Re: [gtk-osx-users] Pasting images from clipboard

On Feb 9, 2016, at 2:27 AM, Miroslav Rajcic <mrajcic hotmail com> wrote:

Is pasting images from the clipboard supported in GTK 2.x for OS X?
In my app, the same code doesn't work on OS X but works OK on all other platforms (Windows, Linux, BSD, 

Actual code goes like this:

- paste is initialized by call to:
    GtkClipboard *clipboard = gtk_widget_get_clipboard (g_text.m_pWidget, GDK_SELECTION_CLIPBOARD);
    gtk_clipboard_request_targets(clipboard, OnPasteClipboardTargetsReceivedFunc, NULL);

- inside OnPasteClipboardTargetsReceivedFunc callback, I do actual pasting with:
    if(gtk_targets_include_image(atoms, n_atoms, FALSE)){
        GtkPixbuf *pixbuf = gtk_clipboard_wait_for_image(clipboard);
            gtkMessageBox(_("Failed to open image from the clipboard!"));

This GTK API call fails consistently all the time (returning NULL) on OS X (triggering error message box 
Is this a known issue?

Note that pasting works OK for other types of content (text, RTF), but naturally I use different calls to 
fetch those.
The app is bundled with all image loaders, inserting image from file works OK, only clipboard operation is 

How are you putting the image into the clipboard and what kind of image is it? The quartz clipboard functions 
are implemented separately from the other platforms in gtkclipboard-quartz.c:

gtk_clipboard_wait_for_image (GtkClipboard *clipboard)
  const gchar *priority[] = { "image/png", "image/tiff", "image/jpeg", "image/gif", "image/bmp" };
  int i;
  GtkSelectionData *data;

  for (i = 0; i < G_N_ELEMENTS (priority); i++)
      data = gtk_clipboard_wait_for_contents (clipboard, gdk_atom_intern_static_string (priority[i]));

      if (data)
          GdkPixbuf *pixbuf = gtk_selection_data_get_pixbuf (data);

          gtk_selection_data_free (data);

          return pixbuf;

  return NULL;

Note that it will only handle the 5 image types in the "priority" array. 

John Ralls

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