a question of Export custom file format?

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HI:
 
I need to develop an extension program of openoffice's write, 
the extended function is export a custom file format
, the file format similar as PDF file format ,
But not the PDF file format.
 
I analyzed the export of PDF files ,the Function  through VCL output.
I have two question as below:
 
1)Such  need can be achieved in extension of openoffice's write?
2) Can I use 
calss VirtualDevice
calss GDIMetaFile
interface---   Reference <XRenderable> xRenderable (mxSrcDoc, UNO_QUERY)
in openoffice's write?