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+/*************************************************************************
+ *
+ *  OpenOffice.org - a multi-platform office productivity suite
+ *
+ *  $RCSfile: intconversion.hxx,v $
+ *
+ *  $Revision: 1.1 $
+ *
+ *  last change: $Author: thb $ $Date: 2006-07-11 11:38:56 $
+ *
+ *  The Contents of this file are made available subject to
+ *  the terms of GNU Lesser General Public License Version 2.1.
+ *
+ *
+ *    GNU Lesser General Public License Version 2.1
+ *    =============================================
+ *    Copyright 2005 by Sun Microsystems, Inc.
+ *    901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Lesser General Public
+ *    License version 2.1, as published by the Free Software Foundation.
+ *
+ *    This library 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
+ *    Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with this library; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *    MA  02111-1307  USA
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_BASEBMP_INTCONVERSION_HXX
+#define INCLUDED_BASEBMP_INTCONVERSION_HXX
+
+#include <vigra/rgbvalue.hxx>
+#include <functional>
+
+namespace basebmp
+{
+    // metafunctions to retrieve correct POD from/to basebmp::Color
+    //------------------------------------------------------------------------
+
+    /// type-safe conversion from RgbValue to packed int32
+    template< class RgbVal > struct UInt32FromRgbValue
+    {
+        sal_uInt32 operator()( RgbVal const& c ) const
+        {
+            return (c[0] << 16) | (c[1] << 8) | c[2];
+        }
+    };
+
+    /// type-safe conversion from packed int32 to RgbValue
+    template< class RgbVal > struct RgbValueFromUInt32
+    {
+        RgbVal operator()( sal_uInt32 c ) const
+        {
+            return RgbVal((c >> 16) & 0xFF,
+                          (c >> 8) & 0xFF,
+                          c & 0xFF);
+        }
+    };
+
+    /// Get converter from given data type to sal_uInt32
+    template< typename DataType > struct uInt32Converter
+    {
+        typedef std::identity<DataType> to;
+        typedef std::identity<DataType> from;
+    };
+    template< unsigned int RedIndex,
+              unsigned int GreenIndex,
+              unsigned int BlueIndex > struct uInt32Converter<
+                  vigra::RGBValue< sal_uInt8,
+                                   RedIndex,
+                                   GreenIndex,
+                                   BlueIndex > >
+    {
+        typedef UInt32FromRgbValue<
+            vigra::RGBValue< sal_uInt8,
+                             RedIndex,
+                             GreenIndex,
+                             BlueIndex > >
+            to;
+        typedef RgbValueFromUInt32<
+            vigra::RGBValue< sal_uInt8,
+                             RedIndex,
+                             GreenIndex,
+                             BlueIndex > >
+            from;
+    };
+}
+
+#endif /* INCLUDED_BASEBMP_INTCONVERSION_HXX */