[Okular-devel] [okular] [Bug 332928] New: wrong usage of desktop DPI in ePub fonts

[Diggory Hardy]

https://bugs.kde.org/show_bug.cgi?id=332928

            Bug ID: 332928
           Summary: wrong usage of desktop DPI in ePub fonts
    Classification: Unclassified
           Product: okular
           Version: 0.18.3
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: EPub backend
          Assignee: okular-devel at kde.org
          Reporter: kde at dhardy.name

Normally screen's DPI (KDE System Settings → Application Appearance → Font
Settings → Force Font DPI) is set to about 100; I have it set to 250 since I
have a very high DPI screen (Lenovo Yoga 2 Pro).

The font in an ePub book seems to depend on the desktop DPI. It shouldn't,
since the font size relative to a page should be fixed and the page size scaled
to fit the screen. What this means is that I see very few words per page
(around 5 per line, 12 lines per page in one sample), which is nearly unusable.
I have checked that setting the DPI lower increases words per page.

I'm guessing there is meant to be a way to control the "font size relative to a
page", but desktop DPI shouldn't be that control. In my case I can have two
large pages side-by-side each over 1000 pixels wide but containing very few
words or I can shrink the pages to get a reasonable font size but leave half
the screen unused (and very short lines of text).

Reproducible: Always

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