[request] Webp support

Could you please add .webp format support to Viewnior?

[hellosiyan]

Viewnior uses gdk-pixbuf under the hood, which does not support WebP.

[Martina-Neumayer]

Yeap.. it will be a very nice to have an update for some new versions of the image formats.
Viewnior is super but lot's of images recently are simply not recognizable by the app.

[debarshiray]

There's an out-of-tree WebP backend for GdkPixbuf:
https://github.com/aruiz/webp-pixbuf-loader

Installing it should unlock WebP support.

[Martina-Neumayer]

@debarshiray Yes.. I know about it, but sadly, for me don't works.
I am using now on my Arch viewer from the XnViewMP package and it works ootb with all fileformats I need without any issues.

[debarshiray]

@Martina-Neumayer That's sad to hear. If you still have a WebP file which it failed to decode, then it might be worth filing a bug. I don't use WebP much myself, but I know the author of that decoder. :)

[Martina-Neumayer]

@debarshiray Nope, I don't have any. The entire issue was "caused" by the add-on in the Chrome/Chromium browser which enable to save some pictures, gfx etc even if they are let's say.. not mentioned to save ootb ;) I mean by Image Toolbar add-on. And there was somehow a glitch manifested itself by saving jpg files as a webp. Strange, but it was so.
I am not entirely sure if it was only through (because) the add-on or also through some error in the system. After I migrated to Arch there is no issue at all anymore and the add-on preserve original fileformat by saving as it should be.
I think (for 80% of certainty) that this was a system related problem. But I did not have much free time those days to digg this issue a bit deeper. You know.. work and other my duties.
Sadly, that Mint is no longer as stable and unproblematic as it was before v18 and v19.

[Gooberpatrol66]

Weirdly, viewnior can open webps on one of my computers but not the other. Both running gentoo. I can't figure it out.

[Necklaces]

@Gooberpatrol66

Weirdly, viewnior can open webps on one of my computers but not the other. Both running gentoo. I can't figure it out.

Pretty sure you've installed webp-pixbuf-loader on one and not the other. There's literally no other way for it to work.

[Gooberpatrol66]

Yes, that was it. Thanks.

[Rava77]

I use viewnior 1.4-2 on a Slackware based system. I installed webp-pixbuf-loader-20191003.fb04954-x86_64-1_slonly - that is the most recent package to be found. Still viewnior insists on Couldn't recognise the image file format for file 'file.webp'
Could it be that I need to restart the system because even after installing webp-pixbuf-loader viewnior still uses the old gdk-pixbuf?

[Gooberpatrol66]

I don't remember restarting.

[Rava77]

I don't remember restarting.

Then what could be the reason it is not working in my case? Any ideas?

[Necklaces]

@Rava77 You installed it with sudo ninja -C builddir install, right? That meson build script should have run sudo gdk-pixbuf-query-loaders --update-cache to update /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache.

I guess you could check if it did by doing cat /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache | grep webp, if it returns nothing, try running sudo gdk-pixbuf-query-loaders --update-cache manually.

If it still doesn't work you have to check if the library is even installed, do a ls /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders/ and make sure libpixbufloader-webp.so is there.

Edit: the paths might be slighly different on Slackware.