cross: DimSlice: add dim/offset accessors

crates/cross/src/dim/dim_slice.rs

@@ -17,12 +17,12 @@ impl<T> DimSlice<T> {
     pub fn new(dim: Vec3u, items: T) -> Self {
         Self { dim, items }
     }
-    pub fn indices(&self) -> DimIter {
-        DimIter::new(self.dim)
-    }
     pub fn dim(&self) -> Vec3u {
         self.dim
     }
+    pub fn indices(&self) -> DimIter {
+        DimIter::new(self.dim)
+    }
 
     /// re-borrow the slice with a different lifetime.
     pub fn as_ref<R: ?Sized>(&self) -> DimSlice<&R>

crates/cross/src/dim/offset_dim_slice.rs

@@ -17,6 +17,12 @@ impl<T> OffsetDimSlice<T> {
     pub fn new(offset: Vec3u, dim: Vec3u, items: T) -> Self {
         Self { offset, inner: DimSlice::new(dim, items) }
     }
+    pub fn dim(&self) -> Vec3u {
+        self.inner.dim()
+    }
+    pub fn offset(&self) -> Vec3u {
+        self.offset
+    }
     pub fn indices(&self) -> OffsetDimIter {
         OffsetDimIter::new(self.offset, self.inner.indices())
     }