On Saturday 17 October 2015, Celal SAVUR wrote: > Hello everyone, > > I have some performance issue when I am using QPixmap. > > I am getting image from buffer and I create QImage. After that using > QPixmap::fromImage(), creating pixmap and set it to QGraphicPixmapItem to > be drawn in scene. > > When I put the timer to see how much time Qt spending to create QPixmap, I > realize that I converting from Qimage to QPixmap taking ~20 times more > time than crating Qimage from buffer. > > By the way, I am getting image approximately every 200 ms some times faster > than that. > > Do you have any suggestion to increase the performance? > You can convert a QImage into a QPixmap without image conversion by using the flag Qt::NoImageConversion on QPixmap::fromImage. Note though that this means the image will not be converted to an efficient type for painting to (which pixmaps normally would be), but if you are only painting from it a few times it might be more efficient overall.
`Allan _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
