UI Resource Manager

cc/resources/ui_resource_client.h

+// Copyright 2013 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 CC_RESOURCES_UI_RESOURCE_CLIENT_H_
+#define CC_RESOURCES_UI_RESOURCE_CLIENT_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+class UIResourceBitmap;
+
+typedef int UIResourceId;
+
+class CC_EXPORT UIResourceClient {
+ public:
+  // GetBitmap() will be called once soon after resource creation and then will
+  // be called afterwards whenever the GL context is lost, on the same thread
+  // that LayerTreeHost::CreateUIResource was called on.  It is only safe to
+  // delete a UIResourceClient object after DeleteUIResource has been called for
+  // all IDs associated with it.  A valid bitmap always must be returned but it
+  // doesn't need to be the same size or format as the original.
+  virtual scoped_refptr<UIResourceBitmap> GetBitmap(UIResourceId uid,
+                                                    bool resource_lost) = 0;
+  virtual ~UIResourceClient() {}

[enne (OOO), 2013/07/31 22:02:40]

Do you need to add a destructor here for what should be a pure virtual
interface?

[powei, 2013/08/01 00:05:10]

The lint-er complained that a virtual destructor is needed because this class
has a virtual function.

+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_UI_RESOURCE_CLIENT_H_