annotate base/ColourDatabase.cpp @ 335:02d2ad95ea52 spectrogram-cache-rejig

* Get storage advice for each cache in an FFT data server.  Allows us to be
  more confident about the actual memory situation and cut over from memory
  to disc part way through an FFT calculation if necessary.  StorageAdviser
  is now a bit too optimistic though (it's too keen to allocate large numbers
  of small blocks in memory).

/* -*- 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 2007 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 "ColourDatabase.h"
#include "XmlExportable.h"

#include <QPainter>

ColourDatabase
ColourDatabase::m_instance;

ColourDatabase *
ColourDatabase::getInstance()
{
    return &m_instance;
}

ColourDatabase::ColourDatabase()
{
}

int
ColourDatabase::getColourCount() const
{
    return m_colours.size();
}

QString
ColourDatabase::getColourName(int c) const
{
    if (c < 0 || size_t(c) >= m_colours.size()) return "";
    return m_colours[c].name;
}

QColor
ColourDatabase::getColour(int c) const
{
    if (c < 0 || size_t(c) >= m_colours.size()) return Qt::black;
    return m_colours[c].colour;
}

QColor
ColourDatabase::getColour(QString name) const
{
    for (ColourList::const_iterator i = m_colours.begin();
         i != m_colours.end(); ++i) {
        if (i->name == name) return i->colour;
    }

    return Qt::black;
}

int
ColourDatabase::getColourIndex(QString name) const
{
    int index = 0;
    for (ColourList::const_iterator i = m_colours.begin();
         i != m_colours.end(); ++i) {
        if (i->name == name) return index;
        ++index;
    }

    return -1;
}

int
ColourDatabase::getColourIndex(QColor c) const
{
    int index = 0;
    for (ColourList::const_iterator i = m_colours.begin();
         i != m_colours.end(); ++i) {
        if (i->colour == c) return index;
        ++index;
    }

    return -1;
}

bool
ColourDatabase::useDarkBackground(int c) const
{
    if (c < 0 || size_t(c) >= m_colours.size()) return false;
    return m_colours[c].darkbg;
}

void
ColourDatabase::setUseDarkBackground(int c, bool dark)
{
    if (c < 0 || size_t(c) >= m_colours.size()) return;
    if (m_colours[c].darkbg != dark) {
        m_colours[c].darkbg = dark;
        emit colourDatabaseChanged();
    }
}

int
ColourDatabase::addColour(QColor c, QString name)
{
    int index = 0;
    for (ColourList::iterator i = m_colours.begin();
         i != m_colours.end(); ++i) {
        if (i->name == name) {
            i->colour = c;
            return index;
        }
        ++index;
    }

    ColourRec rec;
    rec.colour = c;
    rec.name = name;
    rec.darkbg = false;
    m_colours.push_back(rec);
    emit colourDatabaseChanged();
    return index;
}

void
ColourDatabase::removeColour(QString name)
{
    for (ColourList::iterator i = m_colours.begin();
         i != m_colours.end(); ++i) {
        if (i->name == name) {
            m_colours.erase(i);
            return;
        }
    }
}

void
ColourDatabase::getStringValues(int index,
                                QString &colourName,
                                QString &colourSpec,
                                QString &darkbg) const
{
    colourName = "";
    colourSpec = "";
    if (index < 0 || size_t(index) >= m_colours.size()) return;

    colourName = getColourName(index);
    colourSpec = XmlExportable::encodeColour(getColour(index));
    darkbg = useDarkBackground(index) ? "true" : "false";
}

int
ColourDatabase::putStringValues(QString colourName,
                                QString colourSpec,
                                QString darkbg)
{
    int index = -1;
    if (colourSpec != "") {
	QColor colour(colourSpec);
        index = getColourIndex(colour);
        if (index < 0) {
            index = addColour(colour,
                              colourName == "" ? colourSpec : colourName);
        }
    } else if (colourName != "") {
        index = getColourIndex(colourName);
    }
    if (index >= 0) {
        setUseDarkBackground(index, darkbg == "true");
    }
    return index;
}

void
ColourDatabase::getColourPropertyRange(int *min, int *max) const
{
    ColourDatabase *db = getInstance();
    if (min) *min = 0;
    if (max) {
        *max = 0;
        if (db->getColourCount() > 0) *max = db->getColourCount()-1;
    }
}

QPixmap
ColourDatabase::getExamplePixmap(int index, QSize size) const
{
    QPixmap pmap(size);
    pmap.fill(useDarkBackground(index) ? Qt::black : Qt::white);
    QPainter paint(&pmap);
    QColor colour(getColour(index));
    paint.setPen(colour);
    paint.setBrush(colour);
    int margin = 2;
    if (size.width() < 4 || size.height() < 4) margin = 0;
    else if (size.width() < 8 || size.height() < 8) margin = 1;
    paint.drawRect(margin, margin,
                   size.width() - margin*2 - 1, size.height() - margin*2 - 1);
    return pmap;
}