1 files changed, 188 insertions, 0 deletions
diff --git a/gfx/layers/ipc/VideoBridgeChild.cpp b/gfx/layers/ipc/VideoBridgeChild.cpp
new file mode 100644
index 0000000000..c2d5f2ec25
--- /dev/null
+++ b/gfx/layers/ipc/VideoBridgeChild.cpp
@@ -0,0 +1,188 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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 "VideoBridgeChild.h"
+#include "VideoBridgeParent.h"
+#include "CompositorThread.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/StaticMutex.h"
+#include "transport/runnable_utils.h"
+#include "SynchronousTask.h"
+
+namespace mozilla {
+namespace layers {
+
+// Singleton
+static StaticMutex sVideoBridgeLock MOZ_UNANNOTATED;
+StaticRefPtr<VideoBridgeChild> sVideoBridge;
+
+/* static */
+void VideoBridgeChild::StartupForGPUProcess() {
+  ipc::Endpoint<PVideoBridgeParent> parentPipe;
+  ipc::Endpoint<PVideoBridgeChild> childPipe;
+
+  PVideoBridge::CreateEndpoints(base::GetCurrentProcId(),
+                                base::GetCurrentProcId(), &parentPipe,
+                                &childPipe);
+
+  VideoBridgeChild::Open(std::move(childPipe));
+  VideoBridgeParent::Open(std::move(parentPipe), VideoBridgeSource::GpuProcess);
+}
+
+/* static */
+void VideoBridgeChild::Open(Endpoint<PVideoBridgeChild>&& aEndpoint) {
+  StaticMutexAutoLock lock(sVideoBridgeLock);
+  MOZ_ASSERT(!sVideoBridge || !sVideoBridge->CanSend());
+  sVideoBridge = new VideoBridgeChild();
+
+  if (!aEndpoint.Bind(sVideoBridge)) {
+    // We can't recover from this.
+    MOZ_CRASH("Failed to bind VideoBridgeChild to endpoint");
+  }
+}
+
+/* static */
+void VideoBridgeChild::Shutdown() {
+  StaticMutexAutoLock lock(sVideoBridgeLock);
+  if (sVideoBridge) {
+    sVideoBridge->Close();
+    sVideoBridge = nullptr;
+  }
+}
+
+VideoBridgeChild::VideoBridgeChild()
+    : mThread(GetCurrentSerialEventTarget()), mCanSend(true) {}
+
+VideoBridgeChild::~VideoBridgeChild() = default;
+
+VideoBridgeChild* VideoBridgeChild::GetSingleton() {
+  StaticMutexAutoLock lock(sVideoBridgeLock);
+  return sVideoBridge;
+}
+
+bool VideoBridgeChild::AllocUnsafeShmem(size_t aSize, ipc::Shmem* aShmem) {
+  if (!mThread->IsOnCurrentThread()) {
+    return DispatchAllocShmemInternal(aSize, aShmem, true);  // true: unsafe
+  }
+
+  if (!CanSend()) {
+    return false;
+  }
+
+  return PVideoBridgeChild::AllocUnsafeShmem(aSize, aShmem);
+}
+
+bool VideoBridgeChild::AllocShmem(size_t aSize, ipc::Shmem* aShmem) {
+  MOZ_ASSERT(CanSend());
+  return PVideoBridgeChild::AllocShmem(aSize, aShmem);
+}
+
+void VideoBridgeChild::ProxyAllocShmemNow(SynchronousTask* aTask, size_t aSize,
+                                          ipc::Shmem* aShmem, bool aUnsafe,
+                                          bool* aSuccess) {
+  AutoCompleteTask complete(aTask);
+
+  if (!CanSend()) {
+    return;
+  }
+
+  bool ok = false;
+  if (aUnsafe) {
+    ok = AllocUnsafeShmem(aSize, aShmem);
+  } else {
+    ok = AllocShmem(aSize, aShmem);
+  }
+  *aSuccess = ok;
+}
+
+bool VideoBridgeChild::DispatchAllocShmemInternal(size_t aSize,
+                                                  ipc::Shmem* aShmem,
+                                                  bool aUnsafe) {
+  SynchronousTask task("AllocatorProxy alloc");
+
+  bool success = false;
+  RefPtr<Runnable> runnable = WrapRunnable(
+      RefPtr<VideoBridgeChild>(this), &VideoBridgeChild::ProxyAllocShmemNow,
+      &task, aSize, aShmem, aUnsafe, &success);
+  GetThread()->Dispatch(runnable.forget());
+
+  task.Wait();
+
+  return success;
+}
+
+void VideoBridgeChild::ProxyDeallocShmemNow(SynchronousTask* aTask,
+                                            ipc::Shmem* aShmem, bool* aResult) {
+  AutoCompleteTask complete(aTask);
+
+  if (!CanSend()) {
+    return;
+  }
+  *aResult = DeallocShmem(*aShmem);
+}
+
+bool VideoBridgeChild::DeallocShmem(ipc::Shmem& aShmem) {
+  if (GetThread()->IsOnCurrentThread()) {
+    if (!CanSend()) {
+      return false;
+    }
+    return PVideoBridgeChild::DeallocShmem(aShmem);
+  }
+
+  SynchronousTask task("AllocatorProxy Dealloc");
+  bool result = false;
+
+  RefPtr<Runnable> runnable = WrapRunnable(
+      RefPtr<VideoBridgeChild>(this), &VideoBridgeChild::ProxyDeallocShmemNow,
+      &task, &aShmem, &result);
+  GetThread()->Dispatch(runnable.forget());
+
+  task.Wait();
+  return result;
+}
+
+PTextureChild* VideoBridgeChild::AllocPTextureChild(
+    const SurfaceDescriptor&, ReadLockDescriptor&, const LayersBackend&,
+    const TextureFlags&, const dom::ContentParentId& aContentId,
+    const uint64_t& aSerial) {
+  MOZ_ASSERT(CanSend());
+  return TextureClient::CreateIPDLActor();
+}
+
+bool VideoBridgeChild::DeallocPTextureChild(PTextureChild* actor) {
+  return TextureClient::DestroyIPDLActor(actor);
+}
+
+void VideoBridgeChild::ActorDestroy(ActorDestroyReason aWhy) {
+  mCanSend = false;
+}
+
+PTextureChild* VideoBridgeChild::CreateTexture(
+    const SurfaceDescriptor& aSharedData, ReadLockDescriptor&& aReadLock,
+    LayersBackend aLayersBackend, TextureFlags aFlags,
+    const dom::ContentParentId& aContentId, uint64_t aSerial,
+    wr::MaybeExternalImageId& aExternalImageId) {
+  MOZ_ASSERT(CanSend());
+  return SendPTextureConstructor(aSharedData, std::move(aReadLock),
+                                 aLayersBackend, aFlags, aContentId, aSerial);
+}
+
+bool VideoBridgeChild::IsSameProcess() const {
+  return OtherPid() == base::GetCurrentProcId();
+}
+
+void VideoBridgeChild::HandleFatalError(const char* aMsg) {
+  dom::ContentChild::FatalErrorIfNotUsingGPUProcess(aMsg, OtherPid());
+}
+
+mozilla::ipc::IPCResult VideoBridgeChild::RecvPing(PingResolver&& aResolver) {
+  aResolver(void_t{});
+  return IPC_OK();
+}
+
+}  // namespace layers
+}  // namespace mozilla