LCOV - code coverage report
Current view: top level - basebmp/inc/basebmp - accessorfunctors.hxx (source / functions) Hit Total Coverage
Test: libreoffice_filtered.info Lines: 8 8 100.0 %
Date: 2012-08-25 Functions: 11 13 84.6 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 4 4 100.0 %

           Branch data     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                 :   31953048 :     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                 :  226345720 :     T operator()( T v1, M m, T v2 ) const
      61                 :            :     {
      62 [ +  + ][ +  + ]:  226345720 :         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*(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*(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*(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                 :      13804 :     T operator()( T v1, M m, T v2 ) const
     125                 :            :     {
     126                 :            :         OSL_ASSERT(m<=1);
     127                 :            : 
     128                 :      13804 :         return v1*m + v2*(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                 :       3107 :     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                 :   25343542 :     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                 :   25343542 :         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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