style: rustfmt

crates/metafile/src/place.rs

@@ -136,8 +136,14 @@ impl Picture {
             match item {
                 Item::Path { segs, fill, stroke, even_odd } => {
                     let path = tf * bez(segs);
-                    if in_range(path.bounding_box()) {
-                        let stroke = stroke.map(|(c, w)| (c, f64::from(w) * k));
+                    let bounds = path.bounding_box();
+                    if in_range(bounds) {
+                        // A pen wider than twice the distance across the frame and the path
+                        // already covers the whole frame: wider adds nothing the frame shows, only
+                        // work for the renderer flattening its round caps (the width is file data).
+                        let u = bounds.union(r);
+                        let widest = 2.0 * u.width().hypot(u.height());
+                        let stroke = stroke.map(|(c, w)| (c, (f64::from(w) * k).min(widest)));
                         out.push(PlacedItem::Path { path, fill: *fill, stroke, even_odd: *even_odd });
                     }
                 }

crates/metafile/src/tests.rs

@@ -891,6 +891,34 @@ fn place_fits_the_frame_scales_strokes_and_drops_far_paths() {
     assert_eq!(stroke.map(|s| s.1), Some(8.0));
 }
 
+#[test]
+fn a_huge_pen_is_held_to_what_covers_the_frame() {
+    // A pen of 1e30 units on a short path: round caps that wide took the renderer forever to
+    // flatten. Past twice the distance across the frame and the path it covers no more.
+    let path = |w: f32| crate::Picture {
+        width: 100.0,
+        height: 50.0,
+        items: vec![Item::Path {
+            segs: vec![Seg::Move(0.0, 0.0), Seg::Line(10.0, 0.0)],
+            fill: None,
+            stroke: Some(([0, 0, 0, 255], w)),
+            even_odd: true,
+        }],
+    };
+    let width = |w: f32| match pic_place(&path(w)).first() {
+        Some(crate::PlacedItem::Path { stroke, .. }) => stroke.map(|s| s.1),
+        _ => None,
+    };
+    let cap = 2.0 * 200f64.hypot(100.0);
+    assert_eq!(width(1e30), Some(cap));
+    assert_eq!(width(f32::MAX), Some(cap));
+    assert_eq!(width(4.0), Some(8.0), "an ordinary pen is untouched");
+}
+
+fn pic_place(pic: &crate::Picture) -> Vec<crate::PlacedItem> {
+    pic.place(kurbo::Rect::new(0.0, 0.0, 200.0, 100.0), [0.0; 4])
+}
+
 /// #1899: a crop keeps what the file says down to a sliver (a header's bar is 2.7% of a page-sized
 /// metafile), and junk sides give a finite part of the source with some area.
 #[test]