1 files changed, 128 insertions, 0 deletions
diff --git a/accessible/windows/msaa/Compatibility.h b/accessible/windows/msaa/Compatibility.h
new file mode 100644
index 0000000000..6e57fa5bec
--- /dev/null
+++ b/accessible/windows/msaa/Compatibility.h
@@ -0,0 +1,128 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 COMPATIBILITY_MANAGER_H
+#define COMPATIBILITY_MANAGER_H
+
+#include "mozilla/Maybe.h"
+#include "nsString.h"
+#include <stdint.h>
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Used to get compatibility modes. Note, modes are computed at accessibility
+ * start up time and aren't changed during lifetime.
+ */
+class Compatibility {
+ public:
+  /**
+   * Return true if JAWS mode is enabled.
+   */
+  static bool IsJAWS() { return !!(sConsumers & (JAWS | OLDJAWS)); }
+
+  /**
+   * Return true if using an e10s incompatible Jaws.
+   */
+  static bool IsOldJAWS() { return !!(sConsumers & OLDJAWS); }
+
+  /**
+   * Return true if WE mode is enabled.
+   */
+  static bool IsWE() { return !!(sConsumers & WE); }
+
+  /**
+   * Return true if Dolphin mode is enabled.
+   */
+  static bool IsDolphin() { return !!(sConsumers & DOLPHIN); }
+
+  /**
+   * Return true if JAWS, ZoomText or ZoomText Fusion 2021 or later is being
+   * used. These products share common code for interacting with Firefox and
+   * all require window emulation to be enabled.
+   */
+  static bool IsVisperoShared() { return !!(sConsumers & VISPEROSHARED); }
+
+  /**
+   * @return ID of a11y manifest resource to be passed to
+   * mscom::ActivationContext
+   */
+  static uint16_t GetActCtxResourceId();
+
+  /**
+   * Return a string describing sConsumers suitable for about:support.
+   * Exposed through nsIXULRuntime.accessibilityInstantiator.
+   */
+  static void GetHumanReadableConsumersStr(nsAString& aResult);
+
+  /**
+   * Initialize compatibility mode information.
+   */
+  static void Init();
+
+  static Maybe<bool> OnUIAMessage(WPARAM aWParam, LPARAM aLParam);
+
+  static Maybe<DWORD> GetUiaRemotePid() { return sUiaRemotePid; }
+
+  /**
+   * return true if a known, non-UIA a11y consumer is present
+   */
+  static bool HasKnownNonUiaConsumer();
+
+  /**
+   * Return true if a module's version is lesser than the given version.
+   * Generally, the version should be provided using the MAKE_FILE_VERSION
+   * macro.
+   * If the version information cannot be retrieved, true is returned; i.e.
+   * no version information implies an earlier version.
+   */
+  static bool IsModuleVersionLessThan(HMODULE aModuleHandle,
+                                      unsigned long long aVersion);
+
+ private:
+  Compatibility();
+  Compatibility(const Compatibility&);
+  Compatibility& operator=(const Compatibility&);
+
+  static void InitConsumers();
+
+  /**
+   * List of detected consumers of a11y (used for statistics/telemetry and
+   * compat)
+   */
+  enum {
+    NVDA = 1 << 0,
+    JAWS = 1 << 1,
+    OLDJAWS = 1 << 2,
+    WE = 1 << 3,
+    DOLPHIN = 1 << 4,
+    SEROTEK = 1 << 5,
+    COBRA = 1 << 6,
+    ZOOMTEXT = 1 << 7,
+    KAZAGURU = 1 << 8,
+    YOUDAO = 1 << 9,
+    UNKNOWN = 1 << 10,
+    UIAUTOMATION = 1 << 11,
+    VISPEROSHARED = 1 << 12
+  };
+#define CONSUMERS_ENUM_LEN 13
+
+ private:
+  static uint32_t sConsumers;
+  static Maybe<DWORD> sUiaRemotePid;
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+// Convert the 4 (decimal) components of a DLL version number into a
+// single unsigned long long, as needed by
+// mozilla::a11y::Compatibility::IsModuleVersionLessThan.
+#define MAKE_FILE_VERSION(a, b, c, d) \
+  ((a##ULL << 48) + (b##ULL << 32) + (c##ULL << 16) + d##ULL)
+
+#endif