cc/resources/scoped_ui_resource.h

   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_