Code review comment for lp:~robertcarr/mir/alpha-for-nested-servers

Kevin DuBois (kdub) wrote :

Daniel makes a good point about the performance impact...

> The unity8 shell session will not take advantage of this background opacity.
> It will always just fill the screen with its dash. I assume if the background
> is filled with a surface, there isn't a performance overhead?

the final frame is the same, more work is done with alpha blending turned on

with blending off,
read src, write to dst

with blending on
read src, read dst, alpha blend operation, write to dst

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