view layer/ScrollableMagRangeCache.cpp @ 1212:a1ee3108d1d3 3.0-integration

Make the colour 3d plot renderer able to support more than one level of peak cache; introduce a second "peak" cache for the spectrogram layer that actually has a 1-1 column relationship with the underlying FFT model, and use it in addition to the existing peak cache if memory is plentiful. Makes spectrograms appear much faster in many common situations.
author Chris Cannam
date Thu, 05 Jan 2017 14:02:54 +0000
parents f2f43802718b
children a34a2a25907c
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/* -*- 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 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 "ScrollableMagRangeCache.h"

#include "base/HitCount.h"

#include <iostream>
using namespace std;

//#define DEBUG_SCROLLABLE_MAG_RANGE_CACHE 1

void
ScrollableMagRangeCache::scrollTo(const LayerGeometryProvider *v,
				  sv_frame_t newStartFrame)
{	
    static HitCount count("ScrollableMagRangeCache: scrolling");
    
    int dx = (v->getXForFrame(m_startFrame) -
	      v->getXForFrame(newStartFrame));

#ifdef DEBUG_SCROLLABLE_MAG_RANGE_CACHE
    cerr << "ScrollableMagRangeCache::scrollTo: start frame " << m_startFrame
	 << " -> " << newStartFrame << ", dx = " << dx << endl;
#endif

    if (m_startFrame == newStartFrame) {
	// haven't moved
        count.hit();
        return;
    }
    
    m_startFrame = newStartFrame;

    if (dx == 0) {
	// haven't moved visibly (even though start frame may have changed)
        count.hit();
	return;
    }
	
    int w = int(m_ranges.size());

    if (dx <= -w || dx >= w) {
	// scrolled entirely off
	invalidate();
        count.miss();
	return;
    }

    count.partial();
	
    // dx is in range, cache is scrollable

    if (dx < 0) {
	// The new start frame is to the left of the old start
	// frame. We need to add some empty ranges at the left (start)
	// end and clip the right end. Assemble -dx new values, then
	// w+dx old values starting at index 0.

	auto newRanges = vector<MagnitudeRange>(-dx);
	newRanges.insert(newRanges.end(),
			 m_ranges.begin(), m_ranges.begin() + (w + dx));
	m_ranges = newRanges;
	
    } else {
	// The new start frame is to the right of the old start
	// frame. We want to clip the left (start) end and add some
	// empty ranges at the right end. Assemble w-dx old values
	// starting at index dx, then dx new values.

	auto newRanges = vector<MagnitudeRange>(dx);
	newRanges.insert(newRanges.begin(),
			 m_ranges.begin() + dx, m_ranges.end());
	m_ranges = newRanges;
    }

#ifdef DEBUG_SCROLLABLE_MAG_RANGE_CACHE
    cerr << "maxes (" << m_ranges.size() << ") now: ";
    for (int i = 0; in_range_for(m_ranges, i); ++i) {
	cerr << m_ranges[i].getMax() << " ";
    }
    cerr << endl;
#endif
}

MagnitudeRange
ScrollableMagRangeCache::getRange(int x, int count) const
{
    MagnitudeRange r;
#ifdef DEBUG_SCROLLABLE_MAG_RANGE_CACHE
    cerr << "ScrollableMagRangeCache::getRange(" << x << ", " << count << ")" << endl;
#endif
    for (int i = 0; i < count; ++i) {
	r.sample(m_ranges.at(x + i));
    }
    return r;
}

void
ScrollableMagRangeCache::sampleColumn(int column, const MagnitudeRange &r)
{
    if (!in_range_for(m_ranges, column)) {
	cerr << "ERROR: ScrollableMagRangeCache::sampleColumn: column " << column
	     << " is out of range for cache of width " << m_ranges.size()
	     << " (with start frame " << m_startFrame << ")" << endl;
	throw logic_error("column out of range");
    } else {
	m_ranges[column].sample(r);
    }
}