To Reduce loading time of Images Large Images

Phadnis

Hi,

I am loading large images of size 2MB in a ListView of QML.Still Images glitter.
If I reduce the size to 40KB then there is no glittering. So how can I remove glittering even if the size is 2MB.
I want to Reduce Loading time, should I use QImageReader along with QQuickImageProvider

Have gone through Qt Doc...... Performance Considerations And Suggestions and have met them

below is the code

void StatisticsImageProvider::run()
{

QString separator ="";
QString textDelimiter = ",";
CsvFileHandler::GetInstance()->processData(IMAGE_LIST_CSV_FILE,separator, textDelimiter);
QStringList list=CsvFileHandler::GetInstance()->getListOfImageKeys();
QString dirpath=QGuiApplication::applicationDirPath() + "/../Resources/image/TotalImages/"; 
for(int i=0;i<list.length();++i){
   QString path=dirpath+list.at(i)+".png";
   QPixmap map;
   map.load(path);
    map.scaled(253,250);
   map_Pixmap.insert(list.at(i),map);
}

}

QPixmap StatisticsImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
{
    QPixmap map(map_Pixmap.value(id));
    return map;
}

SGaist

Hi,

As soon as you use QImage or QPixmap, you'll use QImageReader. QQuickImageProvider allows you to pass whatever image you want to your QtQuick GUI. Whether it's a generated or loaded image doesn't matter.

If you have a set of large images, you should rather consider creating thumbnails that loads quickly and only load the full resolution images on demand.