Hi all
With pdf-image, is there any way to coalesce or merge multiple different
subsets of the same font into a single font subset with no duplicate
glyphs? Eg 50 different "Helvetica (subset)" instances into a single
font in the output document?
Background:
I've just got Jeremias's pdf-image extension integrated into my code. It
worked perfectly and immediately with little effort, which was
delightful. Thankyou *VERY* much Jeremias for publishing that, it's a
fantastic tool and I'd love to see it in fop core.
I'm encountering an unexpected issue with it, though: the PDFs produced
by fop are *huge*. Examination with Acrobat Pro suggests that 90% of the
space is taken up by fonts. Looking at the font list, I see huge numbers
of copies of "Helvetica (subset)", "Helvetica Black (subset)" etc. That
makes sense, since all the input PDFs have fonts embedded, and many use
the same fonts. However, I'm including up to 1000 PDFs in each output
PDF so the size adds up to prohibitive levels.
I'm wondering if there's any way to tell the pdf-image extension to
embed certain fonts fully from supplied font files and avoid copying the
matching subsets over from the input PDFs. If there isn't anything like
that, any idea how practical it'd be?
For that matter, is the idea of collecting up all the subsets of a font
as each pdf-image is embedded, then merging them into a single new
embedded subset at the end completely insane? Or is it potentially
practical? For that matter just keeping track of which glyphs are
defined in each subset and building a new subset from a master font file
at the end that included all those glyphs would help a lot.
I'm *really* hoping to avoid having to keep on using EPS input and
PostScript output to PDF via Distiller, so I'm willing to put some work
into this.
--
Craig Ringer
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