Add a color picker plugin

[pandaroux007]

Good morning!
I don't know how to create new plugins for xviewer unfortunately, I would have taken care of it myself but I don't know how to do it, so I'm offering it here.

Sometimes I need to extract an exadecimal color from an image. To do this, as I can't use xviewer, I use Firefox or Inkscape, but it takes longer and Firefox, for example, doesn't support this feature on SVGs.

Is it possible to create such a feature (a "color picker") directly in xviewer, like the one in firefox but which also works for svg for example? Here is a preview of the feature (in French, sorry) :

simplescreenrecorder-2025-03-15_12.40.11.mp4

To open this function in Firefox to try it out, use F12. Once you are over the spot in the image with the correct color, left-click: the exadecimal color will be in your clipboard!

Thanks for your great work here and on xviewer!
Sincerely,
Pandaroux007