Re: [boost] GIL Image Processing Library - responses and more comments

From: Joel de Guzman (joel_at_[hidden])
Date: 2006-10-18 18:26:06

Hailin Jin wrote:
> Hi Ulli -- good question.
> 
> Under GCC, all the four versions (read/write, proxy/accessor) run at the 
> same speed (fastest). However, under Visual Studio, interleaved=>planar 
> is faster than planar=>interleaved with your original code 
> (interleaved=>planar runs at the same speed as the ones under GCC). But 
> after I added a method for RGBValue as follows:
>     template <typename T2>
>     RGBValue& operator=(const T2& pa) {
>         r=pa.r; g=pa.g; b=pa.b;
>         return *this;
>     }
> the proxy version for interleaved=>planar runs as fast as all others. 
> The only one left slower is the accessor version for 
> planar=>interleaved. My guess is that in the accessor version, the 
> compiler may create an unnecessary temporary object after dereferencing 
> the planar proxy. This could be something interesting for you to look into.

Ok, If I haven't mentioned in my review, I'll also want to see
benchmarks. That'll be really nice.

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