Re: [Vxl-users] wrapping view around existing resource

[Ian S. <ian...@st...>]

Christoph John wrote:
> Hello together, I have a little question concerning the right usage of vil.
> 
> I have an unsigned char* imgData[] in RGBRGB... order. I am trying to wrap an view around the resource and copy it into another resource with put_view. 
> How are the parameters for vil_new_image_resource and vil_image_view?
> 
> Thanks for your help.
> 
> Cheers
>  Christoph

The following constructor is used to wrap a view around
a block of memory.
//  Set this view to look at someone else's memory data.
   vil_image_view::vil_image_view (const T *top_left,
     unsigned ni, unsigned nj, unsigned nplanes,
     vcl_ptrdiff_t i_step, vcl_ptrdiff_t j_step,
     vcl_ptrdiff_t plane_step);

i.e.

//For a single-plane RGB image
   vil_image_view<vil_rgb<vxl_byte> > my_rgb_view(imgData,
     ni, nj, 1,
     1, ni, ni*nj);
or
// For a 3-plane ni x nj image
   vil_image_view<vxl_byte> my_3plane_view(imgData,
     ni, nj, 3,
     3,  3*ni, 1);


To wrap an image_resource around that, use
vil_image_resource_sptr vil_new_image_resource_of_view(
   vil_image_view_base const & view);

Ian.
i.e.
vil_image_resource_sptr my_resource = vil_new_image_resource_of_view(
   vil_image_view_base const & my_3plane_view);