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

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
    Copyright 2000-2011 the Rosegarden development team.

    This file originally from Sonic Visualiser, copyright 2007 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 "IconLoader.h"

#include <QPixmap>
#include <QApplication>
#include <QPainter>
#include <QPalette>

namespace Rosegarden
{

QIcon
IconLoader::load(QString name)
{
    QPixmap pmap(loadPixmap(name));
    if (pmap.isNull()) return QIcon();
    else return QIcon(pmap);
}

QPixmap
IconLoader::loadPixmap(QString name)
{
    if (m_cache.find(name) != m_cache.end()) return m_cache[name];
    QPixmap pixmap = loadPixmap(":pixmaps/toolbar", name);
    if (pixmap.isNull()) pixmap = loadPixmap(":pixmaps/transport", name);
    if (pixmap.isNull()) pixmap = loadPixmap(":pixmaps/misc", name);
    if (pixmap.isNull()) pixmap = loadPixmap(":pixmaps/stock", name);
    if (pixmap.isNull()) pixmap = loadPixmap(":pixmaps/icons", name);
    if (pixmap.isNull()) pixmap = loadPixmap(":pixmaps/style", name);
    if (pixmap.isNull()) pixmap = loadPixmap(":pixmaps", name);
    m_cache[name] = pixmap;
    return pixmap;
}

QPixmap
IconLoader::loadPixmap(QString dir, QString name)
{
/*
    bool light = false;
    QColor bg = QApplication::palette().window().color();
    if (bg.red() + bg.green() + bg.blue() > 384) light = true;
*/    
    bool light = true; // do not invert any icons

    if (light) {
        QPixmap pmap(QString("%1/%2").arg(dir).arg(name));
        if (pmap.isNull()) {
            pmap = QPixmap(QString("%1/%2.png").arg(dir).arg(name));
        }
        if (pmap.isNull()) {
            pmap = QPixmap(QString("%1/%2.xpm").arg(dir).arg(name));
        }
        return pmap;
    }

    QPixmap pmap(QString("%1/%2").arg(dir).arg(name));
    if (pmap.isNull()) {
        pmap = QPixmap(QString("%1/%2_inverse.png").arg(dir).arg(name));
        if (pmap.isNull()) {
            pmap = QPixmap(QString("%1/%2.png").arg(dir).arg(name));
        }
        if (pmap.isNull()) {
            pmap = QPixmap(QString("%1/%2.xpm").arg(dir).arg(name));
        }
    }
    if (pmap.isNull()) return pmap;

    // No suitable inverted icon found for black background; try to
    // auto-invert the default one

    return invert(pmap);
}

QPixmap
IconLoader::invert(QPixmap pmap)
{
    QImage img = pmap.toImage().convertToFormat(QImage::Format_ARGB32);

    for (int y = 0; y < img.height(); ++y) {
        for (int x = 0; x < img.width(); ++x) {

            QRgb rgba = img.pixel(x, y);
            QColor colour = QColor
                (qRed(rgba), qGreen(rgba), qBlue(rgba), qAlpha(rgba));

            int alpha = colour.alpha();
            if (colour.saturation() < 5 && colour.alpha() > 10) {
                colour.setHsv(colour.hue(),
                              colour.saturation(),
                              255 - colour.value());
                colour.setAlpha(alpha);
                img.setPixel(x, y, colour.rgba());
            }
        }
    }

    pmap = QPixmap::fromImage(img);
    return pmap;
}


}// end namespace Rosegarden