Layer.h revision c5da271eec001da9e11a2786f2618a45257439c3 
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    class Handle;
184    sp<IBinder> getHandle();
185    sp<IGraphicBufferProducer> getProducer() const;
186    const String8& getName() const;
187
188    int32_t getSequence() const { return sequence; }
189
190    // -----------------------------------------------------------------------
191    // Virtuals
192
193    virtual const char* getTypeId() const { return "Layer"; }
194
195    /*
196     * isOpaque - true if this surface is opaque
197     *
198     * This takes into account the buffer format (i.e. whether or not the
199     * pixel format includes an alpha channel) and the "opaque" flag set
200     * on the layer.  It does not examine the current plane alpha value.
201     */
202    virtual bool isOpaque(const Layer::State& s) const;
203
204    /*
205     * isSecure - true if this surface is secure, that is if it prevents
206     * screenshots or VNC servers.
207     */
208    virtual bool isSecure() const;
209
210    /*
211     * isProtected - true if the layer may contain protected content in the
212     * GRALLOC_USAGE_PROTECTED sense.
213     */
214    virtual bool isProtected() const;
215
216    /*
217     * isVisible - true if this layer is visible, false otherwise
218     */
219    virtual bool isVisible() const;
220
221    /*
222     * isFixedSize - true if content has a fixed size
223     */
224    virtual bool isFixedSize() const;
225
226protected:
227    /*
228     * onDraw - draws the surface.
229     */
230    virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip,
231            bool useIdentityTransform) const;
232
233public:
234    // -----------------------------------------------------------------------
235
236#ifdef USE_HWC2
237    void setGeometry(const sp<const DisplayDevice>& displayDevice);
238    void forceClientComposition(int32_t hwcId);
239    void setPerFrameData(const sp<const DisplayDevice>& displayDevice);
240
241    // callIntoHwc exists so we can update our local state and call
242    // acceptDisplayChanges without unnecessarily updating the device's state
243    void setCompositionType(int32_t hwcId, HWC2::Composition type,
244            bool callIntoHwc = true);
245    HWC2::Composition getCompositionType(int32_t hwcId) const;
246
247    void setClearClientTarget(int32_t hwcId, bool clear);
248    bool getClearClientTarget(int32_t hwcId) const;
249
250    void updateCursorPosition(const sp<const DisplayDevice>& hw);
251#else
252    void setGeometry(const sp<const DisplayDevice>& hw,
253            HWComposer::HWCLayerInterface& layer);
254    void setPerFrameData(const sp<const DisplayDevice>& hw,
255            HWComposer::HWCLayerInterface& layer);
256    void setAcquireFence(const sp<const DisplayDevice>& hw,
257            HWComposer::HWCLayerInterface& layer);
258
259    Rect getPosition(const sp<const DisplayDevice>& hw);
260#endif
261
262    /*
263     * called after page-flip
264     */
265#ifdef USE_HWC2
266    void onLayerDisplayed(const sp<Fence>& releaseFence);
267#else
268    void onLayerDisplayed(const sp<const DisplayDevice>& hw,
269            HWComposer::HWCLayerInterface* layer);
270#endif
271
272    bool shouldPresentNow(const DispSync& dispSync) const;
273
274    /*
275     * called before composition.
276     * returns true if the layer has pending updates.
277     */
278    bool onPreComposition();
279
280    /*
281     * called after composition.
282     * returns true if the layer latched a new buffer this frame.
283     */
284    bool onPostComposition();
285
286#ifdef USE_HWC2
287    // If a buffer was replaced this frame, release the former buffer
288    void releasePendingBuffer();
289#endif
290
291    /*
292     * draw - performs some global clipping optimizations
293     * and calls onDraw().
294     */
295    void draw(const sp<const DisplayDevice>& hw, const Region& clip) const;
296    void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const;
297    void draw(const sp<const DisplayDevice>& hw) const;
298
299    /*
300     * doTransaction - process the transaction. This is a good place to figure
301     * out which attributes of the surface have changed.
302     */
303    uint32_t doTransaction(uint32_t transactionFlags);
304
305    /*
306     * setVisibleRegion - called to set the new visible region. This gives
307     * a chance to update the new visible region or record the fact it changed.
308     */
309    void setVisibleRegion(const Region& visibleRegion);
310
311    /*
312     * setCoveredRegion - called when the covered region changes. The covered
313     * region corresponds to any area of the surface that is covered
314     * (transparently or not) by another surface.
315     */
316    void setCoveredRegion(const Region& coveredRegion);
317
318    /*
319     * setVisibleNonTransparentRegion - called when the visible and
320     * non-transparent region changes.
321     */
322    void setVisibleNonTransparentRegion(const Region&
323            visibleNonTransparentRegion);
324
325    /*
326     * latchBuffer - called each time the screen is redrawn and returns whether
327     * the visible regions need to be recomputed (this is a fairly heavy
328     * operation, so this should be set only if needed). Typically this is used
329     * to figure out if the content or size of a surface has changed.
330     */
331    Region latchBuffer(bool& recomputeVisibleRegions);
332
333    bool isPotentialCursor() const { return mPotentialCursor;}
334
335    /*
336     * called with the state lock when the surface is removed from the
337     * current list
338     */
339    void onRemoved();
340
341
342    // Updates the transform hint in our SurfaceFlingerConsumer to match
343    // the current orientation of the display device.
344    void updateTransformHint(const sp<const DisplayDevice>& hw) const;
345
346    /*
347     * returns the rectangle that crops the content of the layer and scales it
348     * to the layer's size.
349     */
350    Rect getContentCrop() const;
351
352    /*
353     * Returns if a frame is queued.
354     */
355    bool hasQueuedFrame() const { return mQueuedFrames > 0 ||
356            mSidebandStreamChanged || mAutoRefresh; }
357
358#ifdef USE_HWC2
359    // -----------------------------------------------------------------------
360
361    bool hasHwcLayer(int32_t hwcId) {
362        if (mHwcLayers.count(hwcId) == 0) {
363            return false;
364        }
365        if (mHwcLayers[hwcId].layer->isAbandoned()) {
366            ALOGI("Erasing abandoned layer %s on %d", mName.string(), hwcId);
367            mHwcLayers.erase(hwcId);
368            return false;
369        }
370        return true;
371    }
372
373    std::shared_ptr<HWC2::Layer> getHwcLayer(int32_t hwcId) {
374        if (mHwcLayers.count(hwcId) == 0) {
375            return nullptr;
376        }
377        return mHwcLayers[hwcId].layer;
378    }
379
380    void setHwcLayer(int32_t hwcId, std::shared_ptr<HWC2::Layer>&& layer) {
381        if (layer) {
382            mHwcLayers[hwcId].layer = layer;
383        } else {
384            mHwcLayers.erase(hwcId);
385        }
386    }
387
388#endif
389    // -----------------------------------------------------------------------
390
391    void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip) const;
392    void setFiltering(bool filtering);
393    bool getFiltering() const;
394
395    // only for debugging
396    inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
397
398    inline  const State&    getDrawingState() const { return mDrawingState; }
399    inline  const State&    getCurrentState() const { return mCurrentState; }
400    inline  State&          getCurrentState()       { return mCurrentState; }
401
402
403    /* always call base class first */
404    void dump(String8& result, Colorizer& colorizer) const;
405    void dumpFrameStats(String8& result) const;
406    void clearFrameStats();
407    void logFrameStats();
408    void getFrameStats(FrameStats* outStats) const;
409
410    void getFenceData(String8* outName, uint64_t* outFrameNumber,
411            bool* outIsGlesComposition, nsecs_t* outPostedTime,
412            sp<Fence>* outAcquireFence, sp<Fence>* outPrevReleaseFence) const;
413
414    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
415
416    bool getFrameTimestamps(uint64_t frameNumber,
417            FrameTimestamps* outTimestamps) const {
418        return mFlinger->getFrameTimestamps(*this, frameNumber, outTimestamps);
419    }
420
421    bool getTransformToDisplayInverse() const;
422
423protected:
424    // constant
425    sp<SurfaceFlinger> mFlinger;
426
427    virtual void onFirstRef();
428
429    /*
430     * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer)
431     * is called.
432     */
433    class LayerCleaner {
434        sp<SurfaceFlinger> mFlinger;
435        wp<Layer> mLayer;
436    protected:
437        ~LayerCleaner();
438    public:
439        LayerCleaner(const sp<SurfaceFlinger>& flinger, const sp<Layer>& layer);
440    };
441
442
443private:
444    // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener
445    virtual void onFrameAvailable(const BufferItem& item) override;
446    virtual void onFrameReplaced(const BufferItem& item) override;
447    virtual void onSidebandStreamChanged() override;
448
449    void commitTransaction(const State& stateToCommit);
450
451    // needsLinearFiltering - true if this surface's state requires filtering
452    bool needsFiltering(const sp<const DisplayDevice>& hw) const;
453
454    uint32_t getEffectiveUsage(uint32_t usage) const;
455    FloatRect computeCrop(const sp<const DisplayDevice>& hw) const;
456    bool isCropped() const;
457    static bool getOpacityForFormat(uint32_t format);
458
459    // drawing
460    void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip,
461            float r, float g, float b, float alpha) const;
462    void drawWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip,
463            bool useIdentityTransform) const;
464
465    // Temporary - Used only for LEGACY camera mode.
466    uint32_t getProducerStickyTransform() const;
467
468    // Loads the corresponding system property once per process
469    static bool latchUnsignaledBuffers();
470
471    // -----------------------------------------------------------------------
472
473    class SyncPoint
474    {
475    public:
476        SyncPoint(uint64_t frameNumber) : mFrameNumber(frameNumber),
477                mFrameIsAvailable(false), mTransactionIsApplied(false) {}
478
479        uint64_t getFrameNumber() const {
480            return mFrameNumber;
481        }
482
483        bool frameIsAvailable() const {
484            return mFrameIsAvailable;
485        }
486
487        void setFrameAvailable() {
488            mFrameIsAvailable = true;
489        }
490
491        bool transactionIsApplied() const {
492            return mTransactionIsApplied;
493        }
494
495        void setTransactionApplied() {
496            mTransactionIsApplied = true;
497        }
498
499    private:
500        const uint64_t mFrameNumber;
501        std::atomic<bool> mFrameIsAvailable;
502        std::atomic<bool> mTransactionIsApplied;
503    };
504
505    // SyncPoints which will be signaled when the correct frame is at the head
506    // of the queue and dropped after the frame has been latched. Protected by
507    // mLocalSyncPointMutex.
508    Mutex mLocalSyncPointMutex;
509    std::list<std::shared_ptr<SyncPoint>> mLocalSyncPoints;
510
511    // SyncPoints which will be signaled and then dropped when the transaction
512    // is applied
513    std::list<std::shared_ptr<SyncPoint>> mRemoteSyncPoints;
514
515    uint64_t getHeadFrameNumber() const;
516    bool headFenceHasSignaled() const;
517
518    // Returns false if the relevant frame has already been latched
519    bool addSyncPoint(const std::shared_ptr<SyncPoint>& point);
520
521    void pushPendingState();
522    void popPendingState(State* stateToCommit);
523    bool applyPendingStates(State* stateToCommit);
524
525    // Returns mCurrentScaling mode (originating from the
526    // Client) or mOverrideScalingMode mode (originating from
527    // the Surface Controller) if set.
528    uint32_t getEffectiveScalingMode() const;
529public:
530    void notifyAvailableFrames();
531private:
532
533    // -----------------------------------------------------------------------
534
535    // constants
536    sp<SurfaceFlingerConsumer> mSurfaceFlingerConsumer;
537    sp<IGraphicBufferProducer> mProducer;
538    uint32_t mTextureName;      // from GLES
539    bool mPremultipliedAlpha;
540    String8 mName;
541    PixelFormat mFormat;
542
543    // these are protected by an external lock
544    State mCurrentState;
545    State mDrawingState;
546    volatile int32_t mTransactionFlags;
547
548    // Accessed from main thread and binder threads
549    Mutex mPendingStateMutex;
550    Vector<State> mPendingStates;
551
552    // thread-safe
553    volatile int32_t mQueuedFrames;
554    volatile int32_t mSidebandStreamChanged; // used like an atomic boolean
555    FrameTracker mFrameTracker;
556
557    // main thread
558    sp<GraphicBuffer> mActiveBuffer;
559    sp<NativeHandle> mSidebandStream;
560    Rect mCurrentCrop;
561    uint32_t mCurrentTransform;
562    uint32_t mCurrentScalingMode;
563    // We encode unset as -1.
564    int32_t mOverrideScalingMode;
565    bool mCurrentOpacity;
566    std::atomic<uint64_t> mCurrentFrameNumber;
567    bool mRefreshPending;
568    bool mFrameLatencyNeeded;
569    // Whether filtering is forced on or not
570    bool mFiltering;
571    // Whether filtering is needed b/c of the drawingstate
572    bool mNeedsFiltering;
573    // The mesh used to draw the layer in GLES composition mode
574    mutable Mesh mMesh;
575    // The texture used to draw the layer in GLES composition mode
576    mutable Texture mTexture;
577
578#ifdef USE_HWC2
579    // HWC items, accessed from the main thread
580    struct HWCInfo {
581        HWCInfo()
582          : layer(),
583            forceClientComposition(false),
584            compositionType(HWC2::Composition::Invalid),
585            clearClientTarget(false) {}
586
587        std::shared_ptr<HWC2::Layer> layer;
588        bool forceClientComposition;
589        HWC2::Composition compositionType;
590        bool clearClientTarget;
591    };
592    std::unordered_map<int32_t, HWCInfo> mHwcLayers;
593#else
594    bool mIsGlesComposition;
595#endif
596
597    // page-flip thread (currently main thread)
598    bool mProtectedByApp; // application requires protected path to external sink
599
600    // protected by mLock
601    mutable Mutex mLock;
602    // Set to true once we've returned this surface's handle
603    mutable bool mHasSurface;
604    const wp<Client> mClientRef;
605
606    // This layer can be a cursor on some displays.
607    bool mPotentialCursor;
608
609    // Local copy of the queued contents of the incoming BufferQueue
610    mutable Mutex mQueueItemLock;
611    Condition mQueueItemCondition;
612    Vector<BufferItem> mQueueItems;
613    std::atomic<uint64_t> mLastFrameNumberReceived;
614    bool mUpdateTexImageFailed; // This is only modified from the main thread
615
616    bool mAutoRefresh;
617    bool mFreezePositionUpdates;
618};
619
620// ---------------------------------------------------------------------------
621
622}; // namespace android
623
624#endif // ANDROID_LAYER_H
625