Thank you for your reply,

I am not sure to understand. Are you working on your own version? When will it be available?

There is no emergency but if you are not planning to merge until the next week, would you agree to share the patch?

Another question: 

Isn't a full resolution FBO bad for the performances?

Also, what about the touch events? Would we have to process them with that solution?

Baptiste

(just merged)

This version of Cinder has events for orientation, location services, etc.  Check out the iPhoneAccelerometer (this one is different from master) and iPhoneLocation samples.

No, just rendering one frame to a FBO and then using that as a texture on a quad you rotate should not be a performance hit.  Not sure what you mean about processing touch events.

Great, thank you.

About the touch event, I was asking if rotating the images still display them at there position on the screen. If a Rectf::contains would return true if the finger is in the displayed Rect. Sorry if I am confusing.

I will try it tomorrow anyway.

Ok, it seems that this is not what I was looking for. 

When you turn the screen at 90 degrees, the x become at the vertical and the y at the horizontal. As your image is rotated, there is no more coherence between the touch position and the display position.

Am I wrong? How to handle that?

I personally have some wrapper code that adjusts the coordinates of the input event based on the rotation. The below code is what I use to convert an unrotated position to a correctly rotated (it probably won't work exactly as is, I have a special enum for orientations and already have the actualWidth and actualHeight reflecting the orientation):

Thank you both for your help.

However, I am surprised that there is no better solution. As far as I remember in objective-C, when you rotate your screen, it also rotate the axis. I will take a look at that during the next week.

And I think that Letsgoout touch transformation is appropriate.