[Okular-devel] [okular] [Bug 337209] New: Djvu files not displayed if zoom above ~150%

[Matteo Italia]

https://bugs.kde.org/show_bug.cgi?id=337209

            Bug ID: 337209
           Summary: Djvu files not displayed if zoom above ~150%
    Classification: Unclassified
           Product: okular
           Version: 0.19.2
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: DjVu backend
          Assignee: okular-devel at kde.org
          Reporter: kde at mitalia.net

Created attachment 87634
  --> https://bugs.kde.org/attachment.cgi?id=87634&action=edit
A djvu file that exposes the problem at 152% of zoom

As in title. With all Djvu files I have (some downloaded from the Internet,
some created just to check this issue with pdf2djvu*), zooming more than ~150 %
results in a white image being displayed instead of the actual (zoomed) file
content; zooming back the page is rendered correctly.

I say ~150% because, depending on the files, it seems that there are some
variations in the exact zoom level, probably it's related to the zoom level
relative to the actual pixels stored inside the Djvu page.

I attach a document that exhibits the problem (in this case, on my machine at
152% of zoom).

* pdf2djvu --version reports "pdf2djvu 0.7.17 (DjVuLibre 3.5.25, poppler
0.24.5, GraphicsMagick++ 1.3.18, GNOME XSLT 1.1.28, GNOME XML 2.9.1)"

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