Carbon-Quartz docs?

I have posted this same question on the mozilla.layout board, so please
excuse the reposting....


I am trying to find some good references to the Carbon-Quickdraw
interface. Specifically, I am trying to get a better handle
on calls like....

<<<<<<<<<<<<<<<<<

OSErr err = ::QDRegionToRects(mRegion, kQDParseRegionFromTopLeft, 
&RegionToRectsCallback, sink);

 >>>>>>>>>>>>>>>>>

Everywhere I look points me to the same API docs in the Apple
developer guides; but aside from describing the parameters, I can't seem 
to find anything that goes into any detail. I've even tried the old 
"Inside Macintosh" docs to try and find something that sounds or looks 
like this Carbon function, but no luck.

Any suggestions of where this function is better described?

Thanks