Re: [sdljava-users] Anyone using get/setPixelDataXX()?

[S. Meslin-W. <st...@ta...>]

Hi Rainer,

On Tue, Jul 19, 2005 at 12:04:57AM +0200, Rainer Koschnick wrote:
> Maybe there's nothing to fix.  Java primitives are always signed so the=
=20
> range is not the same as the unsigned 32 bit int.
>
> Java Data Types:
>=20
> int
>     4 bytes, signed (two's complement). -2,147,483,648 to=20
> 2,147,483,647. Like all numeric types ints may be cast into other=20

[snip]

So... 32 bits, right? we're dealing with pixel data here, not arithmetic
operations. When I deal with colour information, each byte is treated as
unsigned and upcasted to int (Java does love its ints); things are then
repacked into 32bits, again ignoring signs. The fact that Java deems
them signed isn't relevant in this context.

So ok, since SWIG is multipurpose, perhaps we simply need to let it know
that we have a specific interpretation of these type conversions?

Cheers,

Steph

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Stephane Meslin-Weber         Email: st...@ta...
Senior Software Engineer      Web: http://odonata.tangency.co.uk
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