support clipboard

[lizhuangs]

support copy image to clipboard,Tks~

[juherask]

I agree, this would be really nice feature.

[duckduck1]

Missing that feature, too. It would keep Viewnior simple but functional.

[JakkuSakura]

It would be very helpful to post pics in Github issues. Currently, I use my screenshot.

[ppdeassis]

Looking forward to it too.

[AlbertHamik]

Not to hijack this too much but would it be possible to do the reverse, pasting from clipboard into Viewnior? In Windows I often use the paste image feature of Irfanview to confirm how a screenshot turned out. If I need to start another thread for this I can.

[hajonnes]

I agree, both functionalities would be really nice.

[cpontvieux-systra]

Ristretto can do it, is free and is also in C, so it may be simple to borrow the code…

[Edit]
I found this:
https://gitlab.xfce.org/apps/ristretto/-/blame/master/src/main_window.c?ref_type=heads#L4314

{
    GdkPixbuf *pixbuf;
    RsttoImageViewer *viewer;
    viewer = RSTTO_IMAGE_VIEWER (window->priv->image_viewer);
    pixbuf = rstto_image_viewer_get_pixbuf (viewer);
    if (pixbuf)
    {
        gtk_clipboard_set_image (gtk_clipboard_get (GDK_SELECTION_CLIPBOARD), pixbuf);
        g_object_unref (pixbuf);
    }
}

GTK is already a dependency for Viewnor, the only requirement is to get a GdkPixBuf reference of the shown image, which should be pretty easy.
Official Gtk doc for clipboard

• One new action should be added here and here
• The UniImageView has a pixbuf attribute, so it’s all there
• UNI_IMAGE_VIEW(window->view) seems to get the UniImageView from the widget
• A new function should probably need to be added in some of the uni-XXX.c files

If nobody do it first, I may try to fill a merge request is the following days at is seems pretty simple.