view layer/SliceLayer.cpp @ 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 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.
*/

#include "SliceLayer.h"

#include "view/View.h"
#include "base/AudioLevel.h"
#include "base/RangeMapper.h"
#include "base/RealTime.h"
#include "ColourMapper.h"
#include "ColourDatabase.h"

#include "PaintAssistant.h"

#include <QPainter>
#include <QPainterPath>
#include <QTextStream>


SliceLayer::SliceLayer() :
    m_sliceableModel(0),
    m_colourMap(0),
    m_energyScale(dBScale),
    m_samplingMode(SampleMean),
    m_plotStyle(PlotSteps),
    m_binScale(LinearBins),
    m_normalize(false),
    m_threshold(0.0),
    m_initialThreshold(0.0),
    m_gain(1.0),
    m_currentf0(0),
    m_currentf1(0)
{
}

SliceLayer::~SliceLayer()
{

}

void
SliceLayer::setSliceableModel(const Model *model)
{
    const DenseThreeDimensionalModel *sliceable =
        dynamic_cast<const DenseThreeDimensionalModel *>(model);

    if (model && !sliceable) {
        cerr << "WARNING: SliceLayer::setSliceableModel(" << model
                  << "): model is not a DenseThreeDimensionalModel" << endl;
    }

    if (m_sliceableModel == sliceable) return;

    m_sliceableModel = sliceable;

    connectSignals(m_sliceableModel);

    emit modelReplaced();
}

void
SliceLayer::sliceableModelReplaced(const Model *orig, const Model *replacement)
{
    SVDEBUG << "SliceLayer::sliceableModelReplaced(" << orig << ", " << replacement << ")" << endl;

    if (orig == m_sliceableModel) {
        setSliceableModel
            (dynamic_cast<const DenseThreeDimensionalModel *>(replacement));
    }
}

void
SliceLayer::modelAboutToBeDeleted(Model *m)
{
    SVDEBUG << "SliceLayer::modelAboutToBeDeleted(" << m << ")" << endl;

    if (m == m_sliceableModel) {
        setSliceableModel(0);
    }
}

QString
SliceLayer::getFeatureDescription(LayerGeometryProvider *v, QPoint &p) const
{
    int minbin, maxbin, range;
    return getFeatureDescriptionAux(v, p, true, minbin, maxbin, range);
}

QString
SliceLayer::getFeatureDescriptionAux(LayerGeometryProvider *v, QPoint &p,
                                     bool includeBinDescription,
                                     int &minbin, int &maxbin, int &range) const
{
    minbin = 0;
    maxbin = 0;
    if (!m_sliceableModel) return "";

    int xorigin = m_xorigins[v];
    int w = v->getPaintWidth() - xorigin - 1;
    
    int mh = m_sliceableModel->getHeight();
    minbin = getBinForX(p.x() - xorigin, mh, w);
    maxbin = getBinForX(p.x() - xorigin + 1, mh, w);

    if (minbin >= mh) minbin = mh - 1;
    if (maxbin >= mh) maxbin = mh - 1;
    if (minbin < 0) minbin = 0;
    if (maxbin < 0) maxbin = 0;
    
    sv_samplerate_t sampleRate = m_sliceableModel->getSampleRate();

    sv_frame_t f0 = m_currentf0;
    sv_frame_t f1 = m_currentf1;

    RealTime rt0 = RealTime::frame2RealTime(f0, sampleRate);
    RealTime rt1 = RealTime::frame2RealTime(f1, sampleRate);
    
    range = int(f1 - f0 + 1);

    QString rtrangestr = QString("%1 s").arg((rt1 - rt0).toText().c_str());

    if (includeBinDescription) {

        float minvalue = 0.0;
        if (minbin < int(m_values.size())) minvalue = m_values[minbin];

        float maxvalue = minvalue;
        if (maxbin < int(m_values.size())) maxvalue = m_values[maxbin];
        
        if (minvalue > maxvalue) std::swap(minvalue, maxvalue);
        
        QString binstr;
        if (maxbin != minbin) {
            binstr = tr("%1 - %2").arg(minbin+1).arg(maxbin+1);
        } else {
            binstr = QString("%1").arg(minbin+1);
        }

        QString valuestr;
        if (maxvalue != minvalue) {
            valuestr = tr("%1 - %2").arg(minvalue).arg(maxvalue);
        } else {
            valuestr = QString("%1").arg(minvalue);
        }

        QString description = tr("Time:\t%1 - %2\nRange:\t%3 samples (%4)\nBin:\t%5\n%6 value:\t%7")
            .arg(QString::fromStdString(rt0.toText(true)))
            .arg(QString::fromStdString(rt1.toText(true)))
            .arg(range)
            .arg(rtrangestr)
            .arg(binstr)
            .arg(m_samplingMode == NearestSample ? tr("First") :
                 m_samplingMode == SampleMean ? tr("Mean") : tr("Peak"))
            .arg(valuestr);
        
        return description;
    
    } else {

        QString description = tr("Time:\t%1 - %2\nRange:\t%3 samples (%4)")
            .arg(QString::fromStdString(rt0.toText(true)))
            .arg(QString::fromStdString(rt1.toText(true)))
            .arg(range)
            .arg(rtrangestr);
        
        return description;
    }
}

double
SliceLayer::getXForBin(int bin, int count, double w) const
{
    double x = 0;

    switch (m_binScale) {

    case LinearBins:
        x = (w * bin) / count;
        break;
        
    case LogBins:
        x = (w * log10(bin + 1)) / log10(count + 1);
        break;
        
    case InvertedLogBins:
        x = w - (w * log10(count - bin - 1)) / log10(count);
        break;
    }

    return x;
}

int
SliceLayer::getBinForX(double x, int count, double w) const
{
    int bin = 0;

    switch (m_binScale) {

    case LinearBins:
        bin = int((x * count) / w + 0.0001);
        break;
        
    case LogBins:
        bin = int(pow(10.0, (x * log10(count + 1)) / w) - 1 + 0.0001);
        break;

    case InvertedLogBins:
        bin = count + 1 - int(pow(10.0, (log10(count) * (w - x)) / double(w)) + 0.0001);
        break;
    }

    return bin;
}

double
SliceLayer::getYForValue(double value, const LayerGeometryProvider *v, double &norm) const
{
    norm = 0.0;

    if (m_yorigins.find(v) == m_yorigins.end()) return 0;

    value *= m_gain;

    int yorigin = m_yorigins[v];
    int h = m_heights[v];
    double thresh = getThresholdDb();

    double y = 0.0;

    if (h <= 0) return y;

    switch (m_energyScale) {

    case dBScale:
    {
        double db = thresh;
        if (value > 0.0) db = 10.0 * log10(fabs(value));
        if (db < thresh) db = thresh;
        norm = (db - thresh) / -thresh;
        y = yorigin - (double(h) * norm);
        break;
    }
    
    case MeterScale:
        y = AudioLevel::multiplier_to_preview(value, h);
        norm = double(y) / double(h);
        y = yorigin - y;
        break;
        
    case AbsoluteScale:
        value = fabs(value);
        // and fall through
        
    case LinearScale:
    default:
        norm = (value - m_threshold);
        if (norm < 0) norm = 0;
        y = yorigin - (double(h) * norm);
        break;
    }
    
    return y;
}

double
SliceLayer::getValueForY(double y, const LayerGeometryProvider *v) const
{
    double value = 0.0;

    if (m_yorigins.find(v) == m_yorigins.end()) return value;

    int yorigin = m_yorigins[v];
    int h = m_heights[v];
    double thresh = getThresholdDb();

    if (h <= 0) return value;

    y = yorigin - y;

    switch (m_energyScale) {

    case dBScale:
    {
        double db = ((y / h) * -thresh) + thresh;
        value = pow(10.0, db/10.0);
        break;
    }

    case MeterScale:
        value = AudioLevel::preview_to_multiplier(int(lrint(y)), h);
        break;

    case LinearScale:
    case AbsoluteScale:
    default:
        value = y / h + m_threshold;
    }

    return value / m_gain;
}

void
SliceLayer::paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const
{
    if (!m_sliceableModel || !m_sliceableModel->isOK() ||
        !m_sliceableModel->isReady()) return;

    paint.save();
    paint.setRenderHint(QPainter::Antialiasing, false);
    paint.setBrush(Qt::NoBrush);

    if (v->getViewManager() && v->getViewManager()->shouldShowScaleGuides()) {
        if (!m_scalePoints.empty()) {
            paint.setPen(QColor(240, 240, 240)); //!!! and dark background?
            for (int i = 0; i < (int)m_scalePoints.size(); ++i) {
                paint.drawLine(0, m_scalePoints[i], rect.width(), m_scalePoints[i]);
            }
        }
    }

    paint.setPen(getBaseQColor());

    int xorigin = getVerticalScaleWidth(v, true, paint) + 1;
    int w = v->getPaintWidth() - xorigin - 1;

    m_xorigins[v] = xorigin; // for use in getFeatureDescription
    
    int yorigin = v->getPaintHeight() - 20 - paint.fontMetrics().height() - 7;
    int h = yorigin - paint.fontMetrics().height() - 8;

    m_yorigins[v] = yorigin; // for getYForValue etc
    m_heights[v] = h;

    if (h <= 0) return;

    QPainterPath path;

    int mh = m_sliceableModel->getHeight();

    int divisor = 0;

    m_values.clear();
    for (int bin = 0; bin < mh; ++bin) {
        m_values.push_back(0.0);
    }

    sv_frame_t f0 = v->getCentreFrame();
    int f0x = v->getXForFrame(f0);
    f0 = v->getFrameForX(f0x);
    sv_frame_t f1 = v->getFrameForX(f0x + 1);
    if (f1 > f0) --f1;

//    cerr << "centre frame " << v->getCentreFrame() << ", x " << f0x << ", f0 " << f0 << ", f1 " << f1 << endl;

    int res = m_sliceableModel->getResolution();
    int col0 = int(f0 / res);
    int col1 = col0;
    if (m_samplingMode != NearestSample) col1 = int(f1 / res);
    f0 = col0 * res;
    f1 = (col1 + 1) * res - 1;

//    cerr << "resolution " << res << ", col0 " << col0 << ", col1 " << col1 << ", f0 " << f0 << ", f1 " << f1 << endl;

    m_currentf0 = f0;
    m_currentf1 = f1;

    BiasCurve curve;
    getBiasCurve(curve);
    int cs = int(curve.size());

    for (int col = col0; col <= col1; ++col) {
        for (int bin = 0; bin < mh; ++bin) {
            float value = m_sliceableModel->getValueAt(col, bin);
            if (bin < cs) value *= curve[bin];
            if (m_samplingMode == SamplePeak) {
                if (value > m_values[bin]) m_values[bin] = value;
            } else {
                m_values[bin] += value;
            }
        }
        ++divisor;
    }

    float max = 0.0;
    for (int bin = 0; bin < mh; ++bin) {
        if (m_samplingMode == SampleMean && divisor > 0) {
            m_values[bin] /= float(divisor);
        }
        if (m_values[bin] > max) max = m_values[bin];
    }
    if (max != 0.0 && m_normalize) {
        for (int bin = 0; bin < mh; ++bin) {
            m_values[bin] /= max;
        }
    }

    double nx = xorigin;

    ColourMapper mapper(m_colourMap, 0, 1);

    for (int bin = 0; bin < mh; ++bin) {

        double x = nx;
        nx = xorigin + getXForBin(bin + 1, mh, w);

        double value = m_values[bin];
        double norm = 0.0;
        double y = getYForValue(value, v, norm);

        if (m_plotStyle == PlotLines) {

            if (bin == 0) {
                path.moveTo(x, y);
            } else {
                path.lineTo(x, y);
            }

        } else if (m_plotStyle == PlotSteps) {

            if (bin == 0) {
                path.moveTo(x, y);
            } else {
                path.lineTo(x, y);
            }
            path.lineTo(nx, y);

        } else if (m_plotStyle == PlotBlocks) {

            path.moveTo(x, yorigin);
            path.lineTo(x, y);
            path.lineTo(nx, y);
            path.lineTo(nx, yorigin);
            path.lineTo(x, yorigin);

        } else if (m_plotStyle == PlotFilledBlocks) {

            paint.fillRect(QRectF(x, y, nx - x, yorigin - y), mapper.map(norm));
        }

    }

    if (m_plotStyle != PlotFilledBlocks) {
        paint.drawPath(path);
    }
    paint.restore();
/*
    QPoint discard;

    if (v->getViewManager() && v->getViewManager()->shouldShowFrameCount() &&
        v->shouldIlluminateLocalFeatures(this, discard)) {

        int sampleRate = m_sliceableModel->getSampleRate();

        QString startText = QString("%1 / %2")
            .arg(QString::fromStdString
                 (RealTime::frame2RealTime
                  (f0, sampleRate).toText(true)))
            .arg(f0);

        QString endText = QString(" %1 / %2")
            .arg(QString::fromStdString
                 (RealTime::frame2RealTime
                  (f1, sampleRate).toText(true)))
            .arg(f1);

        QString durationText = QString("(%1 / %2) ")
            .arg(QString::fromStdString
                 (RealTime::frame2RealTime
                  (f1 - f0 + 1, sampleRate).toText(true)))
            .arg(f1 - f0 + 1);

        v->drawVisibleText
            (paint, xorigin + 5,
             paint.fontMetrics().ascent() + 5,
             startText, PaintAssistant::OutlinedText);
        
        v->drawVisibleText
            (paint, xorigin + 5,
             paint.fontMetrics().ascent() + paint.fontMetrics().height() + 10,
             endText, PaintAssistant::OutlinedText);
        
        v->drawVisibleText
            (paint, xorigin + 5,
             paint.fontMetrics().ascent() + 2*paint.fontMetrics().height() + 15,
             durationText, PaintAssistant::OutlinedText);
    }
*/
}

int
SliceLayer::getVerticalScaleWidth(LayerGeometryProvider *, bool, QPainter &paint) const
{
    if (m_energyScale == LinearScale || m_energyScale == AbsoluteScale) {
	return std::max(paint.fontMetrics().width("0.0") + 13,
                        paint.fontMetrics().width("x10-10"));
    } else {
	return std::max(paint.fontMetrics().width(tr("0dB")),
			paint.fontMetrics().width(tr("-Inf"))) + 13;
    }
}

void
SliceLayer::paintVerticalScale(LayerGeometryProvider *v, bool, QPainter &paint, QRect rect) const
{
    double thresh = m_threshold;
    if (m_energyScale != LinearScale && m_energyScale != AbsoluteScale) {
        thresh = AudioLevel::dB_to_multiplier(getThresholdDb());
    }
    
//    int h = (rect.height() * 3) / 4;
//    int y = (rect.height() / 2) - (h / 2);
    
    int yorigin = v->getPaintHeight() - 20 - paint.fontMetrics().height() - 6;
    int h = yorigin - paint.fontMetrics().height() - 8;
    if (h < 0) return;

    QRect actual(rect.x(), rect.y() + yorigin - h, rect.width(), h);

    int mult = 1;

    PaintAssistant::paintVerticalLevelScale
        (paint, actual, thresh, 1.0 / m_gain,
         PaintAssistant::Scale(m_energyScale),
         mult,
         const_cast<std::vector<int> *>(&m_scalePoints));

    if (mult != 1 && mult != 0) {
        int log = int(lrint(log10(mult)));
        QString a = tr("x10");
        QString b = QString("%1").arg(-log);
        paint.drawText(3, 8 + paint.fontMetrics().ascent(), a);
        paint.drawText(3 + paint.fontMetrics().width(a),
                       3 + paint.fontMetrics().ascent(), b);
    }
}

Layer::PropertyList
SliceLayer::getProperties() const
{
    PropertyList list = SingleColourLayer::getProperties();
    list.push_back("Bin Scale");
    list.push_back("Plot Type");
    list.push_back("Scale");
    list.push_back("Normalize");
    list.push_back("Threshold");
    list.push_back("Gain");

    return list;
}

QString
SliceLayer::getPropertyLabel(const PropertyName &name) const
{
    if (name == "Plot Type") return tr("Plot Type");
    if (name == "Scale") return tr("Scale");
    if (name == "Normalize") return tr("Normalize");
    if (name == "Threshold") return tr("Threshold");
    if (name == "Gain") return tr("Gain");
    if (name == "Sampling Mode") return tr("Sampling Mode");
    if (name == "Bin Scale") return tr("Bin Scale");
    return SingleColourLayer::getPropertyLabel(name);
}

QString
SliceLayer::getPropertyIconName(const PropertyName &name) const
{
    if (name == "Normalize") return "normalise";
    return "";
}

Layer::PropertyType
SliceLayer::getPropertyType(const PropertyName &name) const
{
    if (name == "Gain") return RangeProperty;
    if (name == "Normalize") return ToggleProperty;
    if (name == "Threshold") return RangeProperty;
    if (name == "Plot Type") return ValueProperty;
    if (name == "Scale") return ValueProperty;
    if (name == "Sampling Mode") return ValueProperty;
    if (name == "Bin Scale") return ValueProperty;
    if (name == "Colour" && m_plotStyle == PlotFilledBlocks) return ValueProperty;
    return SingleColourLayer::getPropertyType(name);
}

QString
SliceLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == "Scale" ||
        name == "Normalize" ||
        name == "Sampling Mode" ||
        name == "Threshold" ||
        name == "Gain") return tr("Scale");
    if (name == "Plot Type" ||
        name == "Bin Scale") return tr("Bins");
    return SingleColourLayer::getPropertyGroupName(name);
}

int
SliceLayer::getPropertyRangeAndValue(const PropertyName &name,
                                     int *min, int *max, int *deflt) const
{
    int val = 0;

    int garbage0, garbage1, garbage2;
    if (!min) min = &garbage0;
    if (!max) max = &garbage1;
    if (!deflt) deflt = &garbage2;

    if (name == "Gain") {

	*min = -50;
	*max = 50;
        *deflt = 0;

        cerr << "gain is " << m_gain << ", mode is " << m_samplingMode << endl;

	val = int(lrint(log10(m_gain) * 20.0));
	if (val < *min) val = *min;
	if (val > *max) val = *max;

    } else if (name == "Threshold") {
        
	*min = -80;
	*max = 0;

        *deflt = int(lrint(AudioLevel::multiplier_to_dB(m_initialThreshold)));
	if (*deflt < *min) *deflt = *min;
	if (*deflt > *max) *deflt = *max;

	val = int(lrint(AudioLevel::multiplier_to_dB(m_threshold)));
	if (val < *min) val = *min;
	if (val > *max) val = *max;

    } else if (name == "Normalize") {
	
	val = (m_normalize ? 1 : 0);
        *deflt = 0;

    } else if (name == "Colour" && m_plotStyle == PlotFilledBlocks) {
            
        *min = 0;
        *max = ColourMapper::getColourMapCount() - 1;
        *deflt = 0;
        
        val = m_colourMap;

    } else if (name == "Scale") {

	*min = 0;
	*max = 3;
        *deflt = (int)dBScale;

	val = (int)m_energyScale;

    } else if (name == "Sampling Mode") {

	*min = 0;
	*max = 2;
        *deflt = (int)SampleMean;
        
	val = (int)m_samplingMode;

    } else if (name == "Plot Type") {
        
        *min = 0;
        *max = 3;
        *deflt = (int)PlotSteps;

        val = (int)m_plotStyle;

    } else if (name == "Bin Scale") {
        
        *min = 0;
        *max = 2;
        *deflt = (int)LinearBins;
//        *max = 1; // I don't think we really do want to offer inverted log

        val = (int)m_binScale;

    } else {
	val = SingleColourLayer::getPropertyRangeAndValue(name, min, max, deflt);
    }

    return val;
}

QString
SliceLayer::getPropertyValueLabel(const PropertyName &name,
				    int value) const
{
    if (name == "Colour" && m_plotStyle == PlotFilledBlocks) {
        return ColourMapper::getColourMapName(value);
    }
    if (name == "Scale") {
	switch (value) {
	default:
	case 0: return tr("Linear");
	case 1: return tr("Meter");
	case 2: return tr("Log");
	case 3: return tr("Absolute");
	}
    }
    if (name == "Sampling Mode") {
	switch (value) {
	default:
	case 0: return tr("Any");
	case 1: return tr("Mean");
	case 2: return tr("Peak");
	}
    }
    if (name == "Plot Type") {
	switch (value) {
	default:
	case 0: return tr("Lines");
	case 1: return tr("Steps");
	case 2: return tr("Blocks");
	case 3: return tr("Colours");
	}
    }
    if (name == "Bin Scale") {
	switch (value) {
	default:
	case 0: return tr("Linear");
	case 1: return tr("Log");
	case 2: return tr("Rev Log");
	}
    }
    return SingleColourLayer::getPropertyValueLabel(name, value);
}

RangeMapper *
SliceLayer::getNewPropertyRangeMapper(const PropertyName &name) const
{
    if (name == "Gain") {
        return new LinearRangeMapper(-50, 50, -25, 25, tr("dB"));
    }
    if (name == "Threshold") {
        return new LinearRangeMapper(-80, 0, -80, 0, tr("dB"));
    }
    return SingleColourLayer::getNewPropertyRangeMapper(name);
}

void
SliceLayer::setProperty(const PropertyName &name, int value)
{
    if (name == "Gain") {
	setGain(powf(10, float(value)/20.0f));
    } else if (name == "Threshold") {
	if (value == -80) setThreshold(0.0f);
	else setThreshold(float(AudioLevel::dB_to_multiplier(value)));
    } else if (name == "Colour" && m_plotStyle == PlotFilledBlocks) {
        setFillColourMap(value);
    } else if (name == "Scale") {
	switch (value) {
	default:
	case 0: setEnergyScale(LinearScale); break;
	case 1: setEnergyScale(MeterScale); break;
	case 2: setEnergyScale(dBScale); break;
	case 3: setEnergyScale(AbsoluteScale); break;
	}
    } else if (name == "Plot Type") {
	setPlotStyle(PlotStyle(value));
    } else if (name == "Sampling Mode") {
	switch (value) {
	default:
	case 0: setSamplingMode(NearestSample); break;
	case 1: setSamplingMode(SampleMean); break;
	case 2: setSamplingMode(SamplePeak); break;
	}
    } else if (name == "Bin Scale") {
	switch (value) {
	default:
	case 0: setBinScale(LinearBins); break;
	case 1: setBinScale(LogBins); break;
	case 2: setBinScale(InvertedLogBins); break;
	}
    } else if (name == "Normalize") {
	setNormalize(value ? true : false);
    } else {
        SingleColourLayer::setProperty(name, value);
    }
}

void
SliceLayer::setFillColourMap(int map)
{
    if (m_colourMap == map) return;
    m_colourMap = map;
    emit layerParametersChanged();
}

void
SliceLayer::setEnergyScale(EnergyScale scale)
{
    if (m_energyScale == scale) return;
    m_energyScale = scale;
    emit layerParametersChanged();
}

void
SliceLayer::setSamplingMode(SamplingMode mode)
{
    if (m_samplingMode == mode) return;
    m_samplingMode = mode;
    emit layerParametersChanged();
}

void
SliceLayer::setPlotStyle(PlotStyle style)
{
    if (m_plotStyle == style) return;
    bool colourTypeChanged = (style == PlotFilledBlocks ||
                              m_plotStyle == PlotFilledBlocks);
    m_plotStyle = style;
    if (colourTypeChanged) {
        emit layerParameterRangesChanged();
    }
    emit layerParametersChanged();
}

void
SliceLayer::setBinScale(BinScale scale)
{
    if (m_binScale == scale) return;
    m_binScale = scale;
    emit layerParametersChanged();
}

void
SliceLayer::setNormalize(bool n)
{
    if (m_normalize == n) return;
    m_normalize = n;
    emit layerParametersChanged();
}

void
SliceLayer::setThreshold(float thresh)
{
    if (m_threshold == thresh) return;
    m_threshold = thresh;
    emit layerParametersChanged();
}

void
SliceLayer::setGain(float gain)
{
    if (m_gain == gain) return;
    m_gain = gain;
    emit layerParametersChanged();
}

float
SliceLayer::getThresholdDb() const
{
    if (m_threshold == 0.0) return -80.f;
    float db = float(AudioLevel::multiplier_to_dB(m_threshold));
    return db;
}

int
SliceLayer::getDefaultColourHint(bool darkbg, bool &impose)
{
    impose = false;
    return ColourDatabase::getInstance()->getColourIndex
        (QString(darkbg ? "Bright Blue" : "Blue"));
}

void
SliceLayer::toXml(QTextStream &stream,
                  QString indent, QString extraAttributes) const
{
    QString s;
    
    s += QString("colourScheme=\"%1\" "
		 "energyScale=\"%2\" "
                 "samplingMode=\"%3\" "
                 "plotStyle=\"%4\" "
                 "binScale=\"%5\" "
                 "gain=\"%6\" "
                 "threshold=\"%7\" "
                 "normalize=\"%8\"")
        .arg(m_colourMap)
	.arg(m_energyScale)
        .arg(m_samplingMode)
        .arg(m_plotStyle)
        .arg(m_binScale)
        .arg(m_gain)
        .arg(m_threshold)
        .arg(m_normalize ? "true" : "false");

    SingleColourLayer::toXml(stream, indent, extraAttributes + " " + s);
}

void
SliceLayer::setProperties(const QXmlAttributes &attributes)
{
    bool ok = false;

    SingleColourLayer::setProperties(attributes);

    EnergyScale scale = (EnergyScale)
	attributes.value("energyScale").toInt(&ok);
    if (ok) setEnergyScale(scale);

    SamplingMode mode = (SamplingMode)
	attributes.value("samplingMode").toInt(&ok);
    if (ok) setSamplingMode(mode);

    int colourMap = attributes.value("colourScheme").toInt(&ok);
    if (ok) setFillColourMap(colourMap);

    PlotStyle s = (PlotStyle)
	attributes.value("plotStyle").toInt(&ok);
    if (ok) setPlotStyle(s);

    BinScale b = (BinScale)
	attributes.value("binScale").toInt(&ok);
    if (ok) setBinScale(b);

    float gain = attributes.value("gain").toFloat(&ok);
    if (ok) setGain(gain);

    float threshold = attributes.value("threshold").toFloat(&ok);
    if (ok) setThreshold(threshold);

    bool normalize = (attributes.value("normalize").trimmed() == "true");
    setNormalize(normalize);
}

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