Ensure there's a subpath for the first control point

servo · Jan 6, 2020 · f691acd · f691acd
1 parent 0d142be
commit f691acd
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Showing 3 changed files with 4 additions and 9 deletions.
diff --git a/components/canvas/canvas_data.rs b/components/canvas/canvas_data.rs
@@ -798,7 +798,10 @@ impl<'a> CanvasData<'a> {
     pub fn arc_to(&mut self, cp1: &Point2D<f32>, cp2: &Point2D<f32>, radius: f32) {
         let cp0 = match self.path_builder().current_point() {
             Some(p) => p,
-            None => return,
+            None => {
+                self.path_builder().move_to(cp1);
+                cp1.clone()
+            },
         };
         let cp1 = *cp1;
         let cp2 = *cp2;

diff --git a/tests/wpt/metadata/2dcontext/path-objects/2d.path.arcTo.ensuresubpath.2.html.ini b/tests/wpt/metadata/2dcontext/path-objects/2d.path.arcTo.ensuresubpath.2.html.ini
diff --git a/tests/wpt/metadata/offscreen-canvas/path-objects/2d.path.arcTo.ensuresubpath.2.html.ini b/tests/wpt/metadata/offscreen-canvas/path-objects/2d.path.arcTo.ensuresubpath.2.html.ini