view data/model/Dense3DModelPeakCache.cpp @ 545:c603d9439b37

* Add peak cache type for 3d models

/* -*- 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"

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

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

}

Dense3DModelPeakCache::~Dense3DModelPeakCache()
{
    delete m_cache;
}

bool
Dense3DModelPeakCache::isColumnAvailable(size_t column) const
{
    if (!m_source) return false;
    if (haveColumn(column)) return true;
    for (int i = 0; i < m_resolution; ++i) {
        if (!m_source->isColumnAvailable(column * m_resolution + i)) {
            return false;
        }
    }
    return true;
}

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

float
Dense3DModelPeakCache::getValueAt(size_t column, size_t 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;
    m_coverage.resize(getWidth());
}

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

bool
Dense3DModelPeakCache::haveColumn(size_t column) const
{
    return m_coverage.get(column);
}

void
Dense3DModelPeakCache::fillColumn(size_t column) const
{
    Column peak;
    for (int i = 0; i < m_resolution; ++i) {
        Column here = m_source->getColumn(column * m_resolution + i);
        if (i == 0) {
            peak = here;
        } else {
            for (int j = 0; j < peak.size() && j < here.size(); ++j) {
                if (here[j] > peak[j]) peak[j] = here[j];
            }
        }
    }
    m_cache->setColumn(column, peak);
    m_coverage.set(column);
}