Re: [Boost-users] [GIL] Performance warning...

Subject: Re: [Boost-users] [GIL] Performance warning...
From: Christian Henning (chhenning_at_[hidden])
Date: 2009-11-28 14:10:12

I have done some testing and on my machine ( MSVC10 in x64 ). The new
code ( using const & ) is slightly faster than the old code ( using
value type ). Not by much, but at least it's not slower. See below for
my test.

I also think that since the default_channel_converter is using const&
the following channel_converter functions should do the same. Does
that makes sense in your eyes?

#include <iostream>

#include <boost\timer.hpp>
#include <boost\gil\gil_all.hpp>

using namespace std;
using namespace boost;
using namespace gil;

int _tmain(int argc, _TCHAR* argv[])
{
   rgba8_image_t src( 10000, 10000 );
   fill_pixels( view( src ), rgba8_pixel_t( 12,12,12,12 ));
   rgba32_image_t dst( 10000, 10000 );

   timer t;

   for( size_t i = 0; i < 10; i++ )
      copy_and_convert_pixels( view( src ), view( dst ) );

   cout << t.elapsed() << " sec" << endl;

        return 0;
}

Regards,
Christian