1 files changed, 113 insertions, 0 deletions
diff --git a/gfx/layers/ipc/KnowsCompositor.cpp b/gfx/layers/ipc/KnowsCompositor.cpp
new file mode 100644
index 0000000000..4d2ed90603
--- /dev/null
+++ b/gfx/layers/ipc/KnowsCompositor.cpp
@@ -0,0 +1,113 @@
+/* -*- 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 "KnowsCompositor.h"
+#include "mozilla/layers/ImageDataSerializer.h"
+#include "mozilla/layers/ImageBridgeChild.h"
+#include "mozilla/ipc/ProtocolUtils.h"
+
+namespace mozilla {
+namespace layers {
+
+void KnowsCompositor::IdentifyTextureHost(
+    const TextureFactoryIdentifier& aIdentifier) {
+  auto lock = mData.Lock();
+  lock.ref().mTextureFactoryIdentifier = aIdentifier;
+
+  lock.ref().mSyncObject =
+      SyncObjectClient::CreateSyncObjectClientForContentDevice(
+          aIdentifier.mSyncHandle);
+}
+
+KnowsCompositor::KnowsCompositor()
+    : mData("KnowsCompositorMutex"), mSerial(++sSerialCounter) {}
+
+KnowsCompositor::~KnowsCompositor() = default;
+
+KnowsCompositorMediaProxy::KnowsCompositorMediaProxy(
+    const TextureFactoryIdentifier& aIdentifier) {
+  auto lock = mData.Lock();
+  lock.ref().mTextureFactoryIdentifier = aIdentifier;
+  // overwrite mSerial's value set by the parent class because we use the same
+  // serial as the KnowsCompositor we are proxying.
+  mThreadSafeAllocator = ImageBridgeChild::GetSingleton();
+  lock.ref().mSyncObject = mThreadSafeAllocator->GetSyncObject();
+}
+
+KnowsCompositorMediaProxy::~KnowsCompositorMediaProxy() = default;
+
+TextureForwarder* KnowsCompositorMediaProxy::GetTextureForwarder() {
+  return mThreadSafeAllocator->GetTextureForwarder();
+}
+
+LayersIPCActor* KnowsCompositorMediaProxy::GetLayersIPCActor() {
+  return mThreadSafeAllocator->GetLayersIPCActor();
+}
+
+ActiveResourceTracker* KnowsCompositorMediaProxy::GetActiveResourceTracker() {
+  return mThreadSafeAllocator->GetActiveResourceTracker();
+}
+
+void KnowsCompositorMediaProxy::SyncWithCompositor() {
+  mThreadSafeAllocator->SyncWithCompositor();
+}
+
+bool IsSurfaceDescriptorValid(const SurfaceDescriptor& aSurface) {
+  return aSurface.type() != SurfaceDescriptor::T__None &&
+         aSurface.type() != SurfaceDescriptor::Tnull_t;
+}
+
+uint8_t* GetAddressFromDescriptor(const SurfaceDescriptor& aDescriptor) {
+  MOZ_ASSERT(IsSurfaceDescriptorValid(aDescriptor));
+  MOZ_RELEASE_ASSERT(
+      aDescriptor.type() == SurfaceDescriptor::TSurfaceDescriptorBuffer,
+      "GFX: surface descriptor is not the right type.");
+
+  auto memOrShmem = aDescriptor.get_SurfaceDescriptorBuffer().data();
+  if (memOrShmem.type() == MemoryOrShmem::TShmem) {
+    return memOrShmem.get_Shmem().get<uint8_t>();
+  } else {
+    return reinterpret_cast<uint8_t*>(memOrShmem.get_uintptr_t());
+  }
+}
+
+already_AddRefed<gfx::DataSourceSurface> GetSurfaceForDescriptor(
+    const SurfaceDescriptor& aDescriptor) {
+  if (aDescriptor.type() != SurfaceDescriptor::TSurfaceDescriptorBuffer) {
+    return nullptr;
+  }
+  uint8_t* data = GetAddressFromDescriptor(aDescriptor);
+  auto rgb =
+      aDescriptor.get_SurfaceDescriptorBuffer().desc().get_RGBDescriptor();
+  uint32_t stride = ImageDataSerializer::GetRGBStride(rgb);
+  return gfx::Factory::CreateWrappingDataSourceSurface(data, stride, rgb.size(),
+                                                       rgb.format());
+}
+
+void DestroySurfaceDescriptor(ipc::IShmemAllocator* aAllocator,
+                              SurfaceDescriptor* aSurface) {
+  MOZ_ASSERT(aSurface);
+
+  SurfaceDescriptorBuffer& desc = aSurface->get_SurfaceDescriptorBuffer();
+  switch (desc.data().type()) {
+    case MemoryOrShmem::TShmem: {
+      aAllocator->DeallocShmem(desc.data().get_Shmem());
+      break;
+    }
+    case MemoryOrShmem::Tuintptr_t: {
+      uint8_t* ptr = (uint8_t*)desc.data().get_uintptr_t();
+      GfxMemoryImageReporter::WillFree(ptr);
+      delete[] ptr;
+      break;
+    }
+    default:
+      MOZ_CRASH("surface type not implemented!");
+  }
+  *aSurface = SurfaceDescriptor();
+}
+
+}  // namespace layers
+}  // namespace mozilla