答复: 答复: XRandR rotate support HW rotateor not?

[Alan Hourihane]

Yes, use the damage extension.

Look at the Intel driver as an example.

Alan.

On Fri, 2008-10-31 at 19:14 +0800, FloraGui at viatech.com.cn wrote:
> Dear Alan:
> 	If it action like this, what is feature of xrandr?
>      Do you mean we could realize some part function of xrandr rotate use damage extension?
> 
> -----邮件原件-----
> 发件人: Alan Hourihane [mailto:alanh at fairlite.co.uk] 
> 发送时间: 2008年10月31日 19:09
> 收件人: Flora Gui
> 抄送: xorg at lists.freedesktop.org
> 主题: Re: 答复: XRandR rotate support HW rotateor not?
> 
> You do accelerated drawing to the new offscreen framebuffer, and rotate
> blit the damaged regions.
> 
> Again, you should look at the intel driver for an example.
> 
> Alan.
> 
> On Fri, 2008-10-31 at 19:05 +0800, FloraGui at viatech.com.cn wrote:
> > Dear Alan:
> > 	Do you mean we can use damage extension to draw the update screen, so the draw speed can up a litter.
> > 	But the rotation action still use xrandr's software rotation method, is it right?
> > 
> > -----邮件原件-----
> > 发件人: Alan Hourihane [mailto:alanh at fairlite.co.uk] 
> > 发送时间: 2008年10月31日 18:47
> > 收件人: Flora Gui
> > 抄送: xorg at lists.freedesktop.org
> > 主题: Re: XRandR rotate support HW rotate or not?
> > 
> > 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.
> > 
> > 
>