Show Images with Pixmap: Memory

TauCeti

Hello,
I want to display a large number of images with large size (each >100 MB).
They should be displayed as a small preview picture with low resolution.
Is it possible to avoid that they are all loaded into memory?

What could be the proper way of doing it?

Thanks for help.

Christian Ehrlicher

@TauCeti said in Show Images with Pixmap: Memory:

What could be the proper way of doing it?

Load them, create thumbnails and only store them in memory.

TauCeti

Still not sure how to solve this.

QIcon thumbnail = QIcon(Pixmap::fromImage(image));

QLabel *img = new QLabel(tab);
img->setPixmap(QPixmap("..."));
img->scaledToWidth( .. );

How do I create thumbnails? Just load them to a QIcon or QLabel with
different size?

J.Hilk

@TauCeti
for example this creates a QVector filled with scaled (100 x 100) QPixmaps of a given folder

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QVector<QPixmap> myThumbNails;
    
    
    QDir dir(pathToImages);
    const QStringList entries = dir.entryList(QDir::Files);
    const QString path = pathToImages + QString("/%1");
    for(const QString &image : entries){
        QPixmap imgOrginal(path.arg(image) );
        if(!imgOrginal.isNull())
            myThumbNails.append(imgOrginal.scaled(100,100,Qt::KeepAspectRatio));
    }

    return a.exec();
}