Index: layer_vis.h
===================================================================
--- layer_vis.h	(revision 24266)
+++ layer_vis.h	(revision 24267)
@@ -50,6 +50,14 @@
 /* Return the last used layer (or if none, any layer) that matches target type */
 pcb_layer_id_t pcb_layer_vis_last_lyt(pcb_layer_type_t target);
 
+/* Use this to temporarily enable all layers, so that they can be
+   exported even if they're not currently visible.  save_array must be
+   PCB_MAX_LAYER+2 big. */
+void pcb_hid_save_and_show_layer_ons(int *save_array);
+
+/* Use this to restore them.  */
+void pcb_hid_restore_layer_ons(int *save_array);
+
 /* (un)init config watches and events to keep layers in sync */
 void pcb_layer_vis_init(void);
 void pcb_layer_vis_uninit(void);