1 files changed, 90 insertions, 0 deletions
diff --git a/gfx/layers/ipc/KnowsCompositor.h b/gfx/layers/ipc/KnowsCompositor.h
new file mode 100755
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+++ b/gfx/layers/ipc/KnowsCompositor.h
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+/* -*- 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/. */
+
+#ifndef MOZILLA_LAYERS_KNOWSCOMPOSITOR
+#define MOZILLA_LAYERS_KNOWSCOMPOSITOR
+
+#include "mozilla/layers/LayersTypes.h"  // for LayersBackend
+#include "mozilla/layers/CompositorTypes.h"
+
+namespace mozilla {
+namespace layers {
+
+class SyncObject;
+class TextureForwarder;
+class LayersIPCActor;
+
+/**
+ * An abstract interface for classes that are tied to a specific Compositor across
+ * IPDL and uses TextureFactoryIdentifier to describe this Compositor.
+ */
+class KnowsCompositor {
+public:
+  NS_IMETHOD_(MozExternalRefCountType) AddRef(void) = 0;
+  NS_IMETHOD_(MozExternalRefCountType) Release(void) = 0;
+
+  KnowsCompositor();
+  ~KnowsCompositor();
+
+  void IdentifyTextureHost(const TextureFactoryIdentifier& aIdentifier);
+
+  SyncObject* GetSyncObject() { return mSyncObject; }
+
+  int32_t GetMaxTextureSize() const
+  {
+    return mTextureFactoryIdentifier.mMaxTextureSize;
+  }
+
+  /**
+   * Returns the type of backend that is used off the main thread.
+   * We only don't allow changing the backend type at runtime so this value can
+   * be queried once and will not change until Gecko is restarted.
+   */
+  LayersBackend GetCompositorBackendType() const
+  {
+    return mTextureFactoryIdentifier.mParentBackend;
+  }
+
+  bool SupportsTextureBlitting() const
+  {
+    return mTextureFactoryIdentifier.mSupportsTextureBlitting;
+  }
+
+  bool SupportsPartialUploads() const
+  {
+    return mTextureFactoryIdentifier.mSupportsPartialUploads;
+  }
+
+  bool SupportsComponentAlpha() const
+  {
+    return mTextureFactoryIdentifier.mSupportsComponentAlpha;
+  }
+
+  const TextureFactoryIdentifier& GetTextureFactoryIdentifier() const
+  {
+    return mTextureFactoryIdentifier;
+  }
+
+  int32_t GetSerial() { return mSerial; }
+
+  /**
+   * Helpers for finding other related interface. These are infallible.
+   */
+  virtual TextureForwarder* GetTextureForwarder() = 0;
+  virtual LayersIPCActor* GetLayersIPCActor() = 0;
+
+protected:
+  TextureFactoryIdentifier mTextureFactoryIdentifier;
+  RefPtr<SyncObject> mSyncObject;
+
+  const int32_t mSerial;
+  static mozilla::Atomic<int32_t> sSerialCounter;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif