Re: [xmlroff] DocBook to PDF with xmlroff

[Tony G. <Ton...@Su...>]

Tim Waugh <tw...@re...> writes:
> On Thu, Mar 10, 2005 at 04:41:49PM +0000, Tony Graham wrote:
..
> Oh, now that I look more closely, it's the fo:external-graphic ones I
> wanted.  The background-image things were for 'draft'-type watermarks,
> and they come from docbook-xsl.
>
> So is that more difficult?

Oh, yes.

The simple answer:

 - Implement the graphic handing in FoDocGP that used to be in
   FoDocPDF.

 - Modify PangoXSL to walk the PangoLayout after it's been rendered
   and call the callback for each graphic.

The correct answer:

 - Rewrite the "inline" FOs so they create areas (rather than, as at
   present, their containing FoBlock walks the FO tree to build a
   PangoAttribute list).

 - Make the FoAreaLayout walk its contained areas to build the
   PangoLayout.

 - Make an FoAreaGraphic that holds the callback for printing the
   graphic.

 - Modify PangoXSL to walk the PangoLayout after it's been rendered
   and call the callback for each graphic.

 - Submit a Pango enhancement request once the callback technique is
   shown to work so the callback handling goes into core Pango.

 - Make an FoImage datatype (or similar) so you don't have to have
   multiple copies of a graphic file when there's multiple references
   to the same external graphic.

Regards,


Tony.