On 6/27/2010 10:59 AM, Kartik Thakore wrote:

Hi

Ok I looked at get_dataref. But I still don't understand why the
surface->pixels is swaped out when a piddle is written. Both of the
Devel::Peek for the get_dataref and surface->get_pixels is the exact same.

get_dataref is a perl reference to the data section of
the piddle.  The surface->pixels is just a pointer to
the pixel data.  I see no copying of data in the code so
it doesn't seem like they should be the same.

I notice on the page you reference for the XS stuff that
there is a surface_new_from routine.  Have you tried
creating a piddle of data the size and structure of the
surface and then creating the desired surface from that?

At least you would have all the surface and piddle data
in the same spot which seems to be your difficulty here.

--Chris

On Sun, Jun 27, 2010 at 1:32 AM, Chris Marshall <c...@alum.mit.edu
<mailto:c...@alum.mit.edu>> wrote:

    On 6/26/2010 10:49 PM, Kartik Thakore wrote:

        Right but where is the piddle xs code?


    It is in Basic/Core in the PDL  directory.
    The piddle data is in the string of the perl scalar.
    That way it gets the advantage of the perl memory
    allocation/freeing...

    --Chris

        On Sat, Jun 26, 2010 at 10:35 PM, Chris Marshall
        <c...@alum.mit.edu <mailto:c...@alum.mit.edu>
        <mailto:c...@alum.mit.edu <mailto:c...@alum.mit.edu>>> wrote:

            On 6/26/2010 10:10 PM, Kartik Thakore wrote:

                What SV_type is getdata_ref using? where can I find that?


            You can get a copy of the PDL source from CPAN
            and that should explain things.

            --Chris





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