offscreen buffer/bitmap/array access

> I've managed to work up a trivial access to the shm*   calls in Mac OS X
> so that I can obtain a pointer to a shared memory buffer. How can I
> render to this buffer without more c-level programming? The goal would
> be to take the shared memory address and use it to build various things
> like bitmaps, forms, etc. I've spent several hours rummaging around with
> google and searching the various squeak-related mailing lists, but there
> doesn't seem to be any Squeak way to draw to/write to an offscreen
> buffer which is only defined by an external address. Certainly, with far
> more work, I can devise ways to do this with FFI/plugins/etc but I'd
> like to prototype in smalltalk, not C.

> On Mon, Feb 01, 2010 at 04:49:58AM -0700, Lawson English wrote:
>  
>> I've managed to work up a trivial access to the shm*   calls in Mac OS X
>> so that I can obtain a pointer to a shared memory buffer. How can I
>> render to this buffer without more c-level programming? The goal would
>> be to take the shared memory address and use it to build various things
>> like bitmaps, forms, etc. I've spent several hours rummaging around with
>> google and searching the various squeak-related mailing lists, but there
>> doesn't seem to be any Squeak way to draw to/write to an offscreen
>> buffer which is only defined by an external address. Certainly, with far
>> more work, I can devise ways to do this with FFI/plugins/etc but I'd
>> like to prototype in smalltalk, not C.
>>    
>
> The SurfacePlugin (in VMMaker package) forms the basis for a number
> of plugins that do this sort of thing, and this recent posting by Josh
> Gargus may be of some help:
>
>   http://lists.squeakfoundation.org/pipermail/vm-dev/2010-January/003820.html
>
> Dave
>
>
>
>  

> Look at the surfacePlugin
>
> http://www.squeakvm.org/cgi-bin/viewcvs.cgi/trunk/platforms/Cross/plugins/SurfacePlugin/
> and a working xample .
> http://www.squeakvm.org/cgi-bin/viewcvs.cgi/trunk/platforms/Mac%20OS/plugins/QuicktimePlugin/?rev=2148
>
> Also you should be aware of
> http://bugs.squeak.org/view.php?id=5236
> which killed our usage of the QuicktimePlugin to do a surface in Sophie. However we did use the stQuicktimeSetSemaphorefor logic
> so that quicktime could tell us when a frame rendered so we could pull the frame from quicktime to squeak.
>
>
> On 2010-02-01, at 3:49 AM, Lawson English wrote:
>
>  
>> I've managed to work up a trivial access to the shm*   calls in Mac OS X so that I can obtain a pointer to a shared memory buffer. How can I render to this buffer without more c-level programming? The goal would be to take the shared memory address and use it to build various things like bitmaps, forms, etc. I've spent several hours rummaging around with google and searching the various squeak-related mailing lists, but there doesn't seem to be any Squeak way to draw to/write to an offscreen buffer which is only defined by an external address. Certainly, with far more work, I can devise ways to do this with FFI/plugins/etc but I'd like to prototype in smalltalk, not C.
>>
>>
>> Lawson
>>
>>    
>
> --
> ===========================================================================
> John M. McIntosh <[hidden email]>   Twitter:  squeaker68882
> Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
> ===========================================================================
>
>
>
>
>
>
>  

> On Mon, Feb 01, 2010 at 04:49:58AM -0700, Lawson English wrote:
> > I've managed to work up a trivial access to the shm*   calls in Mac OS X
> > so that I can obtain a pointer to a shared memory buffer. How can I
> > render to this buffer without more c-level programming? The goal would
> > be to take the shared memory address and use it to build various things
> > like bitmaps, forms, etc. I've spent several hours rummaging around with
> > google and searching the various squeak-related mailing lists, but there
> > doesn't seem to be any Squeak way to draw to/write to an offscreen
> > buffer which is only defined by an external address. Certainly, with far
> > more work, I can devise ways to do this with FFI/plugins/etc but I'd
> > like to prototype in smalltalk, not C.
>
> The SurfacePlugin (in VMMaker package) forms the basis for a number
> of plugins that do this sort of thing, and this recent posting by Josh
> Gargus may be of some help:
>
>   http://lists.squeakfoundation.org/pipermail/vm-dev/2010-January/003820.html
>
> Dave
>
>