Enable accelerated compositing of web pages when using webkit compositor

content/browser/renderer_host/image_transport_client.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_IMAGE_TRANSPORT_CLIENT_H_
+#define CONTENT_BROWSER_RENDERER_HOST_IMAGE_TRANSPORT_CLIENT_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/gfx/compositor/compositor.h"
+#include "ui/gfx/surface/transport_dib.h"
+
+namespace gfx {
+class Size;
+}
+
+// This is a client for ImageTransportSurface, that handles the
+// platform-specific task of binding the transport surface to a GL texture.
+// The GL texture is allocated in the SharedResources context, and the data is
+// only valid between Acquire and Release.
+class ImageTransportClient {
+ public:
+  virtual ~ImageTransportClient() {}
+
+  // Initializes the client with the surface id. This returns the GL texture id,
+  // or 0 if error.
+  virtual unsigned int Initialize(uint64* surface_id) = 0;
+
+  // Gets the surface data into the texture.
+  virtual void Acquire() = 0;
+
+  // Releases the surface data.
+  virtual void Release() = 0;
+
+  // Returns whether the data is flipped in the Y direction.
+  virtual bool Flipped() = 0;
+
+  // Returns the shared memory handle used to transfer software data if needed.
+  // Can be a NULL handle.
+  virtual TransportDIB::Handle Handle() const = 0;
+
+  // Creates a platform-specific client.
+  static ImageTransportClient* Create(ui::SharedResources* resources,
+                                      const gfx::Size& size);
+};
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_IMAGE_TRANSPORT_CLIENT_H_
+