view widgets/IconLoader.cpp @ 473:4f4f943bfdfc

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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 "IconLoader.h"

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

static const char *autoInvertExceptions[] = {
    // These are the icons that look OK in their default colours, even
    // in a colour scheme with a black background.  (They may also be
    // icons that would look worse if we tried to auto-invert them.)
    // If we have icons that look bad when auto-inverted but that are
    // not suitable for use without being inverted, we'll need to
    // supply inverted versions -- the loader will load xx_inverse.png
    // in preference to xx.png if a dark background is found.)
    "fileclose",
    "filenew-22",
    "filenew",
    "fileopen-22",
    "fileopen",
    "fileopenaudio",
    "fileopensession",
    "filesave-22",
    "filesave",
    "filesaveas-22",
    "filesaveas",
    "help",
    "editcut",
    "editcopy",
    "editpaste",
    "editdelete",
    "exit",
    "zoom-fit",
    "zoom-in",
    "zoom-out",
    "zoom"
};

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

QPixmap
IconLoader::loadPixmap(QString name)
{
    QColor bg = QApplication::palette().window().color();
    if (bg.red() + bg.green() + bg.blue() > 384) { // light background
        QPixmap pmap(QString(":icons/%1").arg(name));
        if (pmap.isNull()) {
            pmap = QPixmap(QString(":icons/%1.png").arg(name));
        }
        return pmap;
    }

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

    for (int i = 0; i < sizeof(autoInvertExceptions)/
                        sizeof(autoInvertExceptions[0]); ++i) {
        if (autoInvertExceptions[i] == name) {
            return pmap;
        }
    }

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

    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;
}