mirror of
https://github.com/clementine-player/Clementine
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50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
/*
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* Chromaprint -- Audio fingerprinting toolkit
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* Copyright (C) 2010 Lukas Lalinsky <lalinsky@gmail.com>
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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 as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#include "integral_image.h"
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using namespace std;
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using namespace Chromaprint;
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void IntegralImage::Transform()
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{
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int num_rows = m_image->NumRows();
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int num_columns = m_image->NumColumns();
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double *current = m_image->Row(0) + 1;
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double *last = m_image->Row(0);
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for (int m = 1; m < num_columns; m++) {
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// First column - add value on top
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*current = current[0] + current[-1];
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++current;
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}
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for (int n = 1; n < num_rows; n++) {
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// First row - add value on left
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*current = current[0] + last[0];
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++current;
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++last;
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// Add values on left, up and up-left
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for (int m = 1; m < num_columns; m++) {
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*current = current[0] + current[-1] + last[0] - last[-1];
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++current;
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++last;
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}
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}
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}
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