XRandR rotate support HW rotate or not?

[Alan Hourihane]

On Fri, 2008-10-31 at 17:50 +0800, FloraGui at viatech.com.cn wrote:
> Dear Keith Packard：
> 
>       I have recently study RandR,  I found if we use RandR rotate no
> matter static rotate or dynamic rotate，we always use RandR’s own
> software rotate.
> 
>       We draw the screen desktop very slow,  how can we support HW
> rotate using RandR or it is a RandR limitation, if it is, RandR1.3 has
> support HW rotate or not ?
> 
>       Thanks a lot!

It is possible to support HW accelerated rotation.

You can use the damage extension to get rectangular regions to do
rotated blits.

You can look at the Intel driver to see how this is done for an example.

Alan.