[poppler] Font List of PDF Files

[cobra.yu]

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