[Bug 93864] Performance degradation when one display is in rotation

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93864

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ta!

I pushed a partial revert of the first patch and this one:

commit 2bee35a86b77bc7371a81dfa1586398edde56917
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jan 27 11:00:04 2016 +0000

    sna: Restrict TearFree damage discarding to straightforward copies

    If we have a rotation, it is beneficial to keep the amount of work we
    need to do to a minimum. So restrict

    commit 9a311f9da612ba02b24458f6a40b6a5445ad4869
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Fri Feb 13 14:03:16 2015 +0000

        sna: Throw away the TearFree damage if it grows too big

    to only apply to TearFree and not if we have active RandR transforms.

    Reported-by: Frank Delache <franck.delache at grassvalley.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93864
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

commit 43fffc8ea93bef012928f077981d9bf7bb7c3023
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jan 27 10:42:47 2016 +0000

    sna: Perform composite rotation on the individual damage elements

    As the rotation may need to perform intermediate copies (e.g. displays
    larger than the render pipeline), we can reduce the amount of overdraw
    by using the damage boxes rather than preparing to redraw the entire
    output.

    Reported-by: Frank Delache <franck.delache at grassvalley.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93864
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

That should be a good compromise I hope. Can you please double check with
upstream/master?

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