Render to bitmap?

[Steve Sloan]

I'm working on a DirectShow source filter for HTML (with CSS and JS).  I've 
kludge up something with IE and ActiveX, but it's nasty, and I was hoping to 
do better with Mozilla.  I've hacked the winEmbed embedding sample until it 
suits  my purposes, but the crucial piece is getting mozilla to render to a 
bitap instead of a window (a.k.a. a screenshot), and notify me (in some way) 
when the page changes

The only solution that I can see is in the second argument to 
nsIBaseWindow::InitWindow, which is a parent widget.  From looking through the 
code, it appears to use the parent widget (and its device contexts) instead of 
the parent window, if it's specified.  I could come up with a fake widget with 
fake contexts to fool it into drawing in it.  I was hoping someone might know 
of an easier way, but no amount of Googling has come up with anything.

Any help, please?
Thanks ...
-- Steve
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