Layer.h revision 468051e20be19130572231266db306396a56402b 
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 "MonitoredProducer.h"
44#include "SurfaceFlinger.h"
45#include "SurfaceFlingerConsumer.h"
46#include "Transform.h"
47
48#include "DisplayHardware/HWComposer.h"
49#include "DisplayHardware/FloatRect.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        uint32_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        Rect crop;
125        Rect requestedCrop;
126
127        Rect finalCrop;
128
129        // If set, defers this state update until the Layer identified by handle
130        // receives a frame with the given frameNumber
131        sp<IBinder> handle;
132        uint64_t frameNumber;
133
134        // the transparentRegion hint is a bit special, it's latched only
135        // when we receive a buffer -- this is because it's "content"
136        // dependent.
137        Region activeTransparentRegion;
138        Region requestedTransparentRegion;
139    };
140
141    // -----------------------------------------------------------------------
142
143    Layer(SurfaceFlinger* flinger, const sp<Client>& client,
144            const String8& name, uint32_t w, uint32_t h, uint32_t flags);
145
146    virtual ~Layer();
147
148    // the this layer's size and format
149    status_t setBuffers(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags);
150
151    // modify current state
152    bool setPosition(float x, float y, bool immediate);
153    bool setLayer(uint32_t z);
154    bool setSize(uint32_t w, uint32_t h);
155#ifdef USE_HWC2
156    bool setAlpha(float alpha);
157#else
158    bool setAlpha(uint8_t alpha);
159#endif
160    bool setMatrix(const layer_state_t::matrix22_t& matrix);
161    bool setTransparentRegionHint(const Region& transparent);
162    bool setFlags(uint8_t flags, uint8_t mask);
163    bool setCrop(const Rect& crop, bool immediate);
164    bool setFinalCrop(const Rect& crop);
165    bool setLayerStack(uint32_t layerStack);
166    void deferTransactionUntil(const sp<IBinder>& handle, uint64_t frameNumber);
167    bool setOverrideScalingMode(int32_t overrideScalingMode);
168
169    // If we have received a new buffer this frame, we will pass its surface
170    // damage down to hardware composer. Otherwise, we must send a region with
171    // one empty rect.
172    void useSurfaceDamage();
173    void useEmptyDamage();
174
175    uint32_t getTransactionFlags(uint32_t flags);
176    uint32_t setTransactionFlags(uint32_t flags);
177
178    void computeGeometry(const sp<const DisplayDevice>& hw, Mesh& mesh,
179            bool useIdentityTransform) const;
180    Rect computeBounds(const Region& activeTransparentRegion) const;
181    Rect computeBounds() const;
182
183    int32_t getSequence() const { return sequence; }
184
185    // -----------------------------------------------------------------------
186    // Virtuals
187
188    virtual const char* getTypeId() const { return "Layer"; }
189
190    /*
191     * isOpaque - true if this surface is opaque
192     *
193     * This takes into account the buffer format (i.e. whether or not the
194     * pixel format includes an alpha channel) and the "opaque" flag set
195     * on the layer.  It does not examine the current plane alpha value.
196     */
197    virtual bool isOpaque(const Layer::State& s) const;
198
199    /*
200     * isSecure - true if this surface is secure, that is if it prevents
201     * screenshots or VNC servers.
202     */
203    virtual bool isSecure() const;
204
205    /*
206     * isProtected - true if the layer may contain protected content in the
207     * GRALLOC_USAGE_PROTECTED sense.
208     */
209    virtual bool isProtected() const;
210
211    /*
212     * isVisible - true if this layer is visible, false otherwise
213     */
214    virtual bool isVisible() const;
215
216    /*
217     * isFixedSize - true if content has a fixed size
218     */
219    virtual bool isFixedSize() const;
220
221protected:
222    /*
223     * onDraw - draws the surface.
224     */
225    virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip,
226            bool useIdentityTransform) const;
227
228public:
229    // -----------------------------------------------------------------------
230
231#ifdef USE_HWC2
232    void setGeometry(const sp<const DisplayDevice>& displayDevice);
233    void forceClientComposition(int32_t hwcId);
234    void setPerFrameData(const sp<const DisplayDevice>& displayDevice);
235
236    // callIntoHwc exists so we can update our local state and call
237    // acceptDisplayChanges without unnecessarily updating the device's state
238    void setCompositionType(int32_t hwcId, HWC2::Composition type,
239            bool callIntoHwc = true);
240    HWC2::Composition getCompositionType(int32_t hwcId) const;
241
242    void setClearClientTarget(int32_t hwcId, bool clear);
243    bool getClearClientTarget(int32_t hwcId) const;
244
245    void updateCursorPosition(const sp<const DisplayDevice>& hw);
246#else
247    void setGeometry(const sp<const DisplayDevice>& hw,
248            HWComposer::HWCLayerInterface& layer);
249    void setPerFrameData(const sp<const DisplayDevice>& hw,
250            HWComposer::HWCLayerInterface& layer);
251    void setAcquireFence(const sp<const DisplayDevice>& hw,
252            HWComposer::HWCLayerInterface& layer);
253
254    Rect getPosition(const sp<const DisplayDevice>& hw);
255#endif
256
257    /*
258     * called after page-flip
259     */
260#ifdef USE_HWC2
261    void onLayerDisplayed(const sp<Fence>& releaseFence);
262#else
263    void onLayerDisplayed(const sp<const DisplayDevice>& hw,
264            HWComposer::HWCLayerInterface* layer);
265#endif
266
267    bool shouldPresentNow(const DispSync& dispSync) const;
268
269    /*
270     * called before composition.
271     * returns true if the layer has pending updates.
272     */
273    bool onPreComposition();
274
275    /*
276     * called after composition.
277     * returns true if the layer latched a new buffer this frame.
278     */
279    bool onPostComposition();
280
281#ifdef USE_HWC2
282    // If a buffer was replaced this frame, release the former buffer
283    void releasePendingBuffer();
284#endif
285
286    /*
287     * draw - performs some global clipping optimizations
288     * and calls onDraw().
289     */
290    void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
291    void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const;
292    void draw(const sp<const DisplayDevice>& hw) const;
293
294    /*
295     * doTransaction - process the transaction. This is a good place to figure
296     * out which attributes of the surface have changed.
297     */
298    uint32_t doTransaction(uint32_t transactionFlags);
299
300    /*
301     * setVisibleRegion - called to set the new visible region. This gives
302     * a chance to update the new visible region or record the fact it changed.
303     */
304    void setVisibleRegion(const Region& visibleRegion);
305
306    /*
307     * setCoveredRegion - called when the covered region changes. The covered
308     * region corresponds to any area of the surface that is covered
309     * (transparently or not) by another surface.
310     */
311    void setCoveredRegion(const Region& coveredRegion);
312
313    /*
314     * setVisibleNonTransparentRegion - called when the visible and
315     * non-transparent region changes.
316     */
317    void setVisibleNonTransparentRegion(const Region&
318            visibleNonTransparentRegion);
319
320    /*
321     * latchBuffer - called each time the screen is redrawn and returns whether
322     * the visible regions need to be recomputed (this is a fairly heavy
323     * operation, so this should be set only if needed). Typically this is used
324     * to figure out if the content or size of a surface has changed.
325     */
326    Region latchBuffer(bool& recomputeVisibleRegions);
327
328    bool isPotentialCursor() const { return mPotentialCursor;}
329
330    /*
331     * called with the state lock when the surface is removed from the
332     * current list
333     */
334    void onRemoved();
335
336
337    // Updates the transform hint in our SurfaceFlingerConsumer to match
338    // the current orientation of the display device.
339    void updateTransformHint(const sp<const DisplayDevice>& hw) const;
340
341    /*
342     * returns the rectangle that crops the content of the layer and scales it
343     * to the layer's size.
344     */
345    Rect getContentCrop() const;
346
347    /*
348     * Returns if a frame is queued.
349     */
350    bool hasQueuedFrame() const { return mQueuedFrames > 0 ||
351            mSidebandStreamChanged || mAutoRefresh; }
352
353#ifdef USE_HWC2
354    // -----------------------------------------------------------------------
355
356    bool hasHwcLayer(int32_t hwcId) {
357        if (mHwcLayers.count(hwcId) == 0) {
358            return false;
359        }
360        if (mHwcLayers[hwcId].layer->isAbandoned()) {
361            ALOGI("Erasing abandoned layer %s on %d", mName.string(), hwcId);
362            mHwcLayers.erase(hwcId);
363            return false;
364        }
365        return true;
366    }
367
368    std::shared_ptr<HWC2::Layer> getHwcLayer(int32_t hwcId) {
369        if (mHwcLayers.count(hwcId) == 0) {
370            return nullptr;
371        }
372        return mHwcLayers[hwcId].layer;
373    }
374
375    void setHwcLayer(int32_t hwcId, std::shared_ptr<HWC2::Layer>&& layer) {
376        if (layer) {
377            mHwcLayers[hwcId].layer = layer;
378        } else {
379            mHwcLayers.erase(hwcId);
380        }
381    }
382
383#endif
384    // -----------------------------------------------------------------------
385
386    void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip) const;
387    void setFiltering(bool filtering);
388    bool getFiltering() const;
389
390    // only for debugging
391    inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
392
393    inline  const State&    getDrawingState() const { return mDrawingState; }
394    inline  const State&    getCurrentState() const { return mCurrentState; }
395    inline  State&          getCurrentState()       { return mCurrentState; }
396
397
398    /* always call base class first */
399    void dump(String8& result, Colorizer& colorizer) const;
400    void dumpFrameStats(String8& result) const;
401    void clearFrameStats();
402    void logFrameStats();
403    void getFrameStats(FrameStats* outStats) const;
404
405    void getFenceData(String8* outName, uint64_t* outFrameNumber,
406            bool* outIsGlesComposition, nsecs_t* outPostedTime,
407            sp<Fence>* outAcquireFence, sp<Fence>* outPrevReleaseFence) const;
408
409    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
410
411    bool getFrameTimestamps(uint64_t frameNumber,
412            FrameTimestamps* outTimestamps) const {
413        return mFlinger->getFrameTimestamps(*this, frameNumber, outTimestamps);
414    }
415
416    bool getTransformToDisplayInverse() const;
417
418protected:
419    // constant
420    sp<SurfaceFlinger> mFlinger;
421    /*
422     * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
423     * is called.
424     */
425    class LayerCleaner {
426        sp<SurfaceFlinger> mFlinger;
427        wp<Layer> mLayer;
428    protected:
429        ~LayerCleaner() {
430            // destroy client resources
431            mFlinger->onLayerDestroyed(mLayer);
432        }
433    public:
434        LayerCleaner(const sp<SurfaceFlinger>& flinger,
435                const sp<Layer>& layer)
436            : mFlinger(flinger), mLayer(layer) {
437        }
438    };
439
440
441    virtual void onFirstRef();
442
443
444
445private:
446    friend class SurfaceInterceptor;
447    // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener
448    virtual void onFrameAvailable(const BufferItem& item) override;
449    virtual void onFrameReplaced(const BufferItem& item) override;
450    virtual void onSidebandStreamChanged() override;
451
452    void commitTransaction(const State& stateToCommit);
453
454    // needsLinearFiltering - true if this surface's state requires filtering
455    bool needsFiltering(const sp<const DisplayDevice>& hw) const;
456
457    uint32_t getEffectiveUsage(uint32_t usage) const;
458    FloatRect computeCrop(const sp<const DisplayDevice>& hw) const;
459    bool isCropped() const;
460    static bool getOpacityForFormat(uint32_t format);
461
462    // drawing
463    void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip,
464            float r, float g, float b, float alpha) const;
465    void drawWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip,
466            bool useIdentityTransform) const;
467
468    // Temporary - Used only for LEGACY camera mode.
469    uint32_t getProducerStickyTransform() const;
470
471    // Loads the corresponding system property once per process
472    static bool latchUnsignaledBuffers();
473
474    // -----------------------------------------------------------------------
475
476    class SyncPoint
477    {
478    public:
479        SyncPoint(uint64_t frameNumber) : mFrameNumber(frameNumber),
480                mFrameIsAvailable(false), mTransactionIsApplied(false) {}
481
482        uint64_t getFrameNumber() const {
483            return mFrameNumber;
484        }
485
486        bool frameIsAvailable() const {
487            return mFrameIsAvailable;
488        }
489
490        void setFrameAvailable() {
491            mFrameIsAvailable = true;
492        }
493
494        bool transactionIsApplied() const {
495            return mTransactionIsApplied;
496        }
497
498        void setTransactionApplied() {
499            mTransactionIsApplied = true;
500        }
501
502    private:
503        const uint64_t mFrameNumber;
504        std::atomic<bool> mFrameIsAvailable;
505        std::atomic<bool> mTransactionIsApplied;
506    };
507
508    // SyncPoints which will be signaled when the correct frame is at the head
509    // of the queue and dropped after the frame has been latched. Protected by
510    // mLocalSyncPointMutex.
511    Mutex mLocalSyncPointMutex;
512    std::list<std::shared_ptr<SyncPoint>> mLocalSyncPoints;
513
514    // SyncPoints which will be signaled and then dropped when the transaction
515    // is applied
516    std::list<std::shared_ptr<SyncPoint>> mRemoteSyncPoints;
517
518    uint64_t getHeadFrameNumber() const;
519    bool headFenceHasSignaled() const;
520
521    // Returns false if the relevant frame has already been latched
522    bool addSyncPoint(const std::shared_ptr<SyncPoint>& point);
523
524    void pushPendingState();
525    void popPendingState(State* stateToCommit);
526    bool applyPendingStates(State* stateToCommit);
527
528    // Returns mCurrentScaling mode (originating from the
529    // Client) or mOverrideScalingMode mode (originating from
530    // the Surface Controller) if set.
531    uint32_t getEffectiveScalingMode() const;
532public:
533    /*
534     * The layer handle is just a BBinder object passed to the client
535     * (remote process) -- we don't keep any reference on our side such that
536     * the dtor is called when the remote side let go of its reference.
537     *
538     * LayerCleaner ensures that mFlinger->onLayerDestroyed() is called for
539     * this layer when the handle is destroyed.
540     */
541    class Handle : public BBinder, public LayerCleaner {
542        public:
543            Handle(const sp<SurfaceFlinger>& flinger, const sp<Layer>& layer)
544                : LayerCleaner(flinger, layer), owner(layer) {}
545
546            wp<Layer> owner;
547    };
548
549    sp<IBinder> getHandle();
550    sp<IGraphicBufferProducer> getProducer() const;
551    const String8& getName() const;
552    void notifyAvailableFrames();
553private:
554
555    // -----------------------------------------------------------------------
556
557    // constants
558    sp<SurfaceFlingerConsumer> mSurfaceFlingerConsumer;
559    sp<IGraphicBufferProducer> mProducer;
560    uint32_t mTextureName;      // from GLES
561    bool mPremultipliedAlpha;
562    String8 mName;
563    PixelFormat mFormat;
564
565    // these are protected by an external lock
566    State mCurrentState;
567    State mDrawingState;
568    volatile int32_t mTransactionFlags;
569
570    // Accessed from main thread and binder threads
571    Mutex mPendingStateMutex;
572    Vector<State> mPendingStates;
573
574    // thread-safe
575    volatile int32_t mQueuedFrames;
576    volatile int32_t mSidebandStreamChanged; // used like an atomic boolean
577    FrameTracker mFrameTracker;
578
579    // main thread
580    sp<GraphicBuffer> mActiveBuffer;
581    sp<NativeHandle> mSidebandStream;
582    Rect mCurrentCrop;
583    uint32_t mCurrentTransform;
584    uint32_t mCurrentScalingMode;
585    // We encode unset as -1.
586    int32_t mOverrideScalingMode;
587    bool mCurrentOpacity;
588    std::atomic<uint64_t> mCurrentFrameNumber;
589    bool mRefreshPending;
590    bool mFrameLatencyNeeded;
591    // Whether filtering is forced on or not
592    bool mFiltering;
593    // Whether filtering is needed b/c of the drawingstate
594    bool mNeedsFiltering;
595    // The mesh used to draw the layer in GLES composition mode
596    mutable Mesh mMesh;
597    // The texture used to draw the layer in GLES composition mode
598    mutable Texture mTexture;
599
600#ifdef USE_HWC2
601    // HWC items, accessed from the main thread
602    struct HWCInfo {
603        HWCInfo()
604          : layer(),
605            forceClientComposition(false),
606            compositionType(HWC2::Composition::Invalid),
607            clearClientTarget(false) {}
608
609        std::shared_ptr<HWC2::Layer> layer;
610        bool forceClientComposition;
611        HWC2::Composition compositionType;
612        bool clearClientTarget;
613    };
614    std::unordered_map<int32_t, HWCInfo> mHwcLayers;
615#else
616    bool mIsGlesComposition;
617#endif
618
619    // page-flip thread (currently main thread)
620    bool mProtectedByApp; // application requires protected path to external sink
621
622    // protected by mLock
623    mutable Mutex mLock;
624    // Set to true once we've returned this surface's handle
625    mutable bool mHasSurface;
626    const wp<Client> mClientRef;
627
628    // This layer can be a cursor on some displays.
629    bool mPotentialCursor;
630
631    // Local copy of the queued contents of the incoming BufferQueue
632    mutable Mutex mQueueItemLock;
633    Condition mQueueItemCondition;
634    Vector<BufferItem> mQueueItems;
635    std::atomic<uint64_t> mLastFrameNumberReceived;
636    bool mUpdateTexImageFailed; // This is only modified from the main thread
637
638    bool mAutoRefresh;
639    bool mFreezePositionUpdates;
640};
641
642// ---------------------------------------------------------------------------
643
644}; // namespace android
645
646#endif // ANDROID_LAYER_H
647