fix(autorouter/anterouter): Remove fanout if seg addition fails

src/autorouter/anterouter.rs

@@ -334,7 +334,7 @@ impl Anterouter {
         direction: impl Into<Point>,
         options: &AnterouterOptions,
     ) -> Result<(), ()> {
-        let (_, dots) = self.place_fanout_via_on_bbox_in_direction(
+        let (via, dots) = self.place_fanout_via_on_bbox_in_direction(
             autorouter,
             recorder,
             ratvertex,
@@ -363,7 +363,7 @@ impl Anterouter {
             })
             .unwrap();
 
-        autorouter.board.layout_mut().add_fixed_seg(
+        if let Ok(_) = autorouter.board.layout_mut().add_fixed_seg(
             &mut recorder.layout_edit,
             source_dot,
             fanout_dot,
@@ -372,9 +372,12 @@ impl Anterouter {
                 layer,
                 maybe_net,
             }),
-        );
-
+        ) {
             Ok(())
+        } else {
+            autorouter.board.remove_via(recorder, via, dots);
+            Err(())
+        }
     }
 
     fn place_fanout_via_on_bbox_in_direction(

src/board/mod.rs

@@ -125,6 +125,20 @@ impl<M: AccessMesadata> Board<M> {
         Ok((weight, dots))
     }
 
+    pub fn remove_via(
+        &mut self,
+        recorder: &mut BoardEdit,
+        via: GenericIndex<ViaWeight>,
+        dots: Vec<FixedDotIndex>,
+    ) {
+        for dot in dots.clone() {
+            self.pinname_nodes
+                .remove_by_value(&GenericNode::Primitive(dot.into()));
+        }
+
+        self.layout.remove_via(&mut recorder.layout_edit, via, dots);
+    }
+
     /// Adds a new fixed dot with an optional pin name.
     ///
     /// Inserts the dot into the layout and, if a pin name is provided, maps it to the created dot's node.

src/layout/layout.rs

@@ -157,6 +157,7 @@ impl<R: AccessRules> Layout<R> {
         weight: ViaWeight,
     ) -> Result<(GenericIndex<ViaWeight>, Vec<FixedDotIndex>), LayoutException> {
         let compound = self.drawing.add_compound(recorder, weight.into());
+        let via = GenericIndex::<ViaWeight>::new(compound.index());
         let mut dots = vec![];
 
         for layer in weight.from_layer..=weight.to_layer {
@@ -180,7 +181,7 @@ impl<R: AccessRules> Layout<R> {
                         // trigger an infringement on its primitives. To take
                         // this situation into account, we also check if the
                         // via's center is inside the poly's polygon.
-                        self.remove_failed_via(recorder, compound, dots);
+                        self.remove_via(recorder, via, dots);
                         return Err(LayoutException::HasPointInPoly(HasPointInPoly(
                             enclosing_poly.ref_(self).shape(),
                             weight.circle.pos,
@@ -195,7 +196,7 @@ impl<R: AccessRules> Layout<R> {
                     );
                 }
                 Err(err) => {
-                    self.remove_failed_via(recorder, compound, dots);
+                    self.remove_via(recorder, via, dots);
                     return Err(err.into());
                 }
             }
@@ -204,13 +205,14 @@ impl<R: AccessRules> Layout<R> {
         Ok((GenericIndex::<ViaWeight>::new(compound.index()), dots))
     }
 
-    fn remove_failed_via(
+    pub fn remove_via(
         &mut self,
         recorder: &mut LayoutEdit,
-        compound: GenericIndex<CompoundWeight>,
+        via: GenericIndex<ViaWeight>,
         dots: Vec<FixedDotIndex>,
     ) {
-        self.drawing.remove_compound(recorder, compound);
+        self.drawing
+            .remove_compound(recorder, GenericIndex::<CompoundWeight>::new(via.index()));
 
         // Remove inserted dots.
         for dot in dots.iter().rev() {

src/router/navmesh.rs

@@ -24,9 +24,10 @@ use crate::{
         bend::{FixedBendIndex, LooseBendIndex},
         dot::FixedDotIndex,
         gear::{GearIndex, GetOuterGears, WalkOutwards},
-        graph::PrimitiveIndex,
+        graph::{MakePrimitiveRef, PrimitiveIndex},
         rules::AccessRules,
     },
+    geometry::GetLayer,
     graph::{GenericIndex, GetIndex, MakeRef},
     layout::{CompoundEntryLabel, Layout},
     math::RotationSense,
@@ -157,6 +158,11 @@ impl Navmesh {
         destination: FixedDotIndex,
         options: RouterOptions,
     ) -> Result<Self, NavmeshError> {
+        assert!(
+            origin.primitive_ref(layout.drawing()).layer()
+                == destination.primitive_ref(layout.drawing()).layer()
+        );
+
         let mut graph: UnGraph<NavnodeWeight, (), usize> = UnGraph::default();
         let mut origin_navnode = None;
         let mut destination_navnode = None;