Successfully updated digiKam G’MIC plugin to G’MIC 4.0.3

Software G'MIC
1

Successfully updated digiKam G’MIC plugin to G’MIC 4.0.3 (lots of help from ChatGPT as I’m not really a coder)

Hi all,

I recently noticed that the current digikam-gmic-qt plugin from the github repository of @hdynamo still ships with libgmic 3.6.0, while the current G’MIC release is 4.0.3.

Purely as an experiment, I followed the update procedure described in UPDATE.md and managed to successfully update the plugin to G’MIC 4.0.3.

Test environment

  • Manjaro Linux
  • digiKam 9.1
  • Qt 6
  • Clang 22
  • G’MIC 4.0.3
  • CImg 4.0.3

Result

The plugin compiles successfully, installs correctly and is loaded by digiKam.

The About dialog now reports:

Libcimg version: 403
Libgmic version: 403

More importantly, the online filter definitions can be updated successfully again (this failed with the old bundled 3.6.0 version), and I have tested a number of filters successfully.

Things I encountered

The update procedure in UPDATE.md is still largely correct, but I ran into a few issues:

  • the top-level gmic repository also has to be present during the update;
  • CImg.h must come from the same release as G’MIC (otherwise the build automatically downloads the latest CImg, resulting in a version mismatch such as 403 vs 404);
  • Patch 07 appears to be already included in Patch 01;
  • one source change was required because gmic::init_rc() now returns void instead of bool.
QFileInfo pathInfo(qpath);

if (!pathInfo.isDir() && create) {
    gmic::init_rc();
    pathInfo.refresh();
}

if (pathInfo.isDir()) {
    result = qpath;
} else {
    result.clear();
}

Apart from that API change, I did not need to make any functional changes to the plugin itself.
I also documented the complete update process from a clean checkout. If useful, I can post a step-by-step guide.

1 Like