Re: Destination alpha?

Juliusz Chroboczek <[email protected]> 12 Jun 2002 10:02:08 +0100

Newsgroups	gmane.comp.xfree86.render
Message-ID	<[email protected]>

>> I think maybe fewer 32bpp hardware can do destination alpha than
>> you realize.

KP> It's not so much a matter of "doing" destination alpha than of having 
KP> storage for any intermediate alpha values used in pixel computations.

Do hardware blits at least copy all 32 bits?  If not, opaque moves
will slow to a crawl.

                                        Juliusz