LCOV - code coverage report
Current view: top level - slideshow/source/engine/activities - interpolation.hxx (source / functions) Hit Total Coverage
Test: commit e02a6cb2c3e2b23b203b422e4e0680877f232636 Lines: 0 24 0.0 %
Date: 2014-04-14 Functions: 0 19 0.0 %
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_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<> OUString lerp< OUString >( const OUString&,
      56             :                                                             const OUString&  rTo,
      57             :                                                             double                       )
      58             :         {
      59             :             OSL_FAIL( "lerp<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<> OUString lerp< OUString >( const Interpolator< OUString >&  /*rInterpolator*/,
     155             :                                                             const OUString&                  rFrom,
     156             :                                                             const 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: */

Generated by: LCOV version 1.10