[PATCH] Ensure blitter quiescience before reading pixels from the framebuffer

[Zhenyu Wang]

On 2007.07.31 09:09:11 +0000, Daniel Kasak wrote:
> 
> I've found this too, and not just with a composited desktop. Running
> Enlightenment with the XRENDER backend and EXA gives me about 1 fps with
> 100% CPU load with relatively mildly animated backgrounds ( I845G
> video ) - which run effortlessly at 30fps and low CPU load otherwise.
> Unfortunately the fastest method with E17 is still the software
> renderer, which seems quite counter-intuitive. Also tested with r300
> ( but of course the r300 driver notes that it doesn't accelerate XRENDER
> to start with ).
> 

I845G/830G don't support texture format like a8, x8r8g8b or x8b8g8r8, so
we have to fallback in those cases, if e17 uses much with them, it won't
be accelerated.