view layer/ColourMapper.cpp @ 1534:bfd8b22fd67c

Fix #1904 Scrolling colour 3d plot does not always work when in View normalisation mode. We shouldn't imagine we've just invalidated the cache if the truth is that we've only just created the renderer

/* -*- 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 2006-2016 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 "ColourMapper.h"

#include <iostream>

#include <cmath>

#include "base/Debug.h"

#include <vector>

#include <QPainter>

using namespace std;

static vector<QColor> convertStrings(const vector<QString> &strs,
                                     bool reversed)
{
    vector<QColor> converted;
    for (const auto &s: strs) converted.push_back(QColor(s));
    if (reversed) {
        reverse(converted.begin(), converted.end());
    }
    return converted;
}

static vector<QColor> ice = convertStrings({
        // Based on ColorBrewer ylGnBu
        "#ffffff", "#ffff00", "#f7fcf0", "#e0f3db", "#ccebc5", "#a8ddb5",
        "#7bccc4", "#4eb3d3", "#2b8cbe", "#0868ac", "#084081", "#042040"
    },
    true);

static vector<QColor> cherry = convertStrings({
        "#f7f7f7", "#fddbc7", "#f4a582", "#d6604d", "#b2182b", "#dd3497",
        "#ae017e", "#7a0177", "#49006a"
    },
    true);

static vector<QColor> magma = convertStrings({
        "#FCFFB2", "#FCDF96", "#FBC17D", "#FBA368", "#FA8657", "#F66B4D",
        "#ED504A", "#E03B50", "#C92D59", "#B02363", "#981D69", "#81176D",
        "#6B116F", "#57096E", "#43006A", "#300060", "#1E0848", "#110B2D",
        "#080616", "#000005"
    },
    true);

static vector<QColor> cividis = convertStrings({
        "#00204c", "#00204e", "#002150", "#002251", "#002353", "#002355",
        "#002456", "#002558", "#00265a", "#00265b", "#00275d", "#00285f",
        "#002861", "#002963", "#002a64", "#002a66", "#002b68", "#002c6a",
        "#002d6c", "#002d6d", "#002e6e", "#002e6f", "#002f6f", "#002f6f",
        "#00306f", "#00316f", "#00316f", "#00326e", "#00336e", "#00346e",
        "#00346e", "#01356e", "#06366e", "#0a376d", "#0e376d", "#12386d",
        "#15396d", "#17396d", "#1a3a6c", "#1c3b6c", "#1e3c6c", "#203c6c",
        "#223d6c", "#243e6c", "#263e6c", "#273f6c", "#29406b", "#2b416b",
        "#2c416b", "#2e426b", "#2f436b", "#31446b", "#32446b", "#33456b",
        "#35466b", "#36466b", "#37476b", "#38486b", "#3a496b", "#3b496b",
        "#3c4a6b", "#3d4b6b", "#3e4b6b", "#404c6b", "#414d6b", "#424e6b",
        "#434e6b", "#444f6b", "#45506b", "#46506b", "#47516b", "#48526b",
        "#49536b", "#4a536b", "#4b546b", "#4c556b", "#4d556b", "#4e566b",
        "#4f576c", "#50586c", "#51586c", "#52596c", "#535a6c", "#545a6c",
        "#555b6c", "#565c6c", "#575d6d", "#585d6d", "#595e6d", "#5a5f6d",
        "#5b5f6d", "#5c606d", "#5d616e", "#5e626e", "#5f626e", "#5f636e",
        "#60646e", "#61656f", "#62656f", "#63666f", "#64676f", "#65676f",
        "#666870", "#676970", "#686a70", "#686a70", "#696b71", "#6a6c71",
        "#6b6d71", "#6c6d72", "#6d6e72", "#6e6f72", "#6f6f72", "#6f7073",
        "#707173", "#717273", "#727274", "#737374", "#747475", "#757575",
        "#757575", "#767676", "#777776", "#787876", "#797877", "#7a7977",
        "#7b7a77", "#7b7b78", "#7c7b78", "#7d7c78", "#7e7d78", "#7f7e78",
        "#807e78", "#817f78", "#828078", "#838178", "#848178", "#858278",
        "#868378", "#878478", "#888578", "#898578", "#8a8678", "#8b8778",
        "#8c8878", "#8d8878", "#8e8978", "#8f8a78", "#908b78", "#918c78",
        "#928c78", "#938d78", "#948e78", "#958f78", "#968f77", "#979077",
        "#989177", "#999277", "#9a9377", "#9b9377", "#9c9477", "#9d9577",
        "#9e9676", "#9f9776", "#a09876", "#a19876", "#a29976", "#a39a75",
        "#a49b75", "#a59c75", "#a69c75", "#a79d75", "#a89e74", "#a99f74",
        "#aaa074", "#aba174", "#aca173", "#ada273", "#aea373", "#afa473",
        "#b0a572", "#b1a672", "#b2a672", "#b4a771", "#b5a871", "#b6a971",
        "#b7aa70", "#b8ab70", "#b9ab70", "#baac6f", "#bbad6f", "#bcae6e",
        "#bdaf6e", "#beb06e", "#bfb16d", "#c0b16d", "#c1b26c", "#c2b36c",
        "#c3b46c", "#c5b56b", "#c6b66b", "#c7b76a", "#c8b86a", "#c9b869",
        "#cab969", "#cbba68", "#ccbb68", "#cdbc67", "#cebd67", "#d0be66",
        "#d1bf66", "#d2c065", "#d3c065", "#d4c164", "#d5c263", "#d6c363",
        "#d7c462", "#d8c561", "#d9c661", "#dbc760", "#dcc860", "#ddc95f",
        "#deca5e", "#dfcb5d", "#e0cb5d", "#e1cc5c", "#e3cd5b", "#e4ce5b",
        "#e5cf5a", "#e6d059", "#e7d158", "#e8d257", "#e9d356", "#ebd456",
        "#ecd555", "#edd654", "#eed753", "#efd852", "#f0d951", "#f1da50",
        "#f3db4f", "#f4dc4e", "#f5dd4d", "#f6de4c", "#f7df4b", "#f9e049",
        "#fae048", "#fbe147", "#fce246", "#fde345", "#ffe443", "#ffe542",
        "#ffe642", "#ffe743", "#ffe844", "#ffe945"
    },
    false);

static void
mapDiscrete(double norm, vector<QColor> &colours, double &r, double &g, double &b)
{
    int n = int(colours.size());
    double m = norm * (n-1);
    if (m >= n-1) { colours[n-1].getRgbF(&r, &g, &b, nullptr); return; }
    if (m <= 0) { colours[0].getRgbF(&r, &g, &b, nullptr); return; }
    int base(int(floor(m)));
    double prop0 = (base + 1.0) - m, prop1 = m - base;
    QColor c0(colours[base]), c1(colours[base+1]);
    r = c0.redF() * prop0 + c1.redF() * prop1;
    g = c0.greenF() * prop0 + c1.greenF() * prop1;
    b = c0.blueF() * prop0 + c1.blueF() * prop1;
}

ColourMapper::ColourMapper(int map, bool inverted, double min, double max) :
    m_map(map),
    m_inverted(inverted),
    m_min(min),
    m_max(max)
{
    if (m_min == m_max) {
        SVCERR << "WARNING: ColourMapper: min == max (== " << m_min
                  << "), adjusting" << endl;
        m_max = m_min + 1;
    }
}

ColourMapper::~ColourMapper()
{
}

int
ColourMapper::getColourMapCount()
{
    return 15;
}

QString
ColourMapper::getColourMapLabel(int n)
{
    // When adding a map, be sure to also update getColourMapCount()
    
    if (n >= getColourMapCount()) return QObject::tr("<unknown>");
    ColourMap map = (ColourMap)n;

    switch (map) {
    case Green:            return QObject::tr("Green");
    case WhiteOnBlack:     return QObject::tr("White on Black");
    case BlackOnWhite:     return QObject::tr("Black on White");
    case Cherry:           return QObject::tr("Cherry");
    case Wasp:             return QObject::tr("Wasp");
    case Ice:              return QObject::tr("Ice");
    case Sunset:           return QObject::tr("Sunset");
    case FruitSalad:       return QObject::tr("Fruit Salad");
    case Banded:           return QObject::tr("Banded");
    case Highlight:        return QObject::tr("Highlight");
    case Printer:          return QObject::tr("Printer");
    case HighGain:         return QObject::tr("High Gain");
    case BlueOnBlack:      return QObject::tr("Blue on Black");
    case Cividis:          return QObject::tr("Cividis");
    case Magma:            return QObject::tr("Magma");
    }

    return QObject::tr("<unknown>");
}

QString
ColourMapper::getColourMapId(int n)
{
    if (n >= getColourMapCount()) return "<unknown>";
    ColourMap map = (ColourMap)n;

    switch (map) {
    case Green:            return "Green";
    case WhiteOnBlack:     return "White on Black";
    case BlackOnWhite:     return "Black on White";
    case Cherry:           return "Cherry";
    case Wasp:             return "Wasp";
    case Ice:              return "Ice";
    case Sunset:           return "Sunset";
    case FruitSalad:       return "Fruit Salad";
    case Banded:           return "Banded";
    case Highlight:        return "Highlight";
    case Printer:          return "Printer";
    case HighGain:         return "High Gain";
    case BlueOnBlack:      return "Blue on Black";
    case Cividis:          return "Cividis";
    case Magma:            return "Magma";
    }

    return "<unknown>";
}

int
ColourMapper::getColourMapById(QString id)
{
    ColourMap map = (ColourMap)getColourMapCount();

    if      (id == "Green")            { map = Green; }
    else if (id == "White on Black")   { map = WhiteOnBlack; }
    else if (id == "Black on White")   { map = BlackOnWhite; }
    else if (id == "Cherry")           { map = Cherry; }
    else if (id == "Wasp")             { map = Wasp; }
    else if (id == "Ice")              { map = Ice; }
    else if (id == "Sunset")           { map = Sunset; }
    else if (id == "Fruit Salad")      { map = FruitSalad; }
    else if (id == "Banded")           { map = Banded; }
    else if (id == "Highlight")        { map = Highlight; }
    else if (id == "Printer")          { map = Printer; }
    else if (id == "High Gain")        { map = HighGain; }
    else if (id == "Blue on Black")    { map = BlueOnBlack; }
    else if (id == "Cividis")          { map = Cividis; }
    else if (id == "Magma")            { map = Magma; }

    if (map == (ColourMap)getColourMapCount()) {
        return -1;
    } else {
        return int(map);
    }
}

int
ColourMapper::getBackwardCompatibilityColourMap(int n)
{
    /* Returned value should be an index into the series
     * (Default/Green, Sunset, WhiteOnBlack, BlackOnWhite, RedOnBlue,
     * YellowOnBlack, BlueOnBlack, FruitSalad, Banded, Highlight,
     * Printer, HighGain). Minimum 0, maximum 11.
     */
        
    if (n >= getColourMapCount()) return 0;
    ColourMap map = (ColourMap)n;

    switch (map) {
    case Green:            return 0;
    case WhiteOnBlack:     return 2;
    case BlackOnWhite:     return 3;
    case Cherry:           return 4;
    case Wasp:             return 5;
    case Ice:              return 6;
    case Sunset:           return 1;
    case FruitSalad:       return 7;
    case Banded:           return 8;
    case Highlight:        return 9;
    case Printer:          return 10;
    case HighGain:         return 11;
    case BlueOnBlack:      return 6;
    case Cividis:          return 6;
    case Magma:            return 1;
    }

    return 0;
}

QColor
ColourMapper::map(double value) const
{
    double norm = (value - m_min) / (m_max - m_min);
    if (norm < 0.0) norm = 0.0;
    if (norm > 1.0) norm = 1.0;

    if (m_inverted) {
        norm = 1.0 - norm;
    }
    
    double h = 0.0, s = 0.0, v = 0.0, r = 0.0, g = 0.0, b = 0.0;
    bool hsv = true;

    double blue = 0.6666, pieslice = 0.3333;

    if (m_map >= getColourMapCount()) return Qt::black;
    ColourMap map = (ColourMap)m_map;

    switch (map) {

    case Green:
        h = blue - norm * 2.0 * pieslice;
        s = 0.5f + norm/2.0;
        v = norm;
        break;

    case WhiteOnBlack:
        r = g = b = norm;
        hsv = false;
        break;

    case BlackOnWhite:
        r = g = b = 1.0 - norm;
        hsv = false;
        break;

    case Cherry:
        hsv = false;
        mapDiscrete(norm, cherry, r, g, b);
        break;

    case Wasp:
        h = 0.15;
        s = 1.0;
        v = norm;
        break;
        
    case BlueOnBlack:
        h = blue;
        s = 1.0;
        v = norm * 2.0;
        if (v > 1.0) {
            v = 1.0;
            s = 1.0 - (sqrt(norm) - 0.707) * 3.413;
            if (s < 0.0) s = 0.0;
            if (s > 1.0) s = 1.0;
        }
        break;

    case Sunset:
        r = (norm - 0.24) * 2.38;
        if (r > 1.0) r = 1.0;
        if (r < 0.0) r = 0.0;
        g = (norm - 0.64) * 2.777;
        if (g > 1.0) g = 1.0;
        if (g < 0.0) g = 0.0;
        b = (3.6f * norm);
        if (norm > 0.277) b = 2.0 - b;
        if (b > 1.0) b = 1.0;
        if (b < 0.0) b = 0.0;
        hsv = false;
        break;

    case FruitSalad:
        h = blue + (pieslice/6.0) - norm;
        if (h < 0.0) h += 1.0;
        s = 1.0;
        v = 1.0;
        break;

    case Banded:
        if      (norm < 0.125) return Qt::darkGreen;
        else if (norm < 0.25)  return Qt::green;
        else if (norm < 0.375) return Qt::darkBlue;
        else if (norm < 0.5)   return Qt::blue;
        else if (norm < 0.625) return Qt::darkYellow;
        else if (norm < 0.75)  return Qt::yellow;
        else if (norm < 0.875) return Qt::darkRed;
        else                   return Qt::red;
        break;

    case Highlight:
        if (norm > 0.99) return Qt::white;
        else return Qt::darkBlue;

    case Printer:
        if (norm > 0.8) {
            r = 1.0;
        } else if (norm > 0.7) {
            r = 0.9;
        } else if (norm > 0.6) {
            r = 0.8;
        } else if (norm > 0.5) {
            r = 0.7;
        } else if (norm > 0.4) {
            r = 0.6;
        } else if (norm > 0.3) {
            r = 0.5;
        } else if (norm > 0.2) {
            r = 0.4;
        } else {
            r = 0.0;
        }
        r = g = b = 1.0 - r;
        hsv = false;
        break;

    case HighGain:
        if (norm <= 1.0 / 256.0) {
            norm = 0.0;
        } else {
            norm = 0.1f + (pow(((norm - 0.5) * 2.0), 3.0) + 1.0) / 2.081;
        }
        // now as for Sunset
        r = (norm - 0.24) * 2.38;
        if (r > 1.0) r = 1.0;
        if (r < 0.0) r = 0.0;
        g = (norm - 0.64) * 2.777;
        if (g > 1.0) g = 1.0;
        if (g < 0.0) g = 0.0;
        b = (3.6f * norm);
        if (norm > 0.277) b = 2.0 - b;
        if (b > 1.0) b = 1.0;
        if (b < 0.0) b = 0.0;
        hsv = false;
/*
        if (r > 1.0) r = 1.0;
        r = g = b = 1.0 - r;
        hsv = false;
*/
        break;

    case Ice:
        hsv = false;
        mapDiscrete(norm, ice, r, g, b);
        break;

    case Cividis:
        hsv = false;
        mapDiscrete(norm, cividis, r, g, b);
        break;

    case Magma:
        hsv = false;
        mapDiscrete(norm, magma, r, g, b);
        break;
    }

    if (hsv) {
        return QColor::fromHsvF(h, s, v);
    } else {
        return QColor::fromRgbF(r, g, b);
    }
}

QColor
ColourMapper::getContrastingColour() const
{
    if (m_map >= getColourMapCount()) return Qt::white;
    ColourMap map = (ColourMap)m_map;

    switch (map) {

    case Green:
        return QColor(255, 150, 50);

    case WhiteOnBlack:
        return Qt::red;

    case BlackOnWhite:
        return Qt::darkGreen;

    case Cherry:
        return Qt::green;

    case Wasp:
        return QColor::fromHsv(240, 255, 255);

    case Ice:
        return Qt::red;

    case Sunset:
        return Qt::white;

    case FruitSalad:
        return Qt::white;

    case Banded:
        return Qt::cyan;

    case Highlight:
        return Qt::red;

    case Printer:
        return Qt::red;

    case HighGain:
        return Qt::red;

    case BlueOnBlack:
        return Qt::red;

    case Cividis:
        return Qt::white;

    case Magma:
        return Qt::white;
    }

    return Qt::white;
}

bool
ColourMapper::hasLightBackground() const
{
    if (m_map >= getColourMapCount()) return false;
    ColourMap map = (ColourMap)m_map;

    switch (map) {

    case BlackOnWhite:
    case Printer:
    case HighGain:
        return true;

    case Green:
    case Sunset:
    case WhiteOnBlack:
    case Cherry:
    case Wasp:
    case Ice:
    case FruitSalad:
    case Banded:
    case Highlight:
    case BlueOnBlack:
    case Cividis:
    case Magma:
        
    default:
        return false;
    }
}

QPixmap
ColourMapper::getExamplePixmap(QSize size) const
{
    QPixmap pmap(size);
    pmap.fill(Qt::white);
    QPainter paint(&pmap);

    int w = size.width(), h = size.height();
    
    int margin = 2;
    if (w < 4 || h < 4) margin = 0;
    else if (w < 8 || h < 8) margin = 1;

    int n = w - margin*2;
    
    for (int x = 0; x < n; ++x) {
        double value = m_min + ((m_max - m_min) * x) / (n-1);
        QColor colour(map(value));
        paint.setPen(colour);
        paint.drawLine(x + margin, margin, x + margin, h - margin);
    }
    
    return pmap;
}