QQuickImageProvider reauested size always invalid.

[manuelschneid3r]

I requested my personal imageprovider, but when I debug this few lines requestedSize is always {-1,-1}

class XdgIconThemeImageProvider : public QQuickImageProvider
{
public:
    XdgIconThemeImageProvider() : QQuickImageProvider(QQuickImageProvider::Pixmap){}
    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
    {
        QIcon ico = QIcon::fromTheme(id);
        QPixmap pm =  ico.isNull() ? QPixmap() : ico.pixmap(100,100);
        *size = pm.size();
        return pm;
    }
};

class XdgIconThemeImageProvider : public QQuickImageProvider
{
public:
    XdgIconThemeImageProvider() : QQuickImageProvider(QQuickImageProvider::Pixmap){}
    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
    {
        QIcon ico = QIcon::fromTheme(id);
        QPixmap pm =  ico.isNull() ? QPixmap() : ico.pixmap(100,100);
        *size = pm.size();
        return pm;
    }
};

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Are there any reasons? Am I doing somthing wrong?