1b4dff2c37
Change-Id: If703da1323e38df1c5e84d97a7d467dc8e639421 Reviewed-on: https://gerrit.libreoffice.org/19618 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
125 lines
4.4 KiB
C++
125 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_BASEBMP_INC_COLORTRAITS_HXX
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#define INCLUDED_BASEBMP_INC_COLORTRAITS_HXX
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#include <accessoradapters.hxx>
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#include <metafunctions.hxx>
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#include <vigra/mathutil.hxx>
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namespace basebmp
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{
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/** Functor template, to calculate alpha blending between two
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values. Float case.
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@tpl polarity
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When true, 0 means fully transparent, and 1 fully opaque. And vice
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versa.
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*/
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template< typename ValueType,
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typename AlphaType,
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bool polarity > struct BlendFunctor;
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template< typename ValueType,
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typename AlphaType > struct BlendFunctor<ValueType,AlphaType,true>
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: public TernaryFunctorBase<AlphaType,ValueType,ValueType,ValueType>
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{
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ValueType operator()( AlphaType alpha,
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ValueType v1,
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ValueType v2 ) const
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{
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const typename vigra::NumericTraits<AlphaType>::RealPromote fAlpha(
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vigra::NumericTraits<AlphaType>::toRealPromote(alpha));
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return (vigra::NumericTraits<AlphaType>::one()-fAlpha)*v1 + fAlpha*v2;
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}
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};
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template< typename ValueType,
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typename AlphaType > struct BlendFunctor<ValueType,AlphaType,false>
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: public TernaryFunctorBase<AlphaType,ValueType,ValueType,ValueType>
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{
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ValueType operator()( AlphaType alpha,
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ValueType v1,
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ValueType v2 ) const
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{
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const typename vigra::NumericTraits<AlphaType>::RealPromote fAlpha(
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vigra::NumericTraits<AlphaType>::toRealPromote(alpha));
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return fAlpha*v1 + (vigra::NumericTraits<AlphaType>::one()-fAlpha)*v2;
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}
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};
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/** Functor template, to calculate alpha blending between two
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values. Integer case.
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@tpl polarity
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When true, 0 means fully transparent, and 1 fully opaque. And vice
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versa.
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*/
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template< typename ValueType,
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typename AlphaType,
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bool polarity > struct IntegerBlendFunctor;
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template< typename ValueType,
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typename AlphaType > struct IntegerBlendFunctor<ValueType,AlphaType,true>
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: public TernaryFunctorBase<AlphaType,ValueType,ValueType,ValueType>
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{
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ValueType operator()( AlphaType alpha,
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ValueType v1,
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ValueType v2 ) const
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{
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return (vigra::NumericTraits<AlphaType>::toPromote(
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vigra::NumericTraits<AlphaType>::max()-alpha)*v1 + alpha*v2) /
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vigra::NumericTraits<AlphaType>::max();
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}
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};
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template< typename ValueType,
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typename AlphaType > struct IntegerBlendFunctor<ValueType,AlphaType,false>
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: public TernaryFunctorBase<AlphaType,ValueType,ValueType,ValueType>
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{
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ValueType operator()( AlphaType alpha,
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ValueType v1,
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ValueType v2 ) const
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{
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return (alpha*v1 +
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vigra::NumericTraits<AlphaType>::toPromote(
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vigra::NumericTraits<AlphaType>::max()-alpha)*v2) /
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vigra::NumericTraits<AlphaType>::max();
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}
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};
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template< typename ColorType > struct ColorTraits
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{
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/// Metafunction to select blend functor from color and alpha type
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template< typename AlphaType, bool polarity > struct blend_functor : public
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ifScalarIntegral< AlphaType,
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IntegerBlendFunctor< ColorType, AlphaType, polarity >,
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BlendFunctor< ColorType, AlphaType, polarity > > {};
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/// Type of a color component (i.e. the type of an individual channel)
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typedef ColorType component_type;
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};
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} // namespace basebmp
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#endif /* INCLUDED_BASEBMP_INC_COLORTRAITS_HXX */
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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