Re: [Boost-users] [GIL] Black filled or not ?

Subject: Re: [Boost-users] [GIL] Black filled or not ?
From: Eloi Du Bois (eloi.du.bois_at_[hidden])
Date: 2010-01-13 15:45:49

Okay, I see.
But the problem is that I don't know the pixel number of channel. It have to
be full generic.
That's why I am trying this (unsuccessfully):
    comp_pixel_t black;
    color_convert( bgil::gray8_pixel_t( 0 ), black );
    fill_pixels( tmpv, black);

2010/1/13 Christian Henning <chhenning_at_[hidden]>

> Please use:
>
>    fill_pixels( tmpv, comp_pixel_t( 0.f, 0.f, 0.f ));
>
> This call wont be a memset unfortunately. But you could always just
> get the char* and memset yourself.
>
> Regards,
> Christian
>
> On Wed, Jan 13, 2010 at 11:40 AM, Eloi Du Bois <eloi.du.bois_at_[hidden]>
> wrote:
> > I tried to do a fill_pixels, but the thing is I get an error (because I
> am
> > doing special things) on something like this:
> >
> >         typedef pixel<bits32f, devicen_layout_t<
> num_channels<View>::value >
> >> comp_pixel_t;
> >         typedef image<comp_pixel_t, false, std::allocator<unsigned char>
> >
> > comp_image_t;
> >         typedef typename view_type_from_pixel<comp_pixel_t>::type
> > comp_view_t;
> >         typedef typename comp_view_t::x_iterator tmp_iterator;
> >
> >         comp_image_t itmp( dst.dimensions( ) );
> >         comp_view_t tmpv( view( itmp ) );
> >         fill_pixels(tmpv, 0);
> >
> > But this is not working...
> >
> > Anyway,
> > thank you
> > Eloi.
> >
> > 2010/1/13 Christian Henning <chhenning_at_[hidden]>
> >>
> >> Hi Eloi, for performance reasons gil is not initializing the array
> >> with a default value. Also, I wouldn't trust the compiler to do
> >> anything special since it might be different from platform to
> >> platform. Just call fill_pixels which in your case ( rgb32f_image_t )
> >> should be reduced to a memset call.
> >>
> >> Regards,
> >> Christian
> >>
> >> On Wed, Jan 13, 2010 at 7:37 AM, Eloi Du Bois <eloi.du.bois_at_[hidden]>
> >> wrote:
> >> > Hi all !
> >> >
> >> > I would like to know, when creating an image like that:
> >> > rgb32f_image_t img(w, h);
> >> >
> >> > is the image filled with 0 by default or should I call fill_pixels ?
> >> >
> >> > Thank you !
> >> > Eloi.
> >> >
> >> > _______________________________________________
> >> > Boost-users mailing list
> >> > Boost-users_at_[hidden]
> >> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >> >
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