[pdf-devel] Bugfix in prediction filter

[Georg Gottleuber]

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Hi,

I used prediction filtering with real images and found a great
mistake: parameters for predictor types inside PDFs are
1,2,10,11,...,14 (see ISO 32000-1) but values for writing inside the
PNG stream are 0,1,2,3,4 (see RFC-2083).

So we have to add/substract 10 (or PDF_STM_F_PREDDEC_PNG_NONE, which
is defined to 10).

A patch for this bug is attached. Please merge it.

Regards,
Georg
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pdf-stm-f-pred.patch
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