Linux: write images to clipboard....

tools/gtk_clipboard_dump/gtk_clipboard_dump.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <gtk/gtk.h>
 #include <stdio.h>
 #include <string.h>
 
 /* Small program to dump the contents of GTK's clipboard to the terminal.
  * Feel free to add to it or improve formatting or whatnot.
@@ skipping 12 matching lines @@
 
   for (int i = 0; i < num_targets; i++) {
     printf("  [format: %s", gdk_atom_name(targets[i]));
     GtkSelectionData* data = gtk_clipboard_wait_for_contents(clip, targets[i]);
     if (!data) {
       printf("]: NULL\n\n");
       continue;
     }
 
     printf(" / length: %d / bits %d]: ", data->length, data->format);
+
+    if (strstr(gdk_atom_name(targets[i]), "image")) {
+      printf("(image omitted)\n\n");
+      continue;
+    }
+
     for (int j = 0; j < data->length; j++) {
       // Output data one byte at a time. Currently wide strings look
       // pretty weird.
       printf("%c", (data->data[j] == 0 ? '_' : data->data[j]));
     }
     printf("\n\n");
   }
 }