services/surfaceflinger/DisplayHardware/HWComposer.h - platform/frameworks/native - Gitiles

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ANDROID_SF_HWCOMPOSER_H
 #define ANDROID_SF_HWCOMPOSER_H

 #include <stdint.h>
 #include <sys/types.h>

 #include <hardware/hwcomposer_defs.h>

 #include <ui/Fence.h>

 #include <utils/BitSet.h>
 #include <utils/Condition.h>
 #include <utils/Mutex.h>
 #include <utils/StrongPointer.h>
 #include <utils/Thread.h>
 #include <utils/Timers.h>
 #include <utils/Vector.h>

 extern "C" int clock_nanosleep(clockid_t clock_id, int flags,
                            const struct timespec *request,
                            struct timespec *remain);

 struct hwc_composer_device_1;
 struct hwc_display_contents_1;
 struct hwc_layer_1;
 struct hwc_procs;
 struct framebuffer_device_t;

 namespace android {
 // ---------------------------------------------------------------------------

 class Fence;
 class FloatRect;
 class GraphicBuffer;
 class NativeHandle;
 class Region;
 class String8;
 class SurfaceFlinger;

 class HWComposer
 {
 public:
     class EventHandler {
         friend class HWComposer;
         virtual void onVSyncReceived(int disp, nsecs_t timestamp) = 0;
         virtual void onHotplugReceived(int disp, bool connected) = 0;
     protected:
         virtual ~EventHandler() {}
     };

     enum {
         NUM_BUILTIN_DISPLAYS = HWC_NUM_PHYSICAL_DISPLAY_TYPES,
         MAX_HWC_DISPLAYS = HWC_NUM_DISPLAY_TYPES,
         VIRTUAL_DISPLAY_ID_BASE = HWC_DISPLAY_VIRTUAL,
     };

     HWComposer(
             const sp<SurfaceFlinger>& flinger,
             EventHandler& handler);

     ~HWComposer();

     status_t initCheck() const;

     // Returns a display ID starting at VIRTUAL_DISPLAY_ID_BASE, this ID is to
     // be used with createWorkList (and all other methods requiring an ID
     // below).
     // IDs below NUM_BUILTIN_DISPLAYS are pre-defined and therefore are
     // always valid.
     // Returns -1 if an ID cannot be allocated
     int32_t allocateDisplayId();

     // Recycles the given virtual display ID and frees the associated worklist.
     // IDs below NUM_BUILTIN_DISPLAYS are not recycled.
     status_t freeDisplayId(int32_t id);


     // Asks the HAL what it can do
     status_t prepare();

     // commits the list
     status_t commit();

     // set power mode
     status_t setPowerMode(int disp, int mode);

     // set active config
     status_t setActiveConfig(int disp, int mode);

     // reset state when an external, non-virtual display is disconnected
     void disconnectDisplay(int disp);

     // create a work list for numLayers layer. sets HWC_GEOMETRY_CHANGED.
     status_t createWorkList(int32_t id, size_t numLayers);

     bool supportsFramebufferTarget() const;

     // does this display have layers handled by HWC
     bool hasHwcComposition(int32_t id) const;

     // does this display have layers handled by GLES
     bool hasGlesComposition(int32_t id) const;

     // get the releaseFence file descriptor for a display's framebuffer layer.
     // the release fence is only valid after commit()
     sp<Fence> getAndResetReleaseFence(int32_t id);

     // needed forward declarations
     class LayerListIterator;

     // return the visual id to be used to find a suitable EGLConfig for
     // *ALL* displays.
     int getVisualID() const;

     // Forwarding to FB HAL for pre-HWC-1.1 code (see FramebufferSurface).
     int fbPost(int32_t id, const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf);
     int fbCompositionComplete();
     void fbDump(String8& result);

     // Set the output buffer and acquire fence for a virtual display.
     // Returns INVALID_OPERATION if id is not a virtual display.
     status_t setOutputBuffer(int32_t id, const sp<Fence>& acquireFence,
             const sp<GraphicBuffer>& buf);

     // Get the retire fence for the last committed frame. This fence will
     // signal when the h/w composer is completely finished with the frame.
     // For physical displays, it is no longer being displayed. For virtual
     // displays, writes to the output buffer are complete.
     sp<Fence> getLastRetireFence(int32_t id) const;

     status_t setCursorPositionAsync(int32_t id, const Rect &pos);

     /*
      * Interface to hardware composer's layers functionality.
      * This abstracts the HAL interface to layers which can evolve in
      * incompatible ways from one release to another.
      * The idea is that we could extend this interface as we add
      * features to h/w composer.
      */
     class HWCLayerInterface {
     protected:
         virtual ~HWCLayerInterface() { }
     public:
         virtual int32_t getCompositionType() const = 0;
         virtual uint32_t getHints() const = 0;
         virtual sp<Fence> getAndResetReleaseFence() = 0;
         virtual void setDefaultState() = 0;
         virtual void setSkip(bool skip) = 0;
         virtual void setIsCursorLayerHint(bool isCursor = true) = 0;
         virtual void setBlending(uint32_t blending) = 0;
         virtual void setTransform(uint32_t transform) = 0;
         virtual void setFrame(const Rect& frame) = 0;
         virtual void setCrop(const FloatRect& crop) = 0;
         virtual void setVisibleRegionScreen(const Region& reg) = 0;
         virtual void setSurfaceDamage(const Region& reg) = 0;
         virtual void setSidebandStream(const sp<NativeHandle>& stream) = 0;
         virtual void setBuffer(const sp<GraphicBuffer>& buffer) = 0;
         virtual void setAcquireFenceFd(int fenceFd) = 0;
         virtual void setPlaneAlpha(uint8_t alpha) = 0;
         virtual void onDisplayed() = 0;
     };

     /*
      * Interface used to implement an iterator to a list
      * of HWCLayer.
      */
     class HWCLayer : public HWCLayerInterface {
         friend class LayerListIterator;
         // select the layer at the given index
         virtual status_t setLayer(size_t index) = 0;
         virtual HWCLayer* dup() = 0;
         static HWCLayer* copy(HWCLayer *rhs) {
             return rhs ? rhs->dup() : NULL;
         }
     protected:
         virtual ~HWCLayer() { }
     };

     /*
      * Iterator through a HWCLayer list.
      * This behaves more or less like a forward iterator.
      */
     class LayerListIterator {
         friend class HWComposer;
         HWCLayer* const mLayerList;
         size_t mIndex;

         LayerListIterator() : mLayerList(NULL), mIndex(0) { }

         LayerListIterator(HWCLayer* layer, size_t index)
             : mLayerList(layer), mIndex(index) { }

         // we don't allow assignment, because we don't need it for now
         LayerListIterator& operator = (const LayerListIterator& rhs);

     public:
         // copy operators
         LayerListIterator(const LayerListIterator& rhs)
             : mLayerList(HWCLayer::copy(rhs.mLayerList)), mIndex(rhs.mIndex) {
         }

         ~LayerListIterator() { delete mLayerList; }

         // pre-increment
         LayerListIterator& operator++() {
             mLayerList->setLayer(++mIndex);
             return *this;
         }

         // dereference
         HWCLayerInterface& operator * () { return *mLayerList; }
         HWCLayerInterface* operator -> () { return mLayerList; }

         // comparison
         bool operator == (const LayerListIterator& rhs) const {
             return mIndex == rhs.mIndex;
         }
         bool operator != (const LayerListIterator& rhs) const {
             return !operator==(rhs);
         }
     };

     // Returns an iterator to the beginning of the layer list
     LayerListIterator begin(int32_t id);

     // Returns an iterator to the end of the layer list
     LayerListIterator end(int32_t id);


     // Events handling ---------------------------------------------------------

     enum {
         EVENT_VSYNC = HWC_EVENT_VSYNC
     };

     void eventControl(int disp, int event, int enabled);

     struct DisplayConfig {
         uint32_t width;
         uint32_t height;
         float xdpi;
         float ydpi;
         nsecs_t refresh;
     };

     // Query display parameters.  Pass in a display index (e.g.
     // HWC_DISPLAY_PRIMARY).
     nsecs_t getRefreshTimestamp(int disp) const;
     sp<Fence> getDisplayFence(int disp) const;
     uint32_t getFormat(int disp) const;
     bool isConnected(int disp) const;

     // These return the values for the current config of a given display index.
     // To get the values for all configs, use getConfigs below.
     uint32_t getWidth(int disp) const;
     uint32_t getHeight(int disp) const;
     float getDpiX(int disp) const;
     float getDpiY(int disp) const;
     nsecs_t getRefreshPeriod(int disp) const;

     const Vector<DisplayConfig>& getConfigs(int disp) const;
     size_t getCurrentConfig(int disp) const;

     status_t setVirtualDisplayProperties(int32_t id, uint32_t w, uint32_t h,
             uint32_t format);

     // this class is only used to fake the VSync event on systems that don't
     // have it.
     class VSyncThread : public Thread {
         HWComposer& mHwc;
         mutable Mutex mLock;
         Condition mCondition;
         bool mEnabled;
         mutable nsecs_t mNextFakeVSync;
         nsecs_t mRefreshPeriod;
         virtual void onFirstRef();
         virtual bool threadLoop();
     public:
         VSyncThread(HWComposer& hwc);
         void setEnabled(bool enabled);
     };

     friend class VSyncThread;

     // for debugging ----------------------------------------------------------
     void dump(String8& out) const;

 private:
     void loadHwcModule();
     int loadFbHalModule();

     LayerListIterator getLayerIterator(int32_t id, size_t index);

     struct cb_context;

     static void hook_invalidate(const struct hwc_procs* procs);
     static void hook_vsync(const struct hwc_procs* procs, int disp,
             int64_t timestamp);
     static void hook_hotplug(const struct hwc_procs* procs, int disp,
             int connected);

     inline void invalidate();
     inline void vsync(int disp, int64_t timestamp);
     inline void hotplug(int disp, int connected);

     status_t queryDisplayProperties(int disp);

     status_t setFramebufferTarget(int32_t id,
             const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf);

     struct DisplayData {
         DisplayData();
         ~DisplayData();
         Vector<DisplayConfig> configs;
         size_t currentConfig;
         uint32_t format;    // pixel format from FB hal, for pre-hwc-1.1
         bool connected;
         bool hasFbComp;
         bool hasOvComp;
         size_t capacity;
         hwc_display_contents_1* list;
         hwc_layer_1* framebufferTarget;
         buffer_handle_t fbTargetHandle;
         sp<Fence> lastRetireFence;  // signals when the last set op retires
         sp<Fence> lastDisplayFence; // signals when the last set op takes
                                     // effect on screen
         buffer_handle_t outbufHandle;
         sp<Fence> outbufAcquireFence;

         // protected by mEventControlLock
         int32_t events;
     };

     sp<SurfaceFlinger>              mFlinger;
     framebuffer_device_t*           mFbDev;
     struct hwc_composer_device_1*   mHwc;
     // invariant: mLists[0] != NULL iff mHwc != NULL
     // mLists[i>0] can be NULL. that display is to be ignored
     struct hwc_display_contents_1*  mLists[MAX_HWC_DISPLAYS];
     DisplayData                     mDisplayData[MAX_HWC_DISPLAYS];
     // protect mDisplayData from races between prepare and dump
     mutable Mutex mDisplayLock;
     size_t                          mNumDisplays;

     cb_context*                     mCBContext;
     EventHandler&                   mEventHandler;
     size_t                          mVSyncCounts[HWC_NUM_PHYSICAL_DISPLAY_TYPES];
     sp<VSyncThread>                 mVSyncThread;
     bool                            mDebugForceFakeVSync;
     BitSet32                        mAllocatedDisplayIDs;

     // protected by mLock
     mutable Mutex mLock;
     mutable nsecs_t mLastHwVSync[HWC_NUM_PHYSICAL_DISPLAY_TYPES];

     // thread-safe
     mutable Mutex mEventControlLock;
 };

 // ---------------------------------------------------------------------------
 }; // namespace android

 #endif // ANDROID_SF_HWCOMPOSER_H
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ANDROID_SF_HWCOMPOSER_H
	#define ANDROID_SF_HWCOMPOSER_H

	#include <stdint.h>
	#include <sys/types.h>

	#include <hardware/hwcomposer_defs.h>

	#include <ui/Fence.h>

	#include <utils/BitSet.h>
	#include <utils/Condition.h>
	#include <utils/Mutex.h>
	#include <utils/StrongPointer.h>
	#include <utils/Thread.h>
	#include <utils/Timers.h>
	#include <utils/Vector.h>

	extern "C" int clock_nanosleep(clockid_t clock_id, int flags,
	const struct timespec *request,
	struct timespec *remain);

	struct hwc_composer_device_1;
	struct hwc_display_contents_1;
	struct hwc_layer_1;
	struct hwc_procs;
	struct framebuffer_device_t;

	namespace android {
	// ---------------------------------------------------------------------------

	class Fence;
	class FloatRect;
	class GraphicBuffer;
	class NativeHandle;
	class Region;
	class String8;
	class SurfaceFlinger;

	class HWComposer
	{
	public:
	class EventHandler {
	friend class HWComposer;
	virtual void onVSyncReceived(int disp, nsecs_t timestamp) = 0;
	virtual void onHotplugReceived(int disp, bool connected) = 0;
	protected:
	virtual ~EventHandler() {}
	};

	enum {
	NUM_BUILTIN_DISPLAYS = HWC_NUM_PHYSICAL_DISPLAY_TYPES,
	MAX_HWC_DISPLAYS = HWC_NUM_DISPLAY_TYPES,
	VIRTUAL_DISPLAY_ID_BASE = HWC_DISPLAY_VIRTUAL,
	};

	HWComposer(
	const sp<SurfaceFlinger>& flinger,
	EventHandler& handler);

	~HWComposer();

	status_t initCheck() const;

	// Returns a display ID starting at VIRTUAL_DISPLAY_ID_BASE, this ID is to
	// be used with createWorkList (and all other methods requiring an ID
	// below).
	// IDs below NUM_BUILTIN_DISPLAYS are pre-defined and therefore are
	// always valid.
	// Returns -1 if an ID cannot be allocated
	int32_t allocateDisplayId();

	// Recycles the given virtual display ID and frees the associated worklist.
	// IDs below NUM_BUILTIN_DISPLAYS are not recycled.
	status_t freeDisplayId(int32_t id);


	// Asks the HAL what it can do
	status_t prepare();

	// commits the list
	status_t commit();

	// set power mode
	status_t setPowerMode(int disp, int mode);

	// set active config
	status_t setActiveConfig(int disp, int mode);

	// reset state when an external, non-virtual display is disconnected
	void disconnectDisplay(int disp);

	// create a work list for numLayers layer. sets HWC_GEOMETRY_CHANGED.
	status_t createWorkList(int32_t id, size_t numLayers);

	bool supportsFramebufferTarget() const;

	// does this display have layers handled by HWC
	bool hasHwcComposition(int32_t id) const;

	// does this display have layers handled by GLES
	bool hasGlesComposition(int32_t id) const;

	// get the releaseFence file descriptor for a display's framebuffer layer.
	// the release fence is only valid after commit()
	sp<Fence> getAndResetReleaseFence(int32_t id);

	// needed forward declarations
	class LayerListIterator;

	// return the visual id to be used to find a suitable EGLConfig for
	// ALL displays.
	int getVisualID() const;

	// Forwarding to FB HAL for pre-HWC-1.1 code (see FramebufferSurface).
	int fbPost(int32_t id, const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf);
	int fbCompositionComplete();
	void fbDump(String8& result);

	// Set the output buffer and acquire fence for a virtual display.
	// Returns INVALID_OPERATION if id is not a virtual display.
	status_t setOutputBuffer(int32_t id, const sp<Fence>& acquireFence,
	const sp<GraphicBuffer>& buf);

	// Get the retire fence for the last committed frame. This fence will
	// signal when the h/w composer is completely finished with the frame.
	// For physical displays, it is no longer being displayed. For virtual
	// displays, writes to the output buffer are complete.
	sp<Fence> getLastRetireFence(int32_t id) const;

	status_t setCursorPositionAsync(int32_t id, const Rect &pos);

	/*
	* Interface to hardware composer's layers functionality.
	* This abstracts the HAL interface to layers which can evolve in
	* incompatible ways from one release to another.
	* The idea is that we could extend this interface as we add
	* features to h/w composer.
	*/
	class HWCLayerInterface {
	protected:
	virtual ~HWCLayerInterface() { }
	public:
	virtual int32_t getCompositionType() const = 0;
	virtual uint32_t getHints() const = 0;
	virtual sp<Fence> getAndResetReleaseFence() = 0;
	virtual void setDefaultState() = 0;
	virtual void setSkip(bool skip) = 0;
	virtual void setIsCursorLayerHint(bool isCursor = true) = 0;
	virtual void setBlending(uint32_t blending) = 0;
	virtual void setTransform(uint32_t transform) = 0;
	virtual void setFrame(const Rect& frame) = 0;
	virtual void setCrop(const FloatRect& crop) = 0;
	virtual void setVisibleRegionScreen(const Region& reg) = 0;
	virtual void setSurfaceDamage(const Region& reg) = 0;
	virtual void setSidebandStream(const sp<NativeHandle>& stream) = 0;
	virtual void setBuffer(const sp<GraphicBuffer>& buffer) = 0;
	virtual void setAcquireFenceFd(int fenceFd) = 0;
	virtual void setPlaneAlpha(uint8_t alpha) = 0;
	virtual void onDisplayed() = 0;
	};

	/*
	* Interface used to implement an iterator to a list
	* of HWCLayer.
	*/
	class HWCLayer : public HWCLayerInterface {
	friend class LayerListIterator;
	// select the layer at the given index
	virtual status_t setLayer(size_t index) = 0;
	virtual HWCLayer* dup() = 0;
	static HWCLayer* copy(HWCLayer *rhs) {
	return rhs ? rhs->dup() : NULL;
	}
	protected:
	virtual ~HWCLayer() { }
	};

	/*
	* Iterator through a HWCLayer list.
	* This behaves more or less like a forward iterator.
	*/
	class LayerListIterator {
	friend class HWComposer;
	HWCLayer* const mLayerList;
	size_t mIndex;

	LayerListIterator() : mLayerList(NULL), mIndex(0) { }

	LayerListIterator(HWCLayer* layer, size_t index)
	: mLayerList(layer), mIndex(index) { }

	// we don't allow assignment, because we don't need it for now
	LayerListIterator& operator = (const LayerListIterator& rhs);

	public:
	// copy operators
	LayerListIterator(const LayerListIterator& rhs)
	: mLayerList(HWCLayer::copy(rhs.mLayerList)), mIndex(rhs.mIndex) {
	}

	~LayerListIterator() { delete mLayerList; }

	// pre-increment
	LayerListIterator& operator++() {
	mLayerList->setLayer(++mIndex);
	return *this;
	}

	// dereference
	HWCLayerInterface& operator * () { return *mLayerList; }
	HWCLayerInterface* operator -> () { return mLayerList; }

	// comparison
	bool operator == (const LayerListIterator& rhs) const {
	return mIndex == rhs.mIndex;
	}
	bool operator != (const LayerListIterator& rhs) const {
	return !operator==(rhs);
	}
	};

	// Returns an iterator to the beginning of the layer list
	LayerListIterator begin(int32_t id);

	// Returns an iterator to the end of the layer list
	LayerListIterator end(int32_t id);


	// Events handling ---------------------------------------------------------

	enum {
	EVENT_VSYNC = HWC_EVENT_VSYNC
	};

	void eventControl(int disp, int event, int enabled);

	struct DisplayConfig {
	uint32_t width;
	uint32_t height;
	float xdpi;
	float ydpi;
	nsecs_t refresh;
	};

	// Query display parameters. Pass in a display index (e.g.
	// HWC_DISPLAY_PRIMARY).
	nsecs_t getRefreshTimestamp(int disp) const;
	sp<Fence> getDisplayFence(int disp) const;
	uint32_t getFormat(int disp) const;
	bool isConnected(int disp) const;

	// These return the values for the current config of a given display index.
	// To get the values for all configs, use getConfigs below.
	uint32_t getWidth(int disp) const;
	uint32_t getHeight(int disp) const;
	float getDpiX(int disp) const;
	float getDpiY(int disp) const;
	nsecs_t getRefreshPeriod(int disp) const;

	const Vector<DisplayConfig>& getConfigs(int disp) const;
	size_t getCurrentConfig(int disp) const;

	status_t setVirtualDisplayProperties(int32_t id, uint32_t w, uint32_t h,
	uint32_t format);

	// this class is only used to fake the VSync event on systems that don't
	// have it.
	class VSyncThread : public Thread {
	HWComposer& mHwc;
	mutable Mutex mLock;
	Condition mCondition;
	bool mEnabled;
	mutable nsecs_t mNextFakeVSync;
	nsecs_t mRefreshPeriod;
	virtual void onFirstRef();
	virtual bool threadLoop();
	public:
	VSyncThread(HWComposer& hwc);
	void setEnabled(bool enabled);
	};

	friend class VSyncThread;

	// for debugging ----------------------------------------------------------
	void dump(String8& out) const;

	private:
	void loadHwcModule();
	int loadFbHalModule();

	LayerListIterator getLayerIterator(int32_t id, size_t index);

	struct cb_context;

	static void hook_invalidate(const struct hwc_procs* procs);
	static void hook_vsync(const struct hwc_procs* procs, int disp,
	int64_t timestamp);
	static void hook_hotplug(const struct hwc_procs* procs, int disp,
	int connected);

	inline void invalidate();
	inline void vsync(int disp, int64_t timestamp);
	inline void hotplug(int disp, int connected);

	status_t queryDisplayProperties(int disp);

	status_t setFramebufferTarget(int32_t id,
	const sp<Fence>& acquireFence, const sp<GraphicBuffer>& buf);

	struct DisplayData {
	DisplayData();
	~DisplayData();
	Vector<DisplayConfig> configs;
	size_t currentConfig;
	uint32_t format; // pixel format from FB hal, for pre-hwc-1.1
	bool connected;
	bool hasFbComp;
	bool hasOvComp;
	size_t capacity;
	hwc_display_contents_1* list;
	hwc_layer_1* framebufferTarget;
	buffer_handle_t fbTargetHandle;
	sp<Fence> lastRetireFence; // signals when the last set op retires
	sp<Fence> lastDisplayFence; // signals when the last set op takes
	// effect on screen
	buffer_handle_t outbufHandle;
	sp<Fence> outbufAcquireFence;

	// protected by mEventControlLock
	int32_t events;
	};

	sp<SurfaceFlinger> mFlinger;
	framebuffer_device_t* mFbDev;
	struct hwc_composer_device_1* mHwc;
	// invariant: mLists[0] != NULL iff mHwc != NULL
	// mLists[i>0] can be NULL. that display is to be ignored
	struct hwc_display_contents_1* mLists[MAX_HWC_DISPLAYS];
	DisplayData mDisplayData[MAX_HWC_DISPLAYS];
	// protect mDisplayData from races between prepare and dump
	mutable Mutex mDisplayLock;
	size_t mNumDisplays;

	cb_context* mCBContext;
	EventHandler& mEventHandler;
	size_t mVSyncCounts[HWC_NUM_PHYSICAL_DISPLAY_TYPES];
	sp<VSyncThread> mVSyncThread;
	bool mDebugForceFakeVSync;
	BitSet32 mAllocatedDisplayIDs;

	// protected by mLock
	mutable Mutex mLock;
	mutable nsecs_t mLastHwVSync[HWC_NUM_PHYSICAL_DISPLAY_TYPES];

	// thread-safe
	mutable Mutex mEventControlLock;
	};

	// ---------------------------------------------------------------------------
	}; // namespace android

	#endif // ANDROID_SF_HWCOMPOSER_H