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Diffstat (limited to 'basebmp/inc/basebmp/colorblendaccessoradapter.hxx')
-rw-r--r-- | basebmp/inc/basebmp/colorblendaccessoradapter.hxx | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/basebmp/inc/basebmp/colorblendaccessoradapter.hxx b/basebmp/inc/basebmp/colorblendaccessoradapter.hxx new file mode 100644 index 000000000000..299db2212ce4 --- /dev/null +++ b/basebmp/inc/basebmp/colorblendaccessoradapter.hxx @@ -0,0 +1,151 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2008 by Sun Microsystems, Inc. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * $RCSfile: colorblendaccessoradapter.hxx,v $ + * $Revision: 1.4 $ + * + * 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 */ |