Index: polygon.h
===================================================================
--- polygon.h	(revision 16963)
+++ polygon.h	(revision 16964)
@@ -89,6 +89,10 @@
 void pcb_poly_restore_to_poly(pcb_data_t *, int, void *, void *);
 void pcb_poly_clear_from_poly(pcb_data_t *, int, void *, void *);
 
+/* Same as pcb_poly_init_clip() but also call cb before each operation,
+   giving the caller a chance to draw a progress bar */
+int pcb_poly_init_clip_prog(pcb_data_t *Data, pcb_layer_t *layer, pcb_poly_t *p, void (*cb)(void *ctx), void *ctx);
+
 pcb_bool pcb_poly_is_point_in_p(pcb_coord_t, pcb_coord_t, pcb_coord_t, pcb_poly_t *);
 pcb_bool pcb_poly_is_point_in_p_ignore_holes(pcb_coord_t, pcb_coord_t, pcb_poly_t *);
 pcb_bool_t pcb_is_point_in_convex_quad(pcb_vector_t p, pcb_vector_t *q);