view layer/ImageLayer.h @ 1127:9fb8dfd7ce4c spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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 2006-2007 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 _IMAGE_LAYER_H_
#define _IMAGE_LAYER_H_

#include "Layer.h"
#include "data/model/ImageModel.h"

#include <QObject>
#include <QColor>
#include <QImage>
#include <QMutex>

#include <map>

class View;
class QPainter;
class FileSource;

class ImageLayer : public Layer
{
    Q_OBJECT

public:
    ImageLayer();
    virtual ~ImageLayer();

    virtual void paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const;

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

    virtual bool snapToFeatureFrame(LayerGeometryProvider *v, sv_frame_t &frame,
				    int &resolution,
				    SnapType snap) const;

    virtual void drawStart(LayerGeometryProvider *v, QMouseEvent *);
    virtual void drawDrag(LayerGeometryProvider *v, QMouseEvent *);
    virtual void drawEnd(LayerGeometryProvider *v, QMouseEvent *);

    virtual void editStart(LayerGeometryProvider *v, QMouseEvent *);
    virtual void editDrag(LayerGeometryProvider *v, QMouseEvent *);
    virtual void editEnd(LayerGeometryProvider *v, QMouseEvent *);

    virtual void moveSelection(Selection s, sv_frame_t newStartFrame);
    virtual void resizeSelection(Selection s, Selection newSize);
    virtual void deleteSelection(Selection s);

    virtual void copy(LayerGeometryProvider *v, Selection s, Clipboard &to);
    virtual bool paste(LayerGeometryProvider *v, const Clipboard &from, sv_frame_t frameOffset,
                       bool interactive);

    virtual bool editOpen(LayerGeometryProvider *, QMouseEvent *); // on double-click

    virtual const Model *getModel() const { return m_model; }
    void setModel(ImageModel *model);

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

    virtual ColourSignificance getLayerColourSignificance() const {
        return ColourAbsent;
    }

    virtual bool isLayerScrollable(const LayerGeometryProvider *v) const;

    virtual bool isLayerEditable() const { return true; }

    virtual int getCompletion(LayerGeometryProvider *) const { return m_model->getCompletion(); }

    virtual bool getValueExtents(double &min, double &max,
                                 bool &logarithmic, QString &unit) const;

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

    virtual int getVerticalScaleWidth(LayerGeometryProvider *, bool, QPainter &) const { return 0; }

    virtual void setLayerDormant(const LayerGeometryProvider *v, bool dormant);

    void setProperties(const QXmlAttributes &attributes);

    virtual bool addImage(sv_frame_t frame, QString url); // using a command

protected slots:
    void checkAddSources();
    void fileSourceReady();

protected:
    ImageModel::PointList getLocalPoints(LayerGeometryProvider *v, int x, int y) const;

    bool getImageOriginalSize(QString name, QSize &size) const;
    QImage getImage(LayerGeometryProvider *v, QString name, QSize maxSize) const;

    void drawImage(LayerGeometryProvider *v, QPainter &paint, const ImageModel::Point &p,
                   int x, int nx) const;

    //!!! how to reap no-longer-used images?

    typedef std::map<QString, QImage> ImageMap;
    typedef std::map<const LayerGeometryProvider *, ImageMap> ViewImageMap;
    typedef std::map<QString, FileSource *> FileSourceMap;

    static ImageMap m_images;
    static QMutex m_imageMapMutex;
    mutable ViewImageMap m_scaled;
    mutable FileSourceMap m_fileSources;

    QString getLocalFilename(QString img) const;
    void checkAddSource(QString img) const;

    ImageModel *m_model;
    bool m_editing;
    QPoint m_editOrigin;
    ImageModel::Point m_originalPoint;
    ImageModel::Point m_editingPoint;
    ImageModel::EditCommand *m_editingCommand;

    void finish(ImageModel::EditCommand *command) {
        Command *c = command->finish();
        if (c) CommandHistory::getInstance()->addCommand(c, false);
    }
};

#endif