annotate layer/SpectrogramLayer.cpp @ 335:2f83b6e3b8ca

* Add Erase tool and mode
* Add icons for Normalize buttons in property boxes, and for Show Peaks
* Add support for velocity in notes -- not yet reflected in display or
  editable in the note edit dialog, but they are imported from MIDI,
  played, and exported
* Begin work on making pastes align pasted times (subtler than I thought)

/* -*- 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.
*/

#include "SpectrogramLayer.h"

#include "view/View.h"
#include "base/Profiler.h"
#include "base/AudioLevel.h"
#include "base/Window.h"
#include "base/Pitch.h"
#include "base/Preferences.h"
#include "base/RangeMapper.h"
#include "base/LogRange.h"
#include "base/CommandHistory.h"
#include "base/ColourMapper.h"
#include "ImageRegionFinder.h"

#include <QPainter>
#include <QImage>
#include <QPixmap>
#include <QRect>
#include <QTimer>
#include <QApplication>
#include <QMessageBox>
#include <QMouseEvent>
#include <QTextStream>

#include <iostream>

#include <cassert>
#include <cmath>

//#define DEBUG_SPECTROGRAM_REPAINT 1

SpectrogramLayer::SpectrogramLayer(Configuration config) :
    m_model(0),
    m_channel(0),
    m_windowSize(1024),
    m_windowType(HanningWindow),
    m_windowHopLevel(2),
    m_zeroPadLevel(0),
    m_fftSize(1024),
    m_gain(1.0),
    m_initialGain(1.0),
    m_threshold(0.0),
    m_initialThreshold(0.0),
    m_colourRotation(0),
    m_initialRotation(0),
    m_minFrequency(10),
    m_maxFrequency(8000),
    m_initialMaxFrequency(8000),
    m_colourScale(dBColourScale),
    m_colourMap(0),
    m_frequencyScale(LinearFrequencyScale),
    m_binDisplay(AllBins),
    m_normalizeColumns(false),
    m_normalizeVisibleArea(false),
    m_lastEmittedZoomStep(-1),
    m_lastPaintBlockWidth(0),
    m_updateTimer(0),
    m_candidateFillStartFrame(0),
    m_exiting(false),
    m_sliceableModel(0)
{
    if (config == FullRangeDb) {
        m_initialMaxFrequency = 0;
        setMaxFrequency(0);
    } else if (config == MelodicRange) {
	setWindowSize(8192);
	setWindowHopLevel(4);
        m_initialMaxFrequency = 1500;
	setMaxFrequency(1500);
        setMinFrequency(40);
	setColourScale(LinearColourScale);
        setColourMap(ColourMapper::Sunset);
        setFrequencyScale(LogFrequencyScale);
//        setGain(20);
    } else if (config == MelodicPeaks) {
	setWindowSize(4096);
	setWindowHopLevel(5);
        m_initialMaxFrequency = 2000;
	setMaxFrequency(2000);
	setMinFrequency(40);
	setFrequencyScale(LogFrequencyScale);
	setColourScale(LinearColourScale);
	setBinDisplay(PeakFrequencies);
	setNormalizeColumns(true);
    }

    Preferences *prefs = Preferences::getInstance();
    connect(prefs, SIGNAL(propertyChanged(PropertyContainer::PropertyName)),
            this, SLOT(preferenceChanged(PropertyContainer::PropertyName)));
    setWindowType(prefs->getWindowType());

    initialisePalette();
}

SpectrogramLayer::~SpectrogramLayer()
{
    delete m_updateTimer;
    m_updateTimer = 0;
    
    invalidateFFTModels();
}

void
SpectrogramLayer::setModel(const DenseTimeValueModel *model)
{
//    std::cerr << "SpectrogramLayer(" << this << "): setModel(" << model << ")" << std::endl;

    if (model == m_model) return;

    m_model = model;
    invalidateFFTModels();

    if (!m_model || !m_model->isOK()) return;

    connectSignals(m_model);

    connect(m_model, SIGNAL(modelChanged()), this, SLOT(cacheInvalid()));
    connect(m_model, SIGNAL(modelChanged(size_t, size_t)),
	    this, SLOT(cacheInvalid(size_t, size_t)));

    emit modelReplaced();
}

Layer::PropertyList
SpectrogramLayer::getProperties() const
{
    PropertyList list;
    list.push_back("Colour");
    list.push_back("Colour Scale");
    list.push_back("Window Size");
    list.push_back("Window Increment");
    list.push_back("Normalize Columns");
    list.push_back("Normalize Visible Area");
    list.push_back("Bin Display");
    list.push_back("Threshold");
    list.push_back("Gain");
    list.push_back("Colour Rotation");
//    list.push_back("Min Frequency");
//    list.push_back("Max Frequency");
    list.push_back("Frequency Scale");
////    list.push_back("Zero Padding");
    return list;
}

QString
SpectrogramLayer::getPropertyLabel(const PropertyName &name) const
{
    if (name == "Colour") return tr("Colour");
    if (name == "Colour Scale") return tr("Colour Scale");
    if (name == "Window Size") return tr("Window Size");
    if (name == "Window Increment") return tr("Window Overlap");
    if (name == "Normalize Columns") return tr("Normalize Columns");
    if (name == "Normalize Visible Area") return tr("Normalize Visible Area");
    if (name == "Bin Display") return tr("Bin Display");
    if (name == "Threshold") return tr("Threshold");
    if (name == "Gain") return tr("Gain");
    if (name == "Colour Rotation") return tr("Colour Rotation");
    if (name == "Min Frequency") return tr("Min Frequency");
    if (name == "Max Frequency") return tr("Max Frequency");
    if (name == "Frequency Scale") return tr("Frequency Scale");
    if (name == "Zero Padding") return tr("Smoothing");
    return "";
}

QString
SpectrogramLayer::getPropertyIconName(const PropertyName &name) const
{
    if (name == "Normalize Columns") return "normalise-columns";
    if (name == "Normalize Visible Area") return "normalise";
    return "";
}

Layer::PropertyType
SpectrogramLayer::getPropertyType(const PropertyName &name) const
{
    if (name == "Gain") return RangeProperty;
    if (name == "Colour Rotation") return RangeProperty;
    if (name == "Normalize Columns") return ToggleProperty;
    if (name == "Normalize Visible Area") return ToggleProperty;
    if (name == "Threshold") return RangeProperty;
    if (name == "Zero Padding") return ToggleProperty;
    return ValueProperty;
}

QString
SpectrogramLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == "Bin Display" ||
        name == "Frequency Scale") return tr("Bins");
    if (name == "Window Size" ||
	name == "Window Increment" ||
        name == "Zero Padding") return tr("Window");
    if (name == "Colour" ||
	name == "Threshold" ||
	name == "Colour Rotation") return tr("Colour");
    if (name == "Normalize Columns" ||
        name == "Normalize Visible Area" ||
        name == "Gain" ||
	name == "Colour Scale") return tr("Scale");
    return QString();
}

int
SpectrogramLayer::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 = lrintf(log10(m_initialGain) * 20.0);;
	if (*deflt < *min) *deflt = *min;
	if (*deflt > *max) *deflt = *max;

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

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

	*min = -50;
	*max = 0;

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

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

    } else if (name == "Colour Rotation") {

	*min = 0;
	*max = 256;
        *deflt = m_initialRotation;

	val = m_colourRotation;

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

	*min = 0;
	*max = 4;
        *deflt = int(dBColourScale);

	val = (int)m_colourScale;

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

	*min = 0;
	*max = ColourMapper::getColourMapCount() - 1;
        *deflt = 0;

	val = m_colourMap;

    } else if (name == "Window Size") {

	*min = 0;
	*max = 10;
        *deflt = 5;
	
	val = 0;
	int ws = m_windowSize;
	while (ws > 32) { ws >>= 1; val ++; }

    } else if (name == "Window Increment") {
	
	*min = 0;
	*max = 5;
        *deflt = 2;

        val = m_windowHopLevel;
    
    } else if (name == "Zero Padding") {
	
	*min = 0;
	*max = 1;
        *deflt = 0;
	
        val = m_zeroPadLevel > 0 ? 1 : 0;
    
    } else if (name == "Min Frequency") {

	*min = 0;
	*max = 9;
        *deflt = 1;

	switch (m_minFrequency) {
	case 0: default: val = 0; break;
	case 10: val = 1; break;
	case 20: val = 2; break;
	case 40: val = 3; break;
	case 100: val = 4; break;
	case 250: val = 5; break;
	case 500: val = 6; break;
	case 1000: val = 7; break;
	case 4000: val = 8; break;
	case 10000: val = 9; break;
	}
    
    } else if (name == "Max Frequency") {

	*min = 0;
	*max = 9;
        *deflt = 6;

	switch (m_maxFrequency) {
	case 500: val = 0; break;
	case 1000: val = 1; break;
	case 1500: val = 2; break;
	case 2000: val = 3; break;
	case 4000: val = 4; break;
	case 6000: val = 5; break;
	case 8000: val = 6; break;
	case 12000: val = 7; break;
	case 16000: val = 8; break;
	default: val = 9; break;
	}

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

	*min = 0;
	*max = 1;
        *deflt = int(LinearFrequencyScale);
	val = (int)m_frequencyScale;

    } else if (name == "Bin Display") {

	*min = 0;
	*max = 2;
        *deflt = int(AllBins);
	val = (int)m_binDisplay;

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

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

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

    return val;
}

QString
SpectrogramLayer::getPropertyValueLabel(const PropertyName &name,
					int value) const
{
    if (name == "Colour") {
        return ColourMapper::getColourMapName(value);
    }
    if (name == "Colour Scale") {
	switch (value) {
	default:
	case 0: return tr("Linear");
	case 1: return tr("Meter");
	case 2: return tr("dBV^2");
	case 3: return tr("dBV");
	case 4: return tr("Phase");
	}
    }
    if (name == "Window Size") {
	return QString("%1").arg(32 << value);
    }
    if (name == "Window Increment") {
	switch (value) {
	default:
	case 0: return tr("None");
	case 1: return tr("25 %");
	case 2: return tr("50 %");
	case 3: return tr("75 %");
	case 4: return tr("87.5 %");
	case 5: return tr("93.75 %");
	}
    }
    if (name == "Zero Padding") {
        if (value == 0) return tr("None");
        return QString("%1x").arg(value + 1);
    }
    if (name == "Min Frequency") {
	switch (value) {
	default:
	case 0: return tr("No min");
	case 1: return tr("10 Hz");
	case 2: return tr("20 Hz");
	case 3: return tr("40 Hz");
	case 4: return tr("100 Hz");
	case 5: return tr("250 Hz");
	case 6: return tr("500 Hz");
	case 7: return tr("1 KHz");
	case 8: return tr("4 KHz");
	case 9: return tr("10 KHz");
	}
    }
    if (name == "Max Frequency") {
	switch (value) {
	default:
	case 0: return tr("500 Hz");
	case 1: return tr("1 KHz");
	case 2: return tr("1.5 KHz");
	case 3: return tr("2 KHz");
	case 4: return tr("4 KHz");
	case 5: return tr("6 KHz");
	case 6: return tr("8 KHz");
	case 7: return tr("12 KHz");
	case 8: return tr("16 KHz");
	case 9: return tr("No max");
	}
    }
    if (name == "Frequency Scale") {
	switch (value) {
	default:
	case 0: return tr("Linear");
	case 1: return tr("Log");
	}
    }
    if (name == "Bin Display") {
	switch (value) {
	default:
	case 0: return tr("All Bins");
	case 1: return tr("Peak Bins");
	case 2: return tr("Frequencies");
	}
    }
    return tr("<unknown>");
}

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

void
SpectrogramLayer::setProperty(const PropertyName &name, int value)
{
    if (name == "Gain") {
	setGain(pow(10, float(value)/20.0));
    } else if (name == "Threshold") {
	if (value == -50) setThreshold(0.0);
	else setThreshold(AudioLevel::dB_to_multiplier(value));
    } else if (name == "Colour Rotation") {
	setColourRotation(value);
    } else if (name == "Colour") {
        setColourMap(value);
    } else if (name == "Window Size") {
	setWindowSize(32 << value);
    } else if (name == "Window Increment") {
        setWindowHopLevel(value);
    } else if (name == "Zero Padding") {
        setZeroPadLevel(value > 0.1 ? 3 : 0);
    } else if (name == "Min Frequency") {
	switch (value) {
	default:
	case 0: setMinFrequency(0); break;
	case 1: setMinFrequency(10); break;
	case 2: setMinFrequency(20); break;
	case 3: setMinFrequency(40); break;
	case 4: setMinFrequency(100); break;
	case 5: setMinFrequency(250); break;
	case 6: setMinFrequency(500); break;
	case 7: setMinFrequency(1000); break;
	case 8: setMinFrequency(4000); break;
	case 9: setMinFrequency(10000); break;
	}
        int vs = getCurrentVerticalZoomStep();
        if (vs != m_lastEmittedZoomStep) {
            emit verticalZoomChanged();
            m_lastEmittedZoomStep = vs;
        }
    } else if (name == "Max Frequency") {
	switch (value) {
	case 0: setMaxFrequency(500); break;
	case 1: setMaxFrequency(1000); break;
	case 2: setMaxFrequency(1500); break;
	case 3: setMaxFrequency(2000); break;
	case 4: setMaxFrequency(4000); break;
	case 5: setMaxFrequency(6000); break;
	case 6: setMaxFrequency(8000); break;
	case 7: setMaxFrequency(12000); break;
	case 8: setMaxFrequency(16000); break;
	default:
	case 9: setMaxFrequency(0); break;
	}
        int vs = getCurrentVerticalZoomStep();
        if (vs != m_lastEmittedZoomStep) {
            emit verticalZoomChanged();
            m_lastEmittedZoomStep = vs;
        }
    } else if (name == "Colour Scale") {
	switch (value) {
	default:
	case 0: setColourScale(LinearColourScale); break;
	case 1: setColourScale(MeterColourScale); break;
	case 2: setColourScale(dBSquaredColourScale); break;
	case 3: setColourScale(dBColourScale); break;
	case 4: setColourScale(PhaseColourScale); break;
	}
    } else if (name == "Frequency Scale") {
	switch (value) {
	default:
	case 0: setFrequencyScale(LinearFrequencyScale); break;
	case 1: setFrequencyScale(LogFrequencyScale); break;
	}
    } else if (name == "Bin Display") {
	switch (value) {
	default:
	case 0: setBinDisplay(AllBins); break;
	case 1: setBinDisplay(PeakBins); break;
	case 2: setBinDisplay(PeakFrequencies); break;
	}
    } else if (name == "Normalize Columns") {
	setNormalizeColumns(value ? true : false);
    } else if (name == "Normalize Visible Area") {
	setNormalizeVisibleArea(value ? true : false);
    }
}

void
SpectrogramLayer::invalidatePixmapCaches()
{
    for (ViewPixmapCache::iterator i = m_pixmapCaches.begin();
         i != m_pixmapCaches.end(); ++i) {
        i->second.validArea = QRect();
    }
}

void
SpectrogramLayer::invalidatePixmapCaches(size_t startFrame, size_t endFrame)
{
    for (ViewPixmapCache::iterator i = m_pixmapCaches.begin();
         i != m_pixmapCaches.end(); ++i) {

        //!!! when are views removed from the map? on setLayerDormant?
        const View *v = i->first;

        if (startFrame < v->getEndFrame() && int(endFrame) >= v->getStartFrame()) {
            i->second.validArea = QRect();
        }
    }
}

void
SpectrogramLayer::preferenceChanged(PropertyContainer::PropertyName name)
{
    std::cerr << "SpectrogramLayer::preferenceChanged(" << name.toStdString() << ")" << std::endl;

    if (name == "Window Type") {
        setWindowType(Preferences::getInstance()->getWindowType());
        return;
    }
    if (name == "Spectrogram Smoothing") {
        invalidatePixmapCaches();
        invalidateMagnitudes();
        emit layerParametersChanged();
    }
    if (name == "Tuning Frequency") {
        emit layerParametersChanged();
    }
}

void
SpectrogramLayer::setChannel(int ch)
{
    if (m_channel == ch) return;

    invalidatePixmapCaches();
    m_channel = ch;
    invalidateFFTModels();

    emit layerParametersChanged();
}

int
SpectrogramLayer::getChannel() const
{
    return m_channel;
}

void
SpectrogramLayer::setWindowSize(size_t ws)
{
    if (m_windowSize == ws) return;

    invalidatePixmapCaches();
    
    m_windowSize = ws;
    m_fftSize = ws * (m_zeroPadLevel + 1);
    
    invalidateFFTModels();

    emit layerParametersChanged();
}

size_t
SpectrogramLayer::getWindowSize() const
{
    return m_windowSize;
}

void
SpectrogramLayer::setWindowHopLevel(size_t v)
{
    if (m_windowHopLevel == v) return;

    invalidatePixmapCaches();
    
    m_windowHopLevel = v;
    
    invalidateFFTModels();

    emit layerParametersChanged();

//    fillCache();
}

size_t
SpectrogramLayer::getWindowHopLevel() const
{
    return m_windowHopLevel;
}

void
SpectrogramLayer::setZeroPadLevel(size_t v)
{
    if (m_zeroPadLevel == v) return;

    invalidatePixmapCaches();
    
    m_zeroPadLevel = v;
    m_fftSize = m_windowSize * (v + 1);

    invalidateFFTModels();

    emit layerParametersChanged();
}

size_t
SpectrogramLayer::getZeroPadLevel() const
{
    return m_zeroPadLevel;
}

void
SpectrogramLayer::setWindowType(WindowType w)
{
    if (m_windowType == w) return;

    invalidatePixmapCaches();
    
    m_windowType = w;

    invalidateFFTModels();

    emit layerParametersChanged();
}

WindowType
SpectrogramLayer::getWindowType() const
{
    return m_windowType;
}

void
SpectrogramLayer::setGain(float gain)
{
//    std::cerr << "SpectrogramLayer::setGain(" << gain << ") (my gain is now "
//	      << m_gain << ")" << std::endl;

    if (m_gain == gain) return;

    invalidatePixmapCaches();
    
    m_gain = gain;
    
    emit layerParametersChanged();
}

float
SpectrogramLayer::getGain() const
{
    return m_gain;
}

void
SpectrogramLayer::setThreshold(float threshold)
{
    if (m_threshold == threshold) return;

    invalidatePixmapCaches();
    
    m_threshold = threshold;

    emit layerParametersChanged();
}

float
SpectrogramLayer::getThreshold() const
{
    return m_threshold;
}

void
SpectrogramLayer::setMinFrequency(size_t mf)
{
    if (m_minFrequency == mf) return;

//    std::cerr << "SpectrogramLayer::setMinFrequency: " << mf << std::endl;

    invalidatePixmapCaches();
    invalidateMagnitudes();
    
    m_minFrequency = mf;

    emit layerParametersChanged();
}

size_t
SpectrogramLayer::getMinFrequency() const
{
    return m_minFrequency;
}

void
SpectrogramLayer::setMaxFrequency(size_t mf)
{
    if (m_maxFrequency == mf) return;

//    std::cerr << "SpectrogramLayer::setMaxFrequency: " << mf << std::endl;

    invalidatePixmapCaches();
    invalidateMagnitudes();
    
    m_maxFrequency = mf;
    
    emit layerParametersChanged();
}

size_t
SpectrogramLayer::getMaxFrequency() const
{
    return m_maxFrequency;
}

void
SpectrogramLayer::setColourRotation(int r)
{
    invalidatePixmapCaches();

    if (r < 0) r = 0;
    if (r > 256) r = 256;
    int distance = r - m_colourRotation;

    if (distance != 0) {
	rotatePalette(-distance);
	m_colourRotation = r;
    }
    
    emit layerParametersChanged();
}

void
SpectrogramLayer::setColourScale(ColourScale colourScale)
{
    if (m_colourScale == colourScale) return;

    invalidatePixmapCaches();
    
    m_colourScale = colourScale;
    
    emit layerParametersChanged();
}

SpectrogramLayer::ColourScale
SpectrogramLayer::getColourScale() const
{
    return m_colourScale;
}

void
SpectrogramLayer::setColourMap(int map)
{
    if (m_colourMap == map) return;

    invalidatePixmapCaches();
    
    m_colourMap = map;
    initialisePalette();

    emit layerParametersChanged();
}

int
SpectrogramLayer::getColourMap() const
{
    return m_colourMap;
}

void
SpectrogramLayer::setFrequencyScale(FrequencyScale frequencyScale)
{
    if (m_frequencyScale == frequencyScale) return;

    invalidatePixmapCaches();
    m_frequencyScale = frequencyScale;

    emit layerParametersChanged();
}

SpectrogramLayer::FrequencyScale
SpectrogramLayer::getFrequencyScale() const
{
    return m_frequencyScale;
}

void
SpectrogramLayer::setBinDisplay(BinDisplay binDisplay)
{
    if (m_binDisplay == binDisplay) return;

    invalidatePixmapCaches();
    m_binDisplay = binDisplay;

    emit layerParametersChanged();
}

SpectrogramLayer::BinDisplay
SpectrogramLayer::getBinDisplay() const
{
    return m_binDisplay;
}

void
SpectrogramLayer::setNormalizeColumns(bool n)
{
    if (m_normalizeColumns == n) return;

    invalidatePixmapCaches();
    invalidateMagnitudes();
    m_normalizeColumns = n;

    emit layerParametersChanged();
}

bool
SpectrogramLayer::getNormalizeColumns() const
{
    return m_normalizeColumns;
}

void
SpectrogramLayer::setNormalizeVisibleArea(bool n)
{
    std::cerr << "SpectrogramLayer::setNormalizeVisibleArea(" << n
              << ") (from " << m_normalizeVisibleArea << ")" << std::endl;

    if (m_normalizeVisibleArea == n) return;

    invalidatePixmapCaches();
    invalidateMagnitudes();
    m_normalizeVisibleArea = n;

    emit layerParametersChanged();
}

bool
SpectrogramLayer::getNormalizeVisibleArea() const
{
    return m_normalizeVisibleArea;
}

void
SpectrogramLayer::setLayerDormant(const View *v, bool dormant)
{
    if (dormant) {

#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "SpectrogramLayer::setLayerDormant(" << dormant << ")"
                  << std::endl;
#endif

        if (isLayerDormant(v)) {
            return;
        }

        Layer::setLayerDormant(v, true);

	invalidatePixmapCaches();
        m_pixmapCaches.erase(v);

        if (m_fftModels.find(v) != m_fftModels.end()) {

            if (m_sliceableModel == m_fftModels[v].first) {
                bool replaced = false;
                for (ViewFFTMap::iterator i = m_fftModels.begin();
                     i != m_fftModels.end(); ++i) {
                    if (i->second.first != m_sliceableModel) {
                        emit sliceableModelReplaced(m_sliceableModel, i->second.first);
                        replaced = true;
                        break;
                    }
                }
                if (!replaced) emit sliceableModelReplaced(m_sliceableModel, 0);
            }

            delete m_fftModels[v].first;
            m_fftModels.erase(v);
        }
	
    } else {

        Layer::setLayerDormant(v, false);
    }
}

void
SpectrogramLayer::cacheInvalid()
{
    invalidatePixmapCaches();
    invalidateMagnitudes();
}

void
SpectrogramLayer::cacheInvalid(size_t, size_t)
{
    // for now (or forever?)
    cacheInvalid();
}

void
SpectrogramLayer::fillTimerTimedOut()
{
    if (!m_model) return;

    bool allDone = true;

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::fillTimerTimedOut: have " << m_fftModels.size() << " FFT models associated with views" << std::endl;
#endif

    for (ViewFFTMap::iterator i = m_fftModels.begin();
         i != m_fftModels.end(); ++i) {

        const FFTModel *model = i->second.first;
        size_t lastFill = i->second.second;

        if (model) {

            size_t fill = model->getFillExtent();

#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "SpectrogramLayer::fillTimerTimedOut: extent for " << model << ": " << fill << ", last " << lastFill << ", total " << m_model->getEndFrame() << std::endl;
#endif

            if (fill >= lastFill) {
                if (fill >= m_model->getEndFrame() && lastFill > 0) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
                    std::cerr << "complete!" << std::endl;
#endif
                    invalidatePixmapCaches();
                    i->second.second = -1;
                    emit modelChanged();

                } else if (fill > lastFill) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
                    std::cerr << "SpectrogramLayer: emitting modelChanged("
                              << lastFill << "," << fill << ")" << std::endl;
#endif
                    invalidatePixmapCaches(lastFill, fill);
                    i->second.second = fill;
                    emit modelChanged(lastFill, fill);
                }
            } else {
#ifdef DEBUG_SPECTROGRAM_REPAINT
                std::cerr << "SpectrogramLayer: going backwards, emitting modelChanged("
                          << m_model->getStartFrame() << "," << m_model->getEndFrame() << ")" << std::endl;
#endif
                invalidatePixmapCaches();
                i->second.second = fill;
                emit modelChanged(m_model->getStartFrame(), m_model->getEndFrame());
            }

            if (i->second.second >= 0) {
                allDone = false;
            }
        }
    }

    if (allDone) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "SpectrogramLayer: all complete!" << std::endl;
#endif
        delete m_updateTimer;
        m_updateTimer = 0;
    }
}

bool
SpectrogramLayer::hasLightBackground() const 
{
    return ColourMapper(m_colourMap, 1.f, 255.f).hasLightBackground();
}

void
SpectrogramLayer::initialisePalette()
{
    int formerRotation = m_colourRotation;

    if (m_colourMap == (int)ColourMapper::BlackOnWhite) {
	m_palette.setColour(NO_VALUE, Qt::white);
    } else {
	m_palette.setColour(NO_VALUE, Qt::black);
    }

    ColourMapper mapper(m_colourMap, 1.f, 255.f);
    
    for (int pixel = 1; pixel < 256; ++pixel) {
        m_palette.setColour(pixel, mapper.map(pixel));
    }

    m_crosshairColour = mapper.getContrastingColour();

    m_colourRotation = 0;
    rotatePalette(m_colourRotation - formerRotation);
    m_colourRotation = formerRotation;
}

void
SpectrogramLayer::rotatePalette(int distance)
{
    QColor newPixels[256];

    newPixels[NO_VALUE] = m_palette.getColour(NO_VALUE);

    for (int pixel = 1; pixel < 256; ++pixel) {
	int target = pixel + distance;
	while (target < 1) target += 255;
	while (target > 255) target -= 255;
	newPixels[target] = m_palette.getColour(pixel);
    }

    for (int pixel = 0; pixel < 256; ++pixel) {
	m_palette.setColour(pixel, newPixels[pixel]);
    }
}

unsigned char
SpectrogramLayer::getDisplayValue(View *v, float input) const
{
    int value;

    float min = 0.f;
    float max = 1.f;

    if (m_normalizeVisibleArea) {
        min = m_viewMags[v].getMin();
        max = m_viewMags[v].getMax();
    } else if (!m_normalizeColumns) {
        if (m_colourScale == LinearColourScale //||
//            m_colourScale == MeterColourScale) {
            ) {
            max = 0.1f;
        }
    }

    float thresh = -80.f;

    if (max == 0.f) max = 1.f;
    if (max == min) min = max - 0.0001f;

    switch (m_colourScale) {
	
    default:
    case LinearColourScale:
        value = int(((input - min) / (max - min)) * 255.f) + 1;
	break;
	
    case MeterColourScale:
        value = AudioLevel::multiplier_to_preview
            ((input - min) / (max - min), 254) + 1;
	break;

    case dBSquaredColourScale:
        input = ((input - min) * (input - min)) / ((max - min) * (max - min));
        if (input > 0.f) {
            input = 10.f * log10f(input);
        } else {
            input = thresh;
        }
        if (min > 0.f) {
            thresh = 10.f * log10f(min * min);
            if (thresh < -80.f) thresh = -80.f;
        }
	input = (input - thresh) / (-thresh);
	if (input < 0.f) input = 0.f;
	if (input > 1.f) input = 1.f;
	value = int(input * 255.f) + 1;
	break;
	
    case dBColourScale:
        //!!! experiment with normalizing the visible area this way.
        //In any case, we need to have some indication of what the dB
        //scale is relative to.
        input = (input - min) / (max - min);
        if (input > 0.f) {
            input = 10.f * log10f(input);
        } else {
            input = thresh;
        }
        if (min > 0.f) {
            thresh = 10.f * log10f(min);
            if (thresh < -80.f) thresh = -80.f;
        }
	input = (input - thresh) / (-thresh);
	if (input < 0.f) input = 0.f;
	if (input > 1.f) input = 1.f;
	value = int(input * 255.f) + 1;
	break;
	
    case PhaseColourScale:
	value = int((input * 127.0 / M_PI) + 128);
	break;
    }

    if (value > UCHAR_MAX) value = UCHAR_MAX;
    if (value < 0) value = 0;
    return value;
}

float
SpectrogramLayer::getInputForDisplayValue(unsigned char uc) const
{
    //!!! unused

    int value = uc;
    float input;

    //!!! incorrect for normalizing visible area (and also out of date)
    
    switch (m_colourScale) {
	
    default:
    case LinearColourScale:
	input = float(value - 1) / 255.0 / (m_normalizeColumns ? 1 : 50);
	break;
    
    case MeterColourScale:
	input = AudioLevel::preview_to_multiplier(value - 1, 255)
	    / (m_normalizeColumns ? 1.0 : 50.0);
	break;

    case dBSquaredColourScale:
	input = float(value - 1) / 255.0;
	input = (input * 80.0) - 80.0;
	input = powf(10.0, input) / 20.0;
	value = int(input);
	break;

    case dBColourScale:
	input = float(value - 1) / 255.0;
	input = (input * 80.0) - 80.0;
	input = powf(10.0, input) / 20.0;
	value = int(input);
	break;

    case PhaseColourScale:
	input = float(value - 128) * M_PI / 127.0;
	break;
    }

    return input;
}

float
SpectrogramLayer::getEffectiveMinFrequency() const
{
    int sr = m_model->getSampleRate();
    float minf = float(sr) / m_fftSize;

    if (m_minFrequency > 0.0) {
	size_t minbin = size_t((double(m_minFrequency) * m_fftSize) / sr + 0.01);
	if (minbin < 1) minbin = 1;
	minf = minbin * sr / m_fftSize;
    }

    return minf;
}

float
SpectrogramLayer::getEffectiveMaxFrequency() const
{
    int sr = m_model->getSampleRate();
    float maxf = float(sr) / 2;

    if (m_maxFrequency > 0.0) {
	size_t maxbin = size_t((double(m_maxFrequency) * m_fftSize) / sr + 0.1);
	if (maxbin > m_fftSize / 2) maxbin = m_fftSize / 2;
	maxf = maxbin * sr / m_fftSize;
    }

    return maxf;
}

bool
SpectrogramLayer::getYBinRange(View *v, int y, float &q0, float &q1) const
{
    int h = v->height();
    if (y < 0 || y >= h) return false;

    int sr = m_model->getSampleRate();
    float minf = getEffectiveMinFrequency();
    float maxf = getEffectiveMaxFrequency();

    bool logarithmic = (m_frequencyScale == LogFrequencyScale);

    //!!! wrong for smoothing -- wrong fft size for fft model

    q0 = v->getFrequencyForY(y, minf, maxf, logarithmic);
    q1 = v->getFrequencyForY(y - 1, minf, maxf, logarithmic);

    // Now map these on to actual bins

    int b0 = int((q0 * m_fftSize) / sr);
    int b1 = int((q1 * m_fftSize) / sr);
    
    //!!! this is supposed to return fractions-of-bins, as it were, hence the floats
    q0 = b0;
    q1 = b1;
    
//    q0 = (b0 * sr) / m_fftSize;
//    q1 = (b1 * sr) / m_fftSize;

    return true;
}
    
bool
SpectrogramLayer::getXBinRange(View *v, int x, float &s0, float &s1) const
{
    size_t modelStart = m_model->getStartFrame();
    size_t modelEnd = m_model->getEndFrame();

    // Each pixel column covers an exact range of sample frames:
    int f0 = v->getFrameForX(x) - modelStart;
    int f1 = v->getFrameForX(x + 1) - modelStart - 1;

    if (f1 < int(modelStart) || f0 > int(modelEnd)) {
	return false;
    }
      
    // And that range may be drawn from a possibly non-integral
    // range of spectrogram windows:

    size_t windowIncrement = getWindowIncrement();
    s0 = float(f0) / windowIncrement;
    s1 = float(f1) / windowIncrement;

    return true;
}
 
bool
SpectrogramLayer::getXBinSourceRange(View *v, int x, RealTime &min, RealTime &max) const
{
    float s0 = 0, s1 = 0;
    if (!getXBinRange(v, x, s0, s1)) return false;
    
    int s0i = int(s0 + 0.001);
    int s1i = int(s1);

    int windowIncrement = getWindowIncrement();
    int w0 = s0i * windowIncrement - (m_windowSize - windowIncrement)/2;
    int w1 = s1i * windowIncrement + windowIncrement +
	(m_windowSize - windowIncrement)/2 - 1;
    
    min = RealTime::frame2RealTime(w0, m_model->getSampleRate());
    max = RealTime::frame2RealTime(w1, m_model->getSampleRate());
    return true;
}

bool
SpectrogramLayer::getYBinSourceRange(View *v, int y, float &freqMin, float &freqMax)
const
{
    float q0 = 0, q1 = 0;
    if (!getYBinRange(v, y, q0, q1)) return false;

    int q0i = int(q0 + 0.001);
    int q1i = int(q1);

    int sr = m_model->getSampleRate();

    for (int q = q0i; q <= q1i; ++q) {
	if (q == q0i) freqMin = (sr * q) / m_fftSize;
	if (q == q1i) freqMax = (sr * (q+1)) / m_fftSize;
    }
    return true;
}

bool
SpectrogramLayer::getAdjustedYBinSourceRange(View *v, int x, int y,
					     float &freqMin, float &freqMax,
					     float &adjFreqMin, float &adjFreqMax)
const
{
    if (!m_model || !m_model->isOK() || !m_model->isReady()) {
	return false;
    }

    FFTModel *fft = getFFTModel(v);
    if (!fft) return false;

    float s0 = 0, s1 = 0;
    if (!getXBinRange(v, x, s0, s1)) return false;

    float q0 = 0, q1 = 0;
    if (!getYBinRange(v, y, q0, q1)) return false;

    int s0i = int(s0 + 0.001);
    int s1i = int(s1);

    int q0i = int(q0 + 0.001);
    int q1i = int(q1);

    int sr = m_model->getSampleRate();

    size_t windowSize = m_windowSize;
    size_t windowIncrement = getWindowIncrement();

    bool haveAdj = false;

    bool peaksOnly = (m_binDisplay == PeakBins ||
		      m_binDisplay == PeakFrequencies);

    for (int q = q0i; q <= q1i; ++q) {

	for (int s = s0i; s <= s1i; ++s) {

            if (!fft->isColumnAvailable(s)) continue;

	    float binfreq = (sr * q) / m_windowSize;
	    if (q == q0i) freqMin = binfreq;
	    if (q == q1i) freqMax = binfreq;

	    if (peaksOnly && !fft->isLocalPeak(s, q)) continue;

	    if (!fft->isOverThreshold(s, q, m_threshold * (m_fftSize/2))) continue;

	    float freq = binfreq;
	    bool steady = false;
	    
	    if (s < int(fft->getWidth()) - 1) {

                fft->estimateStableFrequency(s, q, freq);
	    
		if (!haveAdj || freq < adjFreqMin) adjFreqMin = freq;
		if (!haveAdj || freq > adjFreqMax) adjFreqMax = freq;

		haveAdj = true;
	    }
	}
    }

    if (!haveAdj) {
	adjFreqMin = adjFreqMax = 0.0;
    }

    return haveAdj;
}
    
bool
SpectrogramLayer::getXYBinSourceRange(View *v, int x, int y,
				      float &min, float &max,
				      float &phaseMin, float &phaseMax) const
{
    if (!m_model || !m_model->isOK() || !m_model->isReady()) {
	return false;
    }

    float q0 = 0, q1 = 0;
    if (!getYBinRange(v, y, q0, q1)) return false;

    float s0 = 0, s1 = 0;
    if (!getXBinRange(v, x, s0, s1)) return false;
    
    int q0i = int(q0 + 0.001);
    int q1i = int(q1);

    int s0i = int(s0 + 0.001);
    int s1i = int(s1);

    bool rv = false;

    size_t zp = getZeroPadLevel(v);
    q0i *= zp + 1;
    q1i *= zp + 1;

    FFTModel *fft = getFFTModel(v);

    if (fft) {

        int cw = fft->getWidth();
        int ch = fft->getHeight();

        min = 0.0;
        max = 0.0;
        phaseMin = 0.0;
        phaseMax = 0.0;
        bool have = false;

        for (int q = q0i; q <= q1i; ++q) {
            for (int s = s0i; s <= s1i; ++s) {
                if (s >= 0 && q >= 0 && s < cw && q < ch) {

                    if (!fft->isColumnAvailable(s)) continue;
                    
                    float value;

                    value = fft->getPhaseAt(s, q);
                    if (!have || value < phaseMin) { phaseMin = value; }
                    if (!have || value > phaseMax) { phaseMax = value; }

                    value = fft->getMagnitudeAt(s, q) / (m_fftSize/2);
                    if (!have || value < min) { min = value; }
                    if (!have || value > max) { max = value; }
                    
                    have = true;
                }	
            }
        }
        
        if (have) {
            rv = true;
        }
    }

    return rv;
}
   
size_t
SpectrogramLayer::getZeroPadLevel(const View *v) const
{
    //!!! tidy all this stuff

    if (m_binDisplay != AllBins) return 0;

    Preferences::SpectrogramSmoothing smoothing = 
        Preferences::getInstance()->getSpectrogramSmoothing();
    
    if (smoothing == Preferences::NoSpectrogramSmoothing ||
        smoothing == Preferences::SpectrogramInterpolated) return 0;

    if (m_frequencyScale == LogFrequencyScale) return 3;

    int sr = m_model->getSampleRate();
    
    size_t maxbin = m_fftSize / 2;
    if (m_maxFrequency > 0) {
	maxbin = int((double(m_maxFrequency) * m_fftSize) / sr + 0.1);
	if (maxbin > m_fftSize / 2) maxbin = m_fftSize / 2;
    }

    size_t minbin = 1;
    if (m_minFrequency > 0) {
	minbin = int((double(m_minFrequency) * m_fftSize) / sr + 0.1);
	if (minbin < 1) minbin = 1;
	if (minbin >= maxbin) minbin = maxbin - 1;
    }

    float perPixel =
        float(v->height()) /
        float((maxbin - minbin) / (m_zeroPadLevel + 1));

    if (perPixel > 2.8) {
        return 3; // 4x oversampling
    } else if (perPixel > 1.5) {
        return 1; // 2x
    } else {
        return 0; // 1x
    }
}

size_t
SpectrogramLayer::getFFTSize(const View *v) const
{
    return m_fftSize * (getZeroPadLevel(v) + 1);
}
	
FFTModel *
SpectrogramLayer::getFFTModel(const View *v) const
{
    if (!m_model) return 0;

    size_t fftSize = getFFTSize(v);

    if (m_fftModels.find(v) != m_fftModels.end()) {
        if (m_fftModels[v].first == 0) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "SpectrogramLayer::getFFTModel(" << v << "): Found null model" << std::endl;
#endif
            return 0;
        }
        if (m_fftModels[v].first->getHeight() != fftSize / 2 + 1) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "SpectrogramLayer::getFFTModel(" << v << "): Found a model with the wrong height (" << m_fftModels[v].first->getHeight() << ", wanted " << (fftSize / 2 + 1) << ")" << std::endl;
#endif
            delete m_fftModels[v].first;
            m_fftModels.erase(v);
        } else {
#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "SpectrogramLayer::getFFTModel(" << v << "): Found a good model of height " << m_fftModels[v].first->getHeight() << std::endl;
#endif
            return m_fftModels[v].first;
        }
    }

    if (m_fftModels.find(v) == m_fftModels.end()) {

        FFTModel *model = new FFTModel(m_model,
                                       m_channel,
                                       m_windowType,
                                       m_windowSize,
                                       getWindowIncrement(),
                                       fftSize,
                                       true,
                                       StorageAdviser::SpeedCritical,
                                       m_candidateFillStartFrame);

        if (!model->isOK()) {
            QMessageBox::critical
                (0, tr("FFT cache failed"),
                 tr("Failed to create the FFT model for this spectrogram.\n"
                    "There may be insufficient memory or disc space to continue."));
            delete model;
            m_fftModels[v] = FFTFillPair(0, 0);
            return 0;
        }

        if (!m_sliceableModel) {
#ifdef DEBUG_SPECTROGRAM
            std::cerr << "SpectrogramLayer: emitting sliceableModelReplaced(0, " << model << ")" << std::endl;
#endif
            ((SpectrogramLayer *)this)->sliceableModelReplaced(0, model);
            m_sliceableModel = model;
        }

        m_fftModels[v] = FFTFillPair(model, 0);

        model->resume();
        
        delete m_updateTimer;
        m_updateTimer = new QTimer((SpectrogramLayer *)this);
        connect(m_updateTimer, SIGNAL(timeout()),
                this, SLOT(fillTimerTimedOut()));
        m_updateTimer->start(200);
    }

    return m_fftModels[v].first;
}

const Model *
SpectrogramLayer::getSliceableModel() const
{
    if (m_sliceableModel) return m_sliceableModel;
    if (m_fftModels.empty()) return 0;
    m_sliceableModel = m_fftModels.begin()->second.first;
    return m_sliceableModel;
}

void
SpectrogramLayer::invalidateFFTModels()
{
    for (ViewFFTMap::iterator i = m_fftModels.begin();
         i != m_fftModels.end(); ++i) {
        delete i->second.first;
    }
    
    m_fftModels.clear();

    if (m_sliceableModel) {
        std::cerr << "SpectrogramLayer: emitting sliceableModelReplaced(" << m_sliceableModel << ", 0)" << std::endl;
        emit sliceableModelReplaced(m_sliceableModel, 0);
        m_sliceableModel = 0;
    }
}

void
SpectrogramLayer::invalidateMagnitudes()
{
    m_viewMags.clear();
    for (std::vector<MagnitudeRange>::iterator i = m_columnMags.begin();
         i != m_columnMags.end(); ++i) {
        *i = MagnitudeRange();
    }
}

bool
SpectrogramLayer::updateViewMagnitudes(View *v) const
{
    MagnitudeRange mag;

    int x0 = 0, x1 = v->width();
    float s00 = 0, s01 = 0, s10 = 0, s11 = 0;
    
    if (!getXBinRange(v, x0, s00, s01)) {
        s00 = s01 = m_model->getStartFrame() / getWindowIncrement();
    }

    if (!getXBinRange(v, x1, s10, s11)) {
        s10 = s11 = m_model->getEndFrame() / getWindowIncrement();
    }

    int s0 = int(std::min(s00, s10) + 0.0001);
    int s1 = int(std::max(s01, s11) + 0.0001);

//    std::cerr << "SpectrogramLayer::updateViewMagnitudes: x0 = " << x0 << ", x1 = " << x1 << ", s00 = " << s00 << ", s11 = " << s11 << " s0 = " << s0 << ", s1 = " << s1 << std::endl;

    if (int(m_columnMags.size()) <= s1) {
        m_columnMags.resize(s1 + 1);
    }

    for (int s = s0; s <= s1; ++s) {
        if (m_columnMags[s].isSet()) {
            mag.sample(m_columnMags[s]);
        }
    }

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::updateViewMagnitudes returning from cols "
              << s0 << " -> " << s1 << " inclusive" << std::endl;
#endif

    if (!mag.isSet()) return false;
    if (mag == m_viewMags[v]) return false;
    m_viewMags[v] = mag;
    return true;
}

void
SpectrogramLayer::paint(View *v, QPainter &paint, QRect rect) const
{
    // What a lovely, old-fashioned function this is.
    // It's practically FORTRAN 77 in its clarity and linearity.

    Profiler profiler("SpectrogramLayer::paint", false);

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint(): m_model is " << m_model << ", zoom level is " << v->getZoomLevel() << ", m_updateTimer " << m_updateTimer << std::endl;
    
    std::cerr << "rect is " << rect.x() << "," << rect.y() << " " << rect.width() << "x" << rect.height() << std::endl;
#endif

    long startFrame = v->getStartFrame();
    if (startFrame < 0) m_candidateFillStartFrame = 0;
    else m_candidateFillStartFrame = startFrame;

    if (!m_model || !m_model->isOK() || !m_model->isReady()) {
	return;
    }

    if (isLayerDormant(v)) {
	std::cerr << "SpectrogramLayer::paint(): Layer is dormant, making it undormant again" << std::endl;
    }

    // Need to do this even if !isLayerDormant, as that could mean v
    // is not in the dormancy map at all -- we need it to be present
    // and accountable for when determining whether we need the cache
    // in the cache-fill thread above.
    //!!! no longer use cache-fill thread
    const_cast<SpectrogramLayer *>(this)->Layer::setLayerDormant(v, false);

    size_t fftSize = getFFTSize(v);
    FFTModel *fft = getFFTModel(v);
    if (!fft) {
	std::cerr << "ERROR: SpectrogramLayer::paint(): No FFT model, returning" << std::endl;
	return;
    }

    PixmapCache &cache = m_pixmapCaches[v];

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint(): pixmap cache valid area " << cache.validArea.x() << ", " << cache.validArea.y() << ", " << cache.validArea.width() << "x" << cache.validArea.height() << std::endl;
#endif

#ifdef DEBUG_SPECTROGRAM_REPAINT
    bool stillCacheing = (m_updateTimer != 0);
    std::cerr << "SpectrogramLayer::paint(): Still cacheing = " << stillCacheing << std::endl;
#endif

    int zoomLevel = v->getZoomLevel();

    int x0 = 0;
    int x1 = v->width();

    bool recreateWholePixmapCache = true;

    x0 = rect.left();
    x1 = rect.right() + 1;

    if (cache.validArea.width() > 0) {

	if (int(cache.zoomLevel) == zoomLevel &&
	    cache.pixmap.width() == v->width() &&
	    cache.pixmap.height() == v->height()) {

	    if (v->getXForFrame(cache.startFrame) ==
		v->getXForFrame(startFrame) &&
                cache.validArea.x() <= x0 &&
                cache.validArea.x() + cache.validArea.width() >= x1) {
	    
#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: pixmap cache good" << std::endl;
#endif

		paint.drawPixmap(rect, cache.pixmap, rect);
                illuminateLocalFeatures(v, paint);
		return;

	    } else {

#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: pixmap cache partially OK" << std::endl;
#endif

		recreateWholePixmapCache = false;

		int dx = v->getXForFrame(cache.startFrame) -
		         v->getXForFrame(startFrame);

#ifdef DEBUG_SPECTROGRAM_REPAINT
		std::cerr << "SpectrogramLayer: dx = " << dx << " (pixmap cache " << cache.pixmap.width() << "x" << cache.pixmap.height() << ")" << std::endl;
#endif

		if (dx != 0 &&
                    dx > -cache.pixmap.width() &&
                    dx <  cache.pixmap.width()) {

                    QPixmap tmp = cache.pixmap;
                    QPainter cachePainter(&cache.pixmap);
                    if (dx < 0) {
                        cachePainter.drawPixmap
                            (QRect(0, 0,
                                   cache.pixmap.width() + dx,
                                   cache.pixmap.height()),
                             tmp,
                             QRect(-dx, 0,
                                   cache.pixmap.width() + dx,
                                   cache.pixmap.height()));
                    } else {
                        cachePainter.drawPixmap
                            (QRect(dx, 0,
                                   cache.pixmap.width() - dx,
                                   cache.pixmap.height()),
                             tmp,
                             QRect(0, 0,
                                   cache.pixmap.width() - dx,
                                   cache.pixmap.height()));
                    }

                    int px = cache.validArea.x();
                    int pw = cache.validArea.width();

		    if (dx < 0) {
			x0 = cache.pixmap.width() + dx;
			x1 = cache.pixmap.width();
                        px += dx;
                        if (px < 0) {
                            pw += px;
                            px = 0;
                            if (pw < 0) pw = 0;
                        }
		    } else {
			x0 = 0;
			x1 = dx;
                        px += dx;
                        if (px + pw > cache.pixmap.width()) {
                            pw = int(cache.pixmap.width()) - px;
                            if (pw < 0) pw = 0;
                        }
		    }
                    
                    cache.validArea =
                        QRect(px, cache.validArea.y(),
                              pw, cache.validArea.height());

#ifdef DEBUG_SPECTROGRAM_REPAINT
                    std::cerr << "valid area now "
                              << px << "," << cache.validArea.y()
                              << " " << pw << "x" << cache.validArea.height()
                              << std::endl;
#endif

		    paint.drawPixmap(rect & cache.validArea,
                                     cache.pixmap,
                                     rect & cache.validArea);

                } else if (dx != 0) {

                    // we scrolled too far to be of use

                    cache.validArea = QRect();
                    recreateWholePixmapCache = true;
                }
	    }
	} else {
#ifdef DEBUG_SPECTROGRAM_REPAINT
	    std::cerr << "SpectrogramLayer: pixmap cache useless" << std::endl;
            if (int(cache.zoomLevel) != zoomLevel) {
                std::cerr << "(cache zoomLevel " << cache.zoomLevel
                          << " != " << zoomLevel << ")" << std::endl;
            }
            if (cache.pixmap.width() != v->width()) {
                std::cerr << "(cache width " << cache.pixmap.width()
                          << " != " << v->width();
            }
            if (cache.pixmap.height() != v->height()) {
                std::cerr << "(cache height " << cache.pixmap.height()
                          << " != " << v->height();
            }
#endif
            cache.validArea = QRect();
	}
    }

    if (updateViewMagnitudes(v)) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "SpectrogramLayer: magnitude range changed to [" << m_viewMags[v].getMin() << "->" << m_viewMags[v].getMax() << "]" << std::endl;
#endif
        if (m_normalizeVisibleArea) {
            cache.validArea = QRect();
            recreateWholePixmapCache = true;
        }
    } else {
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "No change in magnitude range [" << m_viewMags[v].getMin() << "->" << m_viewMags[v].getMax() << "]" << std::endl;
#endif
    }

    if (recreateWholePixmapCache) {
        x0 = 0;
        x1 = v->width();
    }

    struct timeval tv;
    (void)gettimeofday(&tv, 0);
    RealTime mainPaintStart = RealTime::fromTimeval(tv);

    int paintBlockWidth = m_lastPaintBlockWidth;

    if (paintBlockWidth == 0) {
        paintBlockWidth = (300000 / zoomLevel);
    } else {
        RealTime lastTime = m_lastPaintTime;
        while (lastTime > RealTime::fromMilliseconds(200) &&
               paintBlockWidth > 50) {
            paintBlockWidth /= 2;
            lastTime = lastTime / 2;
        }
        while (lastTime < RealTime::fromMilliseconds(90) &&
               paintBlockWidth < 1500) {
            paintBlockWidth *= 2;
            lastTime = lastTime * 2;
        }
    }

    if (paintBlockWidth < 20) paintBlockWidth = 20;

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "[" << this << "]: last paint width: " << m_lastPaintBlockWidth << ", last paint time: " << m_lastPaintTime << ", new paint width: " << paintBlockWidth << std::endl;
#endif

    // We always paint the full height when refreshing the cache.
    // Smaller heights can be used when painting direct from cache
    // (further up in this function), but we want to ensure the cache
    // is coherent without having to worry about vertical matching of
    // required and valid areas as well as horizontal.

    int h = v->height();

    if (cache.validArea.width() > 0) {

        // If part of the cache is known to be valid, select a strip
        // immediately to left or right of the valid part

        int vx0 = 0, vx1 = 0;
        vx0 = cache.validArea.x();
        vx1 = cache.validArea.x() + cache.validArea.width();
        
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "x0 " << x0 << ", x1 " << x1 << ", vx0 " << vx0 << ", vx1 " << vx1 << ", paintBlockWidth " << paintBlockWidth << std::endl;
#endif         
        if (x0 < vx0) {
            if (x0 + paintBlockWidth < vx0) {
                x0 = vx0 - paintBlockWidth;
            }
            x1 = vx0;
        } else if (x0 >= vx1) {
            x0 = vx1;
            if (x1 > x0 + paintBlockWidth) {
                x1 = x0 + paintBlockWidth;
            }
        } else {
            // x0 is within the valid area
            if (x1 > vx1) {
                x0 = vx1;
                if (x0 + paintBlockWidth < x1) {
                    x1 = x0 + paintBlockWidth;
                }
            } else {
                x1 = x0; // it's all valid, paint nothing
            }
        }
         
        cache.validArea = QRect
            (std::min(vx0, x0), cache.validArea.y(),
             std::max(vx1 - std::min(vx0, x0),
                      x1 - std::min(vx0, x0)),
             cache.validArea.height());
            
    } else {
        if (x1 > x0 + paintBlockWidth) {
            int sfx = x1;
            if (startFrame < 0) sfx = v->getXForFrame(0);
            if (sfx >= x0 && sfx + paintBlockWidth <= x1) {
                x0 = sfx;
                x1 = x0 + paintBlockWidth;
            } else {
                int mid = (x1 + x0) / 2;
                x0 = mid - paintBlockWidth/2;
                x1 = x0 + paintBlockWidth;
            }
        }
        cache.validArea = QRect(x0, 0, x1 - x0, h);
    }

    int w = x1 - x0;

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "x0 " << x0 << ", x1 " << x1 << ", w " << w << ", h " << h << std::endl;
#endif

    if (m_drawBuffer.width() < w || m_drawBuffer.height() < h) {
        m_drawBuffer = QImage(w, h, QImage::Format_RGB32);
    }

    m_drawBuffer.fill(m_palette.getColour(0).rgb());

    int sr = m_model->getSampleRate();

    // Set minFreq and maxFreq to the frequency extents of the possibly
    // zero-padded visible bin range, and displayMinFreq and displayMaxFreq
    // to the actual scale frequency extents (presumably not zero padded).

    // If we are zero padding, we want to use the zero-padded
    // equivalents of the bins that we would be using if not zero
    // padded, to avoid spaces at the top and bottom of the display.

    // Note fftSize is the actual zero-padded fft size, m_fftSize the
    // nominal fft size.
    
    size_t maxbin = m_fftSize / 2;
    if (m_maxFrequency > 0) {
	maxbin = int((double(m_maxFrequency) * m_fftSize) / sr + 0.001);
	if (maxbin > m_fftSize / 2) maxbin = m_fftSize / 2;
    }

    size_t minbin = 1;
    if (m_minFrequency > 0) {
	minbin = int((double(m_minFrequency) * m_fftSize) / sr + 0.001);
//        std::cerr << "m_minFrequency = " << m_minFrequency << " -> minbin = " << minbin << std::endl;
	if (minbin < 1) minbin = 1;
	if (minbin >= maxbin) minbin = maxbin - 1;
    }

    int zpl = getZeroPadLevel(v) + 1;
    minbin = minbin * zpl;
    maxbin = (maxbin + 1) * zpl - 1;

    float minFreq = (float(minbin) * sr) / fftSize;
    float maxFreq = (float(maxbin) * sr) / fftSize;

    float displayMinFreq = minFreq;
    float displayMaxFreq = maxFreq;

    if (fftSize != m_fftSize) {
        displayMinFreq = getEffectiveMinFrequency();
        displayMaxFreq = getEffectiveMaxFrequency();
    }

//    std::cerr << "(giving actual minFreq " << minFreq << " and display minFreq " << displayMinFreq << ")" << std::endl;

    float ymag[h];
    float ydiv[h];
    float yval[maxbin + 1]; //!!! cache this?

    size_t increment = getWindowIncrement();
    
    bool logarithmic = (m_frequencyScale == LogFrequencyScale);

    for (size_t q = minbin; q <= maxbin; ++q) {
        float f0 = (float(q) * sr) / fftSize;
        yval[q] = v->getYForFrequency(f0, displayMinFreq, displayMaxFreq,
                                      logarithmic);
//        std::cerr << "min: " << minFreq << ", max: " << maxFreq << ", yval[" << q << "]: " << yval[q] << std::endl;
    }

    MagnitudeRange overallMag = m_viewMags[v];
    bool overallMagChanged = false;

    bool fftSuspended = false;

    bool interpolate = false;
    Preferences::SpectrogramSmoothing smoothing = 
        Preferences::getInstance()->getSpectrogramSmoothing();
    if (smoothing == Preferences::SpectrogramInterpolated ||
        smoothing == Preferences::SpectrogramZeroPaddedAndInterpolated) {
        if (m_binDisplay != PeakBins &&
            m_binDisplay != PeakFrequencies) {
            interpolate = true;
        }
    }

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << ((float(v->getFrameForX(1) - v->getFrameForX(0))) / increment) << " bin(s) per pixel" << std::endl;
#endif

    bool runOutOfData = false;

    if (w == 0) {
        std::cerr << "*** NOTE: w == 0" << std::endl;
    }

#ifdef DEBUG_SPECTROGRAM_REPAINT
    size_t pixels = 0;
#endif

    for (int x = 0; x < w; ++x) {

        if (runOutOfData) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "Run out of data -- dropping out of loop" << std::endl;
#endif
            break;
        }

	for (int y = 0; y < h; ++y) {
	    ymag[y] = 0.f;
	    ydiv[y] = 0.f;
	}

	float s0 = 0, s1 = 0;

	if (!getXBinRange(v, x0 + x, s0, s1)) {
	    assert(x <= m_drawBuffer.width());
	    continue;
	}

	int s0i = int(s0 + 0.001);
	int s1i = int(s1);

	if (s1i >= int(fft->getWidth())) {
	    if (s0i >= int(fft->getWidth())) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
                std::cerr << "Column " << s0i << " out of range" << std::endl;
#endif
		continue;
	    } else {
		s1i = s0i;
	    }
	}

        for (int s = s0i; s <= s1i; ++s) {

            if (!fft->isColumnAvailable(s)) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
                std::cerr << "Met unavailable column at col " << s << std::endl;
#endif
//                continue;
                runOutOfData = true;
                break;
            }
            
            if (!fftSuspended) {
                fft->suspendWrites();
                fftSuspended = true;
            }

            MagnitudeRange mag;

            FFTModel::PeakSet peaks;
            if (m_binDisplay == PeakFrequencies &&
                s < int(fft->getWidth()) - 1) {
                peaks = fft->getPeakFrequencies(FFTModel::AllPeaks,
                                                s,
                                                minbin, maxbin - 1);
            }

            for (size_t q = minbin; q < maxbin; ++q) {

                float y0 = yval[q + 1];
                float y1 = yval[q];

		if (m_binDisplay == PeakBins) {
		    if (!fft->isLocalPeak(s, q)) continue;
		}
                if (m_binDisplay == PeakFrequencies) {
                    if (peaks.find(q) == peaks.end()) continue;
                }

                if (m_threshold != 0.f &&
                    !fft->isOverThreshold(s, q, m_threshold * (m_fftSize/2))) {
                    continue;
                }

		float sprop = 1.0;
		if (s == s0i) sprop *= (s + 1) - s0;
		if (s == s1i) sprop *= s1 - s;
 
		if (m_binDisplay == PeakFrequencies) {
		    y0 = y1 = v->getYForFrequency
			(peaks[q], displayMinFreq, displayMaxFreq, logarithmic);
		}
		
		int y0i = int(y0 + 0.001);
		int y1i = int(y1);

                float value;
                
                if (m_colourScale == PhaseColourScale) {
                    value = fft->getPhaseAt(s, q);
                } else if (m_normalizeColumns) {
                    value = fft->getNormalizedMagnitudeAt(s, q);
                    mag.sample(value);
                    value *= m_gain;
                } else {
                    value = fft->getMagnitudeAt(s, q) / (m_fftSize/2);
                    mag.sample(value);
                    value *= m_gain;
                }

                if (interpolate) {
                    
                    int ypi = y0i;
                    if (q < maxbin - 1) ypi = int(yval[q + 2]);

                    for (int y = ypi; y <= y1i; ++y) {
                    
                        if (y < 0 || y >= h) continue;
                    
                        float yprop = sprop;
                        float iprop = yprop;

                        if (ypi < y0i && y <= y0i) {

                            float half = float(y0i - ypi) / 2;
                            float dist = y - (ypi + half);

                            if (dist >= 0) {
                                iprop = (iprop * dist) / half;
                                ymag[y] += iprop * value;
                            }
                        } else {
                            if (y1i > y0i) {

                                float half = float(y1i - y0i) / 2;
                                float dist = y - (y0i + half);
                                
                                if (dist >= 0) {
                                    iprop = (iprop * (half - dist)) / half;
                                }
                            }

                            ymag[y] += iprop * value;
                            ydiv[y] += yprop;
                        }
                    }

                } else {

                    for (int y = y0i; y <= y1i; ++y) {
                    
                        if (y < 0 || y >= h) continue;
                    
                        float yprop = sprop;
                        if (y == y0i) yprop *= (y + 1) - y0;
                        if (y == y1i) yprop *= y1 - y;

                        for (int y = y0i; y <= y1i; ++y) {
		    
                            if (y < 0 || y >= h) continue;

                            float yprop = sprop;
                            if (y == y0i) yprop *= (y + 1) - y0;
                            if (y == y1i) yprop *= y1 - y;
                            ymag[y] += yprop * value;
                            ydiv[y] += yprop;
                        }
                    }
                }
	    }

            if (mag.isSet()) {

                if (s >= int(m_columnMags.size())) {
                    std::cerr << "INTERNAL ERROR: " << s << " >= "
                              << m_columnMags.size() << " at SpectrogramLayer.cpp:2087" << std::endl;
                }

                m_columnMags[s].sample(mag);

                if (overallMag.sample(mag)) {
                    //!!! scaling would change here
                    overallMagChanged = true;
#ifdef DEBUG_SPECTROGRAM_REPAINT
                    std::cerr << "Overall mag changed (again?) at column " << s << ", to [" << overallMag.getMin() << "->" << overallMag.getMax() << "]" << std::endl;
#endif
                }
            }
	}

	for (int y = 0; y < h; ++y) {

	    if (ydiv[y] > 0.0) {

		unsigned char pixel = 0;

		float avg = ymag[y] / ydiv[y];
		pixel = getDisplayValue(v, avg);

		assert(x <= m_drawBuffer.width());
		QColor c = m_palette.getColour(pixel);
		m_drawBuffer.setPixel(x, y,
                                      qRgb(c.red(), c.green(), c.blue()));
#ifdef DEBUG_SPECTROGRAM_REPAINT
                ++pixels;
#endif
	    }
	}
    }

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << pixels << " pixels drawn" << std::endl;
#endif

    if (overallMagChanged) {
        m_viewMags[v] = overallMag;
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "Overall mag is now [" << m_viewMags[v].getMin() << "->" << m_viewMags[v].getMax() << "] - will be updating" << std::endl;
#endif
    } else {
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "Overall mag unchanged at [" << m_viewMags[v].getMin() << "->" << m_viewMags[v].getMax() << "]" << std::endl;
#endif
    }

    Profiler profiler2("SpectrogramLayer::paint: draw image", true);

    if (w > 0) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "Painting " << w << "x" << rect.height()
                  << " from draw buffer at " << 0 << "," << rect.y()
                  << " to window at " << x0 << "," << rect.y() << std::endl;
#endif

        paint.drawImage(x0, rect.y(), m_drawBuffer,
                        0, rect.y(), w, rect.height());
    }

    if (recreateWholePixmapCache) {
        std::cerr << "Recreating pixmap cache: width = " << v->width()
                  << ", height = " << h << std::endl;
	cache.pixmap = QPixmap(v->width(), h);
    }

    if (w > 0) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
        std::cerr << "Painting " << w << "x" << h
                  << " from draw buffer at " << 0 << "," << 0
                  << " to cache at " << x0 << "," << 0 << std::endl;
#endif

        QPainter cachePainter(&cache.pixmap);
        cachePainter.drawImage(x0, 0, m_drawBuffer, 0, 0, w, h);
        cachePainter.end();
    }

    cache.startFrame = startFrame;
    cache.zoomLevel = zoomLevel;

    if (!m_normalizeVisibleArea || !overallMagChanged) {
    
        if (cache.validArea.x() > 0) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "SpectrogramLayer::paint() updating left (0, "
                      << cache.validArea.x() << ")" << std::endl;
#endif
            v->update(0, 0, cache.validArea.x(), h);
        }
        
        if (cache.validArea.x() + cache.validArea.width() <
            cache.pixmap.width()) {
#ifdef DEBUG_SPECTROGRAM_REPAINT
            std::cerr << "SpectrogramLayer::paint() updating right ("
                      << cache.validArea.x() + cache.validArea.width()
                      << ", "
                      << cache.pixmap.width() - (cache.validArea.x() +
                                                 cache.validArea.width())
                      << ")" << std::endl;
#endif
            v->update(cache.validArea.x() + cache.validArea.width(),
                      0,
                      cache.pixmap.width() - (cache.validArea.x() +
                                              cache.validArea.width()),
                      h);
        }
    } else {
        // overallMagChanged
        std::cerr << "\noverallMagChanged - updating all\n" << std::endl;
        cache.validArea = QRect();
        v->update();
    }

    illuminateLocalFeatures(v, paint);

#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::paint() returning" << std::endl;
#endif

    m_lastPaintBlockWidth = paintBlockWidth;
    (void)gettimeofday(&tv, 0);
    m_lastPaintTime = RealTime::fromTimeval(tv) - mainPaintStart;

    if (fftSuspended) fft->resume();
}

void
SpectrogramLayer::illuminateLocalFeatures(View *v, QPainter &paint) const
{
    QPoint localPos;
    if (!v->shouldIlluminateLocalFeatures(this, localPos) || !m_model) {
        return;
    }

//    std::cerr << "SpectrogramLayer: illuminateLocalFeatures("
//              << localPos.x() << "," << localPos.y() << ")" << std::endl;

    float s0, s1;
    float f0, f1;

    if (getXBinRange(v, localPos.x(), s0, s1) &&
        getYBinSourceRange(v, localPos.y(), f0, f1)) {
        
        int s0i = int(s0 + 0.001);
        int s1i = int(s1);
        
        int x0 = v->getXForFrame(s0i * getWindowIncrement());
        int x1 = v->getXForFrame((s1i + 1) * getWindowIncrement());

        int y1 = int(getYForFrequency(v, f1));
        int y0 = int(getYForFrequency(v, f0));
        
//        std::cerr << "SpectrogramLayer: illuminate "
//                  << x0 << "," << y1 << " -> " << x1 << "," << y0 << std::endl;
        
        paint.setPen(v->getForeground());

        //!!! should we be using paintCrosshairs for this?

        paint.drawRect(x0, y1, x1 - x0 + 1, y0 - y1 + 1);
    }
}

float
SpectrogramLayer::getYForFrequency(const View *v, float frequency) const
{
    return v->getYForFrequency(frequency,
			       getEffectiveMinFrequency(),
			       getEffectiveMaxFrequency(),
			       m_frequencyScale == LogFrequencyScale);
}

float
SpectrogramLayer::getFrequencyForY(const View *v, int y) const
{
    return v->getFrequencyForY(y,
			       getEffectiveMinFrequency(),
			       getEffectiveMaxFrequency(),
			       m_frequencyScale == LogFrequencyScale);
}

int
SpectrogramLayer::getCompletion(View *v) const
{
    if (m_updateTimer == 0) return 100;
    if (m_fftModels.find(v) == m_fftModels.end()) return 100;

    size_t completion = m_fftModels[v].first->getCompletion();
#ifdef DEBUG_SPECTROGRAM_REPAINT
    std::cerr << "SpectrogramLayer::getCompletion: completion = " << completion << std::endl;
#endif
    return completion;
}

bool
SpectrogramLayer::getValueExtents(float &min, float &max,
                                  bool &logarithmic, QString &unit) const
{
    if (!m_model) return false;

    int sr = m_model->getSampleRate();
    min = float(sr) / m_fftSize;
    max = float(sr) / 2;
    
    logarithmic = (m_frequencyScale == LogFrequencyScale);
    unit = "Hz";
    return true;
}

bool
SpectrogramLayer::getDisplayExtents(float &min, float &max) const
{
    min = getEffectiveMinFrequency();
    max = getEffectiveMaxFrequency();

//    std::cerr << "SpectrogramLayer::getDisplayExtents: " << min << "->" << max << std::endl;
    return true;
}    

bool
SpectrogramLayer::setDisplayExtents(float min, float max)
{
    if (!m_model) return false;

//    std::cerr << "SpectrogramLayer::setDisplayExtents: " << min << "->" << max << std::endl;

    if (min < 0) min = 0;
    if (max > m_model->getSampleRate()/2) max = m_model->getSampleRate()/2;
    
    size_t minf = lrintf(min);
    size_t maxf = lrintf(max);

    if (m_minFrequency == minf && m_maxFrequency == maxf) return true;

    invalidatePixmapCaches();
    invalidateMagnitudes();

    m_minFrequency = minf;
    m_maxFrequency = maxf;
    
    emit layerParametersChanged();

    int vs = getCurrentVerticalZoomStep();
    if (vs != m_lastEmittedZoomStep) {
        emit verticalZoomChanged();
        m_lastEmittedZoomStep = vs;
    }

    return true;
}

bool
SpectrogramLayer::getYScaleValue(const View *v, int y,
                                 float &value, QString &unit) const
{
    value = getFrequencyForY(v, y);
    unit = "Hz";
    return true;
}

bool
SpectrogramLayer::snapToFeatureFrame(View *, int &frame,
				     size_t &resolution,
				     SnapType snap) const
{
    resolution = getWindowIncrement();
    int left = (frame / resolution) * resolution;
    int right = left + resolution;

    switch (snap) {
    case SnapLeft:  frame = left;  break;
    case SnapRight: frame = right; break;
    case SnapNearest:
    case SnapNeighbouring:
	if (frame - left > right - frame) frame = right;
	else frame = left;
	break;
    }
    
    return true;
} 

void
SpectrogramLayer::measureDoubleClick(View *v, QMouseEvent *e)
{
    PixmapCache &cache = m_pixmapCaches[v];

    std::cerr << "cache width: " << cache.pixmap.width() << ", height: "
              << cache.pixmap.height() << std::endl;

    QImage image = cache.pixmap.toImage();

    ImageRegionFinder finder;
    QRect rect = finder.findRegionExtents(&image, e->pos());
    if (rect.isValid()) {
        MeasureRect mr;
        setMeasureRectFromPixrect(v, mr, rect);
        CommandHistory::getInstance()->addCommand
            (new AddMeasurementRectCommand(this, mr));
    }
}

bool
SpectrogramLayer::getCrosshairExtents(View *v, QPainter &paint,
                                      QPoint cursorPos,
                                      std::vector<QRect> &extents) const
{
    QRect vertical(cursorPos.x() - 12, 0, 12, v->height());
    extents.push_back(vertical);

    QRect horizontal(0, cursorPos.y(), cursorPos.x(), 1);
    extents.push_back(horizontal);

    int sw = getVerticalScaleWidth(v, paint);

    QRect freq(sw, cursorPos.y() - paint.fontMetrics().ascent() - 2,
               paint.fontMetrics().width("123456 Hz") + 2,
               paint.fontMetrics().height());
    extents.push_back(freq);

    QRect pitch(sw, cursorPos.y() + 2,
                paint.fontMetrics().width("C#10+50c") + 2,
                paint.fontMetrics().height());
    extents.push_back(pitch);

    QRect rt(cursorPos.x(),
             v->height() - paint.fontMetrics().height() - 2,
             paint.fontMetrics().width("1234.567 s"),
             paint.fontMetrics().height());
    extents.push_back(rt);

    int w(paint.fontMetrics().width("1234567890") + 2);
    QRect frame(cursorPos.x() - w - 2,
                v->height() - paint.fontMetrics().height() - 2,
                w,
                paint.fontMetrics().height());
    extents.push_back(frame);

    return true;
}

void
SpectrogramLayer::paintCrosshairs(View *v, QPainter &paint,
                                  QPoint cursorPos) const
{
    paint.save();

    int sw = getVerticalScaleWidth(v, paint);

    QFont fn = paint.font();
    if (fn.pointSize() > 8) {
        fn.setPointSize(fn.pointSize() - 1);
        paint.setFont(fn);
    }
    paint.setPen(m_crosshairColour);

    paint.drawLine(0, cursorPos.y(), cursorPos.x() - 1, cursorPos.y());
    paint.drawLine(cursorPos.x(), 0, cursorPos.x(), v->height());
    
    float fundamental = getFrequencyForY(v, cursorPos.y());

    v->drawVisibleText(paint,
                       sw + 2,
                       cursorPos.y() - 2,
                       QString("%1 Hz").arg(fundamental),
                       View::OutlinedText);

    if (Pitch::isFrequencyInMidiRange(fundamental)) {
        QString pitchLabel = Pitch::getPitchLabelForFrequency(fundamental);
        v->drawVisibleText(paint,
                           sw + 2,
                           cursorPos.y() + paint.fontMetrics().ascent() + 2,
                           pitchLabel,
                           View::OutlinedText);
    }

    long frame = v->getFrameForX(cursorPos.x());
    RealTime rt = RealTime::frame2RealTime(frame, m_model->getSampleRate());
    QString rtLabel = QString("%1 s").arg(rt.toText(true).c_str());
    QString frameLabel = QString("%1").arg(frame);
    v->drawVisibleText(paint,
                       cursorPos.x() - paint.fontMetrics().width(frameLabel) - 2,
                       v->height() - 2,
                       frameLabel,
                       View::OutlinedText);
    v->drawVisibleText(paint,
                       cursorPos.x() + 2,
                       v->height() - 2,
                       rtLabel,
                       View::OutlinedText);

    int harmonic = 2;

    while (harmonic < 100) {

        float hy = lrintf(getYForFrequency(v, fundamental * harmonic));
        if (hy < 0 || hy > v->height()) break;
        
        int len = 7;

        if (harmonic % 2 == 0) {
            if (harmonic % 4 == 0) {
                len = 12;
            } else {
                len = 10;
            }
        }

        paint.drawLine(cursorPos.x() - len,
                       int(hy),
                       cursorPos.x(),
                       int(hy));

        ++harmonic;
    }

    paint.restore();
}

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

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

    float magMin = 0, magMax = 0;
    float phaseMin = 0, phaseMax = 0;
    float freqMin = 0, freqMax = 0;
    float adjFreqMin = 0, adjFreqMax = 0;
    QString pitchMin, pitchMax;
    RealTime rtMin, rtMax;

    bool haveValues = false;

    if (!getXBinSourceRange(v, x, rtMin, rtMax)) {
	return "";
    }
    if (getXYBinSourceRange(v, x, y, magMin, magMax, phaseMin, phaseMax)) {
	haveValues = true;
    }

    QString adjFreqText = "", adjPitchText = "";

    if (m_binDisplay == PeakFrequencies) {

	if (!getAdjustedYBinSourceRange(v, x, y, freqMin, freqMax,
					adjFreqMin, adjFreqMax)) {
	    return "";
	}

	if (adjFreqMin != adjFreqMax) {
	    adjFreqText = tr("Peak Frequency:\t%1 - %2 Hz\n")
		.arg(adjFreqMin).arg(adjFreqMax);
	} else {
	    adjFreqText = tr("Peak Frequency:\t%1 Hz\n")
		.arg(adjFreqMin);
	}

	QString pmin = Pitch::getPitchLabelForFrequency(adjFreqMin);
	QString pmax = Pitch::getPitchLabelForFrequency(adjFreqMax);

	if (pmin != pmax) {
	    adjPitchText = tr("Peak Pitch:\t%3 - %4\n").arg(pmin).arg(pmax);
	} else {
	    adjPitchText = tr("Peak Pitch:\t%2\n").arg(pmin);
	}

    } else {
	
	if (!getYBinSourceRange(v, y, freqMin, freqMax)) return "";
    }

    QString text;

    if (rtMin != rtMax) {
	text += tr("Time:\t%1 - %2\n")
	    .arg(rtMin.toText(true).c_str())
	    .arg(rtMax.toText(true).c_str());
    } else {
	text += tr("Time:\t%1\n")
	    .arg(rtMin.toText(true).c_str());
    }

    if (freqMin != freqMax) {
	text += tr("%1Bin Frequency:\t%2 - %3 Hz\n%4Bin Pitch:\t%5 - %6\n")
	    .arg(adjFreqText)
	    .arg(freqMin)
	    .arg(freqMax)
	    .arg(adjPitchText)
	    .arg(Pitch::getPitchLabelForFrequency(freqMin))
	    .arg(Pitch::getPitchLabelForFrequency(freqMax));
    } else {
	text += tr("%1Bin Frequency:\t%2 Hz\n%3Bin Pitch:\t%4\n")
	    .arg(adjFreqText)
	    .arg(freqMin)
	    .arg(adjPitchText)
	    .arg(Pitch::getPitchLabelForFrequency(freqMin));
    }	

    if (haveValues) {
	float dbMin = AudioLevel::multiplier_to_dB(magMin);
	float dbMax = AudioLevel::multiplier_to_dB(magMax);
	QString dbMinString;
	QString dbMaxString;
	if (dbMin == AudioLevel::DB_FLOOR) {
	    dbMinString = tr("-Inf");
	} else {
	    dbMinString = QString("%1").arg(lrintf(dbMin));
	}
	if (dbMax == AudioLevel::DB_FLOOR) {
	    dbMaxString = tr("-Inf");
	} else {
	    dbMaxString = QString("%1").arg(lrintf(dbMax));
	}
	if (lrintf(dbMin) != lrintf(dbMax)) {
	    text += tr("dB:\t%1 - %2").arg(dbMinString).arg(dbMaxString);
	} else {
	    text += tr("dB:\t%1").arg(dbMinString);
	}
	if (phaseMin != phaseMax) {
	    text += tr("\nPhase:\t%1 - %2").arg(phaseMin).arg(phaseMax);
	} else {
	    text += tr("\nPhase:\t%1").arg(phaseMin);
	}
    }

    return text;
}

int
SpectrogramLayer::getColourScaleWidth(QPainter &paint) const
{
    int cw;

    cw = paint.fontMetrics().width("-80dB");

    return cw;
}

int
SpectrogramLayer::getVerticalScaleWidth(View *, QPainter &paint) const
{
    if (!m_model || !m_model->isOK()) return 0;

    int cw = getColourScaleWidth(paint);

    int tw = paint.fontMetrics().width(QString("%1")
				     .arg(m_maxFrequency > 0 ?
					  m_maxFrequency - 1 :
					  m_model->getSampleRate() / 2));

    int fw = paint.fontMetrics().width(tr("43Hz"));
    if (tw < fw) tw = fw;

    int tickw = (m_frequencyScale == LogFrequencyScale ? 10 : 4);
    
    return cw + tickw + tw + 13;
}

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

    Profiler profiler("SpectrogramLayer::paintVerticalScale", true);

    //!!! cache this?

    int h = rect.height(), w = rect.width();

    int tickw = (m_frequencyScale == LogFrequencyScale ? 10 : 4);
    int pkw = (m_frequencyScale == LogFrequencyScale ? 10 : 0);

    size_t bins = m_fftSize / 2;
    int sr = m_model->getSampleRate();

    if (m_maxFrequency > 0) {
	bins = int((double(m_maxFrequency) * m_fftSize) / sr + 0.1);
	if (bins > m_fftSize / 2) bins = m_fftSize / 2;
    }

    int cw = getColourScaleWidth(paint);
    int cbw = paint.fontMetrics().width("dB");

    int py = -1;
    int textHeight = paint.fontMetrics().height();
    int toff = -textHeight + paint.fontMetrics().ascent() + 2;

    if (h > textHeight * 3 + 10) {

        int topLines = 2;
        if (m_colourScale == PhaseColourScale) topLines = 1;

	int ch = h - textHeight * (topLines + 1) - 8;
//	paint.drawRect(4, textHeight + 4, cw - 1, ch + 1);
	paint.drawRect(4 + cw - cbw, textHeight * topLines + 4, cbw - 1, ch + 1);

	QString top, bottom;
        float min = m_viewMags[v].getMin();
        float max = m_viewMags[v].getMax();

        float dBmin = AudioLevel::multiplier_to_dB(min);
        float dBmax = AudioLevel::multiplier_to_dB(max);

        if (dBmax < -60.f) dBmax = -60.f;
        else top = QString("%1").arg(lrintf(dBmax));

        if (dBmin < dBmax - 60.f) dBmin = dBmax - 60.f;
        bottom = QString("%1").arg(lrintf(dBmin));

        //!!! & phase etc

        if (m_colourScale != PhaseColourScale) {
            paint.drawText((cw + 6 - paint.fontMetrics().width("dBFS")) / 2,
                           2 + textHeight + toff, "dBFS");
        }

//	paint.drawText((cw + 6 - paint.fontMetrics().width(top)) / 2,
	paint.drawText(3 + cw - cbw - paint.fontMetrics().width(top),
		       2 + textHeight * topLines + toff + textHeight/2, top);

	paint.drawText(3 + cw - cbw - paint.fontMetrics().width(bottom),
		       h + toff - 3 - textHeight/2, bottom);

	paint.save();
	paint.setBrush(Qt::NoBrush);

        int lasty = 0;
        int lastdb = 0;

	for (int i = 0; i < ch; ++i) {

            float dBval = dBmin + (((dBmax - dBmin) * i) / (ch - 1));
            int idb = int(dBval);

            float value = AudioLevel::dB_to_multiplier(dBval);
            int colour = getDisplayValue(v, value * m_gain);

	    paint.setPen(m_palette.getColour(colour));

            int y = textHeight * topLines + 4 + ch - i;

            paint.drawLine(5 + cw - cbw, y, cw + 2, y);

            if (i == 0) {
                lasty = y;
                lastdb = idb;
            } else if (i < ch - paint.fontMetrics().ascent() &&
                       idb != lastdb &&
                       ((abs(y - lasty) > textHeight && 
                         idb % 10 == 0) ||
                        (abs(y - lasty) > paint.fontMetrics().ascent() && 
                         idb % 5 == 0))) {
                paint.setPen(v->getBackground());
                QString text = QString("%1").arg(idb);
                paint.drawText(3 + cw - cbw - paint.fontMetrics().width(text),
                               y + toff + textHeight/2, text);
                paint.setPen(v->getForeground());
                paint.drawLine(5 + cw - cbw, y, 8 + cw - cbw, y);
                lasty = y;
                lastdb = idb;
            }
	}
	paint.restore();
    }

    paint.drawLine(cw + 7, 0, cw + 7, h);

    int bin = -1;

    for (int y = 0; y < v->height(); ++y) {

	float q0, q1;
	if (!getYBinRange(v, v->height() - y, q0, q1)) continue;

	int vy;

	if (int(q0) > bin) {
	    vy = y;
	    bin = int(q0);
	} else {
	    continue;
	}

	int freq = (sr * bin) / m_fftSize;

	if (py >= 0 && (vy - py) < textHeight - 1) {
	    if (m_frequencyScale == LinearFrequencyScale) {
		paint.drawLine(w - tickw, h - vy, w, h - vy);
	    }
	    continue;
	}

	QString text = QString("%1").arg(freq);
	if (bin == 1) text = tr("%1Hz").arg(freq); // bin 0 is DC
	paint.drawLine(cw + 7, h - vy, w - pkw - 1, h - vy);

	if (h - vy - textHeight >= -2) {
	    int tx = w - 3 - paint.fontMetrics().width(text) - std::max(tickw, pkw);
	    paint.drawText(tx, h - vy + toff, text);
	}

	py = vy;
    }

    if (m_frequencyScale == LogFrequencyScale) {

        // piano keyboard

	paint.drawLine(w - pkw - 1, 0, w - pkw - 1, h);

	float minf = getEffectiveMinFrequency();
	float maxf = getEffectiveMaxFrequency();

	int py = h, ppy = h;
	paint.setBrush(paint.pen().color());

	for (int i = 0; i < 128; ++i) {

	    float f = Pitch::getFrequencyForPitch(i);
	    int y = lrintf(v->getYForFrequency(f, minf, maxf, true));

            if (y < -2) break;
            if (y > h + 2) {
                continue;
            }

	    int n = (i % 12);

            if (n == 1) {
                // C# -- fill the C from here
                QColor col = Qt::gray;
                if (i == 61) { // filling middle C
                    col = Qt::blue;
                    col = col.light(150);
                }
                if (ppy - y > 2) {
                    paint.fillRect(w - pkw,
                                   y,
                                   pkw,
                                   (py + ppy) / 2 - y,
                                   col);
                }
            }

	    if (n == 1 || n == 3 || n == 6 || n == 8 || n == 10) {
		// black notes
		paint.drawLine(w - pkw, y, w, y);
		int rh = ((py - y) / 4) * 2;
		if (rh < 2) rh = 2;
		paint.drawRect(w - pkw, y - (py-y)/4, pkw/2, rh);
	    } else if (n == 0 || n == 5) {
		// C, F
		if (py < h) {
		    paint.drawLine(w - pkw, (y + py) / 2, w, (y + py) / 2);
		}
	    }

            ppy = py;
	    py = y;
	}
    }
}

class SpectrogramRangeMapper : public RangeMapper
{
public:
    SpectrogramRangeMapper(int sr, int /* fftsize */) :
        m_dist(float(sr) / 2),
        m_s2(sqrtf(sqrtf(2))) { }
    ~SpectrogramRangeMapper() { }
    
    virtual int getPositionForValue(float value) const {

        float dist = m_dist;
    
        int n = 0;

        while (dist > (value + 0.00001) && dist > 0.1f) {
            dist /= m_s2;
            ++n;
        }

        return n;
    }

    virtual float getValueForPosition(int position) const {

        // Vertical zoom step 0 shows the entire range from DC ->
        // Nyquist frequency.  Step 1 shows 2^(1/4) of the range of
        // step 0, and so on until the visible range is smaller than
        // the frequency step between bins at the current fft size.

        float dist = m_dist;
    
        int n = 0;
        while (n < position) {
            dist /= m_s2;
            ++n;
        }

        return dist;
    }
    
    virtual QString getUnit() const { return "Hz"; }

protected:
    float m_dist;
    float m_s2;
};

int
SpectrogramLayer::getVerticalZoomSteps(int &defaultStep) const
{
    if (!m_model) return 0;

    int sr = m_model->getSampleRate();

    SpectrogramRangeMapper mapper(sr, m_fftSize);

//    int maxStep = mapper.getPositionForValue((float(sr) / m_fftSize) + 0.001);
    int maxStep = mapper.getPositionForValue(0);
    int minStep = mapper.getPositionForValue(float(sr) / 2);

    size_t initialMax = m_initialMaxFrequency;
    if (initialMax == 0) initialMax = sr / 2;

    defaultStep = mapper.getPositionForValue(initialMax) - minStep;

//    std::cerr << "SpectrogramLayer::getVerticalZoomSteps: " << maxStep - minStep << " (" << maxStep <<"-" << minStep << "), default is " << defaultStep << " (from initial max freq " << initialMax << ")" << std::endl;

    return maxStep - minStep;
}

int
SpectrogramLayer::getCurrentVerticalZoomStep() const
{
    if (!m_model) return 0;

    float dmin, dmax;
    getDisplayExtents(dmin, dmax);
    
    SpectrogramRangeMapper mapper(m_model->getSampleRate(), m_fftSize);
    int n = mapper.getPositionForValue(dmax - dmin);
//    std::cerr << "SpectrogramLayer::getCurrentVerticalZoomStep: " << n << std::endl;
    return n;
}

void
SpectrogramLayer::setVerticalZoomStep(int step)
{
    if (!m_model) return;

    float dmin = m_minFrequency, dmax = m_maxFrequency;
//    getDisplayExtents(dmin, dmax);

//    std::cerr << "current range " << dmin << " -> " << dmax << ", range " << dmax-dmin << ", mid " << (dmax + dmin)/2 << std::endl;
    
    int sr = m_model->getSampleRate();
    SpectrogramRangeMapper mapper(sr, m_fftSize);
    float newdist = mapper.getValueForPosition(step);

    float newmin, newmax;

    if (m_frequencyScale == LogFrequencyScale) {

        // need to pick newmin and newmax such that
        //
        // (log(newmin) + log(newmax)) / 2 == logmid
        // and
        // newmax - newmin = newdist
        //
        // so log(newmax - newdist) + log(newmax) == 2logmid
        // log(newmax(newmax - newdist)) == 2logmid
        // newmax.newmax - newmax.newdist == exp(2logmid)
        // newmax^2 + (-newdist)newmax + -exp(2logmid) == 0
        // quadratic with a = 1, b = -newdist, c = -exp(2logmid), all known
        // 
        // positive root
        // newmax = (newdist + sqrt(newdist^2 + 4exp(2logmid))) / 2
        //
        // but logmid = (log(dmin) + log(dmax)) / 2
        // so exp(2logmid) = exp(log(dmin) + log(dmax))
        // = exp(log(dmin.dmax))
        // = dmin.dmax
        // so newmax = (newdist + sqrtf(newdist^2 + 4dmin.dmax)) / 2

        newmax = (newdist + sqrtf(newdist*newdist + 4*dmin*dmax)) / 2;
        newmin = newmax - newdist;

//        std::cerr << "newmin = " << newmin << ", newmax = " << newmax << std::endl;

    } else {
        float dmid = (dmax + dmin) / 2;
        newmin = dmid - newdist / 2;
        newmax = dmid + newdist / 2;
    }

    float mmin, mmax;
    mmin = 0;
    mmax = float(sr) / 2;
    
    if (newmin < mmin) {
        newmax += (mmin - newmin);
        newmin = mmin;
    }
    if (newmax > mmax) {
        newmax = mmax;
    }
    
//    std::cerr << "SpectrogramLayer::setVerticalZoomStep: " << step << ": " << newmin << " -> " << newmax << " (range " << newdist << ")" << std::endl;

    setMinFrequency(lrintf(newmin));
    setMaxFrequency(lrintf(newmax));
}

RangeMapper *
SpectrogramLayer::getNewVerticalZoomRangeMapper() const
{
    if (!m_model) return 0;
    return new SpectrogramRangeMapper(m_model->getSampleRate(), m_fftSize);
}

void
SpectrogramLayer::updateMeasureRectYCoords(View *v, const MeasureRect &r) const
{
    int y0 = 0;
    if (r.startY > 0.0) y0 = getYForFrequency(v, r.startY);
    
    int y1 = y0;
    if (r.endY > 0.0) y1 = getYForFrequency(v, r.endY);

//    std::cerr << "SpectrogramLayer::updateMeasureRectYCoords: start " << r.startY << " -> " << y0 << ", end " << r.endY << " -> " << y1 << std::endl;

    r.pixrect = QRect(r.pixrect.x(), y0, r.pixrect.width(), y1 - y0);
}

void
SpectrogramLayer::setMeasureRectYCoord(View *v, MeasureRect &r, bool start, int y) const
{
    if (start) {
        r.startY = getFrequencyForY(v, y);
        r.endY = r.startY;
    } else {
        r.endY = getFrequencyForY(v, y);
    }
//    std::cerr << "SpectrogramLayer::setMeasureRectYCoord: start " << r.startY << " <- " << y << ", end " << r.endY << " <- " << y << std::endl;

}

void
SpectrogramLayer::toXml(QTextStream &stream,
                        QString indent, QString extraAttributes) const
{
    QString s;
    
    s += QString("channel=\"%1\" "
		 "windowSize=\"%2\" "
		 "windowHopLevel=\"%3\" "
		 "gain=\"%4\" "
		 "threshold=\"%5\" ")
	.arg(m_channel)
	.arg(m_windowSize)
	.arg(m_windowHopLevel)
	.arg(m_gain)
	.arg(m_threshold);

    s += QString("minFrequency=\"%1\" "
		 "maxFrequency=\"%2\" "
		 "colourScale=\"%3\" "
		 "colourScheme=\"%4\" "
		 "colourRotation=\"%5\" "
		 "frequencyScale=\"%6\" "
		 "binDisplay=\"%7\" "
		 "normalizeColumns=\"%8\" "
                 "normalizeVisibleArea=\"%9\"")
	.arg(m_minFrequency)
	.arg(m_maxFrequency)
	.arg(m_colourScale)
	.arg(m_colourMap)
	.arg(m_colourRotation)
	.arg(m_frequencyScale)
	.arg(m_binDisplay)
	.arg(m_normalizeColumns ? "true" : "false")
        .arg(m_normalizeVisibleArea ? "true" : "false");

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

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

    int channel = attributes.value("channel").toInt(&ok);
    if (ok) setChannel(channel);

    size_t windowSize = attributes.value("windowSize").toUInt(&ok);
    if (ok) setWindowSize(windowSize);

    size_t windowHopLevel = attributes.value("windowHopLevel").toUInt(&ok);
    if (ok) setWindowHopLevel(windowHopLevel);
    else {
        size_t windowOverlap = attributes.value("windowOverlap").toUInt(&ok);
        // a percentage value
        if (ok) {
            if (windowOverlap == 0) setWindowHopLevel(0);
            else if (windowOverlap == 25) setWindowHopLevel(1);
            else if (windowOverlap == 50) setWindowHopLevel(2);
            else if (windowOverlap == 75) setWindowHopLevel(3);
            else if (windowOverlap == 90) setWindowHopLevel(4);
        }
    }

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

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

    size_t minFrequency = attributes.value("minFrequency").toUInt(&ok);
    if (ok) {
        std::cerr << "SpectrogramLayer::setProperties: setting min freq to " << minFrequency << std::endl;
        setMinFrequency(minFrequency);
    }

    size_t maxFrequency = attributes.value("maxFrequency").toUInt(&ok);
    if (ok) {
        std::cerr << "SpectrogramLayer::setProperties: setting max freq to " << maxFrequency << std::endl;
        setMaxFrequency(maxFrequency);
    }

    ColourScale colourScale = (ColourScale)
	attributes.value("colourScale").toInt(&ok);
    if (ok) setColourScale(colourScale);

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

    int colourRotation = attributes.value("colourRotation").toInt(&ok);
    if (ok) setColourRotation(colourRotation);

    FrequencyScale frequencyScale = (FrequencyScale)
	attributes.value("frequencyScale").toInt(&ok);
    if (ok) setFrequencyScale(frequencyScale);

    BinDisplay binDisplay = (BinDisplay)
	attributes.value("binDisplay").toInt(&ok);
    if (ok) setBinDisplay(binDisplay);

    bool normalizeColumns =
	(attributes.value("normalizeColumns").trimmed() == "true");
    setNormalizeColumns(normalizeColumns);

    bool normalizeVisibleArea =
	(attributes.value("normalizeVisibleArea").trimmed() == "true");
    setNormalizeVisibleArea(normalizeVisibleArea);
}