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

[Ivan Z. G. <iva...@ya...>]

Interesting...

I've had a look at vncJ.  I didn't even know such a thing existed.  vnc
is an awesome program!

I'm not sure why the swig team choose to use long.  Probably because
they wanted to support arithmetic operations.  I see now that in our
case, since we interpret as pixel data, things are different.  I will
investigate changing this but only when dealing with pixel data.  The
other instances of uint32 should remain longs I think.

-Ivan/

S. Meslin-Weber wrote:

>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 
>>range is not the same as the unsigned 32 bit int.
>>
>>Java Data Types:
>>
>>int
>>    4 bytes, signed (two's complement). -2,147,483,648 to 
>>2,147,483,647. Like all numeric types ints may be cast into other 
>>    
>>
>
>[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
>
>  
>