diff -r 000000000000 -r 6474c204b198 gfx/gl/SharedSurface.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/gl/SharedSurface.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,108 @@
+/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */
+/* 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/. */
+
+/* SharedSurface abstracts an actual surface (can be a GL texture, but
+ * not necessarily) that handles sharing.
+ * Its specializations are:
+ *     SharedSurface_Basic (client-side bitmap, does readback)
+ *     SharedSurface_GLTexture
+ *     SharedSurface_EGLImage
+ *     SharedSurface_ANGLEShareHandle
+ */
+
+#ifndef SHARED_SURFACE_H_
+#define SHARED_SURFACE_H_
+
+#include <stdint.h>
+#include "mozilla/Attributes.h"
+#include "GLDefs.h"
+#include "mozilla/gfx/Point.h"
+#include "SurfaceTypes.h"
+
+namespace mozilla {
+namespace gfx {
+
+class SurfaceFactory;
+
+class SharedSurface
+{
+protected:
+    const SharedSurfaceType mType;
+    const APITypeT mAPI;
+    const AttachmentType mAttachType;
+    const gfx::IntSize mSize;
+    const bool mHasAlpha;
+    bool mIsLocked;
+
+    SharedSurface(SharedSurfaceType type,
+                  APITypeT api,
+                  AttachmentType attachType,
+                  const gfx::IntSize& size,
+                  bool hasAlpha)
+        : mType(type)
+        , mAPI(api)
+        , mAttachType(attachType)
+        , mSize(size)
+        , mHasAlpha(hasAlpha)
+        , mIsLocked(false)
+    {
+    }
+
+public:
+    virtual ~SharedSurface() {
+    }
+
+    static void Copy(SharedSurface* src, SharedSurface* dest,
+                     SurfaceFactory* factory);
+
+    // This locks the SharedSurface as the production buffer for the context.
+    // This is needed by backends which use PBuffers and/or EGLSurfaces.
+    virtual void LockProd() {
+        MOZ_ASSERT(!mIsLocked);
+        LockProdImpl();
+        mIsLocked = true;
+    }
+
+    // Unlocking is harmless if we're already unlocked.
+    virtual void UnlockProd() {
+        if (!mIsLocked)
+            return;
+
+        UnlockProdImpl();
+        mIsLocked = false;
+    }
+
+    virtual void LockProdImpl() = 0;
+    virtual void UnlockProdImpl() = 0;
+
+    virtual void Fence() = 0;
+    virtual bool WaitSync() = 0;
+
+
+    SharedSurfaceType Type() const {
+        return mType;
+    }
+
+    APITypeT APIType() const {
+        return mAPI;
+    }
+
+    AttachmentType AttachType() const {
+        return mAttachType;
+    }
+
+    const gfx::IntSize& Size() const {
+        return mSize;
+    }
+
+    bool HasAlpha() const {
+        return mHasAlpha;
+    }
+};
+
+} /* namespace gfx */
+} /* namespace mozilla */
+
+#endif /* SHARED_SURFACE_H_ */