view data/model/Dense3DModelPeakCache.h @ 1752:6d09d68165a4 by-id

Further review of ById: make IDs only available when adding a model to the ById store, not by querying the item directly. This means any id encountered in the wild must have been added to the store at some point (even if later released), which simplifies reasoning about lifecycles

/* -*- 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(ModelId source, // a DenseThreeDimensionalModel
                          int columnsPerPeak);
    ~Dense3DModelPeakCache();

    bool isOK() const override {
        auto source = ModelById::get(m_source);
        return source && source->isOK(); 
    }

    sv_samplerate_t getSampleRate() const override {
        auto source = ModelById::get(m_source);
        return source ? source->getSampleRate() : 0;
    }

    sv_frame_t getStartFrame() const override {
        auto source = ModelById::get(m_source);
        return source ? source->getStartFrame() : 0;
    }

    sv_frame_t getTrueEndFrame() const override {
        auto source = ModelById::get(m_source);
        return source ? source->getTrueEndFrame() : 0;
    }

    int getResolution() const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        return source ? source->getResolution() * m_columnsPerPeak : 1;
    }

    virtual int getColumnsPerPeak() const {
        return m_columnsPerPeak;
    }
    
    int getWidth() const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        if (!source) return 0;
        int sourceWidth = source->getWidth();
        if ((sourceWidth % m_columnsPerPeak) == 0) {
            return sourceWidth / m_columnsPerPeak;
        } else {
            return sourceWidth / m_columnsPerPeak + 1;
        }
    }

    int getHeight() const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        return source ? source->getHeight() : 0;
    }

    float getMinimumLevel() const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        return source ? source->getMinimumLevel() : 0.f;
    }

    float getMaximumLevel() const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        return source ? source->getMaximumLevel() : 1.f;
    }

    /**
     * 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.
     */
    Column getColumn(int col) const override;

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

    QString getBinName(int n) const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        return source ? source->getBinName(n) : "";
    }

    bool shouldUseLogValueScale() const override {
        auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
        return source ? source->shouldUseLogValueScale() : false;
    }

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

    int getCompletion() const override {
        auto source = ModelById::get(m_source);
        return source ? source->getCompletion() : 100;
    }

    QString toDelimitedDataString(QString, DataExportOptions,
                                  sv_frame_t, sv_frame_t) const override {
        return "";
    }

protected slots:
    void sourceModelChanged(ModelId);

private:
    ModelId m_source;
    mutable std::unique_ptr<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