Sorry, I am a bit short on time but even if I were not, I am not going to run a random exe. No offence intended, just a personal policy.

However, to expand on this...

...I would have a look at what's behind your getCurrentImageArea(), zoomImage() and setZoomFactor() and why are both zoomImage() and setZoomFactor() called each time. Maybe only one needs to be called?

Here is an excellent example of a simple image zooming code, straight from the creators of Qt:

http://qt-project.org/doc/qt-4.8/wid...ageviewer.html

It might be a good idea to have a read through that article. It is quite long and a bit fragmented (it never shows the whole code), so to fully comprehend it you may need to read it front to end. It may not fit your specifications exactly but it may give you some inspiration.