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Diffstat (limited to 'vcl/quartz/salmathutils.cxx')
| -rw-r--r-- | vcl/quartz/salmathutils.cxx | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/vcl/quartz/salmathutils.cxx b/vcl/quartz/salmathutils.cxx new file mode 100644 index 000000000000..e1222aa63061 --- /dev/null +++ b/vcl/quartz/salmathutils.cxx @@ -0,0 +1,154 @@ +/* -*- 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 . + */ + + +#include "quartz/salmathutils.hxx" + +#include <stdlib.h> + +// ======================================================================= + +// ======================================================================= + +#define Swap( x, y ) { x ^= y; y ^= x; x ^= y; } + +// ======================================================================= + +// ======================================================================= + +// Storage free swapping using XOR + +void CSwap ( char &rX, char &rY ) +{ + Swap( rX, rY ); +} // CSwap + +// ----------------------------------------------------------------------- + +// Storage free swapping using XOR + +void UCSwap ( unsigned char &rX, unsigned char &rY ) +{ + Swap( rX, rY ); +} // UCSwap + +// ----------------------------------------------------------------------- + +// Storage free swapping using XOR + +void SSwap ( short &rX, short &rY ) +{ + Swap( rX, rY ); +} // SSwap + +// ----------------------------------------------------------------------- + +// Storage free swapping using XOR + +void USSwap ( unsigned short &rX, unsigned short &rY ) +{ + Swap( rX, rY ); +} // USSwap + +// ----------------------------------------------------------------------- + +// Storage free swapping using XOR + +void LSwap ( long &rX, long &rY ) +{ + Swap( rX, rY ); +} // LSwap + +// ----------------------------------------------------------------------- + +// Storage free swapping using XOR + +void ULSwap ( unsigned long &rX, unsigned long &rY ) +{ + Swap( rX, rY ); +} // ULSwap + +// ======================================================================= + +// ======================================================================= + +// ----------------------------------------------------------------------- +// +// This way of measuring distance is also called the "Manhattan distance." +// Manhattan distance takes advantage of the fact that the sum of the +// lengths of the three components of a 3D vector is a rough approxima- +// tion of the vector's length. +// +// ----------------------------------------------------------------------- + +unsigned long Euclidian2Norm ( const LRectCoorVector pVec ) +{ + unsigned long ndist = 0; + + if ( pVec ) + { + long nDX = 0; + long nDY = 0; + long nDZ = 0; + unsigned long nMax = 0; + unsigned long nMed = 0; + unsigned long nMin = 0; + + // Find |x'-x|, |y'-y|, and |z'-z| from (x,y,z) and (x',y',z') + + nDX = pVec[1].x - pVec[0].x; + nDY = pVec[1].y - pVec[0].y; + nDZ = pVec[1].z - pVec[0].z; + + nMax = (unsigned long)abs( nDX ); + nMed = (unsigned long)abs( nDY ); + nMin = (unsigned long)abs( nDZ ); + + // Sort them (3 compares, 0-3 swaps) + + if ( nMax < nMed ) + { + Swap( nMax, nMed ); + } // if + + if ( nMax < nMin ) + { + Swap( nMax, nMin ); + } // if + + // Approximate Euclidian distance: + // + // d = max + (11/32)*med + (1/4)*min + // + // with +/- 8% error, where the exact formulae for d is + // + // || (x',y',z') - (x,y,z) || = { |x'-x|^2 + |y'-y|^2 + |z'-z|^2 }^(1/2) + + ndist = nMax + ( nMin >> 2UL ) + + ( ( ( nMed << 3UL ) + ( nMed << 1UL ) + nMed ) >> 5UL ); + } // if + + return ndist; +} // RGBDistance + +// ======================================================================= + +// ======================================================================= + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |