The Tor Browser: comparison gfx/layers/ipc/CompositorChild.cpp

--1:000000000000
+:f81e13753cbb
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=2 et tw=80 : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this
+* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "CompositorChild.h"
+#include <stddef.h>                     // for size_t
+#include "ClientLayerManager.h"         // for ClientLayerManager
+#include "base/message_loop.h"          // for MessageLoop
+#include "base/process_util.h"          // for OpenProcessHandle
+#include "base/task.h"                  // for NewRunnableMethod, etc
+#include "base/tracked.h"               // for FROM_HERE
+#include "mozilla/layers/LayerTransactionChild.h"
+#include "mozilla/layers/PLayerTransactionChild.h"
+#include "mozilla/mozalloc.h"           // for operator new, etc
+#include "nsDebug.h"                    // for NS_RUNTIMEABORT
+#include "nsIObserver.h"                // for nsIObserver
+#include "nsISupportsImpl.h"            // for MOZ_COUNT_CTOR, etc
+#include "nsTArray.h"                   // for nsTArray, nsTArray_Impl
+#include "nsXULAppAPI.h"                // for XRE_GetIOMessageLoop, etc
+#include "FrameLayerBuilder.h"
+#include "mozilla/dom/TabChild.h"
+using mozilla::layers::LayerTransactionChild;
+namespace mozilla {
+namespace layers {
+/*static*/ CompositorChild* CompositorChild::sCompositor;
+Atomic<int32_t> CompositableForwarder::sSerialCounter(0);
+CompositorChild::CompositorChild(ClientLayerManager *aLayerManager)
+: mLayerManager(aLayerManager)
+{
+MOZ_COUNT_CTOR(CompositorChild);
+}
+CompositorChild::~CompositorChild()
+{
+MOZ_COUNT_DTOR(CompositorChild);
+}
+void
+CompositorChild::Destroy()
+{
+mLayerManager->Destroy();
+mLayerManager = nullptr;
+while (size_t len = ManagedPLayerTransactionChild().Length()) {
+LayerTransactionChild* layers =
+static_cast<LayerTransactionChild*>(ManagedPLayerTransactionChild()[len - 1]);
+layers->Destroy();
+}
+SendStop();
+}
+bool
+CompositorChild::LookupCompositorFrameMetrics(const FrameMetrics::ViewID aId,
+FrameMetrics& aFrame)
+{
+SharedFrameMetricsData* data = mFrameMetricsTable.Get(aId);
+if (data) {
+data->CopyFrameMetrics(&aFrame);
+return true;
+}
+return false;
+}
+/*static*/ PCompositorChild*
+CompositorChild::Create(Transport* aTransport, ProcessId aOtherProcess)
+{
+// There's only one compositor per child process.
+MOZ_ASSERT(!sCompositor);
+nsRefPtr<CompositorChild> child(new CompositorChild(nullptr));
+ProcessHandle handle;
+if (!base::OpenProcessHandle(aOtherProcess, &handle)) {
+// We can't go on without a compositor.
+NS_RUNTIMEABORT("Couldn't OpenProcessHandle() to parent process.");
+return nullptr;
+}
+if (!child->Open(aTransport, handle, XRE_GetIOMessageLoop(), ipc::ChildSide)) {
+NS_RUNTIMEABORT("Couldn't Open() Compositor channel.");
+return nullptr;
+}
+// We release this ref in ActorDestroy().
+return sCompositor = child.forget().take();
+}
+/*static*/ CompositorChild*
+CompositorChild::Get()
+{
+// This is only expected to be used in child processes.
+MOZ_ASSERT(XRE_GetProcessType() != GeckoProcessType_Default);
+return sCompositor;
+}
+PLayerTransactionChild*
+CompositorChild::AllocPLayerTransactionChild(const nsTArray<LayersBackend>& aBackendHints,
+const uint64_t& aId,
+TextureFactoryIdentifier*,
+bool*)
+{
+LayerTransactionChild* c = new LayerTransactionChild();
+c->AddIPDLReference();
+return c;
+}
+bool
+CompositorChild::DeallocPLayerTransactionChild(PLayerTransactionChild* actor)
+{
+static_cast<LayerTransactionChild*>(actor)->ReleaseIPDLReference();
+return true;
+}
+bool
+CompositorChild::RecvInvalidateAll()
+{
+FrameLayerBuilder::InvalidateAllLayers(mLayerManager);
+return true;
+}
+bool
+CompositorChild::RecvDidComposite(const uint64_t& aId)
+{
+if (mLayerManager) {
+MOZ_ASSERT(aId == 0);
+mLayerManager->DidComposite();
+} else if (aId != 0) {
+dom::TabChild *child = dom::TabChild::GetFrom(aId);
+if (child) {
+child->DidComposite();
+}
+}
+return true;
+}
+void
+CompositorChild::ActorDestroy(ActorDestroyReason aWhy)
+{
+MOZ_ASSERT(sCompositor == this);
+#ifdef MOZ_B2G
+// Due to poor lifetime management of gralloc (and possibly shmems) we will
+// crash at some point in the future when we get destroyed due to abnormal
+// shutdown. Its better just to crash here. On desktop though, we have a chance
+// of recovering.
+if (aWhy == AbnormalShutdown) {
+NS_RUNTIMEABORT("ActorDestroy by IPC channel failure at CompositorChild");
+}
+#endif
+if (sCompositor) {
+sCompositor->Release();
+sCompositor = nullptr;
+}
+// We don't want to release the ref to sCompositor here, during
+// cleanup, because that will cause it to be deleted while it's
+// still being used.  So defer the deletion to after it's not in
+// use.
+MessageLoop::current()->PostTask(
+FROM_HERE,
+NewRunnableMethod(this, &CompositorChild::Release));
+}
+bool
+CompositorChild::RecvSharedCompositorFrameMetrics(
+const mozilla::ipc::SharedMemoryBasic::Handle& metrics,
+const CrossProcessMutexHandle& handle,
+const uint32_t& aAPZCId)
+{
+SharedFrameMetricsData* data = new SharedFrameMetricsData(metrics, handle, aAPZCId);
+mFrameMetricsTable.Put(data->GetViewID(), data);
+return true;
+}
+bool
+CompositorChild::RecvReleaseSharedCompositorFrameMetrics(
+const ViewID& aId,
+const uint32_t& aAPZCId)
+{
+SharedFrameMetricsData* data = mFrameMetricsTable.Get(aId);
+// The SharedFrameMetricsData may have been removed previously if
+// a SharedFrameMetricsData with the same ViewID but later APZCId had
+// been store and over wrote it.
+if (data && (data->GetAPZCId() == aAPZCId)) {
+mFrameMetricsTable.Remove(aId);
+}
+return true;
+}
+CompositorChild::SharedFrameMetricsData::SharedFrameMetricsData(
+const ipc::SharedMemoryBasic::Handle& metrics,
+const CrossProcessMutexHandle& handle,
+const uint32_t& aAPZCId) :
+mBuffer(nullptr),
+mMutex(nullptr),
+mAPZCId(aAPZCId)
+{
+mBuffer = new ipc::SharedMemoryBasic(metrics);
+mBuffer->Map(sizeof(FrameMetrics));
+mMutex = new CrossProcessMutex(handle);
+MOZ_COUNT_CTOR(SharedFrameMetricsData);
+}
+CompositorChild::SharedFrameMetricsData::~SharedFrameMetricsData()
+{
+// When the hash table deletes the class, delete
+// the shared memory and mutex.
+delete mMutex;
+delete mBuffer;
+MOZ_COUNT_DTOR(SharedFrameMetricsData);
+}
+void
+CompositorChild::SharedFrameMetricsData::CopyFrameMetrics(FrameMetrics* aFrame)
+{
+FrameMetrics* frame = static_cast<FrameMetrics*>(mBuffer->memory());
+MOZ_ASSERT(frame);
+mMutex->Lock();
+*aFrame = *frame;
+mMutex->Unlock();
+}
+FrameMetrics::ViewID
+CompositorChild::SharedFrameMetricsData::GetViewID()
+{
+FrameMetrics* frame = static_cast<FrameMetrics*>(mBuffer->memory());
+MOZ_ASSERT(frame);
+// Not locking to read of mScrollId since it should not change after being
+// initially set.
+return frame->GetScrollId();
+}
+uint32_t
+CompositorChild::SharedFrameMetricsData::GetAPZCId()
+{
+return mAPZCId;
+}
+} // namespace layers
+} // namespace mozilla

The Tor Browser / file comparison

comparison: gfx/layers/ipc/CompositorChild.cpp

gfx/layers/ipc/CompositorChild.cpp