Comment 4 for bug 1256702

Daniel, the design docs is basically what we have now. I could dig up the original designs for 13.10, but you can see them on the device today. The alpha is needed to keep the same look and feel when unlocking after we implement a split greeter process. To be able to show the session beneath the greeter as we slide away.

You say we throw out all the performance work. Is that because all our optimization work assumed opaque backings or are you saying transparency is inherently unoptimizable?

This can be opt-in for greeter only, so we'd only affect the greeter.

If this is just too risky for Mir, we can go down another road and keep screenshots on the device to show. That has its own complexities, but could be done. I had assumed a transparent Mir would be better.