There are documents without the %%Page comments, that gs (and gv) can render only incrementally (ie one page after another), without possibility to go back to the previous page or navigate to a specific page. One example of that is the document attached to: http://bugs.kde.org/show_bug.cgi?id=169530
*** Bug 20924 has been marked as a duplicate of this bug. ***
Indeed, the following file (without any comments) does not draw anything in Okular: .5 .5 scale 100 100 translate .5 setgray 0 0 1000 1000 rectstroke 10 dict begin /ob 50 def /barv .3 def /stw 100 def /h1 1000 ob add barv mul def /h2 h1 stw add def /w2 stw h2 1000 ob add div 500 mul add def /l2 2 500 w2 sub mul def /h3 500 ob add l2 mul 500 div def 0 setgray 0 0 moveto 500 1000 ob add rlineto 500 -1000 ob sub rlineto stw neg 0 rlineto barv -500 mul h1 rlineto barv 1 sub 1000 mul stw 2 mul add 0 rlineto barv -500 mul h1 neg rlineto stw neg 0 rlineto closepath w2 h2 rmoveto l2 0 rlineto l2 -.5 mul h3 rlineto l2 -.5 mul h3 neg rlineto closepath eofill end showpage
(In reply to comment #2) > Indeed, the following file (without any comments) does not draw anything in > Okular: > It seems that %!PS-Adobe-* prolog is required, otherwise nothing is rendered. This feature is, however, undocumented.
(In reply to comment #3) > (In reply to comment #2) > > Indeed, the following file (without any comments) does not draw anything in > > Okular: > > > > It seems that %!PS-Adobe-* prolog is required, otherwise nothing is rendered. > This feature is, however, undocumented. It is documented in libspectre/ps.c; however, that file is not in the public API and therefore Doxygen does not process it at all. Also, the AUTHORS file should mention Timothy O. Theisen and Jose E. Marchesi because their code is used.
(In reply to comment #4) > Also, the AUTHORS file should mention Timothy O. Theisen and Jose E. Marchesi > because their code is used. And the README file should state "Contains code from ghostview".
*** Bug 29749 has been marked as a duplicate of this bug. ***
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