Qt - QImage is there a method to paste Qimage into another Qimage?

问题

I am looking for a way to simply paste some Qimage into bigger one, starting with some given (x,y). Now, I am copying pixel by pixel all Qimage.

回答1:

Yes, use a QPainter to paint into a QPaintDevice, QImage is a QPaintDevice, so it works.

回答2:

QImage srcImage = QImage(100, 100);
QImage destImage = QImage(200, 200);
QPoint destPos = QPoint(25, 25);  // The location to draw the source image within the dest

srcImage.fill(Qt::red);
destImage.fill(Qt::white);

QPainter painter(&destImage);
painter.drawImage(destPos, srcImage);
painter.end();

来源：https://stackoverflow.com/questions/3602482/qt-qimage-is-there-a-method-to-paste-qimage-into-another-qimage