LCOV - code coverage report
Current view: top level - include/basebmp - accessorfunctors.hxx (source / functions) Hit Total Coverage
Test: commit c8344322a7af75b84dd3ca8f78b05543a976dfd5 Lines: 8 8 100.0 %
Date: 2015-06-13 12:38:46 Functions: 9 13 69.2 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_BASEBMP_ACCESSORFUNCTORS_HXX
      21             : #define INCLUDED_BASEBMP_ACCESSORFUNCTORS_HXX
      22             : 
      23             : #include <osl/diagnose.h>
      24             : #include <basebmp/metafunctions.hxx>
      25             : 
      26             : #include <functional>
      27             : 
      28             : namespace basebmp
      29             : {
      30             : 
      31             : // Some common accessor functors
      32             : 
      33             : 
      34             : 
      35             : /// combine two values via XOR
      36             : template< typename T > struct XorFunctor : public std::binary_function<T,T,T>
      37             : {
      38    14193115 :     T operator()( T v1, T v2 ) const { return v1 ^ v2; }
      39             : };
      40             : 
      41             : 
      42             : 
      43             : /// Base class, passing on the arg types
      44             : template< typename T, typename M > struct MaskFunctorBase :
      45             :         public TernaryFunctorBase<T,M,T,T> {};
      46             : 
      47             : 
      48             : /** Let a mask flag decide between two values
      49             : 
      50             :     @tpl polarity
      51             :     Mask polarity. When true, a false in the mask denotes
      52             :     transparency, i.e. the original value will display. And vice
      53             :     versa.
      54             :  */
      55             : template< typename T,
      56             :           typename M,
      57             :           bool     polarity > struct GenericOutputMaskFunctor : public MaskFunctorBase<T,M>
      58             : {
      59             :     /// Ternary mask operation - selects v1 for !m == polarity, v2 otherwise
      60    67135696 :     T operator()( T v1, M m, T v2 ) const
      61             :     {
      62    67135696 :         return !m == polarity ? v1 : v2;
      63             :     }
      64             : };
      65             : 
      66             : /** Let a mask bit decide between two values (specialization for
      67             :     integer mask types)
      68             :  */
      69             : template< typename T,
      70             :           typename M,
      71             :           bool     polarity > struct IntegerOutputMaskFunctor;
      72             : template< typename T,
      73             :           typename M > struct IntegerOutputMaskFunctor<T,M,true> : public MaskFunctorBase<T,M>
      74             : {
      75             :     /** Mask v with state of m
      76             : 
      77             :         @return v2, if m != 0, v1 otherwise.
      78             :      */
      79             :     T operator()( T v1, M m, T v2 ) const
      80             :     {
      81             :         typedef typename make_unsigned<T>::type unsigned_T;
      82             : 
      83             :         // mask will be 0, iff m == 0, and 1 otherwise
      84             :         const T mask( unsigned_cast<T>(m | -m) >> (sizeof(unsigned_T)*8 - 1) );
      85             :         return v1*static_cast<M>(1-mask) + v2*mask;
      86             :     }
      87             : };
      88             : template< typename T,
      89             :           typename M > struct IntegerOutputMaskFunctor<T,M,false> : public MaskFunctorBase<T,M>
      90             : {
      91             :     /** Mask v with state of m
      92             : 
      93             :         @return v2, if m != 0, v1 otherwise.
      94             :      */
      95             :     T operator()( T v1, M m, T v2 ) const
      96             :     {
      97             :         typedef typename make_unsigned<T>::type unsigned_T;
      98             : 
      99             :         // mask will be 0, iff m == 0, and 1 otherwise
     100             :         const T mask( unsigned_cast<T>(m | -m) >> (sizeof(unsigned_T)*8 - 1) );
     101             :         return v1*mask + v2*static_cast<M>(1-mask);
     102             :     }
     103             : };
     104             : 
     105             : /** Let a mask bit decide between two values (specialization for
     106             :     binary-valued mask types)
     107             :  */
     108             : template< typename T, typename M, bool polarity > struct FastIntegerOutputMaskFunctor;
     109             : template< typename T, typename M > struct FastIntegerOutputMaskFunctor<T,M,true> :
     110             :    public MaskFunctorBase<T,M>
     111             : {
     112             :     /// Specialization, only valid if mask can only attain 0 or 1
     113             :     T operator()( T v1, M m, T v2 ) const
     114             :     {
     115             :         OSL_ASSERT(m<=1);
     116             : 
     117             :         return v1*static_cast<M>(1-m) + v2*m;
     118             :     }
     119             : };
     120             : template< typename T, typename M > struct FastIntegerOutputMaskFunctor<T,M,false> :
     121             :    public MaskFunctorBase<T,M>
     122             : {
     123             :     /// Specialization, only valid if mask can only attain 0 or 1
     124  1195900797 :     T operator()( T v1, M m, T v2 ) const
     125             :     {
     126             :         OSL_ASSERT(m<=1);
     127             : 
     128  1195900797 :         return v1*m + v2*static_cast<M>(1-m);
     129             :     }
     130             : };
     131             : 
     132             : 
     133             : 
     134             : /** Split a pair value from a JoinImageAccessorAdapter into its
     135             :     individual values, and pass it on to a ternary functor
     136             : 
     137             :     This wrapper is an adaptable binary functor, and can thus be used
     138             :     with a BinarySetterFunctionAccessorAdapter. Useful e.g. for
     139             :     out-of-image alpha channel, or a masked image.
     140             : 
     141             :     @tpl Functor
     142             :     An adaptable ternary functor (as can e.g. be passed to the
     143             :     TernarySetterFunctionAccessorAdapter)
     144             :  */
     145             : template< typename Functor > struct BinaryFunctorSplittingWrapper :
     146             :         public std::binary_function<typename Functor::first_argument_type,
     147             :                                     std::pair<typename Functor::third_argument_type,
     148             :                                               typename Functor::second_argument_type>,
     149             :                                     typename Functor::result_type>
     150             : {
     151             : #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
     152             : // making all members public, if no member template friends
     153             : private:
     154             :     template<class A> friend struct BinaryFunctorSplittingWrapper;
     155             : #endif
     156             :     Functor maFunctor;
     157             : 
     158             : public:
     159       12352 :     BinaryFunctorSplittingWrapper() : maFunctor() {}
     160             : 
     161             :     template< class A > explicit
     162             :     BinaryFunctorSplittingWrapper(
     163             :         BinaryFunctorSplittingWrapper<A> const& src ) : maFunctor(src.maFunctor) {}
     164             : 
     165             :     template< class F > explicit
     166             :     BinaryFunctorSplittingWrapper( F const& func ) : maFunctor(func) {}
     167             : 
     168    67135968 :     typename Functor::result_type operator()(
     169             :         typename Functor::first_argument_type                      v1,
     170             :         std::pair< typename Functor::third_argument_type,
     171             :                    typename Functor::second_argument_type > const& v2 ) const
     172             :     {
     173    67135968 :         return maFunctor( v1, v2.second, v2.first );
     174             :     }
     175             : };
     176             : 
     177             : } // namespace basebmp
     178             : 
     179             : #endif /* INCLUDED_BASEBMP_ACCESSORFUNCTORS_HXX */
     180             : 
     181             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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