view data/model/Dense3DModelPeakCache.h @ 1455:ec9e65fcf749

The use of the begin/end pairs here just seems to cause too many rows to be deleted (from the visual representation, not the underlying model). Things apparently work better if we just modify the underlying model and let the change signals percolate back up again. To that end, update the change handlers so as to cover their proper ranges with dataChanged signals.

/* -*- 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 2009 QMUL.
    
    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 DENSE_3D_MODEL_PEAK_CACHE_H
#define DENSE_3D_MODEL_PEAK_CACHE_H

#include "DenseThreeDimensionalModel.h"
#include "EditableDenseThreeDimensionalModel.h"

class Dense3DModelPeakCache : public DenseThreeDimensionalModel
{
    Q_OBJECT

public:
    Dense3DModelPeakCache(const DenseThreeDimensionalModel *source,
                          int columnsPerPeak);
    ~Dense3DModelPeakCache();

    virtual bool isOK() const {
        return m_source && m_source->isOK(); 
    }

    virtual sv_samplerate_t getSampleRate() const {
        return m_source->getSampleRate();
    }

    virtual sv_frame_t getStartFrame() const {
        return m_source->getStartFrame();
    }

    virtual sv_frame_t getEndFrame() const {
        return m_source->getEndFrame();
    }

    virtual int getResolution() const {
        return m_source->getResolution() * m_columnsPerPeak;
    }

    virtual int getColumnsPerPeak() const {
        return m_columnsPerPeak;
    }
    
    virtual int getWidth() const {
        int sourceWidth = m_source->getWidth();
        if ((sourceWidth % m_columnsPerPeak) == 0) {
            return sourceWidth / m_columnsPerPeak;
        } else {
            return sourceWidth / m_columnsPerPeak + 1;
        }
    }

    virtual int getHeight() const {
        return m_source->getHeight();
    }

    virtual float getMinimumLevel() const {
        return m_source->getMinimumLevel();
    }

    virtual float getMaximumLevel() const {
        return m_source->getMaximumLevel();
    }

    /**
     * Retrieve the peaks column at peak-cache column number col. This
     * will consist of the peak values in the underlying model from
     * columns (col * getColumnsPerPeak()) to ((col+1) *
     * getColumnsPerPeak() - 1) inclusive.
     */
    virtual Column getColumn(int col) const;

    virtual float getValueAt(int col, int n) const;

    virtual QString getBinName(int n) const {
        return m_source->getBinName(n);
    }

    virtual bool shouldUseLogValueScale() const {
        return m_source->shouldUseLogValueScale();
    }

    QString getTypeName() const { return tr("Dense 3-D Peak Cache"); }

    virtual int getCompletion() const {
        return m_source->getCompletion();
    }

protected slots:
    void sourceModelChanged();
    void sourceModelAboutToBeDeleted();

private:
    const DenseThreeDimensionalModel *m_source;
    mutable EditableDenseThreeDimensionalModel *m_cache;
    mutable std::vector<bool> m_coverage; // must be bool, for space efficiency
                                          // (vector of bool uses 1-bit elements)
    int m_columnsPerPeak;

    bool haveColumn(int column) const;
    void fillColumn(int column) const;
};


#endif