Layer.h revision d8ab4396a858a9c929a1bb3cadf7705fb8061574 
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 <ui/FrameStats.h>
31#include <ui/GraphicBuffer.h>
32#include <ui/PixelFormat.h>
33#include <ui/Region.h>
34
35#include <gui/ISurfaceComposerClient.h>
36
37#include <private/gui/LayerState.h>
38
39#include <list>
40
41#include "FrameTracker.h"
42#include "Client.h"
43#include "LayerVector.h"
44#include "MonitoredProducer.h"
45#include "SurfaceFlinger.h"
46#include "SurfaceFlingerConsumer.h"
47#include "Transform.h"
48
49#include "DisplayHardware/HWComposer.h"
50#include "DisplayHardware/HWComposerBufferCache.h"
51#include "RenderEngine/Mesh.h"
52#include "RenderEngine/Texture.h"
53
54namespace android {
55
56// ---------------------------------------------------------------------------
57
58class Client;
59class Colorizer;
60class DisplayDevice;
61class GraphicBuffer;
62class SurfaceFlinger;
63
64// ---------------------------------------------------------------------------
65
66/*
67 * A new BufferQueue and a new SurfaceFlingerConsumer are created when the
68 * Layer is first referenced.
69 *
70 * This also implements onFrameAvailable(), which notifies SurfaceFlinger
71 * that new data has arrived.
72 */
73class Layer : public SurfaceFlingerConsumer::ContentsChangedListener {
74    static int32_t sSequence;
75
76public:
77    mutable bool contentDirty;
78    // regions below are in window-manager space
79    Region visibleRegion;
80    Region coveredRegion;
81    Region visibleNonTransparentRegion;
82    Region surfaceDamageRegion;
83
84    // Layer serial number.  This gives layers an explicit ordering, so we
85    // have a stable sort order when their layer stack and Z-order are
86    // the same.
87    int32_t sequence;
88
89    enum { // flags for doTransaction()
90        eDontUpdateGeometryState = 0x00000001,
91        eVisibleRegion = 0x00000002,
92    };
93
94    struct Geometry {
95        uint32_t w;
96        uint32_t h;
97        Transform transform;
98
99        inline bool operator ==(const Geometry& rhs) const {
100            return (w == rhs.w && h == rhs.h) &&
101                    (transform.tx() == rhs.transform.tx()) &&
102                    (transform.ty() == rhs.transform.ty());
103        }
104        inline bool operator !=(const Geometry& rhs) const {
105            return !operator ==(rhs);
106        }
107    };
108
109    struct State {
110        Geometry active;
111        Geometry requested;
112        int32_t z;
113
114        // The identifier of the layer stack this layer belongs to. A layer can
115        // only be associated to a single layer stack. A layer stack is a
116        // z-ordered group of layers which can be associated to one or more
117        // displays. Using the same layer stack on different displays is a way
118        // to achieve mirroring.
119        uint32_t layerStack;
120
121#ifdef USE_HWC2
122        float alpha;
123#else
124        uint8_t alpha;
125#endif
126        uint8_t flags;
127        uint8_t mask;
128        uint8_t reserved[2];
129        int32_t sequence; // changes when visible regions can change
130        bool modified;
131
132        // Crop is expressed in layer space coordinate.
133        Rect crop;
134        Rect requestedCrop;
135
136        // finalCrop is expressed in display space coordinate.
137        Rect finalCrop;
138
139        // If set, defers this state update until the identified Layer
140        // receives a frame with the given frameNumber
141        wp<Layer> barrierLayer;
142        uint64_t frameNumber;
143
144        // the transparentRegion hint is a bit special, it's latched only
145        // when we receive a buffer -- this is because it's "content"
146        // dependent.
147        Region activeTransparentRegion;
148        Region requestedTransparentRegion;
149        android_dataspace dataSpace;
150
151        uint32_t appId;
152        uint32_t type;
153    };
154
155    // -----------------------------------------------------------------------
156
157    Layer(SurfaceFlinger* flinger, const sp<Client>& client,
158            const String8& name, uint32_t w, uint32_t h, uint32_t flags);
159
160    virtual ~Layer();
161
162    // the this layer's size and format
163    status_t setBuffers(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags);
164
165    // modify current state
166    bool setPosition(float x, float y, bool immediate);
167    bool setLayer(int32_t z);
168    bool setSize(uint32_t w, uint32_t h);
169#ifdef USE_HWC2
170    bool setAlpha(float alpha);
171#else
172    bool setAlpha(uint8_t alpha);
173#endif
174    bool setMatrix(const layer_state_t::matrix22_t& matrix);
175    bool setTransparentRegionHint(const Region& transparent);
176    bool setFlags(uint8_t flags, uint8_t mask);
177    bool setCrop(const Rect& crop, bool immediate);
178    bool setFinalCrop(const Rect& crop);
179    bool setLayerStack(uint32_t layerStack);
180    bool setDataSpace(android_dataspace dataSpace);
181    uint32_t getLayerStack() const;
182    void deferTransactionUntil(const sp<IBinder>& barrierHandle, uint64_t frameNumber);
183    void deferTransactionUntil(const sp<Layer>& barrierLayer, uint64_t frameNumber);
184    bool setOverrideScalingMode(int32_t overrideScalingMode);
185    void setInfo(uint32_t type, uint32_t appId);
186    bool reparentChildren(const sp<IBinder>& layer);
187    bool detachChildren();
188
189    // If we have received a new buffer this frame, we will pass its surface
190    // damage down to hardware composer. Otherwise, we must send a region with
191    // one empty rect.
192    void useSurfaceDamage();
193    void useEmptyDamage();
194
195    uint32_t getTransactionFlags(uint32_t flags);
196    uint32_t setTransactionFlags(uint32_t flags);
197
198    void computeGeometry(const sp<const DisplayDevice>& hw, Mesh& mesh,
199            bool useIdentityTransform) const;
200    Rect computeBounds(const Region& activeTransparentRegion) const;
201    Rect computeBounds() const;
202
203    int32_t getSequence() const { return sequence; }
204
205    // -----------------------------------------------------------------------
206    // Virtuals
207
208    virtual const char* getTypeId() const { return "Layer"; }
209
210    /*
211     * isOpaque - true if this surface is opaque
212     *
213     * This takes into account the buffer format (i.e. whether or not the
214     * pixel format includes an alpha channel) and the "opaque" flag set
215     * on the layer.  It does not examine the current plane alpha value.
216     */
217    virtual bool isOpaque(const Layer::State& s) const;
218
219    /*
220     * isSecure - true if this surface is secure, that is if it prevents
221     * screenshots or VNC servers.
222     */
223    virtual bool isSecure() const;
224
225    /*
226     * isProtected - true if the layer may contain protected content in the
227     * GRALLOC_USAGE_PROTECTED sense.
228     */
229    virtual bool isProtected() const;
230
231    /*
232     * isVisible - true if this layer is visible, false otherwise
233     */
234    virtual bool isVisible() const;
235
236    /*
237     * isHiddenByPolicy - true if this layer has been forced invisible.
238     * just because this is false, doesn't mean isVisible() is true.
239     * For example if this layer has no active buffer, it may not be hidden by
240     * policy, but it still can not be visible.
241     */
242    virtual bool isHiddenByPolicy() const;
243
244    /*
245     * isFixedSize - true if content has a fixed size
246     */
247    virtual bool isFixedSize() const;
248
249protected:
250    /*
251     * onDraw - draws the surface.
252     */
253    virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip,
254            bool useIdentityTransform) const;
255
256public:
257    // -----------------------------------------------------------------------
258
259#ifdef USE_HWC2
260    void setGeometry(const sp<const DisplayDevice>& displayDevice, uint32_t z);
261    void forceClientComposition(int32_t hwcId);
262    void setPerFrameData(const sp<const DisplayDevice>& displayDevice);
263
264    android_dataspace getDataSpace() const;
265
266    // callIntoHwc exists so we can update our local state and call
267    // acceptDisplayChanges without unnecessarily updating the device's state
268    void setCompositionType(int32_t hwcId, HWC2::Composition type,
269            bool callIntoHwc = true);
270    HWC2::Composition getCompositionType(int32_t hwcId) const;
271
272    void setClearClientTarget(int32_t hwcId, bool clear);
273    bool getClearClientTarget(int32_t hwcId) const;
274
275    void updateCursorPosition(const sp<const DisplayDevice>& hw);
276#else
277    void setGeometry(const sp<const DisplayDevice>& hw,
278            HWComposer::HWCLayerInterface& layer);
279    void setPerFrameData(const sp<const DisplayDevice>& hw,
280            HWComposer::HWCLayerInterface& layer);
281    void setAcquireFence(const sp<const DisplayDevice>& hw,
282            HWComposer::HWCLayerInterface& layer);
283
284    Rect getPosition(const sp<const DisplayDevice>& hw);
285#endif
286
287    /*
288     * called after page-flip
289     */
290#ifdef USE_HWC2
291    void onLayerDisplayed(const sp<Fence>& releaseFence);
292#else
293    void onLayerDisplayed(const sp<const DisplayDevice>& hw,
294            HWComposer::HWCLayerInterface* layer);
295#endif
296
297    bool shouldPresentNow(const DispSync& dispSync) const;
298
299    /*
300     * called before composition.
301     * returns true if the layer has pending updates.
302     */
303    bool onPreComposition(nsecs_t refreshStartTime);
304
305    /*
306     * called after composition.
307     * returns true if the layer latched a new buffer this frame.
308     */
309    bool onPostComposition(const std::shared_ptr<FenceTime>& glDoneFence,
310            const std::shared_ptr<FenceTime>& presentFence,
311            const CompositorTiming& compositorTiming);
312
313#ifdef USE_HWC2
314    // If a buffer was replaced this frame, release the former buffer
315    void releasePendingBuffer(nsecs_t dequeueReadyTime);
316#endif
317
318    /*
319     * draw - performs some global clipping optimizations
320     * and calls onDraw().
321     */
322    void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
323    void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const;
324    void draw(const sp<const DisplayDevice>& hw) const;
325
326    /*
327     * doTransaction - process the transaction. This is a good place to figure
328     * out which attributes of the surface have changed.
329     */
330    uint32_t doTransaction(uint32_t transactionFlags);
331
332    /*
333     * setVisibleRegion - called to set the new visible region. This gives
334     * a chance to update the new visible region or record the fact it changed.
335     */
336    void setVisibleRegion(const Region& visibleRegion);
337
338    /*
339     * setCoveredRegion - called when the covered region changes. The covered
340     * region corresponds to any area of the surface that is covered
341     * (transparently or not) by another surface.
342     */
343    void setCoveredRegion(const Region& coveredRegion);
344
345    /*
346     * setVisibleNonTransparentRegion - called when the visible and
347     * non-transparent region changes.
348     */
349    void setVisibleNonTransparentRegion(const Region&
350            visibleNonTransparentRegion);
351
352    /*
353     * latchBuffer - called each time the screen is redrawn and returns whether
354     * the visible regions need to be recomputed (this is a fairly heavy
355     * operation, so this should be set only if needed). Typically this is used
356     * to figure out if the content or size of a surface has changed.
357     */
358    Region latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime);
359
360    bool isPotentialCursor() const { return mPotentialCursor;}
361
362    /*
363     * called with the state lock when the surface is removed from the
364     * current list
365     */
366    void onRemoved();
367
368
369    // Updates the transform hint in our SurfaceFlingerConsumer to match
370    // the current orientation of the display device.
371    void updateTransformHint(const sp<const DisplayDevice>& hw) const;
372
373    /*
374     * returns the rectangle that crops the content of the layer and scales it
375     * to the layer's size.
376     */
377    Rect getContentCrop() const;
378
379    /*
380     * Returns if a frame is queued.
381     */
382    bool hasQueuedFrame() const { return mQueuedFrames > 0 ||
383            mSidebandStreamChanged || mAutoRefresh; }
384
385#ifdef USE_HWC2
386    // -----------------------------------------------------------------------
387
388    bool hasHwcLayer(int32_t hwcId) {
389        if (mHwcLayers.count(hwcId) == 0) {
390            return false;
391        }
392        if (mHwcLayers[hwcId].layer->isAbandoned()) {
393            ALOGI("Erasing abandoned layer %s on %d", mName.string(), hwcId);
394            mHwcLayers.erase(hwcId);
395            return false;
396        }
397        return true;
398    }
399
400    std::shared_ptr<HWC2::Layer> getHwcLayer(int32_t hwcId) {
401        if (mHwcLayers.count(hwcId) == 0) {
402            return nullptr;
403        }
404        return mHwcLayers[hwcId].layer;
405    }
406
407    void setHwcLayer(int32_t hwcId, std::shared_ptr<HWC2::Layer>&& layer) {
408        if (layer) {
409            mHwcLayers[hwcId].layer = layer;
410        } else {
411            mHwcLayers.erase(hwcId);
412        }
413    }
414
415    void clearHwcLayers() {
416        mHwcLayers.clear();
417    }
418
419#endif
420    // -----------------------------------------------------------------------
421
422    void clearWithOpenGL(const sp<const DisplayDevice>& hw) const;
423    void setFiltering(bool filtering);
424    bool getFiltering() const;
425
426    // only for debugging
427    inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
428
429    inline  const State&    getDrawingState() const { return mDrawingState; }
430    inline  const State&    getCurrentState() const { return mCurrentState; }
431    inline  State&          getCurrentState()       { return mCurrentState; }
432
433
434    /* always call base class first */
435    void dump(String8& result, Colorizer& colorizer) const;
436#ifdef USE_HWC2
437    static void miniDumpHeader(String8& result);
438    void miniDump(String8& result, int32_t hwcId) const;
439#endif
440    void dumpFrameStats(String8& result) const;
441    void dumpFrameEvents(String8& result);
442    void clearFrameStats();
443    void logFrameStats();
444    void getFrameStats(FrameStats* outStats) const;
445
446    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
447
448    void onDisconnect();
449    void addAndGetFrameTimestamps(const NewFrameEventsEntry* newEntry,
450            FrameEventHistoryDelta* outDelta);
451
452    bool getTransformToDisplayInverse() const;
453
454    Transform getTransform() const;
455
456    void traverseInReverseZOrder(const std::function<void(Layer*)>& exec);
457    void traverseInZOrder(const std::function<void(Layer*)>& exec);
458
459    void addChild(const sp<Layer>& layer);
460    // Returns index if removed, or negative value otherwise
461    // for symmetry with Vector::remove
462    ssize_t removeChild(const sp<Layer>& layer);
463    sp<Layer> getParent() const { return mParent.promote(); }
464    bool hasParent() const { return getParent() != nullptr; }
465
466    Rect computeScreenBounds(bool reduceTransparentRegion = true) const;
467    bool setChildLayer(const sp<Layer>& childLayer, int32_t z);
468
469    // Copy the current list of children to the drawing state. Called by
470    // SurfaceFlinger to complete a transaction.
471    void commitChildList();
472
473    int32_t getZ() const;
474protected:
475    // constant
476    sp<SurfaceFlinger> mFlinger;
477    /*
478     * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
479     * is called.
480     */
481    class LayerCleaner {
482        sp<SurfaceFlinger> mFlinger;
483        wp<Layer> mLayer;
484    protected:
485        ~LayerCleaner() {
486            // destroy client resources
487            mFlinger->onLayerDestroyed(mLayer);
488        }
489    public:
490        LayerCleaner(const sp<SurfaceFlinger>& flinger,
491                const sp<Layer>& layer)
492            : mFlinger(flinger), mLayer(layer) {
493        }
494    };
495
496
497    virtual void onFirstRef();
498
499
500
501private:
502    friend class SurfaceInterceptor;
503    // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener
504    virtual void onFrameAvailable(const BufferItem& item) override;
505    virtual void onFrameReplaced(const BufferItem& item) override;
506    virtual void onSidebandStreamChanged() override;
507
508    void commitTransaction(const State& stateToCommit);
509
510    // needsLinearFiltering - true if this surface's state requires filtering
511    bool needsFiltering(const sp<const DisplayDevice>& hw) const;
512
513    uint32_t getEffectiveUsage(uint32_t usage) const;
514
515    FloatRect computeCrop(const sp<const DisplayDevice>& hw) const;
516    // Compute the initial crop as specified by parent layers and the SurfaceControl
517    // for this layer. Does not include buffer crop from the IGraphicBufferProducer
518    // client, as that should not affect child clipping. Returns in screen space.
519    Rect computeInitialCrop(const sp<const DisplayDevice>& hw) const;
520    bool isCropped() const;
521    static bool getOpacityForFormat(uint32_t format);
522
523    // drawing
524    void clearWithOpenGL(const sp<const DisplayDevice>& hw,
525            float r, float g, float b, float alpha) const;
526    void drawWithOpenGL(const sp<const DisplayDevice>& hw,
527            bool useIdentityTransform) const;
528
529    // Temporary - Used only for LEGACY camera mode.
530    uint32_t getProducerStickyTransform() const;
531
532    // Loads the corresponding system property once per process
533    static bool latchUnsignaledBuffers();
534
535    void setParent(const sp<Layer>& layer);
536
537    // -----------------------------------------------------------------------
538
539    class SyncPoint
540    {
541    public:
542        explicit SyncPoint(uint64_t frameNumber) : mFrameNumber(frameNumber),
543                mFrameIsAvailable(false), mTransactionIsApplied(false) {}
544
545        uint64_t getFrameNumber() const {
546            return mFrameNumber;
547        }
548
549        bool frameIsAvailable() const {
550            return mFrameIsAvailable;
551        }
552
553        void setFrameAvailable() {
554            mFrameIsAvailable = true;
555        }
556
557        bool transactionIsApplied() const {
558            return mTransactionIsApplied;
559        }
560
561        void setTransactionApplied() {
562            mTransactionIsApplied = true;
563        }
564
565    private:
566        const uint64_t mFrameNumber;
567        std::atomic<bool> mFrameIsAvailable;
568        std::atomic<bool> mTransactionIsApplied;
569    };
570
571    // SyncPoints which will be signaled when the correct frame is at the head
572    // of the queue and dropped after the frame has been latched. Protected by
573    // mLocalSyncPointMutex.
574    Mutex mLocalSyncPointMutex;
575    std::list<std::shared_ptr<SyncPoint>> mLocalSyncPoints;
576
577    // SyncPoints which will be signaled and then dropped when the transaction
578    // is applied
579    std::list<std::shared_ptr<SyncPoint>> mRemoteSyncPoints;
580
581    uint64_t getHeadFrameNumber() const;
582    bool headFenceHasSignaled() const;
583
584    // Returns false if the relevant frame has already been latched
585    bool addSyncPoint(const std::shared_ptr<SyncPoint>& point);
586
587    void pushPendingState();
588    void popPendingState(State* stateToCommit);
589    bool applyPendingStates(State* stateToCommit);
590
591    void clearSyncPoints();
592
593    // Returns mCurrentScaling mode (originating from the
594    // Client) or mOverrideScalingMode mode (originating from
595    // the Surface Controller) if set.
596    uint32_t getEffectiveScalingMode() const;
597public:
598    /*
599     * The layer handle is just a BBinder object passed to the client
600     * (remote process) -- we don't keep any reference on our side such that
601     * the dtor is called when the remote side let go of its reference.
602     *
603     * LayerCleaner ensures that mFlinger->onLayerDestroyed() is called for
604     * this layer when the handle is destroyed.
605     */
606    class Handle : public BBinder, public LayerCleaner {
607        public:
608            Handle(const sp<SurfaceFlinger>& flinger, const sp<Layer>& layer)
609                : LayerCleaner(flinger, layer), owner(layer) {}
610
611            wp<Layer> owner;
612    };
613
614    sp<IBinder> getHandle();
615    sp<IGraphicBufferProducer> getProducer() const;
616    const String8& getName() const;
617    void notifyAvailableFrames();
618private:
619
620    // -----------------------------------------------------------------------
621
622    // Check all of the local sync points to ensure that all transactions
623    // which need to have been applied prior to the frame which is about to
624    // be latched have signaled
625    bool allTransactionsSignaled();
626
627    // constants
628    sp<SurfaceFlingerConsumer> mSurfaceFlingerConsumer;
629    sp<IGraphicBufferProducer> mProducer;
630    uint32_t mTextureName;      // from GLES
631    bool mPremultipliedAlpha;
632    String8 mName;
633    PixelFormat mFormat;
634
635    // these are protected by an external lock
636    State mCurrentState;
637    State mDrawingState;
638    volatile int32_t mTransactionFlags;
639
640    // Accessed from main thread and binder threads
641    Mutex mPendingStateMutex;
642    Vector<State> mPendingStates;
643
644    // thread-safe
645    volatile int32_t mQueuedFrames;
646    volatile int32_t mSidebandStreamChanged; // used like an atomic boolean
647
648    // Timestamp history for UIAutomation. Thread safe.
649    FrameTracker mFrameTracker;
650
651    // Timestamp history for the consumer to query.
652    // Accessed by both consumer and producer on main and binder threads.
653    Mutex mFrameEventHistoryMutex;
654    ConsumerFrameEventHistory mFrameEventHistory;
655    FenceTimeline mAcquireTimeline;
656    FenceTimeline mReleaseTimeline;
657
658    // main thread
659    int mActiveBufferSlot;
660    sp<GraphicBuffer> mActiveBuffer;
661    sp<NativeHandle> mSidebandStream;
662    Rect mCurrentCrop;
663    uint32_t mCurrentTransform;
664    uint32_t mCurrentScalingMode;
665    // We encode unset as -1.
666    int32_t mOverrideScalingMode;
667    bool mCurrentOpacity;
668    bool mBufferLatched = false;  // TODO: Use mActiveBuffer?
669    std::atomic<uint64_t> mCurrentFrameNumber;
670    uint64_t mPreviousFrameNumber; // Only accessed on the main thread.
671    bool mRefreshPending;
672    bool mFrameLatencyNeeded;
673    // Whether filtering is forced on or not
674    bool mFiltering;
675    // Whether filtering is needed b/c of the drawingstate
676    bool mNeedsFiltering;
677    // The mesh used to draw the layer in GLES composition mode
678    mutable Mesh mMesh;
679    // The texture used to draw the layer in GLES composition mode
680    mutable Texture mTexture;
681
682#ifdef USE_HWC2
683    // HWC items, accessed from the main thread
684    struct HWCInfo {
685        HWCInfo()
686          : layer(),
687            forceClientComposition(false),
688            compositionType(HWC2::Composition::Invalid),
689            clearClientTarget(false) {}
690
691        std::shared_ptr<HWC2::Layer> layer;
692        bool forceClientComposition;
693        HWC2::Composition compositionType;
694        bool clearClientTarget;
695        Rect displayFrame;
696        FloatRect sourceCrop;
697        HWComposerBufferCache bufferCache;
698    };
699
700    // A layer can be attached to multiple displays when operating in mirror mode
701    // (a.k.a: when several displays are attached with equal layerStack). In this
702    // case we need to keep track. In non-mirror mode, a layer will have only one
703    // HWCInfo. This map key is a display layerStack.
704    std::unordered_map<int32_t, HWCInfo> mHwcLayers;
705#else
706    bool mIsGlesComposition;
707#endif
708
709    // page-flip thread (currently main thread)
710    bool mProtectedByApp; // application requires protected path to external sink
711
712    // protected by mLock
713    mutable Mutex mLock;
714    // Set to true once we've returned this surface's handle
715    mutable bool mHasSurface;
716    const wp<Client> mClientRef;
717
718    // This layer can be a cursor on some displays.
719    bool mPotentialCursor;
720
721    // Local copy of the queued contents of the incoming BufferQueue
722    mutable Mutex mQueueItemLock;
723    Condition mQueueItemCondition;
724    Vector<BufferItem> mQueueItems;
725    std::atomic<uint64_t> mLastFrameNumberReceived;
726    bool mUpdateTexImageFailed; // This is only accessed on the main thread.
727
728    bool mAutoRefresh;
729    bool mFreezePositionUpdates;
730
731    // Child list about to be committed/used for editing.
732    LayerVector mCurrentChildren;
733    // Child list used for rendering.
734    LayerVector mDrawingChildren;
735
736    wp<Layer> mParent;
737};
738
739// ---------------------------------------------------------------------------
740
741}; // namespace android
742
743#endif // ANDROID_LAYER_H
744