On Tue, 27 Feb 2007, Shachar Shemesh wrote:
Peter wrote:
Ghostview (gv) does almost exactly what you need. Take a look at how
it works. It uses gs for rendering.
Yeah, I know. gv doesn't do anything simple. It pretty much takes the
input file apart (assuming I understood what it does correctly).
Look, PS 'renders' pages in batches. The limits of a batch are usually
at 'showpage'. Then and only then does gs output things. showpage is a
PS command and it can be 'extended' easily by redefining it. The
interpreter should pause at each page with -dNOPAUSE, exactly after
showpage (or rather, inside it).
I don't know how gv pages backwards, it is possible that it saves state
and 'redoes' previous pages although I am not sure of this. gv does not
have a huge memory footprint even when rendering 200+ page documents and
it is very fast. So there must be a way. Imho get the source and take a
peek.
Peter
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