[poppler] Font List of PDF Files

[suzuki toshiya]

The embedded fonts in PDF are expected to have the randomized prefix
(please check PDF spec). If without randomized prefix, it is difficult
to merge multiple PDFs with different subsets of same font (if a document
using only the digits of Courier, and another document using only the
Roman alphabets of Courier - to merge them, PDF interpreter should break
2 embedded fonts and merge 1 font? It's complex work!).
Also using randomized prefix makes it easy to create per-page subsetted
TrueType fonts.

Adobe Reader "kindly" removes the randomized prefix and show unique
family names only, maybe for the users who are unfamiliar with the design
of PDF structure.

Regards,
mpsuzuki

cobra.yu wrote:
> Dears,
> 
>    When opening some PDF files with poppler_qt4viewer in qt4/demos, it shows some font names in View->Fonts with strange "Prefix"es.
>    For example, viewing with Adobe Reader, the font name is "DINPro-Regular", but poppler-qt4 shows "ELONDC+DINPro-Regular".
>    Sometimes, duplicate font names appear in the font list with different strange prefixes, like "VUQIMU+DFLiHeiStd-W5", "DDDFUE+DFLiHeiStd-W5", "KSKUOQ+DFLiHeiStd-W5" and so on.
>    What does this mean? Tks a lot.
> 
>              Cobra
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