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[directfb-users] Re: nvidia-setOpacity


  • To: directfb-users@directfb.org
  • Subject: [directfb-users] Re: nvidia-setOpacity
  • From: Ville Syrjälä <syrjala@sci.fi>
  • Date: Fri, 13 Feb 2004 18:07:52 +0200
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On Fri, Feb 13, 2004 at 02:49:45AM -0800, vivek wrote:
> > > I am using the gtk examples to check this. Is it
> > > using any other different layers ? could you 
> > > please explain me ?
> > 
> > Well I don't know what the gtk examples do exactly
> > but you are probably 
> > changing window opacity not layer opacity. Windows
> > are contained in 
> > layers.
> 
> Thanks Ville..
> So, Can I mean that, window opacity can be done only
> at software level and Layer opacity can be at Hardware
> level.  If I am wrong please correct me.

Window opacity can be hardware accelerated if the hardware + driver 
supports alpha blending blits.

Layer opacity always happens at hardware level.

-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/


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