From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 gfx/layers/ipc/TextureForwarder.h | 79 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 gfx/layers/ipc/TextureForwarder.h

(limited to 'gfx/layers/ipc/TextureForwarder.h')

diff --git a/gfx/layers/ipc/TextureForwarder.h b/gfx/layers/ipc/TextureForwarder.h
new file mode 100644
index 000000000..0d06fa5f5
--- /dev/null
+++ b/gfx/layers/ipc/TextureForwarder.h
@@ -0,0 +1,79 @@
+/* -*- 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_TEXTUREFORWARDER
+#define MOZILLA_LAYERS_TEXTUREFORWARDER
+
+#include <stdint.h>                     // for int32_t, uint64_t
+#include "gfxTypes.h"
+#include "mozilla/layers/LayersTypes.h"  // for LayersBackend
+#include "mozilla/layers/TextureClient.h"  // for TextureClient
+#include "mozilla/layers/KnowsCompositor.h"
+
+namespace mozilla {
+namespace ipc {
+class IShmemAllocator;
+}
+namespace layers {
+
+/**
+ * An abstract interface for classes that implement the autogenerated
+ * IPDL actor class. Lets us check if they are still valid for IPC.
+ */
+class LayersIPCActor {
+public:
+  virtual bool IPCOpen() const { return true; }
+};
+
+/**
+ * An abstract interface for LayersIPCActors that implement a top-level
+ * IPDL protocol so also have their own channel.
+ * Has their own MessageLoop for message dispatch, and can allocate
+ * shmem.
+ */
+class LayersIPCChannel : public LayersIPCActor
+                       , public mozilla::ipc::IShmemAllocator {
+public:
+  NS_IMETHOD_(MozExternalRefCountType) AddRef(void) = 0;
+  NS_IMETHOD_(MozExternalRefCountType) Release(void) = 0;
+
+  virtual bool IsSameProcess() const = 0;
+
+  virtual bool UsesImageBridge() const { return false; }
+
+  virtual base::ProcessId GetParentPid() const = 0;
+
+  virtual MessageLoop* GetMessageLoop() const = 0;
+
+  virtual FixedSizeSmallShmemSectionAllocator* GetTileLockAllocator() { return nullptr; }
+
+  virtual void CancelWaitForRecycle(uint64_t aTextureId) = 0;
+
+protected:
+  virtual ~LayersIPCChannel() {}
+};
+
+/**
+ * An abstract interface for classes that can allocate PTexture objects
+ * across IPDL. Currently a sub-class of LayersIPCChannel for simplicity
+ * since all our implementations use both, but could be independant if needed.
+ */
+class TextureForwarder : public LayersIPCChannel {
+public:
+  /**
+   * Create a TextureChild/Parent pair as as well as the TextureHost on the parent side.
+   */
+  virtual PTextureChild* CreateTexture(
+    const SurfaceDescriptor& aSharedData,
+    LayersBackend aLayersBackend,
+    TextureFlags aFlags,
+    uint64_t aSerial) = 0;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif
-- 
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