Index: obj_pstk.h
===================================================================
--- obj_pstk.h	(revision 12925)
+++ obj_pstk.h	(revision 12926)
@@ -137,6 +137,9 @@
 /* grow (or shrink) a prototype to or by val - change the proto in place */
 void pcb_pstk_proto_grow(pcb_pstk_proto_t *proto, pcb_bool is_absolute, pcb_coord_t val);
 
+/* Look up the shape index corresponding to a lty/comb; returns -1 if not found/empty */
+int pcb_pstk_get_shape_idx(pcb_pstk_tshape_t *ts, pcb_layer_type_t lyt, pcb_layer_combining_t comb);
+
 /* Remove a shape from the proto (either by layer or by idx) */
 void pcb_pstk_proto_del_shape(pcb_pstk_proto_t *proto, pcb_layer_type_t lyt, pcb_layer_combining_t comb);
 void pcb_pstk_proto_del_shape_idx(pcb_pstk_proto_t *proto, int idx);