WaveformLayer.h

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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 and 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 _WAVEFORM_LAYER_H_
#define _WAVEFORM_LAYER_H_

#include <QRect>

#include "SingleColourLayer.h"

#include "data/model/RangeSummarisableTimeValueModel.h"

class View;
class QPainter;
class QPixmap;

class WaveformLayer : public SingleColourLayer
{
    Q_OBJECT

public:
    WaveformLayer();
    ~WaveformLayer();

    virtual const ZoomConstraint *getZoomConstraint() const {
        return m_model ? m_model->getZoomConstraint() : 0;
    }
    virtual const Model *getModel() const { return m_model; }
    virtual void paint(View *v, QPainter &paint, QRect rect) const;

    virtual QString getFeatureDescription(View *v, QPoint &) const;

    virtual ColourSignificance getLayerColourSignificance() const {
        return ColourAndBackgroundSignificant;
    }

    virtual int getVerticalScaleWidth(View *v, QPainter &) const;
    virtual void paintVerticalScale(View *v, QPainter &paint, QRect rect) const;

    void setModel(const RangeSummarisableTimeValueModel *model);

    virtual PropertyList getProperties() const;
    virtual QString getPropertyLabel(const PropertyName &) const;
    virtual QString getPropertyIconName(const PropertyName &) const;
    virtual PropertyType getPropertyType(const PropertyName &) const;
    virtual QString getPropertyGroupName(const PropertyName &) const;
    virtual int getPropertyRangeAndValue(const PropertyName &,
                                         int *min, int *max, int *deflt) const;
    virtual QString getPropertyValueLabel(const PropertyName &,
                                          int value) const;
    virtual RangeMapper *getNewPropertyRangeMapper(const PropertyName &) const;
    virtual void setProperty(const PropertyName &, int value);

    void setGain(float gain);
    float getGain() const { return m_gain; }

    void setAutoNormalize(bool);
    bool getAutoNormalize() const { return m_autoNormalize; }

    void setShowMeans(bool);
    bool getShowMeans() const { return m_showMeans; }

    void setUseGreyscale(bool);
    bool getUseGreyscale() const { return m_greyscale; }


    enum ChannelMode { SeparateChannels, MixChannels, MergeChannels };

    void setChannelMode(ChannelMode);
    ChannelMode getChannelMode() const { return m_channelMode; }


    void setChannel(int);
    int getChannel() const { return m_channel; }


    enum Scale { LinearScale, MeterScale, dBScale };

    void setScale(Scale);
    Scale getScale() const { return m_scale; }

    void setAggressiveCacheing(bool);
    bool getAggressiveCacheing() const { return m_aggressive; }

    virtual bool isLayerScrollable(const View *) const;

    virtual int getCompletion(View *) const;

    virtual bool getValueExtents(float &min, float &max,
                                 bool &log, QString &unit) const;

    virtual bool getYScaleValue(const View *v, int y,
                                float &value, QString &unit) const;
    
    virtual bool getYScaleDifference(const View *v, int y0, int y1,
                                     float &diff, QString &unit) const;

    virtual void toXml(QTextStream &stream, QString indent = "",
                       QString extraAttributes = "") const;

    virtual void setProperties(const QXmlAttributes &attributes);

    virtual int getVerticalZoomSteps(int &defaultStep) const;
    virtual int getCurrentVerticalZoomStep() const;
    virtual void setVerticalZoomStep(int);

protected:
    int dBscale(float sample, int m) const;

    const RangeSummarisableTimeValueModel *m_model; // I do not own this

    size_t getChannelArrangement(size_t &min, size_t &max,
                                 bool &merging, bool &mixing) const;

    int getYForValue(const View *v, float value, size_t channel) const;

    float getValueForY(const View *v, int y, size_t &channel) const;

    bool getSourceFramesForX(View *v, int x, size_t modelZoomLevel,
                             size_t &f0, size_t &f1) const;

    float getNormalizeGain(View *v, int channel) const;

    virtual void flagBaseColourChanged() { m_cacheValid = false; }

    float        m_gain;
    bool         m_autoNormalize;
    bool         m_showMeans;
    bool         m_greyscale;
    ChannelMode  m_channelMode;
    int          m_channel;
    Scale        m_scale;
    bool         m_aggressive;

    mutable std::vector<float> m_effectiveGains;

    mutable QPixmap *m_cache;
    mutable bool m_cacheValid;
    mutable int m_cacheZoomLevel;
};

#endif

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