前言

我们接着androidP Surface到SurfaceFlinger --＞创建Surface （一）来看，当new SurfaceControl之后在其构造函数内都做了什么？这一步跟下去就到了SurfaceFlinger了。

SurfaceFlinger createLayer

对于上层应用所建立的Surface对应到SurfaceFlinger 就是 createLayer
我们来跟代码吧，还是从 SurfaceControl的构造函数开始

  private SurfaceControl(SurfaceSession session, String name, int w, int h, int format, int flags,SurfaceControl parent, int windowType, int ownerUid)throws OutOfResourcesException, IllegalArgumentException {if (session == null) {throw new IllegalArgumentException("session must not be null");}if (name == null) {throw new IllegalArgumentException("name must not be null");}if ((flags & SurfaceControl.HIDDEN) == 0) {Log.w(TAG, "Surfaces should always be created with the HIDDEN flag set "+ "to ensure that they are not made visible prematurely before "+ "all of the surface's properties have been configured.  "+ "Set the other properties and make the surface visible within "+ "a transaction.  New surface name: " + name,new Throwable());}mName = name;mWidth = w;mHeight = h;// 这里传进去的参数有，session这个是session就是持有该SurfaceControl的SurfaceSession对象，// name 就是window的名字// w，h window的宽和高// format 设置的view的格式// windowType window的类型，就是层级吧// ownerUid 创建的app的uidmNativeObject = nativeCreate(session, name, w, h, format, flags,parent != null ? parent.mNativeObject : 0, windowType, ownerUid);... ...}

frameworks/base/core/jni/android_view_SurfaceControl.cpp

static jlong nativeCreate(JNIEnv* env, jclass clazz, jobject sessionObj,jstring nameStr, jint w, jint h, jint format, jint flags, jlong parentObject,jint windowType, jint ownerUid) {ScopedUtfChars name(env, nameStr);// 前面我们知道已经创建过连接了，在new SurfaceSession的就持有了SurfaceComposerClient的对象这个直接用就可以了sp<SurfaceComposerClient> client(android_view_SurfaceSession_getClient(env, sessionObj));SurfaceControl *parent = reinterpret_cast<SurfaceControl*>(parentObject);sp<SurfaceControl> surface;// 调用 SurfaceComposerClient的createSurfaceChecked方法status_t err = client->createSurfaceChecked(String8(name.c_str()), w, h, format, &surface, flags, parent, windowType, ownerUid);if (err == NAME_NOT_FOUND) {jniThrowException(env, "java/lang/IllegalArgumentException", NULL);return 0;} else if (err != NO_ERROR) {jniThrowException(env, OutOfResourcesException, NULL);return 0;}surface->incStrong((void *)nativeCreate);return reinterpret_cast<jlong>(surface.get());
}


status_t SurfaceComposerClient::createSurfaceChecked(const String8& name,uint32_t w,uint32_t h,PixelFormat format,sp<SurfaceControl>* outSurface,uint32_t flags,SurfaceControl* parent,int32_t windowType,int32_t ownerUid)
{sp<SurfaceControl> sur;status_t err = mStatus;if (mStatus == NO_ERROR) {sp<IBinder> handle;sp<IBinder> parentHandle;// 注意哈，这里出现了IGraphicBufferProducer，生产者BufferQueueProducer的父类sp<IGraphicBufferProducer> gbp;if (parent != nullptr) {parentHandle = parent->getHandle();}// gbp取地址给了createSurface，那一般就是要给gbp分配地址了，这个client就是ISurfaceComposerClient的本地实现类。err = mClient->createSurface(name, w, h, format, flags, parentHandle,windowType, ownerUid, &handle, &gbp);ALOGE_IF(err, "SurfaceComposerClient::createSurface error %s", strerror(-err));if (err == NO_ERROR) {*outSurface = new SurfaceControl(this, handle, gbp, true /* owned */);}}return err;
}

frameworks/native/services/surfaceflinger/Client.cpp


status_t Client::createSurface(const String8& name,uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,const sp<IBinder>& parentHandle, int32_t windowType, int32_t ownerUid,sp<IBinder>* handle,sp<IGraphicBufferProducer>* gbp)
{sp<Layer> parent = nullptr;if (parentHandle != nullptr) {auto layerHandle = reinterpret_cast<Layer::Handle*>(parentHandle.get());parent = layerHandle->owner.promote();if (parent == nullptr) {return NAME_NOT_FOUND;}}if (parent == nullptr) {bool parentDied;parent = getParentLayer(&parentDied);// If we had a parent, but it died, we've lost all// our capabilities.if (parentDied) {return NAME_NOT_FOUND;}}// 继续跟到SurfaceFlinger里面return mFlinger->createLayer(name, this, w, h, format, flags, windowType,ownerUid, handle, gbp, &parent);
}

frameworks/native/services/surfaceflinger/SurfaceFlinger.cpp

//从createSurface到了createLayer
status_t SurfaceFlinger::createLayer(const String8& name,const sp<Client>& client,uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,int32_t windowType, int32_t ownerUid, sp<IBinder>* handle,sp<IGraphicBufferProducer>* gbp, sp<Layer>* parent)
{if (int32_t(w|h) < 0) {ALOGE("createLayer() failed, w or h is negative (w=%d, h=%d)",int(w), int(h));return BAD_VALUE;}ALOGE("createLayer() -> name = %s, windowType = %d",name.c_str(), windowType);status_t result = NO_ERROR;sp<Layer> layer;String8 uniqueName = getUniqueLayerName(name);// 该函数中根据flag创建不同的Layer，Layer前面说过了就是一个图层switch (flags & ISurfaceComposerClient::eFXSurfaceMask) {case ISurfaceComposerClient::eFXSurfaceNormal:// 创建了BufferLayerresult = createBufferLayer(client,uniqueName, w, h, flags, format,handle, gbp, &layer);break;case ISurfaceComposerClient::eFXSurfaceColor:result = createColorLayer(client,uniqueName, w, h, flags,handle, &layer);break;default:result = BAD_VALUE;break;}if (result != NO_ERROR) {return result;}// window type is WINDOW_TYPE_DONT_SCREENSHOT from SurfaceControl.java// TODO b/64227542if (windowType == 441731) {windowType = 2024; // TYPE_NAVIGATION_BAR_PANELlayer->setPrimaryDisplayOnly();}layer->setInfo(windowType, ownerUid);result = addClientLayer(client, *handle, *gbp, layer, *parent);if (result != NO_ERROR) {return result;}mInterceptor->saveSurfaceCreation(layer);setTransactionFlags(eTransactionNeeded);return result;
}

status_t SurfaceFlinger::createBufferLayer(const sp<Client>& client,const String8& name, uint32_t w, uint32_t h, uint32_t flags, PixelFormat& format,sp<IBinder>* handle, sp<IGraphicBufferProducer>* gbp, sp<Layer>* outLayer)
{// initialize the surfacesswitch (format) {case PIXEL_FORMAT_TRANSPARENT:case PIXEL_FORMAT_TRANSLUCENT:format = PIXEL_FORMAT_RGBA_8888;break;case PIXEL_FORMAT_OPAQUE:format = PIXEL_FORMAT_RGBX_8888;break;}// 创建出了一个BufferLayer，这个BufferLayer里面回去创建BufferCoresp<BufferLayer> layer = new BufferLayer(this, client, name, w, h, flags);status_t err = layer->setBuffers(w, h, format, flags);if (err == NO_ERROR) {*handle = layer->getHandle();*gbp = layer->getProducer();*outLayer = layer;}ALOGE_IF(err, "createBufferLayer() failed (%s)", strerror(-err));return err;
}

BufferLayer被new出来的时候会走进它的onFirstRef()方法里面

void BufferLayer::onFirstRef() {Layer::onFirstRef();// Creates a custom BufferQueue for SurfaceFlingerConsumer to usesp<IGraphicBufferProducer> producer;sp<IGraphicBufferConsumer> consumer;// 在这里面会给producer 和 consumer进行赋值BufferQueue::createBufferQueue(&producer, &consumer, true);mProducer = new MonitoredProducer(producer, mFlinger, this);{// Grab the SF state lock during this since it's the only safe way to access RenderEngineMutex::Autolock lock(mFlinger->mStateLock);mConsumer = new BufferLayerConsumer(consumer, mFlinger->getRenderEngine(), mTextureName,this);}mConsumer->setConsumerUsageBits(getEffectiveUsage(0));mConsumer->setContentsChangedListener(this);mConsumer->setName(mName);if (mFlinger->isLayerTripleBufferingDisabled()) {mProducer->setMaxDequeuedBufferCount(2);}const sp<const DisplayDevice> hw(mFlinger->getDefaultDisplayDevice());updateTransformHint(hw);
}

void BufferQueue::createBufferQueue(sp<IGraphicBufferProducer>* outProducer,sp<IGraphicBufferConsumer>* outConsumer,bool consumerIsSurfaceFlinger) {LOG_ALWAYS_FATAL_IF(outProducer == NULL,"BufferQueue: outProducer must not be NULL");LOG_ALWAYS_FATAL_IF(outConsumer == NULL,"BufferQueue: outConsumer must not be NULL");sp<BufferQueueCore> core(new BufferQueueCore());LOG_ALWAYS_FATAL_IF(core == NULL,"BufferQueue: failed to create BufferQueueCore");// 给producer进行了赋值sp<IGraphicBufferProducer> producer(new BufferQueueProducer(core, consumerIsSurfaceFlinger));LOG_ALWAYS_FATAL_IF(producer == NULL,"BufferQueue: failed to create BufferQueueProducer");// 给consumer进行了赋值sp<IGraphicBufferConsumer> consumer(new BufferQueueConsumer(core));LOG_ALWAYS_FATAL_IF(consumer == NULL,"BufferQueue: failed to create BufferQueueConsumer");// 其实我们交接buffer的操作流程都知道，这里producer是应用用来承载数据的，consumer是surfaceFlinger用来消费数据的*outProducer = producer;*outConsumer = consumer;
}

后续会接上BufferQueue的交互流程。

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androidP Surface到SurfaceFlinger --＞创建Surface (二)

创建Surface （二）

前言

SurfaceFlinger createLayer

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