Use WeakPtr for posting cc tasks to main thread

cc/thread_proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/delay_based_time_source.h"
 #include "cc/draw_quad.h"
 #include "cc/frame_rate_controller.h"
 #include "cc/input_handler.h"
 #include "cc/layer_tree_host.h"
 #include "cc/output_surface.h"
 #include "cc/scheduler.h"
-#include "cc/scoped_thread_proxy.h"
 #include "cc/thread.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSharedGraphicsContext3D.h"
 
 using WebKit::WebSharedGraphicsContext3D;
 
 namespace {
 
 // Measured in seconds.
 const double contextRecreationTickRate = 0.03;
 
@@ skipping 11 matching lines @@
     , m_animateRequested(false)
     , m_commitRequested(false)
     , m_commitRequestSentToImplThread(false)
     , m_layerTreeHost(layerTreeHost)
     , m_rendererInitialized(false)
     , m_started(false)
     , m_texturesAcquired(true)
     , m_inCompositeAndReadback(false)
     , m_manageTilesPending(false)
     , m_weakFactoryOnImplThread(ALLOW_THIS_IN_INITIALIZER_LIST(this))
-    , m_mainThreadProxy(ScopedThreadProxy::create(Proxy::mainThread()))
+    , m_weakFactory(ALLOW_THIS_IN_INITIALIZER_LIST(this))
     , m_beginFrameCompletionEventOnImplThread(0)
     , m_readbackRequestOnImplThread(0)
     , m_commitCompletionEventOnImplThread(0)
     , m_textureAcquisitionCompletionEventOnImplThread(0)
     , m_nextFrameIsNewlyCommittedFrameOnImplThread(false)
     , m_renderVSyncEnabled(layerTreeHost->settings().renderVSyncEnabled)
     , m_totalCommitCount(0)
     , m_deferCommits(false)
 {
     TRACE_EVENT0("cc", "ThreadProxy::ThreadProxy");
@@ skipping 244 matching lines @@
     DCHECK(isImplThread());
     TRACE_EVENT0("cc", "ThreadProxy::didLoseOutputSurfaceOnImplThread");
     m_schedulerOnImplThread->didLoseOutputSurface();
 }
 
 void ThreadProxy::onSwapBuffersCompleteOnImplThread()
 {
     DCHECK(isImplThread());
     TRACE_EVENT0("cc", "ThreadProxy::onSwapBuffersCompleteOnImplThread");
     m_schedulerOnImplThread->didSwapBuffersComplete();
-    m_mainThreadProxy->postTask(FROM_HERE, base::Bind(&ThreadProxy::didCompleteSwapBuffers, base::Unretained(this)));
+    Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::didCompleteSwapBuffers, m_mainThreadWeakPtr));
 }
 
 void ThreadProxy::onVSyncParametersChanged(base::TimeTicks timebase, base::TimeDelta interval)
 {
     DCHECK(isImplThread());
     TRACE_EVENT2("cc", "ThreadProxy::onVSyncParametersChanged", "timebase", (timebase - base::TimeTicks()).InMilliseconds(), "interval", interval.InMilliseconds());
     m_schedulerOnImplThread->setTimebaseAndInterval(timebase, interval);
 }
 
 void ThreadProxy::onCanDrawStateChanged(bool canDraw)
@@ skipping 30 matching lines @@
 {
     DCHECK(isImplThread());
     TRACE_EVENT0("cc", "ThreadProxy::setNeedsForcedCommitOnImplThread");
     m_schedulerOnImplThread->setNeedsForcedCommit();
 }
 
 void ThreadProxy::postAnimationEventsToMainThreadOnImplThread(scoped_ptr<AnimationEventsVector> events, base::Time wallClockTime)
 {
     DCHECK(isImplThread());
     TRACE_EVENT0("cc", "ThreadProxy::postAnimationEventsToMainThreadOnImplThread");
-    m_mainThreadProxy->postTask(FROM_HERE, base::Bind(&ThreadProxy::setAnimationEvents, base::Unretained(this), base::Passed(events.Pass()), wallClockTime));
+    Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::setAnimationEvents, m_mainThreadWeakPtr, base::Passed(events.Pass()), wallClockTime));
 }
 
 bool ThreadProxy::reduceContentsTextureMemoryOnImplThread(size_t limitBytes, int priorityCutoff)
 {
     DCHECK(isImplThread());
 
     if (!m_layerTreeHost->contentsTextureManager())
         return false;
 
     bool reduceResult = m_layerTreeHost->contentsTextureManager()->reduceMemoryOnImplThread(limitBytes, priorityCutoff, m_layerTreeHostImpl->resourceProvider());
@@ skipping 34 matching lines @@
     DCHECK(isMainThread());
     DCHECK_NE(m_deferCommits, deferCommits);
     m_deferCommits = deferCommits;
 
     if (m_deferCommits)
         TRACE_EVENT_ASYNC_BEGIN0("cc", "ThreadProxy::setDeferCommits", this);
     else
         TRACE_EVENT_ASYNC_END0("cc", "ThreadProxy::setDeferCommits", this);
 
     if (!m_deferCommits && m_pendingDeferredCommit)
-        m_mainThreadProxy->postTask(FROM_HERE, base::Bind(&ThreadProxy::beginFrame, base::Unretained(this), base::Passed(m_pendingDeferredCommit.Pass())));
+        Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::beginFrame, m_mainThreadWeakPtr, base::Passed(m_pendingDeferredCommit.Pass())));
 }
 
 bool ThreadProxy::commitRequested() const
 {
     DCHECK(isMainThread());
     return m_commitRequested;
 }
 
 void ThreadProxy::setNeedsRedrawOnImplThread()
 {
@@ skipping 12 matching lines @@
 {
     DCHECK(isMainThread());
     DCHECK(Proxy::implThread());
     // Create LayerTreeHostImpl.
     DebugScopedSetMainThreadBlocked mainThreadBlocked(this);
     CompletionEvent completion;
     scoped_ptr<InputHandler> handler = m_layerTreeHost->createInputHandler();
     Proxy::implThread()->postTask(base::Bind(&ThreadProxy::initializeImplOnImplThread, base::Unretained(this), &completion, handler.release()));
     completion.wait();
 
+    m_mainThreadWeakPtr = m_weakFactory.GetWeakPtr();
+
     m_started = true;
 }
 
 void ThreadProxy::stop()
 {
     TRACE_EVENT0("cc", "ThreadProxy::stop");
     DCHECK(isMainThread());
     DCHECK(m_started);
 
     // Synchronously deletes the impl.
     {
         DebugScopedSetMainThreadBlocked mainThreadBlocked(this);
 
         CompletionEvent completion;
         Proxy::implThread()->postTask(base::Bind(&ThreadProxy::layerTreeHostClosedOnImplThread, m_implThreadWeakPtr, &completion));
         completion.wait();
     }
 
-    m_mainThreadProxy->shutdown(); // Stop running tasks posted to us.
+    m_weakFactory.InvalidateWeakPtrs();
 
     DCHECK(!m_layerTreeHostImpl.get()); // verify that the impl deleted.
     m_layerTreeHost = 0;
     m_started = false;
 }
 
 void ThreadProxy::forceSerializeOnSwapBuffers()
 {
     DebugScopedSetMainThreadBlocked mainThreadBlocked(this);
     CompletionEvent completion;
@@ skipping 33 matching lines @@
 
 void ThreadProxy::scheduledActionBeginFrame()
 {
     TRACE_EVENT0("cc", "ThreadProxy::scheduledActionBeginFrame");
     scoped_ptr<BeginFrameAndCommitState> beginFrameState(new BeginFrameAndCommitState);
     beginFrameState->monotonicFrameBeginTime = base::TimeTicks::Now();
     beginFrameState->scrollInfo = m_layerTreeHostImpl->processScrollDeltas();
     beginFrameState->implTransform = m_layerTreeHostImpl->implTransform();
     DCHECK_GT(m_layerTreeHostImpl->memoryAllocationLimitBytes(), 0u);
     beginFrameState->memoryAllocationLimitBytes = m_layerTreeHostImpl->memoryAllocationLimitBytes();
-    m_mainThreadProxy->postTask(FROM_HERE, base::Bind(&ThreadProxy::beginFrame, base::Unretained(this), base::Passed(beginFrameState.Pass())));
+    Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::beginFrame, m_mainThreadWeakPtr, base::Passed(beginFrameState.Pass())));
 
     if (m_beginFrameCompletionEventOnImplThread) {
         m_beginFrameCompletionEventOnImplThread->signal();
         m_beginFrameCompletionEventOnImplThread = 0;
     }
 }
 
 void ThreadProxy::beginFrame(scoped_ptr<BeginFrameAndCommitState> beginFrameState)
 {
     TRACE_EVENT0("cc", "ThreadProxy::beginFrame");
@@ skipping 178 matching lines @@
     m_commitCompletionEventOnImplThread->signal();
     m_commitCompletionEventOnImplThread = 0;
 
     // SetVisible kicks off the next scheduler action, so this must be last.
     m_schedulerOnImplThread->setVisible(m_layerTreeHostImpl->visible());
 }
 
 void ThreadProxy::scheduledActionBeginContextRecreation()
 {
     DCHECK(isImplThread());
-    m_mainThreadProxy->postTask(FROM_HERE, base::Bind(&ThreadProxy::beginContextRecreation, base::Unretained(this)));
+    Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::beginContextRecreation, m_mainThreadWeakPtr));
 }
 
 ScheduledActionDrawAndSwapResult ThreadProxy::scheduledActionDrawAndSwapInternal(bool forcedDraw)
 {
     TRACE_EVENT0("cc", "ThreadProxy::scheduledActionDrawAndSwap");
     ScheduledActionDrawAndSwapResult result;
     result.didDraw = false;
     result.didSwap = false;
     DCHECK(isImplThread());
     DCHECK(m_layerTreeHostImpl.get());
@@ skipping 37 matching lines @@
             m_readbackRequestOnImplThread->success = !m_layerTreeHostImpl->isContextLost();
         }
         m_readbackRequestOnImplThread->completion.signal();
         m_readbackRequestOnImplThread = 0;
     } else if (drawFrame)
         result.didSwap = m_layerTreeHostImpl->swapBuffers();
 
     // Tell the main thread that the the newly-commited frame was drawn.
     if (m_nextFrameIsNewlyCommittedFrameOnImplThread) {
         m_nextFrameIsNewlyCommittedFrameOnImplThread = false;
-        m_mainThreadProxy->postTask(FROM_HERE, base::Bind(&ThreadProxy::didCommitAndDrawFrame, base::Unretained(this)));
+        Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::didCommitAndDrawFrame, m_mainThreadWeakPtr));
     }
 
     return result;
 }
 
 void ThreadProxy::acquireLayerTextures()
 {
     // Called when the main thread needs to modify a layer texture that is used
     // directly by the compositor.
     // This method will block until the next compositor draw if there is a
@@ skipping 207 matching lines @@
 }
 
 void ThreadProxy::commitPendingOnImplThreadForTesting(CommitPendingRequest* request)
 {
     DCHECK(isImplThread());
     request->commitPending = m_schedulerOnImplThread->commitPending();
     request->completion.signal();
 }
 
 }  // namespace cc