Index: trunk/src/obj_pstk.h
===================================================================
--- trunk/src/obj_pstk.h	(revision 19788)
+++ trunk/src/obj_pstk.h	(revision 19789)
@@ -143,6 +143,10 @@
 /* free fields of a proto (not freeing the proto itself, not removing it from lists */
 void pcb_pstk_proto_free_fields(pcb_pstk_proto_t *dst);
 
+/* low level: allocate a new, uninitialized shape at the end of a transformed shape
+   WARNING: this should be done on all transformed shapes in parallel! */
+pcb_pstk_shape_t *pcb_pstk_alloc_append_shape(pcb_pstk_tshape_t *ts);
+
 /* allocate/free the point array of a poly shape (single allocation for x and y) */
 void pcb_pstk_shape_alloc_poly(pcb_pstk_poly_t *poly, int len);
 void pcb_pstk_shape_free_poly(pcb_pstk_poly_t *poly);
Index: trunk/src/obj_pstk_proto.c
===================================================================
--- trunk/src/obj_pstk_proto.c	(revision 19788)
+++ trunk/src/obj_pstk_proto.c	(revision 19789)
@@ -98,6 +98,16 @@
 	return -1;
 }
 
+pcb_pstk_shape_t *pcb_pstk_alloc_append_shape(pcb_pstk_tshape_t *ts)
+{
+	int idx = ts->len;
+
+	ts->len++;
+	ts->shape = realloc(ts->shape, ts->len * sizeof(pcb_pstk_shape_t));
+
+	return &ts->shape[idx];
+}
+
 static void append_circle(pcb_pstk_tshape_t *ts, pcb_layer_type_t lyt, pcb_layer_combining_t comb, pcb_coord_t dia)
 {
 	int idx = ts->len;