annotate data/model/Dense3DModelPeakCache.cpp @ 1455:ec9e65fcf749

The use of the begin/end pairs here just seems to cause too many rows to be deleted (from the visual representation, not the underlying model). Things apparently work better if we just modify the underlying model and let the change signals percolate back up again. To that end, update the change handlers so as to cover their proper ranges with dataChanged signals.

/* -*- 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 2009 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 "Dense3DModelPeakCache.h"

#include "base/Profiler.h"

#include "base/HitCount.h"

Dense3DModelPeakCache::Dense3DModelPeakCache(const DenseThreeDimensionalModel *source,
                                             int columnsPerPeak) :
    m_source(source),
    m_columnsPerPeak(columnsPerPeak)
{
    m_cache = new EditableDenseThreeDimensionalModel
        (source->getSampleRate(),
         getResolution(),
         source->getHeight(),
         EditableDenseThreeDimensionalModel::NoCompression,
         false);

    connect(source, SIGNAL(modelChanged()),
            this, SLOT(sourceModelChanged()));
    connect(source, SIGNAL(aboutToBeDeleted()),
            this, SLOT(sourceModelAboutToBeDeleted()));
}

Dense3DModelPeakCache::~Dense3DModelPeakCache()
{
    if (m_cache) m_cache->aboutToDelete();
    delete m_cache;
}

Dense3DModelPeakCache::Column
Dense3DModelPeakCache::getColumn(int column) const
{
    if (!m_source) return Column();
    if (!haveColumn(column)) fillColumn(column);
    return m_cache->getColumn(column);
}

float
Dense3DModelPeakCache::getValueAt(int column, int n) const
{
    if (!m_source) return 0.f;
    if (!haveColumn(column)) fillColumn(column);
    return m_cache->getValueAt(column, n);
}

void
Dense3DModelPeakCache::sourceModelChanged()
{
    if (!m_source) return;
    if (m_coverage.size() > 0) {
        // The last peak may have come from an incomplete read, which
        // may since have been filled, so reset it
        m_coverage[m_coverage.size()-1] = false;
    }
    m_coverage.resize(getWidth(), false); // retaining data
}

void
Dense3DModelPeakCache::sourceModelAboutToBeDeleted()
{
    m_source = 0;
}

bool
Dense3DModelPeakCache::haveColumn(int column) const
{
    static HitCount count("Dense3DModelPeakCache");
    if (in_range_for(m_coverage, column) && m_coverage[column]) {
        count.hit();
        return true;
    } else {
        count.miss();
        return false;
    }
}

void
Dense3DModelPeakCache::fillColumn(int column) const
{
    Profiler profiler("Dense3DModelPeakCache::fillColumn");

    if (!in_range_for(m_coverage, column)) {
        if (m_coverage.size() > 0) {
            // The last peak may have come from an incomplete read, which
            // may since have been filled, so reset it
            m_coverage[m_coverage.size()-1] = false;
        }
        m_coverage.resize(column + 1, false);
    }

    int sourceWidth = m_source->getWidth();
    
    Column peak;
    int n = 0;
    for (int i = 0; i < m_columnsPerPeak; ++i) {

        int sourceColumn = column * m_columnsPerPeak + i;
        if (sourceColumn >= sourceWidth) break;
        
        Column here = m_source->getColumn(sourceColumn);

//        cerr << "Dense3DModelPeakCache::fillColumn(" << column << "): source col "
//             << sourceColumn << " of " << sourceWidth
//             << " returned " << here.size() << " elts" << endl;
        
        if (i == 0) {
            peak = here;
            n = int(peak.size());
        } else {
            int m = std::min(n, int(here.size()));
            for (int j = 0; j < m; ++j) {
                peak[j] = std::max(here[j], peak[j]);
            }
        }
    }

    m_cache->setColumn(column, peak);
    m_coverage[column] = true;
}