DjVu Viewing Helper
2022 Update: due to the commendable efforts of Forum user yura.beznos, there is now a proper DjView viewing app, and it's even available in the Jolla Store. So check out DjVu Viewer from there!
This installs a MIME type handler for DjVu files.
As there is no native support for that file type, I have chosen to do a workaround. The helper script will convert the djvu temporarily into PDF, and launch Sailfish Office (a.k.a. "Documents") to open it. NOTE: this conversion is not fast. You will have to excert some patience for the files to open.
Not ideal, but it allows you to view djvu files you have or encounter.
NOTE: after installation you have to enable the mime type handler in jolla-settings (available in the djvulibre-open-0.3.0 version).
To setup manually run these commands as regular user in the terminal:
lca-tool --setmimedefault image/vnd.djvu openrepos-djvulibre-open lca-tool --setmimedefault image/vnd.djvu+multipage openrepos-djvulibre-open lca-tool --setmimedefault image/x.djvu openrepos-djvulibre-open lca-tool --setmimedefault image/x-djvu openrepos-djvulibre-open
To avoid typing, you can get the little script from the git repo: https://gitlab.com/nephros/openrepos-djvulibre/-/raw/master/files/install-mimes-user.sh
I am looking for a way to automate this, but it's not possible from the RPM alone as it must be run as user. Possibly a one-shot systemd service can do it. Suggestions welcome.
BTW, this depends on my build of the djvulibre tools and libs. If you are a coder maybe you can use those to create a native application or plugin.
- Software Site: http://djvu.sourceforge.net
- Git repo: https://gitlab.com/nephros/openrepos-djvulibre
Category:
Application versions:
| Attachment | Size | Date |
|---|---|---|
 openrepos-djvulibre-open-0.1.1-1.noarch.rpm | 52.13 KB | 26/08/2020 - 16:43 |
| openrepos-djvulibre-open-0.1.1-2.noarch.rpm | 52.24 KB | 26/08/2020 - 17:37 |
| openrepos-djvulibre-open-0.2.0-2.noarch.rpm | 53.62 KB | 11/09/2020 - 16:33 |
| openrepos-djvulibre-open-0.3.0-4.noarch.rpm | 55.01 KB | 30/11/2020 - 19:33 |
| openrepos-djvulibre-open-0.3.1-3.noarch.rpm | 53.98 KB | 16/01/2022 - 13:51 |
Changelog:
(none)
Comments
sdiconov
Wed, 2020/09/02 - 18:06
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While the ability to open DJVU documents is great news, this app is indeed in a very early stage and leaves much to be desired. Nevertheless I am grateful to the author and hope that he can improve the app.
I installed the app and its dependencies and executed the suggested commands. Now an attempt to open a djvu from a file manager yields a message "Successful opening" ... and nothing else happens for a long time. However, when I manually launched the Documents app, it opened with the target djvu doc in it. Wow! I can see what is inside djvu files! ... But any attempt to zoom in small text shows that the converted pdf image is very low-res. Individual letters are barely recognisable if at all. This is a tool to preview, but it is not sufficient to read yet.
Problems:
1. very slow opening (coversion takes too long)
2. very low resolution (reading small text is hard or impossible)
nephros
Thu, 2020/09/24 - 20:25
Permalink
Newer versions now cache the conversion results (default 30 days), so long waiting times should be better now for files you look at often.
nephros
Thu, 2020/09/03 - 12:55
Permalink
Thanks for testing and your observations!
The long time to open is something I can do little about. The tool converts djvu first to PDF and this is not very fast depending on document size.
I will see what I can do about the resolution issue.
Right now what the script does is figuring out the device resolution ("DPI"), and convert the input to 1/4th of that DPI. Lowering that factor will improve quality, however I fear increasing quality will also increase conversion time.
Can you try if this improves quality for you?
https://gitlab.com/nephros/openrepos-djvulibre/-/blob/master/RPMS/openrepos-djvulibre-open-0.1.2-3.noarch.rpm