1 files changed, 41 insertions, 0 deletions
diff --git a/widget/nsBaseScreen.h b/widget/nsBaseScreen.h
new file mode 100644
index 0000000000..3158894754
--- /dev/null
+++ b/widget/nsBaseScreen.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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/. */
+
+#ifndef nsBaseScreen_h
+#define nsBaseScreen_h
+
+#include "mozilla/Attributes.h"
+#include "nsIScreen.h"
+
+class nsBaseScreen : public nsIScreen {
+ public:
+  nsBaseScreen();
+
+  NS_DECL_ISUPPORTS
+
+  // nsIScreen interface
+
+  // These simply forward to the device-pixel versions;
+  // implementations where desktop pixels may not correspond
+  // to per-screen device pixels must override.
+  NS_IMETHOD GetRectDisplayPix(int32_t* outLeft, int32_t* outTop,
+                               int32_t* outWidth, int32_t* outHeight) override;
+  NS_IMETHOD GetAvailRectDisplayPix(int32_t* outLeft, int32_t* outTop,
+                                    int32_t* outWidth,
+                                    int32_t* outHeight) override;
+
+  NS_IMETHOD GetContentsScaleFactor(double* aContentsScaleFactor) override;
+
+  NS_IMETHOD GetDefaultCSSScaleFactor(double* aScaleFactor) override;
+
+  NS_IMETHOD GetDpi(float* aDPI) override;
+
+ protected:
+  virtual ~nsBaseScreen();
+};
+
+#endif  // nsBaseScreen_h