libs/hwui/renderthread/RenderThread.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define LOG_TAG "RenderThread"

 #include "RenderThread.h"

 #include <gui/DisplayEventReceiver.h>
 #include <utils/Log.h>

 #include "CanvasContext.h"
 #include "RenderProxy.h"

 namespace android {
 using namespace uirenderer::renderthread;
 ANDROID_SINGLETON_STATIC_INSTANCE(RenderThread);

 namespace uirenderer {
 namespace renderthread {

 // Number of events to read at a time from the DisplayEventReceiver pipe.
 // The value should be large enough that we can quickly drain the pipe
 // using just a few large reads.
 static const size_t EVENT_BUFFER_SIZE = 100;

 // Slight delay to give the UI time to push us a new frame before we replay
 static const int DISPATCH_FRAME_CALLBACKS_DELAY = 4;

 TaskQueue::TaskQueue() : mHead(0), mTail(0) {}

 RenderTask* TaskQueue::next() {
     RenderTask* ret = mHead;
     if (ret) {
         mHead = ret->mNext;
         if (!mHead) {
             mTail = 0;
         }
         ret->mNext = 0;
     }
     return ret;
 }

 RenderTask* TaskQueue::peek() {
     return mHead;
 }

 void TaskQueue::queue(RenderTask* task) {
     // Since the RenderTask itself forms the linked list it is not allowed
     // to have the same task queued twice
     LOG_ALWAYS_FATAL_IF(task->mNext || mTail == task, "Task is already in the queue!");
     if (mTail) {
         // Fast path if we can just append
         if (mTail->mRunAt <= task->mRunAt) {
             mTail->mNext = task;
             mTail = task;
         } else {
             // Need to find the proper insertion point
             RenderTask* previous = 0;
             RenderTask* next = mHead;
             while (next && next->mRunAt <= task->mRunAt) {
                 previous = next;
                 next = next->mNext;
             }
             if (!previous) {
                 task->mNext = mHead;
                 mHead = task;
             } else {
                 previous->mNext = task;
                 if (next) {
                     task->mNext = next;
                 } else {
                     mTail = task;
                 }
             }
         }
     } else {
         mTail = mHead = task;
     }
 }

 void TaskQueue::queueAtFront(RenderTask* task) {
     if (mTail) {
         task->mNext = mHead;
         mHead = task;
     } else {
         mTail = mHead = task;
     }
 }

 void TaskQueue::remove(RenderTask* task) {
     // TaskQueue is strict here to enforce that users are keeping track of
     // their RenderTasks due to how their memory is managed
     LOG_ALWAYS_FATAL_IF(!task->mNext && mTail != task,
             "Cannot remove a task that isn't in the queue!");

     // If task is the head we can just call next() to pop it off
     // Otherwise we need to scan through to find the task before it
     if (peek() == task) {
         next();
     } else {
         RenderTask* previous = mHead;
         while (previous->mNext != task) {
             previous = previous->mNext;
         }
         previous->mNext = task->mNext;
         if (mTail == task) {
             mTail = previous;
         }
     }
 }

 class DispatchFrameCallbacks : public RenderTask {
 private:
     RenderThread* mRenderThread;
 public:
     DispatchFrameCallbacks(RenderThread* rt) : mRenderThread(rt) {}

     virtual void run() {
         mRenderThread->dispatchFrameCallbacks();
     }
 };

 RenderThread::RenderThread() : Thread(true), Singleton<RenderThread>()
         , mNextWakeup(LLONG_MAX)
         , mDisplayEventReceiver(0)
         , mVsyncRequested(false)
         , mFrameCallbackTaskPending(false)
         , mFrameCallbackTask(0) {
     mFrameCallbackTask = new DispatchFrameCallbacks(this);
     mLooper = new Looper(false);
     run("RenderThread");
 }

 RenderThread::~RenderThread() {
 }

 void RenderThread::initializeDisplayEventReceiver() {
     LOG_ALWAYS_FATAL_IF(mDisplayEventReceiver, "Initializing a second DisplayEventReceiver?");
     mDisplayEventReceiver = new DisplayEventReceiver();
     status_t status = mDisplayEventReceiver->initCheck();
     LOG_ALWAYS_FATAL_IF(status != NO_ERROR, "Initialization of DisplayEventReceiver "
             "failed with status: %d", status);

     // Register the FD
     mLooper->addFd(mDisplayEventReceiver->getFd(), 0,
             Looper::EVENT_INPUT, RenderThread::displayEventReceiverCallback, this);
 }

 int RenderThread::displayEventReceiverCallback(int fd, int events, void* data) {
     if (events & (Looper::EVENT_ERROR | Looper::EVENT_HANGUP)) {
         ALOGE("Display event receiver pipe was closed or an error occurred.  "
                 "events=0x%x", events);
         return 0; // remove the callback
     }

     if (!(events & Looper::EVENT_INPUT)) {
         ALOGW("Received spurious callback for unhandled poll event.  "
                 "events=0x%x", events);
         return 1; // keep the callback
     }

     reinterpret_cast<RenderThread*>(data)->drainDisplayEventQueue();

     return 1; // keep the callback
 }

 static nsecs_t latestVsyncEvent(DisplayEventReceiver* receiver) {
     DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
     nsecs_t latest = 0;
     ssize_t n;
     while ((n = receiver->getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
         for (ssize_t i = 0; i < n; i++) {
             const DisplayEventReceiver::Event& ev = buf[i];
             switch (ev.header.type) {
             case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
                 latest = ev.header.timestamp;
                 break;
             }
         }
     }
     if (n < 0) {
         ALOGW("Failed to get events from display event receiver, status=%d", status_t(n));
     }
     return latest;
 }

 void RenderThread::drainDisplayEventQueue(bool skipCallbacks) {
     ATRACE_CALL();
     nsecs_t vsyncEvent = latestVsyncEvent(mDisplayEventReceiver);
     if (vsyncEvent > 0) {
         mVsyncRequested = false;
         mTimeLord.vsyncReceived(vsyncEvent);
         if (!skipCallbacks && !mFrameCallbackTaskPending) {
             ATRACE_NAME("queue mFrameCallbackTask");
             mFrameCallbackTaskPending = true;
             queueDelayed(mFrameCallbackTask, DISPATCH_FRAME_CALLBACKS_DELAY);
         }
     }
 }

 void RenderThread::dispatchFrameCallbacks() {
     ATRACE_CALL();
     mFrameCallbackTaskPending = false;

     std::set<IFrameCallback*> callbacks;
     mFrameCallbacks.swap(callbacks);

     for (std::set<IFrameCallback*>::iterator it = callbacks.begin(); it != callbacks.end(); it++) {
         (*it)->doFrame();
     }
 }

 void RenderThread::requestVsync() {
     if (!mVsyncRequested) {
         mVsyncRequested = true;
         status_t status = mDisplayEventReceiver->requestNextVsync();
         LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
                 "requestNextVsync failed with status: %d", status);
     }
 }

 bool RenderThread::threadLoop() {
     initializeDisplayEventReceiver();

     int timeoutMillis = -1;
     for (;;) {
         int result = mLooper->pollOnce(timeoutMillis);
         LOG_ALWAYS_FATAL_IF(result == Looper::POLL_ERROR,
                 "RenderThread Looper POLL_ERROR!");

         nsecs_t nextWakeup;
         // Process our queue, if we have anything
         while (RenderTask* task = nextTask(&nextWakeup)) {
             task->run();
             // task may have deleted itself, do not reference it again
         }
         if (nextWakeup == LLONG_MAX) {
             timeoutMillis = -1;
         } else {
             nsecs_t timeoutNanos = nextWakeup - systemTime(SYSTEM_TIME_MONOTONIC);
             timeoutMillis = nanoseconds_to_milliseconds(timeoutNanos);
             if (timeoutMillis < 0) {
                 timeoutMillis = 0;
             }
         }

         if (mPendingRegistrationFrameCallbacks.size() && !mFrameCallbackTaskPending) {
             drainDisplayEventQueue(true);
             mFrameCallbacks.insert(
                     mPendingRegistrationFrameCallbacks.begin(), mPendingRegistrationFrameCallbacks.end());
             mPendingRegistrationFrameCallbacks.clear();
             requestVsync();
         }
     }

     return false;
 }

 void RenderThread::queue(RenderTask* task) {
     AutoMutex _lock(mLock);
     mQueue.queue(task);
     if (mNextWakeup && task->mRunAt < mNextWakeup) {
         mNextWakeup = 0;
         mLooper->wake();
     }
 }

 void RenderThread::queueAtFront(RenderTask* task) {
     AutoMutex _lock(mLock);
     mQueue.queueAtFront(task);
     mLooper->wake();
 }

 void RenderThread::queueDelayed(RenderTask* task, int delayMs) {
     nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
     task->mRunAt = now + milliseconds_to_nanoseconds(delayMs);
     queue(task);
 }

 void RenderThread::remove(RenderTask* task) {
     AutoMutex _lock(mLock);
     mQueue.remove(task);
 }

 void RenderThread::postFrameCallback(IFrameCallback* callback) {
     mPendingRegistrationFrameCallbacks.insert(callback);
 }

 void RenderThread::removeFrameCallback(IFrameCallback* callback) {
     mFrameCallbacks.erase(callback);
     mPendingRegistrationFrameCallbacks.erase(callback);
 }

 void RenderThread::pushBackFrameCallback(IFrameCallback* callback) {
     if (mFrameCallbacks.erase(callback)) {
         mPendingRegistrationFrameCallbacks.insert(callback);
     }
 }

 RenderTask* RenderThread::nextTask(nsecs_t* nextWakeup) {
     AutoMutex _lock(mLock);
     RenderTask* next = mQueue.peek();
     if (!next) {
         mNextWakeup = LLONG_MAX;
     } else {
         mNextWakeup = next->mRunAt;
         // Most tasks won't be delayed, so avoid unnecessary systemTime() calls
         if (next->mRunAt <= 0 || next->mRunAt <= systemTime(SYSTEM_TIME_MONOTONIC)) {
             next = mQueue.next();
         } else {
             next = 0;
         }
     }
     if (nextWakeup) {
         *nextWakeup = mNextWakeup;
     }
     return next;
 }

 } /* namespace renderthread */
 } /* namespace uirenderer */
 } /* namespace android */
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define LOG_TAG "RenderThread"

	#include "RenderThread.h"

	#include <gui/DisplayEventReceiver.h>
	#include <utils/Log.h>

	#include "CanvasContext.h"
	#include "RenderProxy.h"

	namespace android {
	using namespace uirenderer::renderthread;
	ANDROID_SINGLETON_STATIC_INSTANCE(RenderThread);

	namespace uirenderer {
	namespace renderthread {

	// Number of events to read at a time from the DisplayEventReceiver pipe.
	// The value should be large enough that we can quickly drain the pipe
	// using just a few large reads.
	static const size_t EVENT_BUFFER_SIZE = 100;

	// Slight delay to give the UI time to push us a new frame before we replay
	static const int DISPATCH_FRAME_CALLBACKS_DELAY = 4;

	TaskQueue::TaskQueue() : mHead(0), mTail(0) {}

	RenderTask* TaskQueue::next() {
	RenderTask* ret = mHead;
	if (ret) {
	mHead = ret->mNext;
	if (!mHead) {
	mTail = 0;
	}
	ret->mNext = 0;
	}
	return ret;
	}

	RenderTask* TaskQueue::peek() {
	return mHead;
	}

	void TaskQueue::queue(RenderTask* task) {
	// Since the RenderTask itself forms the linked list it is not allowed
	// to have the same task queued twice
	LOG_ALWAYS_FATAL_IF(task->mNext \|\| mTail == task, "Task is already in the queue!");
	if (mTail) {
	// Fast path if we can just append
	if (mTail->mRunAt <= task->mRunAt) {
	mTail->mNext = task;
	mTail = task;
	} else {
	// Need to find the proper insertion point
	RenderTask* previous = 0;
	RenderTask* next = mHead;
	while (next && next->mRunAt <= task->mRunAt) {
	previous = next;
	next = next->mNext;
	}
	if (!previous) {
	task->mNext = mHead;
	mHead = task;
	} else {
	previous->mNext = task;
	if (next) {
	task->mNext = next;
	} else {
	mTail = task;
	}
	}
	}
	} else {
	mTail = mHead = task;
	}
	}

	void TaskQueue::queueAtFront(RenderTask* task) {
	if (mTail) {
	task->mNext = mHead;
	mHead = task;
	} else {
	mTail = mHead = task;
	}
	}

	void TaskQueue::remove(RenderTask* task) {
	// TaskQueue is strict here to enforce that users are keeping track of
	// their RenderTasks due to how their memory is managed
	LOG_ALWAYS_FATAL_IF(!task->mNext && mTail != task,
	"Cannot remove a task that isn't in the queue!");

	// If task is the head we can just call next() to pop it off
	// Otherwise we need to scan through to find the task before it
	if (peek() == task) {
	next();
	} else {
	RenderTask* previous = mHead;
	while (previous->mNext != task) {
	previous = previous->mNext;
	}
	previous->mNext = task->mNext;
	if (mTail == task) {
	mTail = previous;
	}
	}
	}

	class DispatchFrameCallbacks : public RenderTask {
	private:
	RenderThread* mRenderThread;
	public:
	DispatchFrameCallbacks(RenderThread* rt) : mRenderThread(rt) {}

	virtual void run() {
	mRenderThread->dispatchFrameCallbacks();
	}
	};

	RenderThread::RenderThread() : Thread(true), Singleton<RenderThread>()
	, mNextWakeup(LLONG_MAX)
	, mDisplayEventReceiver(0)
	, mVsyncRequested(false)
	, mFrameCallbackTaskPending(false)
	, mFrameCallbackTask(0) {
	mFrameCallbackTask = new DispatchFrameCallbacks(this);
	mLooper = new Looper(false);
	run("RenderThread");
	}

	RenderThread::~RenderThread() {
	}

	void RenderThread::initializeDisplayEventReceiver() {
	LOG_ALWAYS_FATAL_IF(mDisplayEventReceiver, "Initializing a second DisplayEventReceiver?");
	mDisplayEventReceiver = new DisplayEventReceiver();
	status_t status = mDisplayEventReceiver->initCheck();
	LOG_ALWAYS_FATAL_IF(status != NO_ERROR, "Initialization of DisplayEventReceiver "
	"failed with status: %d", status);

	// Register the FD
	mLooper->addFd(mDisplayEventReceiver->getFd(), 0,
	Looper::EVENT_INPUT, RenderThread::displayEventReceiverCallback, this);
	}

	int RenderThread::displayEventReceiverCallback(int fd, int events, void* data) {
	if (events & (Looper::EVENT_ERROR \| Looper::EVENT_HANGUP)) {
	ALOGE("Display event receiver pipe was closed or an error occurred. "
	"events=0x%x", events);
	return 0; // remove the callback
	}

	if (!(events & Looper::EVENT_INPUT)) {
	ALOGW("Received spurious callback for unhandled poll event. "
	"events=0x%x", events);
	return 1; // keep the callback
	}

	reinterpret_cast<RenderThread*>(data)->drainDisplayEventQueue();

	return 1; // keep the callback
	}

	static nsecs_t latestVsyncEvent(DisplayEventReceiver* receiver) {
	DisplayEventReceiver::Event buf[EVENT_BUFFER_SIZE];
	nsecs_t latest = 0;
	ssize_t n;
	while ((n = receiver->getEvents(buf, EVENT_BUFFER_SIZE)) > 0) {
	for (ssize_t i = 0; i < n; i++) {
	const DisplayEventReceiver::Event& ev = buf[i];
	switch (ev.header.type) {
	case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
	latest = ev.header.timestamp;
	break;
	}
	}
	}
	if (n < 0) {
	ALOGW("Failed to get events from display event receiver, status=%d", status_t(n));
	}
	return latest;
	}

	void RenderThread::drainDisplayEventQueue(bool skipCallbacks) {
	ATRACE_CALL();
	nsecs_t vsyncEvent = latestVsyncEvent(mDisplayEventReceiver);
	if (vsyncEvent > 0) {
	mVsyncRequested = false;
	mTimeLord.vsyncReceived(vsyncEvent);
	if (!skipCallbacks && !mFrameCallbackTaskPending) {
	ATRACE_NAME("queue mFrameCallbackTask");
	mFrameCallbackTaskPending = true;
	queueDelayed(mFrameCallbackTask, DISPATCH_FRAME_CALLBACKS_DELAY);
	}
	}
	}

	void RenderThread::dispatchFrameCallbacks() {
	ATRACE_CALL();
	mFrameCallbackTaskPending = false;

	std::set<IFrameCallback*> callbacks;
	mFrameCallbacks.swap(callbacks);

	for (std::set<IFrameCallback*>::iterator it = callbacks.begin(); it != callbacks.end(); it++) {
	(*it)->doFrame();
	}
	}

	void RenderThread::requestVsync() {
	if (!mVsyncRequested) {
	mVsyncRequested = true;
	status_t status = mDisplayEventReceiver->requestNextVsync();
	LOG_ALWAYS_FATAL_IF(status != NO_ERROR,
	"requestNextVsync failed with status: %d", status);
	}
	}

	bool RenderThread::threadLoop() {
	initializeDisplayEventReceiver();

	int timeoutMillis = -1;
	for (;;) {
	int result = mLooper->pollOnce(timeoutMillis);
	LOG_ALWAYS_FATAL_IF(result == Looper::POLL_ERROR,
	"RenderThread Looper POLL_ERROR!");

	nsecs_t nextWakeup;
	// Process our queue, if we have anything
	while (RenderTask* task = nextTask(&nextWakeup)) {
	task->run();
	// task may have deleted itself, do not reference it again
	}
	if (nextWakeup == LLONG_MAX) {
	timeoutMillis = -1;
	} else {
	nsecs_t timeoutNanos = nextWakeup - systemTime(SYSTEM_TIME_MONOTONIC);
	timeoutMillis = nanoseconds_to_milliseconds(timeoutNanos);
	if (timeoutMillis < 0) {
	timeoutMillis = 0;
	}
	}

	if (mPendingRegistrationFrameCallbacks.size() && !mFrameCallbackTaskPending) {
	drainDisplayEventQueue(true);
	mFrameCallbacks.insert(
	mPendingRegistrationFrameCallbacks.begin(), mPendingRegistrationFrameCallbacks.end());
	mPendingRegistrationFrameCallbacks.clear();
	requestVsync();
	}
	}

	return false;
	}

	void RenderThread::queue(RenderTask* task) {
	AutoMutex _lock(mLock);
	mQueue.queue(task);
	if (mNextWakeup && task->mRunAt < mNextWakeup) {
	mNextWakeup = 0;
	mLooper->wake();
	}
	}

	void RenderThread::queueAtFront(RenderTask* task) {
	AutoMutex _lock(mLock);
	mQueue.queueAtFront(task);
	mLooper->wake();
	}

	void RenderThread::queueDelayed(RenderTask* task, int delayMs) {
	nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
	task->mRunAt = now + milliseconds_to_nanoseconds(delayMs);
	queue(task);
	}

	void RenderThread::remove(RenderTask* task) {
	AutoMutex _lock(mLock);
	mQueue.remove(task);
	}

	void RenderThread::postFrameCallback(IFrameCallback* callback) {
	mPendingRegistrationFrameCallbacks.insert(callback);
	}

	void RenderThread::removeFrameCallback(IFrameCallback* callback) {
	mFrameCallbacks.erase(callback);
	mPendingRegistrationFrameCallbacks.erase(callback);
	}

	void RenderThread::pushBackFrameCallback(IFrameCallback* callback) {
	if (mFrameCallbacks.erase(callback)) {
	mPendingRegistrationFrameCallbacks.insert(callback);
	}
	}

	RenderTask* RenderThread::nextTask(nsecs_t* nextWakeup) {
	AutoMutex _lock(mLock);
	RenderTask* next = mQueue.peek();
	if (!next) {
	mNextWakeup = LLONG_MAX;
	} else {
	mNextWakeup = next->mRunAt;
	// Most tasks won't be delayed, so avoid unnecessary systemTime() calls
	if (next->mRunAt <= 0 \|\| next->mRunAt <= systemTime(SYSTEM_TIME_MONOTONIC)) {
	next = mQueue.next();
	} else {
	next = 0;
	}
	}
	if (nextWakeup) {
	*nextWakeup = mNextWakeup;
	}
	return next;
	}

	} /* namespace renderthread */
	} /* namespace uirenderer */
	} /* namespace android */