Index: trunk/src/obj_poly.c
===================================================================
--- trunk/src/obj_poly.c	(revision 14719)
+++ trunk/src/obj_poly.c	(revision 14720)
@@ -198,6 +198,30 @@
 	PCB_END_LOOP;
 }
 
+#if 0
+int pcb_poly_eq(const pcb_element_t *e1, const pcb_line_t *l1, const pcb_element_t *e2, const pcb_line_t *l2)
+{
+	if (pcb_field_neq(l1, l2, Thickness) || pcb_field_neq(l1, l2, Clearance)) return 0;
+	if (pcb_element_neq_offsx(e1, l1, e2, l2, Point1.X) || pcb_element_neq_offsy(e1, l1, e2, l2, Point1.Y)) return 0;
+	if (pcb_element_neq_offsx(e1, l1, e2, l2, Point2.X) || pcb_element_neq_offsy(e1, l1, e2, l2, Point2.Y)) return 0;
+	if (pcb_neqs(l1->Number, l2->Number)) return 0;
+	return 1;
+}
+#endif
+
+unsigned int pcb_subc_poly_hash(pcb_coord_t ox, pcb_coord_t oy, const pcb_poly_t *p)
+{
+	unsigned int crd = 0;
+	pcb_cardinal_t n;
+
+	if (!PCB_FLAG_TEST(PCB_FLAG_FLOATER, p))
+		for(n = 0; n < p->PointN; n++)
+			crd ^= pcb_hash_coord(p->Points[n].X-ox) ^ pcb_hash_coord(p->Points[n].Y-oy);
+
+	return pcb_hash_coord(p->Clearance) ^ pcb_hash_str(p->term) ^ crd;
+}
+
+
 /* creates a new polygon from the old formats rectangle data */
 pcb_poly_t *pcb_poly_new_from_rectangle(pcb_layer_t *Layer, pcb_coord_t X1, pcb_coord_t Y1, pcb_coord_t X2, pcb_coord_t Y2, pcb_coord_t Clearance, pcb_flag_t Flags)
 {
Index: trunk/src/obj_poly.h
===================================================================
--- trunk/src/obj_poly.h	(revision 14719)
+++ trunk/src/obj_poly.h	(revision 14720)
@@ -76,6 +76,9 @@
 void pcb_poly_move(pcb_poly_t *Polygon, pcb_coord_t DX, pcb_coord_t DY);
 pcb_poly_t *pcb_poly_copy(pcb_poly_t *Dest, pcb_poly_t *Src, pcb_coord_t dx, pcb_coord_t dy);
 
+/* hash */
+unsigned int pcb_subc_poly_hash(pcb_coord_t ox, pcb_coord_t oy, const pcb_poly_t *p);
+
 /* Add objects without creating them or making any "sanity modifications" to them */
 void pcb_add_poly_on_layer(pcb_layer_t *Layer, pcb_poly_t *polygon);
 
Index: trunk/src/obj_text.c
===================================================================
--- trunk/src/obj_text.c	(revision 14719)
+++ trunk/src/obj_text.c	(revision 14720)
@@ -332,8 +332,27 @@
 	pcb_text_free_str(Text, rendered);
 }
 
+#if 0
+int pcb_text_eq(const pcb_element_t *e1, const pcb_line_t *l1, const pcb_element_t *e2, const pcb_line_t *l2)
+{
+	if (pcb_field_neq(l1, l2, Thickness) || pcb_field_neq(l1, l2, Clearance)) return 0;
+	if (pcb_element_neq_offsx(e1, l1, e2, l2, Point1.X) || pcb_element_neq_offsy(e1, l1, e2, l2, Point1.Y)) return 0;
+	if (pcb_element_neq_offsx(e1, l1, e2, l2, Point2.X) || pcb_element_neq_offsy(e1, l1, e2, l2, Point2.Y)) return 0;
+	if (pcb_neqs(l1->Number, l2->Number)) return 0;
+	return 1;
+}
+#endif
 
+unsigned int pcb_subc_text_hash(pcb_coord_t ox, pcb_coord_t oy, const pcb_text_t *t)
+{
+	unsigned int crd = 0;
+	if (!PCB_FLAG_TEST(PCB_FLAG_FLOATER, t))
+		crd = pcb_hash_coord(t->X-ox) ^ pcb_hash_coord(t->Y-oy) ^ pcb_hash_coord(t->Scale);
 
+	return pcb_hash_str(t->TextString) ^ pcb_hash_str(t->term) ^ crd;
+}
+
+
 /*** ops ***/
 /* copies a text to buffer */
 void *pcb_textop_add_to_buffer(pcb_opctx_t *ctx, pcb_layer_t *Layer, pcb_text_t *Text)
Index: trunk/src/obj_text.h
===================================================================
--- trunk/src/obj_text.h	(revision 14719)
+++ trunk/src/obj_text.h	(revision 14720)
@@ -72,6 +72,9 @@
    directly under data - useful e.g. on parent attr change */
 void pcb_text_dyn_bbox_update(pcb_data_t *data);
 
+/* hash */
+unsigned int pcb_subc_text_hash(pcb_coord_t ox, pcb_coord_t oy, const pcb_text_t *t);
+
 /* Append dyntext fmt rendered from the perspective of obj */
 int pcb_append_dyntext(gds_t *dst, pcb_any_obj_t *obj, const char *fmt);