Isn't there already support for external bitmaps/surfaces? I remember doing some things that feel related to this with andreas decades ago
You're right. See the SurfacePlugin. Didn't know it could be used like this. Anyone have any pointers to examples, etc?
> On 2022-06-23, at 10:41 AM, Eliot Miranda <eliot.miranda@gmail.com> wrote:
>
>
>
> On Thu, Jun 23, 2022 at 10:28 AM Tony Garnock-Jones <tonyg@leastfixedpoint.com> wrote:
> On 6/23/22 18:15, Eliot Miranda wrote:
> > Can you say more about your use case?
>
> I've been implementing the X11 protocol in pure Smalltalk and I want to
> use a little bit of FFI to shmget/shmat and use that to get the pixels
> over to the X server. At present XPutImage is working but flooding the
> server with XPutImage seems to run into a rate limit from time to time
> so it's not very usable. Best to switch to mmap/shm if I can.
>
> Technical:
>
> So in this use including the header in the first page would be ok? Would the mapping be read-only from the perspective of the X server? Do you need shmget to be run via the FFI or would it be OK to invoke it implicitly as part of a mapping allocation primitive? Would it be better to create the mapping via the FFI and provide the mapping to the allocation primitive? How should the mapping be taken down?
>
> Windows folks, how portable is this idea to other OS's, especially windows? (I'm guessing this is a standard facility on most leading OS's). So would it be worth evolving towards a cross-platform abstraction?
>
> Procedural:
> Would you be prepared to build the VM to test this? Perhaps even generate it from sources? To what extent would you be able to collaborate with e.g. Tom & myself in implementing this?
>
> _,,,^..^,,,_
> best, Eliot
tim
--
tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim
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