1 files changed, 48 insertions, 0 deletions
diff --git a/widget/cocoa/nsCocoaFeatures.h b/widget/cocoa/nsCocoaFeatures.h
new file mode 100644
index 0000000000..0b157648cc
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+++ b/widget/cocoa/nsCocoaFeatures.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsCocoaFeatures_h_
+#define nsCocoaFeatures_h_
+
+#include <stdint.h>
+
+/// Note that this class assumes we support the platform we are running on.
+/// For better or worse, if the version is unknown or less than what we
+/// support, we set it to the minimum supported version. GetSystemVersion
+/// is the only call that returns the unadjusted values.
+class nsCocoaFeatures {
+ public:
+  static int32_t macOSVersion();
+  static int32_t macOSVersionMajor();
+  static int32_t macOSVersionMinor();
+  static int32_t macOSVersionBugFix();
+  static bool OnBigSurOrLater();
+  static bool OnMontereyOrLater();
+  static bool OnVenturaOrLater();
+
+  static bool IsAtLeastVersion(int32_t aMajor, int32_t aMinor,
+                               int32_t aBugFix = 0);
+
+  static bool ProcessIsRosettaTranslated();
+
+  // These are utilities that do not change or depend on the value of
+  // mOSVersion and instead just encapsulate the encoding algorithm. Note that
+  // GetVersion actually adjusts to the lowest supported OS, so it will always
+  // return a "supported" version. GetSystemVersion does not make any
+  // modifications.
+  static void GetSystemVersion(int& aMajor, int& aMinor, int& aBugFix);
+  static int32_t GetVersion(int32_t aMajor, int32_t aMinor, int32_t aBugFix);
+  static int32_t ExtractMajorVersion(int32_t aVersion);
+  static int32_t ExtractMinorVersion(int32_t aVersion);
+  static int32_t ExtractBugFixVersion(int32_t aVersion);
+
+ private:
+  nsCocoaFeatures() = delete;  // Prevent instantiation.
+  static void InitializeVersionNumbers();
+
+  static int32_t mOSVersion;
+};
+
+#endif  // nsCocoaFeatures_h_