Juliusz Chroboczek <[EMAIL PROTECTED]> writes:
> MV> DGA really shouldn't be used and I regret that it's still in the
> MV> X-server. I would like it to disappear in XFree86 5.0.
>
> Mark,
>
> I fully agree with your feeling, and I am sincerely sorry to say what
> I'm about to say.
>
> There is no denying, though, that there are applications that want to
> do client-side rendering -- and I think that's a perfectly legitimate
> thing to do. The obvious solutions (PutImage and ShmPutImage) either
> involve one copy too many, or else require you to put your rendering
> buffers in a shared memory segment.
>
> I may be mistaken, but as far as I can see, the only way to do a
> direct blit from a random client-specified buffer is DGA. Unless we
> provide a different way to do that, there is little chance of DGA
> going away with no loss.
If you are willing to give up the "Random" then, you can use ShmPixmaps
or ShmImages and have:
Blit from framebuffer specified data to screen - XShmPutImage
Blit from RGB data to screen - RENDER
Blit from YUV, etc to screen - Xv
(I know less about the last.)
In the cases that this doesn't work, well, the overhead of an extra
memory => memory copy is just not all that significant these days.
I don't think it is worth throwing away the security and robustness
model and using DGA.
Regards,
Owen
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