view data/model/PowerOfSqrtTwoZoomConstraint.h @ 1881:b504df98c3be

Ensure completion on output model is started at zero, so if it's checked before the input model has become ready and the transform has begun, it is not accidentally reported as complete (affected re-aligning models in Sonic Lineup when replacing the session)

/* -*- 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.
*/

#ifndef SV_POWER_OF_SQRT_TWO_ZOOM_CONSTRAINT_H
#define SV_POWER_OF_SQRT_TWO_ZOOM_CONSTRAINT_H

#include "base/ZoomConstraint.h"

class PowerOfSqrtTwoZoomConstraint : virtual public ZoomConstraint
{
public:
    virtual ZoomLevel getNearestZoomLevel(ZoomLevel requested,
                                          RoundingDirection dir = RoundNearest)
	const override;
	
    virtual int getMinCachePower() const { return 6; }

    virtual int getNearestBlockSize(int requestedBlockSize,
                                    int &type,
                                    int &power,
                                    RoundingDirection dir = RoundNearest)
        const;
};

#endif