Add deprecated comment to scaleFactor parameter

atom/common/api/atom_api_native_image.cc

@@ -410,13 +410,14 @@ mate::Handle<NativeImage> NativeImage::CreateFromBuffer(
   int height = 0;
   double scale_factor = 1.;
 
-  args->GetNext(&scale_factor);
-
   mate::Dictionary options;
   if (args->GetNext(&options)) {
     options.Get("width", &width);
     options.Get("height", &height);
     options.Get("scaleFactor", &scale_factor);
+  } else {
+    // TODO(kevinsawicki): Remove in 2.0, deprecate before then with warnings
+    args->GetNext(&scale_factor);
   }
 
   gfx::ImageSkia image_skia;

spec/api-native-image-spec.js

@@ -44,6 +44,13 @@ describe('nativeImage module', () => {
       const imageH = nativeImage.createFromBuffer(imageA.toJPEG(100),
         {width: 100, height: 200})
       assert.deepEqual(imageH.getSize(), {width: 538, height: 190})
+
+      const imageI = nativeImage.createFromBuffer(imageA.toBitmap(),
+        {width: 538, height: 190, scaleFactor: 2.0})
+      assert.deepEqual(imageI.getSize(), {width: 269, height: 95})
+
+      const imageJ = nativeImage.createFromBuffer(imageA.toPNG(), 2.0)
+      assert.deepEqual(imageJ.getSize(), {width: 269, height: 95})
     })
   })