[Merge] lp:~albaguirre/qtubuntu/use-mir-rs-api into lp:qtubuntu

[Gerry Boland]

Review: Needs Information

I have a question about how pixel formats work with the newer Mir API. I see you've removed code where Qt could set a desired pixel format on the mir surface - is this feature impossible to replicate?

This was done because sometimes the EGL config chosen may have an alpha buffer enabled, even if Qt doesn't need it. We used the mir pixel format to inform the Mir compositor that blending is not required in that case - a nice optimisation.
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https://code.launchpad.net/~albaguirre/qtubuntu/use-mir-rs-api/+merge/321627
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