annotate data/model/PowerOfTwoZoomConstraint.cpp @ 1520:954d0cf29ca7 import-audio-data

Switch the normalisation option in WritableWaveFileModel from normalising on read to normalising on write, so that the saved file is already normalised and therefore can be read again without having to remember to normalise it

/* -*- 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;
}