bug: incorrect roundRect() with large radii

Fixes #2400

Author: zbjornson

CHANGELOG.md

@@ -10,6 +10,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 ### Added
 ### Fixed
+* `roundRect()` shape incorrect when radii were large relative to rectangle size (#2400)
 
 3.2.0
 ==================

src/CanvasRenderingContext2d.cc

@@ -3175,10 +3175,10 @@ Context2d::RoundRect(const Napi::CallbackInfo& info) {
       upperLeft.x *= scale;
       upperLeft.y *= scale;
       upperRight.x *= scale;
-      upperRight.x *= scale;
-      lowerLeft.y *= scale;
+      upperRight.y *= scale;
+      lowerLeft.x *= scale;
       lowerLeft.y *= scale;
-      lowerRight.y *= scale;
+      lowerRight.x *= scale;
       lowerRight.y *= scale;
     }
   }

test/public/tests.js

@@ -132,6 +132,11 @@ tests['roundRect()'] = function (ctx) {
   ctx.roundRect(135, 70, 60, 60, [{ x: 30, y: 10 }, { x: 5, y: 20 }])
   ctx.fillStyle = 'darkseagreen'
   ctx.fill()
+
+  ctx.beginPath()
+  ctx.roundRect(5, 135, 8, 60, 15)
+  ctx.fillStyle = 'purple'
+  ctx.fill()
 }
 
 tests['lineTo()'] = function (ctx) {