view layer/ImageLayer.cpp @ 959:2633a1d73e39

Address #1214, layer import produces wrong layer type. We needed a more principled approach to making sure the format gets updated properly and the dialog elements are consistent (basically separating making the dialog elements consistent from subsequently updating the format). This change should provide that, though there may be gotchas still.

/* -*- 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.
    
    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.
*/

#include "ImageLayer.h"

#include "data/model/Model.h"
#include "base/RealTime.h"
#include "base/Profiler.h"
#include "view/View.h"

#include "data/model/ImageModel.h"
#include "data/fileio/FileSource.h"

#include "widgets/ImageDialog.h"
#include "widgets/ProgressDialog.h"

#include <QPainter>
#include <QMouseEvent>
#include <QInputDialog>
#include <QMutexLocker>
#include <QTextStream>
#include <QMessageBox>

#include <iostream>
#include <cmath>

ImageLayer::ImageMap
ImageLayer::m_images;

QMutex
ImageLayer::m_imageMapMutex;

ImageLayer::ImageLayer() :
    Layer(),
    m_model(0),
    m_editing(false),
    m_originalPoint(0, "", ""),
    m_editingPoint(0, "", ""),
    m_editingCommand(0)
{
}

ImageLayer::~ImageLayer()
{
    for (FileSourceMap::iterator i = m_fileSources.begin();
         i != m_fileSources.end(); ++i) {
        delete i->second;
    }
}

void
ImageLayer::setModel(ImageModel *model)
{
    if (m_model == model) return;
    m_model = model;

    connectSignals(m_model);

    emit modelReplaced();
}

Layer::PropertyList
ImageLayer::getProperties() const
{
    return Layer::getProperties();
}

QString
ImageLayer::getPropertyLabel(const PropertyName &) const
{
    return "";
}

Layer::PropertyType
ImageLayer::getPropertyType(const PropertyName &name) const
{
    return Layer::getPropertyType(name);
}

int
ImageLayer::getPropertyRangeAndValue(const PropertyName &name,
				    int *min, int *max, int *deflt) const
{
    return Layer::getPropertyRangeAndValue(name, min, max, deflt);
}

QString
ImageLayer::getPropertyValueLabel(const PropertyName &name,
				 int value) const
{
    return Layer::getPropertyValueLabel(name, value);
}

void
ImageLayer::setProperty(const PropertyName &name, int value)
{
    Layer::setProperty(name, value);
}

bool
ImageLayer::getValueExtents(double &, double &, bool &, QString &) const
{
    return false;
}

bool
ImageLayer::isLayerScrollable(const View *) const
{
    return true;
}


ImageModel::PointList
ImageLayer::getLocalPoints(View *v, int x, int ) const
{
    if (!m_model) return ImageModel::PointList();

//    SVDEBUG << "ImageLayer::getLocalPoints(" << x << "," << y << "):";
    const ImageModel::PointList &points(m_model->getPoints());

    ImageModel::PointList rv;

    for (ImageModel::PointList::const_iterator i = points.begin();
	 i != points.end(); ) {

	const ImageModel::Point &p(*i);
	int px = v->getXForFrame(p.frame);
        if (px > x) break;

        ++i;
        if (i != points.end()) {
            int nx = v->getXForFrame((*i).frame);
            if (nx < x) {
                // as we aim not to overlap the images, if the following
                // image begins to the left of a point then the current
                // one may be assumed to end to the left of it as well.
                continue;
            }
        }

        // this image is a candidate, test it properly

        int width = 32;
        if (m_scaled[v].find(p.image) != m_scaled[v].end()) {
            width = m_scaled[v][p.image].width();
//            SVDEBUG << "scaled width = " << width << endl;
        }

        if (x >= px && x < px + width) {
            rv.insert(p);
        }
    }

//    cerr << rv.size() << " point(s)" << endl;

    return rv;
}

QString
ImageLayer::getFeatureDescription(View *v, QPoint &pos) const
{
    int x = pos.x();

    if (!m_model || !m_model->getSampleRate()) return "";

    ImageModel::PointList points = getLocalPoints(v, x, pos.y());

    if (points.empty()) {
	if (!m_model->isReady()) {
	    return tr("In progress");
	} else {
	    return "";
	}
    }

//    int useFrame = points.begin()->frame;

//    RealTime rt = RealTime::frame2RealTime(useFrame, m_model->getSampleRate());

    QString text;
/*    
    if (points.begin()->label == "") {
	text = QString(tr("Time:\t%1\nHeight:\t%2\nLabel:\t%3"))
	    .arg(rt.toText(true).c_str())
	    .arg(points.begin()->height)
	    .arg(points.begin()->label);
    }

    pos = QPoint(v->getXForFrame(useFrame),
		 getYForHeight(v, points.begin()->height));
*/
    return text;
}


//!!! too much overlap with TimeValueLayer/TimeInstantLayer/TextLayer

bool
ImageLayer::snapToFeatureFrame(View *v, sv_frame_t &frame,
			      int &resolution,
			      SnapType snap) const
{
    if (!m_model) {
	return Layer::snapToFeatureFrame(v, frame, resolution, snap);
    }

    resolution = m_model->getResolution();
    ImageModel::PointList points;

    if (snap == SnapNeighbouring) {
	
	points = getLocalPoints(v, v->getXForFrame(frame), -1);
	if (points.empty()) return false;
	frame = points.begin()->frame;
	return true;
    }    

    points = m_model->getPoints(frame, frame);
    sv_frame_t snapped = frame;
    bool found = false;

    for (ImageModel::PointList::const_iterator i = points.begin();
	 i != points.end(); ++i) {

	if (snap == SnapRight) {

	    if (i->frame > frame) {
		snapped = i->frame;
		found = true;
		break;
	    }

	} else if (snap == SnapLeft) {

	    if (i->frame <= frame) {
		snapped = i->frame;
		found = true; // don't break, as the next may be better
	    } else {
		break;
	    }

	} else { // nearest

	    ImageModel::PointList::const_iterator j = i;
	    ++j;

	    if (j == points.end()) {

		snapped = i->frame;
		found = true;
		break;

	    } else if (j->frame >= frame) {

		if (j->frame - frame < frame - i->frame) {
		    snapped = j->frame;
		} else {
		    snapped = i->frame;
		}
		found = true;
		break;
	    }
	}
    }

    frame = snapped;
    return found;
}

void
ImageLayer::paint(View *v, QPainter &paint, QRect rect) const
{
    if (!m_model || !m_model->isOK()) return;

    sv_samplerate_t sampleRate = m_model->getSampleRate();
    if (!sampleRate) return;

//    Profiler profiler("ImageLayer::paint", true);

//    int x0 = rect.left(), x1 = rect.right();
    int x0 = 0, x1 = v->width();

    sv_frame_t frame0 = v->getFrameForX(x0);
    sv_frame_t frame1 = v->getFrameForX(x1);

    ImageModel::PointList points(m_model->getPoints(frame0, frame1));
    if (points.empty()) return;

    paint.save();
    paint.setClipRect(rect.x(), 0, rect.width(), v->height());

    QColor penColour;
    penColour = v->getForeground();

    QColor brushColour;
    brushColour = v->getBackground();

    int h, s, val;
    brushColour.getHsv(&h, &s, &val);
    brushColour.setHsv(h, s, 255, 240);

    paint.setPen(penColour);
    paint.setBrush(brushColour);
    paint.setRenderHint(QPainter::Antialiasing, true);

    for (ImageModel::PointList::const_iterator i = points.begin();
	 i != points.end(); ++i) {

	const ImageModel::Point &p(*i);

	int x = v->getXForFrame(p.frame);

        int nx = x + 2000;
        ImageModel::PointList::const_iterator j = i;
        ++j;
        if (j != points.end()) {
            int jx = v->getXForFrame(j->frame);
            if (jx < nx) nx = jx;
        }

        drawImage(v, paint, p, x, nx);
    }

    paint.setRenderHint(QPainter::Antialiasing, false);
    paint.restore();
}

void
ImageLayer::drawImage(View *v, QPainter &paint, const ImageModel::Point &p,
                      int x, int nx) const
{
    QString label = p.label;
    QString imageName = p.image;

    QImage image;
    QString additionalText;

    QSize imageSize;
    if (!getImageOriginalSize(imageName, imageSize)) {
        image = QImage(":icons/emptypage.png");
        imageSize = image.size();
        additionalText = imageName;
    }

    int topMargin = 10;
    int bottomMargin = 10;
    int spacing = 5;

    if (v->height() < 100) {
        topMargin = 5;
        bottomMargin = 5;
    }

    int maxBoxHeight = v->height() - topMargin - bottomMargin;

    int availableWidth = nx - x - 3;
    if (availableWidth < 20) availableWidth = 20;

    QRect labelRect;

    if (label != "") {

        int likelyHeight = v->height() / 4;

        int likelyWidth = // available height times image aspect
            ((maxBoxHeight - likelyHeight) * imageSize.width())
            / imageSize.height();

        if (likelyWidth > imageSize.width()) {
            likelyWidth = imageSize.width();
        }

        if (likelyWidth > availableWidth) {
            likelyWidth = availableWidth;
        }

        int singleWidth = paint.fontMetrics().width(label);
        if (singleWidth < availableWidth && singleWidth < likelyWidth * 2) {
            likelyWidth = singleWidth + 4;
        }

        labelRect = paint.fontMetrics().boundingRect
            (QRect(0, 0, likelyWidth, likelyHeight),
             Qt::AlignCenter | Qt::TextWordWrap, label);

        labelRect.setWidth(labelRect.width() + 6);
    }

    if (image.isNull()) {
        image = getImage(v, imageName,
                         QSize(availableWidth,
                               maxBoxHeight - labelRect.height()));
    }

    int boxWidth = image.width();
    if (boxWidth < labelRect.width()) {
        boxWidth = labelRect.width();
    }

    int boxHeight = image.height();
    if (label != "") {
        boxHeight += labelRect.height() + spacing;
    }

    int division = image.height();

    if (additionalText != "") {

        paint.save();

        QFont font(paint.font());
        font.setItalic(true);
        paint.setFont(font);

        int tw = paint.fontMetrics().width(additionalText);
        if (tw > availableWidth) {
            tw = availableWidth;
        }
        if (boxWidth < tw) {
            boxWidth = tw;
        }
        boxHeight += paint.fontMetrics().height();
        division += paint.fontMetrics().height();
    }                

    bottomMargin = v->height() - topMargin - boxHeight;
    if (bottomMargin > topMargin + v->height()/7) {
        topMargin += v->height()/8;
        bottomMargin -= v->height()/8;
    }

    paint.drawRect(x - 1,
                   topMargin - 1,
                   boxWidth + 2,
                   boxHeight + 2);

    int imageY;
    if (label != "") {
        imageY = topMargin + labelRect.height() + spacing;
    } else {
        imageY = topMargin;
    }

    paint.drawImage(x + (boxWidth - image.width())/2,
                    imageY,
                    image);

    if (additionalText != "") {
        paint.drawText(x,
                       imageY + image.height() + paint.fontMetrics().ascent(),
                       additionalText);
        paint.restore();
    }

    if (label != "") {
        paint.drawLine(x,
                       topMargin + labelRect.height() + spacing,
                       x + boxWidth, 
                       topMargin + labelRect.height() + spacing);

        paint.drawText(QRect(x,
                             topMargin,
                             boxWidth,
                             labelRect.height()),
                       Qt::AlignCenter | Qt::TextWordWrap,
                       label);
    }
}

void
ImageLayer::setLayerDormant(const View *v, bool dormant)
{
    if (dormant) {
        // Delete the images named in the view's scaled map from the
        // general image map as well.  They can always be re-loaded
        // if it turns out another view still needs them.
        QMutexLocker locker(&m_imageMapMutex);
        for (ImageMap::iterator i = m_scaled[v].begin();
             i != m_scaled[v].end(); ++i) {
            m_images.erase(i->first);
        }
        m_scaled.erase(v);
    }
}

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

bool
ImageLayer::getImageOriginalSize(QString name, QSize &size) const
{
//    cerr << "getImageOriginalSize: \"" << name << "\"" << endl;

    QMutexLocker locker(&m_imageMapMutex);
    if (m_images.find(name) == m_images.end()) {
//        cerr << "don't have, trying to open local" << endl;
        m_images[name] = QImage(getLocalFilename(name));
    }
    if (m_images[name].isNull()) {
//        cerr << "null image" << endl;
        return false;
    } else {
        size = m_images[name].size();
        return true;
    }
}

QImage 
ImageLayer::getImage(View *v, QString name, QSize maxSize) const
{
//    SVDEBUG << "ImageLayer::getImage(" << v << ", " << name << ", ("
//              << maxSize.width() << "x" << maxSize.height() << "))" << endl;

    if (!m_scaled[v][name].isNull()  &&
        ((m_scaled[v][name].width()  == maxSize.width() &&
          m_scaled[v][name].height() <= maxSize.height()) ||
         (m_scaled[v][name].width()  <= maxSize.width() &&
          m_scaled[v][name].height() == maxSize.height()))) {
//        cerr << "cache hit" << endl;
        return m_scaled[v][name];
    }

    QMutexLocker locker(&m_imageMapMutex);

    if (m_images.find(name) == m_images.end()) {
        m_images[name] = QImage(getLocalFilename(name));
    }

    if (m_images[name].isNull()) {
//        cerr << "null image" << endl;
        m_scaled[v][name] = QImage();
    } else if (m_images[name].width() <= maxSize.width() &&
               m_images[name].height() <= maxSize.height()) {
        m_scaled[v][name] = m_images[name];
    } else {
        m_scaled[v][name] =
            m_images[name].scaled(maxSize,
                                  Qt::KeepAspectRatio,
                                  Qt::SmoothTransformation);
    }

    return m_scaled[v][name];
}

void
ImageLayer::drawStart(View *v, QMouseEvent *e)
{
//    SVDEBUG << "ImageLayer::drawStart(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model) {
	SVDEBUG << "ImageLayer::drawStart: no model" << endl;
	return;
    }

    sv_frame_t frame = v->getFrameForX(e->x());
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    m_editingPoint = ImageModel::Point(frame, "", "");
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) finish(m_editingCommand);
    m_editingCommand = new ImageModel::EditCommand(m_model, "Add Image");
    m_editingCommand->addPoint(m_editingPoint);

    m_editing = true;
}

void
ImageLayer::drawDrag(View *v, QMouseEvent *e)
{
//    SVDEBUG << "ImageLayer::drawDrag(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model || !m_editing) return;

    sv_frame_t frame = v->getFrameForX(e->x());
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    m_editingCommand->deletePoint(m_editingPoint);
    m_editingPoint.frame = frame;
    m_editingCommand->addPoint(m_editingPoint);
}

void
ImageLayer::drawEnd(View *, QMouseEvent *)
{
//    SVDEBUG << "ImageLayer::drawEnd(" << e->x() << "," << e->y() << ")" << endl;
    if (!m_model || !m_editing) return;

    ImageDialog dialog(tr("Select image"), "", "");

    if (dialog.exec() == QDialog::Accepted) {

        checkAddSource(dialog.getImage());

	ImageModel::ChangeImageCommand *command =
	    new ImageModel::ChangeImageCommand
            (m_model, m_editingPoint, dialog.getImage(), dialog.getLabel());
	m_editingCommand->addCommand(command);
    } else {
        m_editingCommand->deletePoint(m_editingPoint);
    }

    finish(m_editingCommand);
    m_editingCommand = 0;
    m_editing = false;
}

bool
ImageLayer::addImage(sv_frame_t frame, QString url)
{
    QImage image(getLocalFilename(url));
    if (image.isNull()) {
        cerr << "Failed to open image from url \"" << url << "\" (local filename \"" << getLocalFilename(url) << "\"" << endl;
        delete m_fileSources[url];
        m_fileSources.erase(url);
        return false;
    }

    ImageModel::Point point(frame, url, "");
    ImageModel::EditCommand *command =
        new ImageModel::EditCommand(m_model, "Add Image");
    command->addPoint(point);
    finish(command);
    return true;
}

void
ImageLayer::editStart(View *v, QMouseEvent *e)
{
//    SVDEBUG << "ImageLayer::editStart(" << e->x() << "," << e->y() << ")" << endl;

    if (!m_model) return;

    ImageModel::PointList points = getLocalPoints(v, e->x(), e->y());
    if (points.empty()) return;

    m_editOrigin = e->pos();
    m_editingPoint = *points.begin();
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) {
	finish(m_editingCommand);
	m_editingCommand = 0;
    }

    m_editing = true;
}

void
ImageLayer::editDrag(View *v, QMouseEvent *e)
{
    if (!m_model || !m_editing) return;

    sv_frame_t frameDiff = v->getFrameForX(e->x()) - v->getFrameForX(m_editOrigin.x());
    sv_frame_t frame = m_originalPoint.frame + frameDiff;

    if (frame < 0) frame = 0;
    frame = (frame / m_model->getResolution()) * m_model->getResolution();

    if (!m_editingCommand) {
	m_editingCommand = new ImageModel::EditCommand(m_model, tr("Move Image"));
    }

    m_editingCommand->deletePoint(m_editingPoint);
    m_editingPoint.frame = frame;
    m_editingCommand->addPoint(m_editingPoint);
}

void
ImageLayer::editEnd(View *, QMouseEvent *)
{
//    SVDEBUG << "ImageLayer::editEnd(" << e->x() << "," << e->y() << ")" << endl;
    if (!m_model || !m_editing) return;

    if (m_editingCommand) {
	finish(m_editingCommand);
    }
    
    m_editingCommand = 0;
    m_editing = false;
}

bool
ImageLayer::editOpen(View *v, QMouseEvent *e)
{
    if (!m_model) return false;

    ImageModel::PointList points = getLocalPoints(v, e->x(), e->y());
    if (points.empty()) return false;

    QString image = points.begin()->image;
    QString label = points.begin()->label;

    ImageDialog dialog(tr("Select image"),
                       image,
                       label);

    if (dialog.exec() == QDialog::Accepted) {

        checkAddSource(dialog.getImage());

	ImageModel::ChangeImageCommand *command =
	    new ImageModel::ChangeImageCommand
            (m_model, *points.begin(), dialog.getImage(), dialog.getLabel());

        CommandHistory::getInstance()->addCommand(command);
    }

    return true;
}    

void
ImageLayer::moveSelection(Selection s, sv_frame_t newStartFrame)
{
    if (!m_model) return;

    ImageModel::EditCommand *command =
	new ImageModel::EditCommand(m_model, tr("Drag Selection"));

    ImageModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (ImageModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {

	if (s.contains(i->frame)) {
	    ImageModel::Point newPoint(*i);
	    newPoint.frame = i->frame + newStartFrame - s.getStartFrame();
	    command->deletePoint(*i);
	    command->addPoint(newPoint);
	}
    }

    finish(command);
}

void
ImageLayer::resizeSelection(Selection s, Selection newSize)
{
    if (!m_model) return;

    ImageModel::EditCommand *command =
	new ImageModel::EditCommand(m_model, tr("Resize Selection"));

    ImageModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    double ratio =
	double(newSize.getEndFrame() - newSize.getStartFrame()) /
	double(s.getEndFrame() - s.getStartFrame());

    for (ImageModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {

	if (s.contains(i->frame)) {

	    double target = double(i->frame);
	    target = double(newSize.getStartFrame()) +
		target - double(s.getStartFrame()) * ratio;

	    ImageModel::Point newPoint(*i);
	    newPoint.frame = lrint(target);
	    command->deletePoint(*i);
	    command->addPoint(newPoint);
	}
    }

    finish(command);
}

void
ImageLayer::deleteSelection(Selection s)
{
    if (!m_model) return;

    ImageModel::EditCommand *command =
	new ImageModel::EditCommand(m_model, tr("Delete Selection"));

    ImageModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (ImageModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {
	if (s.contains(i->frame)) command->deletePoint(*i);
    }

    finish(command);
}

void
ImageLayer::copy(View *v, Selection s, Clipboard &to)
{
    if (!m_model) return;

    ImageModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (ImageModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {
	if (s.contains(i->frame)) {
            Clipboard::Point point(i->frame, i->label);
            point.setReferenceFrame(alignToReference(v, i->frame));
            to.addPoint(point);
        }
    }
}

bool
ImageLayer::paste(View *v, const Clipboard &from, sv_frame_t /* frameOffset */, bool /* interactive */)
{
    if (!m_model) return false;

    const Clipboard::PointList &points = from.getPoints();

    bool realign = false;

    if (clipboardHasDifferentAlignment(v, from)) {

        QMessageBox::StandardButton button =
            QMessageBox::question(v, tr("Re-align pasted items?"),
                                  tr("The items you are pasting came from a layer with different source material from this one.  Do you want to re-align them in time, to match the source material for this layer?"),
                                  QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel,
                                  QMessageBox::Yes);

        if (button == QMessageBox::Cancel) {
            return false;
        }

        if (button == QMessageBox::Yes) {
            realign = true;
        }
    }

    ImageModel::EditCommand *command =
	new ImageModel::EditCommand(m_model, tr("Paste"));

    for (Clipboard::PointList::const_iterator i = points.begin();
         i != points.end(); ++i) {
        
        if (!i->haveFrame()) continue;

        sv_frame_t frame = 0;

        if (!realign) {
            
            frame = i->getFrame();

        } else {

            if (i->haveReferenceFrame()) {
                frame = i->getReferenceFrame();
                frame = alignFromReference(v, frame);
            } else {
                frame = i->getFrame();
            }
        }

        ImageModel::Point newPoint(frame);

        //!!! inadequate
        
        if (i->haveLabel()) {
            newPoint.label = i->getLabel();
        } else if (i->haveValue()) {
            newPoint.label = QString("%1").arg(i->getValue());
        } else {
            newPoint.label = tr("New Point");
        }
        
        command->addPoint(newPoint);
    }

    finish(command);
    return true;
}

QString
ImageLayer::getLocalFilename(QString img) const
{
    if (m_fileSources.find(img) == m_fileSources.end()) {
        checkAddSource(img);
        if (m_fileSources.find(img) == m_fileSources.end()) {
            return img;
        }
    }
    return m_fileSources[img]->getLocalFilename();
}

void
ImageLayer::checkAddSource(QString img) const
{
    SVDEBUG << "ImageLayer::checkAddSource(" << img << "): yes, trying..." << endl;

    if (m_fileSources.find(img) != m_fileSources.end()) {
        return;
    }

    ProgressDialog dialog(tr("Opening image URL..."), true, 2000);
    FileSource *rf = new FileSource(img, &dialog);
    if (rf->isOK()) {
        cerr << "ok, adding it (local filename = " << rf->getLocalFilename() << ")" << endl;
        m_fileSources[img] = rf;
        connect(rf, SIGNAL(ready()), this, SLOT(fileSourceReady()));
    } else {
        delete rf;
    }
}

void
ImageLayer::checkAddSources()
{
    const ImageModel::PointList &points(m_model->getPoints());

    for (ImageModel::PointList::const_iterator i = points.begin();
	 i != points.end(); ++i) {
        
        checkAddSource((*i).image);
    }
}

void
ImageLayer::fileSourceReady()
{
//    SVDEBUG << "ImageLayer::fileSourceReady" << endl;

    FileSource *rf = dynamic_cast<FileSource *>(sender());
    if (!rf) return;

    QString img;
    for (FileSourceMap::const_iterator i = m_fileSources.begin();
         i != m_fileSources.end(); ++i) {
        if (i->second == rf) {
            img = i->first;
//            cerr << "it's image \"" << img << "\"" << endl;
            break;
        }
    }
    if (img == "") return;

    QMutexLocker locker(&m_imageMapMutex);
    m_images.erase(img);
    for (ViewImageMap::iterator i = m_scaled.begin(); i != m_scaled.end(); ++i) {
        i->second.erase(img);
        emit modelChanged();
    }
}

void
ImageLayer::toXml(QTextStream &stream,
                  QString indent, QString extraAttributes) const
{
    Layer::toXml(stream, indent, extraAttributes);
}

void
ImageLayer::setProperties(const QXmlAttributes &)
{
}