222 lines
9.2 KiB
C++
222 lines
9.2 KiB
C++
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/*************************************************************************
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*
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* $RCSfile: interpolation.hxx,v $
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*
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* $Revision: 1.2 $
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*
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* last change: $Author: kz $ $Date: 2005-01-21 16:59:59 $
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*
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* The Contents of this file are made available subject to the terms of
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* either of the following licenses
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*
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* - GNU Lesser General Public License Version 2.1
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* - Sun Industry Standards Source License Version 1.1
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*
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* Sun Microsystems Inc., October, 2000
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2000 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*
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* Sun Industry Standards Source License Version 1.1
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* =================================================
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* The contents of this file are subject to the Sun Industry Standards
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* Source License Version 1.1 (the "License"); You may not use this file
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* except in compliance with the License. You may obtain a copy of the
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* License at http://www.openoffice.org/license.html.
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*
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* Software provided under this License is provided on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
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* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
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* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
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* See the License for the specific provisions governing your rights and
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* obligations concerning the Software.
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*
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* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
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*
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* Copyright: 2000 by Sun Microsystems, Inc.
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*
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* All Rights Reserved.
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*
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* Contributor(s): _______________________________________
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*
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*
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************************************************************************/
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#ifndef _SLIDESHOW_INTERPOLATION_HXX
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#define _SLIDESHOW_INTERPOLATION_HXX
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#include <lerp.hxx>
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namespace presentation
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{
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namespace internal
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{
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// Interpolator specializations
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// ============================
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// NOTE: generic lerp is included from lerp.hxx. Following
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// are some specializations for various
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// not-straight-forward-interpolatable types
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/// Specialization for RGBColor, to employ color-specific interpolator
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template<> RGBColor lerp< RGBColor >( const RGBColor& rFrom,
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const RGBColor& rTo,
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double t )
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{
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return interpolate( rFrom, rTo, t );
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}
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/// Specialization also for sal_Int16, although this code should not be called
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template<> sal_Int16 lerp< sal_Int16 >( const sal_Int16&,
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const sal_Int16& rTo,
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double )
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{
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OSL_ENSURE( false,
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"lerp<sal_Int16> called" );
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return rTo;
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}
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/// Specialization also for string, although this code should not be called
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template<> ::rtl::OUString lerp< ::rtl::OUString >( const ::rtl::OUString&,
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const ::rtl::OUString& rTo,
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double )
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{
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OSL_ENSURE( false,
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"lerp<::rtl::OUString> called" );
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return rTo;
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}
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/// Specialization also for bool, although this code should not be called
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template<> bool lerp< bool >( const bool&,
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const bool& rTo,
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double )
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{
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OSL_ENSURE( false,
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"lerp<bool> called" );
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return rTo;
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}
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template< typename ValueType > struct Interpolator
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{
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ValueType operator()( const ValueType& rFrom,
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const ValueType& rTo,
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double t ) const
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{
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return lerp( rFrom, rTo, t );
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}
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};
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/// Specialization for HSLColor, to employ color-specific interpolator
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template<> struct Interpolator< HSLColor >
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{
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Interpolator( bool bCCW ) :
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mbCCW( bCCW )
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{
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}
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HSLColor operator()( const HSLColor& rFrom,
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const HSLColor& rTo,
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double t ) const
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{
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return interpolate( rFrom, rTo, t, mbCCW );
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}
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private:
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/// When true: interpolate counter-clockwise
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const bool mbCCW;
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};
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/** Generic linear interpolator
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@tpl ValueType
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Must have operator+ and operator* defined, and should
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have value semantics.
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@param rInterpolator
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Interpolator to use for lerp
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@param nFrame
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Must be in the [0,nTotalFrames) range
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@param nTotalFrames
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Total number of frames. Should be greater than zero.
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*/
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template< typename ValueType > ValueType lerp( const Interpolator< ValueType >& rInterpolator,
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const ValueType& rFrom,
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const ValueType& rTo,
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sal_uInt32 nFrame,
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::std::size_t nTotalFrames )
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{
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// TODO(P1): There's a nice HAKMEM trick for that
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// nTotalFrames > 1 condition below
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// for 1 and 0 frame animations, always take end value
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const double nFraction( nTotalFrames > 1 ? (double)nFrame/(nTotalFrames-1) : 1.0 );
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return rInterpolator( rFrom, rTo, nFraction );
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}
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/// Specialization for non-interpolatable constants/enums
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template<> sal_Int16 lerp< sal_Int16 >( const Interpolator< sal_Int16 >& rInterpolator,
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const sal_Int16& rFrom,
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const sal_Int16& rTo,
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sal_uInt32 nFrame,
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::std::size_t nTotalFrames )
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{
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// until one half of the total frames are over, take from value.
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// after that, take to value.
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// For nFrames not divisable by 2, we prefer to over from, which
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// also neatly yields to for 1 frame activities
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return nFrame < nTotalFrames/2 ? rFrom : rTo;
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}
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/// Specialization for non-interpolatable strings
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template<> ::rtl::OUString lerp< ::rtl::OUString >( const Interpolator< ::rtl::OUString >& rInterpolator,
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const ::rtl::OUString& rFrom,
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const ::rtl::OUString& rTo,
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sal_uInt32 nFrame,
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::std::size_t nTotalFrames )
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{
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// until one half of the total frames are over, take from value.
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// after that, take to value.
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// For nFrames not divisable by 2, we prefer to over from, which
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// also neatly yields to for 1 frame activities
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return nFrame < nTotalFrames/2 ? rFrom : rTo;
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}
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/// Specialization for non-interpolatable bools
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template<> bool lerp< bool >( const Interpolator< bool >& rInterpolator,
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const bool& bFrom,
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const bool& bTo,
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sal_uInt32 nFrame,
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::std::size_t nTotalFrames )
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{
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// until one half of the total frames are over, take from value.
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// after that, take to value.
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// For nFrames not divisable by 2, we prefer to over from, which
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// also neatly yields to for 1 frame activities
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return nFrame < nTotalFrames/2 ? bFrom : bTo;
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}
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}
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}
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#endif /* _SLIDESHOW_INTERPOLATION_HXX */
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