[gs-bugs] [Bug 690151] New: Text in PDF file does not render

[bugs.ghostscript.com-bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=690151

           Summary: Text in PDF file does not render
           Product: Ghostscript
           Version: 8.63
          Platform: PC
               URL: https://share.acrobat.com/adc/document.do?docid=c1f9bcd7
                    -c3e8-4f9f-a8f4-b244e5533ff3
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: major
          Priority: P4
         Component: PDF Interpreter
        AssignedTo: alex.cherepanov at artifex.com
        ReportedBy: heysakshi at gmail.com
         QAContact: gs-bugs at ghostscript.com


For certain PDF files, text does not render in GS based viewers. The bug has 
been observed on Win XP (GSView) and Ubuntu (gv). 
A bug file is shared at https://share.acrobat.com/adc/document.do?
docid=c1f9bcd7-c3e8-4f9f-a8f4-b244e5533ff3. It was created by running OCR on a 
scanned document in Acrobat 9.0:
1. Open a scanned file and launch Document->OCR Text Recognition->Recognize 
text using OCR.
2. Click on Edit and select the PDF Output Style to be ClearScan.

Observations:
Win:
1. Open the bug file in GSView for Windows.
2. The file does not open. The messages log opens with the following text:
<...>
Error: /undefined in --get--
Operand stack:
   --dict:7/7(L)--   C0_0   10.05   --dict:7/7(L)--   --dict:7/7(L)--   Fd3821-
Identity-H   --dict:11/12(ro)(G)--   --nostringval--   --dict:7/7(L)--   --
dict:7/7(L)--   --dict:18/22(L)--   --nostringval--   --dict:2/2(L)--   
packedarraytype
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --
nostringval--   2   %stopped_push   --nostringval--   --nostringval--   
false   1   %stopped_push   1873   1   3   %oparray_pop   1872   1   3   %
oparray_pop   1856   1   3   %oparray_pop   1739   1   3   %oparray_pop   --
nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--
   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --
nostringval--   --nostringval--   --nostringval--   %array_continue   --
nostringval--   false   1   %stopped_push   --nostringval--   %
loop_continue   --nostringval--   --nostringval--   --nostringval--   --
nostringval--   --nostringval--   --nostringval--   %array_continue   --
nostringval--   --nostringval--   --nostringval--   --nostringval--   --
nostringval--   --nostringval--   --nostringval--   --nostringval--   %
loop_continue   --nostringval--
Dictionary stack:
   --dict:1149/1684(ro)(G)--   --dict:2/20(G)--   --dict:79/200(L)--   --
dict:105/127(ro)(G)--   --dict:259/300(ro)(G)--   --dict:21/25(L)--   --
dict:4/6(L)--   --dict:25/40(L)--   --dict:7/7(L)--
Current allocation mode is local
pdf_page failed

Ubuntu:
1. Open the bug file in gv.
2. All images render but the text does not.


Additional Information:
1. The file renders fine in other PDF Viewers like Adobe Reader and Apple 
Preview.
2. It looks like the GS Interpreter cannot handle the indirect object in 
entries like /Font/W[0 29 0 R]. A similar file in which 29 0 R is replaced 
with a direct array renders fine.



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