Bug#1116194: kimageformat6-plugins: Add compile-time support for webp

[Aurélien COUDERC <libre@coucouf.fr>]

Le mercredi 24 septembre 2025, 11:46:57 heure normale d’Europe centrale Marcus Hardt a écrit :
> Dear Maintainer,

Hi,

> I've upgraded the image management digikam, a kde application, which
> relies on QT.
> 
> Digikam developers have switched from PNG to WEBP during the upgrade (I
> think it was from 8.6.0 to 8.7.0). Since then some functions using WEBP
> don't work. (The easiest way to reproduce is to check if digikam still
> displays the "splash-screen" on startup.
> 
> In the bug I filed on digikam (https://bugs.kde.org/show_bug.cgi?id=509633)
> the developers claim that they use QT libs for loading WEBP. QT does
> support WEBP, only if support is added at compile time.
> 
> Would it be possible to do this?

we *do* compile qt6-imageformats with WebP support. See [1] :

Further Image Formats:
  JasPer ................................. no
  MNG .................................... yes
  TIFF ................................... yes
    Using system libtiff ................. yes
  WEBP ................................... yes
    Using system libwebp ................. yes

So I’m not sure what’s missing.

[1] https://buildd.debian.org/status/fetch.php?pkg=qt6-imageformats&arch=amd64&ver=6.9.2-3&stamp=1761474622&raw=0

I’ll comment on the upstream bug.


Happy hacking,
--
Aurélien