On Tue, Aug 20, 2002 at 12:40:17PM -0500, Eric Christopherson wrote:
> On Tue, Aug 20, 2002 at 08:17:53AM -0400, Jeff Brubaker wrote:
> > DirectFB is interesting because it provides a new method of providing
> > hardware acceleration to windowed applications. XFree86 has considered a
> > similar layered approach in the past but it never reached fruition
> > (probably because there are relatively few people interested/capable of
> > implementing it).
>
> Hi, Jeff. I was just wondering what you meant by "a similar layered
> approach." Are you talking about X entensions such as Render?
No, but work by the same author, Keith Packard. There was a post on either
Render or Xpert (XFree86 mailing lists) a year or two ago where he was talking
about alpha blending between windows. He had hacked up transparency support
for a demo that was supposedly extremely slow and mentioned he'd like to
implement per-window layers allocated on the video card such that you wouldn't
have exposures, which seems to be a necessity for windows covered by partially
transparent windows.
Ah hah, I found it! Google rocks. :)
http://marc.theaimsgroup.com/?l=xfree-render&m=100293063519210&w=2
DirectFB uses a similar approach, judging by the PDF on the web site.
Jeff
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