[gs-bugs] [Bug 689942] New: GSview draws blank page when viewing next page on some files

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

http://bugs.ghostscript.com/show_bug.cgi?id=689942

           Summary: GSview draws blank page when viewing next page on some
                    files
           Product: GSview
           Version: unspecified
          Platform: PC
        OS/Version: Windows 98
            Status: UNCONFIRMED
          Severity: normal
          Priority: P4
         Component: General
        AssignedTo: gsview at ghostgum.com.au
        ReportedBy: goldart.geo at yahoo.com
         QAContact: gs-bugs at ghostscript.com


When viewing files such as alphabet.ps, colorcir.ps, escher.ps, grayalph.ps,
snowflak.ps, vasarely.ps, waterfal.ps from Ghostscript distribution, or
twopages.ps bundled with PSTOEDIT, Ghostscript returns message 'No more pages'
at status line when trying to view the contents of next page. When the message
is shown, the document window shows a completely blank page.

After the page goes blank, document window remains empty until the document is
reopened.
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Ghostscript version (or include output from "gs -h"): 8.62
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Where you got Ghostscript: Ghostscript.com
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Hardware system you are using (including printer model if the problem
involves printing):

Memory: 384MB
CPU: Intel Pentium II 400
Sound: ESS Solo-1
Video: Neomagic MagicMedia 256AV
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Operating system you are using: Windows 98SE
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Suggested fix, if any:

GSview must not draw blank pages when user tries to navigate beyond a document
that has no page information. For document with no or incomplete page
information, GSview should decide the number of pages a document contains by one
of following methods:

1. Calculate the pages based on the amount of canvas space the document
consumes, dependent on media size.
2. Assume it has only 1 page, with page size equal to the amount of canvas space
the document consumes.

Method 1 should be used for media with fixed canvas sizes, such as print. Method
2 should be used for media with variable canvas sizes, such as screen. GSview
should support both views when viewing a document.



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