LCOV - code coverage report
Current view: top level - slideshow/source/engine/activities - interpolation.hxx (source / functions) Hit Total Coverage
Test: libreoffice_filtered.info Lines: 0 24 0.0 %
Date: 2012-08-25 Functions: 0 19 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 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_SLIDESHOW_INTERPOLATION_HXX
      21                 :            : #define INCLUDED_SLIDESHOW_INTERPOLATION_HXX
      22                 :            : 
      23                 :            : #include <basegfx/tools/lerp.hxx>
      24                 :            : 
      25                 :            : namespace basegfx
      26                 :            : {
      27                 :            :     namespace tools
      28                 :            :     {
      29                 :            :         // Interpolator specializations
      30                 :            :         // ============================
      31                 :            : 
      32                 :            :         // NOTE: generic lerp is included from lerp.hxx. Following
      33                 :            :         // are some specializations for various
      34                 :            :         // not-straight-forward-interpolatable types
      35                 :            : 
      36                 :            :         /// Specialization for RGBColor, to employ color-specific interpolator
      37                 :          0 :         template<> ::slideshow::internal::RGBColor lerp< ::slideshow::internal::RGBColor >(
      38                 :            :             const ::slideshow::internal::RGBColor& rFrom,
      39                 :            :             const ::slideshow::internal::RGBColor& rTo,
      40                 :            :             double                                 t     )
      41                 :            :         {
      42                 :          0 :             return interpolate( rFrom, rTo, t );
      43                 :            :         }
      44                 :            : 
      45                 :            :         /// Specialization also for sal_Int16, although this code should not be called
      46                 :          0 :         template<> sal_Int16 lerp< sal_Int16 >( const sal_Int16&,
      47                 :            :                                                 const sal_Int16&    rTo,
      48                 :            :                                                 double                     )
      49                 :            :         {
      50                 :            :             OSL_FAIL( "lerp<sal_Int16> called" );
      51                 :          0 :             return rTo;
      52                 :            :         }
      53                 :            : 
      54                 :            :         /// Specialization also for string, although this code should not be called
      55                 :          0 :         template<> ::rtl::OUString lerp< ::rtl::OUString >( const ::rtl::OUString&,
      56                 :            :                                                             const ::rtl::OUString&  rTo,
      57                 :            :                                                             double                       )
      58                 :            :         {
      59                 :            :             OSL_FAIL( "lerp<::rtl::OUString> called" );
      60                 :          0 :             return rTo;
      61                 :            :         }
      62                 :            : 
      63                 :            :         /// Specialization also for bool, although this code should not be called
      64                 :          0 :         template<> bool lerp< bool >( const bool&,
      65                 :            :                                       const bool&   rTo,
      66                 :            :                                       double             )
      67                 :            :         {
      68                 :            :             OSL_FAIL( "lerp<bool> called" );
      69                 :          0 :             return rTo;
      70                 :            :         }
      71                 :            :     }
      72                 :            : }
      73                 :            : 
      74                 :            : namespace slideshow
      75                 :            : {
      76                 :            :     namespace internal
      77                 :            :     {
      78                 :            :         template< typename ValueType > struct Interpolator
      79                 :            :         {
      80                 :          0 :             ValueType operator()( const ValueType&  rFrom,
      81                 :            :                                   const ValueType&  rTo,
      82                 :            :                                   double            t ) const
      83                 :            :             {
      84                 :          0 :                 return basegfx::tools::lerp( rFrom, rTo, t );
      85                 :            :             }
      86                 :            :         };
      87                 :            : 
      88                 :            :         /// Specialization for HSLColor, to employ color-specific interpolator
      89                 :            :         template<> struct Interpolator< HSLColor >
      90                 :            :         {
      91                 :          0 :             Interpolator( bool bCCW ) :
      92                 :          0 :                 mbCCW( bCCW )
      93                 :            :             {
      94                 :          0 :             }
      95                 :            : 
      96                 :          0 :             HSLColor operator()( const HSLColor&    rFrom,
      97                 :            :                                  const HSLColor&    rTo,
      98                 :            :                                  double             t ) const
      99                 :            :             {
     100                 :          0 :                 return interpolate( rFrom, rTo, t, mbCCW );
     101                 :            :             }
     102                 :            : 
     103                 :            :         private:
     104                 :            :             /// When true: interpolate counter-clockwise
     105                 :            :             const bool mbCCW;
     106                 :            :         };
     107                 :            : 
     108                 :            : 
     109                 :            :         /** Generic linear interpolator
     110                 :            : 
     111                 :            :             @tpl ValueType
     112                 :            :             Must have operator+ and operator* defined, and should
     113                 :            :             have value semantics.
     114                 :            : 
     115                 :            :             @param rInterpolator
     116                 :            :             Interpolator to use for lerp
     117                 :            : 
     118                 :            :             @param nFrame
     119                 :            :             Must be in the [0,nTotalFrames) range
     120                 :            : 
     121                 :            :             @param nTotalFrames
     122                 :            :             Total number of frames. Should be greater than zero.
     123                 :            :         */
     124                 :          0 :         template< typename ValueType > ValueType lerp( const Interpolator< ValueType >& rInterpolator,
     125                 :            :                                                        const ValueType&                 rFrom,
     126                 :            :                                                        const ValueType&                 rTo,
     127                 :            :                                                        sal_uInt32                       nFrame,
     128                 :            :                                                        ::std::size_t                    nTotalFrames )
     129                 :            :         {
     130                 :            :             // TODO(P1): There's a nice HAKMEM trick for that
     131                 :            :             // nTotalFrames > 1 condition below
     132                 :            : 
     133                 :            :             // for 1 and 0 frame animations, always take end value
     134                 :          0 :             const double nFraction( nTotalFrames > 1 ? double(nFrame)/(nTotalFrames-1) : 1.0 );
     135                 :            : 
     136                 :          0 :             return rInterpolator( rFrom, rTo, nFraction );
     137                 :            :         }
     138                 :            : 
     139                 :            :         /// Specialization for non-interpolatable constants/enums
     140                 :          0 :         template<> sal_Int16 lerp< sal_Int16 >( const Interpolator< sal_Int16 >&    /*rInterpolator*/,
     141                 :            :                                                 const sal_Int16&                    rFrom,
     142                 :            :                                                 const sal_Int16&                    rTo,
     143                 :            :                                                 sal_uInt32                          nFrame,
     144                 :            :                                                 ::std::size_t                       nTotalFrames )
     145                 :            :         {
     146                 :            :             // until one half of the total frames are over, take from value.
     147                 :            :             // after that, take to value.
     148                 :            :             // For nFrames not divisable by 2, we prefer to over from, which
     149                 :            :             // also neatly yields to for 1 frame activities
     150                 :          0 :             return nFrame < nTotalFrames/2 ? rFrom : rTo;
     151                 :            :         }
     152                 :            : 
     153                 :            :         /// Specialization for non-interpolatable strings
     154                 :          0 :         template<> ::rtl::OUString lerp< ::rtl::OUString >( const Interpolator< ::rtl::OUString >&  /*rInterpolator*/,
     155                 :            :                                                             const ::rtl::OUString&                  rFrom,
     156                 :            :                                                             const ::rtl::OUString&                  rTo,
     157                 :            :                                                             sal_uInt32                              nFrame,
     158                 :            :                                                             ::std::size_t                           nTotalFrames )
     159                 :            :         {
     160                 :            :             // until one half of the total frames are over, take from value.
     161                 :            :             // after that, take to value.
     162                 :            :             // For nFrames not divisable by 2, we prefer to over from, which
     163                 :            :             // also neatly yields to for 1 frame activities
     164                 :          0 :             return nFrame < nTotalFrames/2 ? rFrom : rTo;
     165                 :            :         }
     166                 :            : 
     167                 :            :         /// Specialization for non-interpolatable bools
     168                 :          0 :         template<> bool lerp< bool >( const Interpolator< bool >&   /*rInterpolator*/,
     169                 :            :                                       const bool&                   bFrom,
     170                 :            :                                       const bool&                   bTo,
     171                 :            :                                       sal_uInt32                    nFrame,
     172                 :            :                                       ::std::size_t                 nTotalFrames )
     173                 :            :         {
     174                 :            :             // until one half of the total frames are over, take from value.
     175                 :            :             // after that, take to value.
     176                 :            :             // For nFrames not divisable by 2, we prefer to over from, which
     177                 :            :             // also neatly yields to for 1 frame activities
     178                 :          0 :             return nFrame < nTotalFrames/2 ? bFrom : bTo;
     179                 :            :         }
     180                 :            :     }
     181                 :            : }
     182                 :            : 
     183                 :            : #endif /* INCLUDED_SLIDESHOW_INTERPOLATION_HXX */
     184                 :            : 
     185                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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