Format Plug-in: How to access the "Background" layer?

Hello all.
I've been working on a Photoshop file format plugin, and for the most part, it's nearly done. However, while testing, I ran into a little problem. While it seems to work great, if there's at least one layer, it fails miserably if a "flat" image is being saved
It appears that, presumably because there aren't any layers,(i.e. layerCount=0), that no pixel data is available for converting/saving. Now the question is, how is one supposed to compensate for this? Is there a way, through the API, to either force Photoshop to promote the Background layer to a proper layer? Or some other way of accessing the pixelData for that layer?
I mean, I'd rather not have to force users to take extra steps prior to saving - as that just seems sloppy. So I'd appreciate it if someone could clue me in to how to respond to this.
Thanks,
Sean

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