[Qt-interest] Get raw data from QImage

[Cole, Derek]

Hello,

I have populated a QGraphicsPixmapItem with an image using code similar to the following:

    QImage *qi = new QImage(imwidth, imheight, QImage::Format_RGB32);
        for (int i = 0 ; i < imheight ; i++)
        {
             for (int j = 0 ; j < imwidth ; j++)
             {
                    qi->setPixel(j,i,qRgb(imageData[i*imwidth+j],imageData[i*imwidth+j],imageData[i*imwidth+j]));

             }
         }

    QPixmap p(QPixmap::fromImage(*qi,Qt::AutoColor));
    if(scene.items().contains(item)){
        scene.removeItem(item);
        item->~QGraphicsItem();
    }
    item = new ImagePixmapItem(p);
    scene.addItem(item);

Now I want to get the data back from one of those QGraphicsItems and I am using some code like this to get the QImage of a particular part of the image:



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