I once wrote a QuartzPath IDL file, based on the Quartz 2D API from 
Apple, 
http://developer.apple.com/techpubs/macosx/CoreTechnologies/graphics/Quartz2D/Quartz_2D_Ref/qref_main/index.html

I'm attaching Quartz.idl. Anyone looking into an API for complex paths 
may want to look at this.