> make this a g_object with signals for completed, changed, etc.
d> fix region computation rounding when updating scaled image in 'area ready' signal.
> fix delay flip 'completed' signal (full screen busy cursor is not always turned off)
- > fix slow loading of images when zoomed out - bug could be poor clamping to visible in PixbufRenderer.
+ d> fix slow loading of images when zoomed out - bug could be poor clamping to visible in PixbufRenderer.
> work on pan view: