Layer.h revision 0a61b0c813f5991bf462e36a2314dda062727a10 
1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_LAYER_H
18#define ANDROID_LAYER_H
19
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <EGL/egl.h>
24#include <EGL/eglext.h>
25
26#include <utils/RefBase.h>
27#include <utils/String8.h>
28#include <utils/Timers.h>
29
30#include <gfx/FloatRect.h>
31
32#include <ui/FrameStats.h>
33#include <ui/GraphicBuffer.h>
34#include <ui/PixelFormat.h>
35#include <ui/Region.h>
36
37#include <gui/ISurfaceComposerClient.h>
38
39#include <private/gui/LayerState.h>
40
41#include <list>
42
43#include "FrameTracker.h"
44#include "Client.h"
45#include "LayerVector.h"
46#include "MonitoredProducer.h"
47#include "SurfaceFlinger.h"
48#include "SurfaceFlingerConsumer.h"
49#include "Transform.h"
50
51#include "DisplayHardware/HWComposer.h"
52#include "RenderEngine/Mesh.h"
53#include "RenderEngine/Texture.h"
54
55namespace android {
56
57// ---------------------------------------------------------------------------
58
59class Client;
60class Colorizer;
61class DisplayDevice;
62class GraphicBuffer;
63class SurfaceFlinger;
64
65// ---------------------------------------------------------------------------
66
67/*
68 * A new BufferQueue and a new SurfaceFlingerConsumer are created when the
69 * Layer is first referenced.
70 *
71 * This also implements onFrameAvailable(), which notifies SurfaceFlinger
72 * that new data has arrived.
73 */
74class Layer : public SurfaceFlingerConsumer::ContentsChangedListener {
75    static int32_t sSequence;
76
77public:
78    mutable bool contentDirty;
79    // regions below are in window-manager space
80    Region visibleRegion;
81    Region coveredRegion;
82    Region visibleNonTransparentRegion;
83    Region surfaceDamageRegion;
84
85    // Layer serial number.  This gives layers an explicit ordering, so we
86    // have a stable sort order when their layer stack and Z-order are
87    // the same.
88    int32_t sequence;
89
90    enum { // flags for doTransaction()
91        eDontUpdateGeometryState = 0x00000001,
92        eVisibleRegion = 0x00000002,
93    };
94
95    struct Geometry {
96        uint32_t w;
97        uint32_t h;
98        Transform transform;
99
100        inline bool operator ==(const Geometry& rhs) const {
101            return (w == rhs.w && h == rhs.h) &&
102                    (transform.tx() == rhs.transform.tx()) &&
103                    (transform.ty() == rhs.transform.ty());
104        }
105        inline bool operator !=(const Geometry& rhs) const {
106            return !operator ==(rhs);
107        }
108    };
109
110    struct State {
111        Geometry active;
112        Geometry requested;
113        int32_t z;
114        uint32_t layerStack;
115#ifdef USE_HWC2
116        float alpha;
117#else
118        uint8_t alpha;
119#endif
120        uint8_t flags;
121        uint8_t mask;
122        uint8_t reserved[2];
123        int32_t sequence; // changes when visible regions can change
124        bool modified;
125
126        // Crop is expressed in layer space coordinate.
127        Rect crop;
128        Rect requestedCrop;
129
130        // finalCrop is expressed in display space coordinate.
131        Rect finalCrop;
132
133        // If set, defers this state update until the Layer identified by handle
134        // receives a frame with the given frameNumber
135        wp<IBinder> handle;
136        uint64_t frameNumber;
137
138        // the transparentRegion hint is a bit special, it's latched only
139        // when we receive a buffer -- this is because it's "content"
140        // dependent.
141        Region activeTransparentRegion;
142        Region requestedTransparentRegion;
143        android_dataspace dataSpace;
144
145        uint32_t appId;
146        uint32_t type;
147    };
148
149    // -----------------------------------------------------------------------
150
151    Layer(SurfaceFlinger* flinger, const sp<Client>& client,
152            const String8& name, uint32_t w, uint32_t h, uint32_t flags);
153
154    virtual ~Layer();
155
156    // the this layer's size and format
157    status_t setBuffers(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags);
158
159    // modify current state
160    bool setPosition(float x, float y, bool immediate);
161    bool setLayer(int32_t z);
162    bool setSize(uint32_t w, uint32_t h);
163#ifdef USE_HWC2
164    bool setAlpha(float alpha);
165#else
166    bool setAlpha(uint8_t alpha);
167#endif
168    bool setMatrix(const layer_state_t::matrix22_t& matrix);
169    bool setTransparentRegionHint(const Region& transparent);
170    bool setFlags(uint8_t flags, uint8_t mask);
171    bool setCrop(const Rect& crop, bool immediate);
172    bool setFinalCrop(const Rect& crop);
173    bool setLayerStack(uint32_t layerStack);
174    bool setDataSpace(android_dataspace dataSpace);
175    uint32_t getLayerStack() const;
176    void deferTransactionUntil(const sp<IBinder>& handle, uint64_t frameNumber);
177    bool setOverrideScalingMode(int32_t overrideScalingMode);
178    void setInfo(uint32_t type, uint32_t appId);
179    bool reparentChildren(const sp<IBinder>& layer);
180
181    // If we have received a new buffer this frame, we will pass its surface
182    // damage down to hardware composer. Otherwise, we must send a region with
183    // one empty rect.
184    void useSurfaceDamage();
185    void useEmptyDamage();
186
187    uint32_t getTransactionFlags(uint32_t flags);
188    uint32_t setTransactionFlags(uint32_t flags);
189
190    void computeGeometry(const sp<const DisplayDevice>& hw, Mesh& mesh,
191            bool useIdentityTransform) const;
192    Rect computeBounds(const Region& activeTransparentRegion) const;
193    Rect computeBounds() const;
194
195    int32_t getSequence() const { return sequence; }
196
197    // -----------------------------------------------------------------------
198    // Virtuals
199
200    virtual const char* getTypeId() const { return "Layer"; }
201
202    /*
203     * isOpaque - true if this surface is opaque
204     *
205     * This takes into account the buffer format (i.e. whether or not the
206     * pixel format includes an alpha channel) and the "opaque" flag set
207     * on the layer.  It does not examine the current plane alpha value.
208     */
209    virtual bool isOpaque(const Layer::State& s) const;
210
211    /*
212     * isSecure - true if this surface is secure, that is if it prevents
213     * screenshots or VNC servers.
214     */
215    virtual bool isSecure() const;
216
217    /*
218     * isProtected - true if the layer may contain protected content in the
219     * GRALLOC_USAGE_PROTECTED sense.
220     */
221    virtual bool isProtected() const;
222
223    /*
224     * isVisible - true if this layer is visible, false otherwise
225     */
226    virtual bool isVisible() const;
227
228    /*
229     * isHiddenByPolicy - true if this layer has been forced invisible.
230     * just because this is false, doesn't mean isVisible() is true.
231     * For example if this layer has no active buffer, it may not be hidden by
232     * policy, but it still can not be visible.
233     */
234    virtual bool isHiddenByPolicy() const;
235
236    /*
237     * isFixedSize - true if content has a fixed size
238     */
239    virtual bool isFixedSize() const;
240
241protected:
242    /*
243     * onDraw - draws the surface.
244     */
245    virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip,
246            bool useIdentityTransform) const;
247
248public:
249    // -----------------------------------------------------------------------
250
251#ifdef USE_HWC2
252    void setGeometry(const sp<const DisplayDevice>& displayDevice, uint32_t z);
253    void forceClientComposition(int32_t hwcId);
254    void setPerFrameData(const sp<const DisplayDevice>& displayDevice);
255
256    // callIntoHwc exists so we can update our local state and call
257    // acceptDisplayChanges without unnecessarily updating the device's state
258    void setCompositionType(int32_t hwcId, HWC2::Composition type,
259            bool callIntoHwc = true);
260    HWC2::Composition getCompositionType(int32_t hwcId) const;
261
262    void setClearClientTarget(int32_t hwcId, bool clear);
263    bool getClearClientTarget(int32_t hwcId) const;
264
265    void updateCursorPosition(const sp<const DisplayDevice>& hw);
266#else
267    void setGeometry(const sp<const DisplayDevice>& hw,
268            HWComposer::HWCLayerInterface& layer);
269    void setPerFrameData(const sp<const DisplayDevice>& hw,
270            HWComposer::HWCLayerInterface& layer);
271    void setAcquireFence(const sp<const DisplayDevice>& hw,
272            HWComposer::HWCLayerInterface& layer);
273
274    Rect getPosition(const sp<const DisplayDevice>& hw);
275#endif
276
277    /*
278     * called after page-flip
279     */
280#ifdef USE_HWC2
281    void onLayerDisplayed(const sp<Fence>& releaseFence);
282#else
283    void onLayerDisplayed(const sp<const DisplayDevice>& hw,
284            HWComposer::HWCLayerInterface* layer);
285#endif
286
287    bool shouldPresentNow(const DispSync& dispSync) const;
288
289    /*
290     * called before composition.
291     * returns true if the layer has pending updates.
292     */
293    bool onPreComposition(nsecs_t refreshStartTime);
294
295    /*
296     * called after composition.
297     * returns true if the layer latched a new buffer this frame.
298     */
299    bool onPostComposition(const std::shared_ptr<FenceTime>& glDoneFence,
300            const std::shared_ptr<FenceTime>& presentFence,
301            const std::shared_ptr<FenceTime>& retireFence,
302            const CompositorTiming& compositorTiming);
303
304#ifdef USE_HWC2
305    // If a buffer was replaced this frame, release the former buffer
306    void releasePendingBuffer(nsecs_t dequeueReadyTime);
307#endif
308
309    /*
310     * draw - performs some global clipping optimizations
311     * and calls onDraw().
312     */
313    void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
314    void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const;
315    void draw(const sp<const DisplayDevice>& hw) const;
316
317    /*
318     * doTransaction - process the transaction. This is a good place to figure
319     * out which attributes of the surface have changed.
320     */
321    uint32_t doTransaction(uint32_t transactionFlags);
322
323    /*
324     * setVisibleRegion - called to set the new visible region. This gives
325     * a chance to update the new visible region or record the fact it changed.
326     */
327    void setVisibleRegion(const Region& visibleRegion);
328
329    /*
330     * setCoveredRegion - called when the covered region changes. The covered
331     * region corresponds to any area of the surface that is covered
332     * (transparently or not) by another surface.
333     */
334    void setCoveredRegion(const Region& coveredRegion);
335
336    /*
337     * setVisibleNonTransparentRegion - called when the visible and
338     * non-transparent region changes.
339     */
340    void setVisibleNonTransparentRegion(const Region&
341            visibleNonTransparentRegion);
342
343    /*
344     * latchBuffer - called each time the screen is redrawn and returns whether
345     * the visible regions need to be recomputed (this is a fairly heavy
346     * operation, so this should be set only if needed). Typically this is used
347     * to figure out if the content or size of a surface has changed.
348     */
349    Region latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime);
350
351    bool isPotentialCursor() const { return mPotentialCursor;}
352
353    /*
354     * called with the state lock when the surface is removed from the
355     * current list
356     */
357    void onRemoved();
358
359
360    // Updates the transform hint in our SurfaceFlingerConsumer to match
361    // the current orientation of the display device.
362    void updateTransformHint(const sp<const DisplayDevice>& hw) const;
363
364    /*
365     * returns the rectangle that crops the content of the layer and scales it
366     * to the layer's size.
367     */
368    Rect getContentCrop() const;
369
370    /*
371     * Returns if a frame is queued.
372     */
373    bool hasQueuedFrame() const { return mQueuedFrames > 0 ||
374            mSidebandStreamChanged || mAutoRefresh; }
375
376#ifdef USE_HWC2
377    // -----------------------------------------------------------------------
378
379    bool hasHwcLayer(int32_t hwcId) {
380        if (mHwcLayers.count(hwcId) == 0) {
381            return false;
382        }
383        if (mHwcLayers[hwcId].layer->isAbandoned()) {
384            ALOGI("Erasing abandoned layer %s on %d", mName.string(), hwcId);
385            mHwcLayers.erase(hwcId);
386            return false;
387        }
388        return true;
389    }
390
391    std::shared_ptr<HWC2::Layer> getHwcLayer(int32_t hwcId) {
392        if (mHwcLayers.count(hwcId) == 0) {
393            return nullptr;
394        }
395        return mHwcLayers[hwcId].layer;
396    }
397
398    void setHwcLayer(int32_t hwcId, std::shared_ptr<HWC2::Layer>&& layer) {
399        if (layer) {
400            mHwcLayers[hwcId].layer = layer;
401        } else {
402            mHwcLayers.erase(hwcId);
403        }
404    }
405
406#endif
407    // -----------------------------------------------------------------------
408
409    void clearWithOpenGL(const sp<const DisplayDevice>& hw) const;
410    void setFiltering(bool filtering);
411    bool getFiltering() const;
412
413    // only for debugging
414    inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
415
416    inline  const State&    getDrawingState() const { return mDrawingState; }
417    inline  const State&    getCurrentState() const { return mCurrentState; }
418    inline  State&          getCurrentState()       { return mCurrentState; }
419
420
421    /* always call base class first */
422    void dump(String8& result, Colorizer& colorizer) const;
423#ifdef USE_HWC2
424    static void miniDumpHeader(String8& result);
425    void miniDump(String8& result, int32_t hwcId) const;
426#endif
427    void dumpFrameStats(String8& result) const;
428    void dumpFrameEvents(String8& result);
429    void clearFrameStats();
430    void logFrameStats();
431    void getFrameStats(FrameStats* outStats) const;
432
433    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
434
435    void addAndGetFrameTimestamps(const NewFrameEventsEntry* newEntry,
436            FrameEventHistoryDelta* outDelta);
437
438    bool getTransformToDisplayInverse() const;
439
440    Transform getTransform() const;
441
442    void traverseInReverseZOrder(const std::function<void(Layer*)>& exec);
443    void traverseInZOrder(const std::function<void(Layer*)>& exec);
444
445    void addChild(const sp<Layer>& layer);
446    // Returns index if removed, or negative value otherwise
447    // for symmetry with Vector::remove
448    ssize_t removeChild(const sp<Layer>& layer);
449    sp<Layer> getParent() const { return mParent.promote(); }
450    bool hasParent() const { return getParent() != nullptr; }
451
452    Rect computeScreenBounds(bool reduceTransparentRegion = true) const;
453    bool setChildLayer(const sp<Layer>& childLayer, int32_t z);
454
455    // Copy the current list of children to the drawing state. Called by
456    // SurfaceFlinger to complete a transaction.
457    void commitChildList();
458
459    int32_t getZ() const;
460protected:
461    // constant
462    sp<SurfaceFlinger> mFlinger;
463    /*
464     * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
465     * is called.
466     */
467    class LayerCleaner {
468        sp<SurfaceFlinger> mFlinger;
469        wp<Layer> mLayer;
470    protected:
471        ~LayerCleaner() {
472            // destroy client resources
473            mFlinger->onLayerDestroyed(mLayer);
474        }
475    public:
476        LayerCleaner(const sp<SurfaceFlinger>& flinger,
477                const sp<Layer>& layer)
478            : mFlinger(flinger), mLayer(layer) {
479        }
480    };
481
482
483    virtual void onFirstRef();
484
485
486
487private:
488    friend class SurfaceInterceptor;
489    // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener
490    virtual void onFrameAvailable(const BufferItem& item) override;
491    virtual void onFrameReplaced(const BufferItem& item) override;
492    virtual void onSidebandStreamChanged() override;
493
494    void commitTransaction(const State& stateToCommit);
495
496    // needsLinearFiltering - true if this surface's state requires filtering
497    bool needsFiltering(const sp<const DisplayDevice>& hw) const;
498
499    uint32_t getEffectiveUsage(uint32_t usage) const;
500
501    gfx::FloatRect computeCrop(const sp<const DisplayDevice>& hw) const;
502    // Compute the initial crop as specified by parent layers and the SurfaceControl
503    // for this layer. Does not include buffer crop from the IGraphicBufferProducer
504    // client, as that should not affect child clipping. Returns in screen space.
505    Rect computeInitialCrop(const sp<const DisplayDevice>& hw) const;
506    bool isCropped() const;
507    static bool getOpacityForFormat(uint32_t format);
508
509    // drawing
510    void clearWithOpenGL(const sp<const DisplayDevice>& hw,
511            float r, float g, float b, float alpha) const;
512    void drawWithOpenGL(const sp<const DisplayDevice>& hw,
513            bool useIdentityTransform) const;
514
515    // Temporary - Used only for LEGACY camera mode.
516    uint32_t getProducerStickyTransform() const;
517
518    // Loads the corresponding system property once per process
519    static bool latchUnsignaledBuffers();
520
521    void setParent(const sp<Layer>& layer);
522
523    // -----------------------------------------------------------------------
524
525    class SyncPoint
526    {
527    public:
528        explicit SyncPoint(uint64_t frameNumber) : mFrameNumber(frameNumber),
529                mFrameIsAvailable(false), mTransactionIsApplied(false) {}
530
531        uint64_t getFrameNumber() const {
532            return mFrameNumber;
533        }
534
535        bool frameIsAvailable() const {
536            return mFrameIsAvailable;
537        }
538
539        void setFrameAvailable() {
540            mFrameIsAvailable = true;
541        }
542
543        bool transactionIsApplied() const {
544            return mTransactionIsApplied;
545        }
546
547        void setTransactionApplied() {
548            mTransactionIsApplied = true;
549        }
550
551    private:
552        const uint64_t mFrameNumber;
553        std::atomic<bool> mFrameIsAvailable;
554        std::atomic<bool> mTransactionIsApplied;
555    };
556
557    // SyncPoints which will be signaled when the correct frame is at the head
558    // of the queue and dropped after the frame has been latched. Protected by
559    // mLocalSyncPointMutex.
560    Mutex mLocalSyncPointMutex;
561    std::list<std::shared_ptr<SyncPoint>> mLocalSyncPoints;
562
563    // SyncPoints which will be signaled and then dropped when the transaction
564    // is applied
565    std::list<std::shared_ptr<SyncPoint>> mRemoteSyncPoints;
566
567    uint64_t getHeadFrameNumber() const;
568    bool headFenceHasSignaled() const;
569
570    // Returns false if the relevant frame has already been latched
571    bool addSyncPoint(const std::shared_ptr<SyncPoint>& point);
572
573    void pushPendingState();
574    void popPendingState(State* stateToCommit);
575    bool applyPendingStates(State* stateToCommit);
576
577    void clearSyncPoints();
578
579    // Returns mCurrentScaling mode (originating from the
580    // Client) or mOverrideScalingMode mode (originating from
581    // the Surface Controller) if set.
582    uint32_t getEffectiveScalingMode() const;
583public:
584    /*
585     * The layer handle is just a BBinder object passed to the client
586     * (remote process) -- we don't keep any reference on our side such that
587     * the dtor is called when the remote side let go of its reference.
588     *
589     * LayerCleaner ensures that mFlinger->onLayerDestroyed() is called for
590     * this layer when the handle is destroyed.
591     */
592    class Handle : public BBinder, public LayerCleaner {
593        public:
594            Handle(const sp<SurfaceFlinger>& flinger, const sp<Layer>& layer)
595                : LayerCleaner(flinger, layer), owner(layer) {}
596
597            wp<Layer> owner;
598    };
599
600    sp<IBinder> getHandle();
601    sp<IGraphicBufferProducer> getProducer() const;
602    const String8& getName() const;
603    void notifyAvailableFrames();
604private:
605
606    // -----------------------------------------------------------------------
607
608    // Check all of the local sync points to ensure that all transactions
609    // which need to have been applied prior to the frame which is about to
610    // be latched have signaled
611    bool allTransactionsSignaled();
612
613    // constants
614    sp<SurfaceFlingerConsumer> mSurfaceFlingerConsumer;
615    sp<IGraphicBufferProducer> mProducer;
616    uint32_t mTextureName;      // from GLES
617    bool mPremultipliedAlpha;
618    String8 mName;
619    PixelFormat mFormat;
620
621    // these are protected by an external lock
622    State mCurrentState;
623    State mDrawingState;
624    volatile int32_t mTransactionFlags;
625
626    // Accessed from main thread and binder threads
627    Mutex mPendingStateMutex;
628    Vector<State> mPendingStates;
629
630    // thread-safe
631    volatile int32_t mQueuedFrames;
632    volatile int32_t mSidebandStreamChanged; // used like an atomic boolean
633
634    // Timestamp history for UIAutomation. Thread safe.
635    FrameTracker mFrameTracker;
636
637    // Timestamp history for the consumer to query.
638    // Accessed by both consumer and producer on main and binder threads.
639    Mutex mFrameEventHistoryMutex;
640    ConsumerFrameEventHistory mFrameEventHistory;
641    FenceTimeline mAcquireTimeline;
642    FenceTimeline mReleaseTimeline;
643
644    // main thread
645    sp<GraphicBuffer> mActiveBuffer;
646    sp<NativeHandle> mSidebandStream;
647    Rect mCurrentCrop;
648    uint32_t mCurrentTransform;
649    uint32_t mCurrentScalingMode;
650    // We encode unset as -1.
651    int32_t mOverrideScalingMode;
652    bool mCurrentOpacity;
653    bool mBufferLatched = false;  // TODO: Use mActiveBuffer?
654    std::atomic<uint64_t> mCurrentFrameNumber;
655    uint64_t mPreviousFrameNumber; // Only accessed on the main thread.
656    bool mRefreshPending;
657    bool mFrameLatencyNeeded;
658    // Whether filtering is forced on or not
659    bool mFiltering;
660    // Whether filtering is needed b/c of the drawingstate
661    bool mNeedsFiltering;
662    // The mesh used to draw the layer in GLES composition mode
663    mutable Mesh mMesh;
664    // The texture used to draw the layer in GLES composition mode
665    mutable Texture mTexture;
666
667#ifdef USE_HWC2
668    // HWC items, accessed from the main thread
669    struct HWCInfo {
670        HWCInfo()
671          : layer(),
672            forceClientComposition(false),
673            compositionType(HWC2::Composition::Invalid),
674            clearClientTarget(false) {}
675
676        std::shared_ptr<HWC2::Layer> layer;
677        bool forceClientComposition;
678        HWC2::Composition compositionType;
679        bool clearClientTarget;
680        Rect displayFrame;
681        gfx::FloatRect sourceCrop;
682    };
683    std::unordered_map<int32_t, HWCInfo> mHwcLayers;
684#else
685    bool mIsGlesComposition;
686#endif
687
688    // page-flip thread (currently main thread)
689    bool mProtectedByApp; // application requires protected path to external sink
690
691    // protected by mLock
692    mutable Mutex mLock;
693    // Set to true once we've returned this surface's handle
694    mutable bool mHasSurface;
695    const wp<Client> mClientRef;
696
697    // This layer can be a cursor on some displays.
698    bool mPotentialCursor;
699
700    // Local copy of the queued contents of the incoming BufferQueue
701    mutable Mutex mQueueItemLock;
702    Condition mQueueItemCondition;
703    Vector<BufferItem> mQueueItems;
704    std::atomic<uint64_t> mLastFrameNumberReceived;
705    bool mUpdateTexImageFailed; // This is only accessed on the main thread.
706
707    bool mAutoRefresh;
708    bool mFreezePositionUpdates;
709
710    // Child list about to be committed/used for editing.
711    LayerVector mCurrentChildren;
712    // Child list used for rendering.
713    LayerVector mDrawingChildren;
714
715    wp<Layer> mParent;
716};
717
718// ---------------------------------------------------------------------------
719
720}; // namespace android
721
722#endif // ANDROID_LAYER_H
723