Small fixes

src/library/image.rs

@@ -77,7 +77,7 @@ impl Layout for ImageNode {
         let mut frame = Frame::new(canvas, canvas.h);
         frame.clips = self.fit == ImageFit::Cover;
         frame.push(
-            Point::new((canvas.w - size.w) / 2.0, (canvas.h - size.h) / 2.0),
+            (canvas - size).to_point() / 2.0,
             Element::Image(self.id, size),
         );
 

src/library/page.rs

@@ -106,7 +106,7 @@ impl PageNode {
         if let Some(fill) = self.fill {
             for frame in &mut frames {
                 let element = Element::Geometry(Geometry::Rect(frame.size), fill);
-                Rc::make_mut(frame).prepend(Point::zero(), element)
+                Rc::make_mut(frame).prepend(Point::zero(), element);
             }
         }
 

src/library/par.rs

@@ -644,6 +644,7 @@ impl<'a> LineStack<'a> {
         self.regions.next();
         self.full = self.regions.current;
         self.cts = Constraints::new(self.regions.expand);
+        self.cts.base = self.regions.base.to_spec().map(Some);
         self.size = Size::zero();
     }
 

tests/typeset.rs

@@ -437,8 +437,13 @@ fn draw_frame(
         let h = frame.size.h.to_pt() as f32;
         let rect = sk::Rect::from_xywh(0.0, 0.0, w, h).unwrap();
         let path = sk::PathBuilder::from_rect(rect).transform(ts).unwrap();
+        let rule = sk::FillRule::default();
         storage = mask.clone();
-        storage.intersect_path(&path, sk::FillRule::default(), false);
+        if storage.intersect_path(&path, rule, false).is_none() {
+            // Fails if clipping rect is empty. In that case we just clip everything
+            // by returning.
+            return;
+        }
         &storage
     } else {
         mask