Layer.h revision 4afbf41da18937466ed87da5ccdcb6cf13622709 
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
113        // The identifier of the layer stack this layer belongs to. A layer can
114        // only be associated to a single layer stack. A layer stack is a
115        // z-ordered group of layers which can be associated to one or more
116        // displays. Using the same layer stack on different displays is a way
117        // to achieve mirroring.
118        uint32_t layerStack;
119
120#ifdef USE_HWC2
121        float alpha;
122#else
123        uint8_t alpha;
124#endif
125        uint8_t flags;
126        uint8_t mask;
127        uint8_t reserved[2];
128        int32_t sequence; // changes when visible regions can change
129        bool modified;
130
131        // Crop is expressed in layer space coordinate.
132        Rect crop;
133        Rect requestedCrop;
134
135        // finalCrop is expressed in display space coordinate.
136        Rect finalCrop;
137
138        // If set, defers this state update until the identified Layer
139        // receives a frame with the given frameNumber
140        wp<Layer> barrierLayer;
141        uint64_t frameNumber;
142
143        // the transparentRegion hint is a bit special, it's latched only
144        // when we receive a buffer -- this is because it's "content"
145        // dependent.
146        Region activeTransparentRegion;
147        Region requestedTransparentRegion;
148        android_dataspace dataSpace;
149
150        uint32_t appId;
151        uint32_t type;
152    };
153
154    // -----------------------------------------------------------------------
155
156    Layer(SurfaceFlinger* flinger, const sp<Client>& client,
157            const String8& name, uint32_t w, uint32_t h, uint32_t flags);
158
159    virtual ~Layer();
160
161    // the this layer's size and format
162    status_t setBuffers(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags);
163
164    // modify current state
165    bool setPosition(float x, float y, bool immediate);
166    bool setLayer(int32_t z);
167    bool setSize(uint32_t w, uint32_t h);
168#ifdef USE_HWC2
169    bool setAlpha(float alpha);
170#else
171    bool setAlpha(uint8_t alpha);
172#endif
173    bool setMatrix(const layer_state_t::matrix22_t& matrix);
174    bool setTransparentRegionHint(const Region& transparent);
175    bool setFlags(uint8_t flags, uint8_t mask);
176    bool setCrop(const Rect& crop, bool immediate);
177    bool setFinalCrop(const Rect& crop);
178    bool setLayerStack(uint32_t layerStack);
179    bool setDataSpace(android_dataspace dataSpace);
180    uint32_t getLayerStack() const;
181    void deferTransactionUntil(const sp<IBinder>& barrierHandle, uint64_t frameNumber);
182    void deferTransactionUntil(const sp<Layer>& barrierLayer, uint64_t frameNumber);
183    bool setOverrideScalingMode(int32_t overrideScalingMode);
184    void setInfo(uint32_t type, uint32_t appId);
185    bool reparentChildren(const sp<IBinder>& layer);
186    bool detachChildren();
187
188    // If we have received a new buffer this frame, we will pass its surface
189    // damage down to hardware composer. Otherwise, we must send a region with
190    // one empty rect.
191    void useSurfaceDamage();
192    void useEmptyDamage();
193
194    uint32_t getTransactionFlags(uint32_t flags);
195    uint32_t setTransactionFlags(uint32_t flags);
196
197    void computeGeometry(const sp<const DisplayDevice>& hw, Mesh& mesh,
198            bool useIdentityTransform) const;
199    Rect computeBounds(const Region& activeTransparentRegion) const;
200    Rect computeBounds() const;
201
202    int32_t getSequence() const { return sequence; }
203
204    // -----------------------------------------------------------------------
205    // Virtuals
206
207    virtual const char* getTypeId() const { return "Layer"; }
208
209    /*
210     * isOpaque - true if this surface is opaque
211     *
212     * This takes into account the buffer format (i.e. whether or not the
213     * pixel format includes an alpha channel) and the "opaque" flag set
214     * on the layer.  It does not examine the current plane alpha value.
215     */
216    virtual bool isOpaque(const Layer::State& s) const;
217
218    /*
219     * isSecure - true if this surface is secure, that is if it prevents
220     * screenshots or VNC servers.
221     */
222    virtual bool isSecure() const;
223
224    /*
225     * isProtected - true if the layer may contain protected content in the
226     * GRALLOC_USAGE_PROTECTED sense.
227     */
228    virtual bool isProtected() const;
229
230    /*
231     * isVisible - true if this layer is visible, false otherwise
232     */
233    virtual bool isVisible() const;
234
235    /*
236     * isHiddenByPolicy - true if this layer has been forced invisible.
237     * just because this is false, doesn't mean isVisible() is true.
238     * For example if this layer has no active buffer, it may not be hidden by
239     * policy, but it still can not be visible.
240     */
241    virtual bool isHiddenByPolicy() const;
242
243    /*
244     * isFixedSize - true if content has a fixed size
245     */
246    virtual bool isFixedSize() const;
247
248protected:
249    /*
250     * onDraw - draws the surface.
251     */
252    virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip,
253            bool useIdentityTransform) const;
254
255public:
256    // -----------------------------------------------------------------------
257
258#ifdef USE_HWC2
259    void setGeometry(const sp<const DisplayDevice>& displayDevice, uint32_t z);
260    void forceClientComposition(int32_t hwcId);
261    void setPerFrameData(const sp<const DisplayDevice>& displayDevice);
262
263    // callIntoHwc exists so we can update our local state and call
264    // acceptDisplayChanges without unnecessarily updating the device's state
265    void setCompositionType(int32_t hwcId, HWC2::Composition type,
266            bool callIntoHwc = true);
267    HWC2::Composition getCompositionType(int32_t hwcId) const;
268
269    void setClearClientTarget(int32_t hwcId, bool clear);
270    bool getClearClientTarget(int32_t hwcId) const;
271
272    void updateCursorPosition(const sp<const DisplayDevice>& hw);
273#else
274    void setGeometry(const sp<const DisplayDevice>& hw,
275            HWComposer::HWCLayerInterface& layer);
276    void setPerFrameData(const sp<const DisplayDevice>& hw,
277            HWComposer::HWCLayerInterface& layer);
278    void setAcquireFence(const sp<const DisplayDevice>& hw,
279            HWComposer::HWCLayerInterface& layer);
280
281    Rect getPosition(const sp<const DisplayDevice>& hw);
282#endif
283
284    /*
285     * called after page-flip
286     */
287#ifdef USE_HWC2
288    void onLayerDisplayed(const sp<Fence>& releaseFence);
289#else
290    void onLayerDisplayed(const sp<const DisplayDevice>& hw,
291            HWComposer::HWCLayerInterface* layer);
292#endif
293
294    bool shouldPresentNow(const DispSync& dispSync) const;
295
296    /*
297     * called before composition.
298     * returns true if the layer has pending updates.
299     */
300    bool onPreComposition(nsecs_t refreshStartTime);
301
302    /*
303     * called after composition.
304     * returns true if the layer latched a new buffer this frame.
305     */
306    bool onPostComposition(const std::shared_ptr<FenceTime>& glDoneFence,
307            const std::shared_ptr<FenceTime>& presentFence,
308            const std::shared_ptr<FenceTime>& retireFence,
309            const CompositorTiming& compositorTiming);
310
311#ifdef USE_HWC2
312    // If a buffer was replaced this frame, release the former buffer
313    void releasePendingBuffer(nsecs_t dequeueReadyTime);
314#endif
315
316    /*
317     * draw - performs some global clipping optimizations
318     * and calls onDraw().
319     */
320    void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
321    void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const;
322    void draw(const sp<const DisplayDevice>& hw) const;
323
324    /*
325     * doTransaction - process the transaction. This is a good place to figure
326     * out which attributes of the surface have changed.
327     */
328    uint32_t doTransaction(uint32_t transactionFlags);
329
330    /*
331     * setVisibleRegion - called to set the new visible region. This gives
332     * a chance to update the new visible region or record the fact it changed.
333     */
334    void setVisibleRegion(const Region& visibleRegion);
335
336    /*
337     * setCoveredRegion - called when the covered region changes. The covered
338     * region corresponds to any area of the surface that is covered
339     * (transparently or not) by another surface.
340     */
341    void setCoveredRegion(const Region& coveredRegion);
342
343    /*
344     * setVisibleNonTransparentRegion - called when the visible and
345     * non-transparent region changes.
346     */
347    void setVisibleNonTransparentRegion(const Region&
348            visibleNonTransparentRegion);
349
350    /*
351     * latchBuffer - called each time the screen is redrawn and returns whether
352     * the visible regions need to be recomputed (this is a fairly heavy
353     * operation, so this should be set only if needed). Typically this is used
354     * to figure out if the content or size of a surface has changed.
355     */
356    Region latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime);
357
358    bool isPotentialCursor() const { return mPotentialCursor;}
359
360    /*
361     * called with the state lock when the surface is removed from the
362     * current list
363     */
364    void onRemoved();
365
366
367    // Updates the transform hint in our SurfaceFlingerConsumer to match
368    // the current orientation of the display device.
369    void updateTransformHint(const sp<const DisplayDevice>& hw) const;
370
371    /*
372     * returns the rectangle that crops the content of the layer and scales it
373     * to the layer's size.
374     */
375    Rect getContentCrop() const;
376
377    /*
378     * Returns if a frame is queued.
379     */
380    bool hasQueuedFrame() const { return mQueuedFrames > 0 ||
381            mSidebandStreamChanged || mAutoRefresh; }
382
383#ifdef USE_HWC2
384    // -----------------------------------------------------------------------
385
386    void eraseHwcLayer(int32_t hwcId) {
387        mHwcLayers.erase(hwcId);
388
389        Mutex::Autolock lock(mHwcBufferCacheMutex);
390        mHwcBufferCaches.erase(hwcId);
391    }
392
393    bool hasHwcLayer(int32_t hwcId) {
394        if (mHwcLayers.count(hwcId) == 0) {
395            return false;
396        }
397        if (mHwcLayers[hwcId].layer->isAbandoned()) {
398            ALOGI("Erasing abandoned layer %s on %d", mName.string(), hwcId);
399            eraseHwcLayer(hwcId);
400            return false;
401        }
402        return true;
403    }
404
405    std::shared_ptr<HWC2::Layer> getHwcLayer(int32_t hwcId) {
406        if (mHwcLayers.count(hwcId) == 0) {
407            return nullptr;
408        }
409        return mHwcLayers[hwcId].layer;
410    }
411
412    void setHwcLayer(int32_t hwcId, std::shared_ptr<HWC2::Layer>&& layer) {
413        if (layer) {
414            mHwcLayers[hwcId].layer = layer;
415
416            Mutex::Autolock lock(mHwcBufferCacheMutex);
417            mHwcBufferCaches[hwcId] = HWComposerBufferCache();
418        } else {
419            eraseHwcLayer(hwcId);
420        }
421    }
422
423    void clearHwcLayers() {
424        mHwcLayers.clear();
425    }
426
427#endif
428    // -----------------------------------------------------------------------
429
430    void clearWithOpenGL(const sp<const DisplayDevice>& hw) const;
431    void setFiltering(bool filtering);
432    bool getFiltering() const;
433
434    // only for debugging
435    inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
436
437    inline  const State&    getDrawingState() const { return mDrawingState; }
438    inline  const State&    getCurrentState() const { return mCurrentState; }
439    inline  State&          getCurrentState()       { return mCurrentState; }
440
441
442    /* always call base class first */
443    void dump(String8& result, Colorizer& colorizer) const;
444#ifdef USE_HWC2
445    static void miniDumpHeader(String8& result);
446    void miniDump(String8& result, int32_t hwcId) const;
447#endif
448    void dumpFrameStats(String8& result) const;
449    void dumpFrameEvents(String8& result);
450    void clearFrameStats();
451    void logFrameStats();
452    void getFrameStats(FrameStats* outStats) const;
453
454    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
455
456    void onDisconnect();
457    void addAndGetFrameTimestamps(const NewFrameEventsEntry* newEntry,
458            FrameEventHistoryDelta* outDelta);
459
460    bool getTransformToDisplayInverse() const;
461
462    Transform getTransform() const;
463
464    void traverseInReverseZOrder(const std::function<void(Layer*)>& exec);
465    void traverseInZOrder(const std::function<void(Layer*)>& exec);
466
467    void addChild(const sp<Layer>& layer);
468    // Returns index if removed, or negative value otherwise
469    // for symmetry with Vector::remove
470    ssize_t removeChild(const sp<Layer>& layer);
471    sp<Layer> getParent() const { return mParent.promote(); }
472    bool hasParent() const { return getParent() != nullptr; }
473
474    Rect computeScreenBounds(bool reduceTransparentRegion = true) const;
475    bool setChildLayer(const sp<Layer>& childLayer, int32_t z);
476
477    // Copy the current list of children to the drawing state. Called by
478    // SurfaceFlinger to complete a transaction.
479    void commitChildList();
480
481    int32_t getZ() const;
482protected:
483    // constant
484    sp<SurfaceFlinger> mFlinger;
485    /*
486     * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
487     * is called.
488     */
489    class LayerCleaner {
490        sp<SurfaceFlinger> mFlinger;
491        wp<Layer> mLayer;
492    protected:
493        ~LayerCleaner() {
494            // destroy client resources
495            mFlinger->onLayerDestroyed(mLayer);
496        }
497    public:
498        LayerCleaner(const sp<SurfaceFlinger>& flinger,
499                const sp<Layer>& layer)
500            : mFlinger(flinger), mLayer(layer) {
501        }
502    };
503
504
505    virtual void onFirstRef();
506
507
508
509private:
510    friend class SurfaceInterceptor;
511    // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener
512    virtual void onFrameAvailable(const BufferItem& item) override;
513    virtual void onFrameReplaced(const BufferItem& item) override;
514    virtual void onBuffersReleased() override;
515    virtual void onSidebandStreamChanged() override;
516
517    void commitTransaction(const State& stateToCommit);
518
519    // needsLinearFiltering - true if this surface's state requires filtering
520    bool needsFiltering(const sp<const DisplayDevice>& hw) const;
521
522    uint32_t getEffectiveUsage(uint32_t usage) const;
523
524    FloatRect computeCrop(const sp<const DisplayDevice>& hw) const;
525    // Compute the initial crop as specified by parent layers and the SurfaceControl
526    // for this layer. Does not include buffer crop from the IGraphicBufferProducer
527    // client, as that should not affect child clipping. Returns in screen space.
528    Rect computeInitialCrop(const sp<const DisplayDevice>& hw) const;
529    bool isCropped() const;
530    static bool getOpacityForFormat(uint32_t format);
531
532    // drawing
533    void clearWithOpenGL(const sp<const DisplayDevice>& hw,
534            float r, float g, float b, float alpha) const;
535    void drawWithOpenGL(const sp<const DisplayDevice>& hw,
536            bool useIdentityTransform) const;
537
538    // Temporary - Used only for LEGACY camera mode.
539    uint32_t getProducerStickyTransform() const;
540
541    // Loads the corresponding system property once per process
542    static bool latchUnsignaledBuffers();
543
544    void setParent(const sp<Layer>& layer);
545
546    // -----------------------------------------------------------------------
547
548    class SyncPoint
549    {
550    public:
551        explicit SyncPoint(uint64_t frameNumber) : mFrameNumber(frameNumber),
552                mFrameIsAvailable(false), mTransactionIsApplied(false) {}
553
554        uint64_t getFrameNumber() const {
555            return mFrameNumber;
556        }
557
558        bool frameIsAvailable() const {
559            return mFrameIsAvailable;
560        }
561
562        void setFrameAvailable() {
563            mFrameIsAvailable = true;
564        }
565
566        bool transactionIsApplied() const {
567            return mTransactionIsApplied;
568        }
569
570        void setTransactionApplied() {
571            mTransactionIsApplied = true;
572        }
573
574    private:
575        const uint64_t mFrameNumber;
576        std::atomic<bool> mFrameIsAvailable;
577        std::atomic<bool> mTransactionIsApplied;
578    };
579
580    // SyncPoints which will be signaled when the correct frame is at the head
581    // of the queue and dropped after the frame has been latched. Protected by
582    // mLocalSyncPointMutex.
583    Mutex mLocalSyncPointMutex;
584    std::list<std::shared_ptr<SyncPoint>> mLocalSyncPoints;
585
586    // SyncPoints which will be signaled and then dropped when the transaction
587    // is applied
588    std::list<std::shared_ptr<SyncPoint>> mRemoteSyncPoints;
589
590    uint64_t getHeadFrameNumber() const;
591    bool headFenceHasSignaled() const;
592
593    // Returns false if the relevant frame has already been latched
594    bool addSyncPoint(const std::shared_ptr<SyncPoint>& point);
595
596    void pushPendingState();
597    void popPendingState(State* stateToCommit);
598    bool applyPendingStates(State* stateToCommit);
599
600    void clearSyncPoints();
601
602    // Returns mCurrentScaling mode (originating from the
603    // Client) or mOverrideScalingMode mode (originating from
604    // the Surface Controller) if set.
605    uint32_t getEffectiveScalingMode() const;
606public:
607    /*
608     * The layer handle is just a BBinder object passed to the client
609     * (remote process) -- we don't keep any reference on our side such that
610     * the dtor is called when the remote side let go of its reference.
611     *
612     * LayerCleaner ensures that mFlinger->onLayerDestroyed() is called for
613     * this layer when the handle is destroyed.
614     */
615    class Handle : public BBinder, public LayerCleaner {
616        public:
617            Handle(const sp<SurfaceFlinger>& flinger, const sp<Layer>& layer)
618                : LayerCleaner(flinger, layer), owner(layer) {}
619
620            wp<Layer> owner;
621    };
622
623    sp<IBinder> getHandle();
624    sp<IGraphicBufferProducer> getProducer() const;
625    const String8& getName() const;
626    void notifyAvailableFrames();
627private:
628
629    // -----------------------------------------------------------------------
630
631    // Check all of the local sync points to ensure that all transactions
632    // which need to have been applied prior to the frame which is about to
633    // be latched have signaled
634    bool allTransactionsSignaled();
635
636    // constants
637    sp<SurfaceFlingerConsumer> mSurfaceFlingerConsumer;
638    sp<IGraphicBufferProducer> mProducer;
639    uint32_t mTextureName;      // from GLES
640    bool mPremultipliedAlpha;
641    String8 mName;
642    PixelFormat mFormat;
643
644    // these are protected by an external lock
645    State mCurrentState;
646    State mDrawingState;
647    volatile int32_t mTransactionFlags;
648
649    // Accessed from main thread and binder threads
650    Mutex mPendingStateMutex;
651    Vector<State> mPendingStates;
652
653    // thread-safe
654    volatile int32_t mQueuedFrames;
655    volatile int32_t mSidebandStreamChanged; // used like an atomic boolean
656
657    // Timestamp history for UIAutomation. Thread safe.
658    FrameTracker mFrameTracker;
659
660    // Timestamp history for the consumer to query.
661    // Accessed by both consumer and producer on main and binder threads.
662    Mutex mFrameEventHistoryMutex;
663    ConsumerFrameEventHistory mFrameEventHistory;
664    FenceTimeline mAcquireTimeline;
665    FenceTimeline mReleaseTimeline;
666
667    // main thread
668    int mActiveBufferSlot;
669    sp<GraphicBuffer> mActiveBuffer;
670    sp<NativeHandle> mSidebandStream;
671    Rect mCurrentCrop;
672    uint32_t mCurrentTransform;
673    uint32_t mCurrentScalingMode;
674    // We encode unset as -1.
675    int32_t mOverrideScalingMode;
676    bool mCurrentOpacity;
677    bool mBufferLatched = false;  // TODO: Use mActiveBuffer?
678    std::atomic<uint64_t> mCurrentFrameNumber;
679    uint64_t mPreviousFrameNumber; // Only accessed on the main thread.
680    bool mRefreshPending;
681    bool mFrameLatencyNeeded;
682    // Whether filtering is forced on or not
683    bool mFiltering;
684    // Whether filtering is needed b/c of the drawingstate
685    bool mNeedsFiltering;
686    // The mesh used to draw the layer in GLES composition mode
687    mutable Mesh mMesh;
688    // The texture used to draw the layer in GLES composition mode
689    mutable Texture mTexture;
690
691#ifdef USE_HWC2
692    // HWC items, accessed from the main thread
693    struct HWCInfo {
694        HWCInfo()
695          : layer(),
696            forceClientComposition(false),
697            compositionType(HWC2::Composition::Invalid),
698            clearClientTarget(false) {}
699
700        std::shared_ptr<HWC2::Layer> layer;
701        bool forceClientComposition;
702        HWC2::Composition compositionType;
703        bool clearClientTarget;
704        Rect displayFrame;
705        FloatRect sourceCrop;
706    };
707
708    // A layer can be attached to multiple displays when operating in mirror mode
709    // (a.k.a: when several displays are attached with equal layerStack). In this
710    // case we need to keep track. In non-mirror mode, a layer will have only one
711    // HWCInfo. This map key is a display layerStack.
712    std::unordered_map<int32_t, HWCInfo> mHwcLayers;
713
714    // We need one HWComposerBufferCache for each HWC display.  We cannot have
715    // HWComposerBufferCache in HWCInfo because HWCInfo can only be accessed
716    // from the main thread.
717    Mutex mHwcBufferCacheMutex;
718    std::unordered_map<int32_t, HWComposerBufferCache> mHwcBufferCaches;
719#else
720    bool mIsGlesComposition;
721#endif
722
723    // page-flip thread (currently main thread)
724    bool mProtectedByApp; // application requires protected path to external sink
725
726    // protected by mLock
727    mutable Mutex mLock;
728    // Set to true once we've returned this surface's handle
729    mutable bool mHasSurface;
730    const wp<Client> mClientRef;
731
732    // This layer can be a cursor on some displays.
733    bool mPotentialCursor;
734
735    // Local copy of the queued contents of the incoming BufferQueue
736    mutable Mutex mQueueItemLock;
737    Condition mQueueItemCondition;
738    Vector<BufferItem> mQueueItems;
739    std::atomic<uint64_t> mLastFrameNumberReceived;
740    bool mUpdateTexImageFailed; // This is only accessed on the main thread.
741
742    bool mAutoRefresh;
743    bool mFreezePositionUpdates;
744
745    // Child list about to be committed/used for editing.
746    LayerVector mCurrentChildren;
747    // Child list used for rendering.
748    LayerVector mDrawingChildren;
749
750    wp<Layer> mParent;
751};
752
753// ---------------------------------------------------------------------------
754
755}; // namespace android
756
757#endif // ANDROID_LAYER_H
758