It might be better to produce a svg and then display the svg trough cairo.
I don't know if there are bindings available in OCaml to do that (mainly for
librsvg).

2009/12/1 Eric Cooper <ecc@cmu.edu>

> On Tue, Dec 01, 2009 at 02:09:27AM +0000, Ewen Maclean wrote:
> > I am generating pdf images from latex source, and I would like to
> > show them on screen in part of a pane in lablgtk2. Is it possible to
> > do this using a GImage widget or something similar?
>
> I think you will have to render the PDF first into a simple image
> format like PPM, and then use GTK to display that.  I don't know of
> any OCaml bindings for libpoppler, but you can use the standalone
> program "pdftoppm" from the poppler-utils package.  Then you can
> display the .ppm file as follows:
>
>    let file = Sys.argv.(1) in
>    GMain.init ();
>    let window = GWindow.window ~title: "Show Image" () in
>    let image = GMisc.image ~file ~packing: window#add () in
>    window#connect#destroy ~callback: GMain.quit;
>    window#show ();
>    GMain.main ()
>
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