[squeak-dev] offscreen buffer/bitmap/array access

David T. Lewis lewis at mail.msen.com
Mon Feb 1 12:37:43 UTC 2010

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:



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