From apertus wiki
1 Frame Line Design Needs
- Accommodate multiple frame line formats and layouts simultaneously.
- Adjustable matte regions, when present.
- Provide discrete frame line output for viewfinder and monitor out.
2 Possible Design Solution
- Store a multiple static image buffer on board using an associated / premultiplied alpha format.
- Provide individual opacity variables for viewfinder and monitor out.
- Selected image is composited atop of live feed.