Layer.h revision fb94f1db72bd769d4a63e2baf0b5a4ca5da7a86f 
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 "RenderEngine/Mesh.h"
51#include "RenderEngine/Texture.h"
52
53namespace android {
54
55// ---------------------------------------------------------------------------
56
57class Client;
58class Colorizer;
59class DisplayDevice;
60class GraphicBuffer;
61class SurfaceFlinger;
62
63// ---------------------------------------------------------------------------
64
65/*
66 * A new BufferQueue and a new SurfaceFlingerConsumer are created when the
67 * Layer is first referenced.
68 *
69 * This also implements onFrameAvailable(), which notifies SurfaceFlinger
70 * that new data has arrived.
71 */
72class Layer : public SurfaceFlingerConsumer::ContentsChangedListener {
73    static int32_t sSequence;
74
75public:
76    mutable bool contentDirty;
77    // regions below are in window-manager space
78    Region visibleRegion;
79    Region coveredRegion;
80    Region visibleNonTransparentRegion;
81    Region surfaceDamageRegion;
82
83    // Layer serial number.  This gives layers an explicit ordering, so we
84    // have a stable sort order when their layer stack and Z-order are
85    // the same.
86    int32_t sequence;
87
88    enum { // flags for doTransaction()
89        eDontUpdateGeometryState = 0x00000001,
90        eVisibleRegion = 0x00000002,
91    };
92
93    struct Geometry {
94        uint32_t w;
95        uint32_t h;
96        Transform transform;
97
98        inline bool operator ==(const Geometry& rhs) const {
99            return (w == rhs.w && h == rhs.h) &&
100                    (transform.tx() == rhs.transform.tx()) &&
101                    (transform.ty() == rhs.transform.ty());
102        }
103        inline bool operator !=(const Geometry& rhs) const {
104            return !operator ==(rhs);
105        }
106    };
107
108    struct State {
109        Geometry active;
110        Geometry requested;
111        int32_t z;
112        uint32_t layerStack;
113#ifdef USE_HWC2
114        float alpha;
115#else
116        uint8_t alpha;
117#endif
118        uint8_t flags;
119        uint8_t mask;
120        uint8_t reserved[2];
121        int32_t sequence; // changes when visible regions can change
122        bool modified;
123
124        // Crop is expressed in layer space coordinate.
125        Rect crop;
126        Rect requestedCrop;
127
128        // finalCrop is expressed in display space coordinate.
129        Rect finalCrop;
130
131        // If set, defers this state update until the Layer identified by handle
132        // receives a frame with the given frameNumber
133        wp<IBinder> handle;
134        uint64_t frameNumber;
135
136        // the transparentRegion hint is a bit special, it's latched only
137        // when we receive a buffer -- this is because it's "content"
138        // dependent.
139        Region activeTransparentRegion;
140        Region requestedTransparentRegion;
141        android_dataspace dataSpace;
142
143        uint32_t appId;
144        uint32_t type;
145    };
146
147    // -----------------------------------------------------------------------
148
149    Layer(SurfaceFlinger* flinger, const sp<Client>& client,
150            const String8& name, uint32_t w, uint32_t h, uint32_t flags);
151
152    virtual ~Layer();
153
154    // the this layer's size and format
155    status_t setBuffers(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags);
156
157    // modify current state
158    bool setPosition(float x, float y, bool immediate);
159    bool setLayer(int32_t z);
160    bool setSize(uint32_t w, uint32_t h);
161#ifdef USE_HWC2
162    bool setAlpha(float alpha);
163#else
164    bool setAlpha(uint8_t alpha);
165#endif
166    bool setMatrix(const layer_state_t::matrix22_t& matrix);
167    bool setTransparentRegionHint(const Region& transparent);
168    bool setFlags(uint8_t flags, uint8_t mask);
169    bool setCrop(const Rect& crop, bool immediate);
170    bool setFinalCrop(const Rect& crop);
171    bool setLayerStack(uint32_t layerStack);
172    bool setDataSpace(android_dataspace dataSpace);
173    uint32_t getLayerStack() const;
174    void deferTransactionUntil(const sp<IBinder>& handle, uint64_t frameNumber);
175    bool setOverrideScalingMode(int32_t overrideScalingMode);
176    void setInfo(uint32_t type, uint32_t appId);
177    bool reparentChildren(const sp<IBinder>& layer);
178
179    // If we have received a new buffer this frame, we will pass its surface
180    // damage down to hardware composer. Otherwise, we must send a region with
181    // one empty rect.
182    void useSurfaceDamage();
183    void useEmptyDamage();
184
185    uint32_t getTransactionFlags(uint32_t flags);
186    uint32_t setTransactionFlags(uint32_t flags);
187
188    void computeGeometry(const sp<const DisplayDevice>& hw, Mesh& mesh,
189            bool useIdentityTransform) const;
190    Rect computeBounds(const Region& activeTransparentRegion) const;
191    Rect computeBounds() const;
192
193    int32_t getSequence() const { return sequence; }
194
195    // -----------------------------------------------------------------------
196    // Virtuals
197
198    virtual const char* getTypeId() const { return "Layer"; }
199
200    /*
201     * isOpaque - true if this surface is opaque
202     *
203     * This takes into account the buffer format (i.e. whether or not the
204     * pixel format includes an alpha channel) and the "opaque" flag set
205     * on the layer.  It does not examine the current plane alpha value.
206     */
207    virtual bool isOpaque(const Layer::State& s) const;
208
209    /*
210     * isSecure - true if this surface is secure, that is if it prevents
211     * screenshots or VNC servers.
212     */
213    virtual bool isSecure() const;
214
215    /*
216     * isProtected - true if the layer may contain protected content in the
217     * GRALLOC_USAGE_PROTECTED sense.
218     */
219    virtual bool isProtected() const;
220
221    /*
222     * isVisible - true if this layer is visible, false otherwise
223     */
224    virtual bool isVisible() const;
225
226    /*
227     * isHiddenByPolicy - true if this layer has been forced invisible.
228     * just because this is false, doesn't mean isVisible() is true.
229     * For example if this layer has no active buffer, it may not be hidden by
230     * policy, but it still can not be visible.
231     */
232    virtual bool isHiddenByPolicy() const;
233
234    /*
235     * isFixedSize - true if content has a fixed size
236     */
237    virtual bool isFixedSize() const;
238
239protected:
240    /*
241     * onDraw - draws the surface.
242     */
243    virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip,
244            bool useIdentityTransform) const;
245
246public:
247    // -----------------------------------------------------------------------
248
249#ifdef USE_HWC2
250    void setGeometry(const sp<const DisplayDevice>& displayDevice, uint32_t z);
251    void forceClientComposition(int32_t hwcId);
252    void setPerFrameData(const sp<const DisplayDevice>& displayDevice);
253
254    // callIntoHwc exists so we can update our local state and call
255    // acceptDisplayChanges without unnecessarily updating the device's state
256    void setCompositionType(int32_t hwcId, HWC2::Composition type,
257            bool callIntoHwc = true);
258    HWC2::Composition getCompositionType(int32_t hwcId) const;
259
260    void setClearClientTarget(int32_t hwcId, bool clear);
261    bool getClearClientTarget(int32_t hwcId) const;
262
263    void updateCursorPosition(const sp<const DisplayDevice>& hw);
264#else
265    void setGeometry(const sp<const DisplayDevice>& hw,
266            HWComposer::HWCLayerInterface& layer);
267    void setPerFrameData(const sp<const DisplayDevice>& hw,
268            HWComposer::HWCLayerInterface& layer);
269    void setAcquireFence(const sp<const DisplayDevice>& hw,
270            HWComposer::HWCLayerInterface& layer);
271
272    Rect getPosition(const sp<const DisplayDevice>& hw);
273#endif
274
275    /*
276     * called after page-flip
277     */
278#ifdef USE_HWC2
279    void onLayerDisplayed(const sp<Fence>& releaseFence);
280#else
281    void onLayerDisplayed(const sp<const DisplayDevice>& hw,
282            HWComposer::HWCLayerInterface* layer);
283#endif
284
285    bool shouldPresentNow(const DispSync& dispSync) const;
286
287    /*
288     * called before composition.
289     * returns true if the layer has pending updates.
290     */
291    bool onPreComposition(nsecs_t refreshStartTime);
292
293    /*
294     * called after composition.
295     * returns true if the layer latched a new buffer this frame.
296     */
297    bool onPostComposition(const std::shared_ptr<FenceTime>& glDoneFence,
298            const std::shared_ptr<FenceTime>& presentFence,
299            const std::shared_ptr<FenceTime>& retireFence,
300            const CompositorTiming& compositorTiming);
301
302#ifdef USE_HWC2
303    // If a buffer was replaced this frame, release the former buffer
304    void releasePendingBuffer(nsecs_t dequeueReadyTime);
305#endif
306
307    /*
308     * draw - performs some global clipping optimizations
309     * and calls onDraw().
310     */
311    void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
312    void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const;
313    void draw(const sp<const DisplayDevice>& hw) const;
314
315    /*
316     * doTransaction - process the transaction. This is a good place to figure
317     * out which attributes of the surface have changed.
318     */
319    uint32_t doTransaction(uint32_t transactionFlags);
320
321    /*
322     * setVisibleRegion - called to set the new visible region. This gives
323     * a chance to update the new visible region or record the fact it changed.
324     */
325    void setVisibleRegion(const Region& visibleRegion);
326
327    /*
328     * setCoveredRegion - called when the covered region changes. The covered
329     * region corresponds to any area of the surface that is covered
330     * (transparently or not) by another surface.
331     */
332    void setCoveredRegion(const Region& coveredRegion);
333
334    /*
335     * setVisibleNonTransparentRegion - called when the visible and
336     * non-transparent region changes.
337     */
338    void setVisibleNonTransparentRegion(const Region&
339            visibleNonTransparentRegion);
340
341    /*
342     * latchBuffer - called each time the screen is redrawn and returns whether
343     * the visible regions need to be recomputed (this is a fairly heavy
344     * operation, so this should be set only if needed). Typically this is used
345     * to figure out if the content or size of a surface has changed.
346     */
347    Region latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime);
348
349    bool isPotentialCursor() const { return mPotentialCursor;}
350
351    /*
352     * called with the state lock when the surface is removed from the
353     * current list
354     */
355    void onRemoved();
356
357
358    // Updates the transform hint in our SurfaceFlingerConsumer to match
359    // the current orientation of the display device.
360    void updateTransformHint(const sp<const DisplayDevice>& hw) const;
361
362    /*
363     * returns the rectangle that crops the content of the layer and scales it
364     * to the layer's size.
365     */
366    Rect getContentCrop() const;
367
368    /*
369     * Returns if a frame is queued.
370     */
371    bool hasQueuedFrame() const { return mQueuedFrames > 0 ||
372            mSidebandStreamChanged || mAutoRefresh; }
373
374#ifdef USE_HWC2
375    // -----------------------------------------------------------------------
376
377    void eraseHwcLayer(int32_t hwcId) {
378        mHwcLayers.erase(hwcId);
379
380        Mutex::Autolock lock(mHwcBufferCacheMutex);
381        mHwcBufferCaches.erase(hwcId);
382    }
383
384    bool hasHwcLayer(int32_t hwcId) {
385        if (mHwcLayers.count(hwcId) == 0) {
386            return false;
387        }
388        if (mHwcLayers[hwcId].layer->isAbandoned()) {
389            ALOGI("Erasing abandoned layer %s on %d", mName.string(), hwcId);
390            eraseHwcLayer(hwcId);
391            return false;
392        }
393        return true;
394    }
395
396    std::shared_ptr<HWC2::Layer> getHwcLayer(int32_t hwcId) {
397        if (mHwcLayers.count(hwcId) == 0) {
398            return nullptr;
399        }
400        return mHwcLayers[hwcId].layer;
401    }
402
403    void setHwcLayer(int32_t hwcId, std::shared_ptr<HWC2::Layer>&& layer) {
404        if (layer) {
405            mHwcLayers[hwcId].layer = layer;
406
407            Mutex::Autolock lock(mHwcBufferCacheMutex);
408            mHwcBufferCaches[hwcId] = HWComposerBufferCache();
409        } else {
410            eraseHwcLayer(hwcId);
411        }
412    }
413
414    void clearHwcLayers() {
415        mHwcLayers.clear();
416    }
417
418#endif
419    // -----------------------------------------------------------------------
420
421    void clearWithOpenGL(const sp<const DisplayDevice>& hw) const;
422    void setFiltering(bool filtering);
423    bool getFiltering() const;
424
425    // only for debugging
426    inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
427
428    inline  const State&    getDrawingState() const { return mDrawingState; }
429    inline  const State&    getCurrentState() const { return mCurrentState; }
430    inline  State&          getCurrentState()       { return mCurrentState; }
431
432
433    /* always call base class first */
434    void dump(String8& result, Colorizer& colorizer) const;
435#ifdef USE_HWC2
436    static void miniDumpHeader(String8& result);
437    void miniDump(String8& result, int32_t hwcId) const;
438#endif
439    void dumpFrameStats(String8& result) const;
440    void dumpFrameEvents(String8& result);
441    void clearFrameStats();
442    void logFrameStats();
443    void getFrameStats(FrameStats* outStats) const;
444
445    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
446
447    void onDisconnect();
448    void addAndGetFrameTimestamps(const NewFrameEventsEntry* newEntry,
449            FrameEventHistoryDelta* outDelta);
450
451    bool getTransformToDisplayInverse() const;
452
453    Transform getTransform() const;
454
455    void traverseInReverseZOrder(const std::function<void(Layer*)>& exec);
456    void traverseInZOrder(const std::function<void(Layer*)>& exec);
457
458    void addChild(const sp<Layer>& layer);
459    // Returns index if removed, or negative value otherwise
460    // for symmetry with Vector::remove
461    ssize_t removeChild(const sp<Layer>& layer);
462    sp<Layer> getParent() const { return mParent.promote(); }
463    bool hasParent() const { return getParent() != nullptr; }
464
465    Rect computeScreenBounds(bool reduceTransparentRegion = true) const;
466    bool setChildLayer(const sp<Layer>& childLayer, int32_t z);
467
468    // Copy the current list of children to the drawing state. Called by
469    // SurfaceFlinger to complete a transaction.
470    void commitChildList();
471
472    int32_t getZ() const;
473protected:
474    // constant
475    sp<SurfaceFlinger> mFlinger;
476    /*
477     * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
478     * is called.
479     */
480    class LayerCleaner {
481        sp<SurfaceFlinger> mFlinger;
482        wp<Layer> mLayer;
483    protected:
484        ~LayerCleaner() {
485            // destroy client resources
486            mFlinger->onLayerDestroyed(mLayer);
487        }
488    public:
489        LayerCleaner(const sp<SurfaceFlinger>& flinger,
490                const sp<Layer>& layer)
491            : mFlinger(flinger), mLayer(layer) {
492        }
493    };
494
495
496    virtual void onFirstRef();
497
498
499
500private:
501    friend class SurfaceInterceptor;
502    // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener
503    virtual void onFrameAvailable(const BufferItem& item) override;
504    virtual void onFrameReplaced(const BufferItem& item) override;
505    virtual void onBuffersReleased() 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    };
698    std::unordered_map<int32_t, HWCInfo> mHwcLayers;
699
700    // We need one HWComposerBufferCache for each HWC display.  We cannot have
701    // HWComposerBufferCache in HWCInfo because HWCInfo can only be accessed
702    // from the main thread.
703    Mutex mHwcBufferCacheMutex;
704    std::unordered_map<int32_t, HWComposerBufferCache> mHwcBufferCaches;
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