view layer/ImageLayer.h @ 473:4f4f943bfdfc

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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(View *v, QPainter &paint, QRect rect) const;

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

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

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

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

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

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

    virtual bool editOpen(View *, 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 View *v) const;

    virtual bool isLayerEditable() const { return true; }

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

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

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

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

    void setProperties(const QXmlAttributes &attributes);

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

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

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

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

    void drawImage(View *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 View *, 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