Refactor BufferData class into a separate file to be later used by individual gbm_bo's in EGLImage.

ui/ozone/platform/dri/buffer_data.h

+// Copyright 2014 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 UI_OZONE_PLATFORM_DRI_BUFFER_DATA_H_
+#define UI_OZONE_PLATFORM_DRI_BUFFER_DATA_H_
+
+#include "base/memory/scoped_ptr.h"
+
+struct gbm_bo;
+
+namespace ui {
+
+class DriWrapper;
+
+// This class is used to tag a gbm buffer with custom information needed
+// for presentation with the surface factory.
+class BufferData {
+ public:
+  // When we create the BufferData we need to register the buffer. Once
+  // successfully registered, the |framebuffer_| field will hold the ID of the
+  // buffer. The controller will use this ID when scanning out the buffer. On
+  // creation we will also associate the BufferData with the buffer.
+  static BufferData* CreateData(DriWrapper* dri, gbm_bo* buffer);
+
+  // Callback used by GBM to destroy the BufferData associated with a buffer.
+  static void Destroy(gbm_bo* buffer, void* data);
+
+  // Returns the BufferData associated with |buffer|. NULL if no data is
+  // associated.
+  static BufferData* GetData(gbm_bo* buffer);
+
+  uint32_t framebuffer() const { return framebuffer_; }
+  uint32_t handle() const { return handle_; }
+
+ private:
+  BufferData(DriWrapper* dri, gbm_bo* buffer);
+  ~BufferData();
+
+  DriWrapper* dri_;
+
+  uint32_t handle_;
+
+  // ID provided by the controller when the buffer is registered. This ID is
+  // used when scanning out the buffer.
+  uint32_t framebuffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(BufferData);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRI_BUFFER_DATA_H_