction:
Needs approval
Assignee:
reltnek
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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