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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_INTERPOLATION_HXX
#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_INTERPOLATION_HXX
#include <basegfx/tools/lerp.hxx>
namespace basegfx
{
namespace tools
{
// Interpolator specializations
// ============================
// NOTE: generic lerp is included from lerp.hxx. Following
// are some specializations for various
// not-straight-forward-interpolatable types
/// Specialization for RGBColor, to employ color-specific interpolator
template<> ::slideshow::internal::RGBColor lerp< ::slideshow::internal::RGBColor >(
const ::slideshow::internal::RGBColor& rFrom,
const ::slideshow::internal::RGBColor& rTo,
double t )
{
return interpolate( rFrom, rTo, t );
}
/// Specialization also for sal_Int16, although this code should not be called
template<> sal_Int16 lerp< sal_Int16 >( const sal_Int16&,
const sal_Int16& rTo,
double )
{
OSL_FAIL( "lerp<sal_Int16> called" );
return rTo;
}
/// Specialization also for string, although this code should not be called
template<> OUString lerp< OUString >( const OUString&,
const OUString& rTo,
double )
{
OSL_FAIL( "lerp<OUString> called" );
return rTo;
}
/// Specialization also for bool, although this code should not be called
template<> bool lerp< bool >( const bool&,
const bool& rTo,
double )
{
OSL_FAIL( "lerp<bool> called" );
return rTo;
}
}
}
namespace slideshow
{
namespace internal
{
template< typename ValueType > struct Interpolator
{
ValueType operator()( const ValueType& rFrom,
const ValueType& rTo,
double t ) const
{
return basegfx::tools::lerp( rFrom, rTo, t );
}
};
/// Specialization for HSLColor, to employ color-specific interpolator
template<> struct Interpolator< HSLColor >
{
Interpolator( bool bCCW ) :
mbCCW( bCCW )
{
}
HSLColor operator()( const HSLColor& rFrom,
const HSLColor& rTo,
double t ) const
{
return interpolate( rFrom, rTo, t, mbCCW );
}
private:
/// When true: interpolate counter-clockwise
const bool mbCCW;
};
/** Generic linear interpolator
@tpl ValueType
Must have operator+ and operator* defined, and should
have value semantics.
@param rInterpolator
Interpolator to use for lerp
@param nFrame
Must be in the [0,nTotalFrames) range
@param nTotalFrames
Total number of frames. Should be greater than zero.
*/
template< typename ValueType > ValueType lerp( const Interpolator< ValueType >& rInterpolator,
const ValueType& rFrom,
const ValueType& rTo,
sal_uInt32 nFrame,
::std::size_t nTotalFrames )
{
// TODO(P1): There's a nice HAKMEM trick for that
// nTotalFrames > 1 condition below
// for 1 and 0 frame animations, always take end value
const double nFraction( nTotalFrames > 1 ? double(nFrame)/(nTotalFrames-1) : 1.0 );
return rInterpolator( rFrom, rTo, nFraction );
}
/// Specialization for non-interpolatable constants/enums
template<> sal_Int16 lerp< sal_Int16 >( const Interpolator< sal_Int16 >& /*rInterpolator*/,
const sal_Int16& rFrom,
const sal_Int16& rTo,
sal_uInt32 nFrame,
::std::size_t nTotalFrames )
{
// until one half of the total frames are over, take from value.
// after that, take to value.
// For nFrames not divisable by 2, we prefer to over from, which
// also neatly yields to for 1 frame activities
return nFrame < nTotalFrames/2 ? rFrom : rTo;
}
/// Specialization for non-interpolatable strings
template<> OUString lerp< OUString >( const Interpolator< OUString >& /*rInterpolator*/,
const OUString& rFrom,
const OUString& rTo,
sal_uInt32 nFrame,
::std::size_t nTotalFrames )
{
// until one half of the total frames are over, take from value.
// after that, take to value.
// For nFrames not divisable by 2, we prefer to over from, which
// also neatly yields to for 1 frame activities
return nFrame < nTotalFrames/2 ? rFrom : rTo;
}
/// Specialization for non-interpolatable bools
template<> bool lerp< bool >( const Interpolator< bool >& /*rInterpolator*/,
const bool& bFrom,
const bool& bTo,
sal_uInt32 nFrame,
::std::size_t nTotalFrames )
{
// until one half of the total frames are over, take from value.
// after that, take to value.
// For nFrames not divisable by 2, we prefer to over from, which
// also neatly yields to for 1 frame activities
return nFrame < nTotalFrames/2 ? bFrom : bTo;
}
}
}
#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_INTERPOLATION_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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