mln/fun/v2v/rgb8_to_rgbn.hh: Import rgb8 to rgbn conversion function from Yann's sandbox.

milena/mln/fun/v2v/rgb8_to_rgbn.hh

+// Copyright (C) 2010 EPITA Research and Development Laboratory (LRDE)
+//
+// This file is part of Olena.
+//
+// Olena is free software: you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation, version 2 of the License.
+//
+// Olena is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Olena.  If not, see <http://www.gnu.org/licenses/>.
+//
+// As a special exception, you may use this file as part of a free
+// software project without restriction.  Specifically, if other files
+// instantiate templates or use macros or inline functions from this
+// file, or you compile this file and link it with other files to produce
+// an executable, this file does not by itself cause the resulting
+// executable to be covered by the GNU General Public License.  This
+// exception does not however invalidate any other reasons why the
+// executable file might be covered by the GNU General Public License.
+
+#ifndef MLN_FUN_V2V_RGB8_TO_RGBN_HH
+# define MLN_FUN_V2V_RGB8_TO_RGBN_HH
+
+# include <mln/core/concept/function.hh>
+# include <mln/value/rgb8.hh>
+# include <mln/value/rgb.hh>
+# include <mln/core/contract.hh>
+
+/// \file
+///
+/// \brief Convert rgb8 value to rgbn, n < 8.
+
+
+namespace mln
+{
+
+  namespace fun
+  {
+
+    namespace v2v
+    {
+
+
+      /// \brief Convert a rgb8 value to a rgn, n < 8.
+      ///
+      /// \param n defines the output quantification used for the transformation.
+      ///
+      /// \ingroup modfunv2v
+      //
+      template <unsigned n>
+      struct rgb8_to_rgbn : Function_v2v< rgb8_to_rgbn<n> >
+      {
+	typedef value::rgb8   argument;
+	typedef value::rgb<n> result;
+
+	/// \brief Convert a rgb8 value to a rgn, n < 8.
+	///
+	/// \param[in] v the rgb8 value to convert.
+	///
+	/// Conversion is done by computing the size by which we
+	/// divide each rgb component.
+	//
+	result operator()(const argument& c) const;
+
+      };
+
+
+# ifndef MLN_INCLUDE_ONLY
+
+      /// \brief Convert a rgb8 value to a rgn, n < 8.
+      ///
+      /// \param n defines the output quantification used for the transformation.
+      ///
+      /// \ingroup modfunv2v
+      //
+      template <unsigned n>
+      typename rgb8_to_rgbn<n>::result
+      rgb8_to_rgbn<n>::operator()(const argument& c) const
+      {
+	mln_precondition(8 > n);
+
+	unsigned size = pow(2,(8-n));
+	/*
+	  std::cout << "c    : " << c << std::endl;
+	  std::cout << "red  : " << c.red() << std::endl;
+	  std::cout << "size : " << size << std::endl;
+	  std::cout << "res  : " << (c.red() / size) << std::endl;
+	  std::cout << "max  : " << (mln_max(mln::value::int_u<n>))<< std::endl;
+	*/
+	result   res(c.red() / size, c.green() / size, c.blue() / size);
+
+	return res;
+      }
+
+# endif // ! MLN_INCLUDE_ONLY
+
+
+    } // end of namespace mln::fun::v2v
+
+  } // end of namespace mln::fun
+
+} // end of namespace mln
+
+#endif // ! MLN_FUN_V2V_RGB8_TO_RGBN_HH

scribo/ChangeLog

+2010-11-15  Guillaume Lazzara  <z@lrde.epita.fr>
+
+	Import rgb8 to rgbn conversion function from Yann's sandbox.
+
+	* mln/fun/v2v/rgb8_to_rgbn.hh: New.
+
 2010-11-15  Guillaume Lazzara  <z@lrde.epita.fr>
 
 	* scribo/core/macros.hh: Remove deprecated macro.