dbusconverters.h

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#ifndef DBUSCONVERTERS_H
#define DBUSCONVERTERS_H
 
#include <QDBusArgument>
#include <QImage>
 
QDBusArgument& operator <<(QDBusArgument& argument, const QImage& image)
{
    if (image.isNull())
    {
        argument.beginStructure();
        argument << 0 << 0 << 0 << false << 0 << 0 << QByteArray();
        argument.endStructure();
        return argument;
    }
 
    QImage scaled = image.scaledToHeight(100, Qt::SmoothTransformation);
    scaled = scaled.convertToFormat(QImage::Format_ARGB32);
 
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
    // ABGR -> ARGB
    QImage i = scaled.rgbSwapped();
#else
    // ABGR -> GBAR
    QImage i(scaled.size(), scaled.format());
    for (int y = 0; y < i.height(); ++y)
    {
        QRgb* p = (QRgb*)scaled.scanLine(y);
        QRgb* q = (QRgb*)i.scanLine(y);
        QRgb* end = p + scaled.width();
        while (p < end)
        {
            *q = qRgba(qGreen(*p), qBlue(*p), qAlpha(*p), qRed(*p));
            p++;
            q++;
        }
    }
#endif
 
    argument.beginStructure();
    argument << i.width();
    argument << i.height();
    argument << static_cast<int>(i.bytesPerLine());
    argument << i.hasAlphaChannel();
    int channels = i.isGrayscale() ? 1 : (i.hasAlphaChannel() ? 4 : 3);
    argument << i.depth() / channels;
    argument << channels;
    argument << QByteArray(reinterpret_cast<const char*>(i.bits()), i.sizeInBytes());
    argument.endStructure();
    return argument;
}
 
const QDBusArgument& operator >>(const QDBusArgument& argument, QImage&)
{
    Q_ASSERT(0);
    return argument;
}
 
#endif // DBUSCONVERTERS_H