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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org 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 version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#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 other
+ sensible default behaviour for these methods.
+ */
+template< class WrappedAccessor,
+ typename AlphaType,
+ bool polarity > 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,polarity>::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 */
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */