[rayman2000]

   
Here is an example page. This is a single page of the PDF, containing two real-life pages side-by-side in a landscape-oriented page. I would like to view the pages one after the other while paging, instead of seeing both of them at the same time. Ideally, I would be able to do this without manually cropping each page.
I know that the inverse of this is already supported: for a portrait-format PDF, I can display first the top half and then the bottom half while using the device in landscape orientation. I am trying to do the opposite: for a landscape formatted PDF, display first the left-hand side and then the right-hand side while using the device in portrait orientation.