view layer/TimeRulerLayer.cpp @ 1127:9fb8dfd7ce4c spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam.
   
    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 "TimeRulerLayer.h"

#include "LayerFactory.h"

#include "data/model/Model.h"
#include "base/RealTime.h"
#include "view/View.h"

#include "ColourDatabase.h"
#include "PaintAssistant.h"

#include <QPainter>

#include <iostream>
#include <cmath>
#include <stdexcept>

//#define DEBUG_TIME_RULER_LAYER 1


TimeRulerLayer::TimeRulerLayer() :
    SingleColourLayer(),
    m_model(0),
    m_labelHeight(LabelTop)
{
    
}

void
TimeRulerLayer::setModel(Model *model)
{
    if (m_model == model) return;
    m_model = model;
    emit modelReplaced();
}

bool
TimeRulerLayer::snapToFeatureFrame(LayerGeometryProvider *v, sv_frame_t &frame,
                                   int &resolution, SnapType snap) const
{
    if (!m_model) {
        resolution = 1;
        return false;
    }

    bool q;
    int tick = getMajorTickSpacing(v, q);
    RealTime rtick = RealTime::fromMilliseconds(tick);
    sv_samplerate_t rate = m_model->getSampleRate();
    
    RealTime rt = RealTime::frame2RealTime(frame, rate);
    double ratio = rt / rtick;

    int rounded = int(ratio);
    RealTime rdrt = rtick * rounded;

    sv_frame_t left = RealTime::realTime2Frame(rdrt, rate);
    resolution = int(RealTime::realTime2Frame(rtick, rate));
    sv_frame_t right = left + resolution;

//    SVDEBUG << "TimeRulerLayer::snapToFeatureFrame: type "
//              << int(snap) << ", frame " << frame << " (time "
//              << rt << ", tick " << rtick << ", rounded " << rdrt << ") ";

    switch (snap) {

    case SnapLeft:
        frame = left;
        break;

    case SnapRight:
        frame = right;
        break;
        
    case SnapNearest:
    {
        if (llabs(frame - left) > llabs(right - frame)) {
            frame = right;
        } else {
            frame = left;
        }
        break;
    }

    case SnapNeighbouring:
    {
        int dl = -1, dr = -1;
        int x = v->getXForFrame(frame);

        if (left > v->getStartFrame() &&
            left < v->getEndFrame()) {
            dl = abs(v->getXForFrame(left) - x);
        }

        if (right > v->getStartFrame() &&
            right < v->getEndFrame()) {
            dr = abs(v->getXForFrame(right) - x);
        }

        int fuzz = 2;

        if (dl >= 0 && dr >= 0) {
            if (dl < dr) {
                if (dl <= fuzz) {
                    frame = left;
                }
            } else {
                if (dr < fuzz) {
                    frame = right;
                }
            }
        } else if (dl >= 0) {
            if (dl <= fuzz) {
                frame = left;
            }
        } else if (dr >= 0) {
            if (dr <= fuzz) {
                frame = right;
            }
        }
    }
    }

//    SVDEBUG << " -> " << frame << " (resolution = " << resolution << ")" << endl;

    return true;
}

int
TimeRulerLayer::getMajorTickSpacing(LayerGeometryProvider *v, bool &quarterTicks) const
{
    // return value is in milliseconds

    if (!m_model || !v) return 1000;

    sv_samplerate_t sampleRate = m_model->getSampleRate();
    if (!sampleRate) return 1000;

    sv_frame_t startFrame = v->getStartFrame();
    sv_frame_t endFrame = v->getEndFrame();

    int minPixelSpacing = 50;

    RealTime rtStart = RealTime::frame2RealTime(startFrame, sampleRate);
    RealTime rtEnd = RealTime::frame2RealTime(endFrame, sampleRate);

    int count = v->getPaintWidth() / minPixelSpacing;
    if (count < 1) count = 1;
    RealTime rtGap = (rtEnd - rtStart) / count;

    int incms;
    quarterTicks = false;

    if (rtGap.sec > 0) {
	incms = 1000;
	int s = rtGap.sec;
	if (s > 0) { incms *= 5; s /= 5; }
	if (s > 0) { incms *= 2; s /= 2; }
	if (s > 0) { incms *= 6; s /= 6; quarterTicks = true; }
	if (s > 0) { incms *= 5; s /= 5; quarterTicks = false; }
	if (s > 0) { incms *= 2; s /= 2; }
	if (s > 0) { incms *= 6; s /= 6; quarterTicks = true; }
	while (s > 0) {
	    incms *= 10;
	    s /= 10;
	    quarterTicks = false;
	}
    } else {
	incms = 1;
	int ms = rtGap.msec();
//        cerr << "rtGap.msec = " << ms << ", rtGap = " << rtGap << ", count = " << count << endl;
//        cerr << "startFrame = " << startFrame << ", endFrame = " << endFrame << " rtStart = " << rtStart << ", rtEnd = " << rtEnd << endl;
	if (ms > 0) { incms *= 10; ms /= 10; }
	if (ms > 0) { incms *= 10; ms /= 10; }
	if (ms > 0) { incms *= 5; ms /= 5; }
	if (ms > 0) { incms *= 2; ms /= 2; }
    }

    return incms;
}

void
TimeRulerLayer::paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const
{
#ifdef DEBUG_TIME_RULER_LAYER
    SVDEBUG << "TimeRulerLayer::paint (" << rect.x() << "," << rect.y()
	      << ") [" << rect.width() << "x" << rect.height() << "]" << endl;
#endif
    
    if (!m_model || !m_model->isOK()) return;

    sv_samplerate_t sampleRate = m_model->getSampleRate();
    if (!sampleRate) return;

    sv_frame_t startFrame = v->getFrameForX(rect.x() - 50);

#ifdef DEBUG_TIME_RULER_LAYER
    cerr << "start frame = " << startFrame << endl;
#endif

    bool quarter = false;
    int incms = getMajorTickSpacing(v, quarter);

    int ms = int(lrint(1000.0 * (double(startFrame) / double(sampleRate))));
    ms = (ms / incms) * incms - incms;

#ifdef DEBUG_TIME_RULER_LAYER
    cerr << "start ms = " << ms << " at step " << incms << endl;
#endif

    // Calculate the number of ticks per increment -- approximate
    // values for x and frame counts here will do, no rounding issue.
    // We always use the exact incms in our calculations for where to
    // draw the actual ticks or lines.

    int minPixelSpacing = 50;
    sv_frame_t incFrame = lrint((incms * sampleRate) / 1000);
    int incX = int(incFrame / v->getZoomLevel());
    int ticks = 10;
    if (incX < minPixelSpacing * 2) {
	ticks = quarter ? 4 : 5;
    }

    QColor greyColour = getPartialShades(v)[1];

    paint.save();

    // Do not label time zero - we now overlay an opaque area over
    // time < 0 which would cut it in half
    int minlabel = 1; // ms

    // used for a sanity check
    sv_frame_t prevframe = 0;
    
    while (1) {

        // frame is used to determine where to draw the lines, so it
        // needs to correspond to an exact pixel (so that we don't get
        // a different pixel when scrolling a small amount and
        // re-drawing with a different start frame).

        double dms = ms;
        sv_frame_t frame = lrint((dms * sampleRate) / 1000.0);
        frame /= v->getZoomLevel();
        frame *= v->getZoomLevel(); // so frame corresponds to an exact pixel

        if (frame == prevframe && prevframe != 0) {
            cerr << "ERROR: frame == prevframe (== " << frame
                 << ") in TimeRulerLayer::paint" << endl;
            throw std::logic_error("frame == prevframe in TimeRulerLayer::paint");
        }
        prevframe = frame;
        
        int x = v->getXForFrame(frame);

#ifdef DEBUG_TIME_RULER_LAYER
        cerr << "Considering frame = " << frame << ", x = " << x << endl;
#endif

        if (x >= rect.x() + rect.width() + 50) {
#ifdef DEBUG_TIME_RULER_LAYER
            cerr << "X well out of range, ending here" << endl;
#endif
            break;
        }

	if (x >= rect.x() - 50 && ms >= minlabel) {

            RealTime rt = RealTime::fromMilliseconds(ms);

#ifdef DEBUG_TIME_RULER_LAYER
            cerr << "X in range, drawing line here for time " << rt.toText() << endl;
#endif

            QString text(QString::fromStdString(rt.toText()));
            QFontMetrics metrics = paint.fontMetrics();
            int tw = metrics.width(text);

            if (tw < 50 &&
                (x < rect.x() - tw/2 ||
                 x >= rect.x() + rect.width() + tw/2)) {
#ifdef DEBUG_TIME_RULER_LAYER
                cerr << "hm, maybe X isn't in range after all (x = " << x << ", tw = " << tw << ", rect.x() = " << rect.x() << ", rect.width() = " << rect.width() << ")" << endl;
#endif
            }

            paint.setPen(greyColour);
            paint.drawLine(x, 0, x, v->getPaintHeight());

            paint.setPen(getBaseQColor());
            paint.drawLine(x, 0, x, 5);
            paint.drawLine(x, v->getPaintHeight() - 6, x, v->getPaintHeight() - 1);

            int y;
            switch (m_labelHeight) {
            default:
            case LabelTop:
                y = 6 + metrics.ascent();
                break;
            case LabelMiddle:
                y = v->getPaintHeight() / 2 - metrics.height() / 2 + metrics.ascent();
                break;
            case LabelBottom:
                y = v->getPaintHeight() - metrics.height() + metrics.ascent() - 6;
            }

            if (v->getViewManager() && v->getViewManager()->getOverlayMode() !=
                ViewManager::NoOverlays) {

                if (v->getView()->getLayer(0) == this) {
                    // backmost layer, don't worry about outlining the text
                    paint.drawText(x+2 - tw/2, y, text);
                } else {
                    PaintAssistant::drawVisibleText(v, paint, x+2 - tw/2, y, text, PaintAssistant::OutlinedText);
                }
            }
        }

	paint.setPen(greyColour);

	for (int i = 1; i < ticks; ++i) {

            dms = ms + (i * double(incms)) / ticks;
            frame = lrint((dms * sampleRate) / 1000.0);
            frame /= v->getZoomLevel();
            frame *= v->getZoomLevel(); // exact pixel as above

            x = v->getXForFrame(frame);

            if (x < rect.x() || x >= rect.x() + rect.width()) {
#ifdef DEBUG_TIME_RULER_LAYER
//                cerr << "tick " << i << ": X out of range, going on to next tick" << endl;
#endif
                continue;
            }

#ifdef DEBUG_TIME_RULER_LAYER
            cerr << "tick " << i << " in range, drawing at " << x << endl;
#endif

	    int sz = 5;
	    if (ticks == 10) {
		if ((i % 2) == 1) {
		    if (i == 5) {
			paint.drawLine(x, 0, x, v->getPaintHeight());
		    } else sz = 3;
		} else {
		    sz = 7;
		}
	    }
	    paint.drawLine(x, 0, x, sz);
	    paint.drawLine(x, v->getPaintHeight() - sz - 1, x, v->getPaintHeight() - 1);
	}

	ms += incms;
    }

    paint.restore();
}

int
TimeRulerLayer::getDefaultColourHint(bool darkbg, bool &impose)
{
    impose = true;
    return ColourDatabase::getInstance()->getColourIndex
        (QString(darkbg ? "White" : "Black"));
}

QString TimeRulerLayer::getLayerPresentationName() const
{
    LayerFactory *factory = LayerFactory::getInstance();
    QString layerName = factory->getLayerPresentationName
        (factory->getLayerType(this));
    return layerName;
}

void
TimeRulerLayer::toXml(QTextStream &stream,
                      QString indent, QString extraAttributes) const
{
    SingleColourLayer::toXml(stream, indent, extraAttributes);
}

void
TimeRulerLayer::setProperties(const QXmlAttributes &attributes)
{
    SingleColourLayer::setProperties(attributes);
}