Re: [boost] GIL Image Processing Library - Fusion and TinyVector

From: Joel de Guzman (joel_at_[hidden])
Date: 2006-10-19 11:32:55

Ullrich Koethe wrote:
> Joel de Guzman wrote:
>>  > VIGRA doesn't have an explicit RGBA type (TinyVector<T, 4> can be used
>>  > instead), because so far no-one came up with a convincing proposal for
>>  > these operations. But without them, RGBA is pretty useless.
>>  >
>>
>> Hmmm... TinyVector<T, 4>... I think VIGRA should use Fusion for
>> that instead ;-)
>>
> 
> I had a look at Fusion, but I'm not sure whether it would be helpful in 
> this context. TinyVector is based on three design goals: it should support 
> the std::vector interface (except for resize etc.), 

Like boost::array?

it should be fast (you
> have millions of these beasts in a single image), 

Definitely.

and it should behave
> like a built-in arithmetic type (except for division which is problematic 
> because the zero vector is not the only one that may cause a 
> division-by-zero error). 

No problem. But have you seen Andy's work on matrices using fusion?

Fusion may be more helpful in heterogeneous pixel
> types, but they often have very specific requirements that are perhaps 
> better handled explicitly.

Like what, for example?

Cheers,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net