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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/gamepad/GamepadPlatformService.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=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 mozilla_dom_GamepadPlatformService_h_
+#define mozilla_dom_GamepadPlatformService_h_
+
+#include "mozilla/dom/GamepadBinding.h"
+
+#include "mozilla/Mutex.h"
+#include "mozilla/StaticPtr.h"
+
+namespace mozilla {
+namespace dom {
+
+class GamepadEventChannelParent;
+
+// Platform Service for building and transmitting IPDL messages
+// through the HAL sandbox. Used by platform specific
+// Gamepad implementations
+//
+// This class can be accessed by the following 2 threads :
+// 1. Background thread:
+// This thread takes charge of IPDL communications
+// between here and DOM side
+//
+// 2. Monitor Thread:
+// This thread is populated in platform-dependent backends, which
+// is in charge of processing gamepad hardware events from OS
+class GamepadPlatformService final
+{
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GamepadPlatformService)
+ public:
+ //Get the singleton service
+ static already_AddRefed<GamepadPlatformService> GetParentService();
+
+ // Add a gamepad to the list of known gamepads, and return its index.
+ uint32_t AddGamepad(const char* aID, GamepadMappingType aMapping,
+ uint32_t aNumButtons, uint32_t aNumAxes);
+ // Remove the gamepad at |aIndex| from the list of known gamepads.
+ void RemoveGamepad(uint32_t aIndex);
+
+ // Update the state of |aButton| for the gamepad at |aIndex| for all
+ // windows that are listening and visible, and fire one of
+ // a gamepadbutton{up,down} event at them as well.
+ // aPressed is used for digital buttons, aValue is for analog buttons.
+ void NewButtonEvent(uint32_t aIndex, uint32_t aButton, bool aPressed,
+ double aValue);
+ // When only a digital button is available the value will be synthesized.
+ void NewButtonEvent(uint32_t aIndex, uint32_t aButton, bool aPressed);
+
+ // Update the state of |aAxis| for the gamepad at |aIndex| for all
+ // windows that are listening and visible, and fire a gamepadaxismove
+ // event at them as well.
+ void NewAxisMoveEvent(uint32_t aIndex, uint32_t aAxis, double aValue);
+
+ // When shutting down the platform communications for gamepad, also reset the
+ // indexes.
+ void ResetGamepadIndexes();
+
+ //Add IPDL parent instance
+ void AddChannelParent(GamepadEventChannelParent* aParent);
+
+ //Remove IPDL parent instance
+ void RemoveChannelParent(GamepadEventChannelParent* aParent);
+
+ bool HasGamepadListeners();
+
+ void MaybeShutdown();
+
+ private:
+ GamepadPlatformService();
+ ~GamepadPlatformService();
+ template<class T> void NotifyGamepadChange(const T& aInfo);
+
+ // Flush all pending events buffered in mPendingEvents, must be called
+ // with mMutex held
+ void FlushPendingEvents();
+ void Cleanup();
+
+ // mGamepadIndex can only be accessed by monitor thread
+ uint32_t mGamepadIndex;
+
+ // mChannelParents stores all the GamepadEventChannelParent instances
+ // which may be accessed by both background thread and monitor thread
+ // simultaneously, so we have a mutex to prevent race condition
+ nsTArray<RefPtr<GamepadEventChannelParent>> mChannelParents;
+
+ // This mutex protects mChannelParents from race condition
+ // between background and monitor thread
+ Mutex mMutex;
+
+ // In mochitest, it is possible that the test Events is synthesized
+ // before GamepadEventChannel created, we need to buffer all events
+ // until the channel is created if that happens.
+ nsTArray<GamepadChangeEvent> mPendingEvents;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif