This is definitely an app level design. An imaging SDK should not keep track of this, but you should in your application. Different people do it in different ways, whether a resource manager, a history stack, or just simple flags, its up to you.
Best of luck,
Here is a list of all the events of the GdViewer, among them is the RotationChanged event:
http://guides.gdpicture.com/v9/html/con ... iewer.html
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