[Olena-patches] 1647: Add image traits for mln::value::stack_image.

https://svn.lrde.epita.fr/svn/oln/trunk/milena Index: ChangeLog from Roland Levillain &lt;roland(a)lrde.epita.fr&gt; Add image traits for mln::value::stack_image. * mln/value/stack.hh (mln::trait::image_< mln::value::stack_image<n, I> >): New specialization. stack.hh | 39 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) Index: mln/value/stack.hh --- mln/value/stack.hh (revision 1646) +++ mln/value/stack.hh (working copy) @@ -1,4 +1,4 @@ -// Copyright (C) 2007 EPITA Research and Development Laboratory +// Copyright (C) 2007, 2008 EPITA Research and Development Laboratory (LRDE) // // This file is part of the Olena Library. This library is free // software; you can redistribute it and/or modify it under the terms @@ -93,7 +93,44 @@ } // end of namespace mln::value::internal + } // end of namespace mln::value + + + namespace trait + { + template <unsigned n, typename I> + struct image_< mln::value::stack_image<n, I> > + : default_image_morpher_< I, + metal::vec<n, mln_value(I)>, + mln::value::stack_image<n, I> > + { + // FIXME: We shall carefully define the missing required traits + // here. + typedef trait::image::category::value_morpher category; + + typedef trait::image::value::vectorial value; + /* FIXME: Setting the speed trait of a stack_image to `fast' is + a bad approximation. + + The value cannot reasonnably be `fastest', as several images + in different memory locations are involved in a stack image. + So we cannot just rely on the speed trait of I. + Nevertheless, we cannot guarantee that a stack_image will be + a least `fast': think of a stack_image over a ``slow'' + image_type (e.g., an image whose values are computed). That + image would retain the `slow' value of the speed trait. + + In conclusion, this value of the speed trait should be + computed too. */ + typedef trait::image::speed::fast speed; + }; + + } // end of namespace mln::trait + + + namespace value + { /*! \brief stack image class. stack_image stores a * vector of n images of the same domain. *