I have some code that draws to a PtRaw widget using basic Photon API drawing calls (PgDrawIRect and such), from the draw
 function callback.

We would like to add a feature where we can save the content of these graphs to an image file (.png,.jpg, or pretty much
 anything else). I am not using offscreen contexts.

What would be the simplest/quickest way to tweak my code to make this possible? Note that I keep an internal buffer of 
my pixel values, so worst comes to worst I make a separate function that draws in the same way from this internal buffer
 to an image file -- but even that, I'm not sure what would be the simplest way to do it.

Let me know if you have suggestions,

Thanks,
Simon