If I understand your question correctly, you are saying that the
performance meets your needs, so you are mainly asking if there are any
hidden "gotchas" in that API?
If we are in a hw accelerated pipeline then I think the flipping is
probably guaranteed to be free since image transformation is accelerated
naturally and cheaply by most any GPU.
If we are in sw then the code will end up in the image transform
pipelines which have slightly more overhead than the straight copy
loops, but probably nothing noticeable when compared to manually
flipping the image through any other means.
On the other hand, if you are dealing with the results of a 3D scene
then I'm guessing you are only concerned about running on a 3D
accelerated GPU and so the prior comment about "it's free on HW" is the
more germane comment...
...jim
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