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Diffstat (limited to 'slideshow/source/engine/activities/interpolation.hxx')
| -rw-r--r-- | slideshow/source/engine/activities/interpolation.hxx | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/slideshow/source/engine/activities/interpolation.hxx b/slideshow/source/engine/activities/interpolation.hxx new file mode 100644 index 000000000000..9409965c8846 --- /dev/null +++ b/slideshow/source/engine/activities/interpolation.hxx @@ -0,0 +1,194 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#ifndef INCLUDED_SLIDESHOW_INTERPOLATION_HXX +#define INCLUDED_SLIDESHOW_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_ENSURE( false, + "lerp<sal_Int16> called" ); + return rTo; + } + + /// Specialization also for string, although this code should not be called + template<> ::rtl::OUString lerp< ::rtl::OUString >( const ::rtl::OUString&, + const ::rtl::OUString& rTo, + double ) + { + OSL_ENSURE( false, + "lerp<::rtl::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_ENSURE( false, + "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<> ::rtl::OUString lerp< ::rtl::OUString >( const Interpolator< ::rtl::OUString >& /*rInterpolator*/, + const ::rtl::OUString& rFrom, + const ::rtl::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_INTERPOLATION_HXX */ |