XRandr rotation and hardware acceleration

Alex Deucher alexdeucher at gmail.com
Thu Feb 12 12:24:07 PST 2009

On Thu, Feb 12, 2009 at 2:36 PM, Bipin George Mathew <bipingm at gmail.com> wrote:
> Hi,
> I was reading about the XRandR extension here
> http://keithp.com/~keithp/talks/randr/randr/ and it under the Rotation using
> Xrandr it mentions this "This implementation causes a slight loss of
> performance as no rendering is accelerated and also uses additional main
> memory for a copy of the frame bufffer" . Is this this true for the current
> implemenation of XRandR - that we could miss out on hardware accleration if
> we rotate the screen? OR have I misunderstood Keith's statement.

Rotation will be accelerated if the driver accelerates composite.  In
most drivers this means using EXA acceleration.


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