1 files changed, 26 insertions, 0 deletions
diff --git a/devtools/client/responsive.html/reducers/display-pixel-ratio.js b/devtools/client/responsive.html/reducers/display-pixel-ratio.js
new file mode 100644
index 000000000..3f127c206
--- /dev/null
+++ b/devtools/client/responsive.html/reducers/display-pixel-ratio.js
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env browser */
+
+"use strict";
+
+const { CHANGE_DISPLAY_PIXEL_RATIO } = require("../actions/index");
+const INITIAL_DISPLAY_PIXEL_RATIO = 0;
+
+let reducers = {
+
+  [CHANGE_DISPLAY_PIXEL_RATIO](_, action) {
+    return action.displayPixelRatio;
+  },
+
+};
+
+module.exports = function (displayPixelRatio = INITIAL_DISPLAY_PIXEL_RATIO, action) {
+  let reducer = reducers[action.type];
+  if (!reducer) {
+    return displayPixelRatio;
+  }
+  return reducer(displayPixelRatio, action);
+};