FlipX a CCSpriteFrame

FlipX a CCSpriteFrame
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I added a set of sprite frames in sharedSpriteFrameCache with the method addSpriteFramesWithFile.

There are frames on that image those a need to duplicate, but flipping in X coordinate.

I want to create a new sprite frame, equal to one that is already in the sharedSpriteFrameCache but flipped and add it to the set of sprite frames in sharedSpriteFrameCache.

How do I do that?