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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006 Chris Cannam.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "PowerOfTwoZoomConstraint.h"
int
PowerOfTwoZoomConstraint::getNearestBlockSize(int req,
RoundingDirection dir) const
{
int result = 0;
for (int bs = 1; ; bs *= 2) {
if (bs >= req) {
if (dir == RoundNearest) {
if (bs - req < req - bs/2) {
result = bs;
break;
} else {
result = bs/2;
break;
}
} else if (dir == RoundDown) {
result = bs/2;
break;
} else {
result = bs;
break;
}
}
}
if (result > getMaxZoomLevel()) result = getMaxZoomLevel();
return result;
}
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