Comment 5 for bug 1226612

This is behaving correctly on touch screens. Pinch to zoom does in fact work (per jibel). I am going to mark this bug as fixed.

It does not work on track pads and will not work. The track pad events are treated as mouse events and not given to Qt as gesture events. We will not be able to fix this.

Regarding unzoom, that is tracked as a different bug here:
https://bugs.launchpad.net/ubuntu/+source/gallery-app/+bug/1289160