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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_RESOURCES_SCOPED_UI_RESOURCE_H_
      6 #define CC_RESOURCES_SCOPED_UI_RESOURCE_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "cc/base/cc_export.h"
     10 #include "cc/resources/ui_resource_bitmap.h"
     11 #include "cc/resources/ui_resource_client.h"
     12 #include "ui/gfx/size.h"
     13 
     14 namespace cc {
     15 
     16 class LayerTreeHost;
     17 
     18 // ScopedUIResource creates an UIResource from a bitmap and a LayerTreeHost.
     19 // This class holds a pointer to the host so that when the instance goes out of
     20 // scope, the created resource is deleted.  On a GetBitmap call from the
     21 // UIResource manager, ScopeUIResource always returns the reference to the
     22 // initially given bitmap regardless of whether the request was due to lost
     23 // resource or not.
     24 class CC_EXPORT ScopedUIResource : public UIResourceClient {
     25  public:
     26   static scoped_ptr<ScopedUIResource> Create(LayerTreeHost* host,
     27                                              const UIResourceBitmap& bitmap);
     28   virtual ~ScopedUIResource();
     29 
     30   // UIResourceClient implementation.
     31   virtual UIResourceBitmap GetBitmap(UIResourceId uid,
     32                                      bool resource_lost) OVERRIDE;
     33   UIResourceId id() { return id_; }
     34 
     35  protected:
     36   ScopedUIResource(LayerTreeHost* host, const UIResourceBitmap& bitmap);
     37 
     38   UIResourceBitmap bitmap_;
     39   LayerTreeHost* host_;
     40   UIResourceId id_;
     41 
     42  private:
     43   DISALLOW_COPY_AND_ASSIGN(ScopedUIResource);
     44 };
     45 
     46 }  // namespace cc
     47 
     48 #endif  // CC_RESOURCES_SCOPED_UI_RESOURCE_H_
     49