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+/*************************************************************************
+ *
+ *  OpenOffice.org - a multi-platform office productivity suite
+ *
+ *  $RCSfile: colorblendaccessoradapter.hxx,v $
+ *
+ *  $Revision: 1.1 $
+ *
+ *  last change: $Author: thb $ $Date: 2006-07-06 10:02:07 $
+ *
+ *  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_COLORBLENDACCESSORADAPTER_HXX
+#define INCLUDED_BASEBMP_COLORBLENDACCESSORADAPTER_HXX
+
+#include <basebmp/colortraits.hxx>
+
+namespace basebmp
+{
+
+/** Accessor adapter that blends input value against fixed color value
+
+    Used to blend an alpha mask 'through' a fixed color value into the
+    destination.
+
+    The getter functors return a constant value (usually the zero of
+    the value type, this preserves the original destination content
+    when blitting through a mask) - there really isn't no sensible
+    default behaviour for these methods.
+ */
+template< class WrappedAccessor,
+          typename AlphaType > class ConstantColorBlendSetterAccessorAdapter
+{
+public:
+    typedef AlphaType                            alpha_type;
+    typedef AlphaType                            value_type;
+    typedef typename WrappedAccessor::value_type color_type;
+
+private:
+    typename ColorTraits< color_type >::
+             template blend_functor<alpha_type>::type   maFunctor;
+    WrappedAccessor                                     maWrappee;
+    color_type                                          maBlendColor;
+    value_type                                          maGetterValue;
+
+public:
+    ConstantColorBlendSetterAccessorAdapter() :
+        maFunctor(),
+        maWrappee(),
+        maBlendColor(),
+        maGetterValue()
+    {}
+
+    template< class T > explicit ConstantColorBlendSetterAccessorAdapter( T acc ) :
+        maFunctor(),
+        maWrappee(acc),
+        maBlendColor(),
+        maGetterValue()
+    {}
+
+    template< class T > ConstantColorBlendSetterAccessorAdapter( T          acc,
+                                                                 color_type col ) :
+        maFunctor(),
+        maWrappee(acc),
+        maBlendColor(col),
+        maGetterValue()
+    {}
+
+    template< class T > ConstantColorBlendSetterAccessorAdapter( T          acc,
+                                                                 color_type col,
+                                                                 value_type val ) :
+        maFunctor(),
+        maWrappee(acc),
+        maBlendColor(col),
+        maGetterValue(val)
+    {}
+
+    // -------------------------------------------------------
+
+    void        setColor( color_type col ) { maBlendColor=col; }
+    color_type  getColor() { return maBlendColor; }
+    void        setGetterValue( value_type val ) { maGetterValue=val; }
+    value_type  getGetterValue() { return maGetterValue; }
+
+    // -------------------------------------------------------
+
+    WrappedAccessor const& getWrappedAccessor() const { return maWrappee; }
+    WrappedAccessor&       getWrappedAccessor() { return maWrappee; }
+
+    // -------------------------------------------------------
+
+    /// @return constant value, regardless of iterator content
+    template< typename IteratorType > value_type operator()(IteratorType const& ) const
+    {
+        return maGetterValue;
+    }
+    /// @return constant value, regardless of iterator content
+    template< typename IteratorType, class Difference >
+    value_type operator()(IteratorType const& , Difference const& ) const
+    {
+        return maGetterValue;
+    }
+
+    // -------------------------------------------------------
+
+    template< typename V, typename IteratorType >
+    void set(V const& value, IteratorType const& i) const
+    {
+        maWrappee.set(
+            maFunctor(
+                vigra::detail::RequiresExplicitCast<alpha_type>::cast(value),
+                maWrappee(i),
+                maBlendColor),
+            i );
+    }
+
+    template< typename V, typename IteratorType, class Difference >
+    void set(V const& value, IteratorType const& i, Difference const& diff) const
+    {
+        maWrappee.set(
+            maFunctor(
+                vigra::detail::RequiresExplicitCast<alpha_type>::cast(value),
+                maWrappee(i,diff),
+                maBlendColor),
+            i,
+            diff );
+    }
+};
+
+} // namespace basebmp
+
+#endif /* INCLUDED_BASEBMP_COLORBLENDACCESSORADAPTER_HXX */