if I recall correctly, the window manager in OSX uses double-buffering, 
and 10.2 uses GL to speed the transparancies.  however, it's not as fast...

Nicos Gollan wrote:

>On Sunday 01 September 2002 16:35, Miquel van Smoorenburg wrote:
>  
>
>>In article <[EMAIL PROTECTED]>,
>>
>>Christian Schoenebeck  <[EMAIL PROTECTED]> wrote:
>>    
>>
>>>I'm still waiting for the ability to use real transparency. What's
>>>the deal with this anyway? I mean, what is the problem that there's
>>>still only pseudo transparency?
>>>      
>>>
>>Someone has to design how this fits in with the existing X11
>>protocol, probably develop an extension, then write the code,
>>and invent and document an API for this.
>>    
>>
>
>I think that's exactly what the XRender extension is supposed to do. It 
>works fairly well, but it does apparently still work with a snapshot to 
>create transparency. I don't know enough about the X11 protocol to say 
>anything definitive, but I think, part of the problem is that hidden 
>parts of the desktop are just not transmitted for a redraw which would 
>be necessary for true transparency to work.
>
>Another problem that's rather serious is the question "what for". IMHO, 
>that's the real problem hampering the development of such gimmicks.
>
>  
>




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