Add first control point if there's no subpath

components/canvas/canvas_data.rs

@@ -771,8 +771,8 @@ impl<'a> CanvasData<'a> {
     }
 
     pub fn quadratic_curve_to(&mut self, cp: &Point2D<f32>, endpoint: &Point2D<f32>) {
-        if self.path_builder().current_point().is_none() {
-            self.path_builder().move_to(cp);
+        if self.path_state.is_none() {
+            self.move_to(cp);
         }
         self.path_builder().quadratic_curve_to(cp, endpoint);
     }
@@ -783,6 +783,9 @@ impl<'a> CanvasData<'a> {
         cp2: &Point2D<f32>,
         endpoint: &Point2D<f32>,
     ) {
+        if self.path_state.is_none() {
+            self.move_to(cp1);
+        }
         self.path_builder().bezier_curve_to(cp1, cp2, endpoint);
     }